[vtkusers] QVtkWidgets problem with Qt::PaintOnScreen attribute and Aero

Alex Malyushytsky malyushytsky at gmail.com
Thu Jan 22 22:14:38 EST 2015

QGLWidget produces the same behavior. It looks like QMdiArea approach to
handle subwindows even in tabbed view mode requires double buffering to
work properly.
Otherwise all widgets with transparency ( using Aero ) display garbage when
become active.
At this point I could not find any solution to fix it other than removing
Qt::PaintOnScreen attribute.

Any suggestions?
Best regards,

On Wed, Jan 21, 2015 at 12:51 PM, Alex Malyushytsky <malyushytsky at gmail.com>

> I have multiple QVtkWidgets in QMDiArea in a tabbed view.
> I found that switching tabs with such QVtkWidgets  shows garbage for a
> noticeable time if Aero scheme on Windows is set.
> Removing Qt::PaintOnScreen attribute from QVtkWidget fixes the problem.
> But even though I do not see any side effects that does not mean they do
> not exist.
> At the same time Qt 4.8.6 states that this flag is only supported on X11.
> SO questions are:
> - what can go wrong with having double buffering of QVtkWidget?
> - Is there any other way to remove flickering during resize?
> Best regards,
>   Alex
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