[Qt-interest] how to make QGraphicsView updated as soon as possible?

[Mihail Naydenov]

Theoretically, you can try calling repaint() on the View or View's viewport().

Feedback if that worked.

MihailNaydenov


>
>From: "Zhao, Halley" <halley.zhao at intel.com>
>To: "qt-interest at trolltech.com" <qt-interest at trolltech.com>
>Sent: Sat, February 12, 2011 4:26:42 AM
>Subject: [Qt-interest] how to make QGraphicsView updated as soon as possible?
>
> 
>After QGraphicsItem::update() is executed, there is some delay to 
>QGraphicsItem::paint() is called. 
>
>This is not vital for common UI, but for a 30fps video frame update, this delay 
>introduce many issue.
> 
>How could I make QGraphicsView updated as soon as possible?
>Could I change the event loop to schedule the repaint as soon as possible?
> 
> 
>There is also a similar issue for Qt::QueuedConnection, there is visible delay 
>to invoke a method by QMetaObject::invokeMethod(this, method, 
>Qt::QueuedConnection);
>Could I reduce the delay? 
>(I can’t use Qt::DirectConnection because I need some code runs in Qt thread).
> 
>thanks
>ZHAO, Halley (Aihua)
>Email: halley.zhao at intel.com
>Tel: +86(21)61166476   iNet: 8821-6476
>SSG/OTC/Moblin 3W038 Pole: F4


      
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