[vtkusers] QVTKWidget only partially redrawing itself on win7 without AERO.

[Clinton Stimpson]

It was "fixed" then reverted because the fix was incorrect.

I've narrowed the problem down to a change of behavior in the Qt library, and reported it.
https://bugreports.qt-project.org/browse/QTBUG-23425

But I've not had much time to look further into it.
I would suggest working with the Qt developers to get this fixed.  If you can help with that, that would be great.
I think part of the problem is their QtGui library has code to make a QGLWidget work, but its difficult to turn the same code on for any other OpenGL based QWidget that doesn't derive from QGLWidget.

If you haven't voted for it, please do, so other Qt developers will notice.

Clint

On May 2, 2012, at 5:56 PM, Alex Malyushytskyy wrote:

> Problem on stable release of vtk 5.8.0
> 
> My application displays splash screen  while model is drawn.
> When splash screen is gone and user starts interaction with model,
> only part of the QVTKWidget is displaying correct picture,
> most area which was not  covered by splash screen remains unchanged
> (has whatever it displayed before interaction started).
> If QVTKWidget is minimized/maximized it fixes the problem.
> 
> If AERO is on everything works as expected.
> vtk version 4.* did not have such problem.
> 
> It seems any drawing which happens when QVTKWidget widget is
> covered(not only to the case of splashscreen)
> leeds to such nasty behaviour.
> 
> This makes vtk unusable on win 7 since I can't inforce user to have
> AERO on, not even counting that some computers might not be able to
> support it phisically.
> 
> It was an old  conversation about related topic at:
> http://vtk.1045678.n5.nabble.com/Problem-with-QVTKWidget-not-expanding-in-win7-td4533383.html
> 
> Even though it was stated that problem should be fixed in 5.8., it
> still remains.
> 
> Could anybody point which changes should be made to fix a problem and
> is there a way to push patch that problem finally is fixed in an
> official version?
> 
> Regards,
> 
> Alex
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