Can I mix QGraphicsOpacityEffect with animation

[Mihan]

Hi
I want to add animation to QGraphicsPixmapItem when it was added into the QGraphicsScene.
For example, when I add a QGraphicsPixmapItem, it will be movedfrom pos1 to pos2 , or showed from opacity(0) to opacity(1)

Regards
Mihan

[jsulm]

@Mihan Should be possible with https://doc.qt.io/qt-5/animation.html

[Mihan]

@jsulm
Oh maybe my description is not clear enough.

{
    // here has a item ready to be added
    QGraphicsPixmapItem *item = new QGraphicsPixmapItem();

    //I add effect 
    QGraphicsOpacity *effect = new QGraphicsOpacity();
    item ->setGraphicsEffect(effect);

    // add animation
    QPropertyAnimation *animation = new QPropertyAnimation(effect, "opacity");

    //but I don't know when the item is showed so that I don't know when the animation should be started.
    //If it has a function like QWidget::showEvent(). I could override it.

}

Also I want to make a CMyGraphicsPixmapItem based on QGraphicsPixmapItem with QPropertyAnimation QGraphicsOpacity

[mrjj]

Hi
You can try to use ItemChange
https://doc.qt.io/qt-5/qgraphicsitem.html#GraphicsItemChange-enum
it has info about visibility via QGraphicsItem::ItemVisibleChange

[Mihan]

@mrjj
Thank you , it should be what I need.