QPropertyAnimation feat QmainWindow::resizeEvent (...)
in the main application window (inherits from QMainWindow) displays two different widgets: QGraphicsView and QwtPlot (qwt-6.0.2). Switching between the widgets is doing by user and, it (switching) is animated (QPropertyAnimation).
How to resolve the situation: the user resizes the main window, and the animation is not finished yet? Stop animation, calculation to new coordinate, running animations - give no results.
The solution, which is given in the examples i can't use. It has the all controls on the QGraphicsView and calls QGraphicsView :: fitInView (QRect, QAspectRation) simply by scaling the entire contents of the window, so that, the controls are scaled as pictures.