UPDATE: Text spills now to adjacent cells if needed

base/src/user_model/common.rs

@@ -13,8 +13,8 @@ use crate::{
     },
     model::Model,
     types::{
-        Alignment, BorderItem, CellType, Col, HorizontalAlignment, SheetProperties, SheetState,
-        Style, VerticalAlignment,
+        Alignment, BorderItem, Cell, CellType, Col, HorizontalAlignment, SheetProperties,
+        SheetState, Style, VerticalAlignment,
     },
     utils::is_valid_hex_color,
 };
@@ -1602,6 +1602,64 @@ impl UserModel {
         Ok(self.model.workbook.worksheet(sheet)?.show_grid_lines)
     }
 
+    /// Returns the largest column in the row less than a column whose cell has a non empty value.
+    /// If the row is empty, it returns `None`.
+    /// This is useful when rendering a part of a worksheet to know which cells spill over
+    pub fn get_last_non_empty_in_row_before_column(
+        &self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+    ) -> Result<Option<i32>, String> {
+        let worksheet = self.model.workbook.worksheet(sheet)?;
+        let data = worksheet.sheet_data.get(&row);
+        if let Some(row_data) = data {
+            let mut last_column = None;
+            let mut columns: Vec<i32> = row_data.keys().copied().collect();
+            columns.sort_unstable();
+            for col in columns {
+                if col < column {
+                    if let Some(cell) = worksheet.cell(row, col) {
+                        if matches!(cell, Cell::EmptyCell { .. }) {
+                            continue;
+                        }
+                    }
+                    last_column = Some(col);
+                }
+            }
+            Ok(last_column)
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Returns the largest column in the row greater than a column whose cell has a non empty value.
+    pub fn get_first_non_empty_in_row_after_column(
+        &self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+    ) -> Result<Option<i32>, String> {
+        let worksheet = self.model.workbook.worksheet(sheet)?;
+        let data = worksheet.sheet_data.get(&row);
+        if let Some(row_data) = data {
+            let mut columns: Vec<i32> = row_data.keys().copied().collect();
+            // We sort the keys to ensure we are going from left to right
+            columns.sort_unstable();
+            for col in columns {
+                if col > column {
+                    if let Some(cell) = worksheet.cell(row, col) {
+                        if matches!(cell, Cell::EmptyCell { .. }) {
+                            continue;
+                        }
+                    }
+                    return Ok(Some(col));
+                }
+            }
+        }
+        Ok(None)
+    }
+
     /// Returns a copy of the selected area
     pub fn copy_to_clipboard(&self) -> Result<Clipboard, String> {
         let selected_area = self.get_selected_view();