[Qt-interest] Best Way To Force Complete Repaint of Widget

[Willy P]

Andre,
Thanks for your continued insight.  It fixed some of the issues.  It
is now not blending w/ junk but w/ a white background as opposed to my
window background.  Again, total refreshes paint perfectly:

Total refresh:
http://dl.getdropbox.com/u/147719/Picture%2014.png

Mouseover repaint:
http://dl.getdropbox.com/u/147719/Picture%2015.png

Any thoughts?



On Tue, Oct 6, 2009 at 1:54 AM, Andre Somers <andre at familiesomers.nl> wrote:
> Willy P wrote:
>> I'm encountering some pretty nasty bugs embedding widgets in OpenGL
>> scenes.  They are not updating properly and there are some bad
>> blending issues with the scene behind it.  However, they work
>> perfectly on total repaint situations, ie when you cover the widget
>> with another window and then show it again.
>>
>> So my question is, how do I force a *total* repaint of the widget and
>> all it's children every time it needs to be updated?  It's not a big
>> widget so I'm not concerned w/ the performance issues.
>>
>> I've tried this, but it only sort of solves my problem:
>>
>>       void MyWidget::paintEvent( QPaintEvent* pe )
>>       {
>>               qDebug() << "painting";
>>
>>               if( pe->rect() != rect() ) {
>>                       pe->accept();
>>                       repaint( rect() );
>>               } else {
>>                       QWidget::paintEvent( pe );
>>               }
>>       }
>>
>> I say sort of, b/c it works if any child widgets are embedded in
>> layouts, they do not get updated.
>>
>> -Willy
>>
>> PS:  This only seems to be a problem on Mac, Windows works fine.
>>
>>
> In that case, why not iterate over the child widgets and force a repaint
> on them too?
> Something like:
>
> QList<QWidget *> widgets = parentWidget.findChildren<QWidget *>();
> foreach (QWidget* w, widgets)
>     w->repaint(rect());
>
> If it is only nessecairy on Mac, then I would make sure it is only done
> on Mac too. Use conditional compilation for that.
>
> André
>
>
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