InvalidateRect ???
lazarus / 12-Debugger

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userx-bw · 2014-01-22 23:18

I have a GroupBox with an TImage inside of it to show a picture from a
file using OpenPictureDialog

what does this mean and how do I fix it?

QuoteWARNING: TGtk2WidgetSet.InvalidateRect refused invalidating
during paint message: TGroupBox
Linux
Lazarus 1.0.14
FPC 2.6.2

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Martin_fr · 2014-01-23 02:57

Do you have any OnPaint event?
If so does it contain any call to Invalidate...?

If not:
- Can you test with 1.2RC2 ? Though there is another issue with
Groupbox in 1.2 that it does not fully repaint.

Can you produce a minimum unit, that reproduces it?

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Normally the following rules exist (enforced by many OS)
- paint only in OnPaint
- Invalidate only outside of OnPaint (since OnPaint does actually
validate the last invalidated area.

Something is breaking the 2nd rule.

And yes, those rules are not always enforced. The LCL tries to
workaround them, if you try to paint outside of OnPaint.... but here
apparently it can not.

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zeljko · 2014-01-23 09:22

I've inserted that warning there since invalidating inside paint event
does not have any sense.Warning just shows that something is wrong in
user code or in lcl code (by lcl I mean gtk2lcl which puts paint
events in internal queue and then process it in
TGtk2WidgetSet.ProcessMessages), and of course it refuses to send new
Invalidate to already painted region.
Painting outside of paint event is allowed under gtk2 and this warning
have nothing to do with it.

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userx-bw · 2014-01-29 15:46

Quote from: zeljko on January 23, 2014, 10:22:01 amI've inserted that
warning there since invalidating inside paint event does not have any
sense.Warning just shows that something is wrong in user code or in
lcl code (by lcl I mean gtk2lcl which puts paint events in internal
queue and then process it in TGtk2WidgetSet.ProcessMessages), and of
course it refuses to send new Invalidate to already painted region.
Painting outside of paint event is allowed under gtk2 and this warning
have nothing to do with it.

thanks, it had to do with the transparent setting I had set it set to
true in the properties I changed it back to false and it fixed it. it
is inside a group box.