[Qt-interest] paint getting called continuously

[william.crocker at analog.com]

Parta wrote:
> I understand that paint will get called if its overridden. That's the
> whole purpose of overriding the virtual. The problems is "its getting
> called continuously, almost consuming the whole cpu even when I am not
> doing anything with it".



You are probably calling (directly or indirectly) update()
at some point during the paint event, which is scheduling
another paint event.


> I just launch the application and sit back  and it keeps painting the
> same thing again and again. I know that because I can see debug
> messages from paint function. It shouldnt paint the same thing again
> and again unless there is any change (its shown again or its geometry
> changes or its repositioned or update is called). But I am not doing
> anything with it. Why does the paint event gets generated continously
> in the first place in that scenario. I asked just to confirm that I am
> not making some mistake  and breaking my head over something that is
> some common/known mistake. I am sure its a mistake somewhere in the
> way I have written it.
> 
> Thanks
> Pritam
> 
> On 4/28/10, Ramesh <ramesh.bs at robosoftin.com> wrote:
>> Yes,
>> paint will get called, repetedly... if u override the paint method of any
>> inherited base class..
>>
>> -----Original Message-----
>> From: qt-interest-bounces at trolltech.com
>> [mailto:qt-interest-bounces at trolltech.com] On Behalf Of PGhanghas
>> Sent: Wednesday, April 28, 2010 2:21 PM
>> To: qt-interest at trolltech.com
>> Subject: [Qt-interest] paint getting called continuously
>>
>> Hi
>>
>> I have a QGV application. Application is simple, it uses some custom
>> classes subclassed from QGraphicsWidget.
>> But Its giving me strange behavior. paint of one of my custom widget is
>> getting called
>> continuously. I am using Qt 4.6.1. I am sure I am not changing geometry.
>> I understand that
>> it may be very difficult for some to diagnose a problem without any code
>> snippet. If I am not able to solve it in the mean time,
>> I will do that as well. Right now I am thinking has anyone else faced a
>> similar problem.
>>
>> Thanks,
>> Pritam
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>>
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