Am Dienstag, den 03.01.2006, 00:04 +0100 schrieb Marc Santhoff:
> Am Montag, den 02.01.2006, 22:58 +0100 schrieb dannym:
> > Hi,
> >
> > Am Montag, den 02.01.2006, 22:18 +0100 schrieb Marc Santhoff:
> > > Hi,
> > >
> > > I'm setting the 'color' property of a TPanel and it is getting pretty
> > > green. If set back to 'clBtnFace' nothing happens.
> > >
> > > procedure TKeyboardForm.rgTestTypeClick(Sender: TObject);
> > > begin
> > >
> > > if (TRadioGroup(Sender).itemindex = 1) then begin
> > > ...
> > > lbSignal.Caption := 'Bitte *jede* Taste einmal drücken!';
> > > pnKeyboard.Color := clGreen;
> > > pnKeyboard.refresh;
> > > (* This does work, the panel is getting green. *)
> > > end;
> > > end;
> > > end;
> > >
> > > procedure TKeyboardForm.bbStopClick(Sender: TObject);
> > > begin
> > > ...
> > > lbSignal.Caption := 'Abgebrochen.';
> > > pnKeyboard.Color := clBtnFace;
> > > pnKeyboard.invalidate;
> > > pnKeyboard.paint;
> > > (* Here nothing happens on the panel, it stays green. *)
> > > ...
> > > end;
> > > end;
> > >
> > > The caption of the label is set correctly in both cases. Instead of
> > > 'paint' I tried several combinations of 'refresh', 'redraw' and
> > > 'invalidate', with no positive result.
> > >
> > > I remember something around colors and paint, so it may be a faq ...
> >
> > Probably a bug..
>
> Seems to be, but maybe WindowMaker or something else is mixing things up
> here.
>
> I tried other components and invalidated the form and they behave
> different:
>
> TButton: gets green, stays green but the highlight color is shown when
> the mouse is over it
>
> TLabel: is getting green and grey again, works as expected.
>
> The label is positioned on the same form as the panel, but the button is
> sitting on the green panel. If it is not but on the form the behaviour
> does not change.
>
> > Which platform?
>
> FreeBSD 4.11, fpc-2.0.2, Lazarus SVN 8285M (0.9.11 beta)
I've poked around in the sources but I found nothing (sure because of
missing knowledge and understanding of lazarus internals), but:
Redraw problems are subject to controls derived from TWinControl, TLabel
is a TGraphicControl and has no problem.
All this holds true for GTK1 and there are at least two bug reports
related (1134 and 1160, some others deal with similar problems).
Can anyone comment on this, maybe suggest a strategy for hunting this
bug?
TIA,
Marc
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