[Qgis-developer] QgsMapCanvas::paintEvent() too frequent

[Tim Sutton]

Hi

I doesn't actually redraw the map ten times though does it? It doesn't seem
to for me....

Regards

Tim


On Fri, Jan 17, 2014 at 1:09 PM, Radim Blazek <radim.blazek at gmail.com>wrote:

> More observations.
>
> When mouse enters the map canvas, first 10 (unwanted?) paintEvents
> are caused by QEvent::HoverMove. Following QEvent::HoverMove events
> are not causing additional paintEvents.
>
> Single QEvent::HoverLeave is followed by 10 paintEvents (QEvent::Paint
> - Screen update necessary).
>
> QEvent::WindowActivate (restore) is also followed by 10 additional (11
> in total) paintEvents().
>
> Setting stylesheet, for example: setStyleSheet(":hover
> {background-color: #ff0000;}");
> increases the number of paintEvents to 20.
>
> Radim
>
> On Thu, Jan 16, 2014 at 8:53 PM, Radim Blazek <radim.blazek at gmail.com>
> wrote:
> > QgsMapCanvas::paintEvent() is called too frequently on my X11, for
> example:
> > - 11 times when mouse enters map canvas (if QGIS does not have focus)
> > - 10 times when mouse leaves map canvas
> > - 13 times when minimized QGIS is restored
> > etc.
> >
> > Does anybody know why and how it could be reduced?
> >
> > Radim
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> Qgis-developer at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>



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