Menambah CheckBox Pada DBGrid

Menambah CheckBox Pada DBGrid

type
TForm1 = class(TForm)
DBGrid1: TDBGrid;
procedure DBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect;
DataCol: Integer; Column: TColumn; State: TGridDrawState);
procedure DBGrid1CellClick(Column: TColumn);
procedure DBGrid1ColEnter(Sender: TObject);
procedure DBGrid1ColExit(Sender: TObject);
procedure SaveBoolean;
private
{ Private declarations }
FOriginalOptions : TDBGridOptions;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}


procedure TForm1.SaveBoolean;
begin
DBGrid1.SelectedField.Dataset.Edit;
DBGrid1.SelectedField.AsBoolean := not Self.DBGrid1.SelectedField.AsBoolean;
end;

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);
var
CheckBoxRectangle : TRect;
begin
if Column.Field.DataType = ftBoolean then
begin
DBGrid1.Canvas.FillRect(Rect);
CheckBoxRectangle.Left := Rect.Left + 2;
CheckBoxRectangle.Right := Rect.Right – 2;
CheckBoxRectangle.Top := Rect.Top + 2;
CheckBoxRectangle.Bottom := Rect.Bottom – 2;
DrawFrameControl(DBGrid1.Canvas.Handle,
CheckBoxRectangle,
DFC_BUTTON,
CtrlState[Column.Field.AsBoolean]);
end;
end;

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

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

procedure TForm1.DBGrid1CellClick(Column: TColumn);
begin
if DBGrid1.SelectedField.DataType = ftBoolean then
SaveBoolean();
end;