Clear canvas and set transparent

[lainz]

See the attached picture / Attached 7z file (requires BGRABitmap as installed package).

Compile and run lazgui_test.

If you go over the 'ToolButton' you will see that is painted.

But if you leave the 'ToolButton' area isn't cleared, and text is drawn over the previous drawing.

I need to clear the previous drawing and only draw text in a transparent area (to see the background gradient).

I tried to use ACanvas.Clear:

(lazguiwin7.pas line 60):

Code: [Select]

if AState = lgNormal then begin
    bmp:= TBGRABitmap.Create(ARect.Right,ARect.Bottom);
    ACanvas.Clear; // This clear the drawing, but isn't transparent, and used in this way produces flickering
end
But the background isn't transparent, it is filled with clDefault.

[eny]

You are 'abusing' the paintboxes and assume that they work like controls.

The easiest fix: repaint all elements of the 'toolbar' when something changes and do it in the right order: first the 'toolbar paintbox' and then all 'button paintboxes'.

BTW: case statement