Question

How to make Esc key to minimize a dialog? By default it closes. Should I process KeyEvent or there is a better way?

Answer 1

I think you may use this:

void MyDialog::keyPressEvent(QKeyEvent *e) {
    if(e->key() != Qt::Key_Escape)
        QDialog::keyPressEvent(e);
    else {/* minimize */}
}

Also have a look at Events and Event Filters docs.