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Frequently Asked Questions

Transparent property to work for a CoolBar background bitmap

Question:

How can I get the transparent property to work for a background bitmap assigned to a CoolBar component?

Answer:

procedure TForm1.Button1Click(Sender: TObject);
var
  Bm1 : TBitmap;
  Bm2 : TBitmap;
begin
  Bm1 := TBitmap.Create;
  Bm2 := TBitmap.Create;
  Bm1.LoadFromFile('c:\download\test.bmp');
  Bm2.Width := Bm1.Width;
  Bm2.Height := Bm1.Height;
  bm2.Canvas.Brush.Color := CoolBar1.Color;
  bm2.Canvas.BrushCopy(Rect(0, 0, bm2.Width, bm2.Height),
                       Bm1,
                       Rect(0, 0, Bm1.width, Bm1.Height),
                       ClWhite);
  bm1.Free;
  CoolBar1.Bitmap.Assign(bm2);
  bm2.Free;
end;

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