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I want to take an action when a widget was resized.
Is there a way to catch that without installing an event filter on that widget (and, obviously, without subclassing it)? AFAIK, QWidget does not have a resized signal.
If you have any other QObject that can have strict relation to that QWidget you may use
QObject::installEventFilter(QObject * filter)and overloadbool eventFilter(QObject *, QEvent *). See more at Qt docs