When do QWidget parent methods need to be called?

DaveR

It's a little unclear to me when parent methods need to be called.

Is it always/ever necessary to call the parent method when overriding in a subclass?

void resizeEvent(QResizeEvent* ev) override {
  QWidget::resizeEvent(ev);
  ...
}

Eg for:

void mousePressEvent(QMouseEvent*)
void mouseMoveEvent(QMouseEvent*)
void mouseReleaseEvent(QMouseEvent*)
void moveEvent(QMouseEvent*)
void resizeEvent(QResizeEvent*)

SGaist

Hi,

It depends on what your subclass does and if it needs the original behavior to take place.

JKSH

From the documentation (http://doc.qt.io/qt-5/qobject.html#event): "Make sure you call the parent event class implementation for all the events you did not handle."

See the link for sample code.