UPDATE: Add clear formatting

Fixes #267

base/src/test/user_model/test_styles.rs

@@ -436,3 +436,47 @@ fn false_removes_value() {
     let style = model.get_cell_style(0, 1, 1).unwrap();
     assert!(!style.font.b);
 }
+
+#[test]
+fn cell_clear_formatting() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    let range = Area {
+        sheet: 0,
+        row: 1,
+        column: 1,
+        width: 1,
+        height: 1,
+    };
+
+    // bold
+    model.update_range_style(&range, "font.b", "true").unwrap();
+    model
+        .update_range_style(&range, "alignment.horizontal", "centerContinuous")
+        .unwrap();
+
+    let style = model.get_cell_style(0, 1, 1).unwrap();
+    assert!(style.font.b);
+    assert_eq!(
+        style.alignment.unwrap().horizontal,
+        HorizontalAlignment::CenterContinuous
+    );
+
+    model.range_clear_all(&range).unwrap();
+    let style = model.get_cell_style(0, 1, 1).unwrap();
+    assert!(!style.font.b);
+    assert_eq!(style.alignment, None);
+
+    model.undo().unwrap();
+
+    let style = model.get_cell_style(0, 1, 1).unwrap();
+    assert!(style.font.b);
+    assert_eq!(
+        style.alignment.unwrap().horizontal,
+        HorizontalAlignment::CenterContinuous
+    );
+    model.redo().unwrap();
+
+    let style = model.get_cell_style(0, 1, 1).unwrap();
+    assert!(!style.font.b);
+    assert_eq!(style.alignment, None);
+}

base/src/user_model/common.rs

@@ -566,6 +566,34 @@ impl UserModel {
         Ok(())
     }
 
+    /// Removes cells styles and formatting, but keeps the content
+    ///
+    /// See also:
+    /// * [UserModel::range_clear_all]
+    /// * [UserModel::range_clear_contents]
+    pub fn range_clear_formatting(&mut self, range: &Area) -> Result<(), String> {
+        let sheet = range.sheet;
+        let mut diff_list = Vec::new();
+        for row in range.row..range.row + range.height {
+            for column in range.column..range.column + range.width {
+                let old_style = self.model.get_style_for_cell(sheet, row, column)?;
+                // We can always assume that style with style_index 0 exists and it is the default
+                self.model
+                    .workbook
+                    .worksheet_mut(sheet)?
+                    .set_cell_style(row, column, 0)?;
+                diff_list.push(Diff::CellClearFormatting {
+                    sheet,
+                    row,
+                    column,
+                    old_style: Box::new(old_style),
+                });
+            }
+        }
+        self.push_diff_list(diff_list);
+        Ok(())
+    }
+
     /// Inserts a row
     ///
     /// See also:
@@ -2006,6 +2034,15 @@ impl UserModel {
                     old_value,
                     new_value: _,
                 } => self.model.set_sheet_state(*index, old_value.clone())?,
+                Diff::CellClearFormatting {
+                    sheet,
+                    row,
+                    column,
+                    old_style,
+                } => {
+                    self.model
+                        .set_cell_style(*sheet, *row, *column, old_style)?;
+                }
             }
         }
         if needs_evaluation {
@@ -2160,6 +2197,17 @@ impl UserModel {
                     old_value: _,
                     new_value,
                 } => self.model.set_sheet_state(*index, new_value.clone())?,
+                Diff::CellClearFormatting {
+                    sheet,
+                    row,
+                    column,
+                    old_style: _,
+                } => {
+                    self.model
+                        .workbook
+                        .worksheet_mut(*sheet)?
+                        .set_cell_style(*row, *column, 0)?;
+                }
             }
         }
 

base/src/user_model/history.rs

@@ -39,6 +39,12 @@ pub(crate) enum Diff {
         old_value: Box<Option<Cell>>,
         old_style: Box<Style>,
     },
+    CellClearFormatting {
+        sheet: u32,
+        row: i32,
+        column: i32,
+        old_style: Box<Style>,
+    },
     SetCellStyle {
         sheet: u32,
         row: i32,