QVariantAnimation causes flickering on QWidget

[lamgi667]

Hi,

I'm using Qt 4.6 Cocoa libs under MAC OS X 10.6. I'm trying to create a window which is able to resize animated. Therefor I'm using the QVariantAnimation. If I'm donig so, the resizing causes annoying nimation, Ming, if the widget has actually no parent or/and has window frame with the typical window controls (close-, minimize- maximize button).

The code I'm using is:

QPropertyAnimation* animation   = new QPropertyAnimation(this, "size", this);
    QSize newSize                   = this->size();
    newSize.setHeight(400);
 
    animation->setEasingCurve( QEasingCurve::InSine);
    animation->setDuration(100);
 
    animation->setEndValue(newSize);
 
    QObject::connect(animation, SIGNAL(finished()), this, SLOT(animationDidFinish()));
    animation->start( QAbstractAnimation::DeleteWhenStopped );

QPropertyAnimation* animation   = new QPropertyAnimation(this, "size", this);
    QSize newSize                   = this->size();
    newSize.setHeight(400);
    
    animation->setEasingCurve( QEasingCurve::InSine);
    animation->setDuration(100);

    animation->setEndValue(newSize);
    
    QObject::connect(animation, SIGNAL(finished()), this, SLOT(animationDidFinish()));
    animation->start( QAbstractAnimation::DeleteWhenStopped );

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It doesn't matter if I#m using the size or geometry property. It seems to do this flcikering when updating it's geometry.
Does anyone has an idea how to avoid this?

Thanks
Stefan