Qt: How do I handle the event of the user pressing the 'X' (close) button?

Question

I am developing an application using Qt. I don\'t know which slot corresponds to the event of \"the user clicking the \'X\'(close) button of the window frame\" i.e. this but

Answer 1

also you can reimplement protected member QWidget::closeEvent()

void YourWidgetWithXButton::closeEvent(QCloseEvent *event)
{
    // do what you need here
    // then call parent's procedure
    QWidget::closeEvent(event);
}