Event propagation in Qt

I believe the best practice is to explicitly forward the events to the base-class event method if you do not wish to filter that event type (e.g. return QObject::event(event);) since the event function delegates events to specific handlers (e.g. QWidget::keyPressEvent).

QCoreApplication::notify propogates events based on the return value. On true, it considers the event as consumed and stops. Otherwise, the event is passed to the object's parent. For more information, see Events and Filters and Another Look at Events.