connect(m_pTrayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
        this,        SLOT(onActivated(QSystemTrayIcon::ActivationReason)));

// Slot to handle tray icon activated signal
void MyClass::onActivated(QSystemTrayIcon::ActivationReason r)
{
    if (r == QSystemTrayIcon::Trigger)
    {
        if (!this->isVisible())
        {
            this->show();
        }
        else
        {
            this->hide();
        }
    }
}

I want to be able to either:

• emit activated signal on single mouse click

• detect a single mouse click event on the system tray icon