[Gambas-devel] DrawingArea, SetFocus, BUG ?

[Benoit Minisini]

On Thursday 21 October 2004 13:38, Christian Faure wrote:
> Hi Benoit,
>
> Working on a ReportDesigner, i get somes problems:
>
> The IDE of ReportDesigner work creating and placing objects in a ScrollView
> using a toolbox and allow drag and drop to move objects.
>
> These objects are DrawingArea's
>
> I call a DrawingArea.SetFocus() function to enable each object to handle
> keyboard events.
>
> All work  ok, except when i  move an object outside of visible area and
> this object lose focus, then app crash with:
>      QPainter::begin: Cannot paint null pixmap
>      QPainter::setWorldMatrix: Will be reset by begin()
>
> Attached file provide a small example of the problem
>
> Thanks

I found the bug: when the drawing area is not visible, qt sends a paint event 
with a null width and height, which is a case I didn't test.

Here is a patch that solves the problem.

Regards,

-- 
Benoit Minisini
mailto:gambas at ...1...
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