fpspreadsheet: New behavior of DEL in WorksheetGrid: deletes only content, not format. Old behavior (delete everything) is CTRL+DEL now.

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@6605 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/fpspreadsheet/source/common/fpspreadsheet.pas

@@ -398,7 +398,7 @@ type
 
     procedure Clear;
     procedure DeleteCell(ACell: PCell);
-    procedure EraseCell(ACell: PCell);
+    procedure EraseCell(ACell: PCell; AKeepFormat: Boolean = false);
 
     function  AddCell(ARow, ACol: Cardinal): PCell;
     function  FindCell(ARow, ACol: Cardinal): PCell; overload;
@@ -483,6 +483,7 @@ type
     procedure SelectCell(ARow, ACol: Cardinal);
     procedure ClearSelection;
     procedure DeleteSelection;
+    procedure EraseSelection(AKeepFormat: Boolean = false);
     function GetSelection: TsCellRangeArray;
     function GetSelectionAsString: String;
     function GetSelectionCount: Integer;
@@ -2212,7 +2213,7 @@ end;
 
   @param  ACell  Pointer to cell to be erased.
 -------------------------------------------------------------------------------}
-procedure TsWorksheet.EraseCell(ACell: PCell);
+procedure TsWorksheet.EraseCell(ACell: PCell; AKeepFormat: Boolean = false);
 var
   r, c: Cardinal;
 begin
@@ -2233,8 +2234,11 @@ begin
     // Removes the formula if the cell has one
     DeleteFormula(ACell);
 
-    // Erase all cell content
-    InitCell(nil, r, c, ACell^);
+    if AKeepFormat then
+      ACell^.ContentType := cctEmpty
+    else
+      // Erase all cell content
+      InitCell(nil, r, c, ACell^);
   end;
 end;
 
@@ -4481,6 +4485,27 @@ begin
   ClearSelection;
 end;
 
+{@@ ----------------------------------------------------------------------------
+  Erases all selected cells (erase = keep cell, but delete content)
+  If AKeepFormat is true the cell format is left unchanged.
+-------------------------------------------------------------------------------}
+procedure TsWorksheet.EraseSelection(AKeepFormat: Boolean = false);
+var
+  i: Integer;
+  r, c: Cardinal;
+  cell: PCell;
+begin
+  for i:=0 to High(FSelection) do
+    for r := FSelection[i].Row1 to FSelection[i].Row2 do
+      for c := FSelection[i].Col1 to FSelection[i].Col2 do
+      begin
+        cell := FindCell(r, c);
+        EraseCell(cell, AKeepFormat);
+      end;
+  ClearSelection;
+end;
+
+
 {@@ ----------------------------------------------------------------------------
   Returns the list of selected cell ranges
 -------------------------------------------------------------------------------}

components/fpspreadsheet/source/visual/fpspreadsheetgrid.pas

@@ -4648,7 +4648,10 @@ begin
     VK_F2:
       FEnhEditMode := true;
     VK_DELETE:
-      Worksheet.DeleteSelection;
+      if (ssCtrl in Shift) then
+        Worksheet.DeleteSelection
+      else
+        Worksheet.EraseSelection(true);
   end;
 
   inherited;