Mega Code Archive
Draw Bitmaps in a TListbox
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Title: draw Bitmaps in a TListbox?
{ Create a TImage on your Formular and assign a bitmap }
{ Create a TListbox on your Formular }
type
TForm1 = class(TForm)
ListBox1: TListBox;
Image1: TImage;
procedure FormCreate(Sender: TObject);
procedure ListBox1DrawItem(Control: TWinControl; Index: Integer;
Rect: TRect; State: TOwnerDrawState);
procedure ListBox1MeasureItem(Control: TWinControl; Index: Integer;
var Height: Integer);
private
{...}
public
{...}
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
with ListBox1.Items do
begin
Clear;
ListBox1.Style := lbOwnerDrawVariable;
AddObject('Bitmap1', Image1.Picture.Bitmap);
AddObject('Bitmap2', Image2.Picture.Bitmap);
AddObject('Bitmap3', Image3.Picture.Bitmap);
end;
end;
procedure CenterText(Cnv: TCanvas; Rect: TRect; S: string);
var
X, Y: Integer;
begin
X := (Rect.Right + Rect.Left - Cnv.TextWidth(S)) div 2;
Y := (Rect.Bottom + Rect.Top - Cnv.TextHeight(S)) div 2;
Cnv.TextOut(X, Y, S);
end;
procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer;
Rect: TRect; State: TOwnerDrawState);
var
Bitmap: TBitmap;
begin
with ListBox1 do
begin
Canvas.FillRect(Rect);
if Items.Objects[Index] nil then
begin
Bitmap := Items.Objects[Index] as TBitmap;
Canvas.BrushCopy(Bounds(Rect.Left + 2, Rect.Top + 2,
Bitmap.Width, Bitmap.Height), Bitmap, Bounds(0, 0, Bitmap.Width,
Bitmap.Height), Bitmap.Canvas.Pixels[0, Bitmap.Height - 1]);
end;
Rect.Left := Rect.Left + Bitmap.Width + 4;
Rect.Bottom := Rect.Top + Bitmap.Height + 4;
CenterText(Canvas, Rect, Items.Strings[Index]);
end;
end;
procedure TForm1.ListBox1MeasureItem(Control: TWinControl; Index: Integer;
var Height: Integer);
begin
if Index = 0 then Height := Image1.Height + 4;
end;
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