FIX: Correct tag number (oops)

UPDATE: Adds CHANGELOG
Adds navigation labels for sheet management
2024-11-15 01:07:02 +01:00 · 2024-11-15 00:59:13 +01:00 · 2024-11-11 10:36:54 +01:00 · 2024-10-31 22:43:43 +01:00 · 2024-10-31 22:43:43 +01:00 · 2024-10-31 22:43:43 +01:00
147 changed files with 9445 additions and 16847 deletions
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -14,7 +14,7 @@ jobs:
      - name: Install cargo-llvm-cov
        uses: taiki-e/install-action@cargo-llvm-cov
      - name: Generate code coverage
-        run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
+        run: cargo llvm-cov --all-features --workspace --exclude pyroncalc --exclude wasm --lcov --output-path lcov.info
      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v3
        with:
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -0,0 +1,32 @@
+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
+    # You can also specify other tool versions:
+    # nodejs: "19"
+    # rust: "1.64"
+    # golang: "1.19"
+
+# Build documentation in the "docs/" directory with Sphinx
+sphinx:
+  configuration: bindings/python/docs/conf.py
+
+# Optionally build your docs in additional formats such as PDF and ePub
+# formats:
+#    - pdf
+#    - epub
+
+# Optional but recommended, declare the Python requirements required
+# to build your documentation
+# See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
+# python:
+#    install:
+#    - requirements: docs/requirements.txt
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -0,0 +1,15 @@
+# CHANGELOG
+
+## [Unreleased]
+
+## [0.2.0] - 2024-11-06 (The HN release)
+
+### Added
+
+- Rust crate ironcalc_base
+- Rust crate ironcalc
+- Minimal Python bindings (only Linux)
+- JavaScript bindings
+- React WebApp
+
+[0.2.0]: https://github.com/IronCalc/ironcalc/releases/tag/v0.2.0
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -19,6 +19,15 @@ dependencies = [
 "cpufeatures",
 ]

+[[package]]
+name = "aho-corasick"
+version = "0.6.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81ce3d38065e618af2d7b77e10c5ad9a069859b4be3c2250f674af3840d9c8a5"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "1.1.3"
@@ -76,6 +85,12 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -242,6 +257,40 @@ dependencies = [
 "typenum",
 ]

+[[package]]
+name = "csv"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac574ff4d437a7b5ad237ef331c17ccca63c46479e5b5453eb8e10bb99a759fe"
+dependencies = [
+ "csv-core",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "csv-core"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5efa2b3d7902f4b634a20cae3c9c4e6209dc4779feb6863329607560143efa70"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "csv-sniffer"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b8e952164bb270a505d6cb6136624174c34cfb9abd16e0011f5e53058317f39"
+dependencies = [
+ "bitflags",
+ "csv",
+ "csv-core",
+ "memchr",
+ "regex 0.2.11",
+]
+
 [[package]]
 name = "deranged"
 version = "0.3.11"
@@ -299,6 +348,12 @@ dependencies = [
 "wasi",
 ]

+[[package]]
+name = "heck"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
+
 [[package]]
 name = "hmac"
 version = "0.12.1"
@@ -331,6 +386,12 @@ dependencies = [
 "cc",
 ]

+[[package]]
+name = "indoc"
+version = "2.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b248f5224d1d606005e02c97f5aa4e88eeb230488bcc03bc9ca4d7991399f2b5"
+
 [[package]]
 name = "inout"
 version = "0.1.3"
@@ -342,7 +403,7 @@ dependencies = [

 [[package]]
 name = "ironcalc"
-version = "0.1.3"
+version = "0.2.0"
 dependencies = [
 "bitcode",
 "chrono",
@@ -358,15 +419,17 @@ dependencies = [

 [[package]]
 name = "ironcalc_base"
-version = "0.1.3"
+version = "0.2.0"
 dependencies = [
 "bitcode",
 "chrono",
 "chrono-tz",
+ "csv",
+ "csv-sniffer",
 "js-sys",
 "once_cell",
 "rand",
- "regex",
+ "regex 1.10.4",
 "ryu",
 "serde",
 "serde_json",
@@ -405,6 +468,12 @@ dependencies = [
 "wasm-bindgen",
 ]

+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
 [[package]]
 name = "libc"
 version = "0.2.153"
@@ -423,6 +492,15 @@ version = "2.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c8640c5d730cb13ebd907d8d04b52f55ac9a2eec55b440c8892f40d56c76c1d"

+[[package]]
+name = "memoffset"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "488016bfae457b036d996092f6cb448677611ce4449e970ceaf42695203f218a"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.7.2"
@@ -459,7 +537,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c705f256449c60da65e11ff6626e0c16a0a0b96aaa348de61376b249bc340f41"
 dependencies = [
- "regex",
+ "regex 1.10.4",
 ]

 [[package]]
@@ -529,6 +607,12 @@ version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d231b230927b5e4ad203db57bbcbee2802f6bce620b1e4a9024a07d94e2907ec"

+[[package]]
+name = "portable-atomic"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da544ee218f0d287a911e9c99a39a8c9bc8fcad3cb8db5959940044ecfc67265"
+
 [[package]]
 name = "powerfmt"
 version = "0.2.0"
@@ -543,13 +627,86 @@ checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"

 [[package]]
 name = "proc-macro2"
-version = "1.0.79"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e835ff2298f5721608eb1a980ecaee1aef2c132bf95ecc026a11b7bf3c01c02e"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
 dependencies = [
 "unicode-ident",
 ]

+[[package]]
+name = "pyo3"
+version = "0.22.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15ee168e30649f7f234c3d49ef5a7a6cbf5134289bc46c29ff3155fa3221c225"
+dependencies = [
+ "cfg-if",
+ "indoc",
+ "libc",
+ "memoffset",
+ "once_cell",
+ "portable-atomic",
+ "pyo3-build-config",
+ "pyo3-ffi",
+ "pyo3-macros",
+ "unindent",
+]
+
+[[package]]
+name = "pyo3-build-config"
+version = "0.22.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e61cef80755fe9e46bb8a0b8f20752ca7676dcc07a5277d8b7768c6172e529b3"
+dependencies = [
+ "once_cell",
+ "target-lexicon",
+]
+
+[[package]]
+name = "pyo3-ffi"
+version = "0.22.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "67ce096073ec5405f5ee2b8b31f03a68e02aa10d5d4f565eca04acc41931fa1c"
+dependencies = [
+ "libc",
+ "pyo3-build-config",
+]
+
+[[package]]
+name = "pyo3-macros"
+version = "0.22.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2440c6d12bc8f3ae39f1e775266fa5122fd0c8891ce7520fa6048e683ad3de28"
+dependencies = [
+ "proc-macro2",
+ "pyo3-macros-backend",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "pyo3-macros-backend"
+version = "0.22.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1be962f0e06da8f8465729ea2cb71a416d2257dff56cbe40a70d3e62a93ae5d1"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "pyo3-build-config",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "pyroncalc"
+version = "0.1.2"
+dependencies = [
+ "ironcalc",
+ "pyo3",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "quote"
 version = "1.0.35"
@@ -589,16 +746,29 @@ dependencies = [
 "getrandom",
 ]

+[[package]]
+name = "regex"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9329abc99e39129fcceabd24cf5d85b4671ef7c29c50e972bc5afe32438ec384"
+dependencies = [
+ "aho-corasick 0.6.10",
+ "memchr",
+ "regex-syntax 0.5.6",
+ "thread_local",
+ "utf8-ranges",
+]
+
 [[package]]
 name = "regex"
 version = "1.10.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c117dbdfde9c8308975b6a18d71f3f385c89461f7b3fb054288ecf2a2058ba4c"
 dependencies = [
- "aho-corasick",
+ "aho-corasick 1.1.3",
 "memchr",
 "regex-automata",
- "regex-syntax",
+ "regex-syntax 0.8.3",
 ]

 [[package]]
@@ -607,9 +777,18 @@ version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "86b83b8b9847f9bf95ef68afb0b8e6cdb80f498442f5179a29fad448fcc1eaea"
 dependencies = [
- "aho-corasick",
+ "aho-corasick 1.1.3",
 "memchr",
- "regex-syntax",
+ "regex-syntax 0.8.3",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d707a4fa2637f2dca2ef9fd02225ec7661fe01a53623c1e6515b6916511f7a7"
+dependencies = [
+ "ucd-util",
 ]

 [[package]]
@@ -714,15 +893,21 @@ checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"

 [[package]]
 name = "syn"
-version = "2.0.58"
+version = "2.0.77"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44cfb93f38070beee36b3fef7d4f5a16f27751d94b187b666a5cc5e9b0d30687"
+checksum = "9f35bcdf61fd8e7be6caf75f429fdca8beb3ed76584befb503b1569faee373ed"
 dependencies = [
 "proc-macro2",
 "quote",
 "unicode-ident",
 ]

+[[package]]
+name = "target-lexicon"
+version = "0.12.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61c41af27dd6d1e27b1b16b489db798443478cef1f06a660c96db617ba5de3b1"
+
 [[package]]
 name = "thiserror"
 version = "1.0.58"
@@ -743,6 +928,15 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "thread_local"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
+dependencies = [
+ "lazy_static",
+]
+
 [[package]]
 name = "time"
 version = "0.3.34"
@@ -768,12 +962,30 @@ version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"

+[[package]]
+name = "ucd-util"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "abd2fc5d32b590614af8b0a20d837f32eca055edd0bbead59a9cfe80858be003"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"

+[[package]]
+name = "unindent"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7de7d73e1754487cb58364ee906a499937a0dfabd86bcb980fa99ec8c8fa2ce"
+
+[[package]]
+name = "utf8-ranges"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fcfc827f90e53a02eaef5e535ee14266c1d569214c6aa70133a624d8a3164ba"
+
 [[package]]
 name = "uuid"
 version = "1.8.0"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,7 @@ members = [
  "base",
  "xlsx",
  "bindings/wasm",
+  "bindings/python",
 ]

 exclude = [
--- a/20
+++ b/20
@@ -1,41 +1,53 @@
+.PHONY: lint
 lint:
 	cargo fmt -- --check
 	cargo clippy --all-targets --all-features
+	cd webapp && npm install && npm run check

+.PHONY: format
 format:
 	cargo fmt

+.PHONY: tests
 tests: lint
 	cargo test
 	./target/debug/documentation
 	cmp functions.md wiki/functions.md || exit 1
 	make remove-artifacts
-	cd bindings/wasm/ && wasm-pack build --target nodejs && node tests/test.mjs
+	# Regretabbly we need to build the wasm twice, once for the nodejs tests
+	# and a second one for the vitest.
+	cd bindings/wasm/ && wasm-pack build --target nodejs && node tests/test.mjs && make
+	cd webapp && npm run test
+	cd bindings/python && ./run_tests.sh && ./run_examples.sh

+.PHONY: remove-artifacts
 remove-artifacts:
 	rm -f xlsx/hello-calc.xlsx
 	rm -f xlsx/hello-styles.xlsx
 	rm -f xlsx/widths-and-heights.xlsx
 	rm -f functions.md

+.PHONY: clean
 clean: remove-artifacts
 	cargo clean
 	rm -r -f base/target
 	rm -r -f xlsx/target
+	rm -r -f bindings/python/target
+	rm -r -f bindings/wasm/targets
 	rm -f cargo-test-*
 	rm -f base/cargo-test-*
 	rm -f xlsx/cargo-test-*

-
+.PHONY: coverage
 coverage:
 	CARGO_INCREMENTAL=0 RUSTFLAGS='-C instrument-coverage' LLVM_PROFILE_FILE='cargo-test-%p-%m.profraw' cargo test
 	grcov . --binary-path ./target/debug/deps/ -s . -t html --branch --ignore-not-existing --ignore '../*' --ignore "/*" -o target/coverage/html

+.PHONY: update-docs
 update-docs:
 	cargo build
 	./target/debug/documentation -o wiki/functions.md

+.PHONY: docs
 docs:
 	cargo doc --no-deps
-
-.PHONY: lint format tests docs coverage all
--- a/README.md
+++ b/README.md
@@ -123,12 +123,12 @@ See https://github.com/ironcalc

 An early preview of the technology running entirely in your browser:

-https://playground.ironcalc.com
+https://app.ironcalc.com


 # Collaborators needed!. Call to action

-We don't have a vibrant community just yet. This is the very stages of the project. But if you are passionate about code with high standards and no compromises, if you are looking for a project with high impact, if you are interested in a better, more open infrastructure for spreadsheets, whether you are a developer (rust, python, TypeScript, electron/tauri/anything else native app, React, you name it), a designer (we need a logo desperately!), an Excel power user who wants features, a business looking to integrate a MIT/Apache licensed spreadsheet in your own SaaS application join us!
+We don't have a vibrant community just yet. This is the very stages of the project. But if you are passionate about code with high standards and no compromises, if you are looking for a project with high impact, if you are interested in a better, more open infrastructure for spreadsheets, whether you are a developer (rust, python, TypeScript, electron/tauri/anything else native app, React, you name it), a designer, an Excel power user who wants features, a business looking to integrate a MIT/Apache licensed spreadsheet in your own SaaS application join us!

 The best place to start will be to join or [discord channel](https://discord.gg/zZYWfh3RHJ) or send us an email at hello@ironcalc.com.

--- a/base/Cargo.toml
+++ b/base/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ironcalc_base"
-version = "0.1.3"
+version = "0.2.0"
 authors = ["Nicolás Hatcher <nicolas@theuniverse.today>"]
 edition = "2021"
 homepage = "https://www.ironcalc.com"
@@ -18,6 +18,8 @@ chrono-tz = "0.9"
 regex = "1.0"
 once_cell = "1.16.0"
 bitcode = "0.6.0"
+csv = "1.3.0"
+csv-sniffer = "0.1"

 [dev-dependencies]
 serde_json = "1.0"
--- a/base/examples/formulas_and_errors.rs
+++ b/base/examples/formulas_and_errors.rs
@@ -3,15 +3,15 @@ use ironcalc_base::{types::CellType, Model};
 fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut model = Model::new_empty("formulas-and-errors", "en", "UTC")?;
    // A1
-    model.set_user_input(0, 1, 1, "1".to_string());
+    model.set_user_input(0, 1, 1, "1".to_string())?;
    // A2
-    model.set_user_input(0, 2, 1, "2".to_string());
+    model.set_user_input(0, 2, 1, "2".to_string())?;
    // A3
-    model.set_user_input(0, 3, 1, "3".to_string());
+    model.set_user_input(0, 3, 1, "3".to_string())?;
    // B1
-    model.set_user_input(0, 1, 2, "=SUM(A1:A3)".to_string());
+    model.set_user_input(0, 1, 2, "=SUM(A1:A3)".to_string())?;
    // B2
-    model.set_user_input(0, 2, 2, "=B1/0".to_string());
+    model.set_user_input(0, 2, 2, "=B1/0".to_string())?;
    // Evaluate
    model.evaluate();

--- a/base/examples/hello_world.rs
+++ b/base/examples/hello_world.rs
@@ -3,11 +3,11 @@ use ironcalc_base::{cell::CellValue, Model};
 fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut model = Model::new_empty("hello-world", "en", "UTC")?;
    // A1
-    model.set_user_input(0, 1, 1, "Hello".to_string());
+    model.set_user_input(0, 1, 1, "Hello".to_string())?;
    // B1
-    model.set_user_input(0, 1, 2, "world!".to_string());
+    model.set_user_input(0, 1, 2, "world!".to_string())?;
    // C1
-    model.set_user_input(0, 1, 3, "=CONCAT(A1, \" \", B1".to_string());
+    model.set_user_input(0, 1, 3, "=CONCAT(A1, \" \", B1".to_string())?;
    // evaluates
    model.evaluate();

--- a/base/src/actions.rs
+++ b/base/src/actions.rs
@@ -79,12 +79,11 @@ impl Model {
        let formula_or_value = self
            .get_cell_formula(sheet, source_row, source_column)?
            .unwrap_or_else(|| source_cell.get_text(&self.workbook.shared_strings, &self.language));
-        self.set_user_input(sheet, target_row, target_column, formula_or_value);
+        self.set_user_input(sheet, target_row, target_column, formula_or_value)?;
        self.workbook
            .worksheet_mut(sheet)?
-            .set_cell_style(target_row, target_column, style);
-        self.cell_clear_all(sheet, source_row, source_column)?;
-        Ok(())
+            .set_cell_style(target_row, target_column, style)?;
+        self.cell_clear_all(sheet, source_row, source_column)
    }

    /// Inserts one or more new columns into the model at the specified index.
--- a/base/src/constants.rs
+++ b/base/src/constants.rs
@@ -2,10 +2,12 @@
 /// COLUMN_WIDTH and ROW_HEIGHT are pixel values
 /// A column width of Excel value `w` will result in `w * COLUMN_WIDTH_FACTOR` pixels
 /// Note that these constants are inlined
-pub(crate) const DEFAULT_COLUMN_WIDTH: f64 = 100.0;
-pub(crate) const DEFAULT_ROW_HEIGHT: f64 = 21.0;
+pub(crate) const DEFAULT_COLUMN_WIDTH: f64 = 125.0;
+pub(crate) const DEFAULT_ROW_HEIGHT: f64 = 28.0;
 pub(crate) const COLUMN_WIDTH_FACTOR: f64 = 12.0;
 pub(crate) const ROW_HEIGHT_FACTOR: f64 = 2.0;
+pub(crate) const DEFAULT_WINDOW_HEIGH: i64 = 600;
+pub(crate) const DEFAULT_WINDOW_WIDTH: i64 = 800;

 pub(crate) const LAST_COLUMN: i32 = 16_384;
 pub(crate) const LAST_ROW: i32 = 1_048_576;
--- a/base/src/lib.rs
+++ b/base/src/lib.rs
@@ -57,5 +57,6 @@ pub mod mock_time;

 pub use model::get_milliseconds_since_epoch;
 pub use model::Model;
-pub use user_model::UserModel;
 pub use user_model::BorderArea;
+pub use user_model::ClipboardData;
+pub use user_model::UserModel;
--- a/base/src/model.rs
+++ b/base/src/model.rs
@@ -7,19 +7,15 @@ use crate::{
    calc_result::{CalcResult, Range},
    cell::CellValue,
    constants::{self, LAST_COLUMN, LAST_ROW},
-    expressions::token::{Error, OpCompare, OpProduct, OpSum, OpUnary},
-    expressions::{
-        parser::move_formula::{move_formula, MoveContext},
-        token::get_error_by_name,
-        types::*,
-        utils::{self, is_valid_row},
-    },
    expressions::{
        parser::{
+            move_formula::{move_formula, MoveContext},
            stringify::{to_rc_format, to_string},
            Node, Parser,
        },
-        utils::is_valid_column_number,
+        token::{get_error_by_name, Error, OpCompare, OpProduct, OpSum, OpUnary},
+        types::*,
+        utils::{self, is_valid_column_number, is_valid_row},
    },
    formatter::{
        format::{format_number, parse_formatted_number},
@@ -1204,10 +1200,10 @@ impl Model {
    /// # fn main() -> Result<(), Box<dyn std::error::Error>> {
    /// let mut model = Model::new_empty("model", "en", "UTC")?;
    /// let (sheet, row, column) = (0, 1, 1);
-    /// model.set_user_input(sheet, row, column, "Hello!".to_string());
+    /// model.set_user_input(sheet, row, column, "Hello!".to_string())?;
    /// assert_eq!(model.get_cell_content(sheet, row, column)?, "Hello!".to_string());
    ///
-    /// model.update_cell_with_text(sheet, row, column, "Goodbye!");
+    /// model.update_cell_with_text(sheet, row, column, "Goodbye!")?;
    /// assert_eq!(model.get_cell_content(sheet, row, column)?, "Goodbye!".to_string());
    /// # Ok(())
    /// # }
@@ -1218,23 +1214,30 @@ impl Model {
    /// * [Model::update_cell_with_number()]
    /// * [Model::update_cell_with_bool()]
    /// * [Model::update_cell_with_formula()]
-    pub fn update_cell_with_text(&mut self, sheet: u32, row: i32, column: i32, value: &str) {
-        let style_index = self.get_cell_style_index(sheet, row, column);
+    pub fn update_cell_with_text(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        value: &str,
+    ) -> Result<(), String> {
+        let style_index = self.get_cell_style_index(sheet, row, column)?;
        let new_style_index;
        if common::value_needs_quoting(value, &self.language) {
            new_style_index = self
                .workbook
                .styles
-                .get_style_with_quote_prefix(style_index);
+                .get_style_with_quote_prefix(style_index)?;
        } else if self.workbook.styles.style_is_quote_prefix(style_index) {
            new_style_index = self
                .workbook
                .styles
-                .get_style_without_quote_prefix(style_index);
+                .get_style_without_quote_prefix(style_index)?;
        } else {
            new_style_index = style_index;
        }
-        self.set_cell_with_string(sheet, row, column, value, new_style_index);
+
+        self.set_cell_with_string(sheet, row, column, value, new_style_index)
    }

    /// Updates the value of a cell with a boolean value
@@ -1247,10 +1250,10 @@ impl Model {
    /// # fn main() -> Result<(), Box<dyn std::error::Error>> {
    /// let mut model = Model::new_empty("model", "en", "UTC")?;
    /// let (sheet, row, column) = (0, 1, 1);
-    /// model.set_user_input(sheet, row, column, "TRUE".to_string());
+    /// model.set_user_input(sheet, row, column, "TRUE".to_string())?;
    /// assert_eq!(model.get_cell_content(sheet, row, column)?, "TRUE".to_string());
    ///
-    /// model.update_cell_with_bool(sheet, row, column, false);
+    /// model.update_cell_with_bool(sheet, row, column, false)?;
    /// assert_eq!(model.get_cell_content(sheet, row, column)?, "FALSE".to_string());
    /// # Ok(())
    /// # }
@@ -1261,17 +1264,22 @@ impl Model {
    /// * [Model::update_cell_with_number()]
    /// * [Model::update_cell_with_text()]
    /// * [Model::update_cell_with_formula()]
-    pub fn update_cell_with_bool(&mut self, sheet: u32, row: i32, column: i32, value: bool) {
-        let style_index = self.get_cell_style_index(sheet, row, column);
+    pub fn update_cell_with_bool(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        value: bool,
+    ) -> Result<(), String> {
+        let style_index = self.get_cell_style_index(sheet, row, column)?;
        let new_style_index = if self.workbook.styles.style_is_quote_prefix(style_index) {
            self.workbook
                .styles
-                .get_style_without_quote_prefix(style_index)
+                .get_style_without_quote_prefix(style_index)?
        } else {
            style_index
        };
-        let worksheet = &mut self.workbook.worksheets[sheet as usize];
-        worksheet.set_cell_with_boolean(row, column, value, new_style_index);
+        self.set_cell_with_boolean(sheet, row, column, value, new_style_index)
    }

    /// Updates the value of a cell with a number
@@ -1284,10 +1292,10 @@ impl Model {
    /// # fn main() -> Result<(), Box<dyn std::error::Error>> {
    /// let mut model = Model::new_empty("model", "en", "UTC")?;
    /// let (sheet, row, column) = (0, 1, 1);
-    /// model.set_user_input(sheet, row, column, "42".to_string());
+    /// model.set_user_input(sheet, row, column, "42".to_string())?;
    /// assert_eq!(model.get_cell_content(sheet, row, column)?, "42".to_string());
    ///
-    /// model.update_cell_with_number(sheet, row, column, 23.0);
+    /// model.update_cell_with_number(sheet, row, column, 23.0)?;
    /// assert_eq!(model.get_cell_content(sheet, row, column)?, "23".to_string());
    /// # Ok(())
    /// # }
@@ -1298,17 +1306,22 @@ impl Model {
    /// * [Model::update_cell_with_text()]
    /// * [Model::update_cell_with_bool()]
    /// * [Model::update_cell_with_formula()]
-    pub fn update_cell_with_number(&mut self, sheet: u32, row: i32, column: i32, value: f64) {
-        let style_index = self.get_cell_style_index(sheet, row, column);
+    pub fn update_cell_with_number(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        value: f64,
+    ) -> Result<(), String> {
+        let style_index = self.get_cell_style_index(sheet, row, column)?;
        let new_style_index = if self.workbook.styles.style_is_quote_prefix(style_index) {
            self.workbook
                .styles
-                .get_style_without_quote_prefix(style_index)
+                .get_style_without_quote_prefix(style_index)?
        } else {
            style_index
        };
-        let worksheet = &mut self.workbook.worksheets[sheet as usize];
-        worksheet.set_cell_with_number(row, column, value, new_style_index);
+        self.set_cell_with_number(sheet, row, column, value, new_style_index)
    }

    /// Updates the formula of given cell
@@ -1322,11 +1335,11 @@ impl Model {
    /// # fn main() -> Result<(), Box<dyn std::error::Error>> {
    /// let mut model = Model::new_empty("model", "en", "UTC")?;
    /// let (sheet, row, column) = (0, 1, 1);
-    /// model.set_user_input(sheet, row, column, "=A2*2".to_string());
+    /// model.set_user_input(sheet, row, column, "=A2*2".to_string())?;
    /// model.evaluate();
    /// assert_eq!(model.get_cell_content(sheet, row, column)?, "=A2*2".to_string());
    ///
-    /// model.update_cell_with_formula(sheet, row, column, "=A3*2".to_string());
+    /// model.update_cell_with_formula(sheet, row, column, "=A3*2".to_string())?;
    /// model.evaluate();
    /// assert_eq!(model.get_cell_content(sheet, row, column)?, "=A3*2".to_string());
    /// # Ok(())
@@ -1345,12 +1358,12 @@ impl Model {
        column: i32,
        formula: String,
    ) -> Result<(), String> {
-        let mut style_index = self.get_cell_style_index(sheet, row, column);
+        let mut style_index = self.get_cell_style_index(sheet, row, column)?;
        if self.workbook.styles.style_is_quote_prefix(style_index) {
            style_index = self
                .workbook
                .styles
-                .get_style_without_quote_prefix(style_index);
+                .get_style_without_quote_prefix(style_index)?;
        }
        let formula = formula
            .strip_prefix('=')
@@ -1390,31 +1403,36 @@ impl Model {
    /// * [Model::update_cell_with_number()]
    /// * [Model::update_cell_with_bool()]
    /// * [Model::update_cell_with_text()]
-    pub fn set_user_input(&mut self, sheet: u32, row: i32, column: i32, value: String) {
+    pub fn set_user_input(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        value: String,
+    ) -> Result<(), String> {
        // If value starts with "'" then we force the style to be quote_prefix
-        let style_index = self.get_cell_style_index(sheet, row, column);
+        let style_index = self.get_cell_style_index(sheet, row, column)?;
        if let Some(new_value) = value.strip_prefix('\'') {
            // First check if it needs quoting
            let new_style = if common::value_needs_quoting(new_value, &self.language) {
                self.workbook
                    .styles
-                    .get_style_with_quote_prefix(style_index)
+                    .get_style_with_quote_prefix(style_index)?
            } else {
                style_index
            };
-            self.set_cell_with_string(sheet, row, column, new_value, new_style);
+            self.set_cell_with_string(sheet, row, column, new_value, new_style)?;
        } else {
            let mut new_style_index = style_index;
            if self.workbook.styles.style_is_quote_prefix(style_index) {
                new_style_index = self
                    .workbook
                    .styles
-                    .get_style_without_quote_prefix(style_index);
+                    .get_style_without_quote_prefix(style_index)?;
            }
            if let Some(formula) = value.strip_prefix('=') {
-                let formula_index = self
-                    .set_cell_with_formula(sheet, row, column, formula, new_style_index)
-                    .expect("could not set the cell formula");
+                let formula_index =
+                    self.set_cell_with_formula(sheet, row, column, formula, new_style_index)?;
                // Update the style if needed
                let cell = CellReferenceIndex { sheet, row, column };
                let parsed_formula = &self.parsed_formulas[sheet as usize][formula_index as usize];
@@ -1422,15 +1440,11 @@ impl Model {
                    let new_style_index = self
                        .workbook
                        .styles
-                        .get_style_with_format(new_style_index, &units.get_num_fmt());
-                    let style = self.workbook.styles.get_style(new_style_index);
-                    self.set_cell_style(sheet, row, column, &style)
-                        .expect("Failed setting the style");
+                        .get_style_with_format(new_style_index, &units.get_num_fmt())?;
+                    let style = self.workbook.styles.get_style(new_style_index)?;
+                    self.set_cell_style(sheet, row, column, &style)?
                }
            } else {
-                let worksheets = &mut self.workbook.worksheets;
-                let worksheet = &mut worksheets[sheet as usize];
-
                // The list of currencies is '$', '€' and the local currency
                let mut currencies = vec!["$", "€"];
                let currency = &self.locale.currency.symbol;
@@ -1443,35 +1457,39 @@ impl Model {
                        // Should not apply the format in the following cases:
                        // - we assign a date to already date-formatted cell
                        let should_apply_format = !(is_likely_date_number_format(
-                            &self.workbook.styles.get_style(new_style_index).num_fmt,
+                            &self.workbook.styles.get_style(new_style_index)?.num_fmt,
                        ) && is_likely_date_number_format(&num_fmt));
                        if should_apply_format {
                            new_style_index = self
                                .workbook
                                .styles
-                                .get_style_with_format(new_style_index, &num_fmt);
+                                .get_style_with_format(new_style_index, &num_fmt)?;
                        }
                    }
-                    worksheet.set_cell_with_number(row, column, v, new_style_index);
-                    return;
+                    let worksheet = self.workbook.worksheet_mut(sheet)?;
+                    worksheet.set_cell_with_number(row, column, v, new_style_index)?;
+                    return Ok(());
                }
                // We try to parse as boolean
                if let Ok(v) = value.to_lowercase().parse::<bool>() {
-                    worksheet.set_cell_with_boolean(row, column, v, new_style_index);
-                    return;
+                    let worksheet = self.workbook.worksheet_mut(sheet)?;
+                    worksheet.set_cell_with_boolean(row, column, v, new_style_index)?;
+                    return Ok(());
                }
                // Check is it is error value
                let upper = value.to_uppercase();
+                let worksheet = self.workbook.worksheet_mut(sheet)?;
                match get_error_by_name(&upper, &self.language) {
                    Some(error) => {
-                        worksheet.set_cell_with_error(row, column, error, new_style_index);
+                        worksheet.set_cell_with_error(row, column, error, new_style_index)?;
                    }
                    None => {
-                        self.set_cell_with_string(sheet, row, column, &value, new_style_index);
+                        self.set_cell_with_string(sheet, row, column, &value, new_style_index)?;
                    }
                }
            }
        }
+        Ok(())
    }

    fn set_cell_with_formula(
@@ -1512,24 +1530,66 @@ impl Model {
            self.parsed_formulas[sheet as usize].push(parsed_formula);
            formula_index = (shared_formulas.len() as i32) - 1;
        }
-        worksheet.set_cell_with_formula(row, column, formula_index, style);
+        worksheet.set_cell_with_formula(row, column, formula_index, style)?;
        Ok(formula_index)
    }

-    fn set_cell_with_string(&mut self, sheet: u32, row: i32, column: i32, value: &str, style: i32) {
-        let worksheets = &mut self.workbook.worksheets;
-        let worksheet = &mut worksheets[sheet as usize];
+    fn set_cell_with_string(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        value: &str,
+        style: i32,
+    ) -> Result<(), String> {
        match self.shared_strings.get(value) {
            Some(string_index) => {
-                worksheet.set_cell_with_string(row, column, *string_index as i32, style);
+                self.workbook.worksheet_mut(sheet)?.set_cell_with_string(
+                    row,
+                    column,
+                    *string_index as i32,
+                    style,
+                )?;
            }
            None => {
                let string_index = self.workbook.shared_strings.len();
                self.workbook.shared_strings.push(value.to_string());
                self.shared_strings.insert(value.to_string(), string_index);
-                worksheet.set_cell_with_string(row, column, string_index as i32, style);
+                self.workbook.worksheet_mut(sheet)?.set_cell_with_string(
+                    row,
+                    column,
+                    string_index as i32,
+                    style,
+                )?;
            }
        }
+        Ok(())
+    }
+
+    fn set_cell_with_boolean(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        value: bool,
+        style: i32,
+    ) -> Result<(), String> {
+        self.workbook
+            .worksheet_mut(sheet)?
+            .set_cell_with_boolean(row, column, value, style)
+    }
+
+    fn set_cell_with_number(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        value: f64,
+        style: i32,
+    ) -> Result<(), String> {
+        self.workbook
+            .worksheet_mut(sheet)?
+            .set_cell_with_number(row, column, value, style)
    }

    /// Gets the Excel Value (Bool, Number, String) of a cell
@@ -1596,7 +1656,7 @@ impl Model {
    ) -> Result<String, String> {
        match self.workbook.worksheet(sheet_index)?.cell(row, column) {
            Some(cell) => {
-                let format = self.get_style_for_cell(sheet_index, row, column).num_fmt;
+                let format = self.get_style_for_cell(sheet_index, row, column)?.num_fmt;
                let formatted_value =
                    cell.formatted_value(&self.workbook.shared_strings, &self.language, |value| {
                        format_number(value, &format, &self.locale).text
@@ -1699,7 +1759,7 @@ impl Model {
    pub fn cell_clear_contents(&mut self, sheet: u32, row: i32, column: i32) -> Result<(), String> {
        self.workbook
            .worksheet_mut(sheet)?
-            .cell_clear_contents(row, column);
+            .cell_clear_contents(row, column)?;
        Ok(())
    }

@@ -1734,43 +1794,40 @@ impl Model {
    }

    /// Returns the style index for cell (`sheet`, `row`, `column`)
-    pub fn get_cell_style_index(&self, sheet: u32, row: i32, column: i32) -> i32 {
+    pub fn get_cell_style_index(&self, sheet: u32, row: i32, column: i32) -> Result<i32, String> {
        // First check the cell, then row, the column
-        let cell = self
-            .workbook
-            .worksheet(sheet)
-            .expect("Invalid sheet")
-            .cell(row, column);
+        let cell = self.workbook.worksheet(sheet)?.cell(row, column);
+
        match cell {
-            Some(cell) => cell.get_style(),
+            Some(cell) => Ok(cell.get_style()),
            None => {
-                let rows = &self.workbook.worksheets[sheet as usize].rows;
+                let rows = &self.workbook.worksheet(sheet)?.rows;
                for r in rows {
                    if r.r == row {
                        if r.custom_format {
-                            return r.s;
+                            return Ok(r.s);
                        }
                        break;
                    }
                }
-                let cols = &self.workbook.worksheets[sheet as usize].cols;
+                let cols = &self.workbook.worksheet(sheet)?.cols;
                for c in cols.iter() {
                    let min = c.min;
                    let max = c.max;
                    if column >= min && column <= max {
-                        return c.style.unwrap_or(0);
+                        return Ok(c.style.unwrap_or(0));
                    }
                }
-                0
+                Ok(0)
            }
        }
    }

    /// Returns the style for cell (`sheet`, `row`, `column`)
-    pub fn get_style_for_cell(&self, sheet: u32, row: i32, column: i32) -> Style {
-        self.workbook
-            .styles
-            .get_style(self.get_cell_style_index(sheet, row, column))
+    pub fn get_style_for_cell(&self, sheet: u32, row: i32, column: i32) -> Result<Style, String> {
+        let style_index = self.get_cell_style_index(sheet, row, column)?;
+        let style = self.workbook.styles.get_style(style_index)?;
+        Ok(style)
    }

    /// Returns an internal binary representation of the workbook
@@ -1810,7 +1867,7 @@ impl Model {
                    Some(formula) => formula,
                    None => self.get_formatted_cell_value(sheet, row, column)?,
                };
-                let style = self.get_style_for_cell(sheet, row, column);
+                let style = self.get_style_for_cell(sheet, row, column)?;
                if style.font.b {
                    cell_markup = format!("**{cell_markup}**")
                }
--- a/base/src/new_empty.rs
+++ b/base/src/new_empty.rs
@@ -4,6 +4,7 @@ use std::collections::HashMap;

 use crate::{
    calc_result::Range,
+    constants::{DEFAULT_WINDOW_HEIGH, DEFAULT_WINDOW_WIDTH},
    expressions::{
        lexer::LexerMode,
        parser::{
@@ -357,8 +358,8 @@ impl Model {
            0,
            WorkbookView {
                sheet: 0,
-                window_width: 800,
-                window_height: 600,
+                window_width: DEFAULT_WINDOW_WIDTH,
+                window_height: DEFAULT_WINDOW_HEIGH,
            },
        );

--- a/base/src/styles.rs
+++ b/base/src/styles.rs
@@ -161,26 +161,29 @@ impl Styles {

    pub fn create_named_style(&mut self, style_name: &str, style: &Style) -> Result<(), String> {
        let style_index = self.create_new_style(style);
-        self.add_named_cell_style(style_name, style_index)?;
-        Ok(())
+        self.add_named_cell_style(style_name, style_index)
    }

-    pub(crate) fn get_style_with_quote_prefix(&mut self, index: i32) -> i32 {
-        let mut style = self.get_style(index);
+    pub(crate) fn get_style_with_quote_prefix(&mut self, index: i32) -> Result<i32, String> {
+        let mut style = self.get_style(index)?;
        style.quote_prefix = true;
-        self.get_style_index_or_create(&style)
+        Ok(self.get_style_index_or_create(&style))
    }

-    pub(crate) fn get_style_with_format(&mut self, index: i32, num_fmt: &str) -> i32 {
-        let mut style = self.get_style(index);
+    pub(crate) fn get_style_with_format(
+        &mut self,
+        index: i32,
+        num_fmt: &str,
+    ) -> Result<i32, String> {
+        let mut style = self.get_style(index)?;
        style.num_fmt = num_fmt.to_string();
-        self.get_style_index_or_create(&style)
+        Ok(self.get_style_index_or_create(&style))
    }

-    pub(crate) fn get_style_without_quote_prefix(&mut self, index: i32) -> i32 {
-        let mut style = self.get_style(index);
+    pub(crate) fn get_style_without_quote_prefix(&mut self, index: i32) -> Result<i32, String> {
+        let mut style = self.get_style(index)?;
        style.quote_prefix = false;
-        self.get_style_index_or_create(&style)
+        Ok(self.get_style_index_or_create(&style))
    }

    pub(crate) fn style_is_quote_prefix(&self, index: i32) -> bool {
@@ -188,9 +191,11 @@ impl Styles {
        cell_xf.quote_prefix
    }

-    pub(crate) fn get_style(&self, index: i32) -> Style {
-        let cell_xf = &self.cell_xfs[index as usize];
-
+    pub(crate) fn get_style(&self, index: i32) -> Result<Style, String> {
+        let cell_xf = &self
+            .cell_xfs
+            .get(index as usize)
+            .ok_or("Invalid index provided".to_string())?;
        let border_id = cell_xf.border_id as usize;
        let fill_id = cell_xf.fill_id as usize;
        let font_id = cell_xf.font_id as usize;
@@ -198,14 +203,14 @@ impl Styles {
        let quote_prefix = cell_xf.quote_prefix;
        let alignment = cell_xf.alignment.clone();

-        Style {
+        Ok(Style {
            alignment,
            num_fmt: get_num_fmt(num_fmt_id, &self.num_fmts),
            fill: self.fills[fill_id].clone(),
            font: self.fonts[font_id].clone(),
            border: self.borders[border_id].clone(),
            quote_prefix,
-        }
+        })
    }
 }

@@ -221,8 +226,7 @@ impl Model {
        let style_index = self.workbook.styles.get_style_index_or_create(style);
        self.workbook
            .worksheet_mut(sheet)?
-            .set_cell_style(row, column, style_index);
-        Ok(())
+            .set_cell_style(row, column, style_index)
    }

    pub fn copy_cell_style(
@@ -237,9 +241,7 @@ impl Model {

        self.workbook
            .worksheet_mut(destination_cell.0)?
-            .set_cell_style(destination_cell.1, destination_cell.2, source_style_index);
-
-        Ok(())
+            .set_cell_style(destination_cell.1, destination_cell.2, source_style_index)
    }

    /// Sets the style "style_name" in cell
@@ -253,8 +255,7 @@ impl Model {
        let style_index = self.workbook.styles.get_style_index_by_name(style_name)?;
        self.workbook
            .worksheet_mut(sheet)?
-            .set_cell_style(row, column, style_index);
-        Ok(())
+            .set_cell_style(row, column, style_index)
    }

    pub fn set_sheet_style(&mut self, sheet: u32, style_name: &str) -> Result<(), String> {
--- a/base/src/test/mod.rs
+++ b/base/src/test/mod.rs
@@ -52,6 +52,7 @@ mod test_fn_type;
 mod test_frozen_rows_and_columns;
 mod test_get_cell_content;
 mod test_percentage;
+mod test_set_functions_error_handling;
 mod test_today;
 mod test_types;
 mod user_model;
--- a/base/src/test/test_actions.rs
+++ b/base/src/test/test_actions.rs
@@ -1,6 +1,6 @@
 #![allow(clippy::unwrap_used)]

-use crate::constants::LAST_COLUMN;
+use crate::constants::{DEFAULT_ROW_HEIGHT, LAST_COLUMN};
 use crate::model::Model;
 use crate::test::util::new_empty_model;
 use crate::types::Col;
@@ -87,7 +87,8 @@ fn test_insert_rows_styles() {
    let mut model = new_empty_model();

    assert!(
-        (21.0 - model.workbook.worksheet(0).unwrap().row_height(10).unwrap()).abs() < f64::EPSILON
+        (DEFAULT_ROW_HEIGHT - model.workbook.worksheet(0).unwrap().row_height(10).unwrap()).abs()
+            < f64::EPSILON
    );
    // sets height 42 in row 10
    model
@@ -106,7 +107,8 @@ fn test_insert_rows_styles() {

    // Row 10 has the default height
    assert!(
-        (21.0 - model.workbook.worksheet(0).unwrap().row_height(10).unwrap()).abs() < f64::EPSILON
+        (DEFAULT_ROW_HEIGHT - model.workbook.worksheet(0).unwrap().row_height(10).unwrap()).abs()
+            < f64::EPSILON
    );

    // Row 10 is now row 15
@@ -120,7 +122,8 @@ fn test_delete_rows_styles() {
    let mut model = new_empty_model();

    assert!(
-        (21.0 - model.workbook.worksheet(0).unwrap().row_height(10).unwrap()).abs() < f64::EPSILON
+        (DEFAULT_ROW_HEIGHT - model.workbook.worksheet(0).unwrap().row_height(10).unwrap()).abs()
+            < f64::EPSILON
    );
    // sets height 42 in row 10
    model
@@ -139,7 +142,8 @@ fn test_delete_rows_styles() {

    // Row 10 has the default height
    assert!(
-        (21.0 - model.workbook.worksheet(0).unwrap().row_height(10).unwrap()).abs() < f64::EPSILON
+        (DEFAULT_ROW_HEIGHT - model.workbook.worksheet(0).unwrap().row_height(10).unwrap()).abs()
+            < f64::EPSILON
    );

    // Row 10 is now row 5
--- a/base/src/test/test_column_width.rs
+++ b/base/src/test/test_column_width.rs
@@ -26,7 +26,7 @@ fn test_column_width() {
    assert!((worksheet.get_column_width(1).unwrap() - DEFAULT_COLUMN_WIDTH).abs() < f64::EPSILON);
    assert!((worksheet.get_column_width(2).unwrap() - 30.0).abs() < f64::EPSILON);
    assert!((worksheet.get_column_width(3).unwrap() - DEFAULT_COLUMN_WIDTH).abs() < f64::EPSILON);
-    assert_eq!(model.get_cell_style_index(0, 23, 2), 6);
+    assert_eq!(model.get_cell_style_index(0, 23, 2), Ok(6));
 }

 #[test]
@@ -53,7 +53,7 @@ fn test_column_width_lower_edge() {
    assert!(
        (worksheet.get_column_width(6).unwrap() - 10.0 * COLUMN_WIDTH_FACTOR).abs() < f64::EPSILON
    );
-    assert_eq!(model.get_cell_style_index(0, 23, 5), 1);
+    assert_eq!(model.get_cell_style_index(0, 23, 5), Ok(1));
 }

 #[test]
@@ -80,5 +80,5 @@ fn test_column_width_higher_edge() {
    );
    assert!((worksheet.get_column_width(16).unwrap() - 30.0).abs() < f64::EPSILON);
    assert!((worksheet.get_column_width(17).unwrap() - DEFAULT_COLUMN_WIDTH).abs() < f64::EPSILON);
-    assert_eq!(model.get_cell_style_index(0, 23, 16), 1);
+    assert_eq!(model.get_cell_style_index(0, 23, 16), Ok(1));
 }
--- a/base/src/test/test_general.rs
+++ b/base/src/test/test_general.rs
@@ -17,7 +17,9 @@ fn test_empty_model() {
 #[test]
 fn test_model_simple_evaluation() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "= 1 + 3".to_string());
+    model
+        .set_user_input(0, 1, 1, "= 1 + 3".to_string())
+        .unwrap();
    model.evaluate();
    let result = model._get_text_at(0, 1, 1);
    assert_eq!(result, *"4");
@@ -43,7 +45,7 @@ fn test_model_simple_evaluation_order() {
 #[test]
 fn test_model_invalid_formula() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "= 1 +".to_string());
+    model.set_user_input(0, 1, 1, "= 1 +".to_string()).unwrap();
    model.evaluate();
    let result = model._get_text_at(0, 1, 1);
    assert_eq!(result, *"#ERROR!");
@@ -54,8 +56,10 @@ fn test_model_invalid_formula() {
 #[test]
 fn test_model_dependencies() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "23".to_string()); // A1
-    model.set_user_input(0, 1, 2, "= A1* 2-4".to_string()); // B1
+    model.set_user_input(0, 1, 1, "23".to_string()).unwrap(); // A1
+    model
+        .set_user_input(0, 1, 2, "= A1* 2-4".to_string())
+        .unwrap(); // B1
    model.evaluate();
    let result = model._get_text_at(0, 1, 1);
    assert_eq!(result, *"23");
@@ -65,7 +69,9 @@ fn test_model_dependencies() {
    let result = model._get_formula("B1");
    assert_eq!(result, *"=A1*2-4");

-    model.set_user_input(0, 2, 1, "=SUM(A1, B1)".to_string()); // A2
+    model
+        .set_user_input(0, 2, 1, "=SUM(A1, B1)".to_string())
+        .unwrap(); // A2
    model.evaluate();
    let result = model._get_text_at(0, 2, 1);
    assert_eq!(result, *"65");
@@ -74,8 +80,10 @@ fn test_model_dependencies() {
 #[test]
 fn test_model_strings() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "Hello World".to_string());
-    model.set_user_input(0, 1, 2, "=A1".to_string());
+    model
+        .set_user_input(0, 1, 1, "Hello World".to_string())
+        .unwrap();
+    model.set_user_input(0, 1, 2, "=A1".to_string()).unwrap();
    model.evaluate();
    let result = model._get_text_at(0, 1, 1);
    assert_eq!(result, *"Hello World");
@@ -152,21 +160,35 @@ fn test_to_excel_precision_str() {
 #[test]
 fn test_booleans() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "true".to_string());
-    model.set_user_input(0, 2, 1, "TRUE".to_string());
-    model.set_user_input(0, 3, 1, "True".to_string());
-    model.set_user_input(0, 4, 1, "false".to_string());
-    model.set_user_input(0, 5, 1, "FALSE".to_string());
-    model.set_user_input(0, 6, 1, "False".to_string());
+    model.set_user_input(0, 1, 1, "true".to_string()).unwrap();
+    model.set_user_input(0, 2, 1, "TRUE".to_string()).unwrap();
+    model.set_user_input(0, 3, 1, "True".to_string()).unwrap();
+    model.set_user_input(0, 4, 1, "false".to_string()).unwrap();
+    model.set_user_input(0, 5, 1, "FALSE".to_string()).unwrap();
+    model.set_user_input(0, 6, 1, "False".to_string()).unwrap();

-    model.set_user_input(0, 1, 2, "=ISLOGICAL(A1)".to_string());
-    model.set_user_input(0, 2, 2, "=ISLOGICAL(A2)".to_string());
-    model.set_user_input(0, 3, 2, "=ISLOGICAL(A3)".to_string());
-    model.set_user_input(0, 4, 2, "=ISLOGICAL(A4)".to_string());
-    model.set_user_input(0, 5, 2, "=ISLOGICAL(A5)".to_string());
-    model.set_user_input(0, 6, 2, "=ISLOGICAL(A6)".to_string());
+    model
+        .set_user_input(0, 1, 2, "=ISLOGICAL(A1)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 2, 2, "=ISLOGICAL(A2)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 3, 2, "=ISLOGICAL(A3)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 4, 2, "=ISLOGICAL(A4)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 5, 2, "=ISLOGICAL(A5)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 6, 2, "=ISLOGICAL(A6)".to_string())
+        .unwrap();

-    model.set_user_input(0, 1, 5, "=IF(false, True, FALSe)".to_string());
+    model
+        .set_user_input(0, 1, 5, "=IF(false, True, FALSe)".to_string())
+        .unwrap();

    model.evaluate();

@@ -191,19 +213,19 @@ fn test_booleans() {
 #[test]
 fn test_set_cell_style() {
    let mut model = new_empty_model();
-    let mut style = model.get_style_for_cell(0, 1, 1);
+    let mut style = model.get_style_for_cell(0, 1, 1).unwrap();
    assert!(!style.font.b);

    style.font.b = true;
    assert!(model.set_cell_style(0, 1, 1, &style).is_ok());

-    let mut style = model.get_style_for_cell(0, 1, 1);
+    let mut style = model.get_style_for_cell(0, 1, 1).unwrap();
    assert!(style.font.b);

    style.font.b = false;
    assert!(model.set_cell_style(0, 1, 1, &style).is_ok());

-    let style = model.get_style_for_cell(0, 1, 1);
+    let style = model.get_style_for_cell(0, 1, 1).unwrap();
    assert!(!style.font.b);
 }

@@ -211,21 +233,21 @@ fn test_set_cell_style() {
 fn test_copy_cell_style() {
    let mut model = new_empty_model();

-    let mut style = model.get_style_for_cell(0, 1, 1);
+    let mut style = model.get_style_for_cell(0, 1, 1).unwrap();
    style.font.b = true;
    assert!(model.set_cell_style(0, 1, 1, &style).is_ok());

-    let mut style = model.get_style_for_cell(0, 1, 2);
+    let mut style = model.get_style_for_cell(0, 1, 2).unwrap();
    style.font.i = true;
    assert!(model.set_cell_style(0, 1, 2, &style).is_ok());

    assert!(model.copy_cell_style((0, 1, 1), (0, 1, 2)).is_ok());

-    let style = model.get_style_for_cell(0, 1, 1);
+    let style = model.get_style_for_cell(0, 1, 1).unwrap();
    assert!(style.font.b);
    assert!(!style.font.i);

-    let style = model.get_style_for_cell(0, 1, 2);
+    let style = model.get_style_for_cell(0, 1, 2).unwrap();
    assert!(style.font.b);
    assert!(!style.font.i);
 }
@@ -234,15 +256,15 @@ fn test_copy_cell_style() {
 fn test_get_cell_style_index() {
    let mut model = new_empty_model();

-    let mut style = model.get_style_for_cell(0, 1, 1);
-    let style_index = model.get_cell_style_index(0, 1, 1);
+    let mut style = model.get_style_for_cell(0, 1, 1).unwrap();
+    let style_index = model.get_cell_style_index(0, 1, 1).unwrap();
    assert_eq!(style_index, 0);
    assert!(!style.font.b);

    style.font.b = true;
    assert!(model.set_cell_style(0, 1, 1, &style).is_ok());

-    let style_index = model.get_cell_style_index(0, 1, 1);
+    let style_index = model.get_cell_style_index(0, 1, 1).unwrap();
    assert_eq!(style_index, 1);
 }

@@ -250,29 +272,29 @@ fn test_get_cell_style_index() {
 fn test_model_set_cells_with_values_styles() {
    let mut model = new_empty_model();
    // Inputs
-    model.set_user_input(0, 1, 1, "21".to_string()); // A1
-    model.set_user_input(0, 2, 1, "2".to_string()); // A2
+    model.set_user_input(0, 1, 1, "21".to_string()).unwrap(); // A1
+    model.set_user_input(0, 2, 1, "2".to_string()).unwrap(); // A2

-    let style_index = model.get_cell_style_index(0, 1, 1);
+    let style_index = model.get_cell_style_index(0, 1, 1).unwrap();
    assert_eq!(style_index, 0);
-    let mut style = model.get_style_for_cell(0, 1, 1);
+    let mut style = model.get_style_for_cell(0, 1, 1).unwrap();
    style.font.b = true;
    assert!(model.set_cell_style(0, 1, 1, &style).is_ok());
    assert!(model.set_cell_style(0, 2, 1, &style).is_ok());
-    let style_index = model.get_cell_style_index(0, 1, 1);
+    let style_index = model.get_cell_style_index(0, 1, 1).unwrap();
    assert_eq!(style_index, 1);
-    let style_index = model.get_cell_style_index(0, 2, 1);
+    let style_index = model.get_cell_style_index(0, 2, 1).unwrap();
    assert_eq!(style_index, 1);

-    model.update_cell_with_number(0, 1, 2, 1.0);
-    model.update_cell_with_number(0, 2, 1, 2.0);
+    model.update_cell_with_number(0, 1, 2, 1.0).unwrap();
+    model.update_cell_with_number(0, 2, 1, 2.0).unwrap();

    model.evaluate();

    // Styles are not modified
-    let style_index = model.get_cell_style_index(0, 1, 1);
+    let style_index = model.get_cell_style_index(0, 1, 1).unwrap();
    assert_eq!(style_index, 1);
-    let style_index = model.get_cell_style_index(0, 2, 1);
+    let style_index = model.get_cell_style_index(0, 2, 1).unwrap();
    assert_eq!(style_index, 1);
 }

@@ -280,20 +302,20 @@ fn test_model_set_cells_with_values_styles() {
 fn test_style_fmt_id() {
    let mut model = new_empty_model();

-    let mut style = model.get_style_for_cell(0, 1, 1);
+    let mut style = model.get_style_for_cell(0, 1, 1).unwrap();
    style.num_fmt = "#.##".to_string();
    assert!(model.set_cell_style(0, 1, 1, &style).is_ok());
-    let style = model.get_style_for_cell(0, 1, 1);
+    let style = model.get_style_for_cell(0, 1, 1).unwrap();
    assert_eq!(style.num_fmt, "#.##");

-    let mut style = model.get_style_for_cell(0, 10, 1);
+    let mut style = model.get_style_for_cell(0, 10, 1).unwrap();
    style.num_fmt = "$$#,##0.0000".to_string();
    assert!(model.set_cell_style(0, 10, 1, &style).is_ok());
-    let style = model.get_style_for_cell(0, 10, 1);
+    let style = model.get_style_for_cell(0, 10, 1).unwrap();
    assert_eq!(style.num_fmt, "$$#,##0.0000");

    // Make sure old style is not touched
-    let style = model.get_style_for_cell(0, 1, 1);
+    let style = model.get_style_for_cell(0, 1, 1).unwrap();
    assert_eq!(style.num_fmt, "#.##");
 }

@@ -357,9 +379,13 @@ fn set_input_autocomplete() {
    let mut model = new_empty_model();
    model._set("A1", "1");
    model._set("A2", "2");
-    model.set_user_input(0, 3, 1, "=SUM(A1:A2".to_string());
+    model
+        .set_user_input(0, 3, 1, "=SUM(A1:A2".to_string())
+        .unwrap();
    // This will fail anyway
-    model.set_user_input(0, 4, 1, "=SUM(A1*".to_string());
+    model
+        .set_user_input(0, 4, 1, "=SUM(A1*".to_string())
+        .unwrap();
    model.evaluate();

    assert_eq!(model._get_formula("A3"), "=SUM(A1:A2)");
@@ -405,7 +431,7 @@ fn test_get_formatted_cell_value() {
    model._set("A5", "123.456");

    // change A5 format
-    let mut style = model.get_style_for_cell(0, 5, 1);
+    let mut style = model.get_style_for_cell(0, 5, 1).unwrap();
    style.num_fmt = "$#,##0.00".to_string();
    model.set_cell_style(0, 5, 1, &style).unwrap();

--- a/base/src/test/test_get_cell_content.rs
+++ b/base/src/test/test_get_cell_content.rs
@@ -5,8 +5,12 @@ use crate::test::util::new_empty_model;
 #[test]
 fn test_formulas() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "$100.348".to_string());
-    model.set_user_input(0, 1, 2, "=ISNUMBER(A1)".to_string());
+    model
+        .set_user_input(0, 1, 1, "$100.348".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 1, 2, "=ISNUMBER(A1)".to_string())
+        .unwrap();

    model.evaluate();

--- a/base/src/test/test_metadata.rs
+++ b/base/src/test/test_metadata.rs
@@ -3,7 +3,7 @@ use crate::test::util::new_empty_model;
 #[test]
 fn test_metadata_new_model() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "5.5".to_string());
+    model.set_user_input(0, 1, 1, "5.5".to_string()).unwrap();
    model.evaluate();
    let metadata = &model.workbook.metadata;
    assert_eq!(metadata.application, "IronCalc Sheets");
--- a/base/src/test/test_model_is_empty_cell.rs
+++ b/base/src/test/test_model_is_empty_cell.rs
@@ -14,7 +14,9 @@ fn test_is_empty_cell_non_existing_sheet() {
 fn test_is_empty_cell() {
    let mut model = new_empty_model();
    assert!(model.is_empty_cell(0, 3, 1).unwrap());
-    model.set_user_input(0, 3, 1, "Hello World".to_string());
+    model
+        .set_user_input(0, 3, 1, "Hello World".to_string())
+        .unwrap();
    assert!(!model.is_empty_cell(0, 3, 1).unwrap());
    model.cell_clear_contents(0, 3, 1).unwrap();
    assert!(model.is_empty_cell(0, 3, 1).unwrap());
--- a/base/src/test/test_quote_prefix.rs
+++ b/base/src/test/test_quote_prefix.rs
@@ -57,12 +57,12 @@ fn test_quote_prefix_enter() {
    model._set("A2", "=ISTEXT(A1)");
    model.evaluate();
    // We introduce a value with a "quote prefix" index
-    model.set_user_input(0, 1, 3, "'=A1".to_string());
+    model.set_user_input(0, 1, 3, "'=A1".to_string()).unwrap();
    model.evaluate();
    assert_eq!(model._get_text("C1"), *"=A1");

    // But if we enter with a quote_prefix but without the "'" it won't be quote_prefix
-    model.set_user_input(0, 1, 4, "=A1".to_string());
+    model.set_user_input(0, 1, 4, "=A1".to_string()).unwrap();
    model.evaluate();
    assert_eq!(model._get_text("D1"), *"123");
 }
@@ -75,7 +75,7 @@ fn test_quote_prefix_reenter() {
    model.evaluate();
    assert_eq!(model._get_text("A2"), *"TRUE");
    // We introduce a value with a "quote prefix" index
-    model.set_user_input(0, 1, 1, "123".to_string());
+    model.set_user_input(0, 1, 1, "123".to_string()).unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A2"), *"FALSE");
 }
@@ -83,7 +83,7 @@ fn test_quote_prefix_reenter() {
 #[test]
 fn test_update_cell_quote() {
    let mut model = new_empty_model();
-    model.update_cell_with_text(0, 1, 1, "= 1 + 3");
+    model.update_cell_with_text(0, 1, 1, "= 1 + 3").unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A1"), *"= 1 + 3");
    assert!(!model._has_formula("A1"));
@@ -92,12 +92,12 @@ fn test_update_cell_quote() {
 #[test]
 fn test_update_quote_prefix_reenter() {
    let mut model = new_empty_model();
-    model.update_cell_with_text(0, 1, 1, "123");
+    model.update_cell_with_text(0, 1, 1, "123").unwrap();
    model._set("A2", "=ISTEXT(A1)");
    model.evaluate();
    assert_eq!(model._get_text("A2"), *"TRUE");
    // We reenter as a number
-    model.update_cell_with_number(0, 1, 1, 123.0);
+    model.update_cell_with_number(0, 1, 1, 123.0).unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A2"), *"FALSE");
 }
@@ -105,12 +105,12 @@ fn test_update_quote_prefix_reenter() {
 #[test]
 fn test_update_quote_prefix_reenter_bool() {
    let mut model = new_empty_model();
-    model.update_cell_with_text(0, 1, 1, "TRUE");
+    model.update_cell_with_text(0, 1, 1, "TRUE").unwrap();
    model._set("A2", "=ISTEXT(A1)");
    model.evaluate();
    assert_eq!(model._get_text("A2"), *"TRUE");
    // We enter a bool
-    model.update_cell_with_bool(0, 1, 1, true);
+    model.update_cell_with_bool(0, 1, 1, true).unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A2"), *"FALSE");
 }
@@ -118,29 +118,29 @@ fn test_update_quote_prefix_reenter_bool() {
 #[test]
 fn test_update_quote_prefix_reenter_text() {
    let mut model = new_empty_model();
-    model.update_cell_with_text(0, 1, 1, "123");
+    model.update_cell_with_text(0, 1, 1, "123").unwrap();
    model._set("A2", "=ISTEXT(A1)");
    model.evaluate();
    assert_eq!(model._get_text("A2"), *"TRUE");
-    assert!(model.get_style_for_cell(0, 1, 1).quote_prefix);
+    assert!(model.get_style_for_cell(0, 1, 1).unwrap().quote_prefix);
    // We enter a string
-    model.update_cell_with_text(0, 1, 1, "Hello");
+    model.update_cell_with_text(0, 1, 1, "Hello").unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A2"), *"TRUE");
-    assert!(!model.get_style_for_cell(0, 1, 1).quote_prefix);
+    assert!(!model.get_style_for_cell(0, 1, 1).unwrap().quote_prefix);
 }

 #[test]
 fn test_update_quote_prefix_reenter_text_2() {
    let mut model = new_empty_model();
-    model.update_cell_with_text(0, 1, 1, "123");
+    model.update_cell_with_text(0, 1, 1, "123").unwrap();
    model._set("A2", "=ISTEXT(A1)");
    model.evaluate();
    assert_eq!(model._get_text("A2"), *"TRUE");
-    assert!(model.get_style_for_cell(0, 1, 1).quote_prefix);
+    assert!(model.get_style_for_cell(0, 1, 1).unwrap().quote_prefix);
    // We enter another number
-    model.update_cell_with_text(0, 1, 1, "42");
+    model.update_cell_with_text(0, 1, 1, "42").unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A2"), *"TRUE");
-    assert!(model.get_style_for_cell(0, 1, 1).quote_prefix);
+    assert!(model.get_style_for_cell(0, 1, 1).unwrap().quote_prefix);
 }
--- a/base/src/test/test_set_functions_error_handling.rs
+++ b/base/src/test/test_set_functions_error_handling.rs
@@ -0,0 +1,449 @@
+use crate::{expressions::token, test::util::new_empty_model, types::Cell};
+
+#[test]
+fn test_update_cell_with_text() {
+    let mut model = new_empty_model();
+
+    // Below are safe inputs
+    model.set_user_input(0, 1, 1, "Hello".to_string()).unwrap();
+
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid sheet
+    let update_result = model.update_cell_with_text(1, 1, 1, "new value");
+    assert_eq!(update_result, Err("Invalid sheet index".to_string()));
+
+    // Case2 : Invalid Row
+    let update_result = model.update_cell_with_text(0, 0, 1, "new value");
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case3 : Invalid Column
+    let update_result = model.update_cell_with_text(0, 1, 1048579, "new value");
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_update_cell_with_number() {
+    let mut model = new_empty_model();
+
+    // Below are safe inputs
+    model.update_cell_with_number(0, 1, 1, 10.0).unwrap();
+
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid sheet
+    let update_result = model.update_cell_with_number(1, 1, 1, 20.0);
+    assert_eq!(update_result, Err("Invalid sheet index".to_string()));
+
+    // Case2 : Invalid Row
+    let update_result = model.update_cell_with_number(0, 0, 1, 20.0);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case3 : Invalid Column
+    let update_result = model.update_cell_with_number(0, 1, 1048579, 20.0);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_update_cell_with_bool() {
+    let mut model = new_empty_model();
+
+    // Below are safe inputs
+    model.update_cell_with_bool(0, 1, 1, true).unwrap();
+
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid sheet
+    let update_result = model.update_cell_with_bool(1, 1, 1, false);
+    assert_eq!(update_result, Err("Invalid sheet index".to_string()));
+
+    // Case2 : Invalid Row
+    let update_result = model.update_cell_with_bool(0, 0, 1, false);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case3 : Invalid Column
+    let update_result = model.update_cell_with_bool(0, 1, 1048579, false);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_update_cell_with_formula() {
+    let mut model = new_empty_model();
+
+    // Below are safe inputs
+    model.update_cell_with_number(0, 1, 1, 10.0).unwrap();
+    model
+        .update_cell_with_formula(0, 1, 2, "=A1*2".to_string())
+        .unwrap();
+
+    model.evaluate();
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid sheet
+    let update_result = model.update_cell_with_formula(1, 1, 2, "=A1*2".to_string());
+    assert_eq!(update_result, Err("Invalid sheet index".to_string()));
+
+    // Case2 : Invalid Row
+    let update_result = model.update_cell_with_formula(0, 0, 2, "=A1*2".to_string());
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case3 : Invalid Column
+    let update_result = model.update_cell_with_formula(0, 1, 1048579, "=A1*2".to_string());
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_set_user_input() {
+    let mut model = new_empty_model();
+
+    // Below are safe inputs
+    model.update_cell_with_number(0, 1, 1, 10.0).unwrap();
+    model.evaluate();
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid sheet
+    let update_result = model.set_user_input(1, 1, 2, "20.0".to_string());
+    assert_eq!(update_result, Err("Invalid sheet index".to_string()));
+
+    // Case2 : Invalid Row
+    let update_result = model.set_user_input(0, 0, 2, "20.0".to_string());
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case3 : Invalid Column
+    let update_result = model.set_user_input(0, 1, 1048579, "20.0".to_string());
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_get_style_for_cell() {
+    let mut model = new_empty_model();
+
+    // Below are safe inputs
+    model.update_cell_with_number(0, 1, 1, 10.0).unwrap();
+    model.evaluate();
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid sheet
+    let update_result = model.get_style_for_cell(1, 1, 2);
+    assert_eq!(update_result, Err("Invalid sheet index".to_string()));
+
+    // ATTENTION : get_cell_style_index tries to get cell using row and col
+    // if we invalid row or column is given, it will return index 0.
+
+    // Case2 : Invalid Row
+    let update_result = model.get_style_for_cell(0, 0, 2);
+    assert!(update_result.is_ok());
+
+    // Case3 : Invalid Column
+    let update_result = model.get_style_for_cell(0, 1, 1048579);
+    assert!(update_result.is_ok());
+}
+
+#[test]
+fn test_get_cell_style_index() {
+    let mut model = new_empty_model();
+
+    // Below are safe inputs
+    model.update_cell_with_number(0, 1, 1, 10.0).unwrap();
+    model.evaluate();
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid sheet
+    let update_result = model.get_cell_style_index(1, 1, 2);
+    assert_eq!(update_result, Err("Invalid sheet index".to_string()));
+
+    // ATTENTION : get_cell_style_index tries to get cell using row and col
+    // if we invalid row or column is given, it will return index 0.
+
+    // Case2 : Invalid Row
+    let update_result = model.get_cell_style_index(0, 0, 2);
+    assert_eq!(update_result, Ok(0));
+
+    // Case3 : Invalid Column
+    let update_result = model.get_cell_style_index(0, 1, 1048579);
+    assert_eq!(update_result, Ok(0));
+}
+
+#[test]
+fn test_worksheet_update_cell() {
+    let mut model = new_empty_model();
+
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid Row
+    let update_result =
+        model
+            .workbook
+            .worksheet_mut(0)
+            .unwrap()
+            .update_cell(0, 1, Cell::new_number(10.0, 1));
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case2 : Invalid Column
+    let update_result =
+        model
+            .workbook
+            .worksheet_mut(0)
+            .unwrap()
+            .update_cell(1, 1048579, Cell::new_number(10.0, 1));
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_worksheet_set_cell_style() {
+    let mut model = new_empty_model();
+
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid Row
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_style(0, 1, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case2 : Invalid Column
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_style(1, 1048579, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_worksheet_set_cell_with_formula() {
+    let mut model = new_empty_model();
+
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid Row
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_with_formula(0, 1, 1, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case2 : Invalid Column
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_with_formula(1, 1048579, 1, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_worksheet_set_cell_with_number() {
+    let mut model = new_empty_model();
+
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid Row
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_with_number(0, 1, 1.0, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case2 : Invalid Column
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_with_number(1, 1048579, 1.0, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_worksheet_set_cell_with_string() {
+    let mut model = new_empty_model();
+
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid Row
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_with_string(0, 1, 1, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case2 : Invalid Column
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_with_string(1, 1048579, 1, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_worksheet_set_cell_with_boolean() {
+    let mut model = new_empty_model();
+
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid Row
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_with_boolean(0, 1, true, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case2 : Invalid Column
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_with_boolean(1, 1048579, true, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_worksheet_set_cell_with_error() {
+    let mut model = new_empty_model();
+
+    // Now testing all the possible error scenarios
+
+    // Case1: Invalid Row
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_with_error(0, 1, token::Error::ERROR, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case2 : Invalid Column
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .set_cell_with_error(1, 1048579, token::Error::ERROR, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+}
+
+#[test]
+fn test_worksheet_cell_clear_contents() {
+    let mut model = new_empty_model();
+
+    model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .update_cell(1, 1, Cell::new_number(10.0, 1))
+        .unwrap();
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid Row
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .cell_clear_contents(0, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case2 : Invalid Column
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .cell_clear_contents(1, 1048579);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case3 : Valid case
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .cell_clear_contents(1, 1);
+    assert_eq!(update_result, Ok(()))
+}
+
+#[test]
+fn test_worksheet_cell_clear_contents_with_style() {
+    let mut model = new_empty_model();
+
+    model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .update_cell(1, 1, Cell::new_number(10.0, 1))
+        .unwrap();
+    // Now testing all the possible error scenarios
+
+    // Case1 : Invalid Row
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .cell_clear_contents_with_style(0, 1, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case2 : Invalid Column
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .cell_clear_contents_with_style(1, 1048579, 1);
+    assert_eq!(update_result, Err("Incorrect row or column".to_string()));
+
+    // Case3 : Valid case
+    let update_result = model
+        .workbook
+        .worksheet_mut(0)
+        .unwrap()
+        .cell_clear_contents_with_style(1, 1, 1);
+    assert_eq!(update_result, Ok(()))
+}
+
+#[test]
+fn workbook_styles_get_style_error_handling() {
+    let model = new_empty_model();
+
+    // case 1 : Invalid index
+    assert_eq!(
+        model.workbook.styles.get_style(15),
+        Err("Invalid index provided".to_string())
+    );
+}
+
+#[test]
+fn workbook_styles_get_style_without_quote_prefix_error_handling() {
+    let mut model = new_empty_model();
+
+    // case 1 : Invalid index
+    assert_eq!(
+        model.workbook.styles.get_style_without_quote_prefix(15),
+        Err("Invalid index provided".to_string())
+    );
+}
+
+#[test]
+fn workbook_styles_get_style_with_format_error_handling() {
+    let mut model = new_empty_model();
+
+    // case 1 : Invalid index
+    assert_eq!(
+        model
+            .workbook
+            .styles
+            .get_style_with_format(15, "dummy_num_format"),
+        Err("Invalid index provided".to_string())
+    );
+}
+
+#[test]
+fn workbook_styles_get_style_with_quote_prefix_handling() {
+    let mut model = new_empty_model();
+
+    // case 1 : Invalid index
+    assert_eq!(
+        model.workbook.styles.get_style_with_quote_prefix(15),
+        Err("Invalid index provided".to_string())
+    );
+}
--- a/base/src/test/test_set_user_input.rs
+++ b/base/src/test/test_set_user_input.rs
@@ -5,16 +5,28 @@ use crate::{cell::CellValue, test::util::new_empty_model};
 #[test]
 fn test_currencies() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "$100.348".to_string());
-    model.set_user_input(0, 1, 2, "=ISNUMBER(A1)".to_string());
+    model
+        .set_user_input(0, 1, 1, "$100.348".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 1, 2, "=ISNUMBER(A1)".to_string())
+        .unwrap();

-    model.set_user_input(0, 2, 1, "$ 100.348".to_string());
-    model.set_user_input(0, 2, 2, "=ISNUMBER(A2)".to_string());
+    model
+        .set_user_input(0, 2, 1, "$ 100.348".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 2, 2, "=ISNUMBER(A2)".to_string())
+        .unwrap();

-    model.set_user_input(0, 3, 1, "100$".to_string());
-    model.set_user_input(0, 3, 2, "=ISNUMBER(A3)".to_string());
+    model.set_user_input(0, 3, 1, "100$".to_string()).unwrap();
+    model
+        .set_user_input(0, 3, 2, "=ISNUMBER(A3)".to_string())
+        .unwrap();

-    model.set_user_input(0, 4, 1, "3.1415926$".to_string());
+    model
+        .set_user_input(0, 4, 1, "3.1415926$".to_string())
+        .unwrap();

    model.evaluate();

@@ -43,9 +55,9 @@ fn test_currencies() {
 #[test]
 fn scientific() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "3e-4".to_string());
-    model.set_user_input(0, 2, 1, "5e-4$".to_string());
-    model.set_user_input(0, 3, 1, "6e-4%".to_string());
+    model.set_user_input(0, 1, 1, "3e-4".to_string()).unwrap();
+    model.set_user_input(0, 2, 1, "5e-4$".to_string()).unwrap();
+    model.set_user_input(0, 3, 1, "6e-4%".to_string()).unwrap();

    model.evaluate();

@@ -61,9 +73,13 @@ fn scientific() {
 #[test]
 fn test_percentage() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 10, 1, "50%".to_string());
-    model.set_user_input(0, 10, 2, "=ISNUMBER(A10)".to_string());
-    model.set_user_input(0, 11, 1, "55.759%".to_string());
+    model.set_user_input(0, 10, 1, "50%".to_string()).unwrap();
+    model
+        .set_user_input(0, 10, 2, "=ISNUMBER(A10)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 11, 1, "55.759%".to_string())
+        .unwrap();

    model.evaluate();

@@ -81,8 +97,8 @@ fn test_percentage_ops() {
    let mut model = new_empty_model();
    model._set("A1", "5%");
    model._set("A2", "20%");
-    model.set_user_input(0, 3, 1, "=A1+A2".to_string());
-    model.set_user_input(0, 4, 1, "=A1*A2".to_string());
+    model.set_user_input(0, 3, 1, "=A1+A2".to_string()).unwrap();
+    model.set_user_input(0, 4, 1, "=A1*A2".to_string()).unwrap();

    model.evaluate();

@@ -93,11 +109,19 @@ fn test_percentage_ops() {
 #[test]
 fn test_numbers() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "1,000,000".to_string());
+    model
+        .set_user_input(0, 1, 1, "1,000,000".to_string())
+        .unwrap();

-    model.set_user_input(0, 20, 1, "50,123.549".to_string());
-    model.set_user_input(0, 21, 1, "50,12.549".to_string());
-    model.set_user_input(0, 22, 1, "1,234567".to_string());
+    model
+        .set_user_input(0, 20, 1, "50,123.549".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 21, 1, "50,12.549".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 22, 1, "1,234567".to_string())
+        .unwrap();

    model.evaluate();

@@ -131,7 +155,7 @@ fn test_numbers() {
 #[test]
 fn test_negative_numbers() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "-100".to_string());
+    model.set_user_input(0, 1, 1, "-100".to_string()).unwrap();

    model.evaluate();

@@ -144,15 +168,19 @@ fn test_negative_numbers() {
 #[test]
 fn test_negative_currencies() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "-$100".to_string());
-    model.set_user_input(0, 2, 1, "-$99.123".to_string());
+    model.set_user_input(0, 1, 1, "-$100".to_string()).unwrap();
+    model
+        .set_user_input(0, 2, 1, "-$99.123".to_string())
+        .unwrap();
    // This is valid!
-    model.set_user_input(0, 3, 1, "$-345".to_string());
+    model.set_user_input(0, 3, 1, "$-345".to_string()).unwrap();

-    model.set_user_input(0, 1, 2, "-200$".to_string());
-    model.set_user_input(0, 2, 2, "-92.689$".to_string());
+    model.set_user_input(0, 1, 2, "-200$".to_string()).unwrap();
+    model
+        .set_user_input(0, 2, 2, "-92.689$".to_string())
+        .unwrap();
    // This is valid!
-    model.set_user_input(0, 3, 2, "-22$".to_string());
+    model.set_user_input(0, 3, 2, "-22$".to_string()).unwrap();

    model.evaluate();

@@ -174,8 +202,10 @@ fn test_formulas() {
    let mut model = new_empty_model();
    model._set("A1", "$100");
    model._set("A2", "$200");
-    model.set_user_input(0, 3, 1, "=A1+A2".to_string());
-    model.set_user_input(0, 4, 1, "=SUM(A1:A3)".to_string());
+    model.set_user_input(0, 3, 1, "=A1+A2".to_string()).unwrap();
+    model
+        .set_user_input(0, 4, 1, "=SUM(A1:A3)".to_string())
+        .unwrap();

    model.evaluate();

@@ -198,9 +228,9 @@ fn test_product() {
    model._set("A2", "$5");
    model._set("A3", "4");

-    model.set_user_input(0, 1, 2, "=A1*A2".to_string());
-    model.set_user_input(0, 2, 2, "=A1*A3".to_string());
-    model.set_user_input(0, 3, 2, "=A1*3".to_string());
+    model.set_user_input(0, 1, 2, "=A1*A2".to_string()).unwrap();
+    model.set_user_input(0, 2, 2, "=A1*A3".to_string()).unwrap();
+    model.set_user_input(0, 3, 2, "=A1*3".to_string()).unwrap();

    model.evaluate();

@@ -216,10 +246,12 @@ fn test_division() {
    model._set("A2", "$5");
    model._set("A3", "4");

-    model.set_user_input(0, 1, 2, "=A1/A2".to_string());
-    model.set_user_input(0, 2, 2, "=A1/A3".to_string());
-    model.set_user_input(0, 3, 2, "=A1/2".to_string());
-    model.set_user_input(0, 4, 2, "=100/A2".to_string());
+    model.set_user_input(0, 1, 2, "=A1/A2".to_string()).unwrap();
+    model.set_user_input(0, 2, 2, "=A1/A3".to_string()).unwrap();
+    model.set_user_input(0, 3, 2, "=A1/2".to_string()).unwrap();
+    model
+        .set_user_input(0, 4, 2, "=100/A2".to_string())
+        .unwrap();

    model.evaluate();

@@ -235,54 +267,54 @@ fn test_some_complex_examples() {
    // $3.00 / 2 = $1.50
    model._set("A1", "$3.00");
    model._set("A2", "2");
-    model.set_user_input(0, 3, 1, "=A1/A2".to_string());
+    model.set_user_input(0, 3, 1, "=A1/A2".to_string()).unwrap();

    // $3 / 2 = $1
    model._set("B1", "$3");
    model._set("B2", "2");
-    model.set_user_input(0, 3, 2, "=B1/B2".to_string());
+    model.set_user_input(0, 3, 2, "=B1/B2".to_string()).unwrap();

    // $5.00 * 25% = 25% * $5.00 = $1.25
    model._set("C1", "$5.00");
    model._set("C2", "25%");
-    model.set_user_input(0, 3, 3, "=C1*C2".to_string());
-    model.set_user_input(0, 4, 3, "=C2*C1".to_string());
+    model.set_user_input(0, 3, 3, "=C1*C2".to_string()).unwrap();
+    model.set_user_input(0, 4, 3, "=C2*C1".to_string()).unwrap();

    // $5 * 75% = 75% * $5 = $1
    model._set("D1", "$5");
    model._set("D2", "75%");
-    model.set_user_input(0, 3, 4, "=D1*D2".to_string());
-    model.set_user_input(0, 4, 4, "=D2*D1".to_string());
+    model.set_user_input(0, 3, 4, "=D1*D2".to_string()).unwrap();
+    model.set_user_input(0, 4, 4, "=D2*D1".to_string()).unwrap();

    // $10 + $9.99 = $9.99 + $10 = $19.99
    model._set("E1", "$10");
    model._set("E2", "$9.99");
-    model.set_user_input(0, 3, 5, "=E1+E2".to_string());
-    model.set_user_input(0, 4, 5, "=E2+E1".to_string());
+    model.set_user_input(0, 3, 5, "=E1+E2".to_string()).unwrap();
+    model.set_user_input(0, 4, 5, "=E2+E1".to_string()).unwrap();

    // $2 * 2 = 2 * $2 = $4
    model._set("F1", "$2");
    model._set("F2", "2");
-    model.set_user_input(0, 3, 6, "=F1*F2".to_string());
-    model.set_user_input(0, 4, 6, "=F2*F1".to_string());
+    model.set_user_input(0, 3, 6, "=F1*F2".to_string()).unwrap();
+    model.set_user_input(0, 4, 6, "=F2*F1".to_string()).unwrap();

    // $2.50 * 2 = 2 * $2.50 = $5.00
    model._set("G1", "$2.50");
    model._set("G2", "2");
-    model.set_user_input(0, 3, 7, "=G1*G2".to_string());
-    model.set_user_input(0, 4, 7, "=G2*G1".to_string());
+    model.set_user_input(0, 3, 7, "=G1*G2".to_string()).unwrap();
+    model.set_user_input(0, 4, 7, "=G2*G1".to_string()).unwrap();

    // $2 * 2.5 = 2.5 * $2 = $5
    model._set("H1", "$2");
    model._set("H2", "2.5");
-    model.set_user_input(0, 3, 8, "=H1*H2".to_string());
-    model.set_user_input(0, 4, 8, "=H2*H1".to_string());
+    model.set_user_input(0, 3, 8, "=H1*H2".to_string()).unwrap();
+    model.set_user_input(0, 4, 8, "=H2*H1".to_string()).unwrap();

    // 10% * 1,000 = 1,000 * 10% = 100
    model._set("I1", "10%");
    model._set("I2", "1,000");
-    model.set_user_input(0, 3, 9, "=I1*I2".to_string());
-    model.set_user_input(0, 4, 9, "=I2*I1".to_string());
+    model.set_user_input(0, 3, 9, "=I1*I2".to_string()).unwrap();
+    model.set_user_input(0, 4, 9, "=I2*I1".to_string()).unwrap();

    model.evaluate();

@@ -320,9 +352,15 @@ fn test_financial_functions() {
    model._set("A3", "10");
    model._set("A4", "$10,000");

-    model.set_user_input(0, 5, 1, "=PMT(A2/12,A3,A4)".to_string());
-    model.set_user_input(0, 6, 1, "=PMT(A2/12,A3,A4,,1)".to_string());
-    model.set_user_input(0, 7, 1, "=PMT(0.2, 3, -200)".to_string());
+    model
+        .set_user_input(0, 5, 1, "=PMT(A2/12,A3,A4)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 6, 1, "=PMT(A2/12,A3,A4,,1)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 7, 1, "=PMT(0.2, 3, -200)".to_string())
+        .unwrap();

    model.evaluate();

@@ -339,9 +377,15 @@ fn test_sum_function() {
    model._set("A1", "$100");
    model._set("A2", "$300");

-    model.set_user_input(0, 1, 2, "=SUM(A:A)".to_string());
-    model.set_user_input(0, 2, 2, "=SUM(A1:A2)".to_string());
-    model.set_user_input(0, 3, 2, "=SUM(A1, A2, A3)".to_string());
+    model
+        .set_user_input(0, 1, 2, "=SUM(A:A)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 2, 2, "=SUM(A1:A2)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 3, 2, "=SUM(A1, A2, A3)".to_string())
+        .unwrap();

    model.evaluate();

@@ -353,7 +397,7 @@ fn test_sum_function() {
 #[test]
 fn test_number() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "3".to_string());
+    model.set_user_input(0, 1, 1, "3".to_string()).unwrap();

    model.evaluate();

@@ -367,7 +411,9 @@ fn test_number() {
 #[test]
 fn test_currencies_eur_prefix() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "€100.348".to_string());
+    model
+        .set_user_input(0, 1, 1, "€100.348".to_string())
+        .unwrap();

    model.evaluate();

@@ -381,19 +427,27 @@ fn test_currencies_eur_prefix() {
 #[test]
 fn test_currencies_eur_suffix() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "100.348€".to_string());
-    model.set_user_input(0, 2, 1, "25€".to_string());
+    model
+        .set_user_input(0, 1, 1, "100.348€".to_string())
+        .unwrap();
+    model.set_user_input(0, 2, 1, "25€".to_string()).unwrap();

    // negatives
-    model.set_user_input(0, 1, 2, "-123.348€".to_string());
-    model.set_user_input(0, 2, 2, "-42€".to_string());
+    model
+        .set_user_input(0, 1, 2, "-123.348€".to_string())
+        .unwrap();
+    model.set_user_input(0, 2, 2, "-42€".to_string()).unwrap();

    // with a space
-    model.set_user_input(0, 1, 3, "101.348 €".to_string());
-    model.set_user_input(0, 2, 3, "26 €".to_string());
+    model
+        .set_user_input(0, 1, 3, "101.348 €".to_string())
+        .unwrap();
+    model.set_user_input(0, 2, 3, "26 €".to_string()).unwrap();

-    model.set_user_input(0, 1, 4, "-12.348 €".to_string());
-    model.set_user_input(0, 2, 4, "-45 €".to_string());
+    model
+        .set_user_input(0, 1, 4, "-12.348 €".to_string())
+        .unwrap();
+    model.set_user_input(0, 2, 4, "-45 €".to_string()).unwrap();

    model.evaluate();

@@ -449,9 +503,15 @@ fn test_sum_function_eur() {
    model._set("A1", "€100");
    model._set("A2", "€300");

-    model.set_user_input(0, 1, 2, "=SUM(A:A)".to_string());
-    model.set_user_input(0, 2, 2, "=SUM(A1:A2)".to_string());
-    model.set_user_input(0, 3, 2, "=SUM(A1, A2, A3)".to_string());
+    model
+        .set_user_input(0, 1, 2, "=SUM(A:A)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 2, 2, "=SUM(A1:A2)".to_string())
+        .unwrap();
+    model
+        .set_user_input(0, 3, 2, "=SUM(A1, A2, A3)".to_string())
+        .unwrap();

    model.evaluate();

@@ -463,7 +523,9 @@ fn test_sum_function_eur() {
 #[test]
 fn input_dates() {
    let mut model = new_empty_model();
-    model.set_user_input(0, 1, 1, "3/4/2025".to_string());
+    model
+        .set_user_input(0, 1, 1, "3/4/2025".to_string())
+        .unwrap();

    model.evaluate();

@@ -474,7 +536,9 @@ fn input_dates() {
    );

    // further date assignments do not change the format
-    model.set_user_input(0, 1, 1, "08-08-2028".to_string());
+    model
+        .set_user_input(0, 1, 1, "08-08-2028".to_string())
+        .unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A1"), "8/8/2028");
 }
--- a/base/src/test/test_sheet_markup.rs
+++ b/base/src/test/test_sheet_markup.rs
@@ -14,7 +14,7 @@ fn test_sheet_markup() {
    model._set("A4", "Total");
    model._set("B4", "=SUM(B2:B3)");

-    let mut style = model.get_style_for_cell(0, 1, 1);
+    let mut style = model.get_style_for_cell(0, 1, 1).unwrap();
    style.font.b = true;
    model.set_cell_style(0, 1, 1, &style).unwrap();
    model.set_cell_style(0, 1, 2, &style).unwrap();
--- a/base/src/test/test_sheets.rs
+++ b/base/src/test/test_sheets.rs
@@ -138,14 +138,14 @@ fn test_insert_sheet() {

    // Insert the sheet at the end and check the formula
    assert!(model.insert_sheet("Bacchus", 1, None).is_ok());
-    model.set_user_input(1, 3, 1, "42".to_string());
+    model.set_user_input(1, 3, 1, "42".to_string()).unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A1"), "42");
    assert_eq!(model._get_text("A2"), "#REF!");

    // Insert a sheet in between the other two
    assert!(model.insert_sheet("Dionysus", 1, None).is_ok());
-    model.set_user_input(1, 3, 1, "111".to_string());
+    model.set_user_input(1, 3, 1, "111".to_string()).unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A1"), "42");
    assert_eq!(model._get_text("A2"), "111");
@@ -176,7 +176,7 @@ fn test_rename_sheet() {
    let mut model = new_empty_model();
    model.new_sheet();
    model._set("A1", "=NewSheet!A3");
-    model.set_user_input(1, 3, 1, "25".to_string());
+    model.set_user_input(1, 3, 1, "25".to_string()).unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A1"), "#REF!");
    assert!(model.rename_sheet("Sheet2", "NewSheet").is_ok());
@@ -189,7 +189,7 @@ fn test_rename_sheet_by_index() {
    let mut model = new_empty_model();
    model.new_sheet();
    model._set("A1", "=NewSheet!A1");
-    model.set_user_input(1, 1, 1, "25".to_string());
+    model.set_user_input(1, 1, 1, "25".to_string()).unwrap();
    model.evaluate();
    assert_eq!(model._get_text("A1"), "#REF!");
    assert!(model.rename_sheet_by_index(1, "NewSheet").is_ok());
--- a/base/src/test/test_styles.rs
+++ b/base/src/test/test_styles.rs
@@ -7,10 +7,10 @@ use crate::types::Style;
 fn test_model_set_cells_with_values_styles() {
    let mut model = new_empty_model();
    // Inputs
-    model.set_user_input(0, 1, 1, "21".to_string()); // A1
-    model.set_user_input(0, 2, 1, "42".to_string()); // A2
+    model.set_user_input(0, 1, 1, "21".to_string()).unwrap(); // A1
+    model.set_user_input(0, 2, 1, "42".to_string()).unwrap(); // A2

-    let style_base = model.get_style_for_cell(0, 1, 1);
+    let style_base = model.get_style_for_cell(0, 1, 1).unwrap();
    let mut style = style_base.clone();
    style.font.b = true;
    style.num_fmt = "#,##0.00".to_string();
@@ -19,7 +19,7 @@ fn test_model_set_cells_with_values_styles() {
    let mut style = style_base;
    style.num_fmt = "#,##0.00".to_string();
    assert!(model.set_cell_style(0, 2, 1, &style).is_ok());
-    let style: Style = model.get_style_for_cell(0, 2, 1);
+    let style: Style = model.get_style_for_cell(0, 2, 1).unwrap();
    assert_eq!(style.num_fmt, "#,##0.00".to_string());
 }

@@ -27,21 +27,21 @@ fn test_model_set_cells_with_values_styles() {
 fn test_named_styles() {
    let mut model = new_empty_model();
    model._set("A1", "42");
-    let mut style = model.get_style_for_cell(0, 1, 1);
+    let mut style = model.get_style_for_cell(0, 1, 1).unwrap();
    style.font.b = true;
    assert!(model.set_cell_style(0, 1, 1, &style).is_ok());
-    let bold_style_index = model.get_cell_style_index(0, 1, 1);
+    let bold_style_index = model.get_cell_style_index(0, 1, 1).unwrap();
    let e = model
        .workbook
        .styles
        .add_named_cell_style("bold", bold_style_index);
    assert!(e.is_ok());
    model._set("A2", "420");
-    let a2_style_index = model.get_cell_style_index(0, 2, 1);
+    let a2_style_index = model.get_cell_style_index(0, 2, 1).unwrap();
    assert!(a2_style_index != bold_style_index);
    let e = model.set_cell_style_by_name(0, 2, 1, "bold");
    assert!(e.is_ok());
-    assert_eq!(model.get_cell_style_index(0, 2, 1), bold_style_index);
+    assert_eq!(model.get_cell_style_index(0, 2, 1), Ok(bold_style_index));
 }

 #[test]
@@ -49,7 +49,7 @@ fn test_create_named_style() {
    let mut model = new_empty_model();
    model._set("A1", "42");

-    let mut style = model.get_style_for_cell(0, 1, 1);
+    let mut style = model.get_style_for_cell(0, 1, 1).unwrap();
    assert!(!style.font.b);

    style.font.b = true;
@@ -59,6 +59,6 @@ fn test_create_named_style() {
    let e = model.set_cell_style_by_name(0, 1, 1, "bold");
    assert!(e.is_ok());

-    let style = model.get_style_for_cell(0, 1, 1);
+    let style = model.get_style_for_cell(0, 1, 1).unwrap();
    assert!(style.font.b);
 }
--- a/base/src/test/test_worksheet.rs
+++ b/base/src/test/test_worksheet.rs
@@ -100,7 +100,9 @@ fn test_worksheet_dimension_progressive() {
        }
    );

-    model.set_user_input(0, 30, 50, "Hello World".to_string());
+    model
+        .set_user_input(0, 30, 50, "Hello World".to_string())
+        .unwrap();
    assert_eq!(
        model.workbook.worksheet(0).unwrap().dimension(),
        WorksheetDimension {
@@ -111,7 +113,9 @@ fn test_worksheet_dimension_progressive() {
        }
    );

-    model.set_user_input(0, 10, 15, "Hello World".to_string());
+    model
+        .set_user_input(0, 10, 15, "Hello World".to_string())
+        .unwrap();
    assert_eq!(
        model.workbook.worksheet(0).unwrap().dimension(),
        WorksheetDimension {
@@ -122,7 +126,9 @@ fn test_worksheet_dimension_progressive() {
        }
    );

-    model.set_user_input(0, 5, 25, "Hello World".to_string());
+    model
+        .set_user_input(0, 5, 25, "Hello World".to_string())
+        .unwrap();
    assert_eq!(
        model.workbook.worksheet(0).unwrap().dimension(),
        WorksheetDimension {
@@ -133,7 +139,9 @@ fn test_worksheet_dimension_progressive() {
        }
    );

-    model.set_user_input(0, 10, 250, "Hello World".to_string());
+    model
+        .set_user_input(0, 10, 250, "Hello World".to_string())
+        .unwrap();
    assert_eq!(
        model.workbook.worksheet(0).unwrap().dimension(),
        WorksheetDimension {
@@ -162,12 +170,14 @@ fn test_worksheet_navigate_to_edge_in_direction() {
    for (row_index, row) in inline_spreadsheet.into_iter().enumerate() {
        for (column_index, value) in row.into_iter().enumerate() {
            if value != 0 {
-                model.update_cell_with_number(
-                    0,
-                    (row_index as i32) + 1,
-                    (column_index as i32) + 1,
-                    value.into(),
-                );
+                model
+                    .update_cell_with_number(
+                        0,
+                        (row_index as i32) + 1,
+                        (column_index as i32) + 1,
+                        value.into(),
+                    )
+                    .unwrap();
            }
        }
    }
--- a/base/src/test/user_model/mod.rs
+++ b/base/src/test/user_model/mod.rs
@@ -1,14 +1,21 @@
 mod test_add_delete_sheets;
 mod test_autofill_columns;
 mod test_autofill_rows;
+mod test_border;
 mod test_clear_cells;
 mod test_diff_queue;
 mod test_evaluation;
 mod test_general;
 mod test_grid_lines;
+mod test_keyboard_navigation;
+mod test_on_area_selection;
+mod test_on_expand_selected_range;
+mod test_on_paste_styles;
+mod test_paste_csv;
 mod test_rename_sheet;
 mod test_row_column;
 mod test_styles;
 mod test_to_from_bytes;
 mod test_undo_redo;
 mod test_view;
+mod test_window_size;
--- a/base/src/test/user_model/test_add_delete_sheets.rs
+++ b/base/src/test/user_model/test_add_delete_sheets.rs
@@ -5,13 +5,13 @@ use crate::{constants::DEFAULT_COLUMN_WIDTH, UserModel};
 #[test]
 fn add_undo_redo() {
    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
-    model.new_sheet();
+    model.new_sheet().unwrap();
    model.set_user_input(1, 1, 1, "=1 + 1").unwrap();
    model.set_user_input(1, 1, 2, "=A1*3").unwrap();
    model
        .set_column_width(1, 5, 5.0 * DEFAULT_COLUMN_WIDTH)
        .unwrap();
-    model.new_sheet();
+    model.new_sheet().unwrap();
    model.set_user_input(2, 1, 1, "=Sheet2!B1").unwrap();

    model.undo().unwrap();
@@ -59,7 +59,7 @@ fn set_sheet_color() {
 #[test]
 fn new_sheet_propagates() {
    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
-    model.new_sheet();
+    model.new_sheet().unwrap();

    let send_queue = model.flush_send_queue();

@@ -72,7 +72,7 @@ fn new_sheet_propagates() {
 #[test]
 fn delete_sheet_propagates() {
    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
-    model.new_sheet();
+    model.new_sheet().unwrap();
    model.delete_sheet(0).unwrap();

    let send_queue = model.flush_send_queue();
@@ -82,3 +82,23 @@ fn delete_sheet_propagates() {
    let sheets_info = model2.get_worksheets_properties();
    assert_eq!(sheets_info.len(), 1);
 }
+
+#[test]
+fn delete_last_sheet() {
+    // Deleting the last sheet, selects the previous
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.new_sheet().unwrap();
+    model.new_sheet().unwrap();
+    model.set_selected_sheet(2).unwrap();
+    model.delete_sheet(2).unwrap();
+
+    assert_eq!(model.get_selected_sheet(), 1);
+}
+
+#[test]
+fn new_sheet_selects_it() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    assert_eq!(model.get_selected_sheet(), 0);
+    model.new_sheet().unwrap();
+    assert_eq!(model.get_selected_sheet(), 1);
+}
--- a/base/src/test/user_model/test_border.rs
+++ b/base/src/test/user_model/test_border.rs
@@ -0,0 +1,638 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::{
+    expressions::{types::Area, utils::number_to_column},
+    types::{Border, BorderItem, BorderStyle},
+    BorderArea, UserModel,
+};
+
+#[test]
+fn borders_all() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // We set an outer border in cells F5:H9
+    let range = &Area {
+        sheet: 0,
+        row: 5,
+        column: 6,
+        width: 3,
+        height: 4,
+    };
+    assert_eq!(number_to_column(6).unwrap(), "F");
+    assert_eq!(number_to_column(8).unwrap(), "H");
+    // ATM we don't have a way to create the object from Rust, that's ok.
+    let border_area: BorderArea = serde_json::from_str(
+        r##"{
+      "item": {
+        "style": "thin",
+        "color": "#FF5566"
+      },
+      "type": "All"
+    }"##,
+    )
+    .unwrap();
+    model.set_area_with_border(range, &border_area).unwrap();
+    for row in 5..9 {
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: Some(border_item.clone()),
+                right: Some(border_item.clone()),
+                top: Some(border_item.clone()),
+                bottom: Some(border_item.clone()),
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+
+    // let's check the borders around
+    {
+        let row = 4;
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: None,
+                bottom: Some(border_item.clone()),
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+        let row = 9;
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: Some(border_item.clone()),
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+    {
+        let column = 5;
+        for row in 5..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: Some(border_item.clone()),
+                top: None,
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+        let column = 9;
+        for row in 5..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: Some(border_item.clone()),
+                right: None,
+                top: None,
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+
+    // Lets remove all of them:
+    let border_area: BorderArea = serde_json::from_str(
+        r##"{
+      "item": {
+        "style": "thin",
+        "color": "#FF5566"
+      },
+      "type": "None"
+    }"##,
+    )
+    .unwrap();
+    model.set_area_with_border(range, &border_area).unwrap();
+    for row in 4..10 {
+        for column in 5..10 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: None,
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+}
+
+#[test]
+fn borders_inner() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // We set an outer border in cells F5:H9
+    let range = &Area {
+        sheet: 0,
+        row: 5,
+        column: 6,
+        width: 3,
+        height: 4,
+    };
+    assert_eq!(number_to_column(6).unwrap(), "F");
+    assert_eq!(number_to_column(8).unwrap(), "H");
+    // ATM we don't have a way to create the object from Rust, that's ok.
+    let border_area: BorderArea = serde_json::from_str(
+        r##"{
+      "item": {
+        "style": "thin",
+        "color": "#FF5566"
+      },
+      "type": "Inner"
+    }"##,
+    )
+    .unwrap();
+    model.set_area_with_border(range, &border_area).unwrap();
+    // The inner part all have borders
+    for row in 6..8 {
+        for column in 7..8 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: Some(border_item.clone()),
+                right: Some(border_item.clone()),
+                top: Some(border_item.clone()),
+                bottom: Some(border_item.clone()),
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+    // F5 has border only left and bottom
+    {
+        // We check the border on F5
+        let style = model.get_cell_style(0, 5, 6).unwrap();
+        let border_item = BorderItem {
+            style: BorderStyle::Thin,
+            color: Some("#FF5566".to_string()),
+        };
+        // It should be right and bottom
+        let expected_border = Border {
+            diagonal_up: false,
+            diagonal_down: false,
+            left: None,
+            right: Some(border_item.clone()),
+            top: None,
+            bottom: Some(border_item),
+            diagonal: None,
+        };
+        assert_eq!(style.border, expected_border);
+    }
+    {
+        // Then let's try the bottom-right border
+        let style = model.get_cell_style(0, 8, 8).unwrap();
+        let border_item = BorderItem {
+            style: BorderStyle::Thin,
+            color: Some("#FF5566".to_string()),
+        };
+        // It should be only left and top
+        let expected_border = Border {
+            diagonal_up: false,
+            diagonal_down: false,
+            left: Some(border_item.clone()),
+            right: None,
+            top: Some(border_item.clone()),
+            bottom: None,
+            diagonal: None,
+        };
+        assert_eq!(style.border, expected_border);
+    }
+}
+
+#[test]
+fn borders_outer() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // We set an outer border in cells F5:H9
+    let range = &Area {
+        sheet: 0,
+        row: 5,
+        column: 6,
+        width: 3,
+        height: 4,
+    };
+    assert_eq!(number_to_column(6).unwrap(), "F");
+    assert_eq!(number_to_column(8).unwrap(), "H");
+    // ATM we don't have a way to create the object from Rust, that's ok.
+    let border_area: BorderArea = serde_json::from_str(
+        r##"{
+      "item": {
+        "style": "thin",
+        "color": "#FF5566"
+      },
+      "type": "Outer"
+    }"##,
+    )
+    .unwrap();
+    model.set_area_with_border(range, &border_area).unwrap();
+    {
+        // We check the border on F5
+        let style = model.get_cell_style(0, 5, 6).unwrap();
+        let border_item = BorderItem {
+            style: BorderStyle::Thin,
+            color: Some("#FF5566".to_string()),
+        };
+        // It should be only left and top
+        let expected_border = Border {
+            diagonal_up: false,
+            diagonal_down: false,
+            left: Some(border_item.clone()),
+            right: None,
+            top: Some(border_item),
+            bottom: None,
+            diagonal: None,
+        };
+        assert_eq!(style.border, expected_border);
+    }
+    {
+        // Then let's try the bottom-right border
+        let style = model.get_cell_style(0, 8, 8).unwrap();
+        let border_item = BorderItem {
+            style: BorderStyle::Thin,
+            color: Some("#FF5566".to_string()),
+        };
+        // It should be only left and top
+        let expected_border = Border {
+            diagonal_up: false,
+            diagonal_down: false,
+            left: None,
+            right: Some(border_item.clone()),
+            top: None,
+            bottom: Some(border_item.clone()),
+            diagonal: None,
+        };
+        assert_eq!(style.border, expected_border);
+    }
+
+    // let's check the borders around
+    {
+        let row = 4;
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: None,
+                bottom: Some(border_item.clone()),
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+        let row = 9;
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: Some(border_item.clone()),
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+    {
+        let column = 5;
+        for row in 5..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: Some(border_item.clone()),
+                top: None,
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+        let column = 9;
+        for row in 5..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: Some(border_item.clone()),
+                right: None,
+                top: None,
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+}
+
+#[test]
+fn borders_top() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // We set an outer border in cells F5:H9
+    let range = &Area {
+        sheet: 0,
+        row: 5,
+        column: 6,
+        width: 3,
+        height: 4,
+    };
+    assert_eq!(number_to_column(6).unwrap(), "F");
+    assert_eq!(number_to_column(8).unwrap(), "H");
+    // ATM we don't have a way to create the object from Rust, that's ok.
+    let border_area: BorderArea = serde_json::from_str(
+        r##"{
+      "item": {
+        "style": "thin",
+        "color": "#FF5566"
+      },
+      "type": "Top"
+    }"##,
+    )
+    .unwrap();
+    model.set_area_with_border(range, &border_area).unwrap();
+    for row in 5..9 {
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: Some(border_item.clone()),
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+
+    // let's check the borders around
+    {
+        let row = 4;
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: None,
+                bottom: Some(border_item.clone()),
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+        let row = 9;
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: None,
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+    {
+        let column = 5;
+        for row in 5..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: None,
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+        let column = 9;
+        for row in 5..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: None,
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+}
+
+#[test]
+fn borders_right() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // We set an outer border in cells F5:H9
+    let range = &Area {
+        sheet: 0,
+        row: 5,
+        column: 6,
+        width: 3,
+        height: 4,
+    };
+    assert_eq!(number_to_column(6).unwrap(), "F");
+    assert_eq!(number_to_column(8).unwrap(), "H");
+    // ATM we don't have a way to create the object from Rust, that's ok.
+    let border_area: BorderArea = serde_json::from_str(
+        r##"{
+      "item": {
+        "style": "thin",
+        "color": "#FF5566"
+      },
+      "type": "Right"
+    }"##,
+    )
+    .unwrap();
+    model.set_area_with_border(range, &border_area).unwrap();
+    for row in 5..9 {
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: Some(border_item.clone()),
+                top: None,
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+}
+
+#[test]
+fn borders_bottom() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // We set an outer border in cells F5:H9
+    let range = &Area {
+        sheet: 0,
+        row: 5,
+        column: 6,
+        width: 3,
+        height: 4,
+    };
+    assert_eq!(number_to_column(6).unwrap(), "F");
+    assert_eq!(number_to_column(8).unwrap(), "H");
+    // ATM we don't have a way to create the object from Rust, that's ok.
+    let border_area: BorderArea = serde_json::from_str(
+        r##"{
+      "item": {
+        "style": "thin",
+        "color": "#FF5566"
+      },
+      "type": "Bottom"
+    }"##,
+    )
+    .unwrap();
+    model.set_area_with_border(range, &border_area).unwrap();
+    for row in 5..9 {
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: None,
+                right: None,
+                top: None,
+                bottom: Some(border_item.clone()),
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+}
+
+#[test]
+fn borders_left() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // We set an outer border in cells F5:H9
+    let range = &Area {
+        sheet: 0,
+        row: 5,
+        column: 6,
+        width: 3,
+        height: 4,
+    };
+    assert_eq!(number_to_column(6).unwrap(), "F");
+    assert_eq!(number_to_column(8).unwrap(), "H");
+    // ATM we don't have a way to create the object from Rust, that's ok.
+    let border_area: BorderArea = serde_json::from_str(
+        r##"{
+      "item": {
+        "style": "thin",
+        "color": "#FF5566"
+      },
+      "type": "Left"
+    }"##,
+    )
+    .unwrap();
+    model.set_area_with_border(range, &border_area).unwrap();
+    for row in 5..9 {
+        for column in 6..9 {
+            let style = model.get_cell_style(0, row, column).unwrap();
+            let border_item = BorderItem {
+                style: BorderStyle::Thin,
+                color: Some("#FF5566".to_string()),
+            };
+            let expected_border = Border {
+                diagonal_up: false,
+                diagonal_down: false,
+                left: Some(border_item.clone()),
+                right: None,
+                top: None,
+                bottom: None,
+                diagonal: None,
+            };
+            assert_eq!(style.border, expected_border);
+        }
+    }
+}
--- a/base/src/test/user_model/test_diff_queue.rs
+++ b/base/src/test/user_model/test_diff_queue.rs
@@ -138,7 +138,7 @@ fn queue_undo_redo_multiple() {
 #[test]
 fn new_sheet() {
    let mut model1 = UserModel::from_model(new_empty_model());
-    model1.new_sheet();
+    model1.new_sheet().unwrap();
    model1.set_user_input(0, 1, 1, "42").unwrap();
    model1.set_user_input(1, 1, 1, "=Sheet1!A1*2").unwrap();

--- a/base/src/test/user_model/test_general.rs
+++ b/base/src/test/user_model/test_general.rs
@@ -129,3 +129,12 @@ fn delete_remove_cell() {
    let (sheet, row, column) = (0, 1, 1);
    model.set_user_input(sheet, row, column, "100$").unwrap();
 }
+
+#[test]
+fn get_and_set_name() {
+    let mut model = UserModel::new_empty("MyWorkbook123", "en", "UTC").unwrap();
+    assert_eq!(model.get_name(), "MyWorkbook123");
+
+    model.set_name("Another name");
+    assert_eq!(model.get_name(), "Another name");
+}
--- a/base/src/test/user_model/test_grid_lines.rs
+++ b/base/src/test/user_model/test_grid_lines.rs
@@ -7,7 +7,7 @@ use crate::UserModel;
 fn basic_tests() {
    let model = new_empty_model();
    let mut model = UserModel::from_model(model);
-    model.new_sheet();
+    model.new_sheet().unwrap();

    // default sheet has show_grid_lines = true
    assert_eq!(model.get_show_grid_lines(0), Ok(true));
--- a/base/src/test/user_model/test_keyboard_navigation.rs
+++ b/base/src/test/user_model/test_keyboard_navigation.rs
@@ -0,0 +1,136 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::{
+    constants::{
+        DEFAULT_COLUMN_WIDTH, DEFAULT_ROW_HEIGHT, DEFAULT_WINDOW_HEIGH, DEFAULT_WINDOW_WIDTH,
+        LAST_COLUMN,
+    },
+    test::util::new_empty_model,
+    UserModel,
+};
+
+#[test]
+fn basic_navigation() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    model.on_arrow_right().unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [1, 2, 1, 2]);
+    assert_eq!(view.column, 2);
+    assert_eq!(view.row, 1);
+
+    model.on_arrow_left().unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [1, 1, 1, 1]);
+    assert_eq!(view.column, 1);
+    assert_eq!(view.row, 1);
+
+    model.on_arrow_left().unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [1, 1, 1, 1]);
+    assert_eq!(view.column, 1);
+    assert_eq!(view.row, 1);
+
+    model.on_arrow_down().unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [2, 1, 2, 1]);
+    assert_eq!(view.column, 1);
+    assert_eq!(view.row, 2);
+
+    model.on_arrow_up().unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [1, 1, 1, 1]);
+    assert_eq!(view.column, 1);
+    assert_eq!(view.row, 1);
+
+    model.on_arrow_up().unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [1, 1, 1, 1]);
+    assert_eq!(view.column, 1);
+    assert_eq!(view.row, 1);
+}
+
+#[test]
+fn scroll_right() {
+    let window_width = DEFAULT_WINDOW_WIDTH as f64;
+    let column_width = DEFAULT_COLUMN_WIDTH;
+    let column_count = f64::floor(window_width / column_width) as i32;
+
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    model.on_arrow_right().unwrap();
+
+    model.set_selected_cell(3, column_count).unwrap();
+    model.on_arrow_right().unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.left_column, 2);
+
+    model.on_arrow_right().unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.left_column, 3);
+}
+
+#[test]
+fn last_colum() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    model.set_selected_cell(3, LAST_COLUMN).unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.column, LAST_COLUMN);
+
+    model.on_arrow_right().unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.column, LAST_COLUMN);
+}
+
+#[test]
+fn page_down() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    let window_height = DEFAULT_WINDOW_HEIGH as f64;
+    let row_height = DEFAULT_ROW_HEIGHT;
+    let row_count = f64::floor(window_height / row_height) as i32;
+    model.on_page_down().unwrap();
+
+    let view = model.get_selected_view();
+    assert_eq!(view.row, 1 + row_count);
+    let scroll_y = model.get_scroll_y().unwrap();
+    assert_eq!(scroll_y, (row_count as f64) * DEFAULT_ROW_HEIGHT);
+}
+
+// we just test that page up and page down are inverse operations
+#[test]
+fn page_up() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    model.on_page_down().unwrap();
+    let row1 = model.get_selected_view().row;
+
+    model.on_page_down().unwrap();
+    let row2 = model.get_selected_view().row;
+
+    model.on_page_down().unwrap();
+    let row3 = model.get_selected_view().row;
+
+    model.on_page_down().unwrap();
+
+    model.on_page_up().unwrap();
+    assert_eq!(model.get_selected_view().row, row3);
+
+    model.on_page_up().unwrap();
+    assert_eq!(model.get_selected_view().row, row2);
+
+    model.on_page_up().unwrap();
+    assert_eq!(model.get_selected_view().row, row1);
+
+    model.on_page_up().unwrap();
+    assert_eq!(model.get_selected_view().row, 1);
+}
+
+#[test]
+fn page_up_fails_on_row1() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    model.on_arrow_up().unwrap();
+    assert_eq!(model.get_selected_view().row, 1);
+}
--- a/base/src/test/user_model/test_on_area_selection.rs
+++ b/base/src/test/user_model/test_on_area_selection.rs
@@ -0,0 +1,33 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::{
+    constants::{DEFAULT_COLUMN_WIDTH, DEFAULT_WINDOW_WIDTH},
+    test::util::new_empty_model,
+    UserModel,
+};
+
+#[test]
+fn basic_test() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+
+    model.on_area_selecting(2, 4).unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [1, 1, 2, 4]);
+}
+
+// this checks that is we select in the boundary we automatically scroll
+#[test]
+fn scroll_right() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    let window_width = DEFAULT_WINDOW_WIDTH as f64;
+    let column_width = DEFAULT_COLUMN_WIDTH;
+    let column_count = f64::floor(window_width / column_width) as i32;
+    model.set_selected_cell(3, column_count).unwrap();
+
+    model.on_area_selecting(3, column_count + 3).unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [3, column_count, 3, column_count + 3]);
+    assert_eq!(view.left_column, 4);
+}
--- a/base/src/test/user_model/test_on_expand_selected_range.rs
+++ b/base/src/test/user_model/test_on_expand_selected_range.rs
@@ -0,0 +1,151 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::{
+    constants::{DEFAULT_COLUMN_WIDTH, DEFAULT_WINDOW_WIDTH, LAST_COLUMN},
+    test::util::new_empty_model,
+    UserModel,
+};
+
+#[test]
+fn arrow_right() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    model.on_expand_selected_range("ArrowRight").unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [1, 1, 1, 2]);
+}
+
+#[test]
+fn arrow_right_decreases() {
+    // if the selected cell is on the upper right corner, right-arrow will decrease the size of teh area
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    let (start_row, start_column, end_row, end_column) = (5, 3, 10, 8);
+    model.set_selected_cell(start_row, end_column).unwrap();
+    model
+        .set_selected_range(start_row, start_column, end_row, end_column)
+        .unwrap();
+
+    model.on_expand_selected_range("ArrowRight").unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(
+        view.range,
+        [start_row, start_column + 1, end_row, end_column]
+    );
+}
+
+#[test]
+fn arrow_right_last_column() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    model.set_selected_cell(1, LAST_COLUMN).unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [1, LAST_COLUMN, 1, LAST_COLUMN]);
+}
+
+#[test]
+fn arrow_right_scroll_right() {
+    let window_width = DEFAULT_WINDOW_WIDTH as f64;
+    let column_width = DEFAULT_COLUMN_WIDTH;
+    let column_count = f64::floor(window_width / column_width) as i32;
+
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+
+    // initially the column to the left is A
+    let view = model.get_selected_view();
+    assert_eq!(view.left_column, 1);
+
+    // We select all columns from 1 to the last visible
+    let (start_row, start_column, end_row, end_column) = (1, 1, 1, column_count);
+    model.set_selected_cell(start_row, start_column).unwrap();
+    model
+        .set_selected_range(start_row, start_column, end_row, end_column)
+        .unwrap();
+
+    // Now we select one more column
+    model.on_expand_selected_range("ArrowRight").unwrap();
+
+    // The view has updated and the first visible column is B
+    let view = model.get_selected_view();
+    assert_eq!(
+        view.range,
+        [start_row, start_column, end_row, end_column + 1]
+    );
+    assert_eq!(view.left_column, 2);
+
+    // now we click on cell B2 and we
+    model.set_selected_cell(2, 2).unwrap();
+    model.on_expand_selected_range("ArrowLeft").unwrap();
+
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [2, 1, 2, 2]);
+    assert_eq!(view.left_column, 1);
+
+    // a second arrow left won't do anything
+    model.on_expand_selected_range("ArrowLeft").unwrap();
+
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [2, 1, 2, 2]);
+    assert_eq!(view.left_column, 1);
+}
+
+#[test]
+fn arrow_left() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    model.set_selected_cell(5, 3).unwrap();
+    model.set_selected_range(5, 3, 10, 8).unwrap();
+    model.on_expand_selected_range("ArrowLeft").unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [5, 3, 10, 7]);
+}
+
+#[test]
+fn arrow_left_left_border() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    model.on_expand_selected_range("ArrowLeft").unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [1, 1, 1, 1]);
+}
+
+#[test]
+fn arrow_left_increases() {
+    // If the selected cell is on the top right corner
+    // arrow left increases the selected area by
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+
+    let (start_row, start_column, end_row, end_column) = (4, 10, 4, 20);
+    model.set_selected_cell(start_row, end_column).unwrap();
+    model
+        .set_selected_range(start_row, start_column, end_row, end_column)
+        .unwrap();
+    model.on_expand_selected_range("ArrowLeft").unwrap();
+    let view = model.get_selected_view();
+    assert_eq!(
+        view.range,
+        [start_row, start_column - 1, end_row, end_column]
+    );
+}
+
+#[test]
+fn arrow_left_scrolls_left() {
+    // If the selected cell is on the top right corner
+    // arrow left increases the selected area by
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+
+    model.set_top_left_visible_cell(1, 50).unwrap();
+
+    model.set_selected_cell(1, 50).unwrap();
+    // arrow left x 2
+    model.on_expand_selected_range("ArrowLeft").unwrap();
+    model.on_expand_selected_range("ArrowLeft").unwrap();
+
+    let view = model.get_selected_view();
+    assert_eq!(view.range, [1, 48, 1, 50]);
+    assert_eq!(view.left_column, 48);
+    assert_eq!(view.column, 50);
+}
--- a/base/src/test/user_model/test_on_paste_styles.rs
+++ b/base/src/test/user_model/test_on_paste_styles.rs
@@ -0,0 +1,48 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+use crate::types::Fill;
+use crate::UserModel;
+
+#[test]
+fn simple_pasting() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    let mut style = model.get_cell_style(0, 1, 1).unwrap();
+    style.fill = Fill {
+        pattern_type: "solid".to_string(),
+        fg_color: Some("#FF5577".to_string()),
+        bg_color: Some("#33FF44".to_string()),
+    };
+    let styles = vec![vec![style.clone()]];
+
+    model.set_selected_cell(5, 4).unwrap();
+    model.set_selected_range(5, 4, 10, 9).unwrap();
+    model.on_paste_styles(&styles).unwrap();
+
+    for row in 5..10 {
+        for column in 4..9 {
+            let cell_style = model.get_cell_style(0, row, column).unwrap();
+            assert_eq!(cell_style, style);
+        }
+    }
+
+    model.undo().unwrap();
+    let base_style = model.get_cell_style(0, 100, 100).unwrap();
+
+    for row in 5..10 {
+        for column in 4..9 {
+            let cell_style = model.get_cell_style(0, row, column).unwrap();
+            assert_eq!(cell_style, base_style);
+        }
+    }
+
+    model.redo().unwrap();
+
+    for row in 5..10 {
+        for column in 4..9 {
+            let cell_style = model.get_cell_style(0, row, column).unwrap();
+            assert_eq!(cell_style, style);
+        }
+    }
+}
--- a/base/src/test/user_model/test_paste_csv.rs
+++ b/base/src/test/user_model/test_paste_csv.rs
@@ -0,0 +1,164 @@
+use crate::{expressions::types::Area, UserModel};
+
+#[test]
+fn csv_paste() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.set_user_input(0, 7, 7, "=SUM(B4:D7)").unwrap();
+    assert_eq!(model.get_formatted_cell_value(0, 7, 7), Ok("0".to_string()));
+
+    // paste some numbers in B4:C7
+    let csv = "1,2,3\n4,5,6";
+    let area = Area {
+        sheet: 0,
+        row: 4,
+        column: 2,
+        width: 1,
+        height: 1,
+    };
+    model.set_selected_cell(4, 2).unwrap();
+    model.paste_csv_string(&area, csv).unwrap();
+
+    assert_eq!(
+        model.get_formatted_cell_value(0, 7, 7),
+        Ok("21".to_string())
+    );
+}
+
+#[test]
+fn tsv_crlf_paste() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.set_user_input(0, 7, 7, "=SUM(B4:D7)").unwrap();
+    assert_eq!(model.get_formatted_cell_value(0, 7, 7), Ok("0".to_string()));
+
+    // paste some numbers in B4:C7
+    let csv = "1\t2\t3\r\n4\t5\t6";
+    let area = Area {
+        sheet: 0,
+        row: 4,
+        column: 2,
+        width: 1,
+        height: 1,
+    };
+    model.set_selected_cell(4, 2).unwrap();
+    model.paste_csv_string(&area, csv).unwrap();
+
+    assert_eq!(
+        model.get_formatted_cell_value(0, 7, 7),
+        Ok("21".to_string())
+    );
+}
+
+#[test]
+fn cut_paste() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.set_user_input(0, 1, 1, "42").unwrap();
+    model.set_user_input(0, 1, 2, "=A1*3+1").unwrap();
+
+    // set A1 bold
+    let range = Area {
+        sheet: 0,
+        row: 1,
+        column: 1,
+        width: 1,
+        height: 1,
+    };
+    model.update_range_style(&range, "font.b", "true").unwrap();
+
+    model
+        .set_user_input(0, 2, 1, "A season of faith, \"perfection\"")
+        .unwrap();
+
+    // Select A1:B2 and copy
+    model.set_selected_range(1, 1, 2, 2).unwrap();
+    let copy = model.copy_to_clipboard().unwrap();
+
+    model.set_selected_cell(4, 4).unwrap();
+
+    // paste in cell D4 (4, 4)
+    model
+        .paste_from_clipboard((1, 1, 2, 2), &copy.data, true)
+        .unwrap();
+
+    assert_eq!(model.get_cell_content(0, 4, 4), Ok("42".to_string()));
+    assert_eq!(model.get_cell_content(0, 4, 5), Ok("=D4*3+1".to_string()));
+    assert_eq!(
+        model.get_formatted_cell_value(0, 4, 5),
+        Ok("127".to_string())
+    );
+    // cell D4 must be bold
+    let style_d4 = model.get_cell_style(0, 4, 4).unwrap();
+    assert!(style_d4.font.b);
+
+    // range A1:B2 must be empty
+    assert_eq!(model.get_cell_content(0, 1, 1), Ok("".to_string()));
+    assert_eq!(model.get_cell_content(0, 1, 2), Ok("".to_string()));
+    assert_eq!(model.get_cell_content(0, 2, 1), Ok("".to_string()));
+    assert_eq!(model.get_cell_content(0, 2, 2), Ok("".to_string()));
+}
+
+#[test]
+fn copy_paste_internal() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.set_user_input(0, 1, 1, "42").unwrap();
+    model.set_user_input(0, 1, 2, "=A1*3+1").unwrap();
+
+    // set A1 bold
+    let range = Area {
+        sheet: 0,
+        row: 1,
+        column: 1,
+        width: 1,
+        height: 1,
+    };
+    model.update_range_style(&range, "font.b", "true").unwrap();
+
+    model
+        .set_user_input(0, 2, 1, "A season of faith, \"perfection\"")
+        .unwrap();
+
+    // Select A1:B2 and copy
+    model.set_selected_range(1, 1, 2, 2).unwrap();
+    let copy = model.copy_to_clipboard().unwrap();
+    assert_eq!(
+        copy.csv,
+        "42,127\n\"A season of faith, \"\"perfection\"\"\",\n"
+    );
+    assert_eq!(copy.range, (1, 1, 2, 2));
+
+    model.set_selected_cell(4, 4).unwrap();
+
+    // paste in cell D4 (4, 4)
+    model
+        .paste_from_clipboard((1, 1, 2, 2), &copy.data, false)
+        .unwrap();
+
+    assert_eq!(model.get_cell_content(0, 4, 4), Ok("42".to_string()));
+    assert_eq!(model.get_cell_content(0, 4, 5), Ok("=D4*3+1".to_string()));
+    assert_eq!(
+        model.get_formatted_cell_value(0, 4, 5),
+        Ok("127".to_string())
+    );
+    // cell D4 must be bold
+    let style_d4 = model.get_cell_style(0, 4, 4).unwrap();
+    assert!(style_d4.font.b);
+
+    model.undo().unwrap();
+
+    assert_eq!(model.get_cell_content(0, 4, 4), Ok("".to_string()));
+    assert_eq!(model.get_cell_content(0, 4, 5), Ok("".to_string()));
+    // cell D4 must not be bold
+    let style_d4 = model.get_cell_style(0, 4, 4).unwrap();
+    assert!(!style_d4.font.b);
+
+    model.redo().unwrap();
+
+    assert_eq!(model.get_cell_content(0, 4, 4), Ok("42".to_string()));
+    assert_eq!(model.get_cell_content(0, 4, 5), Ok("=D4*3+1".to_string()));
+    assert_eq!(
+        model.get_formatted_cell_value(0, 4, 5),
+        Ok("127".to_string())
+    );
+    // cell D4 must be bold
+    let style_d4 = model.get_cell_style(0, 4, 4).unwrap();
+    assert!(style_d4.font.b);
+}
--- a/base/src/test/user_model/test_rename_sheet.rs
+++ b/base/src/test/user_model/test_rename_sheet.rs
@@ -9,6 +9,13 @@ fn basic_rename() {
    assert_eq!(model.get_worksheets_properties()[0].name, "NewSheet");
 }

+#[test]
+fn rename_with_same_name() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.rename_sheet(0, "Sheet1").unwrap();
+    assert_eq!(model.get_worksheets_properties()[0].name, "Sheet1");
+}
+
 #[test]
 fn undo_redo() {
    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
--- a/base/src/test/user_model/test_row_column.rs
+++ b/base/src/test/user_model/test_row_column.rs
@@ -154,3 +154,21 @@ fn simple_delete_row_no_style() {

    assert_eq!(model.get_formatted_cell_value(0, 15, 6), Ok("".to_string()));
 }
+
+#[test]
+fn row_heigh_increases_automatically() {
+    let mut model = UserModel::new_empty("Workbook1", "en", "UTC").unwrap();
+    assert_eq!(model.get_row_height(0, 1), Ok(DEFAULT_ROW_HEIGHT));
+
+    // Entering a single line does not change the height
+    model
+        .set_user_input(0, 1, 1, "My home in Canada had horses")
+        .unwrap();
+    assert_eq!(model.get_row_height(0, 1), Ok(DEFAULT_ROW_HEIGHT));
+
+    // entering a two liner does:
+    model
+        .set_user_input(0, 1, 1, "My home in Canada had horses\nAnd monkeys!")
+        .unwrap();
+    assert_eq!(model.get_row_height(0, 1), Ok(2.0 * DEFAULT_ROW_HEIGHT));
+}
--- a/base/src/test/user_model/test_styles.rs
+++ b/base/src/test/user_model/test_styles.rs
@@ -145,6 +145,7 @@ fn basic_fill() {
    let style = model.get_cell_style(0, 1, 1).unwrap();
    assert_eq!(style.fill.bg_color, None);
    assert_eq!(style.fill.fg_color, None);
+    assert_eq!(&style.fill.pattern_type, "none");

    // bg_color
    model
@@ -156,6 +157,7 @@ fn basic_fill() {
    let style = model.get_cell_style(0, 1, 1).unwrap();
    assert_eq!(style.fill.bg_color, Some("#F2F2F2".to_owned()));
    assert_eq!(style.fill.fg_color, Some("#F3F4F5".to_owned()));
+    assert_eq!(&style.fill.pattern_type, "solid");

    let send_queue = model.flush_send_queue();

--- a/base/src/test/user_model/test_view.rs
+++ b/base/src/test/user_model/test_view.rs
@@ -52,19 +52,12 @@ fn set_the_cell_sets_the_range() {
 fn set_the_range_does_not_set_the_cell() {
    let model = new_empty_model();
    let mut model = UserModel::from_model(model);
-    model.set_selected_range(5, 4, 10, 6).unwrap();
-    assert_eq!(model.get_selected_sheet(), 0);
-    assert_eq!(model.get_selected_cell(), (0, 1, 1));
    assert_eq!(
-        model.get_selected_view(),
-        SelectedView {
-            sheet: 0,
-            row: 1,
-            column: 1,
-            range: [5, 4, 10, 6],
-            top_row: 1,
-            left_column: 1
-        }
+        model.set_selected_range(5, 4, 10, 6),
+        Err(
+            "The selected cells is not in one of the corners. Row: '1' and row range '(5, 10)'"
+                .to_string()
+        )
    );
 }

@@ -72,13 +65,13 @@ fn set_the_range_does_not_set_the_cell() {
 fn add_new_sheet_and_back() {
    let model = new_empty_model();
    let mut model = UserModel::from_model(model);
-    model.new_sheet();
-    assert_eq!(model.get_selected_sheet(), 0);
+    model.new_sheet().unwrap();
+    assert_eq!(model.get_selected_sheet(), 1);
    model.set_selected_cell(5, 4).unwrap();
-    model.set_selected_sheet(1).unwrap();
-    assert_eq!(model.get_selected_cell(), (1, 1, 1));
    model.set_selected_sheet(0).unwrap();
-    assert_eq!(model.get_selected_cell(), (0, 5, 4));
+    assert_eq!(model.get_selected_cell(), (0, 1, 1));
+    model.set_selected_sheet(1).unwrap();
+    assert_eq!(model.get_selected_cell(), (1, 5, 4));
 }

 #[test]
--- a/base/src/test/user_model/test_window_size.rs
+++ b/base/src/test/user_model/test_window_size.rs
@@ -0,0 +1,29 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::{
+    constants::{DEFAULT_ROW_HEIGHT, DEFAULT_WINDOW_HEIGH, DEFAULT_WINDOW_WIDTH},
+    test::util::new_empty_model,
+    UserModel,
+};
+
+#[test]
+fn basic_test() {
+    let model = new_empty_model();
+    let mut model = UserModel::from_model(model);
+    let window_height = model.get_window_height().unwrap();
+    assert_eq!(window_height, DEFAULT_WINDOW_HEIGH);
+
+    let window_width = model.get_window_width().unwrap();
+    assert_eq!(window_width, DEFAULT_WINDOW_WIDTH);
+
+    // Set the window height to double the default and check that page_down behaves as expected
+    model.set_window_height((window_height * 2) as f64);
+    model.on_page_down().unwrap();
+
+    let row_height = DEFAULT_ROW_HEIGHT;
+    let row_count = f64::floor((window_height * 2) as f64 / row_height) as i32;
+    let view = model.get_selected_view();
+    assert_eq!(view.row, 1 + row_count);
+    let scroll_y = model.get_scroll_y().unwrap();
+    assert_eq!(scroll_y, (row_count as f64) * DEFAULT_ROW_HEIGHT);
+}
--- a/base/src/test/util.rs
+++ b/base/src/test/util.rs
@@ -20,7 +20,8 @@ impl Model {
        let cell_reference = self._parse_reference(cell);
        let column = cell_reference.column;
        let row = cell_reference.row;
-        self.set_user_input(cell_reference.sheet, row, column, value.to_string());
+        self.set_user_input(cell_reference.sheet, row, column, value.to_string())
+            .unwrap();
    }
    pub fn _has_formula(&self, cell: &str) -> bool {
        self._get_formula_opt(cell).is_some()
--- a/base/src/units.rs
+++ b/base/src/units.rs
@@ -7,17 +7,20 @@ use crate::{

 pub enum Units {
    Number {
+        #[allow(dead_code)]
        group_separator: bool,
        precision: i32,
        num_fmt: String,
    },
    Currency {
+        #[allow(dead_code)]
        group_separator: bool,
        precision: i32,
        num_fmt: String,
        currency: String,
    },
    Percentage {
+        #[allow(dead_code)]
        group_separator: bool,
        precision: i32,
        num_fmt: String,
@@ -86,12 +89,15 @@ fn get_units_from_format_string(num_fmt: &str) -> Option<Units> {

 impl Model {
    fn compute_cell_units(&self, cell_reference: &CellReferenceIndex) -> Option<Units> {
-        let style = &self.get_style_for_cell(
+        let cell_style_res = &self.get_style_for_cell(
            cell_reference.sheet,
            cell_reference.row,
            cell_reference.column,
        );
-        get_units_from_format_string(&style.num_fmt)
+        match cell_style_res {
+            Ok(style) => get_units_from_format_string(&style.num_fmt),
+            Err(_) => None,
+        }
    }

    pub(crate) fn compute_node_units(
--- a/base/src/user_model/common.rs
+++ b/base/src/user_model/common.rs
@@ -1,13 +1,15 @@
 #![deny(missing_docs)]

-use std::{collections::HashMap, fmt::Debug};
+use std::{collections::HashMap, fmt::Debug, io::Cursor};

+use csv::{ReaderBuilder, WriterBuilder};
+use csv_sniffer::Sniffer;
 use serde::{Deserialize, Serialize};

 use crate::{
-    constants,
+    constants::{self, DEFAULT_ROW_HEIGHT, LAST_COLUMN, LAST_ROW},
    expressions::{
-        types::Area,
+        types::{Area, CellReferenceIndex},
        utils::{is_valid_column_number, is_valid_row},
    },
    model::Model,
@@ -21,8 +23,25 @@ use crate::{
 use crate::user_model::history::{
    ColumnData, Diff, DiffList, DiffType, History, QueueDiffs, RowData,
 };
+/// Data for the clipboard
+pub type ClipboardData = HashMap<i32, HashMap<i32, ClipboardCell>>;
+
+pub type ClipboardTuple = (i32, i32, i32, i32);

 #[derive(Serialize, Deserialize)]
+pub struct ClipboardCell {
+    text: String,
+    style: Style,
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct Clipboard {
+    pub(crate) csv: String,
+    pub(crate) data: ClipboardData,
+    pub(crate) range: (i32, i32, i32, i32),
+}
+
+#[derive(Serialize, Deserialize, PartialEq)]
 pub enum BorderType {
    All,
    Inner,
@@ -205,6 +224,16 @@ impl UserModel {
        self.model.to_bytes()
    }

+    /// Returns the workbook name
+    pub fn get_name(&self) -> String {
+        self.model.workbook.name.clone()
+    }
+
+    /// Sets the name of a workbook
+    pub fn set_name(&mut self, name: &str) {
+        self.model.workbook.name = name.to_string();
+    }
+
    /// Undoes last change if any, places the change in the redo list and evaluates the model if needed
    ///
    /// See also:
@@ -331,17 +360,31 @@ impl UserModel {
            .cell(row, column)
            .cloned();
        self.model
-            .set_user_input(sheet, row, column, value.to_string());
+            .set_user_input(sheet, row, column, value.to_string())?;

        self.evaluate_if_not_paused();

-        let diff_list = vec![Diff::SetCellValue {
+        let mut diff_list = vec![Diff::SetCellValue {
            sheet,
            row,
            column,
            new_value: value.to_string(),
            old_value: Box::new(old_value),
        }];
+
+        let line_count = value.split("\n").count();
+        let row_height = self.model.get_row_height(sheet, row)?;
+        let cell_height = (line_count as f64) * DEFAULT_ROW_HEIGHT;
+        if cell_height > row_height {
+            diff_list.push(Diff::SetRowHeight {
+                sheet,
+                row,
+                new_value: cell_height,
+                old_value: row_height,
+            });
+            self.model.set_row_height(sheet, row, cell_height)?;
+        }
+
        self.push_diff_list(diff_list);
        Ok(())
    }
@@ -381,9 +424,11 @@ impl UserModel {
    ///
    /// See also:
    /// * [Model::new_sheet]
-    pub fn new_sheet(&mut self) {
+    pub fn new_sheet(&mut self) -> Result<(), String> {
        let (name, index) = self.model.new_sheet();
+        self.set_selected_sheet(index)?;
        self.push_diff_list(vec![Diff::NewSheet { index, name }]);
+        Ok(())
    }

    /// Deletes sheet by index
@@ -394,6 +439,14 @@ impl UserModel {
        self.push_diff_list(vec![Diff::DeleteSheet { sheet }]);
        // There is no coming back
        self.history.clear();
+        let sheet_count = self.model.workbook.worksheets.len() as u32;
+        // If we are deleting the last sheet we need to change the selected sheet
+        if sheet == sheet_count - 1 && sheet_count > 1 {
+            if let Some(view) = self.model.workbook.views.get_mut(&self.model.view_id) {
+                view.sheet = sheet_count - 2;
+            };
+        }
+
        self.model.delete_sheet(sheet)?;
        Ok(())
    }
@@ -404,6 +457,9 @@ impl UserModel {
    /// * [Model::rename_sheet_by_index]
    pub fn rename_sheet(&mut self, sheet: u32, new_name: &str) -> Result<(), String> {
        let old_value = self.model.workbook.worksheet(sheet)?.name.clone();
+        if old_value == new_name {
+            return Ok(());
+        }
        self.model.rename_sheet_by_index(sheet, new_name)?;
        self.push_diff_list(vec![Diff::RenameSheet {
            index: sheet,
@@ -449,7 +505,7 @@ impl UserModel {
                    .worksheet(sheet)?
                    .cell(row, column)
                    .cloned();
-                let old_style = self.model.get_style_for_cell(sheet, row, column);
+                let old_style = self.model.get_style_for_cell(sheet, row, column)?;
                self.model.cell_clear_all(sheet, row, column)?;
                diff_list.push(Diff::CellClearAll {
                    sheet,
@@ -712,7 +768,7 @@ impl UserModel {
                let row_index = ((row - row_start) % styles_heigh) as usize;
                let column_index = ((column - column_start) % styles_width) as usize;
                let style = &styles[row_index][column_index];
-                let old_value = self.model.get_style_for_cell(sheet, row, column);
+                let old_value = self.model.get_style_for_cell(sheet, row, column)?;
                self.model.set_cell_style(sheet, row, column, style)?;
                diff_list.push(Diff::SetCellStyle {
                    sheet,
@@ -746,15 +802,9 @@ impl UserModel {
        let last_column = range.column + range.width - 1;
        for row in range.row..=last_row {
            for column in range.column..=last_column {
-                let old_value = self.model.get_style_for_cell(sheet, row, column);
+                let old_value = self.model.get_style_for_cell(sheet, row, column)?;
                let mut style = old_value.clone();

-                // First remove all existing borders
-                style.border.top = None;
-                style.border.right = None;
-                style.border.bottom = None;
-                style.border.left = None;
-
                match border_area.r#type {
                    BorderType::All => {
                        style.border.top = Some(border_area.item.clone());
@@ -811,7 +861,10 @@ impl UserModel {
                        }
                    }
                    BorderType::None => {
-                        // noop, we already removed all the borders
+                        style.border.top = None;
+                        style.border.right = None;
+                        style.border.bottom = None;
+                        style.border.left = None;
                    }
                }

@@ -825,6 +878,122 @@ impl UserModel {
                });
            }
        }
+        // bottom of the cells above the first
+        if range.row > 1
+            && [
+                BorderType::Top,
+                BorderType::All,
+                BorderType::None,
+                BorderType::Outer,
+            ]
+            .contains(&border_area.r#type)
+        {
+            let row = range.row - 1;
+            for column in range.column..=last_column {
+                let old_value = self.model.get_style_for_cell(sheet, row, column)?;
+                let mut style = old_value.clone();
+                if border_area.r#type == BorderType::None {
+                    style.border.bottom = None;
+                } else {
+                    style.border.bottom = Some(border_area.item.clone());
+                }
+                self.model.set_cell_style(sheet, row, column, &style)?;
+                diff_list.push(Diff::SetCellStyle {
+                    sheet,
+                    row,
+                    column,
+                    old_value: Box::new(old_value),
+                    new_value: Box::new(style),
+                });
+            }
+        }
+        // Cells to the right
+        if last_column < LAST_COLUMN
+            && [
+                BorderType::Right,
+                BorderType::All,
+                BorderType::None,
+                BorderType::Outer,
+            ]
+            .contains(&border_area.r#type)
+        {
+            let column = last_column + 1;
+            for row in range.row..=last_row {
+                let old_value = self.model.get_style_for_cell(sheet, row, column)?;
+                let mut style = old_value.clone();
+                if border_area.r#type == BorderType::None {
+                    style.border.left = None;
+                } else {
+                    style.border.left = Some(border_area.item.clone());
+                }
+                self.model.set_cell_style(sheet, row, column, &style)?;
+                diff_list.push(Diff::SetCellStyle {
+                    sheet,
+                    row,
+                    column,
+                    old_value: Box::new(old_value),
+                    new_value: Box::new(style),
+                });
+            }
+        }
+        // Cells bellow
+        if last_row < LAST_ROW
+            && [
+                BorderType::Bottom,
+                BorderType::All,
+                BorderType::None,
+                BorderType::Outer,
+            ]
+            .contains(&border_area.r#type)
+        {
+            let row = last_row + 1;
+            for column in range.column..=last_column {
+                let old_value = self.model.get_style_for_cell(sheet, row, column)?;
+                let mut style = old_value.clone();
+                if border_area.r#type == BorderType::None {
+                    style.border.top = None;
+                } else {
+                    style.border.top = Some(border_area.item.clone());
+                }
+                self.model.set_cell_style(sheet, row, column, &style)?;
+                diff_list.push(Diff::SetCellStyle {
+                    sheet,
+                    row,
+                    column,
+                    old_value: Box::new(old_value),
+                    new_value: Box::new(style),
+                });
+            }
+        }
+        // Cells to the left
+        if range.column > 1
+            && [
+                BorderType::Left,
+                BorderType::All,
+                BorderType::None,
+                BorderType::Outer,
+            ]
+            .contains(&border_area.r#type)
+        {
+            let column = range.column - 1;
+            for row in range.row..=last_row {
+                let old_value = self.model.get_style_for_cell(sheet, row, column)?;
+                let mut style = old_value.clone();
+                if border_area.r#type == BorderType::None {
+                    style.border.right = None;
+                } else {
+                    style.border.right = Some(border_area.item.clone());
+                }
+                self.model.set_cell_style(sheet, row, column, &style)?;
+                diff_list.push(Diff::SetCellStyle {
+                    sheet,
+                    row,
+                    column,
+                    old_value: Box::new(old_value),
+                    new_value: Box::new(style),
+                });
+            }
+        }

        self.push_diff_list(diff_list);
        Ok(())
@@ -843,7 +1012,7 @@ impl UserModel {
        let mut diff_list = Vec::new();
        for row in range.row..range.row + range.height {
            for column in range.column..range.column + range.width {
-                let old_value = self.model.get_style_for_cell(sheet, row, column);
+                let old_value = self.model.get_style_for_cell(sheet, row, column)?;
                let mut style = old_value.clone();
                match style_path {
                    "font.b" => {
@@ -863,9 +1032,11 @@ impl UserModel {
                    }
                    "fill.bg_color" => {
                        style.fill.bg_color = color(value)?;
+                        style.fill.pattern_type = "solid".to_string();
                    }
                    "fill.fg_color" => {
                        style.fill.fg_color = color(value)?;
+                        style.fill.pattern_type = "solid".to_string();
                    }
                    "num_fmt" => {
                        value.clone_into(&mut style.num_fmt);
@@ -941,8 +1112,8 @@ impl UserModel {
    /// See also:
    /// * [Model::get_style_for_cell]
    #[inline]
-    pub fn get_cell_style(&mut self, sheet: u32, row: i32, column: i32) -> Result<Style, String> {
-        Ok(self.model.get_style_for_cell(sheet, row, column))
+    pub fn get_cell_style(&self, sheet: u32, row: i32, column: i32) -> Result<Style, String> {
+        self.model.get_style_for_cell(sheet, row, column)
    }

    /// Fills the cells from `source_area` until `to_row`.
@@ -1008,7 +1179,7 @@ impl UserModel {
                    .worksheet(sheet)?
                    .cell(row, column)
                    .cloned();
-                let old_style = self.model.get_style_for_cell(sheet, row, column);
+                let old_style = self.model.get_style_for_cell(sheet, row, column)?;

                // compute the new value and set it
                let source_row = anchor_row + index;
@@ -1016,10 +1187,10 @@ impl UserModel {
                    .model
                    .extend_to(sheet, source_row, column, row, column)?;
                self.model
-                    .set_user_input(sheet, row, column, target_value.to_string());
+                    .set_user_input(sheet, row, column, target_value.to_string())?;

                // Compute the new style and set it
-                let new_style = self.model.get_style_for_cell(sheet, source_row, column);
+                let new_style = self.model.get_style_for_cell(sheet, source_row, column)?;
                self.model.set_cell_style(sheet, row, column, &new_style)?;

                // Add the diffs
@@ -1109,7 +1280,7 @@ impl UserModel {
                    .worksheet(sheet)?
                    .cell(row, column)
                    .cloned();
-                let old_style = self.model.get_style_for_cell(sheet, row, column);
+                let old_style = self.model.get_style_for_cell(sheet, row, column)?;

                // compute the new value and set it
                let source_column = anchor_column + index;
@@ -1117,10 +1288,10 @@ impl UserModel {
                    .model
                    .extend_to(sheet, row, source_column, row, column)?;
                self.model
-                    .set_user_input(sheet, row, column, target_value.to_string());
+                    .set_user_input(sheet, row, column, target_value.to_string())?;

                // Compute the new style and set it
-                let new_style = self.model.get_style_for_cell(sheet, row, source_column);
+                let new_style = self.model.get_style_for_cell(sheet, row, source_column)?;
                self.model.set_cell_style(sheet, row, column, &new_style)?;

                // Add the diffs
@@ -1174,6 +1345,215 @@ impl UserModel {
        Ok(self.model.workbook.worksheet(sheet)?.show_grid_lines)
    }

+    /// Returns a copy of the selected area
+    pub fn copy_to_clipboard(&self) -> Result<Clipboard, String> {
+        let selected_area = self.get_selected_view();
+        let sheet = selected_area.sheet;
+        let mut wtr = WriterBuilder::new().from_writer(vec![]);
+
+        let mut data = HashMap::new();
+        let [row_start, column_start, row_end, column_end] = selected_area.range;
+        for row in row_start..=row_end {
+            let mut data_row = HashMap::new();
+            let mut text_row = Vec::new();
+            for column in column_start..=column_end {
+                let text = self.get_formatted_cell_value(sheet, row, column)?;
+                let content = self.get_cell_content(sheet, row, column)?;
+                let style = self.get_cell_style(sheet, row, column)?;
+                data_row.insert(
+                    column,
+                    ClipboardCell {
+                        text: content,
+                        style,
+                    },
+                );
+                text_row.push(text);
+            }
+            wtr.write_record(text_row).unwrap();
+            data.insert(row, data_row);
+        }
+
+        let csv = String::from_utf8(wtr.into_inner().unwrap()).unwrap();
+
+        Ok(Clipboard {
+            csv,
+            data,
+            range: (row_start, column_start, row_end, column_end),
+        })
+    }
+
+    /// Paste text that we copied
+    pub fn paste_from_clipboard(
+        &mut self,
+        source_range: ClipboardTuple,
+        clipboard: &ClipboardData,
+        is_cut: bool,
+    ) -> Result<(), String> {
+        let mut diff_list = Vec::new();
+        let view = self.get_selected_view();
+        let (source_first_row, source_first_column, source_last_row, source_last_column) =
+            source_range;
+        let sheet = view.sheet;
+        let [selected_row, selected_column, _, _] = view.range;
+        let mut max_row = selected_row;
+        let mut max_column = selected_column;
+        let area = &Area {
+            sheet,
+            row: source_first_row,
+            column: source_first_column,
+            width: source_last_column - source_first_column + 1,
+            height: source_last_row - source_first_row + 1,
+        };
+        for (source_row, data_row) in clipboard {
+            let delta_row = source_row - source_first_row;
+            let target_row = selected_row + delta_row;
+            max_row = max_row.max(target_row);
+            for (source_column, value) in data_row {
+                let delta_column = source_column - source_first_column;
+                let target_column = selected_column + delta_column;
+                max_column = max_column.max(target_column);
+
+                // We are copying the value in
+                // (source_row, source_column) to (target_row , target_column)
+                // References in formulas are displaced
+
+                // remain in the copied area
+                let source = &CellReferenceIndex {
+                    sheet,
+                    column: *source_column,
+                    row: *source_row,
+                };
+                let target = &CellReferenceIndex {
+                    sheet,
+                    column: target_column,
+                    row: target_row,
+                };
+                let new_value = if is_cut {
+                    self.model
+                        .move_cell_value_to_area(&value.text, source, target, area)?
+                } else {
+                    self.model
+                        .extend_copied_value(&value.text, source, target)?
+                };
+
+                let old_value = self
+                    .model
+                    .workbook
+                    .worksheet(sheet)?
+                    .cell(target_row, target_column)
+                    .cloned();
+
+                let old_style = self
+                    .model
+                    .get_style_for_cell(sheet, target_row, target_column)?;
+
+                self.model
+                    .set_user_input(sheet, target_row, target_column, new_value.clone())?;
+                self.model
+                    .set_cell_style(sheet, target_row, target_column, &value.style)?;
+
+                diff_list.push(Diff::SetCellValue {
+                    sheet,
+                    row: target_row,
+                    column: target_column,
+                    new_value,
+                    old_value: Box::new(old_value),
+                });
+
+                diff_list.push(Diff::SetCellStyle {
+                    sheet,
+                    row: target_row,
+                    column: target_column,
+                    old_value: Box::new(old_style),
+                    new_value: Box::new(value.style.clone()),
+                });
+            }
+        }
+        if is_cut {
+            for row in source_first_row..=source_last_row {
+                for column in source_first_column..=source_last_column {
+                    let old_value = self
+                        .model
+                        .workbook
+                        .worksheet(sheet)?
+                        .cell(row, column)
+                        .cloned();
+                    diff_list.push(Diff::CellClearContents {
+                        sheet,
+                        row,
+                        column,
+                        old_value: Box::new(old_value),
+                    });
+                    self.model.cell_clear_contents(sheet, row, column)?;
+                }
+            }
+        }
+        self.push_diff_list(diff_list);
+        // select the pasted area
+        self.set_selected_range(selected_row, selected_column, max_row, max_column)?;
+        self.evaluate_if_not_paused();
+        Ok(())
+    }
+
+    /// Paste a csv-string into the model
+    pub fn paste_csv_string(&mut self, area: &Area, csv: &str) -> Result<(), String> {
+        let mut diff_list = Vec::new();
+        let sheet = area.sheet;
+        let mut row = area.row;
+        let mut column = area.column;
+        // Create a sniffer with default settings
+        let mut sniffer = Sniffer::new();
+        let mut csv_reader = Cursor::new(csv);
+
+        // Sniff the CSV metadata
+        let metadata = sniffer
+            .sniff_reader(&mut csv_reader)
+            .map_err(|_| "Failed")?;
+        // Reset the cursor to the beginning after sniffing
+        csv_reader.set_position(0);
+        let mut reader = ReaderBuilder::new()
+            .delimiter(metadata.dialect.delimiter)
+            .has_headers(false)
+            .from_reader(csv_reader);
+        for record in reader.records() {
+            match record {
+                Ok(r) => {
+                    column = area.column;
+                    for value in &r {
+                        let old_value = self
+                            .model
+                            .workbook
+                            .worksheet(sheet)?
+                            .cell(row, column)
+                            .cloned();
+                        // let old_style = self.model.get_style_for_cell(sheet, row, column)?;
+                        self.model
+                            .set_user_input(sheet, row, column, value.to_string())?;
+
+                        diff_list.push(Diff::SetCellValue {
+                            sheet,
+                            row,
+                            column,
+                            new_value: value.to_string(),
+                            old_value: Box::new(old_value),
+                        });
+                        column += 1;
+                    }
+                }
+                Err(_) => {
+                    // skip
+                    continue;
+                }
+            };
+            row += 1;
+        }
+        self.push_diff_list(diff_list);
+        // select the pasted area
+        self.set_selected_range(area.row, area.column, row, column)?;
+        self.evaluate_if_not_paused();
+        Ok(())
+    }
+
    // **** Private methods ****** //

    fn push_diff_list(&mut self, diff_list: DiffList) {
@@ -1207,7 +1587,7 @@ impl UserModel {
                            self.model
                                .workbook
                                .worksheet_mut(*sheet)?
-                                .update_cell(*row, *column, value);
+                                .update_cell(*row, *column, value)?;
                        }
                        None => {
                            self.model.cell_clear_all(*sheet, *row, *column)?;
@@ -1237,7 +1617,7 @@ impl UserModel {
                        self.model
                            .workbook
                            .worksheet_mut(*sheet)?
-                            .update_cell(*row, *column, value);
+                            .update_cell(*row, *column, value)?;
                    }
                }
                Diff::CellClearAll {
@@ -1252,7 +1632,7 @@ impl UserModel {
                        self.model
                            .workbook
                            .worksheet_mut(*sheet)?
-                            .update_cell(*row, *column, value);
+                            .update_cell(*row, *column, value)?;
                        self.model
                            .set_cell_style(*sheet, *row, *column, old_style)?;
                    }
@@ -1298,7 +1678,7 @@ impl UserModel {
                    // puts all the data back
                    let worksheet = self.model.workbook.worksheet_mut(*sheet)?;
                    for (row, cell) in &old_data.data {
-                        worksheet.update_cell(*row, *column, cell.clone());
+                        worksheet.update_cell(*row, *column, cell.clone())?;
                    }
                    // makes sure that the width and style is correct
                    if let Some(col) = &old_data.column {
@@ -1366,7 +1746,7 @@ impl UserModel {
                } => {
                    needs_evaluation = true;
                    self.model
-                        .set_user_input(*sheet, *row, *column, new_value.to_string());
+                        .set_user_input(*sheet, *row, *column, new_value.to_string())?;
                }
                Diff::SetColumnWidth {
                    sheet,
--- a/base/src/user_model/mod.rs
+++ b/base/src/user_model/mod.rs
@@ -10,3 +10,4 @@ pub use common::UserModel;
 pub use ui::SelectedView;

 pub use common::BorderArea;
+pub use common::ClipboardData;
--- a/base/src/user_model/ui.rs
+++ b/base/src/user_model/ui.rs
@@ -84,7 +84,7 @@ impl UserModel {
        Ok(())
    }

-    /// Sets the selected cell
+    /// Sets the selected cell for the current view. Note that this also sets the selected range
    pub fn set_selected_cell(&mut self, row: i32, column: i32) -> Result<(), String> {
        let sheet = if let Some(view) = self.model.workbook.views.get(&self.model.view_id) {
            view.sheet
@@ -110,7 +110,7 @@ impl UserModel {
        Ok(())
    }

-    /// Sets the selected range
+    /// Sets the selected range. Note that the selected cell must be in one of the corners.
    pub fn set_selected_range(
        &mut self,
        start_row: i32,
@@ -142,6 +142,21 @@ impl UserModel {
        }
        if let Ok(worksheet) = self.model.workbook.worksheet_mut(sheet) {
            if let Some(view) = worksheet.views.get_mut(&0) {
+                let selected_row = view.row;
+                let selected_column = view.column;
+                // The selected cells must be on one of the corners of the selected range:
+                if selected_row != start_row && selected_row != end_row {
+                    return Err(format!(
+                        "The selected cells is not in one of the corners. Row: '{}' and row range '({}, {})'",
+                        selected_row, start_row, end_row
+                    ));
+                }
+                if selected_column != start_column && selected_column != end_column {
+                    return Err(format!(
+                        "The selected cells is not in one of the corners. Column '{}' and column range '({}, {})'",
+                        selected_column, start_column, end_column
+                    ));
+                }
                view.range = [start_row, start_column, end_row, end_column];
            }
        }
@@ -521,7 +536,8 @@ impl UserModel {
        Ok(scroll_y)
    }

-    /// User presses page down
+    /// User presses page down.
+    /// The `top_row` is now the first row that is not fully visible
    pub fn on_page_down(&mut self) -> Result<(), String> {
        let (sheet, window_height) =
            if let Some(view) = self.model.workbook.views.get(&self.model.view_id) {
@@ -537,12 +553,11 @@ impl UserModel {
            Some(s) => s,
            None => return Err("View not found".to_string()),
        };
-
-        let mut height = 0.0;
        let mut last_row = view.top_row;
+        let mut height = self.model.get_row_height(sheet, last_row)?;
        while height <= window_height as f64 {
-            height += self.model.get_row_height(sheet, last_row)?;
            last_row += 1;
+            height += self.model.get_row_height(sheet, last_row)?;
        }
        if !is_valid_row(last_row) {
            return Ok(());
@@ -558,11 +573,11 @@ impl UserModel {
        Ok(())
    }

-    /// On page up
+    /// On page up. tis needs to be the inverse of page down
    pub fn on_page_up(&mut self) -> Result<(), String> {
        let (sheet, window_height) =
            if let Some(view) = self.model.workbook.views.get(&self.model.view_id) {
-                (view.sheet, view.window_height)
+                (view.sheet, view.window_height as f64)
            } else {
                return Err("View not found".to_string());
            };
@@ -575,16 +590,17 @@ impl UserModel {
            None => return Err("View not found".to_string()),
        };

-        let mut height = 0.0;
-        let mut last_row = view.top_row;
-        while height <= window_height as f64 && last_row > 1 {
-            height += self.model.get_row_height(sheet, last_row)?;
-            last_row -= 1;
+        let mut first_row = view.top_row;
+        let mut height = self.model.get_row_height(sheet, first_row)?;
+        while height <= window_height && first_row > 1 {
+            first_row -= 1;
+            height += self.model.get_row_height(sheet, first_row)?;
        }
+
        let row_delta = view.row - view.top_row;
        if let Ok(worksheet) = self.model.workbook.worksheet_mut(sheet) {
            if let Some(view) = worksheet.views.get_mut(&self.model.view_id) {
-                view.top_row = last_row;
+                view.top_row = first_row;
                view.row = view.top_row + row_delta;
                view.range = [view.row, view.column, view.row, view.column];
            }
--- a/base/src/worksheet.rs
+++ b/base/src/worksheet.rs
@@ -42,7 +42,17 @@ impl Worksheet {
        self.sheet_data.get_mut(&row)?.get_mut(&column)
    }

-    pub(crate) fn update_cell(&mut self, row: i32, column: i32, new_cell: Cell) {
+    pub(crate) fn update_cell(
+        &mut self,
+        row: i32,
+        column: i32,
+        new_cell: Cell,
+    ) -> Result<(), String> {
+        // validate row and column arg before updating cell of worksheet
+        if !is_valid_row(row) || !is_valid_column_number(column) {
+            return Err("Incorrect row or column".to_string());
+        }
+
        match self.sheet_data.get_mut(&row) {
            Some(column_data) => match column_data.get(&column) {
                Some(_cell) => {
@@ -58,6 +68,7 @@ impl Worksheet {
                self.sheet_data.insert(row, column_data);
            }
        }
+        Ok(())
    }

    // TODO [MVP]: Pass the cell style from the model
@@ -128,53 +139,94 @@ impl Worksheet {
        Ok(())
    }

-    pub fn set_cell_style(&mut self, row: i32, column: i32, style_index: i32) {
+    pub fn set_cell_style(
+        &mut self,
+        row: i32,
+        column: i32,
+        style_index: i32,
+    ) -> Result<(), String> {
        match self.cell_mut(row, column) {
            Some(cell) => {
                cell.set_style(style_index);
            }
            None => {
-                self.cell_clear_contents_with_style(row, column, style_index);
+                self.cell_clear_contents_with_style(row, column, style_index)?;
            }
        }
+        Ok(())

        // TODO: cleanup check if the old cell style is still in use
    }

-    pub fn set_cell_with_formula(&mut self, row: i32, column: i32, index: i32, style: i32) {
+    pub fn set_cell_with_formula(
+        &mut self,
+        row: i32,
+        column: i32,
+        index: i32,
+        style: i32,
+    ) -> Result<(), String> {
        let cell = Cell::new_formula(index, style);
-        self.update_cell(row, column, cell);
+        self.update_cell(row, column, cell)
    }

-    pub fn set_cell_with_number(&mut self, row: i32, column: i32, value: f64, style: i32) {
+    pub fn set_cell_with_number(
+        &mut self,
+        row: i32,
+        column: i32,
+        value: f64,
+        style: i32,
+    ) -> Result<(), String> {
        let cell = Cell::new_number(value, style);
-        self.update_cell(row, column, cell);
+        self.update_cell(row, column, cell)
    }

-    pub fn set_cell_with_string(&mut self, row: i32, column: i32, index: i32, style: i32) {
+    pub fn set_cell_with_string(
+        &mut self,
+        row: i32,
+        column: i32,
+        index: i32,
+        style: i32,
+    ) -> Result<(), String> {
        let cell = Cell::new_string(index, style);
-        self.update_cell(row, column, cell);
+        self.update_cell(row, column, cell)
    }

-    pub fn set_cell_with_boolean(&mut self, row: i32, column: i32, value: bool, style: i32) {
+    pub fn set_cell_with_boolean(
+        &mut self,
+        row: i32,
+        column: i32,
+        value: bool,
+        style: i32,
+    ) -> Result<(), String> {
        let cell = Cell::new_boolean(value, style);
-        self.update_cell(row, column, cell);
+        self.update_cell(row, column, cell)
    }

-    pub fn set_cell_with_error(&mut self, row: i32, column: i32, error: Error, style: i32) {
+    pub fn set_cell_with_error(
+        &mut self,
+        row: i32,
+        column: i32,
+        error: Error,
+        style: i32,
+    ) -> Result<(), String> {
        let cell = Cell::new_error(error, style);
-        self.update_cell(row, column, cell);
+        self.update_cell(row, column, cell)
    }

-    pub fn cell_clear_contents(&mut self, row: i32, column: i32) {
+    pub fn cell_clear_contents(&mut self, row: i32, column: i32) -> Result<(), String> {
        let s = self.get_style(row, column);
        let cell = Cell::EmptyCell { s };
-        self.update_cell(row, column, cell);
+        self.update_cell(row, column, cell)
    }

-    pub fn cell_clear_contents_with_style(&mut self, row: i32, column: i32, style: i32) {
+    pub fn cell_clear_contents_with_style(
+        &mut self,
+        row: i32,
+        column: i32,
+        style: i32,
+    ) -> Result<(), String> {
        let cell = Cell::EmptyCell { s: style };
-        self.update_cell(row, column, cell);
+        self.update_cell(row, column, cell)
    }

    pub fn set_frozen_rows(&mut self, frozen_rows: i32) -> Result<(), String> {
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+++ b/bindings/python/.gitignore
@@ -0,0 +1,5 @@
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+venv/*
+sphinx-venv/*
+html/*
+tests/__pycache*
--- a/bindings/python/Cargo.lock
+++ b/bindings/python/Cargo.lock
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--- a/bindings/python/LICENSE-Apache-2.0.md
+++ b/bindings/python/LICENSE-Apache-2.0.md
@@ -0,0 +1,191 @@
+                                Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
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+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
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+      Work (including but not limited to damages for loss of goodwill,
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+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   Copyright 2023 EqualTo GmbH, 2023 Nicolás Hatcher
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
--- a/bindings/python/LICENSE-MIT.md
+++ b/bindings/python/LICENSE-MIT.md
@@ -0,0 +1,9 @@
+MIT License
+
+Copyright (c) 2023 EqualTo GmbH, 2023 Nicolás Hatcher
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--- a/bindings/python/README.md
+++ b/bindings/python/README.md
@@ -0,0 +1,31 @@
+# IronCalc python bindings
+
+With IronCalc you can create, read and manipulate xlsx files.
+You can manage sheets, add, remove, delete rename.
+You can add cell values, retrieve them and most importantly you can evaluate spreadsheets.
+
+## Installation
+
+```bash
+pip install ironcalc
+```
+
+
+
+
+## Compile and test
+
+To compile this and test it:
+
+```bash
+$ python3 -m venv venv
+$ source venv/bin/activate
+$ pip install maturin
+$ maturin develop
+$ cd examples
+examples $ python example.py
+```
+
+From there if you use `python` you can `import ironcalc`. You can either create a new file, read it from a JSON string or import from Excel.
+
+Hopefully the API is straightforward.
--- a/bindings/python/docs/conf.py
+++ b/bindings/python/docs/conf.py
@@ -0,0 +1,14 @@
+
+project = 'IronCalc'
+author = 'Nicolás Hatcher'
+
+release = '0.1'
+version = '0.1.2'
+
+extensions = ['sphinx.ext.autodoc', 'sphinx.ext.napoleon']
+
+templates_path = ['_templates']
+
+exclude_patterns = []
+
+html_theme = 'alabaster'
--- a/bindings/python/docs/examples/simple.py
+++ b/bindings/python/docs/examples/simple.py
@@ -0,0 +1,8 @@
+import ironcalc as ic
+
+model = ic.create("model", "en", "UTC")
+
+model.set_user_input(0, 1, 1, "=21*2")
+model.evaluate()
+
+assert model.get_formatted_cell_value(0, 1, 1), 42
--- a/bindings/python/docs/index.rst
+++ b/bindings/python/docs/index.rst
@@ -0,0 +1,13 @@
+IronCalc: The democratization of spreadsheets
+=============================================
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+IronCalc is a spreadsheet engine that allows you to create, modify and safe spreadsheets.
+
+A simple example that creates a model, sets a formula, evaluates it and gets the result back:
+
+.. literalinclude:: examples/simple.py
+   :language: python
--- a/bindings/python/pyproject.toml
+++ b/bindings/python/pyproject.toml
@@ -0,0 +1,36 @@
+[project]
+name = "ironcalc"
+version = "0.1.2"
+description = "Create, edit and evaluate Excel spreadsheets"
+requires-python = ">=3.10"
+keywords = [
+  "xlsx",
+  "spreadsheet",
+]
+classifiers = [
+  "License :: OSI Approved :: MIT License",
+  "License :: OSI Approved :: Apache Software License",
+  "Development Status :: 3 - Alpha",
+  "Intended Audience :: Developers",
+  "Operating System :: OS Independent",
+  "Programming Language :: Python :: 3",
+  "Topic :: Software Development :: Libraries",
+  "Topic :: Software Development :: Libraries :: Python Modules",
+  "Office/Business :: Financial :: Spreadsheet",
+]
+authors = [
+  { name = "Nicolás Hatcher", email = "nicolas@theuniverse.today" },
+]
+
+[project.urls]
+Homepage = "https://www.ironcalc.com/"
+Source = "https://github.com/ironcalc/ironcalc"
+Tracker = "https://github.com/ironcalc/ironcalc/issues"
+
+[build-system]
+requires = ["maturin>=1.0,<2.0"]
+build-backend = "maturin"
+
+
+[tool.maturin]
+features = ["pyo3/extension-module"]
--- a/bindings/python/run_examples.sh
+++ b/bindings/python/run_examples.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# Define the directory containing the Python files
+EXAMPLES_DIR="docs/examples"
+
+# Check if the directory exists
+if [ ! -d "$EXAMPLES_DIR" ]; then
+  echo "Directory $EXAMPLES_DIR does not exist."
+  exit 1
+fi
+
+# Iterate over all Python files in the examples directory
+for file in "$EXAMPLES_DIR"/*.py; do
+  # Check if there are any Python files
+  if [ -f "$file" ]; then
+    echo "Running $file..."
+    python "$file"
+    
+    # Check if the script ran successfully
+    if [ $? -ne 0 ]; then
+      echo "Error running $file"
+    else
+      echo "$file ran successfully"
+    fi
+  else
+    echo "No Python files found in $EXAMPLES_DIR"
+    exit 1
+  fi
+done
--- a/bindings/python/run_tests.sh
+++ b/bindings/python/run_tests.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+python -m venv venv
+source venv/bin/activate
+# not sure why this is needed
+pip install patchelf
+pip install maturin
+pip install pytest
+maturin develop
+pytest tests/
--- a/bindings/python/src/lib.rs
+++ b/bindings/python/src/lib.rs
@@ -0,0 +1,259 @@
+use pyo3::exceptions::PyException;
+use pyo3::{create_exception, prelude::*, wrap_pyfunction};
+
+use types::{PySheetProperty, PyStyle};
+use xlsx::base::types::Style;
+use xlsx::base::Model;
+
+use xlsx::export::{save_to_icalc, save_to_xlsx};
+use xlsx::import;
+
+mod types;
+
+create_exception!(_ironcalc, WorkbookError, PyException);
+
+/// This is a model implementing the 'raw' API
+#[pyclass]
+pub struct PyModel {
+    model: Model,
+}
+
+#[pymethods]
+impl PyModel {
+    /// Saves the model to an xlsx file
+    pub fn save_to_xlsx(&self, file: &str) -> PyResult<()> {
+        save_to_xlsx(&self.model, file).map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    /// Saves the model to file in the internal binary ic format
+    pub fn save_to_icalc(&self, file: &str) -> PyResult<()> {
+        save_to_icalc(&self.model, file).map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    /// Evaluates the workbook
+    pub fn evaluate(&mut self) {
+        self.model.evaluate()
+    }
+
+    // Set values
+
+    /// Set an input
+    pub fn set_user_input(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        value: &str,
+    ) -> PyResult<()> {
+        self.model
+            .set_user_input(sheet, row, column, value.to_string())
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn clear_cell_contents(&mut self, sheet: u32, row: i32, column: i32) -> PyResult<()> {
+        self.model
+            .cell_clear_contents(sheet, row, column)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    // Get values
+
+    /// Get formatted value
+    pub fn get_formatted_cell_value(&self, sheet: u32, row: i32, column: i32) -> PyResult<String> {
+        self.model
+            .get_formatted_cell_value(sheet, row, column)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    // Set styles
+    pub fn set_cell_style(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        py_style: &PyStyle,
+    ) -> PyResult<()> {
+        let style: Style = py_style.into();
+        self.model
+            .set_cell_style(sheet, row, column, &style)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    // Get styles
+    pub fn get_cell_style(&self, sheet: u32, row: i32, column: i32) -> PyResult<PyStyle> {
+        let style = self
+            .model
+            .get_style_for_cell(sheet, row, column)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))?;
+        Ok(style.into())
+    }
+
+    // column widths, row heights
+    // insert/delete rows/columns
+
+    pub fn insert_rows(&mut self, sheet: u32, row: i32, row_count: i32) -> PyResult<()> {
+        self.model
+            .insert_rows(sheet, row, row_count)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn insert_columns(&mut self, sheet: u32, column: i32, column_count: i32) -> PyResult<()> {
+        self.model
+            .insert_columns(sheet, column, column_count)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn delete_rows(&mut self, sheet: u32, row: i32, row_count: i32) -> PyResult<()> {
+        self.model
+            .delete_rows(sheet, row, row_count)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn delete_columns(&mut self, sheet: u32, column: i32, column_count: i32) -> PyResult<()> {
+        self.model
+            .delete_columns(sheet, column, column_count)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn get_column_width(&self, sheet: u32, column: i32) -> PyResult<f64> {
+        self.model
+            .get_column_width(sheet, column)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn get_row_height(&self, sheet: u32, row: i32) -> PyResult<f64> {
+        self.model
+            .get_row_height(sheet, row)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn set_column_width(&mut self, sheet: u32, column: i32, width: f64) -> PyResult<()> {
+        self.model
+            .set_column_width(sheet, column, width)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn set_row_height(&mut self, sheet: u32, row: i32, height: f64) -> PyResult<()> {
+        self.model
+            .set_row_height(sheet, row, height)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    // frozen rows/columns
+
+    pub fn get_frozen_columns_count(&self, sheet: u32) -> PyResult<i32> {
+        self.model
+            .get_frozen_columns_count(sheet)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn get_frozen_rows_count(&self, sheet: u32) -> PyResult<i32> {
+        self.model
+            .get_frozen_rows_count(sheet)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn set_frozen_columns_count(&mut self, sheet: u32, column_count: i32) -> PyResult<()> {
+        self.model
+            .set_frozen_columns(sheet, column_count)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn set_frozen_rows_count(&mut self, sheet: u32, row_count: i32) -> PyResult<()> {
+        self.model
+            .set_frozen_rows(sheet, row_count)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    // Manipulate sheets (add/remove/rename/change color)
+    pub fn get_worksheets_properties(&self) -> PyResult<Vec<PySheetProperty>> {
+        Ok(self
+            .model
+            .get_worksheets_properties()
+            .into_iter()
+            .map(|s| PySheetProperty {
+                name: s.name,
+                state: s.state,
+                sheet_id: s.sheet_id,
+                color: s.color,
+            })
+            .collect())
+    }
+
+    pub fn set_sheet_color(&mut self, sheet: u32, color: &str) -> PyResult<()> {
+        self.model
+            .set_sheet_color(sheet, color)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn add_sheet(&mut self, sheet_name: &str) -> PyResult<()> {
+        self.model
+            .add_sheet(sheet_name)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn new_sheet(&mut self) {
+        self.model.new_sheet();
+    }
+
+    pub fn delete_sheet(&mut self, sheet: u32) -> PyResult<()> {
+        self.model
+            .delete_sheet(sheet)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn rename_sheet(&mut self, sheet: u32, new_name: &str) -> PyResult<()> {
+        self.model
+            .rename_sheet_by_index(sheet, new_name)
+            .map_err(|e| WorkbookError::new_err(e.to_string()))
+    }
+
+    pub fn test_panic(&self) -> PyResult<()> {
+        panic!("This function panics for testing panic handling");
+    }
+}
+
+/// Create methods
+
+/// Loads a function from an xlsx file
+#[pyfunction]
+pub fn load_from_xlsx(file_path: &str, locale: &str, tz: &str) -> PyResult<PyModel> {
+    let model = import::load_from_xlsx(file_path, locale, tz)
+        .map_err(|e| WorkbookError::new_err(e.to_string()))?;
+    Ok(PyModel { model })
+}
+
+/// Loads a function from icalc binary representation
+#[pyfunction]
+pub fn load_from_icalc(file_name: &str) -> PyResult<PyModel> {
+    let model =
+        import::load_from_icalc(file_name).map_err(|e| WorkbookError::new_err(e.to_string()))?;
+    Ok(PyModel { model })
+}
+
+/// Creates an empty model
+#[pyfunction]
+pub fn create(name: &str, locale: &str, tz: &str) -> PyResult<PyModel> {
+    let model =
+        Model::new_empty(name, locale, tz).map_err(|e| WorkbookError::new_err(e.to_string()))?;
+    Ok(PyModel { model })
+}
+
+#[pyfunction]
+pub fn test_panic() {
+    panic!("This function panics for testing panic handling");
+}
+
+#[pymodule]
+fn ironcalc(m: &Bound<'_, PyModule>) -> PyResult<()> {
+    // Add the package version to the module
+    m.add("__version__", env!("CARGO_PKG_VERSION"))?;
+
+    // Add the functions to the module using the `?` operator
+    m.add_function(wrap_pyfunction!(create, m)?)?;
+    m.add_function(wrap_pyfunction!(load_from_xlsx, m)?)?;
+    m.add_function(wrap_pyfunction!(load_from_icalc, m)?)?;
+    m.add_function(wrap_pyfunction!(test_panic, m)?)?;
+
+    Ok(())
+}
--- a/bindings/python/src/types.rs
+++ b/bindings/python/src/types.rs
@@ -0,0 +1,428 @@
+use pyo3::prelude::*;
+use xlsx::base::types::{
+    Alignment, Border, BorderItem, BorderStyle, Fill, Font, FontScheme, HorizontalAlignment, Style,
+    VerticalAlignment,
+};
+
+#[derive(Clone)]
+#[pyclass]
+pub struct PySheetProperty {
+    #[pyo3(get)]
+    pub name: String,
+    #[pyo3(get)]
+    pub state: String,
+    #[pyo3(get)]
+    pub sheet_id: u32,
+    #[pyo3(get)]
+    pub color: Option<String>,
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct Cell {
+    #[pyo3(get, set)]
+    pub row: i32,
+    #[pyo3(get, set)]
+    pub column: i32,
+}
+
+#[pyclass(eq, eq_int)]
+#[derive(PartialEq, Clone)]
+pub enum PyHorizontalAlignment {
+    Center,
+    CenterContinuous,
+    Distributed,
+    Fill,
+    General,
+    Justify,
+    Left,
+    Right,
+}
+
+#[pyclass(eq, eq_int)]
+#[derive(PartialEq, Clone)]
+pub enum PyVerticalAlignment {
+    Bottom,
+    Center,
+    Distributed,
+    Justify,
+    Top,
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct PyAlignment {
+    #[pyo3(get)]
+    pub horizontal: PyHorizontalAlignment,
+    #[pyo3(get)]
+    pub vertical: PyVerticalAlignment,
+    #[pyo3(get)]
+    pub wrap_text: bool,
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct PyStyle {
+    #[pyo3(get)]
+    pub alignment: Option<PyAlignment>,
+    #[pyo3(get)]
+    pub num_fmt: String,
+    #[pyo3(get)]
+    pub fill: PyFill,
+    #[pyo3(get)]
+    pub font: PyFont,
+    #[pyo3(get)]
+    pub border: PyBorder,
+    #[pyo3(get)]
+    pub quote_prefix: bool,
+}
+
+#[pyclass(eq, eq_int)]
+#[derive(PartialEq, Clone)]
+pub enum PyBorderStyle {
+    Thin,
+    Medium,
+    Thick,
+    Double,
+    Dotted,
+    SlantDashDot,
+    MediumDashed,
+    MediumDashDotDot,
+    MediumDashDot,
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct PyBorderItem {
+    #[pyo3(get)]
+    pub style: PyBorderStyle,
+    #[pyo3(get)]
+    pub color: Option<String>,
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct PyBorder {
+    #[pyo3(get)]
+    pub diagonal_up: bool,
+    #[pyo3(get)]
+    pub diagonal_down: bool,
+    #[pyo3(get)]
+    pub left: Option<PyBorderItem>,
+    #[pyo3(get)]
+    pub right: Option<PyBorderItem>,
+    #[pyo3(get)]
+    pub top: Option<PyBorderItem>,
+    #[pyo3(get)]
+    pub bottom: Option<PyBorderItem>,
+    #[pyo3(get)]
+    pub diagonal: Option<PyBorderItem>,
+}
+
+#[pyclass(eq, eq_int)]
+#[derive(PartialEq, Clone)]
+pub enum PyFontScheme {
+    Minor,
+    Major,
+    None,
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct PyFont {
+    #[pyo3(get)]
+    pub strike: bool,
+    #[pyo3(get)]
+    pub u: bool,
+    #[pyo3(get)]
+    pub b: bool,
+    #[pyo3(get)]
+    pub i: bool,
+    #[pyo3(get)]
+    pub sz: i32,
+    #[pyo3(get)]
+    pub color: Option<String>,
+    #[pyo3(get)]
+    pub name: String,
+    #[pyo3(get)]
+    pub family: i32,
+    #[pyo3(get)]
+    pub scheme: PyFontScheme,
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct PyFill {
+    #[pyo3(get)]
+    pub pattern_type: String,
+    #[pyo3(get)]
+    pub fg_color: Option<String>,
+    #[pyo3(get)]
+    pub bg_color: Option<String>,
+}
+
+// Conversions from references to Py* types to non-Py types
+
+// Enums
+
+impl From<PyHorizontalAlignment> for HorizontalAlignment {
+    fn from(py_align: PyHorizontalAlignment) -> Self {
+        match py_align {
+            PyHorizontalAlignment::Center => HorizontalAlignment::Center,
+            PyHorizontalAlignment::CenterContinuous => HorizontalAlignment::CenterContinuous,
+            PyHorizontalAlignment::Distributed => HorizontalAlignment::Distributed,
+            PyHorizontalAlignment::Fill => HorizontalAlignment::Fill,
+            PyHorizontalAlignment::General => HorizontalAlignment::General,
+            PyHorizontalAlignment::Justify => HorizontalAlignment::Justify,
+            PyHorizontalAlignment::Left => HorizontalAlignment::Left,
+            PyHorizontalAlignment::Right => HorizontalAlignment::Right,
+        }
+    }
+}
+
+impl From<PyVerticalAlignment> for VerticalAlignment {
+    fn from(py_align: PyVerticalAlignment) -> Self {
+        match py_align {
+            PyVerticalAlignment::Bottom => VerticalAlignment::Bottom,
+            PyVerticalAlignment::Center => VerticalAlignment::Center,
+            PyVerticalAlignment::Distributed => VerticalAlignment::Distributed,
+            PyVerticalAlignment::Justify => VerticalAlignment::Justify,
+            PyVerticalAlignment::Top => VerticalAlignment::Top,
+        }
+    }
+}
+
+impl From<PyFontScheme> for FontScheme {
+    fn from(py_scheme: PyFontScheme) -> Self {
+        match py_scheme {
+            PyFontScheme::Minor => FontScheme::Minor,
+            PyFontScheme::Major => FontScheme::Major,
+            PyFontScheme::None => FontScheme::None,
+        }
+    }
+}
+
+impl From<&PyBorderStyle> for BorderStyle {
+    fn from(py_style: &PyBorderStyle) -> Self {
+        match *py_style {
+            PyBorderStyle::Thin => BorderStyle::Thin,
+            PyBorderStyle::Medium => BorderStyle::Medium,
+            PyBorderStyle::Thick => BorderStyle::Thick,
+            PyBorderStyle::Double => BorderStyle::Double,
+            PyBorderStyle::Dotted => BorderStyle::Dotted,
+            PyBorderStyle::SlantDashDot => BorderStyle::SlantDashDot,
+            PyBorderStyle::MediumDashed => BorderStyle::MediumDashed,
+            PyBorderStyle::MediumDashDotDot => BorderStyle::MediumDashDotDot,
+            PyBorderStyle::MediumDashDot => BorderStyle::MediumDashDot,
+        }
+    }
+}
+
+// Structs
+
+impl From<&PyFill> for Fill {
+    fn from(py_fill: &PyFill) -> Self {
+        Fill {
+            pattern_type: py_fill.pattern_type.clone(),
+            fg_color: py_fill.fg_color.clone(),
+            bg_color: py_fill.bg_color.clone(),
+        }
+    }
+}
+
+impl From<&PyFont> for Font {
+    fn from(py_font: &PyFont) -> Self {
+        Font {
+            strike: py_font.strike,
+            u: py_font.u,
+            b: py_font.b,
+            i: py_font.i,
+            sz: py_font.sz,
+            color: py_font.color.clone(),
+            name: py_font.name.clone(),
+            family: py_font.family,
+            scheme: py_font.scheme.clone().into(),
+        }
+    }
+}
+
+impl From<&PyBorderItem> for BorderItem {
+    fn from(py_item: &PyBorderItem) -> Self {
+        BorderItem {
+            style: (&py_item.style).into(),
+            color: py_item.color.clone(),
+        }
+    }
+}
+
+impl From<&PyBorder> for Border {
+    fn from(py_border: &PyBorder) -> Self {
+        Border {
+            diagonal_up: py_border.diagonal_up,
+            diagonal_down: py_border.diagonal_down,
+            left: py_border.left.as_ref().map(|item| item.into()),
+            right: py_border.right.as_ref().map(|item| item.into()),
+            top: py_border.top.as_ref().map(|item| item.into()),
+            bottom: py_border.bottom.as_ref().map(|item| item.into()),
+            diagonal: py_border.diagonal.as_ref().map(|item| item.into()),
+        }
+    }
+}
+
+impl From<&PyAlignment> for Alignment {
+    fn from(py_align: &PyAlignment) -> Self {
+        Alignment {
+            horizontal: py_align.horizontal.clone().into(),
+            vertical: py_align.vertical.clone().into(),
+            wrap_text: py_align.wrap_text,
+        }
+    }
+}
+
+impl From<&PyStyle> for Style {
+    fn from(py_style: &PyStyle) -> Self {
+        Style {
+            alignment: py_style.alignment.as_ref().map(|a| a.into()),
+            num_fmt: py_style.num_fmt.clone(),
+            fill: (&py_style.fill).into(),
+            font: (&py_style.font).into(),
+            border: (&py_style.border).into(),
+            quote_prefix: py_style.quote_prefix,
+        }
+    }
+}
+
+// From non-Py to Py
+impl From<Fill> for PyFill {
+    fn from(fill: Fill) -> Self {
+        PyFill {
+            pattern_type: fill.pattern_type,
+            fg_color: fill.fg_color,
+            bg_color: fill.bg_color,
+        }
+    }
+}
+
+// From non-Py to Py
+impl From<HorizontalAlignment> for PyHorizontalAlignment {
+    fn from(align: HorizontalAlignment) -> Self {
+        match align {
+            HorizontalAlignment::Center => PyHorizontalAlignment::Center,
+            HorizontalAlignment::CenterContinuous => PyHorizontalAlignment::CenterContinuous,
+            HorizontalAlignment::Distributed => PyHorizontalAlignment::Distributed,
+            HorizontalAlignment::Fill => PyHorizontalAlignment::Fill,
+            HorizontalAlignment::General => PyHorizontalAlignment::General,
+            HorizontalAlignment::Justify => PyHorizontalAlignment::Justify,
+            HorizontalAlignment::Left => PyHorizontalAlignment::Left,
+            HorizontalAlignment::Right => PyHorizontalAlignment::Right,
+        }
+    }
+}
+
+// From non-Py to Py
+impl From<VerticalAlignment> for PyVerticalAlignment {
+    fn from(align: VerticalAlignment) -> Self {
+        match align {
+            VerticalAlignment::Bottom => PyVerticalAlignment::Bottom,
+            VerticalAlignment::Center => PyVerticalAlignment::Center,
+            VerticalAlignment::Distributed => PyVerticalAlignment::Distributed,
+            VerticalAlignment::Justify => PyVerticalAlignment::Justify,
+            VerticalAlignment::Top => PyVerticalAlignment::Top,
+        }
+    }
+}
+
+// From non-Py to Py
+impl From<FontScheme> for PyFontScheme {
+    fn from(scheme: FontScheme) -> Self {
+        match scheme {
+            FontScheme::Minor => PyFontScheme::Minor,
+            FontScheme::Major => PyFontScheme::Major,
+            FontScheme::None => PyFontScheme::None,
+        }
+    }
+}
+
+// From non-Py to Py
+impl From<BorderStyle> for PyBorderStyle {
+    fn from(style: BorderStyle) -> Self {
+        match style {
+            BorderStyle::Thin => PyBorderStyle::Thin,
+            BorderStyle::Medium => PyBorderStyle::Medium,
+            BorderStyle::Thick => PyBorderStyle::Thick,
+            BorderStyle::Double => PyBorderStyle::Double,
+            BorderStyle::Dotted => PyBorderStyle::Dotted,
+            BorderStyle::SlantDashDot => PyBorderStyle::SlantDashDot,
+            BorderStyle::MediumDashed => PyBorderStyle::MediumDashed,
+            BorderStyle::MediumDashDotDot => PyBorderStyle::MediumDashDotDot,
+            BorderStyle::MediumDashDot => PyBorderStyle::MediumDashDot,
+        }
+    }
+}
+
+// From non-Py to Py
+impl From<Font> for PyFont {
+    fn from(font: Font) -> Self {
+        PyFont {
+            strike: font.strike,
+            u: font.u,
+            b: font.b,
+            i: font.i,
+            sz: font.sz,
+            color: font.color,
+            name: font.name,
+            family: font.family,
+            scheme: font.scheme.into(),
+        }
+    }
+}
+
+// From non-Py to Py
+impl From<BorderItem> for PyBorderItem {
+    fn from(item: BorderItem) -> Self {
+        PyBorderItem {
+            style: item.style.into(),
+            color: item.color,
+        }
+    }
+}
+
+// From non-Py to Py
+impl From<Border> for PyBorder {
+    fn from(border: Border) -> Self {
+        PyBorder {
+            diagonal_up: border.diagonal_up,
+            diagonal_down: border.diagonal_down,
+            left: border.left.map(|item| item.into()),
+            right: border.right.map(|item| item.into()),
+            top: border.top.map(|item| item.into()),
+            bottom: border.bottom.map(|item| item.into()),
+            diagonal: border.diagonal.map(|item| item.into()),
+        }
+    }
+}
+
+// From non-Py to Py
+impl From<Alignment> for PyAlignment {
+    fn from(align: Alignment) -> Self {
+        PyAlignment {
+            horizontal: align.horizontal.into(),
+            vertical: align.vertical.into(),
+            wrap_text: align.wrap_text,
+        }
+    }
+}
+
+// From non-Py to Py
+impl From<Style> for PyStyle {
+    fn from(style: Style) -> Self {
+        PyStyle {
+            alignment: style.alignment.map(|a| a.into()),
+            num_fmt: style.num_fmt,
+            fill: style.fill.into(),
+            font: style.font.into(),
+            border: style.border.into(),
+            quote_prefix: style.quote_prefix,
+        }
+    }
+}
--- a/bindings/python/tests/test_create.py
+++ b/bindings/python/tests/test_create.py
@@ -0,0 +1,8 @@
+import ironcalc as ic
+
+def test_simple():
+    model = ic.create("model", "en", "UTC")
+    model.set_user_input(0, 1, 1, "=1+2")
+    model.evaluate()
+
+    assert model.get_formatted_cell_value(0, 1, 1) == "3"
--- a/bindings/wasm/Cargo.toml
+++ b/bindings/wasm/Cargo.toml
@@ -14,7 +14,7 @@ crate-type = ["cdylib"]
 # Uses `../ironcalc/base` when used locally, and uses
 # the inicated version from crates.io when published.
 # https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#multiple-locations
-ironcalc_base = { path = "../../base", version = "0.1" }
+ironcalc_base = { path = "../../base", version = "0.2" }
 serde = { version = "1.0", features = ["derive"] }
 wasm-bindgen = "0.2.92"
 serde-wasm-bindgen = "0.4"
--- a/bindings/wasm/fix_types.py
+++ b/bindings/wasm/fix_types.py
@@ -137,6 +137,54 @@ set_area_border_types = r"""
  setAreaWithBorder(area: Area, border_area: BorderArea): void;
 """

+paste_csv_string = r"""
+/**
+* @param {any} area
+* @param {string} csv
+*/
+  pasteCsvText(area: any, csv: string): void;
+"""
+
+paste_csv_string_types = r"""
+/**
+* @param {Area} area
+* @param {string} csv
+*/
+  pasteCsvText(area: Area, csv: string): void;
+"""
+
+clipboard = r"""
+/**
+* @returns {any}
+*/
+  copyToClipboard(): any;
+"""
+
+clipboard_types = r"""
+/**
+* @returns {Clipboard}
+*/
+  copyToClipboard(): Clipboard;
+"""
+
+paste_from_clipboard = r"""
+/**
+* @param {any} source_range
+* @param {any} clipboard
+* @param {boolean} is_cut
+*/
+  pasteFromClipboard(source_range: any, clipboard: any, is_cut: boolean): void;
+"""
+
+paste_from_clipboard_types = r"""
+/**
+* @param {[number, number, number, number]} source_range
+* @param {ClipboardData} clipboard
+* @param {boolean} is_cut
+*/
+  pasteFromClipboard(source_range: [number, number, number, number], clipboard: ClipboardData, is_cut: boolean): void;
+"""
+
 def fix_types(text):
    text = text.replace(get_tokens_str, get_tokens_str_types)
    text = text.replace(update_style_str, update_style_str_types)
@@ -147,6 +195,9 @@ def fix_types(text):
    text = text.replace(autofill_columns, autofill_columns_types)
    text = text.replace(set_cell_style, set_cell_style_types)
    text = text.replace(set_area_border, set_area_border_types)
+    text = text.replace(paste_csv_string, paste_csv_string_types)
+    text = text.replace(clipboard, clipboard_types)
+    text = text.replace(paste_from_clipboard, paste_from_clipboard_types)
    with open("types.ts") as f:
        types_str = f.read()
        header_types = "{}\n\n{}".format(header, types_str)
--- a/bindings/wasm/src/lib.rs
+++ b/bindings/wasm/src/lib.rs
@@ -4,9 +4,9 @@ use wasm_bindgen::{
 };

 use ironcalc_base::{
-    expressions::{lexer::util::get_tokens as tokenizer, types::Area},
+    expressions::{lexer::util::get_tokens as tokenizer, types::Area, utils::number_to_column},
    types::{CellType, Style},
-    BorderArea, UserModel as BaseModel,
+    BorderArea, ClipboardData, UserModel as BaseModel,
 };

 fn to_js_error(error: String) -> JsError {
@@ -20,6 +20,15 @@ pub fn get_tokens(formula: &str) -> Result<JsValue, JsError> {
    let tokens = tokenizer(formula);
    serde_wasm_bindgen::to_value(&tokens).map_err(JsError::from)
 }
+
+#[wasm_bindgen(js_name = "columnNameFromNumber")]
+pub fn column_name_from_number(column: i32) -> Result<String, JsError> {
+    match number_to_column(column) {
+        Some(c) => Ok(c),
+        None => Err(JsError::new("Invalid column number")),
+    }
+}
+
 #[wasm_bindgen]
 pub struct Model {
    model: BaseModel,
@@ -28,8 +37,8 @@ pub struct Model {
 #[wasm_bindgen]
 impl Model {
    #[wasm_bindgen(constructor)]
-    pub fn new(locale: &str, timezone: &str) -> Result<Model, JsError> {
-        let model = BaseModel::new_empty("workbook", locale, timezone).map_err(to_js_error)?;
+    pub fn new(name: &str, locale: &str, timezone: &str) -> Result<Model, JsError> {
+        let model = BaseModel::new_empty(name, locale, timezone).map_err(to_js_error)?;
        Ok(Model { model })
    }

@@ -88,8 +97,8 @@ impl Model {
    }

    #[wasm_bindgen(js_name = "newSheet")]
-    pub fn new_sheet(&mut self) {
-        self.model.new_sheet()
+    pub fn new_sheet(&mut self) -> Result<(), JsError> {
+        self.model.new_sheet().map_err(to_js_error)
    }

    #[wasm_bindgen(js_name = "deleteSheet")]
@@ -473,4 +482,53 @@ impl Model {
            .map_err(|e| to_js_error(e.to_string()))?;
        Ok(())
    }
+
+    #[wasm_bindgen(js_name = "toBytes")]
+    pub fn to_bytes(&self) -> Vec<u8> {
+        self.model.to_bytes()
+    }
+
+    #[wasm_bindgen(js_name = "getName")]
+    pub fn get_name(&self) -> String {
+        self.model.get_name()
+    }
+
+    #[wasm_bindgen(js_name = "setName")]
+    pub fn set_name(&mut self, name: &str) {
+        self.model.set_name(name);
+    }
+
+    #[wasm_bindgen(js_name = "copyToClipboard")]
+    pub fn copy_to_clipboard(&self) -> Result<JsValue, JsError> {
+        let data = self
+            .model
+            .copy_to_clipboard()
+            .map_err(|e| to_js_error(e.to_string()));
+        data.map(|x| serde_wasm_bindgen::to_value(&x).unwrap())
+    }
+
+    #[wasm_bindgen(js_name = "pasteFromClipboard")]
+    pub fn paste_from_clipboard(
+        &mut self,
+        source_range: JsValue,
+        clipboard: JsValue,
+        is_cut: bool,
+    ) -> Result<(), JsError> {
+        let source_range: (i32, i32, i32, i32) =
+            serde_wasm_bindgen::from_value(source_range).map_err(|e| to_js_error(e.to_string()))?;
+        let clipboard: ClipboardData =
+            serde_wasm_bindgen::from_value(clipboard).map_err(|e| to_js_error(e.to_string()))?;
+        self.model
+            .paste_from_clipboard(source_range, &clipboard, is_cut)
+            .map_err(|e| to_js_error(e.to_string()))
+    }
+
+    #[wasm_bindgen(js_name = "pasteCsvText")]
+    pub fn paste_csv_string(&mut self, area: JsValue, csv: &str) -> Result<(), JsError> {
+        let range: Area =
+            serde_wasm_bindgen::from_value(area).map_err(|e| to_js_error(e.to_string()))?;
+        self.model
+            .paste_csv_string(&range, csv)
+            .map_err(|e| to_js_error(e.to_string()))
+    }
 }
--- a/bindings/wasm/tests/test.mjs
+++ b/bindings/wasm/tests/test.mjs
@@ -2,8 +2,10 @@ import test from 'node:test';
 import assert from 'node:assert'
 import { Model } from "../pkg/wasm.js";

+const DEFAULT_ROW_HEIGHT = 28;
+
 test('Frozen rows and columns', () => {
-    let model = new Model('en', 'UTC');
+    let model = new Model('Workbook1', 'en', 'UTC');
    assert.strictEqual(model.getFrozenRowsCount(0), 0);
    assert.strictEqual(model.getFrozenColumnsCount(0), 0);

@@ -15,14 +17,14 @@ test('Frozen rows and columns', () => {
 });

 test('Row height', () => {
-    let model = new Model('en', 'UTC');
-    assert.strictEqual(model.getRowHeight(0, 3), 21);
+    let model = new Model('Workbook1', 'en', 'UTC');
+    assert.strictEqual(model.getRowHeight(0, 3), DEFAULT_ROW_HEIGHT);

    model.setRowHeight(0, 3, 32);
    assert.strictEqual(model.getRowHeight(0, 3), 32);

    model.undo();
-    assert.strictEqual(model.getRowHeight(0, 3), 21);
+    assert.strictEqual(model.getRowHeight(0, 3), DEFAULT_ROW_HEIGHT);

    model.redo();
    assert.strictEqual(model.getRowHeight(0, 3), 32);
@@ -32,7 +34,7 @@ test('Row height', () => {
 });

 test('Evaluates correctly', (t) => {
-    const model = new Model('en', 'UTC');
+    const model = new Model('Workbook1', 'en', 'UTC');
    model.setUserInput(0, 1, 1, "23");
    model.setUserInput(0, 1, 2, "=A1*3+1");

@@ -41,7 +43,7 @@ test('Evaluates correctly', (t) => {
 });

 test('Styles work', () => {
-    const model = new Model('en', 'UTC');
+    const model = new Model('Workbook1', 'en', 'UTC');
    let style = model.getCellStyle(0, 1, 1);
    assert.deepEqual(style, {
        num_fmt: 'general',
@@ -74,7 +76,7 @@ test('Styles work', () => {
 });

 test("Add sheets", (t) => {
-    const model = new Model('en', 'UTC');
+    const model = new Model('Workbook1', 'en', 'UTC');
    model.newSheet();
    model.renameSheet(1, "NewName");
    let props = model.getWorksheetsProperties();
@@ -92,7 +94,7 @@ test("Add sheets", (t) => {
 });

 test("invalid sheet index throws an exception", () => {
-    const model = new Model('en', 'UTC');
+    const model = new Model('Workbook1', 'en', 'UTC');
    assert.throws(() => {
        model.setRowHeight(1, 1, 100);
    }, {
@@ -102,7 +104,7 @@ test("invalid sheet index throws an exception", () => {
 });

 test("invalid column throws an exception", () => {
-    const model = new Model('en', 'UTC');
+    const model = new Model('Workbook1', 'en', 'UTC');
    assert.throws(() => {
        model.setRowHeight(0, -1, 100);
    }, {
@@ -112,7 +114,7 @@ test("invalid column throws an exception", () => {
 });

 test("floating column numbers get truncated", () => {
-    const model = new Model('en', 'UTC');
+    const model = new Model('Workbook1', 'en', 'UTC');
    model.setRowHeight(0.8, 5.2, 100.5);

    assert.strictEqual(model.getRowHeight(0.11, 5.99), 100.5);
@@ -120,7 +122,7 @@ test("floating column numbers get truncated", () => {
 });

 test("autofill", () => {
-    const model = new Model('en', 'UTC');
+    const model = new Model('Workbook1', 'en', 'UTC');
    model.setUserInput(0, 1, 1, "23");
    model.autoFillRows({sheet: 0, row: 1, column: 1, width: 1, height: 1}, 2);

--- a/bindings/wasm/types.ts
+++ b/bindings/wasm/types.ts
@@ -133,20 +133,6 @@ interface CellStyleFont {
  scheme: string;
 }

-// export enum BorderType {
-//   BorderAll,
-//   BorderInner,
-//   BorderCenterH,
-//   BorderCenterV,
-//   BorderOuter,
-//   BorderNone,
-//   BorderTop,
-//   BorderRight,
-//   BorderBottom,
-//   BorderLeft,
-//   None,
-// }
-
 export interface BorderOptions {
  color: string;
  style: BorderStyle;
@@ -219,3 +205,23 @@ export interface SelectedView {
  top_row: number;
  left_column: number;
 }
+
+// type ClipboardData = {
+//   [row: number]: {
+//       [column: number]: ClipboardCell;
+//   };
+// };
+
+// type ClipboardData = Record<string, Record <string, ClipboardCell>>;
+type ClipboardData = Map<number, Map <number, ClipboardCell>>;
+
+export interface ClipboardCell {
+  text: string;
+  style: CellStyle;
+}
+
+export interface Clipboard {
+  csv: string;
+  data: ClipboardData;
+  range: [number, number, number, number];
+}
--- a/webapp/.gitignore
+++ b/webapp/.gitignore
@@ -1,3 +1,2 @@
 node_modules/*
 dist/*
-example.json
--- a/webapp/.storybook/main.ts
+++ b/webapp/.storybook/main.ts
@@ -1,21 +0,0 @@
-import type { StorybookConfig } from '@storybook/react-vite';
-
-const config: StorybookConfig = {
-  stories: ['../src/**/*.mdx', '../src/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
-  addons: [
-    '@storybook/addon-links',
-    '@storybook/addon-essentials',
-    '@storybook/addon-onboarding',
-    '@storybook/addon-interactions',
-    '@storybook/addon-mdx-gfm',
-    '@chromatic-com/storybook'
-  ],
-  framework: {
-    name: '@storybook/react-vite',
-    options: {},
-  },
-  docs: {
-    autodocs: 'tag',
-  },
-};
-export default config;
--- a/webapp/.storybook/preview.tsx
+++ b/webapp/.storybook/preview.tsx
@@ -1,29 +0,0 @@
-import type { Preview } from '@storybook/react';
-import i18n from '../src/i18n';
-import { I18nextProvider } from 'react-i18next';
-import React from 'react';
-
-
-const withI18next = (Story: any) => {
-  return (
-      <I18nextProvider i18n={i18n}>
-        <Story />
-      </I18nextProvider>
-  );
-};
-
-const preview: Preview = {
-  parameters: {
-    actions: { argTypesRegex: '^on[A-Z].*' },
-    controls: {
-      matchers: {
-        color: /(background|color)$/i,
-        date: /Date$/i,
-      },
-    },
-  },
-};
-
-
-export const decorators = [withI18next];
-export default preview;
--- a/webapp/README.md
+++ b/webapp/README.md
@@ -1,21 +1,58 @@
 # IronCalc Web App

+The webapp is build with React and TypeScript. We use icons from [Lucide](https://lucide.dev/)
+
 ## Build

+First thing build the wasm is the `../bindings/wasm` folder.
+
+If you have nodejs installed you just need to:
+
 ```bash
 npm install
 ```

 ## Local development

+
 ```bash
 npm run dev
 ```

-# Deploy
+## Linter and formatting
+
+We use [biome](https://biomejs.dev/):
+
+```
+npm run check
+```
+
+Will check for linter and formatting issues.
+
+## Testing
+
+We use vitest. Simply:
+
+```
+npm run test
+```
+
+Warning: There is only the testing infrastructure in place.
+
+## Deploy
+
+Deploying is a bit of a manual hassle right now:
+To build a deployable frontend:

 ```bash
-npm install
 npm run build
 ```

+Please copy the `inroncalc.svg` icon and the models you want to have as 'examples' in the internal 'ic' format.
+I normally compress the wasm and js files with brotli
+
+```
+brotli wasm_bg-*****.wasm
+```
+
+Copy to the final destination and you are good to go.
--- a/webapp/biome.json
+++ b/webapp/biome.json
@@ -0,0 +1,18 @@
+{
+  "organizeImports": { "enabled": true },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "correctness": { "noUnusedImports": "error" }
+    }
+  },
+  "formatter": {
+    "indentStyle": "space",
+    "indentWidth": 2
+  },
+  "css": {
+    "formatter": {
+      "enabled": true
+    }
+  }
+}
--- a/webapp/example.ic
+++ b/webapp/example.ic
--- a/webapp/index.html
+++ b/webapp/index.html
@@ -2,7 +2,7 @@
 <html lang="en">
  <head>
    <meta charset="UTF-8" />
-    <!-- <link rel="icon" type="image/svg+xml" href="/vite.svg" /> -->
+    <link rel="icon" type="image/svg+xml" href="/ironcalc.svg" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <!-- <meta name="theme-color" content="#1bb566"> -->
    <meta name="theme-color" media="(prefers-color-scheme: light)" content="#F2994A" />
@@ -12,5 +12,6 @@
  <body>
    <div id="root"></div>
    <script type="module" src="/src/main.tsx"></script>
+    <script defer data-domain="app.ironcalc.com" src="https://plausible.io/js/script.js"></script>
  </body>
 </html>
--- a/webapp/jest.config.ts
+++ b/webapp/jest.config.ts
@@ -1,15 +0,0 @@
-import type { Config } from "jest";
-// import {defaults} from 'jest-config';
-
-const config: Config = {
-  // testMatch:["**.jest.mjs"],
-  moduleFileExtensions: ["js", "ts", "mts", "mjs"],
-  transform: {
-    "^.+\\.[jt]s?$": "ts-jest",
-  },
-  moduleNameMapper: {
-    "^@ironcalc/wasm$": "<rootDir>/node_modules/@ironcalc/nodejs/"
-  },
-};
-
-export default config;
--- a/webapp/package-lock.json
+++ b/webapp/package-lock.json
--- a/webapp/package.json
+++ b/webapp/package.json
@@ -1,57 +1,37 @@
 {
  "name": "frontend",
  "private": true,
-  "version": "0.1.3",
+  "version": "0.2.0",
  "type": "module",
  "scripts": {
-    "restore": "cp node_modules/@ironcalc/wasm/wasm_bg.wasm node_modules/.vite/deps/",
    "dev": "vite",
-    "test": "jest",
    "build": "tsc && vite build",
-    "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
    "preview": "vite preview",
-    "storybook": "storybook dev -p 6006",
-    "build-storybook": "storybook build"
+    "check": "biome check ./src",
+    "check-write": "biome check --write ./src",
+    "test": "vitest run"
  },
  "dependencies": {
    "@emotion/react": "^11.11.4",
    "@emotion/styled": "^11.11.5",
    "@ironcalc/wasm": "file:../bindings/wasm/pkg",
    "@mui/material": "^5.15.15",
-    "@storybook/test": "^8.0.8",
    "i18next": "^23.11.1",
-    "lucide-react": "^0.375.0",
+    "lucide-react": "^0.427.0",
    "react": "^18.2.0",
    "react-colorful": "^5.6.1",
    "react-dom": "^18.2.0",
    "react-i18next": "^13.5.0"
  },
  "devDependencies": {
-    "@chromatic-com/storybook": "^1.3.2",
-    "@storybook/addon-essentials": "^8.0.8",
-    "@storybook/addon-interactions": "^8.0.8",
-    "@storybook/addon-links": "^8.0.8",
-    "@storybook/addon-mdx-gfm": "^8.0.8",
-    "@storybook/addon-onboarding": "^8.0.8",
-    "@storybook/blocks": "^8.0.8",
-    "@storybook/react": "^8.0.8",
-    "@storybook/react-vite": "^8.0.8",
-    "@types/jest": "^29.5.12",
+    "@biomejs/biome": "1.8.3",
    "@types/react": "^18.2.75",
    "@types/react-dom": "^18.2.24",
-    "@typescript-eslint/eslint-plugin": "^6.21.0",
-    "@typescript-eslint/parser": "^6.21.0",
    "@vitejs/plugin-react": "^4.2.1",
-    "eslint": "^8.57.0",
-    "eslint-plugin-react-hooks": "^4.6.0",
-    "eslint-plugin-react-refresh": "^0.4.6",
-    "eslint-plugin-storybook": "^0.6.15",
-    "jest": "^29.7.0",
-    "storybook": "^8.0.8",
-    "ts-jest": "^29.1.2",
    "ts-node": "^10.9.2",
    "typescript": "^5.4.5",
    "vite": "^5.2.8",
-    "vite-plugin-svgr": "^4.2.0"
+    "vite-plugin-svgr": "^4.2.0",
+    "vitest": "^2.0.5"
  }
 }
--- a/webapp/src/App.css
+++ b/webapp/src/App.css
@@ -1,6 +1,10 @@
 #root {
-    position: absolute;
-    inset: 10px;
-    border: 1px solid #AAA;
-    border-radius: 4px;
-}
+  position: absolute;
+  inset: 0px;
+  margin: 0px;
+  border: none;
+}
+html,
+body {
+  overscroll-behavior: none;
+}
--- a/webapp/src/App.tsx
+++ b/webapp/src/App.tsx
@@ -1,37 +1,128 @@
 import "./App.css";
 import Workbook from "./components/workbook";
 import "./i18n";
-import { useEffect, useState } from "react";
+import styled from "@emotion/styled";
 import init, { Model } from "@ironcalc/wasm";
+import { useEffect, useState } from "react";
+import { FileBar } from "./AppComponents/FileBar";
+import { get_model, uploadFile } from "./AppComponents/rpc";
+import {
+  createNewModel,
+  deleteSelectedModel,
+  loadModelFromStorageOrCreate,
+  saveModelToStorage,
+  saveSelectedModelInStorage,
+  selectModelFromStorage,
+} from "./AppComponents/storage";
 import { WorkbookState } from "./components/workbookState";
+import { IronCalcIcon } from "./icons";

 function App() {
  const [model, setModel] = useState<Model | null>(null);
  const [workbookState, setWorkbookState] = useState<WorkbookState | null>(
-    null
+    null,
  );
+
  useEffect(() => {
    async function start() {
      await init();
-      const model_bytes = new Uint8Array(await (await fetch("./example.ic")).arrayBuffer());
-      const _model = Model.from_bytes(model_bytes);
-      // const _model = new Model("en", "UTC");
-      if (!model) setModel(_model);
-      if (!workbookState) setWorkbookState(new WorkbookState());
+      const queryString = window.location.search;
+      const urlParams = new URLSearchParams(queryString);
+      const modelHash = urlParams.get("model");
+      // If there is a model name ?model=modelHash we try to load it
+      // if there is not, or the loading failed we load an empty model
+      if (modelHash) {
+        // Get a remote model
+        try {
+          const model_bytes = await get_model(modelHash);
+          const importedModel = Model.from_bytes(model_bytes);
+          localStorage.removeItem("selected");
+          setModel(importedModel);
+        } catch (e) {
+          alert("Model not found, or failed to load");
+        }
+      } else {
+        // try to load from local storage
+        const newModel = loadModelFromStorageOrCreate();
+        setModel(newModel);
+      }
+      setWorkbookState(new WorkbookState());
    }
    start();
  }, []);

  if (!model || !workbookState) {
-    return <div>Loading</div>;
+    return (
+      <Loading>
+        <IronCalcIcon style={{ width: 24, height: 24, marginBottom: 16 }} />
+        <div>Loading IronCalc</div>
+      </Loading>
+    );
  }

+  // We try to save the model every second
+  setInterval(() => {
+    const queue = model.flushSendQueue();
+    if (queue.length !== 1) {
+      saveSelectedModelInStorage(model);
+    }
+  }, 1000);
+
  // We could use context for model, but the problem is that it should initialized to null.
  // Passing the property down makes sure it is always defined.
+
  return (
-    <Workbook model={model} workbookState={workbookState} />
+    <Wrapper>
+      <FileBar
+        model={model}
+        onModelUpload={async (arrayBuffer: ArrayBuffer, fileName: string) => {
+          const blob = await uploadFile(arrayBuffer, fileName);
+
+          const bytes = new Uint8Array(await blob.arrayBuffer());
+          const newModel = Model.from_bytes(bytes);
+          saveModelToStorage(newModel);
+
+          setModel(newModel);
+        }}
+        newModel={() => {
+          setModel(createNewModel());
+        }}
+        setModel={(uuid: string) => {
+          const newModel = selectModelFromStorage(uuid);
+          if (newModel) {
+            setModel(newModel);
+          }
+        }}
+        onDelete={() => {
+          const newModel = deleteSelectedModel();
+          if (newModel) {
+            setModel(newModel);
+          }
+        }}
+      />
+      <Workbook model={model} workbookState={workbookState} />
+    </Wrapper>
  );
 }

-export default App;
+const Wrapper = styled("div")`
+  margin: 0px;
+  padding: 0px;
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  position: absolute;
+`;

+const Loading = styled("div")`
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-family: 'Inter';
+  font-size: 14px;
+`;
+
+export default App;
--- a/webapp/src/AppComponents/FileBar.tsx
+++ b/webapp/src/AppComponents/FileBar.tsx
@@ -0,0 +1,124 @@
+import styled from "@emotion/styled";
+import type { Model } from "@ironcalc/wasm";
+import { CircleCheck } from "lucide-react";
+import { useRef, useState } from "react";
+import { IronCalcIcon, IronCalcLogo } from "./../icons";
+import { FileMenu } from "./FileMenu";
+import { ShareButton } from "./ShareButton";
+import { WorkbookTitle } from "./WorkbookTitle";
+import { downloadModel, shareModel } from "./rpc";
+import { updateNameSelectedWorkbook } from "./storage";
+
+export function FileBar(properties: {
+  model: Model;
+  newModel: () => void;
+  setModel: (key: string) => void;
+  onModelUpload: (blob: ArrayBuffer, fileName: string) => Promise<void>;
+  onDelete: () => void;
+}) {
+  const hiddenInputRef = useRef<HTMLInputElement>(null);
+  const [toast, setToast] = useState(false);
+  return (
+    <FileBarWrapper>
+      <StyledDesktopLogo />
+      <StyledIronCalcIcon />
+      <Divider />
+      <FileMenu
+        newModel={properties.newModel}
+        setModel={properties.setModel}
+        onModelUpload={properties.onModelUpload}
+        onDownload={async () => {
+          const model = properties.model;
+          const bytes = model.toBytes();
+          const fileName = model.getName();
+          await downloadModel(bytes, fileName);
+        }}
+        onDelete={properties.onDelete}
+      />
+      <WorkbookTitle
+        name={properties.model.getName()}
+        onNameChange={(name) => {
+          properties.model.setName(name);
+          updateNameSelectedWorkbook(properties.model, name);
+        }}
+      />
+      <input
+        ref={hiddenInputRef}
+        type="text"
+        style={{ position: "absolute", left: -9999, top: -9999 }}
+      />
+      <div style={{ marginLeft: "auto" }}>
+        {toast ? (
+          <Toast>
+            <CircleCheck style={{ width: 12 }} />
+            <span
+              style={{ marginLeft: 8, marginRight: 12, fontFamily: "Inter" }}
+            >
+              URL copied to clipboard
+            </span>
+          </Toast>
+        ) : (
+          ""
+        )}
+      </div>
+      <ShareButton
+        onClick={async () => {
+          const model = properties.model;
+          const bytes = model.toBytes();
+          const fileName = model.getName();
+          const hash = await shareModel(bytes, fileName);
+          const value = `${location.origin}/?model=${hash}`;
+          if (hiddenInputRef.current) {
+            hiddenInputRef.current.value = value;
+            hiddenInputRef.current.select();
+            document.execCommand("copy");
+            setToast(true);
+            setTimeout(() => setToast(false), 5000);
+          }
+          console.log(value);
+        }}
+      />
+    </FileBarWrapper>
+  );
+}
+
+const StyledDesktopLogo = styled(IronCalcLogo)`
+  width: 120px;
+  margin-left: 10px;
+  @media (max-width: 769px) {
+    display: none;
+  }
+`;
+
+const StyledIronCalcIcon = styled(IronCalcIcon)`
+  width: 36px;
+  margin-left: 10px;
+  @media (min-width: 769px) {
+    display: none;
+  }
+`;
+
+const Toast = styled("div")`
+  font-weight: 400;
+  font-size: 12px;
+  color: #9e9e9e;
+  display: flex;
+  align-items: center;
+`;
+
+const Divider = styled("div")`
+  margin: 10px;
+  height: 12px;
+  border-left: 1px solid #e0e0e0;
+`;
+
+const FileBarWrapper = styled("div")`
+  height: 60px;
+  width: 100%;
+  background: #fff;
+  display: flex;
+  align-items: center;
+  border-bottom: 1px solid #e0e0e0;
+  position: relative;
+  justify-content: space-between;
+`;
--- a/webapp/src/AppComponents/FileMenu.tsx
+++ b/webapp/src/AppComponents/FileMenu.tsx
@@ -0,0 +1,184 @@
+import styled from "@emotion/styled";
+import { Menu, MenuItem, Modal } from "@mui/material";
+import { FileDown, FileUp, Plus, Trash2 } from "lucide-react";
+import { useRef, useState } from "react";
+import { UploadFileDialog } from "./UploadFileDialog";
+import { getModelsMetadata, getSelectedUuid } from "./storage";
+
+export function FileMenu(props: {
+  newModel: () => void;
+  setModel: (key: string) => void;
+  onDownload: () => void;
+  onModelUpload: (blob: ArrayBuffer, fileName: string) => Promise<void>;
+  onDelete: () => void;
+}) {
+  const [isMenuOpen, setMenuOpen] = useState(false);
+  const [isImportMenuOpen, setImportMenuOpen] = useState(false);
+  const anchorElement = useRef<HTMLDivElement>(null);
+  const models = getModelsMetadata();
+  const uuids = Object.keys(models);
+  const selectedUuid = getSelectedUuid();
+
+  const elements = [];
+  for (const uuid of uuids) {
+    elements.push(
+      <MenuItemWrapper
+        key={uuid}
+        onClick={() => {
+          props.setModel(uuid);
+          setMenuOpen(false);
+        }}
+      >
+        <span style={{ width: "20px" }}>
+          {uuid === selectedUuid ? "•" : ""}
+        </span>
+        <MenuItemText
+          style={{
+            maxWidth: "240px",
+            overflow: "hidden",
+            textOverflow: "ellipsis",
+          }}
+        >
+          {models[uuid]}
+        </MenuItemText>
+      </MenuItemWrapper>,
+    );
+  }
+
+  return (
+    <>
+      <FileMenuWrapper
+        onClick={(): void => setMenuOpen(true)}
+        ref={anchorElement}
+      >
+        File
+      </FileMenuWrapper>
+      <Menu
+        open={isMenuOpen}
+        onClose={(): void => setMenuOpen(false)}
+        anchorEl={anchorElement.current}
+        // anchorOrigin={properties.anchorOrigin}
+      >
+        <MenuItemWrapper onClick={props.newModel}>
+          <StyledPlus />
+          <MenuItemText>New</MenuItemText>
+        </MenuItemWrapper>
+        <MenuItemWrapper
+          onClick={() => {
+            setImportMenuOpen(true);
+            setMenuOpen(false);
+          }}
+        >
+          <StyledFileUp />
+          <MenuItemText>Import</MenuItemText>
+        </MenuItemWrapper>
+        <MenuItemWrapper>
+          <StyledFileDown />
+          <MenuItemText onClick={props.onDownload}>
+            Download (.xlsx)
+          </MenuItemText>
+        </MenuItemWrapper>
+        <MenuItemWrapper>
+          <StyledTrash />
+          <MenuItemText
+            onClick={() => {
+              props.onDelete();
+              setMenuOpen(false);
+            }}
+          >
+            Delete workbook
+          </MenuItemText>
+        </MenuItemWrapper>
+        <MenuDivider />
+        {elements}
+      </Menu>
+      <Modal
+        open={isImportMenuOpen}
+        onClose={() => {
+          const root = document.getElementById("root");
+          if (root) {
+            root.style.filter = "";
+          }
+          setImportMenuOpen(false);
+        }}
+        aria-labelledby="modal-modal-title"
+        aria-describedby="modal-modal-description"
+      >
+        <>
+          <UploadFileDialog
+            onClose={() => {
+              const root = document.getElementById("root");
+              if (root) {
+                root.style.filter = "";
+              }
+              setImportMenuOpen(false);
+            }}
+            onModelUpload={props.onModelUpload}
+          />
+        </>
+      </Modal>
+    </>
+  );
+}
+
+const StyledPlus = styled(Plus)`
+  width: 16px;
+  height: 16px;
+  color: #333333;
+  padding-right: 10px;
+`;
+
+const StyledFileDown = styled(FileDown)`
+  width: 16px;
+  height: 16px;
+  color: #333333;
+  padding-right: 10px;
+`;
+
+const StyledFileUp = styled(FileUp)`
+  width: 16px;
+  height: 16px;
+  color: #333333;
+  padding-right: 10px;
+`;
+
+const StyledTrash = styled(Trash2)`
+  width: 16px;
+  height: 16px;
+  color: #333333;
+  padding-right: 10px;
+`;
+
+const MenuDivider = styled("div")`
+  width: 80%;
+  margin: auto;
+  margin-top: 8px;
+  margin-bottom: 8px;
+  border-top: 1px solid #e0e0e0;
+`;
+
+const MenuItemText = styled("div")`
+  color: #000;
+  font-size: 12px;
+`;
+
+const MenuItemWrapper = styled(MenuItem)`
+  display: flex;
+  justify-content: flex-start;
+  font-size: 14px;
+  width: 100%;
+`;
+
+const FileMenuWrapper = styled("div")`
+  display: flex;
+  align-items: center;
+  font-size: 12px;
+  font-family: Inter;
+  padding: 10px;
+  height: 20px;
+  border-radius: 4px;
+  cursor: pointer;
+  &:hover {
+    background-color: #f2f2f2;
+  }
+`;
--- a/webapp/src/AppComponents/ShareButton.tsx
+++ b/webapp/src/AppComponents/ShareButton.tsx
@@ -0,0 +1,30 @@
+import styled from "@emotion/styled";
+import { Share2 } from "lucide-react";
+
+export function ShareButton(properties: { onClick: () => void }) {
+  const { onClick } = properties;
+  return (
+    <Wrapper onClick={onClick} onKeyDown={() => {}}>
+      <Share2 style={{ width: "16px", height: "16px", marginRight: "10px" }} />
+      <span>Share</span>
+    </Wrapper>
+  );
+}
+
+const Wrapper = styled("div")`
+  cursor: pointer;
+  color: #ffffff;
+  background: #f2994a;
+  padding: 0px 10px;
+  height: 36px;
+  line-height: 36px;
+  border-radius: 4px;
+  margin-right: 10px;
+  display: flex;
+  align-items: center;
+  font-family: "Inter";
+  font-size: 14px;
+  &:hover {
+    background: #d68742;
+  }
+`;
--- a/webapp/src/AppComponents/UploadFileDialog.tsx
+++ b/webapp/src/AppComponents/UploadFileDialog.tsx
@@ -0,0 +1,271 @@
+import styled from "@emotion/styled";
+import { BookOpen, FileUp } from "lucide-react";
+import { type DragEvent, useRef, useState } from "react";
+
+export function UploadFileDialog(properties: {
+  onClose: () => void;
+  onModelUpload: (blob: ArrayBuffer, fileName: string) => Promise<void>;
+}) {
+  const [hover, setHover] = useState(false);
+  const [message, setMessage] = useState("");
+  const fileInputRef = useRef<HTMLInputElement>(null);
+
+  const { onModelUpload } = properties;
+
+  const handleClose = () => {
+    properties.onClose();
+  };
+
+  const handleDragEnter = (event: DragEvent<HTMLDivElement>) => {
+    event.preventDefault();
+    event.stopPropagation();
+    setHover(true);
+  };
+
+  const handleDragOver = (event: DragEvent<HTMLDivElement>) => {
+    event.preventDefault();
+    event.stopPropagation();
+    event.dataTransfer.dropEffect = "copy";
+    setHover(true);
+  };
+
+  const handleDragLeave = (event: DragEvent<HTMLDivElement>) => {
+    event.preventDefault();
+    event.stopPropagation();
+    setHover(false);
+  };
+
+  const handleDrop = (event: DragEvent<HTMLDivElement>) => {
+    event.preventDefault();
+    event.stopPropagation();
+
+    const dt = event.dataTransfer;
+    const items = dt.items;
+
+    if (items) {
+      // Use DataTransferItemList to access the file(s)
+      for (let i = 0; i < items.length; i++) {
+        // If dropped items aren't files, skip them
+        if (items[i].kind === "file") {
+          const file = items[i].getAsFile();
+          if (file) {
+            handleFileUpload(file);
+            return;
+          }
+        }
+      }
+    } else {
+      const files = dt.files;
+      if (files.length > 0) {
+        handleFileUpload(files[0]);
+      }
+    }
+  };
+
+  const handleFileUpload = (file: File) => {
+    setMessage(`Uploading ${file.name}...`);
+
+    // Read the file as ArrayBuffer
+    const reader = new FileReader();
+    reader.onload = async () => {
+      try {
+        await onModelUpload(reader.result as ArrayBuffer, file.name);
+        handleClose();
+      } catch (e) {
+        console.log("error", e);
+        setMessage(`${e}`);
+      }
+    };
+    reader.readAsArrayBuffer(file);
+  };
+
+  const root = document.getElementById("root");
+  if (root) {
+    root.style.filter = "blur(4px)";
+  }
+  return (
+    <UploadDialog>
+      <UploadTitle>
+        <span style={{ flexGrow: 2, marginLeft: 12 }}>
+          Import an .xlsx file
+        </span>
+        <Cross
+          style={{ marginRight: 12 }}
+          onClick={handleClose}
+          onKeyDown={() => {}}
+        >
+          <svg
+            width="16"
+            height="16"
+            viewBox="0 0 16 16"
+            fill="none"
+            xmlns="http://www.w3.org/2000/svg"
+          >
+            <title>Close</title>
+            <path
+              d="M12 4.5L4 12.5"
+              stroke="#333333"
+              strokeLinecap="round"
+              strokeLinejoin="round"
+            />
+            <path
+              d="M4 4.5L12 12.5"
+              stroke="#333333"
+              strokeLinecap="round"
+              strokeLinejoin="round"
+            />
+          </svg>
+        </Cross>
+      </UploadTitle>
+      {message === "" ? (
+        <DropZone
+          onDragEnter={handleDragEnter}
+          onDragOver={handleDragOver}
+          onDragLeave={handleDragLeave}
+          onDragExit={handleDragLeave}
+          onDrop={handleDrop}
+        >
+          {!hover ? (
+            <>
+              <div style={{ flexGrow: 2 }} />
+              <div>
+                <FileUp
+                  style={{
+                    width: 16,
+                    color: "#EFAA6D",
+                    backgroundColor: "#F2994A1A",
+                    padding: "2px 4px",
+                    borderRadius: 4,
+                  }}
+                />
+              </div>
+              <div style={{ fontSize: 12 }}>
+                <span style={{ color: "#333333" }}>
+                  Drag and drop a file here or{" "}
+                </span>
+                <input
+                  ref={fileInputRef}
+                  type="file"
+                  multiple
+                  accept="*"
+                  style={{ display: "none" }}
+                  onChange={(event) => {
+                    const files = event.target.files;
+                    if (files) {
+                      for (const file of files) {
+                        handleFileUpload(file);
+                      }
+                    }
+                  }}
+                />
+                <DocLink
+                  onClick={() => {
+                    if (fileInputRef.current) {
+                      fileInputRef.current.click();
+                    }
+                  }}
+                >
+                  click to browse
+                </DocLink>
+              </div>
+              <div style={{ flexGrow: 2 }} />
+            </>
+          ) : (
+            <>
+              <div style={{ flexGrow: 2 }} />
+              <div>Drop file here</div>
+              <div style={{ flexGrow: 2 }} />
+            </>
+          )}
+        </DropZone>
+      ) : (
+        <DropZone>
+          <>
+            <div style={{ flexGrow: 2 }} />
+            <div>{message}</div>
+            <div style={{ flexGrow: 2 }} />
+          </>
+        </DropZone>
+      )}
+
+      <UploadFooter>
+        <BookOpen
+          style={{ width: 16, height: 16, marginLeft: 12, marginRight: 8 }}
+        />
+        <span>Learn more about importing files into IronCalc</span>
+      </UploadFooter>
+    </UploadDialog>
+  );
+}
+
+const Cross = styled("div")`
+  &:hover {
+    background-color: #f5f5f5;
+  }
+  border-radius: 4px;
+  height: 16px;
+  width: 16px;
+`;
+
+const DocLink = styled("span")`
+  color: #f2994a;
+  text-decoration: underline;
+  &:hover {
+    font-weight: bold;
+  }
+`;
+
+const UploadFooter = styled("div")`
+  height: 40px;
+  border-top: 1px solid #e0e0e0;
+  font-size: 12px;
+  font-weight: 400;
+  color: #757575;
+  display: flex;
+  align-items: center;
+`;
+
+const UploadTitle = styled("div")`
+  display: flex;
+  align-items: center;
+  border-bottom: 1px solid #e0e0e0;
+  height: 40px;
+  font-size: 14px;
+  font-weight: 500;
+`;
+
+const UploadDialog = styled("div")`
+  display: flex;
+  flex-direction: column;
+  position: absolute;
+  left: 50%;
+  top: 50%;
+  transform: translate(-50%, -50%);
+  width: 455px;
+  height: 285px;
+  background: #fff;
+  border: 1px solid #e0e0e0;
+  border-radius: 8px;
+  box-shadow: 0px 1px 3px 0px #0000001a;
+  font-family: Inter;
+`;
+
+const DropZone = styled("div")`
+  flex-grow: 2;
+  border-radius: 10px;
+  text-align: center;
+  margin: 12px;
+  color: #aaa;
+  font-family: Arial, sans-serif;
+  cursor: pointer;
+  background-color: #faebd7;
+  border: 1px dashed #f2994a;
+  background: linear-gradient(
+    180deg,
+    rgba(242, 153, 74, 0.08) 0%,
+    rgba(242, 153, 74, 0) 100%
+  );
+  display: flex;
+  flex-direction: column;
+  vertical-align: center;
+`;
--- a/webapp/src/AppComponents/WorkbookTitle.tsx
+++ b/webapp/src/AppComponents/WorkbookTitle.tsx
@@ -0,0 +1,104 @@
+import styled from "@emotion/styled";
+import { type ChangeEvent, useEffect, useRef, useState } from "react";
+
+export function WorkbookTitle(props: {
+  name: string;
+  onNameChange: (name: string) => void;
+}) {
+  const [width, setWidth] = useState(0);
+  const [value, setValue] = useState(props.name);
+  const mirrorDivRef = useRef<HTMLDivElement>(null);
+
+  const handleChange = (event: ChangeEvent<HTMLTextAreaElement>) => {
+    setValue(event.target.value);
+    if (mirrorDivRef.current) {
+      setWidth(mirrorDivRef.current.scrollWidth);
+    }
+  };
+
+  useEffect(() => {
+    if (mirrorDivRef.current) {
+      setWidth(mirrorDivRef.current.scrollWidth);
+    }
+  }, []);
+
+  useEffect(() => {
+    setValue(props.name);
+  }, [props.name]);
+
+  return (
+    <div
+      style={{
+        position: "absolute",
+        left: "50%",
+        textAlign: "center",
+        transform: "translateX(-50%)",
+        // height: "60px",
+        // lineHeight: "60px",
+        padding: "8px",
+        fontSize: "14px",
+        fontWeight: "700",
+        fontFamily: "Inter",
+        width,
+      }}
+    >
+      <TitleWrapper
+        value={value}
+        rows={1}
+        onChange={handleChange}
+        onBlur={(event) => {
+          props.onNameChange(event.target.value);
+        }}
+        style={{ width: width }}
+        spellCheck="false"
+      >
+        {value}
+      </TitleWrapper>
+      <div
+        ref={mirrorDivRef}
+        style={{
+          position: "absolute",
+          top: "-9999px",
+          left: "-9999px",
+          whiteSpace: "pre-wrap",
+          textWrap: "nowrap",
+          visibility: "hidden",
+          fontFamily: "inherit",
+          fontSize: "inherit",
+          lineHeight: "inherit",
+          padding: "inherit",
+          border: "inherit",
+        }}
+      >
+        {value}
+      </div>
+    </div>
+  );
+}
+
+const TitleWrapper = styled("textarea")`
+  vertical-align: middle;
+  text-align: center;
+  height: 20px;
+  line-height: 20px;
+  border-radius: 4px;
+  padding: inherit;
+  overflow: hidden;
+  outline: none;
+  resize: none;
+  text-wrap: nowrap;
+  border: none;
+  &:hover {
+    background-color: #f2f2f2;
+  }
+  &:focus {
+    border: 1px solid grey;
+  }
+  font-weight: inherit;
+  font-family: inherit;
+  font-size: inherit;
+  max-width: 520px;
+  overflow: hidden;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+`;
--- a/webapp/src/AppComponents/rpc.ts
+++ b/webapp/src/AppComponents/rpc.ts
@@ -0,0 +1,70 @@
+export async function uploadFile(
+  arrayBuffer: ArrayBuffer,
+  fileName: string,
+): Promise<Blob> {
+  // Fetch request to upload the file
+  const response = await fetch(`/api/upload/${fileName}`, {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/octet-stream",
+      "Content-Disposition": `attachment; filename="${fileName}"`,
+    },
+    body: arrayBuffer,
+  });
+  const blob = await response.blob();
+  return blob;
+}
+
+export async function get_model(modelHash: string): Promise<Uint8Array> {
+  return new Uint8Array(
+    await (await fetch(`/api/model/${modelHash}`)).arrayBuffer(),
+  );
+}
+
+export async function downloadModel(bytes: Uint8Array, fileName: string) {
+  const response = await fetch("/api/download", {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/octet-stream",
+      "Content-Disposition": `attachment; filename="${fileName}"`,
+    },
+    body: bytes,
+  });
+  if (!response.ok) {
+    throw new Error("Network response was not ok");
+  }
+  const blob = await response.blob();
+
+  // Create a link element and trigger a download
+  const url = window.URL.createObjectURL(blob);
+  const a = document.createElement("a");
+  a.style.display = "none";
+  a.href = url;
+
+  // Use the same filename or change as needed
+  a.download = `${fileName}.xlsx`;
+  document.body.appendChild(a);
+  a.click();
+
+  // Clean up
+  window.URL.revokeObjectURL(url);
+  a.remove();
+}
+
+export async function shareModel(
+  bytes: Uint8Array,
+  fileName: string,
+): Promise<string> {
+  const response = await fetch("/api/share", {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/octet-stream",
+      "Content-Disposition": `attachment; filename="${fileName}"`,
+    },
+    body: bytes,
+  });
+  if (!response.ok) {
+    throw new Error("Network response was not ok");
+  }
+  return await response.text();
+}
--- a/webapp/src/AppComponents/storage.ts
+++ b/webapp/src/AppComponents/storage.ts
@@ -0,0 +1,129 @@
+import { Model } from "@ironcalc/wasm";
+import { base64ToBytes, bytesToBase64 } from "./util";
+
+const MAX_WORKBOOKS = 50;
+
+type ModelsMetadata = Record<string, string>;
+
+export function updateNameSelectedWorkbook(model: Model, newName: string) {
+  const uuid = localStorage.getItem("selected");
+  if (uuid) {
+    const modelsJson = localStorage.getItem("models");
+    if (modelsJson) {
+      try {
+        const models = JSON.parse(modelsJson);
+        models[uuid] = newName;
+        localStorage.setItem("models", JSON.stringify(models));
+      } catch (e) {
+        console.warn("Failed saving new name");
+      }
+    }
+    const modeBytes = model.toBytes();
+    localStorage.setItem(uuid, bytesToBase64(modeBytes));
+  }
+}
+
+export function getModelsMetadata(): ModelsMetadata {
+  let modelsJson = localStorage.getItem("models");
+  if (!modelsJson) {
+    modelsJson = "{}";
+  }
+  return JSON.parse(modelsJson);
+}
+
+// Pick a different name Workbook{N} where N = 1, 2, 3
+function getNewName(existingNames: string[]): string {
+  const baseName = "Workbook";
+  let index = 1;
+  while (index < MAX_WORKBOOKS) {
+    const name = `${baseName}${index}`;
+    index += 1;
+    if (!existingNames.includes(name)) {
+      return name;
+    }
+  }
+  // FIXME: Too many workbooks?
+  return "Workbook-Infinity";
+}
+
+export function createNewModel(): Model {
+  const models = getModelsMetadata();
+  const name = getNewName(Object.values(models));
+
+  const model = new Model(name, "en", "UTC");
+  const uuid = crypto.randomUUID();
+  localStorage.setItem("selected", uuid);
+  localStorage.setItem(uuid, bytesToBase64(model.toBytes()));
+
+  models[uuid] = name;
+  localStorage.setItem("models", JSON.stringify(models));
+  return model;
+}
+
+export function loadModelFromStorageOrCreate(): Model {
+  const uuid = localStorage.getItem("selected");
+  if (uuid) {
+    // We try to load the selected model
+    const modelBytesString = localStorage.getItem(uuid);
+    if (modelBytesString) {
+      return Model.from_bytes(base64ToBytes(modelBytesString));
+    }
+    // If it doesn't exist we create one at that uuid
+    const newModel = new Model("Workbook1", "en", "UTC");
+    localStorage.setItem("selected", uuid);
+    localStorage.setItem(uuid, bytesToBase64(newModel.toBytes()));
+    return newModel;
+  }
+  // If there was no selected model we create a new one
+  return createNewModel();
+}
+
+export function saveSelectedModelInStorage(model: Model) {
+  const uuid = localStorage.getItem("selected");
+  if (uuid) {
+    const modeBytes = model.toBytes();
+    localStorage.setItem(uuid, bytesToBase64(modeBytes));
+  }
+}
+
+export function saveModelToStorage(model: Model) {
+  const uuid = crypto.randomUUID();
+  localStorage.setItem("selected", uuid);
+  localStorage.setItem(uuid, bytesToBase64(model.toBytes()));
+  let modelsJson = localStorage.getItem("models");
+  if (!modelsJson) {
+    modelsJson = "{}";
+  }
+  const models = JSON.parse(modelsJson);
+  models[uuid] = model.getName();
+  localStorage.setItem("models", JSON.stringify(models));
+}
+
+export function selectModelFromStorage(uuid: string): Model | null {
+  localStorage.setItem("selected", uuid);
+  const modelBytesString = localStorage.getItem(uuid);
+  if (modelBytesString) {
+    return Model.from_bytes(base64ToBytes(modelBytesString));
+  }
+  return null;
+}
+
+export function getSelectedUuid(): string | null {
+  return localStorage.getItem("selected");
+}
+
+export function deleteSelectedModel(): Model | null {
+  const uuid = localStorage.getItem("selected");
+  if (!uuid) {
+    return null;
+  }
+  localStorage.removeItem(uuid);
+  const metadata = getModelsMetadata();
+  delete metadata[uuid];
+  localStorage.setItem("models", JSON.stringify(metadata));
+  const uuids = Object.keys(metadata);
+  if (uuids.length === 0) {
+    return createNewModel();
+  }
+  return selectModelFromStorage(uuids[0]);
+}
--- a/webapp/src/AppComponents/util.ts
+++ b/webapp/src/AppComponents/util.ts
@@ -0,0 +1,18 @@
+export function base64ToBytes(base64: string): Uint8Array {
+  //   const binString = atob(base64);
+  //   return Uint8Array.from(binString, (m) => m.codePointAt(0));
+
+  return new Uint8Array(
+    atob(base64)
+      .split("")
+      .map((c) => c.charCodeAt(0)),
+  );
+}
+
+export function bytesToBase64(bytes: Uint8Array): string {
+  const binString = Array.from(bytes, (byte) =>
+    String.fromCodePoint(byte),
+  ).join("");
+  // btoa(String.fromCharCode(...bytes));
+  return btoa(binString);
+}
--- a/webapp/src/components/WorksheetCanvas/constants.ts
+++ b/webapp/src/components/WorksheetCanvas/constants.ts
@@ -1,18 +1,21 @@
-export const headerCornerBackground = '#FFF';
-export const headerTextColor = '#333';
-export const headerBackground = '#FFF';
-export const headerGlobalSelectorColor = '#EAECF4';
-export const headerSelectedBackground = '#EEEEEE';
-export const headerFullSelectedBackground = '#D3D6E9';
-export const headerSelectedColor = '#333';
-export const headerBorderColor = '#DEE0EF';
+export const headerCornerBackground = "#FFF";
+export const headerTextColor = "#333";
+export const headerBackground = "#FFF";
+export const headerGlobalSelectorColor = "#EAECF4";
+export const headerSelectedBackground = "#EEEEEE";
+export const headerFullSelectedBackground = "#D3D6E9";
+export const headerSelectedColor = "#333";
+export const headerBorderColor = "#DEE0EF";

-export const gridColor = '#D3D6E9';
-export const gridSeparatorColor = '#D3D6E9';
-export const defaultTextColor = '#2E414D';
+export const gridColor = "#E0E0E0";
+export const gridSeparatorColor = "#D3D6E9";
+export const defaultTextColor = "#2E414D";

-export const outlineColor = '#F2994A';
-export const outlineBackgroundColor = '#F2994A1A';
+export const outlineColor = "#F2994A";
+export const outlineBackgroundColor = "#F2994A1A";

 export const LAST_COLUMN = 16_384;
 export const LAST_ROW = 1_048_576;
+
+export const ROW_HEIGH_SCALE = 1;
+export const COLUMN_WIDTH_SCALE = 1;
--- a/webapp/src/components/WorksheetCanvas/types.ts
+++ b/webapp/src/components/WorksheetCanvas/types.ts
@@ -1,23 +0,0 @@
-export interface Cell {
-  row: number;
-  column: number;
-}
-
-export interface Area {
-  rowStart: number;
-  rowEnd: number;
-  columnStart: number;
-  columnEnd: number;
-}
-
-export interface SheetArea extends Area {
-  sheet: number;
-  color: string;
-}
-
-interface AreaWithBorderInterface extends Area {
-  border: "left" | "top" | "right" | "bottom";
-}
-
-export type AreaWithBorder = AreaWithBorderInterface | null;
-
--- a/webapp/src/components/WorksheetCanvas/util.ts
+++ b/webapp/src/components/WorksheetCanvas/util.ts
@@ -1,396 +0,0 @@
-const letters = [
-    'A',
-    'B',
-    'C',
-    'D',
-    'E',
-    'F',
-    'G',
-    'H',
-    'I',
-    'J',
-    'K',
-    'L',
-    'M',
-    'N',
-    'O',
-    'P',
-    'Q',
-    'R',
-    'S',
-    'T',
-    'U',
-    'V',
-    'W',
-    'X',
-    'Y',
-    'Z',
-  ];
-  interface Reference {
-    row: number;
-    column: number;
-    absoluteRow: boolean;
-    absoluteColumn: boolean;
-  }
-  
-  export function referenceToString(rf: Reference): string {
-    const absC = rf.absoluteColumn ? '$' : '';
-    const absR = rf.absoluteRow ? '$' : '';
-    return absC + columnNameFromNumber(rf.column) + absR + rf.row;
-  }
-  
-  export function columnNameFromNumber(column: number): string {
-    let columnName = '';
-    let index = column;
-    while (index > 0) {
-      columnName = `${letters[(index - 1) % 26]}${columnName}`;
-      index = Math.floor((index - 1) / 26);
-    }
-    return columnName;
-  }
-  
-  export function columnNumberFromName(columnName: string): number {
-    let column = 0;
-    for (const character of columnName) {
-      const index = (character.codePointAt(0) ?? 0) - 64;
-      column = column * 26 + index;
-    }
-    return column;
-  }
-  
-  // EqualTo Color Palette
-  export function getColor(index: number, alpha = 1): string {
-    const colors = [
-      {
-        name: 'Cyan',
-        rgba: [89, 185, 188, 1],
-        hex: '#59B9BC',
-      },
-      {
-        name: 'Flamingo',
-        rgba: [236, 87, 83, 1],
-        hex: '#EC5753',
-      },
-      {
-        hex: '#3358B7',
-        rgba: [51, 88, 183, 1],
-        name: 'Blue',
-      },
-      {
-        hex: '#F8CD3C',
-        rgba: [248, 205, 60, 1],
-        name: 'Yellow',
-      },
-      {
-        hex: '#3BB68A',
-        rgba: [59, 182, 138, 1],
-        name: 'Emerald',
-      },
-      {
-        hex: '#523E93',
-        rgba: [82, 62, 147, 1],
-        name: 'Violet',
-      },
-      {
-        hex: '#A23C52',
-        rgba: [162, 60, 82, 1],
-        name: 'Burgundy',
-      },
-      {
-        hex: '#8CB354',
-        rgba: [162, 60, 82, 1],
-        name: 'Wasabi',
-      },
-      {
-        hex: '#D03627',
-        rgba: [208, 54, 39, 1],
-        name: 'Red',
-      },
-      {
-        hex: '#1B717E',
-        rgba: [27, 113, 126, 1],
-        name: 'Teal',
-      },
-    ];
-    if (alpha === 1) {
-      return colors[index % 10].hex;
-    }
-    const { rgba } = colors[index % 10];
-    return `rgba(${rgba[0]}, ${rgba[1]}, ${rgba[2]}, ${alpha})`;
-  }
-  
-  export function mergedAreas(area1: Area, area2: Area): Area {
-    return {
-      rowStart: Math.min(area1.rowStart, area2.rowStart, area1.rowEnd, area2.rowEnd),
-      rowEnd: Math.max(area1.rowStart, area2.rowStart, area1.rowEnd, area2.rowEnd),
-      columnStart: Math.min(area1.columnStart, area2.columnStart, area1.columnEnd, area2.columnEnd),
-      columnEnd: Math.max(area1.columnStart, area2.columnStart, area1.columnEnd, area2.columnEnd),
-    };
-  }
-  
-  export function getExpandToArea(area: Area, cell: Cell): AreaWithBorder {
-    let { rowStart, rowEnd, columnStart, columnEnd } = area;
-    if (rowStart > rowEnd) {
-      [rowStart, rowEnd] = [rowEnd, rowStart];
-    }
-    if (columnStart > columnEnd) {
-      [columnStart, columnEnd] = [columnEnd, columnStart];
-    }
-    const { row, column } = cell;
-    if (row <= rowEnd && row >= rowStart && column >= columnStart && column <= columnEnd) {
-      return null;
-    }
-    // Two rules:
-    //   * The extendTo area must be larger than the selected area
-    //   * The extendTo area must be of the same width or the same height as the selected area
-    if (row >= rowEnd && column >= columnStart) {
-      // Normal case: we are expanding down and right
-      if (row - rowEnd > column - columnEnd) {
-        // Expanding by rows (down)
-        return {
-          rowStart: rowEnd + 1,
-          rowEnd: row,
-          columnStart,
-          columnEnd,
-          border: 'top',
-        };
-      }
-      // expanding by columns (right)
-      return {
-        rowStart,
-        rowEnd,
-        columnStart: columnEnd + 1,
-        columnEnd: column,
-        border: 'left',
-      };
-    }
-    if (row >= rowEnd && column <= columnStart) {
-      // We are expanding down and left
-      if (row - rowEnd > columnStart - column) {
-        // Expanding by rows (down)
-        return {
-          rowStart: rowEnd + 1,
-          rowEnd: row,
-          columnStart,
-          columnEnd,
-          border: 'top',
-        };
-      }
-      // Expanding by columns (left)
-      return {
-        rowStart,
-        rowEnd,
-        columnStart: column,
-        columnEnd: columnStart - 1,
-        border: 'right',
-      };
-    }
-    if (row <= rowEnd && column >= columnEnd) {
-      // We are expanding up and right
-      if (rowStart - row > column - columnEnd) {
-        // Expanding by rows (up)
-        return {
-          rowStart: row,
-          rowEnd: rowStart - 1,
-          columnStart,
-          columnEnd,
-          border: 'bottom',
-        };
-      }
-      // Expanding by columns (right)
-      return {
-        rowStart,
-        rowEnd,
-        columnStart: columnEnd + 1,
-        columnEnd: column,
-        border: 'left',
-      };
-    }
-    if (row <= rowEnd && column <= columnStart) {
-      // We are expanding up and left
-      if (rowStart - row > columnStart - column) {
-        // Expanding by rows (up)
-        return {
-          rowStart: row,
-          rowEnd: rowStart - 1,
-          columnStart,
-          columnEnd,
-          border: 'bottom',
-        };
-      }
-      // Expanding by columns (left)
-      return {
-        rowStart,
-        rowEnd,
-        columnStart: column,
-        columnEnd: columnStart - 1,
-        border: 'right',
-      };
-    }
-    return null;
-  }
-  
-  /**
-   *  Returns true if the keypress should start editing
-   */
-  export function isEditingKey(key: string): boolean {
-    if (key.length !== 1) {
-      return false;
-    }
-    const code = key.codePointAt(0) ?? 0;
-    if (code > 0 && code < 255) {
-      return true;
-    }
-    return false;
-  }
-  
-  // /  Common types
-  
-  export interface Area {
-    rowStart: number;
-    rowEnd: number;
-    columnStart: number;
-    columnEnd: number;
-  }
-  
-  interface AreaWithBorderInterface extends Area {
-    border: 'left' | 'top' | 'right' | 'bottom';
-  }
-  
-  export type AreaWithBorder = AreaWithBorderInterface | null;
-  
-  export interface Cell {
-    row: number;
-    column: number;
-  }
-  
-  export interface ScrollPosition {
-    left: number;
-    top: number;
-  }
-  
-  export interface StateSettings {
-    selectedCell: Cell;
-    selectedArea: Area;
-    scrollPosition: ScrollPosition;
-    extendToArea: AreaWithBorder;
-  }
-  
-  export type Dispatch<A> = (value: A) => void;
-  export type SetStateAction<S> = S | ((prevState: S) => S);
-  
-  export enum FocusType {
-    Cell = 'cell',
-    FormulaBar = 'formula-bar',
-  }
-  
-  /**
-   *  In Excel there are two "modes" of editing
-   *   * `init`: When you start typing in a cell. In this mode arrow keys will move away from the cell
-   *   * `edit`: If you double click on a cell or click in the cell while editing.
-   *     In this mode arrow keys will move within the cell.
-   *
-   * In a formula bar mode is always `edit`.
-   */
-  export type CellEditMode = 'init' | 'edit';
-  export interface CellEditingType {
-    /**
-     * ID of cell editing. Useful when one edit transforms into another and some code needs to run
-     * when target changes.
-     *
-     * Due to problems with focus management (see #339) it's possible to start a new cell editing
-     * without properly cleaning up previous one (lose focus in workbook, regain focus NOT in
-     * the input and then use the keyboard.
-     */
-    id: number;
-    sheet: number;
-    row: number;
-    column: number;
-    text: string;
-    base: string;
-    mode: CellEditMode;
-    focus: FocusType;
-  }
-  
-  export type NavigationKey = 'ArrowRight' | 'ArrowLeft' | 'ArrowDown' | 'ArrowUp' | 'Home' | 'End';
-  
-  export const isNavigationKey = (key: string): key is NavigationKey =>
-    ['ArrowRight', 'ArrowLeft', 'ArrowDown', 'ArrowUp', 'Home', 'End'].includes(key);
-  
-  function nameNeedsQuoting(name: string): boolean {
-    const chars = [' ', '(', ')', "'", '$', ',', ';', '-', '+', '{', '}'];
-    const l = chars.length;
-    for (let index = 0; index < l; index += 1) {
-      if (name.includes(chars[index])) {
-        return true;
-      }
-    }
-    return false;
-  }
-  
-  // FIXME: We should use the function of a similar name in the rust code.
-  export const quoteSheetName = (name: string): string => {
-    if (nameNeedsQuoting(name)) {
-      return `'${name.replace("'", "''")}'`;
-    }
-    return name;
-  };
-  
-  export function cellReprToRowColumn(cellRepr: string): { row: number; column: number } {
-    let row = 0;
-    let column = 0;
-    for (const character of cellRepr) {
-      if (Number.isNaN(Number.parseInt(character, 10))) {
-        column *= 26;
-        const characterCode = character.codePointAt(0);
-        const ACharacterCode = 'A'.codePointAt(0);
-        if (typeof characterCode === 'undefined' || typeof ACharacterCode === 'undefined') {
-          throw new TypeError('Failed to find character code');
-        }
-        const deltaCodes = characterCode - ACharacterCode;
-        if (deltaCodes < 0) {
-          throw new Error('Incorrect character');
-        }
-        column += deltaCodes + 1;
-      } else {
-        row *= 10;
-        row += Number.parseInt(character, 10);
-      }
-    }
-    return { row, column };
-  }
-  
-  export const getMessageCellText = (
-    cell: string,
-    getMessageSheetNumber: (sheet: string) => number | undefined,
-    getCellText?: (sheet: number, row: number, column: number) => string | undefined,
-  ) => {
-    const messageMatch = /^=?(?<sheet>\w+)!(?<cell>\w+)/.exec(cell);
-    if (messageMatch && messageMatch.groups) {
-      const messageSheet = getMessageSheetNumber(messageMatch.groups.sheet);
-      const dynamicIconCell = cellReprToRowColumn(messageMatch.groups.cell);
-      if (messageSheet !== undefined && getCellText) {
-        return getCellText(messageSheet, dynamicIconCell.row, dynamicIconCell.column) || '';
-      }
-    }
-    return '';
-  };
-  
-  export const getCellAddress = (selectedArea: Area, selectedCell?: Cell) => {
-    const isSingleCell =
-      selectedArea.rowStart === selectedArea.rowEnd &&
-      selectedArea.columnEnd === selectedArea.columnStart;
-  
-    return isSingleCell && selectedCell
-      ? `${columnNameFromNumber(selectedCell.column)}${selectedCell.row}`
-      : `${columnNameFromNumber(selectedArea.columnStart)}${
-          selectedArea.rowStart
-        }:${columnNameFromNumber(selectedArea.columnEnd)}${selectedArea.rowEnd}`;
-  };
-  
-  export enum Border {
-    Top = 'top',
-    Bottom = 'bottom',
-    Right = 'right',
-    Left = 'left',
-  }
--- a/webapp/src/components/WorksheetCanvas/worksheetCanvas.ts
+++ b/webapp/src/components/WorksheetCanvas/worksheetCanvas.ts
@@ -1,6 +1,13 @@
-import { Model } from "@ironcalc/wasm";
-import { WorkbookState } from "../workbookState";
+import type { Model } from "@ironcalc/wasm";
+import { columnNameFromNumber } from "@ironcalc/wasm";
+import { getColor } from "../editor/util";
+import type { Cell } from "../types";
+import type { WorkbookState } from "../workbookState";
 import {
+  COLUMN_WIDTH_SCALE,
+  LAST_COLUMN,
+  LAST_ROW,
+  ROW_HEIGH_SCALE,
  defaultTextColor,
  gridColor,
  gridSeparatorColor,
@@ -9,11 +16,8 @@ import {
  headerSelectedBackground,
  headerSelectedColor,
  headerTextColor,
-  LAST_COLUMN,
-  LAST_ROW,
  outlineColor,
 } from "./constants";
-import { columnNameFromNumber } from "./util";

 export interface CanvasSettings {
  model: Model;
@@ -29,29 +33,42 @@ export interface CanvasSettings {
    columnGuide: HTMLDivElement;
    rowGuide: HTMLDivElement;
    columnHeaders: HTMLDivElement;
+    editor: HTMLDivElement;
  };
  onColumnWidthChanges: (sheet: number, column: number, width: number) => void;
  onRowHeightChanges: (sheet: number, row: number, height: number) => void;
 }

-export interface CellCoordinates {
-  row: number;
-  column: number;
-}
-
 export const fonts = {
  regular: 'Inter, "Adjusted Arial Fallback", sans-serif',
  mono: '"Fira Mono", "Adjusted Courier New Fallback", serif',
 };

-export const headerRowHeight = 24;
+export const headerRowHeight = 28;
 export const headerColumnWidth = 30;
-export const devicePixelRatio = 1;//window.devicePixelRatio || 1;
+export const devicePixelRatio = window.devicePixelRatio || 1;

 export const defaultCellFontFamily = fonts.regular;
 export const headerFontFamily = fonts.regular;
 export const frozenSeparatorWidth = 3;

+// Get a 10% transparency of an hex color
+function hexToRGBA10Percent(colorHex: string): string {
+  // Remove the leading hash (#) if present
+  const hex = colorHex.replace(/^#/, "");
+
+  // Parse the hex color
+  const red = Number.parseInt(hex.substring(0, 2), 16);
+  const green = Number.parseInt(hex.substring(2, 4), 16);
+  const blue = Number.parseInt(hex.substring(4, 6), 16);
+
+  // Set the alpha (opacity) to 0.1 (10%)
+  const alpha = 0.1;
+
+  // Return the RGBA color string
+  return `rgba(${red}, ${green}, ${blue}, ${alpha})`;
+}
+
 export default class WorksheetCanvas {
  sheetWidth: number;

@@ -65,6 +82,8 @@ export default class WorksheetCanvas {

  canvas: HTMLCanvasElement;

+  editor: HTMLDivElement;
+
  areaOutline: HTMLDivElement;

  cellOutline: HTMLDivElement;
@@ -96,6 +115,7 @@ export default class WorksheetCanvas {
    this.height = options.height;
    this.ctx = this.setContext();
    this.workbookState = options.workbookState;
+    this.editor = options.elements.editor;

    this.cellOutline = options.elements.cellOutline;
    this.cellOutlineHandle = options.elements.cellOutlineHandle;
@@ -105,7 +125,6 @@ export default class WorksheetCanvas {
    this.columnGuide = options.elements.columnGuide;
    this.columnHeaders = options.elements.columnHeaders;

-    // this.cellEditing = options.cellEditing;
    this.onColumnWidthChanges = options.onColumnWidthChanges;
    this.onRowHeightChanges = options.onRowHeightChanges;
    this.resetHeaders();
@@ -124,12 +143,12 @@ export default class WorksheetCanvas {

  resetHeaders(): void {
    for (const handle of this.columnHeaders.querySelectorAll(
-      ".column-resize-handle"
+      ".column-resize-handle",
    )) {
      handle.remove();
    }
    for (const columnSeparator of this.columnHeaders.querySelectorAll(
-      ".frozen-column-separator"
+      ".frozen-column-separator",
    )) {
      columnSeparator.remove();
    }
@@ -143,7 +162,7 @@ export default class WorksheetCanvas {
    const context = canvas.getContext("2d");
    if (!context) {
      throw new Error(
-        "This browser does not support 2-dimensional canvas rendering contexts."
+        "This browser does not support 2-dimensional canvas rendering contexts.",
      );
    }
    // If the devicePixelRatio is 2 then the canvas is twice as large to avoid blurring.
@@ -167,7 +186,7 @@ export default class WorksheetCanvas {
   */
  getFrozenRowsHeight(): number {
    const frozenRows = this.model.getFrozenRowsCount(
-      this.model.getSelectedSheet()
+      this.model.getSelectedSheet(),
    );
    if (frozenRows === 0) {
      return 0;
@@ -185,7 +204,7 @@ export default class WorksheetCanvas {
   */
  getFrozenColumnsWidth(): number {
    const frozenColumns = this.model.getFrozenColumnsCount(
-      this.model.getSelectedSheet()
+      this.model.getSelectedSheet(),
    );
    if (frozenColumns === 0) {
      return 0;
@@ -194,7 +213,7 @@ export default class WorksheetCanvas {
    for (let column = 1; column <= frozenColumns; column += 1) {
      frozenColumnsWidth += this.getColumnWidth(
        this.model.getSelectedSheet(),
-        column
+        column,
      );
    }
    return frozenColumnsWidth + frozenSeparatorWidth;
@@ -202,16 +221,16 @@ export default class WorksheetCanvas {

  // Get the visible cells (aside from the frozen rows and columns)
  getVisibleCells(): {
-    topLeftCell: CellCoordinates;
-    bottomRightCell: CellCoordinates;
+    topLeftCell: Cell;
+    bottomRightCell: Cell;
  } {
    const view = this.model.getSelectedView();
-    let selectedSheet = view.sheet;
+    const selectedSheet = view.sheet;
    const frozenRows = this.model.getFrozenRowsCount(selectedSheet);
    const frozenColumns = this.model.getFrozenColumnsCount(selectedSheet);
-    let rowTop = Math.max(frozenRows + 1, view.top_row);
+    const rowTop = Math.max(frozenRows + 1, view.top_row);
    let rowBottom = rowTop;
-    let columnLeft = Math.max(frozenColumns + 1, view.left_column);
+    const columnLeft = Math.max(frozenColumns + 1, view.left_column);
    let columnRight = columnLeft;
    const frozenColumnsWidth = this.getFrozenColumnsWidth();
    const frozenRowsHeight = this.getFrozenRowsHeight();
@@ -221,9 +240,8 @@ export default class WorksheetCanvas {
      if (y >= this.height - rowHeight || row === LAST_ROW) {
        rowBottom = row;
        break;
-      } else {
-        y += rowHeight;
      }
+      y += rowHeight;
    }

    let x = headerColumnWidth + frozenColumnsWidth;
@@ -232,17 +250,14 @@ export default class WorksheetCanvas {
      if (x >= this.width - columnWidth || column === LAST_COLUMN) {
        columnRight = column;
        break;
-      } else {
-        x += columnWidth;
      }
+      x += columnWidth;
    }

-    let cells = {
+    const cells = {
      topLeftCell: { row: rowTop, column: columnLeft },
      bottomRightCell: { row: rowBottom, column: columnRight },
-    }
-
-    this.workbookState.setVisibleCells(cells)
+    };

    return cells;
  }
@@ -321,7 +336,7 @@ export default class WorksheetCanvas {
    x: number,
    y: number,
    width: number,
-    height: number
+    height: number,
  ): void {
    const selectedSheet = this.model.getSelectedSheet();
    const style = this.model.getCellStyle(selectedSheet, row, column);
@@ -345,11 +360,11 @@ export default class WorksheetCanvas {
      }
    }
    let horizontalAlign = "general";
-    if (style.alignment && style.alignment.horizontal) {
+    if (style.alignment?.horizontal) {
      horizontalAlign = style.alignment.horizontal;
    }
    let verticalAlign = "bottom";
-    if (style.alignment && style.alignment.vertical) {
+    if (style.alignment?.vertical) {
      verticalAlign = style.alignment.vertical;
    }

@@ -383,7 +398,7 @@ export default class WorksheetCanvas {
          borderLeftWidth = 3;
      }
    } else {
-      let leftStyle = this.model.getCellStyle(selectedSheet, row, column - 1);
+      const leftStyle = this.model.getCellStyle(selectedSheet, row, column - 1);
      if (leftStyle.border.right) {
        borderLeftColor = leftStyle.border.right.color;
        switch (leftStyle.border.right.style) {
@@ -422,7 +437,7 @@ export default class WorksheetCanvas {
          borderTopWidth = 3;
      }
    } else {
-      let topStyle = this.model.getCellStyle(selectedSheet, row - 1, column);
+      const topStyle = this.model.getCellStyle(selectedSheet, row - 1, column);
      if (topStyle.border.bottom) {
        borderTopColor = topStyle.border.bottom.color;
        switch (topStyle.border.bottom.style) {
@@ -458,7 +473,7 @@ export default class WorksheetCanvas {
    const fullText = this.model.getFormattedCellValue(
      selectedSheet,
      row,
-      column
+      column,
    );
    const padding = 4;
    if (horizontalAlign === "general") {
@@ -478,15 +493,17 @@ export default class WorksheetCanvas {
    context.clip();

    // Is there any better parameter?
-    const lineHeight = fontSize;
+    const lineHeight = 22;
+    const lines = fullText.split("\n");
+    const lineCount = lines.length;

-    fullText.split("\n").forEach((text, line) => {
+    lines.forEach((text, line) => {
      const textWidth = context.measureText(text).width;
-      let textX;
-      let textY;
+      let textX: number;
+      let textY: number;
      // The idea is that in the present font-size and default row heigh,
      // top/bottom and center horizontalAlign coincide
-      let verticalPadding = 4;
+      const verticalPadding = 4;
      if (horizontalAlign === "right") {
        textX = width - padding + x - textWidth / 2;
      } else if (horizontalAlign === "center") {
@@ -496,14 +513,18 @@ export default class WorksheetCanvas {
        textX = padding + x + textWidth / 2;
      }
      if (verticalAlign === "bottom") {
-        textY = y + height - fontSize / 2 - verticalPadding;
+        textY =
+          y +
+          height -
+          fontSize / 2 -
+          verticalPadding +
+          (line - lineCount + 1) * lineHeight;
      } else if (verticalAlign === "center") {
-        textY = y + height / 2;
+        textY = y + height / 2 + (line + (1 - lineCount) / 2) * lineHeight;
      } else {
        // aligned top
-        textY = y + fontSize / 2 + verticalPadding;
+        textY = y + fontSize / 2 + verticalPadding + line * lineHeight;
      }
-      textY += line * lineHeight;
      context.fillText(text, textX, textY);
      if (style.font) {
        if (style.font.u) {
@@ -536,7 +557,7 @@ export default class WorksheetCanvas {
  private addColumnResizeHandle(
    x: number,
    column: number,
-    columnWidth: number
+    columnWidth: number,
  ): void {
    const div = document.createElement("div");
    div.className = "column-resize-handle";
@@ -562,7 +583,7 @@ export default class WorksheetCanvas {
      this.onColumnWidthChanges(
        this.model.getSelectedSheet(),
        column,
-        newColumnWidth
+        newColumnWidth,
      );
    };
    resizeHandleUp = resizeHandleUp.bind(this);
@@ -614,7 +635,7 @@ export default class WorksheetCanvas {
  private styleColumnHeader(
    width: number,
    div: HTMLDivElement,
-    selected: boolean
+    selected: boolean,
  ): void {
    div.style.boxSizing = "border-box";
    div.style.width = `${width}px`;
@@ -644,10 +665,10 @@ export default class WorksheetCanvas {

  private renderRowHeaders(
    frozenRows: number,
-    topLeftCell: CellCoordinates,
-    bottomRightCell: CellCoordinates
+    topLeftCell: Cell,
+    bottomRightCell: Cell,
  ): void {
-    let { sheet: selectedSheet, range } = this.model.getSelectedView();
+    const { sheet: selectedSheet, range } = this.model.getSelectedView();
    let rowStart = range[0];
    let rowEnd = range[2];
    if (rowStart > rowEnd) {
@@ -662,15 +683,15 @@ export default class WorksheetCanvas {
      const rowHeight = this.getRowHeight(selectedSheet, row);
      const selected = row >= rowStart && row <= rowEnd;
      context.fillStyle = headerBorderColor;
-      context.fillRect(0, topLeftCornerY, headerColumnWidth, rowHeight);
+      context.fillRect(0.5, topLeftCornerY, headerColumnWidth, rowHeight);
      context.fillStyle = selected
        ? headerSelectedBackground
        : headerBackground;
      context.fillRect(
-        1,
-        topLeftCornerY + 1,
-        headerColumnWidth - 2,
-        rowHeight - 2
+        0.5,
+        topLeftCornerY + 0.5,
+        headerColumnWidth,
+        rowHeight - 1,
      );
      if (selected) {
        context.fillStyle = outlineColor;
@@ -682,7 +703,7 @@ export default class WorksheetCanvas {
        `${row}`,
        headerColumnWidth / 2,
        topLeftCornerY + rowHeight / 2,
-        headerColumnWidth
+        headerColumnWidth,
      );
      topLeftCornerY += rowHeight;
      this.addRowResizeHandle(topLeftCornerY, row, rowHeight);
@@ -696,11 +717,11 @@ export default class WorksheetCanvas {
  private renderColumnHeaders(
    frozenColumns: number,
    firstColumn: number,
-    lastColumn: number
+    lastColumn: number,
  ): void {
    const { columnHeaders } = this;
    let deltaX = 0;
-    let { range } = this.model.getSelectedView();
+    const { range } = this.model.getSelectedView();
    let columnStart = range[1];
    let columnEnd = range[3];
    if (columnStart > columnEnd) {
@@ -709,11 +730,11 @@ export default class WorksheetCanvas {
    for (const header of columnHeaders.querySelectorAll(".column-header"))
      header.remove();
    for (const handle of columnHeaders.querySelectorAll(
-      ".column-resize-handle"
+      ".column-resize-handle",
    ))
      handle.remove();
    for (const separator of columnHeaders.querySelectorAll(
-      ".frozen-column-separator"
+      ".frozen-column-separator",
    ))
      separator.remove();
    columnHeaders.style.fontFamily = headerFontFamily;
@@ -750,11 +771,11 @@ export default class WorksheetCanvas {
  private addColumnHeader(
    deltaX: number,
    column: number,
-    selected: boolean
+    selected: boolean,
  ): number {
    const columnWidth = this.getColumnWidth(
      this.model.getSelectedSheet(),
-      column
+      column,
    );
    const div = document.createElement("div");
    div.className = "column-header";
@@ -776,10 +797,10 @@ export default class WorksheetCanvas {
      y += this.getRowHeight(this.model.getSelectedSheet(), row);
    }
    this.sheetWidth = Math.floor(
-      x + this.getColumnWidth(this.model.getSelectedSheet(), LAST_COLUMN)
+      x + this.getColumnWidth(this.model.getSelectedSheet(), LAST_COLUMN),
    );
    this.sheetHeight = Math.floor(
-      y + 2 * this.getRowHeight(this.model.getSelectedSheet(), LAST_ROW)
+      y + 2 * this.getRowHeight(this.model.getSelectedSheet(), LAST_ROW),
    );
    return [this.sheetWidth, this.sheetHeight];
  }
@@ -798,7 +819,7 @@ export default class WorksheetCanvas {
    width: number,
    height: number,
    includeFrozenRows: boolean,
-    includeFrozenColumns: boolean
+    includeFrozenColumns: boolean,
  ): string {
    if (!includeFrozenRows && !includeFrozenColumns) {
      return "";
@@ -829,30 +850,30 @@ export default class WorksheetCanvas {
    startRow: number,
    startColumn: number,
    endRow: number,
-    endColumn: number
+    endColumn: number,
  ): [number, number] {
    const [xStart, yStart] = this.getCoordinatesByCell(startRow, startColumn);
    let [xEnd, yEnd] = this.getCoordinatesByCell(endRow, endColumn);
    xEnd += this.getColumnWidth(this.model.getSelectedSheet(), endColumn);
    yEnd += this.getRowHeight(this.model.getSelectedSheet(), endRow);
    const frozenRows = this.model.getFrozenRowsCount(
-      this.model.getSelectedSheet()
+      this.model.getSelectedSheet(),
    );
    const frozenColumns = this.model.getFrozenColumnsCount(
-      this.model.getSelectedSheet()
+      this.model.getSelectedSheet(),
    );
    if (frozenRows !== 0 || frozenColumns !== 0) {
      let [xFrozenEnd, yFrozenEnd] = this.getCoordinatesByCell(
        frozenRows,
-        frozenColumns
+        frozenColumns,
      );
      xFrozenEnd += this.getColumnWidth(
        this.model.getSelectedSheet(),
-        frozenColumns
+        frozenColumns,
      );
      yFrozenEnd += this.getRowHeight(
        this.model.getSelectedSheet(),
-        frozenRows
+        frozenRows,
      );
      if (startRow <= frozenRows && endRow > frozenRows) {
        yEnd = Math.max(yEnd, yFrozenEnd);
@@ -876,7 +897,8 @@ export default class WorksheetCanvas {
    const frozenRows = this.model.getFrozenRowsCount(selectedSheet);
    const frozenRowsHeight = this.getFrozenRowsHeight();
    const { topLeftCell } = this.getVisibleCells();
-    let x, y;
+    let x: number;
+    let y: number;
    if (row <= frozenRows) {
      // row is one of the frozen rows
      y = headerRowHeight;
@@ -926,14 +948,14 @@ export default class WorksheetCanvas {
   */
  getCellByCoordinates(
    x: number,
-    y: number
+    y: number,
  ): { row: number; column: number } | null {
    const frozenColumns = this.model.getFrozenColumnsCount(
-      this.model.getSelectedSheet()
+      this.model.getSelectedSheet(),
    );
    const frozenColumnsWidth = this.getFrozenColumnsWidth();
    const frozenRows = this.model.getFrozenRowsCount(
-      this.model.getSelectedSheet()
+      this.model.getSelectedSheet(),
    );
    const frozenRowsHeight = this.getFrozenRowsHeight();
    let column = 0;
@@ -982,7 +1004,6 @@ export default class WorksheetCanvas {
        }
        cellY -= this.getRowHeight(this.model.getSelectedSheet(), row);
      }
-
    } else if (y < headerRowHeight + frozenRowsHeight) {
      while (cellY <= y) {
        row += 1;
@@ -1032,80 +1053,87 @@ export default class WorksheetCanvas {
      rowStart,
      columnStart,
      rowEnd,
-      columnEnd
+      columnEnd,
    );
-    // const { border } = extendToArea;
    extendToOutline.style.border = `1px dashed ${outlineColor}`;
    extendToOutline.style.borderRadius = "3px";
-    // switch (border) {
-    //   case 'left': {
-    //     extendToOutline.style.borderLeft = 'none';
-    //     extendToOutline.style.borderTopLeftRadius = '0px';
-    //     extendToOutline.style.borderBottomLeftRadius = '0px';

-    //     break;
-    //   }
-    //   case 'right': {
-    //     extendToOutline.style.borderRight = 'none';
-    //     extendToOutline.style.borderTopRightRadius = '0px';
-    //     extendToOutline.style.borderBottomRightRadius = '0px';
-
-    //     break;
-    //   }
-    //   case 'top': {
-    //     extendToOutline.style.borderTop = 'none';
-    //     extendToOutline.style.borderTopRightRadius = '0px';
-    //     extendToOutline.style.borderTopLeftRadius = '0px';
-
-    //     break;
-    //   }
-    //   case 'bottom': {
-    //     extendToOutline.style.borderBottom = 'none';
-    //     extendToOutline.style.borderBottomRightRadius = '0px';
-    //     extendToOutline.style.borderBottomLeftRadius = '0px';
-
-    //     break;
-    //   }
-    //   default:
-    //     break;
-    // }
-    const padding = 1;
-    extendToOutline.style.left = `${areaX - padding}px`;
-    extendToOutline.style.top = `${areaY - padding}px`;
-    extendToOutline.style.width = `${areaWidth + 2 * padding}px`;
-    extendToOutline.style.height = `${areaHeight + 2 * padding}px`;
+    extendToOutline.style.left = `${areaX}px`;
+    extendToOutline.style.top = `${areaY}px`;
+    extendToOutline.style.width = `${areaWidth - 1}px`;
+    extendToOutline.style.height = `${areaHeight - 1}px`;
  }

  private getColumnWidth(sheet: number, column: number): number {
-    return Math.round(this.model.getColumnWidth(sheet, column));
+    return Math.round(
+      this.model.getColumnWidth(sheet, column) * COLUMN_WIDTH_SCALE,
+    );
  }

  private getRowHeight(sheet: number, row: number): number {
-    return Math.round(this.model.getRowHeight(sheet, row));
+    return Math.round(this.model.getRowHeight(sheet, row) * ROW_HEIGH_SCALE);
+  }
+
+  private drawCellEditor(): void {
+    const cell = this.workbookState.getEditingCell();
+    const selectedSheet = this.model.getSelectedSheet();
+    const { editor } = this;
+    if (!cell || cell.sheet !== selectedSheet) {
+      // If the editing cell is not in the same sheet as the selected sheet
+      // we take the editor out of view
+      editor.style.left = "-9999px";
+      editor.style.top = "-9999px";
+      return;
+    }
+    const { row, column } = cell;
+    // const style = this.model.getCellStyle(
+    //   selectedSheet,
+    //   selectedRow,
+    //   selectedColumn
+    // );
+    // cellOutline.style.fontWeight = style.font.b ? "bold" : "normal";
+    // cellOutline.style.fontStyle = style.font.i ? "italic" : "normal";
+    // cellOutline.style.backgroundColor = style.fill.fg_color;
+    // TODO: Should we add the same color as the text?
+    // Only if it is not a formula?
+    // cellOutline.style.color = style.font.color;
+    const [x, y] = this.getCoordinatesByCell(row, column);
+    const padding = -1;
+    const width = cell.editorWidth + 2 * padding;
+    const height = cell.editorHeight + 2 * padding;
+    // const width =
+    //   this.getColumnWidth(sheet, column) + 2 * padding;
+    // const height = this.getRowHeight(sheet, row) + 2 * padding;
+    editor.style.left = `${x}px`;
+    editor.style.top = `${y}px`;
+    editor.style.width = `${width - 1}px`;
+    editor.style.height = `${height - 1}px`;
  }

  private drawCellOutline(): void {
+    const { cellOutline, areaOutline, cellOutlineHandle } = this;
+    if (this.workbookState.getEditingCell()) {
+      cellOutline.style.visibility = "hidden";
+      cellOutlineHandle.style.visibility = "hidden";
+      areaOutline.style.visibility = "hidden";
+      return;
+    }
+    cellOutline.style.visibility = "visible";
+    cellOutlineHandle.style.visibility = "visible";
+    areaOutline.style.visibility = "visible";
+
    const [selectedSheet, selectedRow, selectedColumn] =
      this.model.getSelectedCell();
    const { topLeftCell } = this.getVisibleCells();
    const frozenRows = this.model.getFrozenRowsCount(selectedSheet);
    const frozenColumns = this.model.getFrozenColumnsCount(selectedSheet);
    const [x, y] = this.getCoordinatesByCell(selectedRow, selectedColumn);
-    const style = this.model.getCellStyle(
-      selectedSheet,
-      selectedRow,
-      selectedColumn
-    );
+
    const padding = -1;
    const width =
      this.getColumnWidth(selectedSheet, selectedColumn) + 2 * padding;
    const height = this.getRowHeight(selectedSheet, selectedRow) + 2 * padding;

-    const { cellOutline, areaOutline, cellOutlineHandle } = this;
-    const cellEditing = null;
-
-    cellOutline.style.visibility = "visible";
-    cellOutlineHandle.style.visibility = "visible";
    if (
      (selectedRow < topLeftCell.row && selectedRow > frozenRows) ||
      (selectedColumn < topLeftCell.column && selectedColumn > frozenColumns)
@@ -1115,8 +1143,8 @@ export default class WorksheetCanvas {
    }

    // Position the cell outline and clip it
-    cellOutline.style.left = `${x - padding}px`;
-    cellOutline.style.top = `${y - padding}px`;
+    cellOutline.style.left = `${x - padding - 2}px`;
+    cellOutline.style.top = `${y - padding - 2}px`;
    // Reset CSS properties
    cellOutline.style.minWidth = "";
    cellOutline.style.minHeight = "";
@@ -1124,18 +1152,11 @@ export default class WorksheetCanvas {
    cellOutline.style.maxHeight = "";
    cellOutline.style.overflow = "hidden";
    // New properties
-    cellOutline.style.width = `${width}px`;
-    cellOutline.style.height = `${height}px`;
-    if (cellEditing) {
-      cellOutline.style.fontWeight = style.font.b ? "bold" : "normal";
-      cellOutline.style.fontStyle = style.font.i ? "italic" : "normal";
-      // cellOutline.style.backgroundColor = style.fill.fg_color;
-      // TODO: Should we add the same color as the text?
-      // Only if it is not a formula?
-      // cellOutline.style.color = style.font.color;
-    } else {
-      cellOutline.style.background = "none";
-    }
+    cellOutline.style.width = `${width + 1}px`;
+    cellOutline.style.height = `${height + 1}px`;
+
+    cellOutline.style.background = "none";
+
    // border is 2px so line-height must be height - 4
    cellOutline.style.lineHeight = `${height - 4}px`;
    let {
@@ -1147,8 +1168,8 @@ export default class WorksheetCanvas {
    if (columnStart > columnEnd) {
      [columnStart, columnEnd] = [columnEnd, columnStart];
    }
-    let handleX;
-    let handleY;
+    let handleX: number;
+    let handleY: number;
    // Position the selected area outline
    if (columnStart === columnEnd && rowStart === rowEnd) {
      areaOutline.style.visibility = "hidden";
@@ -1163,14 +1184,14 @@ export default class WorksheetCanvas {
        rowStart,
        columnStart,
        rowEnd,
-        columnEnd
+        columnEnd,
      );
      handleX = areaX + areaWidth;
      handleY = areaY + areaHeight;
-      areaOutline.style.left = `${areaX - padding}px`;
-      areaOutline.style.top = `${areaY - padding}px`;
-      areaOutline.style.width = `${areaWidth + 2 * padding}px`;
-      areaOutline.style.height = `${areaHeight + 2 * padding}px`;
+      areaOutline.style.left = `${areaX - padding - 1}px`;
+      areaOutline.style.top = `${areaY - padding - 1}px`;
+      areaOutline.style.width = `${areaWidth + 2 * padding + 1}px`;
+      areaOutline.style.height = `${areaHeight + 2 * padding + 1}px`;
      const clipLeft = rowStart < topLeftCell.row && rowStart > frozenRows;
      const clipTop =
        columnStart < topLeftCell.column && columnStart > frozenColumns;
@@ -1180,7 +1201,7 @@ export default class WorksheetCanvas {
        areaWidth + 2 * padding,
        areaHeight + 2 * padding,
        clipLeft,
-        clipTop
+        clipTop,
      );
      areaOutline.style.border = `1px solid ${outlineColor}`;
      // hide the handle if it is out of the visible area
@@ -1211,26 +1232,102 @@ export default class WorksheetCanvas {
      }
    }

-    // draw the handle
-    if (cellEditing !== null) {
-      cellOutlineHandle.style.visibility = "hidden";
-      return;
-    }
    const handleBBox = cellOutlineHandle.getBoundingClientRect();
    const handleWidth = handleBBox.width;
    const handleHeight = handleBBox.height;
-    cellOutlineHandle.style.left = `${handleX - handleWidth / 2}px`;
-    cellOutlineHandle.style.top = `${handleY - handleHeight / 2}px`;
+    cellOutlineHandle.style.left = `${handleX - handleWidth / 2 - 1}px`;
+    cellOutlineHandle.style.top = `${handleY - handleHeight / 2 - 1}px`;
+  }
+
+  private drawCutRange(): void {
+    const range = this.workbookState.getCutRange() || null;
+    if (!range) {
+      return;
+    }
+    const selectedSheet = this.model.getSelectedSheet();
+    if (range.sheet !== selectedSheet) {
+      return;
+    }
+    const ctx = this.ctx;
+    ctx.setLineDash([2, 2]);
+
+    const [xStart, yStart] = this.getCoordinatesByCell(
+      range.rowStart,
+      range.columnStart,
+    );
+    const [xEnd, yEnd] = this.getCoordinatesByCell(
+      range.rowEnd + 1,
+      range.columnEnd + 1,
+    );
+    ctx.strokeStyle = "red";
+    ctx.lineWidth = 1;
+    ctx.strokeRect(xStart, yStart, xEnd - xStart, yEnd - yStart);
+
+    ctx.setLineDash([]);
+  }
+
+  private drawActiveRanges(topLeftCell: Cell, bottomRightCell: Cell): void {
+    let activeRanges = this.workbookState.getActiveRanges();
+    const ctx = this.ctx;
+    ctx.setLineDash([2, 2]);
+    const referencedRange =
+      this.workbookState.getEditingCell()?.referencedRange || null;
+    if (referencedRange) {
+      activeRanges = activeRanges.concat([
+        {
+          ...referencedRange.range,
+          color: getColor(activeRanges.length),
+        },
+      ]);
+    }
+    const selectedSheet = this.model.getSelectedSheet();
+    const activeRangesCount = activeRanges.length;
+    for (let rangeIndex = 0; rangeIndex < activeRangesCount; rangeIndex += 1) {
+      const range = activeRanges[rangeIndex];
+      if (range.sheet !== selectedSheet) {
+        continue;
+      }
+
+      const allowedOffset = 1; // to make borders look nicer
+      const minRow = topLeftCell.row - allowedOffset;
+      const maxRow = bottomRightCell.row + allowedOffset;
+      const minColumn = topLeftCell.column - allowedOffset;
+      const maxColumn = bottomRightCell.column + allowedOffset;
+
+      if (
+        minRow <= range.rowEnd &&
+        range.rowStart <= maxRow &&
+        minColumn <= range.columnEnd &&
+        range.columnStart < maxColumn
+      ) {
+        // Range in the viewport.
+        const displayRange: typeof range = {
+          ...range,
+          rowStart: Math.max(minRow, range.rowStart),
+          rowEnd: Math.min(maxRow, range.rowEnd),
+          columnStart: Math.max(minColumn, range.columnStart),
+          columnEnd: Math.min(maxColumn, range.columnEnd),
+        };
+        const [xStart, yStart] = this.getCoordinatesByCell(
+          displayRange.rowStart,
+          displayRange.columnStart,
+        );
+        const [xEnd, yEnd] = this.getCoordinatesByCell(
+          displayRange.rowEnd + 1,
+          displayRange.columnEnd + 1,
+        );
+        ctx.strokeStyle = range.color;
+        ctx.lineWidth = 1;
+        ctx.strokeRect(xStart, yStart, xEnd - xStart, yEnd - yStart);
+        ctx.fillStyle = hexToRGBA10Percent(range.color);
+        ctx.fillRect(xStart, yStart, xEnd - xStart, yEnd - yStart);
+      }
+    }
+
+    ctx.setLineDash([]);
  }

  renderSheet(): void {
-    console.time('renderSheet');
-    this._renderSheet();
-    console.timeEnd('renderSheet');
-
-  }
-
-  private _renderSheet(): void {
    const context = this.ctx;
    const { canvas } = this;
    const selectedSheet = this.model.getSelectedSheet();
@@ -1350,17 +1447,23 @@ export default class WorksheetCanvas {
    this.renderColumnHeaders(
      frozenColumns,
      topLeftCell.column,
-      bottomRightCell.column
+      bottomRightCell.column,
    );

    // Draw row headers
    this.renderRowHeaders(frozenRows, topLeftCell, bottomRightCell);

    // square in the top left corner
-    context.fillStyle = headerBorderColor;
-    context.fillRect(0, 0, headerColumnWidth, headerRowHeight);
+    context.beginPath();
+    context.strokeStyle = gridSeparatorColor;
+    context.moveTo(0, 0.5);
+    context.lineTo(x + headerColumnWidth, 0.5);
+    context.stroke();

    this.drawCellOutline();
+    this.drawCellEditor();
    this.drawExtendToArea();
+    this.drawActiveRanges(topLeftCell, bottomRightCell);
+    this.drawCutRange();
  }
 }
--- a/webapp/src/components/borderPicker.tsx
+++ b/webapp/src/components/borderPicker.tsx
@@ -1,4 +1,13 @@
-import React, { useRef, useState } from "react";
+import { type BorderOptions, BorderStyle, BorderType } from "@ironcalc/wasm";
+import Popover, { type PopoverOrigin } from "@mui/material/Popover";
+import { styled } from "@mui/material/styles";
+import {
+  Grid2X2 as BorderAllIcon,
+  ChevronRight,
+  PencilLine,
+} from "lucide-react";
+import type React from "react";
+import { useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import {
  BorderBottomIcon,
@@ -6,28 +15,19 @@ import {
  BorderCenterVIcon,
  BorderInnerIcon,
  BorderLeftIcon,
+  BorderNoneIcon,
  BorderOuterIcon,
  BorderRightIcon,
-  BorderTopIcon,
-  BorderNoneIcon,
  BorderStyleIcon,
+  BorderTopIcon,
 } from "../icons";
-import ColorPicker from "./colorPicker";
-import Popover, { PopoverOrigin } from "@mui/material/Popover";
-import {
-  Check,
-  ChevronDown,
-  Grid2X2 as BorderAllIcon,
-  PencilLine,
-  ChevronRight,
-} from "lucide-react";
-import { styled } from "@mui/material/styles";
 import { theme } from "../theme";
-import { BorderOptions, BorderStyle, BorderType } from "@ironcalc/wasm";
+import ColorPicker from "./colorPicker";

 type BorderPickerProps = {
  className?: string;
  onChange: (border: BorderOptions) => void;
+  onClose: () => void;
  anchorEl: React.RefObject<HTMLElement>;
  anchorOrigin?: PopoverOrigin;
  transformOrigin?: PopoverOrigin;
@@ -37,25 +37,33 @@ type BorderPickerProps = {
 const BorderPicker = (properties: BorderPickerProps) => {
  const { t } = useTranslation();

-  const [borderSelected, setBorderSelected] = useState(BorderType.None);
+  const [borderSelected, setBorderSelected] = useState<BorderType | null>(null);
  const [borderColor, setBorderColor] = useState("#000000");
  const [borderStyle, setBorderStyle] = useState(BorderStyle.Thin);
  const [colorPickerOpen, setColorPickerOpen] = useState(false);
  const [stylePickerOpen, setStylePickerOpen] = useState(false);
-  const closePicker = (): void => {
+
+  // biome-ignore lint/correctness/useExhaustiveDependencies: <explanation>
+  useEffect(() => {
+    if (!borderSelected) {
+      return;
+    }
    properties.onChange({
      color: borderColor,
      style: borderStyle,
      border: borderSelected,
    });
-  };
+  }, [borderColor, borderStyle, borderSelected]);
+
+  const onClose = properties.onClose;
+
  const borderColorButton = useRef(null);
  const borderStyleButton = useRef(null);
  return (
    <>
      <StyledPopover
        open={properties.open}
-        onClose={(): void => closePicker()}
+        onClose={onClose}
        anchorEl={properties.anchorEl.current}
        anchorOrigin={
          properties.anchorOrigin || { vertical: "bottom", horizontal: "left" }
@@ -72,13 +80,13 @@ const BorderPicker = (properties: BorderPickerProps) => {
                $pressed={borderSelected === BorderType.All}
                onClick={() => {
                  if (borderSelected === BorderType.All) {
-                    setBorderSelected(BorderType.None);
+                    setBorderSelected(null);
                  } else {
                    setBorderSelected(BorderType.All);
                  }
                }}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.all")}
              >
                <BorderAllIcon />
              </Button>
@@ -87,13 +95,13 @@ const BorderPicker = (properties: BorderPickerProps) => {
                $pressed={borderSelected === BorderType.Inner}
                onClick={() => {
                  if (borderSelected === BorderType.Inner) {
-                    setBorderSelected(BorderType.None);
+                    setBorderSelected(null);
                  } else {
                    setBorderSelected(BorderType.Inner);
                  }
                }}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.inner")}
              >
                <BorderInnerIcon />
              </Button>
@@ -102,13 +110,13 @@ const BorderPicker = (properties: BorderPickerProps) => {
                $pressed={borderSelected === BorderType.CenterH}
                onClick={() => {
                  if (borderSelected === BorderType.CenterH) {
-                    setBorderSelected(BorderType.None);
+                    setBorderSelected(null);
                  } else {
                    setBorderSelected(BorderType.CenterH);
                  }
                }}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.horizontal")}
              >
                <BorderCenterHIcon />
              </Button>
@@ -117,13 +125,13 @@ const BorderPicker = (properties: BorderPickerProps) => {
                $pressed={borderSelected === BorderType.CenterV}
                onClick={() => {
                  if (borderSelected === BorderType.CenterV) {
-                    setBorderSelected(BorderType.None);
+                    setBorderSelected(null);
                  } else {
                    setBorderSelected(BorderType.CenterV);
                  }
                }}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.vertical")}
              >
                <BorderCenterVIcon />
              </Button>
@@ -138,7 +146,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                  }
                }}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.outer")}
              >
                <BorderOuterIcon />
              </Button>
@@ -155,7 +163,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                  }
                }}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.clear")}
              >
                <BorderNoneIcon />
              </Button>
@@ -170,7 +178,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                  }
                }}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.top")}
              >
                <BorderTopIcon />
              </Button>
@@ -185,7 +193,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                  }
                }}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.right")}
              >
                <BorderRightIcon />
              </Button>
@@ -200,7 +208,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                  }
                }}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.bottom")}
              >
                <BorderBottomIcon />
              </Button>
@@ -215,7 +223,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                  }
                }}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.left")}
              >
                <BorderLeftIcon />
              </Button>
@@ -229,23 +237,26 @@ const BorderPicker = (properties: BorderPickerProps) => {
                $pressed={false}
                disabled={false}
                ref={borderColorButton}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.color")}
              >
                <PencilLine />
              </Button>
-              <div style={{flexGrow:2}}>Border color</div>
+              <div style={{ flexGrow: 2 }}>Border color</div>
              <ChevronRightStyled />
            </ButtonWrapper>
-            <ButtonWrapper onClick={() => setStylePickerOpen(true)} ref={borderStyleButton}>
+            <ButtonWrapper
+              onClick={() => setStylePickerOpen(true)}
+              ref={borderStyleButton}
+            >
              <Button
                type="button"
                $pressed={false}
                disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.style")}
              >
                <BorderStyleIcon />
              </Button>
-              <div style={{flexGrow:2}}>Border style</div>
+              <div style={{ flexGrow: 2 }}>Border style</div>
              <ChevronRightStyled />
            </ButtonWrapper>
          </Styles>
@@ -256,6 +267,9 @@ const BorderPicker = (properties: BorderPickerProps) => {
            setBorderColor(color);
            setColorPickerOpen(false);
          }}
+          onClose={() => {
+            setColorPickerOpen(false);
+          }}
          anchorEl={borderColorButton}
          open={colorPickerOpen}
        />
@@ -269,7 +283,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
          transformOrigin={{ vertical: 38, horizontal: -6 }}
        >
          <BorderStyleDialog>
-          <LineWrapper
+            <LineWrapper
              onClick={() => {
                setBorderStyle(BorderStyle.Dashed);
                setStylePickerOpen(false);
@@ -353,39 +367,22 @@ const LineWrapper = styled("div")<LineWrapperProperties>`
  align-items: center;
  background-color: ${({ $checked }): string => {
    if ($checked) {
-      return '#EEEEEE;';
-    } else {
-      return 'inherit;';
+      return "#EEEEEE;";
    }
+    return "inherit;";
  }};
  &:hover {
-    border: 1px solid #EEEEEE;
+    border: 1px solid #eeeeee;
  }
-  padding:8px;
+  padding: 8px;
  cursor: pointer;
  border-radius: 4px;
  border: 1px solid white;
 `;

-const CheckIconWrapper = styled("div")`
-  width: 12px;
-`;
-
-type CheckIconProperties = { $checked: boolean };
-const CheckIcon = styled("div")<CheckIconProperties>`
-  width: 2px;
-  background-color: #EEE;
-  height: 28px;
-  visibility: ${({ $checked }): string => {
-    if ($checked) {
-      return "visible";
-    }
-    return "hidden";
-  }};
-`;
 const NoneLine = styled("div")`
  width: 68px;
-  border-top: 1px solid #E0E0E0;
+  border-top: 1px solid #e0e0e0;
 `;
 const SolidLine = styled("div")`
  width: 68px;
@@ -407,7 +404,7 @@ const DottedLine = styled("div")`
  width: 68px;
  border-top: 1px dotted #333333;
 `;
-const DoubleLine = styled('div')`
+const DoubleLine = styled("div")`
  width: 68px;
  border-top: 3px double #333333;
 `;
@@ -415,7 +412,7 @@ const DoubleLine = styled('div')`
 const Divider = styled("div")`
  display: inline-flex;
  heigh: 1px;
-  border-bottom: 1px solid #EEE;
+  border-bottom: 1px solid #eee;
  margin-left: 0px;
  margin-right: 0px;
 `;
@@ -442,11 +439,11 @@ const ButtonWrapper = styled("div")`
  flex-direction: row;
  align-items: center;
  &:hover {
-    background-color: #EEE;
+    background-color: #eee;
    border-top-color: ${(): string => theme.palette.grey["400"]};
  }
  cursor: pointer;
-  padding: 8px
+  padding: 8px;
 `;

 const BorderStyleDialog = styled("div")`
@@ -470,7 +467,7 @@ const StyledPopover = styled(Popover)`
    padding: 0px;
  }
  font-family: ${({ theme }) => theme.typography.fontFamily};
-  font-size: 13px;
+  font-size: 12px;
 `;

 const BorderPickerDialog = styled("div")`
@@ -481,45 +478,13 @@ const BorderPickerDialog = styled("div")`
 `;

 const BorderDescription = styled("div")`
-width: 70px;
+  width: 70px;
 `;

-// type TypeButtonProperties = { $pressed: boolean; $underlinedColor?: string };
-// const Button = styled.button<TypeButtonProperties>`
-//   width: 23px;
-//   height: 23px;
-//   display: inline-flex;
-//   align-items: center;
-//   justify-content: center;
-//   font-size: 14px;
-//   border-radius: 2px;
-//   margin-right: 5px;
-//   transition: all 0.2s;
-
-//   ${({ theme, disabled, $pressed, $underlinedColor }): string => {
-//     if (disabled) {
-//       return `
-//       color: ${theme.palette.grey['600']};
-//       cursor: default;
-//     `;
-//     }
-//     return `
-//       border-top: ${$underlinedColor ? '3px solid #FFF' : 'none'};
-//       border-bottom: ${$underlinedColor ? `3px solid ${$underlinedColor}` : 'none'};
-//       color: ${theme.palette.text.primary};
-//       background-color: ${$pressed ? theme.palette.grey['600'] : '#FFF'};
-//       &:hover {
-//         background-color: ${theme.palette.grey['400']};
-//         border-top-color: ${theme.palette.grey['400']};
-//       }
-//     `;
-//   }}
-// `;
-
 type TypeButtonProperties = { $pressed: boolean; $underlinedColor?: string };
 const Button = styled("button")<TypeButtonProperties>(
  ({ disabled, $pressed, $underlinedColor }) => {
-    let result: Record<string, any> = {
+    const result = {
      width: "24px",
      height: "24px",
      display: "inline-flex",
@@ -527,35 +492,35 @@ const Button = styled("button")<TypeButtonProperties>(
      justifyContent: "center",
      // fontSize: "26px",
      border: "0px solid #fff",
-      borderRadius: "2px",
+      borderRadius: "4px",
      marginRight: "5px",
      transition: "all 0.2s",
      cursor: "pointer",
      padding: "0px",
    };
    if (disabled) {
-      result.color = theme.palette.grey["600"];
-      result.cursor = "default";
-    } else {
-      result.borderTop = $underlinedColor ? "3px solid #FFF" : "none";
-      result.borderBottom = $underlinedColor
-        ? `3px solid ${$underlinedColor}`
-        : "none";
-      (result.color = "#21243A"),
-        (result.backgroundColor = $pressed
-          ? theme.palette.grey["600"]
-          : "inherit");
-      result["&:hover"] = {
-        backgroundColor: "#F1F2F8",
-        borderTopColor: "#F1F2F8",
-      };
-      result["svg"] = {
-        width: "16px",
-        height: "16px",
+      return {
+        ...result,
+        color: theme.palette.grey["600"],
+        cursor: "default",
      };
    }
-    return result;
-  }
+    return {
+      ...result,
+      borderTop: $underlinedColor ? "3px solid #FFF" : "none",
+      borderBottom: $underlinedColor ? `3px solid ${$underlinedColor}` : "none",
+      color: "#21243A",
+      backgroundColor: $pressed ? theme.palette.grey["200"] : "inherit",
+      "&:hover": {
+        backgroundColor: "#F1F2F8",
+        borderTopColor: "#F1F2F8",
+      },
+      svg: {
+        width: "16px",
+        height: "16px",
+      },
+    };
+  },
 );

 const ChevronRightStyled = styled(ChevronRight)`
--- a/webapp/src/components/clipboard.ts
+++ b/webapp/src/components/clipboard.ts
@@ -0,0 +1,2 @@
+export const getNewClipboardId = () => new Date().toISOString();
+export const CLIPBOARD_ID_SESSION_STORAGE_KEY = "IronCalc-Clipboard";
--- a/webapp/src/components/colorPicker.tsx
+++ b/webapp/src/components/colorPicker.tsx
@@ -1,6 +1,7 @@
 import styled from "@emotion/styled";
-import Popover, { PopoverOrigin } from "@mui/material/Popover";
-import React, { useEffect, useRef, useState } from "react";
+import Popover, { type PopoverOrigin } from "@mui/material/Popover";
+import type React from "react";
+import { useEffect, useRef, useState } from "react";
 import { HexColorInput, HexColorPicker } from "react-colorful";
 import { theme } from "../theme";

@@ -8,6 +9,7 @@ type ColorPickerProps = {
  className?: string;
  color: string;
  onChange: (color: string) => void;
+  onClose: () => void;
  anchorEl: React.RefObject<HTMLElement>;
  anchorOrigin?: PopoverOrigin;
  transformOrigin?: PopoverOrigin;
@@ -28,6 +30,10 @@ const ColorPicker = (properties: ColorPickerProps) => {
    recentColors.current = [newColor, ...colors].slice(0, maxRecentColors);
  };

+  const handleClose = (): void => {
+    properties.onClose();
+  };
+
  useEffect(() => {
    setColor(properties.color);
  }, [properties.color]);
@@ -49,7 +55,7 @@ const ColorPicker = (properties: ColorPickerProps) => {
  return (
    <Popover
      open={properties.open}
-      onClose={(): void => closePicker(color)}
+      onClose={handleClose}
      anchorEl={properties.anchorEl.current}
      anchorOrigin={
        properties.anchorOrigin || { vertical: "bottom", horizontal: "left" }
@@ -78,9 +84,12 @@ const ColorPicker = (properties: ColorPickerProps) => {
              />
            </HexColorInputBox>
          </HexWrapper>
-          <Swatch $color={color} onClick={(): void => {
-                closePicker(color);
-              }} />
+          <Swatch
+            $color={color}
+            onClick={(): void => {
+              closePicker(color);
+            }}
+          />
        </ColorPickerInput>
        <HorizontalDivider />
        <ColorList>
--- a/webapp/src/components/constants.tsx
+++ b/webapp/src/components/constants.tsx
@@ -0,0 +1,3 @@
+export const TOOLBAR_HEIGH = 48;
+export const FORMULA_BAR_HEIGH = 40;
+export const NAVIGATION_HEIGH = 40;
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Nicolás Hatcher	24dd63b261	FIX: Correct tag number (oops)	2024-11-15 01:07:02 +01:00
Nicolás Hatcher	861700cb45	UPDATE: Adds CHANGELOG	2024-11-15 00:59:13 +01:00
Mehdi Armachi	98dc557a01	Adds navigation labels for sheet management	2024-11-11 10:36:54 +01:00
Nicolás Hatcher	2c2228c2c2	FIX: [App]: Borders done right	2024-10-31 22:43:43 +01:00
Nicolás Hatcher	494a315cbd	FIX: Do geometry right	2024-10-31 22:43:43 +01:00
Nicolás Hatcher	0c69889832	FIX: Column/Row width/height UI issues	2024-10-31 22:43:43 +01:00
Nicolás Hatcher	04d8c658ab	UPDATE: Adds cut/paste	2024-10-31 22:43:43 +01:00
Nicolás Hatcher	dad4755b16	FIX: Fixes from Dani's design	2024-10-26 11:04:52 +02:00
Nicolás Hatcher	75d8a5282e	FIX: Slightly better behaviour for increase/decrease decimal places The general solution must be done in Rust and it is a bit more complex.	2024-10-26 11:04:52 +02:00
Nicolás Hatcher	f78027247b	FIX: Make biome happy	2024-10-26 11:04:52 +02:00
Nicolás Hatcher	ee6a41c4f4	FIX: Nicer loading image	2024-10-26 11:04:52 +02:00
Nicolás Hatcher	b7336f70d6	FIX[App]: Font-size of menu is 12px	2024-10-26 11:04:52 +02:00
Nicolás Hatcher	dae37f14ba	FIX[App]: Over scroll issues	2024-10-26 11:04:52 +02:00
Nicolás Hatcher	7ffbfac432	FIX[WebApp]: fixes in formula bar * fx is not clickable * Removed chevron * Show slecting/ed area in address	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	f9ea4fd757	FIX[WebApp]: Only show the active ranges in the correct sheet Fixes #104	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	7446932519	FIX[WebApp]: Keep the area extended as selected Fixes #110	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	d55845e69f	FIX[WebApp]: PreventDefault when clicking on the Format Editor Fixes #112	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	9e5b959ccc	FIX[WebApp]: Pass the name along to the serve Fixes #111	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	ffa93309e2	FIX: Renaming a sheet with the same name doesn't do anything Fixes #103	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	79216b286b	FIX: Caret color is IronCalc	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	411d4a3780	FIX: Make biome happy	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	3a7aa15347	FIX: Mark code as ununsed for now	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	090e852054	FIX: Make selected sheet bold	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	3e54ad5b3c	FIX: Rename sheet dialog with correct default name Fixes #103	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	7b12c2682e	FIX: Headers height show be the same as the default row height	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	80273a88ec	FIX: When creating a new sheet, select it Fixes #100	2024-10-24 21:54:34 +02:00
Nicolás Hatcher	3d951c5c50	FIX: Several UI fixes from Dani * Toast has Inter font-family * Share button has Inter font family * More accurate menu list to design * Removes unused navigation * Adds link to IronCalc * Removes line=black :O	2024-10-23 22:42:22 +02:00
Nicolás Hatcher	cd54389e91	UPDATE: Implement copy/paste in the UI	2024-10-23 21:43:18 +02:00
Nicolás Hatcher	843d8beb02	FIX: Once again more apparently I don't have anything better to do :D	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	09ac29785d	FIX[wasm]: Fixes failing test	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	2b530423c8	FIX[base]: Adds test for names and row heigh	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	51c41900d7	FIX: Fix broken tests	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	730a815729	FIX[Editor]: More simplifications and fixes	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	9805d0c518	FIX: Set the color of the refe range to be the next from the active ranges	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	10a9d36f3d	FIX: Make biome happy	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	480640dc98	UPDATE[WebApp]: we can now delete models on the localStorage	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	3058a63e4f	FIX: Correct default for vertical align	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	8275d73b64	FIX: Set default row height to 22 This matches the line height. So far a magic number	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	072abb2240	FIX: Vertical Align by default is bottom	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	9a46e5ccc7	FIX: More fixes to the cell editor * Font family is Inter, font size 13, line-width 22 * Correct vertical align for multiline text * Entering multiline text sets the height of the row (!)	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	585e594d8d	FIX: Diverse fixes to the editor * Editor now expands as you write * You can switch between the formula bar and cell editor * While editing in the formula bar you see the results in the editor * Give Mateusz more credit	2024-10-15 19:29:21 +02:00
Nicolás Hatcher	248ef66e7c	FIX: Make biome happy	2024-10-11 21:08:16 +02:00
Nicolás Hatcher	15da2e5785	FIX: Close the sheet list menu when a sheet is selected	2024-10-11 21:08:16 +02:00
Nicolás Hatcher	39174add1f	FIX: number format menu closes when selected	2024-10-11 21:08:16 +02:00
Nicolás Hatcher	e412f5fc22	FIX: Delete the selected area correctly Previously it was deleting one extra row and column	2024-10-11 21:08:16 +02:00
Nicolás Hatcher	42c1a39131	FIX: Cell editor correct behaviour	2024-10-11 21:08:16 +02:00
Nicolás Hatcher	f26cdd3a4b	FIX: Sets the patternFill to solid when changing the background color	2024-10-11 21:08:16 +02:00
Nicolás Hatcher	4016eb5944	FIX: Better support for mobile phones	2024-10-11 21:08:16 +02:00
Nicolás Hatcher	58dfdd329e	FIX: Fix broken build	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	4a290aec7c	FIX: Forgotten file :S	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	3966dbc790	FIX: Correct font-size in navigation bar	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	abd4ce4ea5	FIX: Let’s move the outline handle to left and top 1px	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	02da1eb388	FIX: Make default cells 25% larger	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	1131234531	FIX: Slightly better widths in the row headers I'm afraid this nees to be completely redone	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	b495397b5f	FIX: Proper imports	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	8c0a566995	FIX: Set grid color to grey-300	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	dd62dd2dc6	FIX: Set format menu font-size to 12px	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	79b7b9b817	FIX: Correct paddings in formula bar	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	06ae1a1d6d	FIX: Fix tooltips on buttons * Strike through, * Hide grid lines * all vertical/horizontal align buttons	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	6390739fd4	FIX: Correct height of toolbar (48) and formula bar (40)	2024-10-08 23:10:34 +02:00
Nicolás Hatcher	e41741cf77	FIX: Change border color between toolbox and formula bar to grey-300	2024-10-08 23:10:34 +02:00
Nicolás Hatcher Andrés	48719b6416	UPDATE: Adds cell and formula editing (#92 ) * UPDATE: Adds cell and formula editing * FIX: Do not loose focus when clicking on the formula we are editing * FIX: Minimal implementation of browse mode * FIX: Initial browse mode within sheets * UPDATE: Webapp Minimal Web Application	2024-10-08 19:44:27 +02:00
Nicolás Hatcher Andrés	53d3d5144c	UPDATE: point documentation to app instead of playground (#93 )	2024-09-28 19:23:32 +02:00
Nicolás Hatcher Andrés	bf9a1ed9f4	FIX: Add infrastructure for python tests (#91 ) Also integrated with CI and runs tests in documentation	2024-09-21 15:46:32 +02:00
Nicolás Hatcher Andrés	11df4a55c7	UPDATE: Adds python bindings (#90 ) * UPDATE: Adds python bindings Exclude pyroncalc and wasm from test coverage	2024-09-21 11:58:50 +02:00
Nicolás Hatcher Andrés	00b5b65588	UPDATE: bump version to 0.2.0 (#89 )	2024-09-17 00:27:06 +02:00
Varun Hegde	2b03b3e3b9	Error Handling of public Set functions (#88 ) What are we trying to achieve ? ++ Currently all the major public set functions is panic prone and does not handle and return error. This PR tries to address to all those functions. What major errors that could happen in these functions ? ++ All the functions which are being made as error safe is being tested against invalid sheet, row and column values, which could given by user What are the list of functions whose return type has been altered ? base/src/model.rs 1. update_cell_with_text 2. update_cell_with_bool 3. update_cell_with_number 4. set_user_input 5. get_cell_style_index 6. get_style_for_cell 7. set_cell_with_string ++> New functions being added 1. set_cell_with_boolean 2. set_cell_with_number base/src/styles.rs 1. get_style_with_quote_prefix 3. get_style_with_format 4. get_style_without_quote_prefix 5. get_style base/src/worksheet.rs 1. update_cell 2. set_cell_style 3. set_cell_with_formula 4. set_cell_with_number 6. set_cell_with_string 8. set_cell_with_boolean 9. set_cell_with_error 10. cell_clear_contents 11. cell_clear_contents_with_style ++> Above is the comprehensive list of all functions being ( most are public, some are private ) altered for better error handling. As a side effect of changing function signature, there are many changes being done to other functions ( mostly adding "?" to enable to error propagation further )	2024-09-14 17:37:31 +02:00
Nicolás Hatcher Andrés	83a4431417	FIX[WebApp]: Simplify loading logic of workbook (#87 ) Note that previously the model would have been fetched twice	2024-08-24 06:59:19 +02:00
Nicolás Hatcher Andrés	40aa8bebaf	UPDATE: Adds `load_from_xlsx_bytes` (#86 ) This is usefull if we are transfering bytes, for instance over the internet	2024-08-24 06:50:31 +02:00
Nicolás Hatcher Andrés	b9bf485379	Update README.md (#80 ) We don't need a logo anymore	2024-08-18 12:50:34 +02:00
Nicolás Hatcher Andrés	dc23a7f29c	UPDATE: Adds web app (#79 ) Things missing: * Browse mode * Front end tests * Storybook	2024-08-18 11:44:16 +02:00
Varun Hegde	083548608e	Exporting the Merged Cell : Exports the merged cell properly with testcase to verify the scenario (#76 ) * adding the functionality of exporting the merged cell with testcase to vreify the above enhancement * addressing review comments : 1) moving the testing to appropriate folder 2) fixing lint errors 3) fixing the scenario when merge cell count is 0 * addressing 2nd round review comments : cosmetic fixes * addressing review comments : taking reference instead of cloning	2024-07-21 16:13:58 +02:00