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c++qtqt5qpropertyanimation

Animate the resizing of a QListView

I have a QListView which I can fit to contents by calling updateGeometry. Now I want to animate it. I cant use the resizeEvent, since it is calles after the widget has been resized. What is the proper place to start this animation, ergo which members are called internally?

Solution

  • Well, you should leave the QListView quite and focus instead on its model. Let's say that you have something like:

    QListView *myListView;

    In that case you should pay attention to its model, which means:

    QAbstractItemModel *myListModel(myListView->model());

    You can connect some slot (depending on when you want to start the animation, before or after the data is being fetched by the views), maybe something like:

    connect(myListModel, &QAbstractItemModel::rowsAboutToBeInserted, myHandlingObject, &MyHandlingObjectClass::myHandlingSlot);

    or:

    connect(myListModel, &QAbstractItemModel::rowsInserted, myHandlingObject, &MyHandlingObjectClass::myHandlingSlot);

    Inside MyHandlingObjectClass::myHandlingSlot() slot you will eventually start a QPropertyAnimation. I think it's not much more than this. Hope it helps!