QT中显示右下角托盘图标

QT中显示托盘图标使用QSystemTrayIcon类：

    m_trayIcon = new QSystemTrayIcon(this);           

    m_trayIcon->setIcon(QIcon(":/image/myico.ico"));     //设置图标

    m_trayIcon->setToolTip(tr("Known image viewer"));    //设置鼠标放上去显示的信息

    QMenu *menu = new QMenu(this);			 //右键菜单

    menu->addAction(ui->action_O);                       //这几个action是在设计师下添加的

    menu->addAction(ui->action_P);

    menu->addAction(ui->action_N);

    menu->addAction(ui->action_L);

    menu->addAction(ui->action_R);

    menu->addAction(ui->action);

    menu->addAction(ui->action_Q);

    m_trayIcon->setContextMenu(menu); 			 //设置右键菜单

    connect(m_trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),

            this, SLOT(slotIconActivated(QSystemTrayIcon::ActivationReason)));

    m_trayIcon->show();					 //显示

void ImageDisplay::slotIconActivated(QSystemTrayIcon::ActivationReason reason)

{

    switch(reason)

    {

    case QSystemTrayIcon::Trigger :

        setWindowState(Qt::WindowActive);

        activateWindow();

        break;

    default:

        break;

    }

}