FIX: Correct tag number (oops)

The general solution must be done in Rust and it is a bit more complex.

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

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"
@@ -375,10 +424,12 @@ dependencies = [
  "bitcode",
  "chrono",
  "chrono-tz",
+ "csv",
+ "csv-sniffer",
  "js-sys",
  "once_cell",
  "rand",
- "regex",
+ "regex 1.10.4",
  "ryu",
  "serde",
  "serde_json",
@@ -417,6 +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"
@@ -480,7 +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]]
@@ -689,16 +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]]
@@ -707,9 +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]]
@@ -849,6 +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"
@@ -874,6 +962,12 @@ 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"
@@ -886,6 +980,12 @@ 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"

README.md

@@ -123,7 +123,7 @@ 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

base/Cargo.toml

@@ -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"

base/src/constants.rs

@@ -2,8 +2,8 @@
 /// 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_COLUMN_WIDTH: f64 = 125.0;
-pub(crate) const DEFAULT_ROW_HEIGHT: f64 = 21.0;
+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;

base/src/lib.rs

@@ -58,4 +58,5 @@ pub mod mock_time;
 pub use model::get_milliseconds_since_epoch;
 pub use model::Model;
 pub use user_model::BorderArea;
+pub use user_model::ClipboardData;
 pub use user_model::UserModel;

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

base/src/test/user_model/mod.rs

@@ -11,6 +11,7 @@ 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;

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();
@@ -87,10 +87,18 @@ fn delete_sheet_propagates() {
 fn delete_last_sheet() {
     // Deleting the last sheet, selects the previous
     let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
-    model.new_sheet();
+    model.new_sheet().unwrap();
-    model.new_sheet();
+    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);
+}

base/src/test/user_model/test_border.rs

@@ -51,6 +51,84 @@ fn borders_all() {
         }
     }
 
+    // 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##"{
@@ -63,8 +141,8 @@ fn borders_all() {
     )
     .unwrap();
     model.set_area_with_border(range, &border_area).unwrap();
-    for row in 5..9 {
+    for row in 4..10 {
-        for column in 6..9 {
+        for column in 5..10 {
             let style = model.get_cell_style(0, row, column).unwrap();
             let expected_border = Border {
                 diagonal_up: false,
@@ -229,6 +307,84 @@ fn borders_outer() {
         };
         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]
@@ -275,6 +431,72 @@ fn borders_top() {
             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]

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();
 

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");
+}

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));

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);
+}

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();

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));
+}

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();
 

base/src/test/user_model/test_view.rs

@@ -65,13 +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();
+    model.new_sheet().unwrap();
-    assert_eq!(model.get_selected_sheet(), 0);
+    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]

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,

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:
@@ -335,13 +364,27 @@ impl UserModel {
 
         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
@@ -412,6 +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,
@@ -748,7 +796,6 @@ impl UserModel {
         range: &Area,
         border_area: &BorderArea,
     ) -> Result<(), String> {
-        // FIXME: We need to set the border also in neighbouring cells.
         let sheet = range.sheet;
         let mut diff_list = Vec::new();
         let last_row = range.row + range.height - 1;
@@ -758,12 +805,6 @@ impl UserModel {
                 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());
@@ -820,7 +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;
                     }
                 }
 
@@ -834,6 +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(())
@@ -872,9 +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);
@@ -950,7 +1112,7 @@ 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> {
+    pub fn get_cell_style(&self, sheet: u32, row: i32, column: i32) -> Result<Style, String> {
         self.model.get_style_for_cell(sheet, row, column)
     }
 
@@ -1183,6 +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) {

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;

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)

bindings/wasm/src/lib.rs

@@ -6,7 +6,7 @@ use wasm_bindgen::{
 use ironcalc_base::{
     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 {
@@ -37,8 +37,8 @@ pub struct Model {
 #[wasm_bindgen]
 impl Model {
     #[wasm_bindgen(constructor)]
-    pub fn new(locale: &str, timezone: &str) -> Result<Model, JsError> {
+    pub fn new(name: &str, locale: &str, timezone: &str) -> Result<Model, JsError> {
-        let model = BaseModel::new_empty("workbook", locale, timezone).map_err(to_js_error)?;
+        let model = BaseModel::new_empty(name, locale, timezone).map_err(to_js_error)?;
         Ok(Model { model })
     }
 
@@ -97,8 +97,8 @@ impl Model {
     }
 
     #[wasm_bindgen(js_name = "newSheet")]
-    pub fn new_sheet(&mut self) {
+    pub fn new_sheet(&mut self) -> Result<(), JsError> {
-        self.model.new_sheet()
+        self.model.new_sheet().map_err(to_js_error)
     }
 
     #[wasm_bindgen(js_name = "deleteSheet")]
@@ -482,4 +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()))
+    }
 }

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');
+    let model = new Model('Workbook1', 'en', 'UTC');
-    assert.strictEqual(model.getRowHeight(0, 3), 21);
+    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);
 

bindings/wasm/types.ts

@@ -205,3 +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];
+}

webapp/index.html

@@ -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>

webapp/src/App.css

@@ -1,6 +1,10 @@
 #root {
   position: absolute;
-  inset: 10px;
+  inset: 0px;
-  border: 1px solid #aaa;
+  margin: 0px;
-  border-radius: 4px;
+  border: none;
+}
+html,
+body {
+  overscroll-behavior: none;
 }

webapp/src/App.tsx

@@ -4,32 +4,47 @@ import "./i18n";
 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,
   );
+
   useEffect(() => {
     async function start() {
       await init();
       const queryString = window.location.search;
       const urlParams = new URLSearchParams(queryString);
-      const modelName = urlParams.get("model");
+      const modelHash = urlParams.get("model");
-      // If there is a model name ?model=example.ic we try to load it
+      // 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 (modelName) {
+      if (modelHash) {
+        // Get a remote model
         try {
-          const model_bytes = new Uint8Array(
+          const model_bytes = await get_model(modelHash);
-            await (await fetch(`./${modelName}`)).arrayBuffer(),
+          const importedModel = Model.from_bytes(model_bytes);
-          );
+          localStorage.removeItem("selected");
-          setModel(Model.from_bytes(model_bytes));
+          setModel(importedModel);
         } catch (e) {
-          setModel(new Model("en", "UTC"));
+          alert("Model not found, or failed to load");
         }
       } else {
-        setModel(new Model("en", "UTC"));
+        // try to load from local storage
+        const newModel = loadModelFromStorageOrCreate();
+        setModel(newModel);
       }
       setWorkbookState(new WorkbookState());
     }
@@ -37,20 +52,77 @@ function App() {
   }, []);
 
   if (!model || !workbookState) {
-    return <Loading>Loading</Loading>;
+    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} />;
+
+  return (
+    <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>
+  );
 }
 
+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-size: 36px;
+  font-family: 'Inter';
+  font-size: 14px;
 `;
 
 export default App;

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;
+`;

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;
+  }
+`;

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;
+  }
+`;

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;
+`;

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;
+`;

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();
+}

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]);
+}

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);
+}

webapp/src/components/WorksheetCanvas/constants.ts

@@ -7,7 +7,7 @@ export const headerFullSelectedBackground = "#D3D6E9";
 export const headerSelectedColor = "#333";
 export const headerBorderColor = "#DEE0EF";
 
-export const gridColor = "#D3D6E9";
+export const gridColor = "#E0E0E0";
 export const gridSeparatorColor = "#D3D6E9";
 export const defaultTextColor = "#2E414D";
 
@@ -16,3 +16,6 @@ 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;

webapp/src/components/WorksheetCanvas/worksheetCanvas.ts

@@ -1,10 +1,13 @@
 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,
@@ -30,6 +33,7 @@ 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;
@@ -40,7 +44,7 @@ export const fonts = {
   mono: '"Fira Mono", "Adjusted Courier New Fallback", serif',
 };
 
-export const headerRowHeight = 24;
+export const headerRowHeight = 28;
 export const headerColumnWidth = 30;
 export const devicePixelRatio = window.devicePixelRatio || 1;
 
@@ -48,6 +52,23 @@ 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;
 
@@ -61,6 +82,8 @@ export default class WorksheetCanvas {
 
   canvas: HTMLCanvasElement;
 
+  editor: HTMLDivElement;
+
   areaOutline: HTMLDivElement;
 
   cellOutline: HTMLDivElement;
@@ -92,6 +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;
@@ -469,9 +493,11 @@ 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: number;
       let textY: number;
@@ -487,14 +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) {
@@ -653,15 +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,
+        0.5,
-        topLeftCornerY + 1,
+        topLeftCornerY + 0.5,
-        headerColumnWidth - 2,
+        headerColumnWidth,
-        rowHeight - 2,
+        rowHeight - 1,
       );
       if (selected) {
         context.fillStyle = outlineColor;
@@ -1025,78 +1055,85 @@ export default class WorksheetCanvas {
       rowEnd,
       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;
+    extendToOutline.style.left = `${areaX}px`;
-    //   }
+    extendToOutline.style.top = `${areaY}px`;
-    //   case 'right': {
+    extendToOutline.style.width = `${areaWidth - 1}px`;
-    //     extendToOutline.style.borderRight = 'none';
+    extendToOutline.style.height = `${areaHeight - 1}px`;
-    //     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`;
   }
 
   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)
@@ -1106,8 +1143,8 @@ export default class WorksheetCanvas {
     }
 
     // Position the cell outline and clip it
-    cellOutline.style.left = `${x - padding}px`;
+    cellOutline.style.left = `${x - padding - 2}px`;
-    cellOutline.style.top = `${y - padding}px`;
+    cellOutline.style.top = `${y - padding - 2}px`;
     // Reset CSS properties
     cellOutline.style.minWidth = "";
     cellOutline.style.minHeight = "";
@@ -1115,18 +1152,11 @@ export default class WorksheetCanvas {
     cellOutline.style.maxHeight = "";
     cellOutline.style.overflow = "hidden";
     // New properties
-    cellOutline.style.width = `${width}px`;
+    cellOutline.style.width = `${width + 1}px`;
-    cellOutline.style.height = `${height}px`;
+    cellOutline.style.height = `${height + 1}px`;
-    if (cellEditing) {
+
-      cellOutline.style.fontWeight = style.font.b ? "bold" : "normal";
+    cellOutline.style.background = "none";
-      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";
-    }
     // border is 2px so line-height must be height - 4
     cellOutline.style.lineHeight = `${height - 4}px`;
     let {
@@ -1158,10 +1188,10 @@ export default class WorksheetCanvas {
       );
       handleX = areaX + areaWidth;
       handleY = areaY + areaHeight;
-      areaOutline.style.left = `${areaX - padding}px`;
+      areaOutline.style.left = `${areaX - padding - 1}px`;
-      areaOutline.style.top = `${areaY - padding}px`;
+      areaOutline.style.top = `${areaY - padding - 1}px`;
-      areaOutline.style.width = `${areaWidth + 2 * padding}px`;
+      areaOutline.style.width = `${areaWidth + 2 * padding + 1}px`;
-      areaOutline.style.height = `${areaHeight + 2 * padding}px`;
+      areaOutline.style.height = `${areaHeight + 2 * padding + 1}px`;
       const clipLeft = rowStart < topLeftCell.row && rowStart > frozenRows;
       const clipTop =
         columnStart < topLeftCell.column && columnStart > frozenColumns;
@@ -1202,25 +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 = `${handleX - handleWidth / 2}px`;
+    cellOutlineHandle.style.left = `${handleX - handleWidth / 2 - 1}px`;
-    cellOutlineHandle.style.top = `${handleY - handleHeight / 2}px`;
+    cellOutlineHandle.style.top = `${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();
@@ -1347,10 +1454,16 @@ export default class WorksheetCanvas {
     this.renderRowHeaders(frozenRows, topLeftCell, bottomRightCell);
 
     // square in the top left corner
-    context.fillStyle = headerBorderColor;
+    context.beginPath();
-    context.fillRect(0, 0, headerColumnWidth, headerRowHeight);
+    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();
   }
 }

webapp/src/components/borderPicker.tsx

@@ -7,7 +7,7 @@ import {
   PencilLine,
 } from "lucide-react";
 import type React from "react";
-import { useRef, useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import {
   BorderBottomIcon,
@@ -27,6 +27,7 @@ import ColorPicker from "./colorPicker";
 type BorderPickerProps = {
   className?: string;
   onChange: (border: BorderOptions) => void;
+  onClose: () => void;
   anchorEl: React.RefObject<HTMLElement>;
   anchorOrigin?: PopoverOrigin;
   transformOrigin?: PopoverOrigin;
@@ -36,25 +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" }
@@ -71,13 +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>
@@ -86,13 +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>
@@ -101,13 +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>
@@ -116,13 +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>
@@ -137,7 +146,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                   }
                 }}
                 disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.outer")}
               >
                 <BorderOuterIcon />
               </Button>
@@ -154,7 +163,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                   }
                 }}
                 disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.clear")}
               >
                 <BorderNoneIcon />
               </Button>
@@ -169,7 +178,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                   }
                 }}
                 disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.top")}
               >
                 <BorderTopIcon />
               </Button>
@@ -184,7 +193,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                   }
                 }}
                 disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.right")}
               >
                 <BorderRightIcon />
               </Button>
@@ -199,7 +208,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                   }
                 }}
                 disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.bottom")}
               >
                 <BorderBottomIcon />
               </Button>
@@ -214,7 +223,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                   }
                 }}
                 disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.left")}
               >
                 <BorderLeftIcon />
               </Button>
@@ -228,7 +237,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                 $pressed={false}
                 disabled={false}
                 ref={borderColorButton}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.color")}
               >
                 <PencilLine />
               </Button>
@@ -243,7 +252,7 @@ const BorderPicker = (properties: BorderPickerProps) => {
                 type="button"
                 $pressed={false}
                 disabled={false}
-                title={t("workbook.toolbar.borders_button_title")}
+                title={t("toolbar.borders.style")}
               >
                 <BorderStyleIcon />
               </Button>
@@ -371,22 +380,6 @@ const LineWrapper = styled("div")<LineWrapperProperties>`
   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;
@@ -474,7 +467,7 @@ const StyledPopover = styled(Popover)`
     padding: 0px;
   }
   font-family: ${({ theme }) => theme.typography.fontFamily};
-  font-size: 13px;
+  font-size: 12px;
 `;
 
 const BorderPickerDialog = styled("div")`
@@ -499,7 +492,7 @@ 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",
@@ -517,7 +510,7 @@ const Button = styled("button")<TypeButtonProperties>(
       borderTop: $underlinedColor ? "3px solid #FFF" : "none",
       borderBottom: $underlinedColor ? `3px solid ${$underlinedColor}` : "none",
       color: "#21243A",
-      backgroundColor: $pressed ? theme.palette.grey["600"] : "inherit",
+      backgroundColor: $pressed ? theme.palette.grey["200"] : "inherit",
       "&:hover": {
         backgroundColor: "#F1F2F8",
         borderTopColor: "#F1F2F8",

webapp/src/components/clipboard.ts

@@ -0,0 +1,2 @@
+export const getNewClipboardId = () => new Date().toISOString();
+export const CLIPBOARD_ID_SESSION_STORAGE_KEY = "IronCalc-Clipboard";

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;

webapp/src/components/editor/editor.tsx

@@ -0,0 +1,255 @@
+// This is the cell editor for IronCalc
+// It is also the single most difficult part of the UX. It is based on an idea of the
+// celebrated Polish developer Mateusz Kopec.
+// There is a hidden texarea and we only show the caret. What we see is a div with the same text content
+// but in HTML so we can have different colors.
+// Some keystrokes have different behaviour than a raw HTML text area.
+// For those cases we capture the keydown event and stop its propagation.
+// As the editor changes content we need to propagate those changes so the spreadsheet can
+// mark with colors the active ranges or update the formula in the formula bar
+//
+// Events outside the editor might influence the editor
+// 1. Clicking on a different cell:
+//    * might either terminate the editing
+//    * or add the external cell to the formula
+// 2. Clicking on a sheet tab would open the new sheet or terminate editing
+// 3. Clicking somewhere else will finish editing
+//
+// Keyboard navigation is also fairly complex. For instance RightArrow might:
+// 1. End editing and navigate to the cell on the right
+// 2. Move the cursor to the right
+// 3. Insert in the formula the cell name on the right
+
+// You can either be editing a formula or content.
+// When editing content (behaviour is common to Excel and Google Sheets):
+// * If you start editing by typing you are in *accept* mode
+// * If you start editing by F2 you are in *cruise* mode
+// * If you start editing by double click you are in *cruise* mode
+// In Google Sheets "Enter" starts editing and puts you in *cruise* mode. We do not do that
+// Once you are in cruise mode it is not possible to switch to accept mode
+// The only way to go from accept mode to cruise mode is clicking in the content somewhere
+
+// When editing a formula.
+// In Google Sheets you are either in insert mode or cruise mode.
+// You can get back to accept mode if you delete the whole formula
+// In Excel you can be either in insert or accept but if you click in the formula body
+// you switch to cruise mode. Once in cruise mode you can go to insert mode by selecting a range.
+// Then you are back in accept/insert modes
+
+import type { Model } from "@ironcalc/wasm";
+import {
+  type CSSProperties,
+  useCallback,
+  useEffect,
+  useRef,
+  useState,
+} from "react";
+import type { WorkbookState } from "../workbookState";
+import useKeyDown from "./useKeyDown";
+import getFormulaHTML from "./util";
+
+const commonCSS: CSSProperties = {
+  fontWeight: "inherit",
+  fontFamily: "inherit",
+  fontSize: "inherit",
+  position: "absolute",
+  left: 0,
+  top: 0,
+  whiteSpace: "pre",
+  width: "100%",
+  padding: 0,
+  lineHeight: "22px",
+};
+
+const caretColor = "rgb(242, 153, 74)";
+
+interface EditorOptions {
+  originalText: string;
+  onEditEnd: () => void;
+  onTextUpdated: () => void;
+  model: Model;
+  workbookState: WorkbookState;
+  type: "cell" | "formula-bar";
+}
+
+const Editor = (options: EditorOptions) => {
+  const { model, onEditEnd, onTextUpdated, originalText, workbookState, type } =
+    options;
+
+  const [text, setText] = useState(originalText);
+
+  const formulaRef = useRef<HTMLDivElement>(null);
+  const maskRef = useRef<HTMLDivElement>(null);
+  const textareaRef = useRef<HTMLTextAreaElement>(null);
+
+  useEffect(() => {
+    setText(originalText);
+    if (textareaRef.current) {
+      textareaRef.current.value = originalText;
+    }
+  }, [originalText]);
+
+  const { onKeyDown } = useKeyDown({
+    model,
+    onEditEnd,
+    onTextUpdated,
+    workbookState,
+    textareaRef,
+  });
+
+  useEffect(() => {
+    const cell = workbookState.getEditingCell();
+    if (!cell) {
+      return;
+    }
+    const { editorWidth, editorHeight } = cell;
+    if (formulaRef.current) {
+      const scrollWidth = formulaRef.current.scrollWidth;
+      if (scrollWidth > editorWidth - 5) {
+        cell.editorWidth = scrollWidth + 10;
+      }
+      const scrollHeight = formulaRef.current.scrollHeight;
+      if (scrollHeight > editorHeight) {
+        cell.editorHeight = scrollHeight;
+      }
+    }
+    if (type === cell.focus) {
+      textareaRef.current?.focus();
+    }
+  });
+
+  const onChange = useCallback(() => {
+    const textarea = textareaRef.current;
+    const cell = workbookState.getEditingCell();
+    if (!textarea || !cell) {
+      return;
+    }
+    const value = textarea.value;
+    cell.text = value;
+    cell.referencedRange = null;
+    cell.cursorStart = textarea.selectionStart;
+    cell.cursorEnd = textarea.selectionEnd;
+    const styledFormula = getFormulaHTML(model, value);
+    if (value === "" && type === "cell") {
+      // When we delete the content of a cell we jump to accept mode
+      cell.mode = "accept";
+    }
+    workbookState.setEditingCell(cell);
+
+    workbookState.setActiveRanges(styledFormula.activeRanges);
+    setText(cell.text);
+
+    onTextUpdated();
+
+    // Should we stop propagations?
+    // event.stopPropagation();
+    // event.preventDefault();
+  }, [workbookState, model, onTextUpdated, type]);
+
+  const onBlur = useCallback(() => {
+    const cell = workbookState.getEditingCell();
+    if (type !== cell?.focus) {
+      // If the onBlur event is called because we switch from the cell editor to the formula editor
+      // or vice versa, do nothing
+      return;
+    }
+    if (textareaRef.current) {
+      textareaRef.current.value = "";
+    }
+
+    // This happens if the blur hasn't been taken care before by
+    // onclick or onpointerdown events
+    // If we are editing a cell finish that
+    if (cell) {
+      model.setUserInput(
+        cell.sheet,
+        cell.row,
+        cell.column,
+        workbookState.getEditingText(),
+      );
+      workbookState.clearEditingCell();
+    }
+    onEditEnd();
+  }, [model, workbookState, onEditEnd, type]);
+
+  const cell = workbookState.getEditingCell();
+
+  const showEditor = cell !== null || type === "formula-bar" ? "block" : "none";
+  const mtext = cell ? workbookState.getEditingText() : originalText;
+  const styledFormula = getFormulaHTML(model, mtext).html;
+
+  return (
+    <div
+      style={{
+        position: "relative",
+        width: "100%",
+        height: "100%",
+        overflow: "hidden",
+        display: showEditor,
+        background: "#FFF",
+        fontFamily: "Inter",
+        fontSize: "13px",
+      }}
+    >
+      <div
+        ref={maskRef}
+        style={{
+          ...commonCSS,
+          textAlign: "left",
+          pointerEvents: "none",
+          height: "100%",
+        }}
+      >
+        <div
+          style={{
+            display: "inline-block",
+          }}
+          ref={formulaRef}
+        >
+          {styledFormula}
+        </div>
+      </div>
+      <textarea
+        ref={textareaRef}
+        rows={1}
+        style={{
+          ...commonCSS,
+          color: "transparent",
+          backgroundColor: "transparent",
+          caretColor,
+          outline: "none",
+          resize: "none",
+          border: "none",
+          height: "100%",
+          overflow: "hidden",
+          alignContent: "baseline",
+        }}
+        defaultValue={text}
+        spellCheck="false"
+        onKeyDown={onKeyDown}
+        onChange={onChange}
+        onBlur={onBlur}
+        onPointerDown={(event) => {
+          // We are either clicking in the same cell we are editing,
+          // in which case we just change the mode to edit, or we click
+          // in a different editor, in which case we switch the focus
+          const cell = workbookState.getEditingCell();
+          if (cell) {
+            // We make sure the mode is edit
+            cell.mode = "edit";
+            cell.focus = type;
+            workbookState.setEditingCell(cell);
+            event.stopPropagation();
+          }
+        }}
+        onScroll={() => {
+          if (maskRef.current && textareaRef.current) {
+            maskRef.current.style.left = `-${textareaRef.current.scrollLeft}px`;
+            maskRef.current.style.top = `-${textareaRef.current.scrollTop}px`;
+          }
+        }}
+      />
+    </div>
+  );
+};
+export default Editor;

webapp/src/components/editor/useKeyDown.ts

@@ -0,0 +1,401 @@
+import type { Model } from "@ironcalc/wasm";
+import { type KeyboardEvent, type RefObject, useCallback } from "react";
+import { rangeToStr } from "../util";
+import type { WorkbookState } from "../workbookState";
+import { isInReferenceMode } from "./util";
+
+interface Options {
+  model: Model;
+  onEditEnd: () => void;
+  onTextUpdated: () => void;
+  workbookState: WorkbookState;
+  textareaRef: RefObject<HTMLTextAreaElement>;
+}
+
+export const useKeyDown = (
+  options: Options,
+): { onKeyDown: (event: KeyboardEvent) => void } => {
+  const { model, onEditEnd, onTextUpdated, workbookState, textareaRef } =
+    options;
+  const onKeyDown = useCallback(
+    (event: KeyboardEvent) => {
+      const { key, shiftKey, altKey } = event;
+      const textarea = textareaRef.current;
+      const cell = workbookState.getEditingCell();
+      if (!textarea || !cell) {
+        return;
+      }
+      switch (key) {
+        case "Enter": {
+          if (altKey) {
+            // new line
+            const start = textarea.selectionStart;
+            const end = textarea.selectionEnd;
+            const value = textarea.value;
+            const newText = `${value.slice(0, start)}\n${value.slice(end)}`;
+            cell.text = newText;
+            workbookState.setEditingCell(cell);
+            setTimeout(() => {
+              textarea.setSelectionRange(start + 1, start + 1);
+            }, 0);
+            event.stopPropagation();
+            event.preventDefault();
+            onTextUpdated();
+            return;
+          }
+          event.stopPropagation();
+          event.preventDefault();
+          // end edit and select cell bellow (or above if shiftKey)
+          model.setUserInput(
+            cell.sheet,
+            cell.row,
+            cell.column,
+            cell.text + (cell.referencedRange?.str || ""),
+          );
+          const sign = shiftKey ? -1 : 1;
+          model.setSelectedSheet(cell.sheet);
+          model.setSelectedCell(cell.row + sign, cell.column);
+          workbookState.clearEditingCell();
+          onEditEnd();
+          return;
+        }
+        case "Tab": {
+          // end edit and select cell to the right (or left if ShiftKey)
+          workbookState.clearEditingCell();
+          model.setUserInput(
+            cell.sheet,
+            cell.row,
+            cell.column,
+            cell.text + (cell.referencedRange?.str || ""),
+          );
+          const sign = shiftKey ? -1 : 1;
+          model.setSelectedSheet(cell.sheet);
+          model.setSelectedCell(cell.row, cell.column + sign);
+          if (textareaRef.current) {
+            textareaRef.current.value = "";
+          }
+          event.stopPropagation();
+          event.preventDefault();
+
+          onEditEnd();
+          return;
+        }
+        case "Escape": {
+          // quit editing without modifying the cell
+          const cell = workbookState.getEditingCell();
+          if (cell) {
+            model.setSelectedSheet(cell.sheet);
+          }
+          workbookState.clearEditingCell();
+          onEditEnd();
+          return;
+        }
+        // TODO: Arrow keys navigate in Excel
+        case "ArrowRight": {
+          if (cell.mode === "edit") {
+            // just edit
+            return;
+          }
+          event.stopPropagation();
+          event.preventDefault();
+
+          if (cell.referencedRange) {
+            // There is already a reference range we move it to the right
+            // (or expand if shift is pressed)
+            const sheetNames = model
+              .getWorksheetsProperties()
+              .map((s) => s.name);
+            const range = cell.referencedRange.range;
+            if (shiftKey) {
+              range.columnEnd += 1;
+            } else {
+              const column = range.columnStart + 1;
+              const row = range.rowStart;
+              range.columnStart = column;
+              range.columnEnd = column;
+              range.rowEnd = row;
+            }
+            cell.referencedRange = {
+              range,
+              str: rangeToStr(range, cell.sheet, sheetNames[range.sheet]),
+            };
+            workbookState.setEditingCell(cell);
+            onTextUpdated();
+            return;
+          }
+          if (isInReferenceMode(cell.text, cell.cursorStart)) {
+            // there is not a referenced Range but we are in reference mode
+            // we select the next cell
+            const sheetNames = model
+              .getWorksheetsProperties()
+              .map((s) => s.name);
+            const range = {
+              sheet: cell.sheet,
+              rowStart: cell.row,
+              rowEnd: cell.row,
+              columnStart: cell.column + 1,
+              columnEnd: cell.column + 1,
+            };
+            cell.referencedRange = {
+              range,
+              str: rangeToStr(range, cell.sheet, sheetNames[range.sheet]),
+            };
+            workbookState.setEditingCell(cell);
+            onTextUpdated();
+            return;
+          }
+          // at this point we finish editing and select the cell to the right
+          // (or left if ShiftKey is pressed)
+          workbookState.clearEditingCell();
+          model.setUserInput(cell.sheet, cell.row, cell.column, cell.text);
+          model.setSelectedSheet(cell.sheet);
+          if (shiftKey) {
+            // TODO: ShiftKey
+          } else {
+            model.setSelectedCell(cell.row, cell.column + 1);
+          }
+          if (textareaRef.current) {
+            textareaRef.current.value = "";
+          }
+
+          onEditEnd();
+          return;
+        }
+        case "ArrowLeft": {
+          if (cell.mode === "edit") {
+            return;
+          }
+          event.stopPropagation();
+          event.preventDefault();
+          if (cell.referencedRange) {
+            // There is already a reference range we move it to the right
+            // (or expand if shift is pressed)
+            const sheetNames = model
+              .getWorksheetsProperties()
+              .map((s) => s.name);
+            const range = cell.referencedRange.range;
+            if (shiftKey) {
+              range.columnEnd -= 1;
+            } else {
+              const column = range.columnStart - 1;
+              const row = range.rowStart;
+              range.columnStart = column;
+              range.columnEnd = column;
+              range.rowEnd = row;
+            }
+            cell.referencedRange = {
+              range,
+              str: rangeToStr(range, cell.sheet, sheetNames[range.sheet]),
+            };
+            workbookState.setEditingCell(cell);
+            onTextUpdated();
+            return;
+          }
+          if (isInReferenceMode(cell.text, cell.cursorStart)) {
+            // there is not a referenced Range but we are in reference mode
+            // we select the next cell
+            const sheetNames = model
+              .getWorksheetsProperties()
+              .map((s) => s.name);
+            const range = {
+              sheet: cell.sheet,
+              rowStart: cell.row,
+              rowEnd: cell.row,
+              columnStart: cell.column - 1,
+              columnEnd: cell.column - 1,
+            };
+            cell.referencedRange = {
+              range,
+              str: rangeToStr(range, cell.sheet, sheetNames[range.sheet]),
+            };
+            workbookState.setEditingCell(cell);
+            onTextUpdated();
+            return;
+          }
+          // at this point we finish editing and select the cell to the right
+          // (or left if ShiftKey is pressed)
+          workbookState.clearEditingCell();
+          model.setUserInput(cell.sheet, cell.row, cell.column, cell.text);
+          model.setSelectedSheet(cell.sheet);
+          if (shiftKey) {
+            // TODO: ShiftKey
+          } else {
+            model.setSelectedCell(cell.row, cell.column - 1);
+          }
+          if (textareaRef.current) {
+            textareaRef.current.value = "";
+          }
+
+          onEditEnd();
+          return;
+        }
+        case "ArrowUp": {
+          if (cell.mode === "edit") {
+            return;
+          }
+          event.stopPropagation();
+          event.preventDefault();
+          if (cell.referencedRange) {
+            // There is already a reference range we move it to the right
+            // (or expand if shift is pressed)
+            const sheetNames = model
+              .getWorksheetsProperties()
+              .map((s) => s.name);
+            const range = cell.referencedRange.range;
+            if (shiftKey) {
+              if (range.rowEnd > range.rowStart) {
+                range.rowEnd -= 1;
+              } else {
+                range.rowStart -= 1;
+              }
+            } else {
+              const column = range.columnStart;
+              const row = range.rowStart - 1;
+              range.columnStart = column;
+              range.columnEnd = column;
+              range.rowStart = row;
+              range.rowEnd = row;
+            }
+            cell.referencedRange = {
+              range,
+              str: rangeToStr(range, cell.sheet, sheetNames[range.sheet]),
+            };
+            workbookState.setEditingCell(cell);
+            onTextUpdated();
+            return;
+          }
+          if (isInReferenceMode(cell.text, cell.cursorStart)) {
+            // there is not a referenced Range but we are in reference mode
+            // we select the next cell
+            const sheetNames = model
+              .getWorksheetsProperties()
+              .map((s) => s.name);
+            const range = {
+              sheet: cell.sheet,
+              rowStart: cell.row - 1,
+              rowEnd: cell.row - 1,
+              columnStart: cell.column,
+              columnEnd: cell.column,
+            };
+            cell.referencedRange = {
+              range,
+              str: rangeToStr(range, cell.sheet, sheetNames[range.sheet]),
+            };
+            workbookState.setEditingCell(cell);
+            onTextUpdated();
+            return;
+          }
+          // at this point we finish editing and select the cell to the right
+          // (or left if ShiftKey is pressed)
+          workbookState.clearEditingCell();
+          model.setUserInput(cell.sheet, cell.row, cell.column, cell.text);
+          model.setSelectedSheet(cell.sheet);
+          if (shiftKey) {
+            // TODO: ShiftKey
+          } else {
+            model.setSelectedCell(cell.row - 1, cell.column);
+          }
+          if (textareaRef.current) {
+            textareaRef.current.value = "";
+          }
+
+          onEditEnd();
+          return;
+        }
+        case "ArrowDown": {
+          if (cell.mode === "edit") {
+            return;
+          }
+          event.stopPropagation();
+          event.preventDefault();
+          if (cell.referencedRange) {
+            // There is already a reference range we move it to the right
+            // (or expand if shift is pressed)
+            const sheetNames = model
+              .getWorksheetsProperties()
+              .map((s) => s.name);
+            const range = cell.referencedRange.range;
+            if (shiftKey) {
+              range.rowEnd += 1;
+            } else {
+              const column = range.columnStart;
+              const row = range.rowStart + 1;
+              range.columnStart = column;
+              range.columnEnd = column;
+              range.rowStart = row;
+              range.rowEnd = row;
+            }
+            cell.referencedRange = {
+              range,
+              str: rangeToStr(range, cell.sheet, sheetNames[range.sheet]),
+            };
+            workbookState.setEditingCell(cell);
+            onTextUpdated();
+            return;
+          }
+          if (isInReferenceMode(cell.text, cell.cursorStart)) {
+            // there is not a referenced Range but we are in reference mode
+            // we select the next cell
+            const sheetNames = model
+              .getWorksheetsProperties()
+              .map((s) => s.name);
+            const range = {
+              sheet: cell.sheet,
+              rowStart: cell.row + 1,
+              rowEnd: cell.row + 1,
+              columnStart: cell.column,
+              columnEnd: cell.column,
+            };
+            cell.referencedRange = {
+              range,
+              str: rangeToStr(range, cell.sheet, sheetNames[range.sheet]),
+            };
+            workbookState.setEditingCell(cell);
+            onTextUpdated();
+            return;
+          }
+          // at this point we finish editing and select the cell to the right
+          // (or left if ShiftKey is pressed)
+          workbookState.clearEditingCell();
+          model.setUserInput(cell.sheet, cell.row, cell.column, cell.text);
+          model.setSelectedSheet(cell.sheet);
+          if (shiftKey) {
+            // TODO: ShiftKey
+          } else {
+            model.setSelectedCell(cell.row + 1, cell.column);
+          }
+          if (textareaRef.current) {
+            textareaRef.current.value = "";
+          }
+
+          onEditEnd();
+          return;
+        }
+        case "Shift": {
+          return;
+        }
+        case "PageDown":
+        case "PageUp": {
+          // TODO: We can do something similar to what we do with navigation keys
+          event.stopPropagation();
+          event.preventDefault();
+          return;
+        }
+        case "End":
+        case "Home": {
+          // Excel does something similar to what we do with navigation keys
+          cell.mode = "edit";
+          workbookState.setEditingCell(cell);
+          return;
+        }
+        default: {
+          // noop
+        }
+      }
+    },
+    [model, onEditEnd, onTextUpdated, workbookState, textareaRef.current],
+  );
+  return { onKeyDown };
+};
+
+export default useKeyDown;

webapp/src/components/editor/util.tsx

@@ -0,0 +1,189 @@
+import {
+  type Model,
+  type Range,
+  type Reference,
+  type TokenType,
+  getTokens,
+} from "@ironcalc/wasm";
+import type { ActiveRange } from "../workbookState";
+
+export function tokenIsReferenceType(token: TokenType): token is Reference {
+  return typeof token === "object" && "Reference" in token;
+}
+
+export function tokenIsRangeType(token: TokenType): token is Range {
+  return typeof token === "object" && "Range" in token;
+}
+
+export function isInReferenceMode(text: string, cursor: number): boolean {
+  // FIXME
+  // This is a gross oversimplification
+  // Returns true if both are true:
+  // 1. Cursor is at the end
+  // 2. Last char is one of [',', '(', '+', '*', '-', '/', '<', '>', '=', '&']
+  // This has many false positives like '="1+' and also likely some false negatives
+  // The right way of doing this is to have a partial parse of the formula tree
+  // and check if the next token could be a reference
+  if (!text.startsWith("=")) {
+    return false;
+  }
+  if (text === "=") {
+    return true;
+  }
+  const l = text.length;
+  const chars = [",", "(", "+", "*", "-", "/", "<", ">", "=", "&"];
+  if (cursor === l && chars.includes(text[l - 1])) {
+    return true;
+  }
+  return false;
+}
+
+// IronCalc 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]}, ${alpha})`;
+}
+
+function getFormulaHTML(
+  model: Model,
+  text: string,
+): { html: JSX.Element[]; activeRanges: ActiveRange[] } {
+  let html: JSX.Element[] = [];
+  const activeRanges: ActiveRange[] = [];
+  let colorCount = 0;
+  if (text.startsWith("=")) {
+    const formula = text.slice(1);
+    const tokens = getTokens(formula);
+    const tokenCount = tokens.length;
+    const usedColors: Record<string, string> = {};
+    const sheet = model.getSelectedSheet();
+    const sheetList = model.getWorksheetsProperties().map((s) => s.name);
+    for (let index = 0; index < tokenCount; index += 1) {
+      const { token, start, end } = tokens[index];
+      if (tokenIsReferenceType(token)) {
+        const { sheet: refSheet, row, column } = token.Reference;
+        const sheetIndex = refSheet ? sheetList.indexOf(refSheet) : sheet;
+        const key = `${sheetIndex}-${row}-${column}`;
+        let color = usedColors[key];
+        if (!color) {
+          color = getColor(colorCount);
+          usedColors[key] = color;
+          colorCount += 1;
+        }
+        html.push(
+          <span key={index} style={{ color }}>
+            {formula.slice(start, end)}
+          </span>,
+        );
+        activeRanges.push({
+          sheet: sheetIndex,
+          rowStart: row,
+          columnStart: column,
+          rowEnd: row,
+          columnEnd: column,
+          color,
+        });
+      } else if (tokenIsRangeType(token)) {
+        let {
+          sheet: refSheet,
+          left: { row: rowStart, column: columnStart },
+          right: { row: rowEnd, column: columnEnd },
+        } = token.Range;
+        const sheetIndex = refSheet ? sheetList.indexOf(refSheet) : sheet;
+
+        const key = `${sheetIndex}-${rowStart}-${columnStart}:${rowEnd}-${columnEnd}`;
+        let color = usedColors[key];
+        if (!color) {
+          color = getColor(colorCount);
+          usedColors[key] = color;
+          colorCount += 1;
+        }
+
+        if (rowStart > rowEnd) {
+          [rowStart, rowEnd] = [rowEnd, rowStart];
+        }
+        if (columnStart > columnEnd) {
+          [columnStart, columnEnd] = [columnEnd, columnStart];
+        }
+        html.push(
+          <span key={index} style={{ color }}>
+            {formula.slice(start, end)}
+          </span>,
+        );
+        colorCount += 1;
+
+        activeRanges.push({
+          sheet: sheetIndex,
+          rowStart,
+          columnStart,
+          rowEnd,
+          columnEnd,
+          color,
+        });
+      } else {
+        html.push(<span key={index}>{formula.slice(start, end)}</span>);
+      }
+    }
+    html = [<span key="equals">=</span>].concat(html);
+  } else {
+    html = [<span key="single">{text}</span>];
+  }
+  return { html, activeRanges };
+}
+
+export default getFormulaHTML;

webapp/src/components/formatMenu.tsx

@@ -1,5 +1,5 @@
 import { Menu, MenuItem, styled } from "@mui/material";
-import { type ComponentProps, useRef, useState } from "react";
+import { type ComponentProps, useCallback, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import FormatPicker from "./formatPicker";
 import { NumberFormats } from "./formatUtil";
@@ -14,11 +14,18 @@ type FormatMenuProps = {
 
 const FormatMenu = (properties: FormatMenuProps) => {
   const { t } = useTranslation();
-  const { onChange } = properties;
   const [isMenuOpen, setMenuOpen] = useState(false);
   const [isPickerOpen, setPickerOpen] = useState(false);
   const anchorElement = useRef<HTMLDivElement>(null);
 
+  const onSelect = useCallback(
+    (s: string) => {
+      properties.onChange(s);
+      setMenuOpen(false);
+    },
+    [properties.onChange],
+  );
+
   return (
     <>
       <ChildrenWrapper
@@ -33,18 +40,18 @@ const FormatMenu = (properties: FormatMenuProps) => {
         anchorEl={anchorElement.current}
         anchorOrigin={properties.anchorOrigin}
       >
-        <MenuItemWrapper onClick={(): void => onChange(NumberFormats.AUTO)}>
+        <MenuItemWrapper onClick={(): void => onSelect(NumberFormats.AUTO)}>
           <MenuItemText>{t("toolbar.format_menu.auto")}</MenuItemText>
         </MenuItemWrapper>
         <MenuDivider />
-        <MenuItemWrapper onClick={(): void => onChange(NumberFormats.NUMBER)}>
+        <MenuItemWrapper onClick={(): void => onSelect(NumberFormats.NUMBER)}>
           <MenuItemText>{t("toolbar.format_menu.number")}</MenuItemText>
           <MenuItemExample>
             {t("toolbar.format_menu.number_example")}
           </MenuItemExample>
         </MenuItemWrapper>
         <MenuItemWrapper
-          onClick={(): void => onChange(NumberFormats.PERCENTAGE)}
+          onClick={(): void => onSelect(NumberFormats.PERCENTAGE)}
         >
           <MenuItemText>{t("toolbar.format_menu.percentage")}</MenuItemText>
           <MenuItemExample>
@@ -54,7 +61,7 @@ const FormatMenu = (properties: FormatMenuProps) => {
 
         <MenuDivider />
         <MenuItemWrapper
-          onClick={(): void => onChange(NumberFormats.CURRENCY_EUR)}
+          onClick={(): void => onSelect(NumberFormats.CURRENCY_EUR)}
         >
           <MenuItemText>{t("toolbar.format_menu.currency_eur")}</MenuItemText>
           <MenuItemExample>
@@ -62,7 +69,7 @@ const FormatMenu = (properties: FormatMenuProps) => {
           </MenuItemExample>
         </MenuItemWrapper>
         <MenuItemWrapper
-          onClick={(): void => onChange(NumberFormats.CURRENCY_USD)}
+          onClick={(): void => onSelect(NumberFormats.CURRENCY_USD)}
         >
           <MenuItemText>{t("toolbar.format_menu.currency_usd")}</MenuItemText>
           <MenuItemExample>
@@ -70,7 +77,7 @@ const FormatMenu = (properties: FormatMenuProps) => {
           </MenuItemExample>
         </MenuItemWrapper>
         <MenuItemWrapper
-          onClick={(): void => onChange(NumberFormats.CURRENCY_GBP)}
+          onClick={(): void => onSelect(NumberFormats.CURRENCY_GBP)}
         >
           <MenuItemText>{t("toolbar.format_menu.currency_gbp")}</MenuItemText>
           <MenuItemExample>
@@ -80,7 +87,7 @@ const FormatMenu = (properties: FormatMenuProps) => {
 
         <MenuDivider />
         <MenuItemWrapper
-          onClick={(): void => onChange(NumberFormats.DATE_SHORT)}
+          onClick={(): void => onSelect(NumberFormats.DATE_SHORT)}
         >
           <MenuItemText>{t("toolbar.format_menu.date_short")}</MenuItemText>
           <MenuItemExample>
@@ -88,7 +95,7 @@ const FormatMenu = (properties: FormatMenuProps) => {
           </MenuItemExample>
         </MenuItemWrapper>
         <MenuItemWrapper
-          onClick={(): void => onChange(NumberFormats.DATE_LONG)}
+          onClick={(): void => onSelect(NumberFormats.DATE_LONG)}
         >
           <MenuItemText>{t("toolbar.format_menu.date_long")}</MenuItemText>
           <MenuItemExample>
@@ -103,7 +110,7 @@ const FormatMenu = (properties: FormatMenuProps) => {
       </Menu>
       <FormatPicker
         numFmt={properties.numFmt}
-        onChange={properties.onChange}
+        onChange={onSelect}
         open={isPickerOpen}
         onClose={(): void => setPickerOpen(false)}
         onExited={properties.onExited}
@@ -115,7 +122,7 @@ const FormatMenu = (properties: FormatMenuProps) => {
 const MenuItemWrapper = styled(MenuItem)`
   display: flex;
   justify-content: space-between;
-  font-size: 14px;
+  font-size: 12px;
   width: 100%;
 `;
 
@@ -130,6 +137,7 @@ const MenuItemText = styled("div")`
 `;
 
 const MenuItemExample = styled("div")`
+  color: #bdbdbd;
   margin-left: 20px;
 `;
 

webapp/src/components/formatPicker.tsx

@@ -35,6 +35,11 @@ const FormatPicker = (properties: FormatPickerProps) => {
           label={t("num_fmt.label")}
           name="format_code"
           onChange={(event) => setFormatCode(event.target.value)}
+          onKeyDown={(event) => {
+            event.stopPropagation();
+          }}
+          spellCheck="false"
+          onClick={(event) => event.stopPropagation()}
         />
       </DialogContent>
       <DialogActions>

webapp/src/components/formatUtil.ts

@@ -1,6 +1,12 @@
+// FIXME: These two should be done in the back end and thoroughly tested
+// * Dates shouldn't change
+// * General depends on the value. Increase(General, 0.5) => 0.50 and so on
+
 export function increaseDecimalPlaces(numberFormat: string): string {
-  // FIXME: Should it be done in the Rust? How should it work?
   // Increase decimal places for existing numbers with decimals
+  if (numberFormat === "general") {
+    return "#,##0.000";
+  }
   const newNumberFormat = numberFormat.replace(/\.0/g, ".00");
   // If no decimal places declared, add 0.0
   if (!newNumberFormat.includes(".")) {
@@ -10,13 +16,15 @@ export function increaseDecimalPlaces(numberFormat: string): string {
     if (newNumberFormat.includes("#")) {
       return newNumberFormat.replace(/#([^#,]|$)/g, "0.0$1");
     }
-    return "0.0";
+    return numberFormat;
   }
   return newNumberFormat;
 }
 
 export function decreaseDecimalPlaces(numberFormat: string): string {
-  // FIXME: Should it be done in the Rust? How should it work?
+  if (numberFormat === "general") {
+    return "#,##0.0";
+  }
   // Decrease decimal places for existing numbers with decimals
   let newNumberFormat = numberFormat.replace(/\.0/g, ".");
   // Fix leftover dots

webapp/src/components/formulaDialog.tsx

@@ -1,50 +0,0 @@
-import {
-  Button,
-  Dialog,
-  DialogActions,
-  DialogContent,
-  DialogTitle,
-  TextField,
-} from "@mui/material";
-import { useState } from "react";
-import { useTranslation } from "react-i18next";
-
-interface FormulaDialogProps {
-  isOpen: boolean;
-  close: () => void;
-  onFormulaChanged: (name: string) => void;
-  defaultFormula: string;
-}
-
-export const FormulaDialog = (properties: FormulaDialogProps) => {
-  const { t } = useTranslation();
-  const [formula, setFormula] = useState(properties.defaultFormula);
-  return (
-    <Dialog open={properties.isOpen} onClose={properties.close}>
-      <DialogTitle>{t("formula_input.title")}</DialogTitle>
-      <DialogContent dividers>
-        <TextField
-          defaultValue={formula}
-          label={t("formula_input.label")}
-          onClick={(event) => event.stopPropagation()}
-          onKeyDown={(event) => {
-            event.stopPropagation();
-          }}
-          onChange={(event) => {
-            setFormula(event.target.value);
-          }}
-          spellCheck="false"
-        />
-      </DialogContent>
-      <DialogActions>
-        <Button
-          onClick={() => {
-            properties.onFormulaChanged(formula);
-          }}
-        >
-          {t("formula_input.update")}
-        </Button>
-      </DialogActions>
-    </Dialog>
-  );
-};

webapp/src/components/formulabar.tsx

@@ -1,59 +1,88 @@
-import { Button, styled } from "@mui/material";
+import type { Model } from "@ironcalc/wasm";
-import { ChevronDown } from "lucide-react";
+import { styled } from "@mui/material";
-import { useState } from "react";
 import { Fx } from "../icons";
-import { FormulaDialog } from "./formulaDialog";
+import {
+  COLUMN_WIDTH_SCALE,
+  ROW_HEIGH_SCALE,
+} from "./WorksheetCanvas/constants";
+import { FORMULA_BAR_HEIGH } from "./constants";
+import Editor from "./editor/editor";
+import type { WorkbookState } from "./workbookState";
 
 type FormulaBarProps = {
   cellAddress: string;
   formulaValue: string;
-  onChange: (value: string) => void;
+  model: Model;
+  workbookState: WorkbookState;
+  onChange: () => void;
+  onTextUpdated: () => void;
 };
 
-const formulaBarHeight = 30;
+const headerColumnWidth = 35;
-const headerColumnWidth = 30;
 
 function FormulaBar(properties: FormulaBarProps) {
-  const [formulaDialogOpen, setFormulaDialogOpen] = useState(false);
+  const {
-  const handleCloseFormulaDialog = () => {
+    cellAddress,
-    setFormulaDialogOpen(false);
+    formulaValue,
-  };
+    model,
-
+    onChange,
+    onTextUpdated,
+    workbookState,
+  } = properties;
   return (
     <Container>
       <AddressContainer>
-        <CellBarAddress>{properties.cellAddress}</CellBarAddress>
+        <CellBarAddress>{cellAddress}</CellBarAddress>
-        <StyledButton>
-          <ChevronDown />
-        </StyledButton>
       </AddressContainer>
       <Divider />
       <FormulaContainer>
         <FormulaSymbolButton>
           <Fx />
         </FormulaSymbolButton>
-        <Editor
+        <EditorWrapper
-          onClick={() => {
+          onClick={(event) => {
-            setFormulaDialogOpen(true);
+            const [sheet, row, column] = model.getSelectedCell();
+            const editorWidth =
+              model.getColumnWidth(sheet, column) * COLUMN_WIDTH_SCALE;
+            const editorHeight =
+              model.getRowHeight(sheet, row) * ROW_HEIGH_SCALE;
+            workbookState.setEditingCell({
+              sheet,
+              row,
+              column,
+              text: formulaValue,
+              referencedRange: null,
+              cursorStart: formulaValue.length,
+              cursorEnd: formulaValue.length,
+              focus: "formula-bar",
+              activeRanges: [],
+              mode: "edit",
+              editorWidth,
+              editorHeight,
+            });
+            event.stopPropagation();
+            event.preventDefault();
           }}
         >
-          {properties.formulaValue}
+          <Editor
-        </Editor>
+            originalText={formulaValue}
+            model={model}
+            workbookState={workbookState}
+            onEditEnd={() => {
+              onChange();
+            }}
+            onTextUpdated={onTextUpdated}
+            type="formula-bar"
+          />
+        </EditorWrapper>
       </FormulaContainer>
-      <FormulaDialog
-        isOpen={formulaDialogOpen}
-        close={handleCloseFormulaDialog}
-        defaultFormula={properties.formulaValue}
-        onFormulaChanged={(newName) => {
-          properties.onChange(newName);
-          setFormulaDialogOpen(false);
-        }}
-      />
     </Container>
   );
 }
 
-const StyledButton = styled(Button)`
+const StyledButton = styled("div")`
+  display: inline-flex;
+  align-items: center;
   width: 15px;
   min-width: 0px;
   padding: 0px;
@@ -78,7 +107,7 @@ const Divider = styled("div")`
 `;
 
 const FormulaContainer = styled("div")`
-  margin-left: 10px;
+  margin-left: 0px;
   line-height: 22px;
   font-weight: normal;
   width: 100%;
@@ -93,7 +122,7 @@ const Container = styled("div")`
   align-items: center;
   background: ${(properties): string =>
     properties.theme.palette.background.default};
-  height: ${formulaBarHeight}px;
+  height: ${FORMULA_BAR_HEIGH}px;
 `;
 
 const AddressContainer = styled("div")`
@@ -113,7 +142,7 @@ const CellBarAddress = styled("div")`
   text-align: "center";
 `;
 
-const Editor = styled("div")`
+const EditorWrapper = styled("div")`
   position: relative;
   width: 100%;
   padding: 0px;
@@ -127,6 +156,7 @@ const Editor = styled("div")`
   span {
     min-width: 1px;
   }
+  font-family: monospace;
 `;
 
 export default FormulaBar;

webapp/src/components/navigation/menus.tsx

@@ -9,10 +9,15 @@ import {
 } from "@mui/material";
 import Menu from "@mui/material/Menu";
 import MenuItem from "@mui/material/MenuItem";
+import { Check } from "lucide-react";
 import { useState } from "react";
 import { useTranslation } from "react-i18next";
 import type { SheetOptions } from "./types";
 
+function isWhiteColor(color: string): boolean {
+  return ["#FFF", "#FFFFFF"].includes(color);
+}
+
 interface SheetRenameDialogProps {
   isOpen: boolean;
   close: () => void;
@@ -28,7 +33,7 @@ export const SheetRenameDialog = (properties: SheetRenameDialogProps) => {
       <DialogTitle>{t("sheet_rename.title")}</DialogTitle>
       <DialogContent dividers>
         <TextField
-          defaultValue={name}
+          defaultValue={properties.defaultName}
           label={t("sheet_rename.label")}
           onClick={(event) => event.stopPropagation()}
           onKeyDown={(event) => {
@@ -59,11 +64,20 @@ interface SheetListMenuProps {
   anchorEl: HTMLButtonElement | null;
   onSheetSelected: (index: number) => void;
   sheetOptionsList: SheetOptions[];
+  selectedIndex: number;
 }
 
 const SheetListMenu = (properties: SheetListMenuProps) => {
-  const { isOpen, close, anchorEl, onSheetSelected, sheetOptionsList } =
+  const {
-    properties;
+    isOpen,
+    close,
+    anchorEl,
+    onSheetSelected,
+    sheetOptionsList,
+    selectedIndex,
+  } = properties;
+
+  const hasColors = sheetOptionsList.some((tab) => !isWhiteColor(tab.color));
 
   return (
     <StyledMenu
@@ -82,10 +96,23 @@ const SheetListMenu = (properties: SheetListMenuProps) => {
       {sheetOptionsList.map((tab, index) => (
         <StyledMenuItem
           key={tab.sheetId}
-          onClick={(): void => onSheetSelected(index)}
+          onClick={() => onSheetSelected(index)}
         >
-          <ItemColor style={{ backgroundColor: tab.color }} />
+          {index === selectedIndex ? (
-          <ItemName>{tab.name}</ItemName>
+            <Check
+              style={{ width: "16px", height: "16px", marginRight: "8px" }}
+            />
+          ) : (
+            <div
+              style={{ width: "16px", height: "16px", marginRight: "8px" }}
+            />
+          )}
+          {hasColors && <ItemColor style={{ backgroundColor: tab.color }} />}
+          <ItemName
+            style={{ fontWeight: index === selectedIndex ? "bold" : "normal" }}
+          >
+            {tab.name}
+          </ItemName>
         </StyledMenuItem>
       ))}
     </StyledMenu>
@@ -115,7 +142,7 @@ const ItemColor = styled("div")`
 `;
 
 const ItemName = styled("div")`
-  font-size: 13px;
+  font-size: 12px;
   color: #333;
 `;
 

webapp/src/components/navigation/navigation.tsx

@@ -1,8 +1,10 @@
 import { styled } from "@mui/material";
-import { ChevronLeft, ChevronRight, Menu, Plus } from "lucide-react";
+import { Menu, Plus } from "lucide-react";
 import { useState } from "react";
 import { useTranslation } from "react-i18next";
+import { NAVIGATION_HEIGH } from "../constants";
 import { StyledButton } from "../toolbar";
+import type { WorkbookState } from "../workbookState";
 import SheetListMenu from "./menus";
 import Sheet from "./sheet";
 import type { SheetOptions } from "./types";
@@ -10,6 +12,7 @@ import type { SheetOptions } from "./types";
 export interface NavigationProps {
   sheets: SheetOptions[];
   selectedIndex: number;
+  workbookState: WorkbookState;
   onSheetSelected: (index: number) => void;
   onAddBlankSheet: () => void;
   onSheetColorChanged: (hex: string) => void;
@@ -19,7 +22,7 @@ export interface NavigationProps {
 
 function Navigation(props: NavigationProps) {
   const { t } = useTranslation();
-  const { onSheetSelected, sheets, selectedIndex } = props;
+  const { workbookState, onSheetSelected, sheets, selectedIndex } = props;
   const [anchorEl, setAnchorEl] = useState<null | HTMLButtonElement>(null);
   const open = Boolean(anchorEl);
   const handleClick = (event: React.MouseEvent<HTMLButtonElement>) => {
@@ -63,42 +66,29 @@ function Navigation(props: NavigationProps) {
               onDeleted={(): void => {
                 props.onSheetDeleted();
               }}
+              workbookState={workbookState}
             />
           ))}
         </SheetInner>
       </Sheets>
-      <LeftDivider />
+      <Advert href="https://www.ironcalc.com" target="_blank">
-      <ChevronLeftStyled />
+        ironcalc.com
-      <ChevronRightStyled />
+      </Advert>
-      <RightDivider />
-      <Advert>ironcalc.com</Advert>
       <SheetListMenu
         anchorEl={anchorEl}
         isOpen={open}
         close={handleClose}
         sheetOptionsList={sheets}
-        onSheetSelected={onSheetSelected}
+        onSheetSelected={(index) => {
+          onSheetSelected(index);
+          handleClose();
+        }}
+        selectedIndex={selectedIndex}
       />
     </Container>
   );
 }
 
-const ChevronLeftStyled = styled(ChevronLeft)`
-  color: #333333;
-  width: 16px;
-  height: 16px;
-  padding: 4px;
-  cursor: pointer;
-`;
-
-const ChevronRightStyled = styled(ChevronRight)`
-  color: #333333;
-  width: 16px;
-  height: 16px;
-  padding: 4px;
-  cursor: pointer;
-`;
-
 // Note I have to specify the font-family in every component that can be considered stand-alone
 const Container = styled("div")`
   position: absolute;
@@ -106,11 +96,12 @@ const Container = styled("div")`
   left: 0px;
   right: 0px;
   display: flex;
-  height: 40px;
+  height: ${NAVIGATION_HEIGH}px;
   align-items: center;
   padding-left: 12px;
   font-family: Inter;
   background-color: #fff;
+  border-top: 1px solid #E0E0E0;
 `;
 
 const Sheets = styled("div")`
@@ -122,24 +113,11 @@ const SheetInner = styled("div")`
   display: flex;
 `;
 
-const LeftDivider = styled("div")`
+const Advert = styled("a")`
-  height: 10px;
-  width: 1px;
-  background-color: #eee;
-  margin: 0px 10px 0px 0px;
-`;
-
-const RightDivider = styled("div")`
-  height: 10px;
-  width: 1px;
-  background-color: #eee;
-  margin: 0px 20px 0px 10px;
-`;
-
-const Advert = styled("div")`
   color: #f2994a;
   margin-right: 12px;
   font-size: 12px;
+  text-decoration: none;
 `;
 
 export default Navigation;

webapp/src/components/navigation/sheet.tsx

@@ -2,7 +2,10 @@ import { Button, Menu, MenuItem, styled } from "@mui/material";
 import { ChevronDown } from "lucide-react";
 import { useRef, useState } from "react";
 import ColorPicker from "../colorPicker";
+import { isInReferenceMode } from "../editor/util";
+import type { WorkbookState } from "../workbookState";
 import { SheetRenameDialog } from "./menus";
+
 interface SheetProps {
   name: string;
   color: string;
@@ -11,9 +14,11 @@ interface SheetProps {
   onColorChanged: (hex: string) => void;
   onRenamed: (name: string) => void;
   onDeleted: () => void;
+  workbookState: WorkbookState;
 }
+
 function Sheet(props: SheetProps) {
-  const { name, color, selected, onSelected } = props;
+  const { name, color, selected, workbookState, onSelected } = props;
   const [anchorEl, setAnchorEl] = useState<null | HTMLButtonElement>(null);
   const [colorPickerOpen, setColorPickerOpen] = useState(false);
   const colorButton = useRef(null);
@@ -35,8 +40,18 @@ function Sheet(props: SheetProps) {
     <>
       <Wrapper
         style={{ borderBottomColor: color, fontWeight: selected ? 600 : 400 }}
-        onClick={() => {
+        onClick={(event) => {
           onSelected();
+          event.stopPropagation();
+          event.preventDefault();
+        }}
+        onPointerDown={(event) => {
+          // If it is in browse mode stop he event
+          const cell = workbookState.getEditingCell();
+          if (cell && isInReferenceMode(cell.text, cell.cursorStart)) {
+            event.stopPropagation();
+            event.preventDefault();
+          }
         }}
         ref={colorButton}
       >
@@ -58,23 +73,23 @@ function Sheet(props: SheetProps) {
           horizontal: 6,
         }}
       >
-        <MenuItem
+        <StyledMenuItem
           onClick={() => {
             handleOpenRenameDialog();
             handleClose();
           }}
         >
           Rename
-        </MenuItem>
+        </StyledMenuItem>
-        <MenuItem
+        <StyledMenuItem
           onClick={() => {
             setColorPickerOpen(true);
             handleClose();
           }}
         >
           Change Color
-        </MenuItem>
+        </StyledMenuItem>
-        <MenuItem
+        <StyledMenuItem
           onClick={() => {
             props.onDeleted();
             handleClose();
@@ -82,7 +97,7 @@ function Sheet(props: SheetProps) {
         >
           {" "}
           Delete
-        </MenuItem>
+        </StyledMenuItem>
       </StyledMenu>
       <SheetRenameDialog
         isOpen={renameDialogOpen}
@@ -111,6 +126,10 @@ function Sheet(props: SheetProps) {
 
 const StyledMenu = styled(Menu)``;
 
+const StyledMenuItem = styled(MenuItem)`
+  font-size: 12px;
+`;
+
 const StyledButton = styled(Button)`
   width: 15px;
   height: 24px;
@@ -131,6 +150,7 @@ const Wrapper = styled("div")`
   border-top: 3px solid white;
   line-height: 34px;
   align-items: center;
+  cursor: pointer;
 `;
 
 const Name = styled("div")`

webapp/src/components/tests/model.test.ts

@@ -7,7 +7,7 @@ import { expect, test } from "vitest";
 test("simple calculation", async () => {
   const buffer = await readFile("node_modules/@ironcalc/wasm/wasm_bg.wasm");
   initSync(buffer);
-  const model = new Model("en", "UTC");
+  const model = new Model("workbook", "en", "UTC");
   model.setUserInput(0, 1, 1, "=21*2");
   expect(model.getFormattedCellValue(0, 1, 1)).toBe("42");
 });

webapp/src/components/tests/util.test.ts

@@ -1,7 +1,26 @@
 import { expect, test } from "vitest";
+import { decreaseDecimalPlaces, increaseDecimalPlaces } from "../formatUtil";
 import { isNavigationKey } from "../util";
 
 test("checks arrow left is a navigation key", () => {
   expect(isNavigationKey("ArrowLeft")).toBe(true);
   expect(isNavigationKey("Arrow")).toBe(false);
 });
+
+test("increase decimals", () => {
+  expect(increaseDecimalPlaces('"€"#,##0.00'), '"€"#,##0.000');
+  expect(increaseDecimalPlaces("general"), "#,##0.000");
+  expect(
+    increaseDecimalPlaces('dddd"," mmmm dd"," yyyy'),
+    'dddd"," mmmm dd"," yyyy',
+  );
+});
+
+test("decrease decimals", () => {
+  expect(decreaseDecimalPlaces('"€"#,##0.00'), '"€"#,##0.0');
+  expect(decreaseDecimalPlaces("general"), "#,##0.0");
+  expect(
+    decreaseDecimalPlaces('dddd"," mmmm dd"," yyyy'),
+    'dddd"," mmmm dd"," yyyy',
+  );
+});

webapp/src/components/toolbar.tsx

@@ -36,6 +36,7 @@ import {
 import { theme } from "../theme";
 import BorderPicker from "./borderPicker";
 import ColorPicker from "./colorPicker";
+import { TOOLBAR_HEIGH } from "./constants";
 import FormatMenu from "./formatMenu";
 import {
   NumberFormats,
@@ -223,7 +224,7 @@ function Toolbar(properties: ToolbarProperties) {
         $pressed={properties.strike}
         onClick={() => properties.onToggleStrike(!properties.strike)}
         disabled={!canEdit}
-        title={t("toolbar.strike_trough")}
+        title={t("toolbar.strike_through")}
       >
         <Strikethrough />
       </StyledButton>
@@ -293,11 +294,7 @@ function Toolbar(properties: ToolbarProperties) {
       <StyledButton
         type="button"
         $pressed={properties.verticalAlign === "top"}
-        onClick={() =>
+        onClick={() => properties.onToggleVerticalAlign("top")}
-          properties.onToggleVerticalAlign(
-            properties.verticalAlign === "top" ? "bottom" : "top",
-          )
-        }
         disabled={!canEdit}
         title={t("toolbar.vertical_align_top")}
       >
@@ -306,13 +303,9 @@ function Toolbar(properties: ToolbarProperties) {
       <StyledButton
         type="button"
         $pressed={properties.verticalAlign === "center"}
-        onClick={() =>
+        onClick={() => properties.onToggleVerticalAlign("center")}
-          properties.onToggleVerticalAlign(
-            properties.verticalAlign === "center" ? "bottom" : "center",
-          )
-        }
         disabled={!canEdit}
-        title={t("toolbar.vertical_align_center")}
+        title={t("toolbar.vertical_align_middle")}
       >
         <ArrowMiddleFromLine />
       </StyledButton>
@@ -332,7 +325,7 @@ function Toolbar(properties: ToolbarProperties) {
         onClick={() => setBorderPickerOpen(true)}
         ref={borderButton}
         disabled={!canEdit}
-        title={t("toolbar.borders")}
+        title={t("toolbar.borders.title")}
       >
         <Grid2X2 />
       </StyledButton>
@@ -376,6 +369,8 @@ function Toolbar(properties: ToolbarProperties) {
       <BorderPicker
         onChange={(border): void => {
           properties.onBorderChanged(border);
+        }}
+        onClose={() => {
           setBorderPickerOpen(false);
         }}
         anchorEl={borderButton}
@@ -384,19 +379,19 @@ function Toolbar(properties: ToolbarProperties) {
     </ToolbarContainer>
   );
 }
-const toolbarHeight = 40;
 
 const ToolbarContainer = styled("div")`
   display: flex;
   flex-shrink: 0;
   align-items: center;
   background: ${({ theme }) => theme.palette.background.paper};
-  height: ${toolbarHeight}px;
+  height: ${TOOLBAR_HEIGH}px;
-  line-height: ${toolbarHeight}px;
+  line-height: ${TOOLBAR_HEIGH}px;
-  border-bottom: 1px solid ${({ theme }) => theme.palette.grey["600"]};
+  border-bottom: 1px solid ${({ theme }) => theme.palette.grey["300"]};
   font-family: Inter;
   border-radius: 4px 4px 0px 0px;
   overflow-x: auto;
+  padding-left: 11px;
 `;
 
 type TypeButtonProperties = { $pressed: boolean; $underlinedColor?: string };
@@ -445,7 +440,7 @@ export const StyledButton = styled("button")<TypeButtonProperties>(
 const Divider = styled("div")({
   width: "0px",
   height: "10px",
-  borderLeft: "1px solid #D3D6E9",
+  borderLeft: "1px solid #E0E0E0",
   marginLeft: "5px",
   marginRight: "10px",
 });

webapp/src/components/useKeyboardNavigation.ts

@@ -31,6 +31,7 @@ interface Options {
   onRedo: () => void;
   onNextSheet: () => void;
   onPreviousSheet: () => void;
+  onEscape: () => void;
   root: RefObject<HTMLDivElement>;
 }
 
@@ -212,6 +213,9 @@ const useKeyboardNavigation = (
 
           break;
         }
+        case "Escape": {
+          options.onEscape();
+        }
         // No default
       }
       event.stopPropagation();

webapp/src/components/usePointer.ts

@@ -1,10 +1,14 @@
+import type { Model } from "@ironcalc/wasm";
 import { type PointerEvent, type RefObject, useCallback, useRef } from "react";
 import type WorksheetCanvas from "./WorksheetCanvas/worksheetCanvas";
 import {
   headerColumnWidth,
   headerRowHeight,
 } from "./WorksheetCanvas/worksheetCanvas";
+import { isInReferenceMode } from "./editor/util";
 import type { Cell } from "./types";
+import { rangeToStr } from "./util";
+import type { WorkbookState } from "./workbookState";
 
 interface PointerSettings {
   canvasElement: RefObject<HTMLCanvasElement>;
@@ -15,6 +19,9 @@ interface PointerSettings {
   onAreaSelected: () => void;
   onExtendToCell: (cell: Cell) => void;
   onExtendToEnd: () => void;
+  model: Model;
+  workbookState: WorkbookState;
+  refresh: () => void;
 }
 
 interface PointerEvents {
@@ -27,6 +34,7 @@ interface PointerEvents {
 const usePointer = (options: PointerSettings): PointerEvents => {
   const isSelecting = useRef(false);
   const isExtending = useRef(false);
+  const isInsertingRef = useRef(false);
 
   const onPointerMove = useCallback(
     (event: PointerEvent): void => {
@@ -36,43 +44,50 @@ const usePointer = (options: PointerSettings): PointerEvents => {
         return;
       }
 
+      if (
+        !(isSelecting.current || isExtending.current || isInsertingRef.current)
+      ) {
+        return;
+      }
+      const { canvasElement, model, worksheetCanvas } = options;
+      const canvas = canvasElement.current;
+      const worksheet = worksheetCanvas.current;
+      // Silence the linter
+      if (!worksheet || !canvas) {
+        return;
+      }
+      const canvasRect = canvas.getBoundingClientRect();
+      const x = event.clientX - canvasRect.x;
+      const y = event.clientY - canvasRect.y;
+
+      const cell = worksheet.getCellByCoordinates(x, y);
+      if (!cell) {
+        return;
+      }
+
       if (isSelecting.current) {
-        const { canvasElement, worksheetCanvas } = options;
+        options.onAreaSelecting(cell);
-        const canvas = canvasElement.current;
-        const worksheet = worksheetCanvas.current;
-        // Silence the linter
-        if (!worksheet || !canvas) {
-          return;
-        }
-        let x = event.clientX;
-        let y = event.clientY;
-        const canvasRect = canvas.getBoundingClientRect();
-        x -= canvasRect.x;
-        y -= canvasRect.y;
-        const cell = worksheet.getCellByCoordinates(x, y);
-        if (cell) {
-          options.onAreaSelecting(cell);
-        } else {
-          console.log("Failed");
-        }
       } else if (isExtending.current) {
-        const { canvasElement, worksheetCanvas } = options;
-        const canvas = canvasElement.current;
-        const worksheet = worksheetCanvas.current;
-        // Silence the linter
-        if (!worksheet || !canvas) {
-          return;
-        }
-        let x = event.clientX;
-        let y = event.clientY;
-        const canvasRect = canvas.getBoundingClientRect();
-        x -= canvasRect.x;
-        y -= canvasRect.y;
-        const cell = worksheet.getCellByCoordinates(x, y);
-        if (!cell) {
-          return;
-        }
         options.onExtendToCell(cell);
+      } else if (isInsertingRef.current) {
+        const { refresh, workbookState } = options;
+        const editingCell = workbookState.getEditingCell();
+        if (!editingCell || !editingCell.referencedRange) {
+          return;
+        }
+        const range = editingCell.referencedRange.range;
+        range.rowEnd = cell.row;
+        range.columnEnd = cell.column;
+
+        const sheetNames = model.getWorksheetsProperties().map((s) => s.name);
+
+        editingCell.referencedRange.str = rangeToStr(
+          range,
+          editingCell.sheet,
+          sheetNames[range.sheet],
+        );
+        workbookState.setEditingCell(editingCell);
+        refresh();
       }
     },
     [options],
@@ -90,6 +105,10 @@ const usePointer = (options: PointerSettings): PointerEvents => {
         isExtending.current = false;
         worksheetElement.current?.releasePointerCapture(event.pointerId);
         options.onExtendToEnd();
+      } else if (isInsertingRef.current) {
+        const { worksheetElement } = options;
+        isInsertingRef.current = false;
+        worksheetElement.current?.releasePointerCapture(event.pointerId);
       }
     },
     [options],
@@ -99,7 +118,14 @@ const usePointer = (options: PointerSettings): PointerEvents => {
     (event: PointerEvent) => {
       let x = event.clientX;
       let y = event.clientY;
-      const { canvasElement, worksheetElement, worksheetCanvas } = options;
+      const {
+        canvasElement,
+        model,
+        refresh,
+        worksheetElement,
+        worksheetCanvas,
+        workbookState,
+      } = options;
       const worksheet = worksheetCanvas.current;
       const canvas = canvasElement.current;
       const worksheetWrapper = worksheetElement.current;
@@ -132,8 +158,60 @@ const usePointer = (options: PointerSettings): PointerEvents => {
         }
         return;
       }
+
+      const editingCell = workbookState.getEditingCell();
       const cell = worksheet.getCellByCoordinates(x, y);
       if (cell) {
+        if (editingCell) {
+          if (
+            cell.row === editingCell.row &&
+            cell.column === editingCell.column
+          ) {
+            // We are clicking on the cell we are editing
+            // we do nothing
+            return;
+          }
+          // now we are editing one cell and we click in another one
+          // If we can insert a range we do that
+          const text = editingCell.text;
+          if (isInReferenceMode(text, editingCell.cursorEnd)) {
+            const range = {
+              sheet: model.getSelectedSheet(),
+              rowStart: cell.row,
+              rowEnd: cell.row,
+              columnStart: cell.column,
+              columnEnd: cell.column,
+            };
+            const sheetNames = model
+              .getWorksheetsProperties()
+              .map((s) => s.name);
+            editingCell.referencedRange = {
+              range,
+              str: rangeToStr(
+                range,
+                editingCell.sheet,
+                sheetNames[range.sheet],
+              ),
+            };
+            workbookState.setEditingCell(editingCell);
+            event.stopPropagation();
+            event.preventDefault();
+            isInsertingRef.current = true;
+            worksheetWrapper.setPointerCapture(event.pointerId);
+            refresh();
+            return;
+          }
+          // We are clicking away but we are not in reference mode
+          // We finish the editing
+          workbookState.clearEditingCell();
+          model.setUserInput(
+            editingCell.sheet,
+            editingCell.row,
+            editingCell.column,
+            editingCell.text,
+          );
+          // we continue to select the new cell
+        }
         options.onCellSelected(cell, event);
         isSelecting.current = true;
         worksheetWrapper.setPointerCapture(event.pointerId);

webapp/src/components/util.ts

@@ -29,14 +29,35 @@ export const isNavigationKey = (key: string): key is NavigationKey =>
     key,
   );
 
-export const getCellAddress = (selectedArea: Area, selectedCell?: Cell) => {
+export const getCellAddress = (selectedArea: Area, selectedCell: Cell) => {
   const isSingleCell =
     selectedArea.rowStart === selectedArea.rowEnd &&
     selectedArea.columnEnd === selectedArea.columnStart;
 
-  return isSingleCell && selectedCell
+  return isSingleCell
     ? `${columnNameFromNumber(selectedCell.column)}${selectedCell.row}`
     : `${columnNameFromNumber(selectedArea.columnStart)}${
         selectedArea.rowStart
       }:${columnNameFromNumber(selectedArea.columnEnd)}${selectedArea.rowEnd}`;
 };
+
+export function rangeToStr(
+  range: {
+    sheet: number;
+    rowStart: number;
+    rowEnd: number;
+    columnStart: number;
+    columnEnd: number;
+  },
+  referenceSheet: number,
+  referenceName: string,
+): string {
+  const { sheet, rowStart, rowEnd, columnStart, columnEnd } = range;
+  const sheetName = sheet === referenceSheet ? "" : `'${referenceName}'!`;
+  if (rowStart === rowEnd && columnStart === columnEnd) {
+    return `${sheetName}${columnNameFromNumber(columnStart)}${rowStart}`;
+  }
+  return `${sheetName}${columnNameFromNumber(
+    columnStart,
+  )}${rowStart}:${columnNameFromNumber(columnEnd)}${rowEnd}`;
+}

webapp/src/components/workbook.tsx

@@ -1,7 +1,20 @@
-import type { BorderOptions, Model, WorksheetProperties } from "@ironcalc/wasm";
+import type {
+  BorderOptions,
+  ClipboardCell,
+  Model,
+  WorksheetProperties,
+} from "@ironcalc/wasm";
 import { styled } from "@mui/material/styles";
-import { useEffect, useRef, useState } from "react";
+import { useCallback, useEffect, useRef, useState } from "react";
-import { LAST_COLUMN } from "./WorksheetCanvas/constants";
+import {
+  COLUMN_WIDTH_SCALE,
+  LAST_COLUMN,
+  ROW_HEIGH_SCALE,
+} from "./WorksheetCanvas/constants";
+import {
+  CLIPBOARD_ID_SESSION_STORAGE_KEY,
+  getNewClipboardId,
+} from "./clipboard";
 import FormulaBar from "./formulabar";
 import Navigation from "./navigation/navigation";
 import Toolbar from "./toolbar";
@@ -15,14 +28,27 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
   const rootRef = useRef<HTMLDivElement>(null);
 
   // Calling `setRedrawId((id) => id + 1);` forces a redraw
-  // This is needed because `model` can change without React being aware of it
+  // This is needed because `model` or `workbookState` can change without React being aware of it
   const setRedrawId = useState(0)[1];
   const info = model
     .getWorksheetsProperties()
     .map(({ name, color, sheet_id }: WorksheetProperties) => {
       return { name, color: color ? color : "#FFF", sheetId: sheet_id };
     });
-
+  const focusWorkbook = useCallback(() => {
+    if (rootRef.current) {
+      rootRef.current.focus();
+      // HACK: We need to select something inside the root for onCopy to work
+      const selection = window.getSelection();
+      if (selection) {
+        selection.empty();
+        const range = new Range();
+        range.setStart(rootRef.current.firstChild as Node, 0);
+        range.setEnd(rootRef.current.firstChild as Node, 0);
+        selection.addRange(range);
+      }
+    }
+  }, []);
   const onRedo = () => {
     model.redo();
     setRedrawId((id) => id + 1);
@@ -125,8 +151,8 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
       const row = Math.min(rowStart, rowEnd);
       const column = Math.min(columnStart, columnEnd);
 
-      const width = Math.abs(columnEnd - columnStart) + 1;
+      const width = Math.abs(columnEnd - columnStart);
-      const height = Math.abs(rowEnd - rowStart) + 1;
+      const height = Math.abs(rowEnd - rowStart);
       model.rangeClearContents(
         sheet,
         row,
@@ -143,11 +169,48 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
       setRedrawId((id) => id + 1);
     },
     onEditKeyPressStart: (initText: string): void => {
-      console.log(initText);
+      const { sheet, row, column } = model.getSelectedView();
-      throw new Error("Function not implemented.");
+      const editorWidth =
+        model.getColumnWidth(sheet, column) * COLUMN_WIDTH_SCALE;
+      const editorHeight = model.getRowHeight(sheet, row) * ROW_HEIGH_SCALE;
+      workbookState.setEditingCell({
+        sheet,
+        row,
+        column,
+        text: initText,
+        cursorStart: initText.length,
+        cursorEnd: initText.length,
+        focus: "cell",
+        referencedRange: null,
+        activeRanges: [],
+        mode: "accept",
+        editorWidth,
+        editorHeight,
+      });
+      setRedrawId((id) => id + 1);
     },
     onCellEditStart: (): void => {
-      throw new Error("Function not implemented.");
+      // User presses F2, we start editing at the edn of the text
+      const { sheet, row, column } = model.getSelectedView();
+      const text = model.getCellContent(sheet, row, column);
+      const editorWidth =
+        model.getColumnWidth(sheet, column) * COLUMN_WIDTH_SCALE;
+      const editorHeight = model.getRowHeight(sheet, row) * ROW_HEIGH_SCALE;
+      workbookState.setEditingCell({
+        sheet,
+        row,
+        column,
+        text,
+        cursorStart: text.length,
+        cursorEnd: text.length,
+        referencedRange: null,
+        focus: "cell",
+        activeRanges: [],
+        mode: "edit",
+        editorWidth,
+        editorHeight,
+      });
+      setRedrawId((id) => id + 1);
     },
     onBold: () => {
       const { sheet, row, column } = model.getSelectedView();
@@ -230,6 +293,10 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
         model.setSelectedSheet(nextSheet);
       }
     },
+    onEscape: (): void => {
+      workbookState.clearCutRange();
+      setRedrawId((id) => id + 1);
+    },
     root: rootRef,
   });
 
@@ -237,26 +304,197 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
     if (!rootRef.current) {
       return;
     }
-    rootRef.current.focus();
+    if (!workbookState.getEditingCell()) {
+      focusWorkbook();
+    }
   });
 
-  const {
+  const cellAddress = useCallback(() => {
-    sheet,
+    const {
-    row,
+      row,
-    column,
+      column,
-    range: [rowStart, columnStart, rowEnd, columnEnd],
+      range: [rowStart, columnStart, rowEnd, columnEnd],
-  } = model.getSelectedView();
+    } = model.getSelectedView();
+    return getCellAddress(
+      { rowStart, rowEnd, columnStart, columnEnd },
+      { row, column },
+    );
+  }, [model]);
 
-  const cellAddress = getCellAddress(
+  const formulaValue = () => {
-    { rowStart, rowEnd, columnStart, columnEnd },
+    const cell = workbookState.getEditingCell();
-    { row, column },
+    if (cell) {
-  );
+      return workbookState.getEditingText();
-  const formulaValue = model.getCellContent(sheet, row, column);
+    }
+    const { sheet, row, column } = model.getSelectedView();
+    return model.getCellContent(sheet, row, column);
+  };
 
-  const style = model.getCellStyle(sheet, row, column);
+  const getCellStyle = useCallback(() => {
+    const { sheet, row, column } = model.getSelectedView();
+    return model.getCellStyle(sheet, row, column);
+  }, [model]);
+
+  const style = getCellStyle();
 
   return (
-    <Container ref={rootRef} onKeyDown={onKeyDown} tabIndex={0}>
+    <Container
+      ref={rootRef}
+      onKeyDown={onKeyDown}
+      tabIndex={0}
+      onClick={(event) => {
+        if (!workbookState.getEditingCell()) {
+          focusWorkbook();
+        } else {
+          event.stopPropagation();
+        }
+      }}
+      onPaste={(event: React.ClipboardEvent) => {
+        workbookState.clearCutRange();
+        const { items } = event.clipboardData;
+        if (!items) {
+          return;
+        }
+        const mimeTypes = [
+          "application/json",
+          "text/plain",
+          "text/csv",
+          "text/html",
+        ];
+        let mimeType = null;
+        let value = null;
+        for (let index = 0; index < mimeTypes.length; index += 1) {
+          mimeType = mimeTypes[index];
+          value = event.clipboardData.getData(mimeType);
+          if (value) {
+            break;
+          }
+        }
+        if (!mimeType || !value) {
+          // No clipboard data to paste
+          return;
+        }
+        if (mimeType === "application/json") {
+          // We are copying from within the application
+          const source = JSON.parse(value);
+          // const clipboardId = sessionStorage.getItem(
+          //   CLIPBOARD_ID_SESSION_STORAGE_KEY
+          // );
+          const data: Map<number, Map<number, ClipboardCell>> = new Map();
+          const sheetData = source.sheetData;
+          for (const row of Object.keys(sheetData)) {
+            const dataRow = sheetData[row];
+            const rowMap = new Map();
+            for (const column of Object.keys(dataRow)) {
+              rowMap.set(Number.parseInt(column, 10), dataRow[column]);
+            }
+            data.set(Number.parseInt(row, 10), rowMap);
+          }
+          model.pasteFromClipboard(source.area, data, source.type === "cut");
+          setRedrawId((id) => id + 1);
+        } else if (mimeType === "text/plain") {
+          const {
+            sheet,
+            range: [rowStart, columnStart, rowEnd, columnEnd],
+          } = model.getSelectedView();
+          const row = Math.min(rowStart, rowEnd);
+          const column = Math.min(columnStart, columnEnd);
+          const range = {
+            sheet,
+            row,
+            column,
+            width: Math.abs(columnEnd - columnStart) + 1,
+            height: Math.abs(rowEnd - rowStart) + 1,
+          };
+          model.pasteCsvText(range, value);
+          setRedrawId((id) => id + 1);
+        } else {
+          // NOT IMPLEMENTED
+        }
+        event.preventDefault();
+        event.stopPropagation();
+      }}
+      onCopy={(event: React.ClipboardEvent) => {
+        const data = model.copyToClipboard();
+        // '2024-10-18T14:07:37.599Z'
+
+        let clipboardId = sessionStorage.getItem(
+          CLIPBOARD_ID_SESSION_STORAGE_KEY,
+        );
+        if (!clipboardId) {
+          clipboardId = getNewClipboardId();
+          sessionStorage.setItem(CLIPBOARD_ID_SESSION_STORAGE_KEY, clipboardId);
+        }
+        const sheetData: {
+          [row: number]: {
+            [column: number]: ClipboardCell;
+          };
+        } = {};
+        data.data.forEach((value, row) => {
+          const rowData: {
+            [column: number]: ClipboardCell;
+          } = {};
+          value.forEach((val, column) => {
+            rowData[column] = val;
+          });
+          sheetData[row] = rowData;
+        });
+        const clipboardJsonStr = JSON.stringify({
+          type: "copy",
+          area: data.range,
+          sheetData,
+          clipboardId,
+        });
+        event.clipboardData.setData("text/plain", data.csv);
+        event.clipboardData.setData("application/json", clipboardJsonStr);
+        event.preventDefault();
+        event.stopPropagation();
+      }}
+      onCut={(event: React.ClipboardEvent) => {
+        const data = model.copyToClipboard();
+        // '2024-10-18T14:07:37.599Z'
+
+        let clipboardId = sessionStorage.getItem(
+          CLIPBOARD_ID_SESSION_STORAGE_KEY,
+        );
+        if (!clipboardId) {
+          clipboardId = getNewClipboardId();
+          sessionStorage.setItem(CLIPBOARD_ID_SESSION_STORAGE_KEY, clipboardId);
+        }
+        const sheetData: {
+          [row: number]: {
+            [column: number]: ClipboardCell;
+          };
+        } = {};
+        data.data.forEach((value, row) => {
+          const rowData: {
+            [column: number]: ClipboardCell;
+          } = {};
+          value.forEach((val, column) => {
+            rowData[column] = val;
+          });
+          sheetData[row] = rowData;
+        });
+        const clipboardJsonStr = JSON.stringify({
+          type: "cut",
+          area: data.range,
+          sheetData,
+          clipboardId,
+        });
+        event.clipboardData.setData("text/plain", data.csv);
+        event.clipboardData.setData("application/json", clipboardJsonStr);
+        workbookState.setCutRange({
+          sheet: model.getSelectedSheet(),
+          rowStart: data.range[0],
+          rowEnd: data.range[2],
+          columnStart: data.range[1],
+          columnEnd: data.range[3],
+        });
+        event.preventDefault();
+        event.stopPropagation();
+        setRedrawId((id) => id + 1);
+      }}
+    >
       <Toolbar
         canUndo={model.canUndo()}
         canRedo={model.canRedo()}
@@ -301,22 +539,30 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
         horizontalAlign={
           style.alignment ? style.alignment.horizontal : "general"
         }
-        verticalAlign={style.alignment ? style.alignment.vertical : "center"}
+        verticalAlign={
+          style.alignment?.vertical ? style.alignment.vertical : "bottom"
+        }
         canEdit={true}
         numFmt={style.num_fmt}
-        showGridLines={model.getShowGridLines(sheet)}
+        showGridLines={model.getShowGridLines(model.getSelectedSheet())}
         onToggleShowGridLines={(show) => {
+          const sheet = model.getSelectedSheet();
           model.setShowGridLines(sheet, show);
           setRedrawId((id) => id + 1);
         }}
       />
       <FormulaBar
-        cellAddress={cellAddress}
+        cellAddress={cellAddress()}
-        formulaValue={formulaValue}
+        formulaValue={formulaValue()}
-        onChange={(value) => {
+        onChange={() => {
-          model.setUserInput(sheet, row, column, value);
+          setRedrawId((id) => id + 1);
+          focusWorkbook();
+        }}
+        onTextUpdated={() => {
           setRedrawId((id) => id + 1);
         }}
+        model={model}
+        workbookState={workbookState}
       />
       <Worksheet
         model={model}
@@ -325,9 +571,11 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
           setRedrawId((id) => id + 1);
         }}
       />
+
       <Navigation
         sheets={info}
         selectedIndex={model.getSelectedSheet()}
+        workbookState={workbookState}
         onSheetSelected={(sheet: number): void => {
           model.setSelectedSheet(sheet);
           setRedrawId((value) => value + 1);
@@ -368,6 +616,7 @@ const Container = styled("div")`
   display: flex;
   flex-direction: column;
   height: 100%;
+  position: relative;
   font-family: ${({ theme }) => theme.typography.fontFamily};
 
   &:focus {

webapp/src/components/workbookState.ts

@@ -1,5 +1,28 @@
+// This are properties of the workbook that are not permanently stored
+// They only happen at 'runtime' while the workbook is being used:
+//
+// * What are we editing
+// * Are we copying styles?
+// * Are we extending a cell? (by pulling the cell outline handle down, for instance)
+//
+// Editing the cell is the most complex operation.
+//
+// * What cell are we editing?
+// * Are we doing that from the cell editor or the formula editor?
+// * What is the text content of the cell right now
+// * The active ranges can technically be computed from the text.
+//   Those are the ranges or cells that appear in the formula
+
 import type { CellStyle } from "@ironcalc/wasm";
 
+export interface CutRange {
+  sheet: number;
+  rowStart: number;
+  rowEnd: number;
+  columnStart: number;
+  columnEnd: number;
+}
+
 export enum AreaType {
   rowsDown = 0,
   columnsRight = 1,
@@ -15,15 +38,67 @@ export interface Area {
   columnEnd: number;
 }
 
+// Active ranges are ranges in the sheet that are highlighted when editing a formula
+export interface ActiveRange {
+  sheet: number;
+  rowStart: number;
+  rowEnd: number;
+  columnStart: number;
+  columnEnd: number;
+  color: string;
+}
+
+export interface ReferencedRange {
+  range: {
+    sheet: number;
+    rowStart: number;
+    rowEnd: number;
+    columnStart: number;
+    columnEnd: number;
+  };
+  str: string;
+}
+
+type Focus = "cell" | "formula-bar";
+type EditorMode = "accept" | "edit";
+
+// In "edit" mode arrow keys will move you around the text in the editor
+// In "accept" mode arrow keys will accept the content and move to the next cell or select another cell
+
+// The cell that we are editing
+export interface EditingCell {
+  sheet: number;
+  row: number;
+  column: number;
+  // raw text in the editor
+  text: string;
+  // position of the cursor
+  cursorStart: number;
+  cursorEnd: number;
+  // referenced range
+  referencedRange: ReferencedRange | null;
+  focus: Focus;
+  activeRanges: ActiveRange[];
+  mode: EditorMode;
+  editorWidth: number;
+  editorHeight: number;
+}
+
+// Those are styles that are copied
 type AreaStyles = CellStyle[][];
 
 export class WorkbookState {
   private extendToArea: Area | null;
   private copyStyles: AreaStyles | null;
+  private cell: EditingCell | null;
+  private cutRange: CutRange | null;
 
   constructor() {
+    // the extendTo area is the area we are covering
     this.extendToArea = null;
     this.copyStyles = null;
+    this.cell = null;
+    this.cutRange = null;
   }
 
   getExtendToArea(): Area | null {
@@ -45,4 +120,61 @@ export class WorkbookState {
   getCopyStyles(): AreaStyles | null {
     return this.copyStyles;
   }
+
+  setActiveRanges(activeRanges: ActiveRange[]) {
+    if (!this.cell) {
+      return;
+    }
+    this.cell.activeRanges = activeRanges;
+  }
+
+  getActiveRanges(): ActiveRange[] {
+    return this.cell?.activeRanges || [];
+  }
+
+  getEditingCell(): EditingCell | null {
+    return this.cell;
+  }
+
+  setEditingCell(cell: EditingCell) {
+    this.cell = cell;
+  }
+
+  clearEditingCell() {
+    this.cell = null;
+  }
+
+  isCellEditorActive(): boolean {
+    if (this.cell) {
+      return this.cell.focus === "cell";
+    }
+    return false;
+  }
+
+  isFormulaEditorActive(): boolean {
+    if (this.cell) {
+      return this.cell.focus === "formula-bar";
+    }
+    return false;
+  }
+
+  getEditingText(): string {
+    const cell = this.cell;
+    if (cell) {
+      return cell.text + (cell.referencedRange?.str || "");
+    }
+    return "";
+  }
+
+  setCutRange(range: CutRange): void {
+    this.cutRange = range;
+  }
+
+  clearCutRange(): void {
+    this.cutRange = null;
+  }
+
+  getCutRange(): CutRange | null {
+    return this.cutRange;
+  }
 }

webapp/src/components/worksheet.tsx

@@ -2,10 +2,18 @@ import type { Model } from "@ironcalc/wasm";
 import { styled } from "@mui/material/styles";
 import { useEffect, useLayoutEffect, useRef, useState } from "react";
 import {
+  COLUMN_WIDTH_SCALE,
+  ROW_HEIGH_SCALE,
   outlineBackgroundColor,
   outlineColor,
 } from "./WorksheetCanvas/constants";
 import WorksheetCanvas from "./WorksheetCanvas/worksheetCanvas";
+import {
+  FORMULA_BAR_HEIGH,
+  NAVIGATION_HEIGH,
+  TOOLBAR_HEIGH,
+} from "./constants";
+import Editor from "./editor/editor";
 import type { Cell } from "./types";
 import usePointer from "./usePointer";
 import { AreaType, type WorkbookState } from "./workbookState";
@@ -32,7 +40,8 @@ function Worksheet(props: {
 
   const worksheetElement = useRef<HTMLDivElement>(null);
   const scrollElement = useRef<HTMLDivElement>(null);
-  // const rootElement = useRef<HTMLDivElement>(null);
+
+  const editorElement = useRef<HTMLDivElement>(null);
   const spacerElement = useRef<HTMLDivElement>(null);
   const cellOutline = useRef<HTMLDivElement>(null);
   const areaOutline = useRef<HTMLDivElement>(null);
@@ -47,6 +56,7 @@ function Worksheet(props: {
 
   const { model, workbookState, refresh } = props;
   const [clientWidth, clientHeight] = useWindowSize();
+
   useEffect(() => {
     const canvasRef = canvasElement.current;
     const columnGuideRef = columnResizeGuide.current;
@@ -58,6 +68,7 @@ function Worksheet(props: {
     const handle = cellOutlineHandle.current;
     const area = areaOutline.current;
     const extendTo = extendToOutline.current;
+    const editor = editorElement.current;
 
     if (
       !canvasRef ||
@@ -69,11 +80,13 @@ function Worksheet(props: {
       !handle ||
       !area ||
       !extendTo ||
-      !scrollElement.current
+      !scrollElement.current ||
+      !editor
     )
       return;
+    // FIXME: This two need to be computed.
     model.setWindowWidth(clientWidth - 37);
-    model.setWindowHeight(clientHeight - 149);
+    model.setWindowHeight(clientHeight - 190);
     const canvas = new WorksheetCanvas({
       width: worksheetRef.clientWidth,
       height: worksheetRef.clientHeight,
@@ -88,6 +101,7 @@ function Worksheet(props: {
         cellOutlineHandle: handle,
         areaOutline: area,
         extendToOutline: extendTo,
+        editor: editor,
       },
       onColumnWidthChanges(sheet, column, width) {
         model.setColumnWidth(sheet, column, width);
@@ -100,7 +114,7 @@ function Worksheet(props: {
     });
     const scrollX = model.getScrollX();
     const scrollY = model.getScrollY();
-    const [sheetWidth, sheetHeight] = [scrollX + 100_000, scrollY + 500_000]; //canvas.getSheetDimensions();
+    const [sheetWidth, sheetHeight] = [scrollX + 100_000, scrollY + 500_000];
     if (spacerElement.current) {
       spacerElement.current.style.height = `${sheetHeight}px`;
       spacerElement.current.style.width = `${sheetWidth}px`;
@@ -127,10 +141,6 @@ function Worksheet(props: {
     worksheetCanvas.current = canvas;
   });
 
-  const sheetNames = model
-    .getWorksheetsProperties()
-    .map((s: { name: string }) => s.name);
-
   const {
     onPointerMove,
     onPointerDown,
@@ -138,6 +148,9 @@ function Worksheet(props: {
     onPointerUp,
     // onContextMenu,
   } = usePointer({
+    model,
+    workbookState,
+    refresh,
     onCellSelected: (cell: Cell, event: React.MouseEvent) => {
       event.preventDefault();
       event.stopPropagation();
@@ -152,6 +165,7 @@ function Worksheet(props: {
       const { row, column } = cell;
       model.onAreaSelecting(row, column);
       canvas.renderSheet();
+      refresh();
     },
     onAreaSelected: () => {
       const styles = workbookState.getCopyStyles();
@@ -167,6 +181,7 @@ function Worksheet(props: {
       if (worksheetElement.current) {
         worksheetElement.current.style.cursor = "auto";
       }
+      refresh();
     },
     onExtendToCell: (cell) => {
       const canvas = worksheetCanvas.current;
@@ -281,6 +296,12 @@ function Worksheet(props: {
           break;
         }
       }
+      model.setSelectedRange(
+        Math.min(rowStart, extendedArea.rowStart),
+        Math.min(columnStart, extendedArea.columnStart),
+        Math.max(rowStart + height - 1, extendedArea.rowEnd),
+        Math.max(columnStart + width - 1, extendedArea.columnEnd),
+      );
       workbookState.clearExtendToArea();
       canvas.renderSheet();
     },
@@ -310,21 +331,51 @@ function Worksheet(props: {
       <SheetContainer
         className="sheet-container"
         ref={worksheetElement}
-        onPointerDown={(event) => {
+        onPointerDown={onPointerDown}
-          onPointerDown(event);
-        }}
         onPointerMove={onPointerMove}
         onPointerUp={onPointerUp}
         onDoubleClick={(event) => {
+          // Starts editing cell
           const { sheet, row, column } = model.getSelectedView();
-          const _text = model.getCellContent(sheet, row, column) || "";
+          const text = model.getCellContent(sheet, row, column);
-          // TODO
+          const editorWidth =
+            model.getColumnWidth(sheet, column) * COLUMN_WIDTH_SCALE;
+          const editorHeight = model.getRowHeight(sheet, row) * ROW_HEIGH_SCALE;
+          workbookState.setEditingCell({
+            sheet,
+            row,
+            column,
+            text,
+            cursorStart: text.length,
+            cursorEnd: text.length,
+            focus: "cell",
+            referencedRange: null,
+            activeRanges: [],
+            mode: "accept",
+            editorWidth,
+            editorHeight,
+          });
           event.stopPropagation();
-          event.preventDefault();
+          // event.preventDefault();
+          props.refresh();
         }}
       >
         <SheetCanvas ref={canvasElement} />
         <CellOutline ref={cellOutline} />
+        <EditorWrapper ref={editorElement}>
+          <Editor
+            originalText={workbookState.getEditingText()}
+            onEditEnd={(): void => {
+              props.refresh();
+            }}
+            onTextUpdated={(): void => {
+              props.refresh();
+            }}
+            model={model}
+            workbookState={workbookState}
+            type={"cell"}
+          />
+        </EditorWrapper>
         <AreaOutline ref={areaOutline} />
         <ExtendToOutline ref={extendToOutline} />
         <CellOutlineHandle
@@ -382,10 +433,11 @@ const SheetContainer = styled("div")`
 const Wrapper = styled("div")({
   position: "absolute",
   overflow: "scroll",
-  top: 71,
+  top: TOOLBAR_HEIGH + FORMULA_BAR_HEIGH + 1,
   left: 0,
   right: 0,
-  bottom: 41,
+  bottom: NAVIGATION_HEIGH + 1,
+  overscrollBehavior: "none",
 });
 
 const SheetCanvas = styled("canvas")`
@@ -451,7 +503,6 @@ const CellOutlineHandle = styled("div")`
   height: 5px;
   background: ${outlineColor};
   cursor: crosshair;
-  // border: 1px solid white;
   border-radius: 1px;
 `;
 
@@ -461,4 +512,22 @@ const ExtendToOutline = styled("div")`
   border-radius: 3px;
 `;
 
+const EditorWrapper = styled("div")`
+  position: absolute;
+  width: 100%;
+  padding: 0px;
+  border-width: 0px;
+  outline: none;
+  resize: none;
+  white-space: pre-wrap;
+  vertical-align: bottom;
+  overflow: hidden;
+  text-align: left;
+  span {
+    min-width: 1px;
+  }
+  font-family: monospace;
+  border: 2px solid ${outlineColor};
+`;
+
 export default Worksheet;

webapp/src/icons/border-style.svg

@@ -1,15 +1,7 @@
 <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<!-- <path d="M14 4H2" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<line x1="0" y1="2" x2="16" y2="2" stroke="#000"/>
-<path d="M14 8H2" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-dasharray="2 2"/>
-<path d="M14 12H2" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-dasharray="0.01 2"/> -->
-<style>
-    line {
-      stroke: black;
-    }
-  </style>
-<line x1="0" y1="2" x2="16" y2="2" />
   <!-- Dashes and gaps of the same size -->
-<line x1="0" y1="8" x2="16" y2="8" stroke-dasharray="2.28 2.28" />
+<line x1="0" y1="8" x2="16" y2="8" stroke-dasharray="2.28 2.28" stroke="#000"/>
   <!-- Dashes and gaps of different sizes -->
-<line x1="0" y1="14" x2="16" y2="14" stroke-dasharray="1 2" />
+<line x1="0" y1="14" x2="16" y2="14" stroke-dasharray="1 2" stroke="#000"/>
 </svg>

webapp/src/icons/index.ts

@@ -20,6 +20,9 @@ import InsertColumnRightIcon from "./insert-column-right.svg?react";
 import InsertRowAboveIcon from "./insert-row-above.svg?react";
 import InsertRowBelow from "./insert-row-below.svg?react";
 
+import IronCalcIcon from "./ironcalc_icon.svg?react";
+import IronCalcLogo from "./orange+black.svg?react";
+
 import Fx from "./fx.svg?react";
 
 export {
@@ -42,5 +45,7 @@ export {
   InsertColumnRightIcon,
   InsertRowAboveIcon,
   InsertRowBelow,
+  IronCalcIcon,
+  IronCalcLogo,
   Fx,
 };

webapp/src/icons/ironcalc_icon.svg

@@ -0,0 +1,7 @@
+<svg width="100" height="100" viewBox="0 0 100 100" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path opacity="0.8" fill-rule="evenodd" clip-rule="evenodd" d="M62.2449 0C62.2449 16.5084 55.687 32.3406 44.0138 44.0138C42.0408 45.9868 39.949 47.8137 37.7551 49.4875L37.7551 100C37.7551 83.4916 44.3131 67.6594 55.9863 55.9862C57.9593 54.0132 60.0511 52.1863 62.2449 50.5125L62.2449 0Z" fill="#F2994A"/>
+<path opacity="0.8" fill-rule="evenodd" clip-rule="evenodd" d="M37.7552 0.0239258C37.7488 10.0285 33.7717 19.622 26.697 26.6968C19.6165 33.7773 10.0133 37.755 6.10352e-05 37.755V62.2448C13.7182 62.2448 26.9694 57.7164 37.7552 49.4874V0.0239258Z" fill="#F2994A"/>
+<path opacity="0.8" fill-rule="evenodd" clip-rule="evenodd" d="M62.2449 99.976C62.2513 89.9713 66.2283 80.3779 73.3031 73.3031C80.3836 66.2226 89.9868 62.2449 100 62.2449V37.7551C86.2819 37.7551 73.0307 42.2835 62.2449 50.5125V99.976Z" fill="#F2994A"/>
+<path fill-rule="evenodd" clip-rule="evenodd" d="M44.0138 44.0138C55.687 32.3406 62.2449 16.5084 62.2449 0H37.7551V49.4875C39.949 47.8137 42.0408 45.9868 44.0138 44.0138Z" fill="#F2994A"/>
+<path fill-rule="evenodd" clip-rule="evenodd" d="M37.7551 99.9655C37.7551 99.977 37.7551 99.9885 37.7551 100H62.2449C62.2449 99.9912 62.2449 99.9825 62.2449 99.9737V50.5125C60.0511 52.1863 57.9593 54.0132 55.9862 55.9862C44.3212 67.6513 37.7643 83.4696 37.7551 99.9655Z" fill="#F2994A"/>
+</svg>

webapp/src/index.css

@@ -1,4 +1,5 @@
 body {
+  inset: 0px;
   margin: 0;
   padding: 0;
 }

webapp/src/locale/en_us.json

@@ -15,15 +15,18 @@
     "format_number": "Format number",
     "font_color": "Font color",
     "fill_color": "Fill color",
-    "borders": "Borders",
     "decimal_places_increase": "Increase decimal places",
     "decimal_places_decrease": "Decrease decimal places",
+    "show_hide_grid_lines": "Show/hide grid lines",
+    "vertical_align_bottom": "Align bottom",
+    "vertical_align_middle": " Align middle",
+    "vertical_align_top": "Align top",
     "format_menu": {
       "auto": "Auto",
       "number": "Number",
       "percentage": "Percentage",
       "currency_eur": "Euro (EUR)",
-      "currency_usd": "Dollar (USD",
+      "currency_usd": "Dollar (USD)",
       "currency_gbp": "British Pound (GBD)",
       "date_short": "Short date",
       "date_long": "Long date",
@@ -35,6 +38,21 @@
       "currency_gbp_example": "£",
       "date_short_example": "09/24/2024",
       "date_long_example": "Tuesday, September 24, 2024"
+    },
+    "borders": {
+      "title": "Borders",
+      "all": "All borders",
+      "inner": "Inner borders",
+      "outer": "Outer borders",
+      "top": "Top borders",
+      "bottom": "Bottom borders",
+      "clear": "Clear borders",
+      "left": "Left borders",
+      "right": "Right borders",
+      "horizontal": "Horizontal borders",
+      "vertical": "Vertical borders",
+      "color": "Border color",
+      "style": "Border style"
     }
   },
   "num_fmt": {
@@ -51,5 +69,9 @@
     "update": "Update",
     "label": "Formula",
     "title": "Update formula"
+  },
+  "navigation": {
+    "add_sheet": "Add sheet",
+    "sheet_list": "Sheet list"
   }
 }

webapp/src/main.tsx

@@ -1,8 +1,8 @@
-import React from "react";
 import ReactDOM from "react-dom/client";
 import App from "./App.tsx";
 import "./index.css";
 import ThemeProvider from "@mui/material/styles/ThemeProvider";
+import React from "react";
 import { theme } from "./theme.ts";
 
 // biome-ignore lint: we know the 'root' element exists.