Repaint child without repainting parent widget



  • I have a parent widget ( QScrollArea ) to which I setWidget my custom QFrame containing some buttons. The QScrollArea has background set with stylesheet and my widget has transparent background. I want to make the QScrollArea not redraw its background each time my widget is moved because this slows down performance very much.

    What can I do?



  • The Qt::WA_OpaquePaintEvent seems to be what I need but setting this to the scroll area still erase the background before the paintEvent is called.


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