[Lazarus] Calling DrawFocusRect() outside the Paint() event
nc-gaertnma at netcologne.de
Mon Oct 10 12:11:37 CEST 2016
On Mon, 10 Oct 2016 12:05:41 +0200 (CEST)
Michael Van Canneyt via Lazarus <lazarus at 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
> - 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 ?
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