How do I properly implement a “minimize to tray” function in Qt?

Question

How do I properly implement a \"minimize to tray\" function in Qt?

I tried the following code inside QMainWindow::changeEvent(QEvent *e), but the window

Answer 1

 void main_window::create_tray_icon()
 {
    m_tray_icon = new QSystemTrayIcon(QIcon(":/icon.png"), this);

    connect( m_tray_icon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(on_show_hide(QSystemTrayIcon::ActivationReason)) );

    QAction *quit_action = new QAction( "Exit", m_tray_icon );
    connect( quit_action, SIGNAL(triggered()), this, SLOT(on_exit()) );

    QAction *hide_action = new QAction( "Show/Hide", m_tray_icon );
    connect( hide_action, SIGNAL(triggered()), this, SLOT(on_show_hide()) );

    QMenu *tray_icon_menu = new QMenu;
    tray_icon_menu->addAction( hide_action );
    tray_icon_menu->addAction( quit_action );

    m_tray_icon->setContextMenu( tray_icon_menu );

    m_tray_icon->show();
  }

void main_window::on_show_hide( QSystemTrayIcon::ActivationReason reason )
{
    if( reason )
    {
        if( reason != QSystemTrayIcon::DoubleClick )
        return;
    }

    if( isVisible() )
    {
        hide();
    }
    else
    {
        show();
        raise();
        setFocus();
    }
}

That's how I realize a "minimize to tray". You can now minimize either by double clicking on the icon, or by right-clicking and selecting "Show/Hide" in the menu.