12
You should draw your own checkboxes, preferably using visual themes, if enabled. This is a simple sketch of how to do that:
const
Checked: array[1..4] of boolean = (false, true, false, true);
procedure TForm4.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
Rect: TRect; State: TGridDrawState);
const
PADDING = 4;
var
h: HTHEME;
s: TSize;
r: TRect;
begin
if (ACol = 2) and (ARow >= 1) then
begin
FillRect(StringGrid1.Canvas.Handle, Rect, GetStockObject(WHITE_BRUSH));
s.cx := GetSystemMetrics(SM_CXMENUCHECK);
s.cy := GetSystemMetrics(SM_CYMENUCHECK);
if UseThemes then
begin
h := OpenThemeData(StringGrid1.Handle, 'BUTTON');
if h <> 0 then
try
GetThemePartSize(h,
StringGrid1.Canvas.Handle,
BP_CHECKBOX,
CBS_CHECKEDNORMAL,
nil,
TS_DRAW,
s);
r.Top := Rect.Top + (Rect.Bottom - Rect.Top - s.cy) div 2;
r.Bottom := r.Top + s.cy;
r.Left := Rect.Left + PADDING;
r.Right := r.Left + s.cx;
DrawThemeBackground(h,
StringGrid1.Canvas.Handle,
BP_CHECKBOX,
IfThen(Checked[ARow], CBS_CHECKEDNORMAL, CBS_UNCHECKEDNORMAL),
r,
nil);
finally
CloseThemeData(h);
end;
end
else
begin
r.Top := Rect.Top + (Rect.Bottom - Rect.Top - s.cy) div 2;
r.Bottom := r.Top + s.cy;
r.Left := Rect.Left + PADDING;
r.Right := r.Left + s.cx;
DrawFrameControl(StringGrid1.Canvas.Handle,
r,
DFC_BUTTON,
IfThen(Checked[ARow], DFCS_CHECKED, DFCS_BUTTONCHECK));
end;
r := Classes.Rect(r.Right + PADDING, Rect.Top, Rect.Right, Rect.Bottom);
DrawText(StringGrid1.Canvas.Handle,
StringGrid1.Cells[ACol, ARow],
length(StringGrid1.Cells[ACol, ARow]),
r,
DT_SINGLELINE or DT_VCENTER or DT_LEFT or DT_END_ELLIPSIS);
end;
end;