[vtk-developers] Delayed mouse interaction due to event-loop bug in Qt5

Christoph Kolb c.kolb at dkfz-heidelberg.de
Fri Feb 27 08:59:51 EST 2015

I am not sure if the Qt5 bug is ever going to be fixed, because the 
report (and patch) is very old. It could even be intentional...
In the worst case, it might be necessary to compress the events in VTK. 
Or to prioritize them somehow.

But I'm still very curious why this issue is showing only on some 
machines. Is it possible that the rendering is just slower in my case?
I have compared my test execution times with those of
and they seem to be equal. Is the described problem also showing there?


On 02/21/2015 08:45 PM, Christoph Kolb wrote:
> Dear vtk developers,
> when I am using the QVTKWidget in VTK 6.1 with Qt5, the mouse
> interactions are severely delayed. I can reproduce this issue by
> starting the SimpleView example and rotating the text.
> I think that this might be caused by a bug in Qt5, where the mousemove
> events are flooding the event queue:
> https://bugreports.qt.io/browse/QTBUG-40889
> However, other Linux distributions and Windows seem to be unnaffected by
> this. I have only observed it with Archlinux (Qt 5.4.0) so far.
> Does anyone else have this problem, or do you know what else i could check?
> Thank you!
> Regards
> Christoph
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