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

[John Platt]

Hi Alex,

I have the same problem but regrettably no solution. When I switch tabs, 
tabs to the left are shown first then the active tab is drawn twice; 
firstly the image shifted to the top left and then finally in the 
correct position. I don't see garbage, just the hidden tabs.

Others have also reported 
thishttps://bugreports.qt.io/browse/QTBUG-21077 
<https://bugreports.qt.io/browse/QTBUG-21077>

Best regards

John.

On 23/01/2015 03:14, Alex Malyushytsky wrote:
> 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 <mailto: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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