How to focus menuBar() with Qt

Question

I have a working application. I added a menuBar() to the main window with some menus. Then, I hid it to free screen space. I wrote the code below so that when user presses ALT k

Answer 1

Have you tried just adding the setFocus command?

void MainWindow::keyPressEvent( QKeyEvent *k ) {
    if(k->modifiers() & Qt::AltModifier) {
        menuBar()->setHidden(!menuBar()->isHidden());
        menuBar()->setFocus(Qt::MenuBarFocusReason);
        if(menuBar()->hasFocus()) {
            QMessageBox::information(this, "Info", "Focus !");
        }
    }
}