[SOLVED] Problems animating QGraphicsProxyWidget
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Hi All,
I'm trying to animate a push button I have in my scene.
I want the button to become visible with an animation when the mouse enters the scene (essentially gradually changing the opacity of the button from 0 to 1)The QPropertyAnimation class seems to be exactly what I need but it is not working with QGraphicsProxyWidget.
This is the way I'm creating the button when I initialize the interface of the QGraphicsView@void MyQGraphicsView::buildInterface(){
....
myButton = new QPushButton(this); // myButton member QPushButton variable
myButtonProxy = scene()->addWidget(myButton); // myButtonProxy member QGraphicsProxyWidget variable
...
}void MyQGraphicsView::enterEvent( QEvent * )
{
QPropertyAnimation *animation = new QPropertyAnimation(myButtonProxy, "opacity");
animation->setDuration(1000);animation->setStartValue(0); animation->setEndValue(1); animation->start(QAbstractAnimation::DeleteWhenStopped);
}@
The animation has no effect on the opacity of the button. I also tried for test to modify with an animation the position of the button. Well If I create the QPropertyAnimation using the proxy widget then the animation is not working, if I create it using the button itsself then the animation is working (see example below)
@void MyQGraphicsView::enterEvent( QEvent * )
{
// QPropertyAnimation *animation = new QPropertyAnimation(myButtonProxy, "pos"); // DOES NOT WORK
QPropertyAnimation *animation = new QPropertyAnimation(myButton, "pos");
animation->setDuration(1000);animation->setStartValue(QPointF(0,0)); animation->setEndValue(QPointF(scene()->width()/2, scene()->height()/2)); animation->start(QAbstractAnimation::DeleteWhenStopped);
}@
I'm using Qt 4.7.3
Do you have any idea how to fix this issue?Thanks in advance,
Calogero -
i think, you should not give a parent object when creating QPushButton;
like,myButton = new QPushButton();
(not, myButton = new QPushButton(this);)embeded widget will be destroyed when proxy is being destructed (by QGraphicsProxyWidget documentation)
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thank you very much jys0224!
It seems that was the problem.