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

[Alex Malyushytsky]

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,
    Alex



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

> 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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