delphi – DBGrid中的CheckBox

在单元的私有部分中,声明一个全局用于保留网格选项.在输入复选框列时临时禁用文本编辑后,它将用于恢复 – 因为这可能是Jordan Borisovin关于delphi.about.com文章提到的一个小错误

private      
  GridOriginalOptions : TDBGridOptions;

在OnCellClick事件中,如果field是boolean,则切换并将更改发布到数据库

procedure TForm1.DBGrid1CellClick(Column: TColumn);
begin  
  if (Column.Field.DataType=ftBoolean) then
  begin      
    Column.Grid.DataSource.DataSet.Edit;
    Column.Field.Value:= not Column.Field.AsBoolean;
    Column.Grid.DataSource.DataSet.Post;   
  end;
end;

绘制网格的布尔字段的复选框

procedure TForm1.DBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect; 
  DataCol: Integer;      Column: TColumn; State: TGridDrawState);
const
   CtrlState: array[Boolean] of integer = (DFCS_BUTTONCHECK,DFCS_BUTTONCHECK or DFCS_CHECKED) ;
begin
  if (Column.Field.DataType=ftBoolean) then
  begin
    DBGrid1.Canvas.FillRect(Rect) ;
    if (VarIsNull(Column.Field.Value)) then
      DrawFrameControl(DBGrid1.Canvas.Handle,Rect,DFC_BUTTON,DFCS_BUTTONCHECK or DFCS_INACTIVE)
    else
      DrawFrameControl(DBGrid1.Canvas.Handle,CtrlState[Column.Field.AsBoolean]); 
  end;
end;

现在是新的部分,在布尔列中禁用单元格编辑.在OnColEnter和OnColExit事件上：

procedure TForm1.DBGrid1ColEnter(Sender: TObject);
begin
  if Self.DBGrid1.SelectedField.DataType = ftBoolean then
  begin
    Self.GridOriginalOptions := Self.DBGrid1.Options;
    Self.DBGrid1.Options := Self.DBGrid1.Options - [dgEditing];
  end;
end;

procedure TForm1.DBGrid1ColExit(Sender: TObject);
begin
  if Self.DBGrid1.SelectedField.DataType = ftBoolean then
    Self.DBGrid1.Options := Self.GridOriginalOptions;
end;

更重要的是,处理空格键以切换复选框

procedure TForm1.DBGrid1KeyDown(Sender: TObject; var Key: Word;  Shift: TShiftState);
begin
  if ((Self.DBGrid1.SelectedField.DataType = ftBoolean) and (key = VK_SPACE)) then
  begin
    Self.DBGrid1.DataSource.DataSet.Edit;
    Self.DBGrid1.SelectedField.Value:= not Self.DBGrid1.SelectedField.AsBoolean;
    Self.DBGrid1.DataSource.DataSet.Post;   
  end;      
end;

而已！