On Mon, 10 Oct 2016 12:05:41 +0200 (CEST) Michael Van Canneyt via Lazarus <lazarus@lists.lazarus-ide.org> wrote:
>[...] > > If you want to optimize for mini changes like the focusrect you might > > want to use a bitmap. > > Please explain ? Draw to a bitmap and in OnPaint draw that. Similar to a TImage. Then you can also use aggpas. >[...] > So, if I understand you correctly, when I want to draw a focus rect, I must > (roughly): > - calculate the focusrect, > - Call canvas.invalidaterect() with the focusrect > - in the paint event, check ClipRect (which should equal the focusrect) > - and redraw anything that intersects with the cliprect ? > > Correct ? Correct. Mattias -- _______________________________________________ Lazarus mailing list Lazarus@lists.lazarus-ide.org http://lists.lazarus-ide.org/listinfo/lazarus
