QT实现最小化到Icon单击双击显示窗口

最近在学习用QT开发一个项目，参考了网上的例子完成了一个QT实现最小化到Icon单击双击显示窗口的例子，分享给大家，也感谢大家的网络分享。项目会放在www.pavogroup.top上面，大家可以参考一下。

 

在头文件里面定义bool isIconExist；以避免重复创建多个icon。

void HelpDeskClientDialog::changeEvent(QEvent *event)

{

    if((event->type()==QEvent::WindowStateChange)&&isMinimized())

    {

        hide();

        event->ignore();

        //初始化两个项目

        QSystemTrayIcon* trayIcon = new QSystemTrayIcon(this);

        QAction* showAction = new QAction(QStringLiteral("Display Window"));//项1

        QAction* exitAction = new QAction(QStringLiteral("EXIT"));//项2

        //项1的点击槽函数

        connect(showAction, &QAction::triggered, this, [=]()

        {

            this->show();

        });

        //项2的点击槽函数

        connect(exitAction, &QAction::triggered, this, [=]()

        {

            qDebug()<<"exit";

            QApplication::exit(0);

        });

        connect(trayIcon,SIGNAL(activated(QSystemTrayIcon::ActivationReason)),this,SLOT(on_activatedSysTrayIcon(QSystemTrayIcon::ActivationReason)));

        //初始化菜单并添加项

        QMenu* trayMenu = new QMenu(this);//菜单

        trayMenu->addAction(showAction);

        trayMenu->addAction(exitAction );

        //创建一个系统托盘

        if(isIconExist == true)

        {

            return;

        }

        else

        {

            trayIcon->setIcon(QIcon(":/Icon/bird2.png"));    //设置托盘图标

            trayIcon->setContextMenu(trayMenu);                                     //设置菜单

            trayIcon->setToolTip ("Super HelpDesk");

            trayIcon->show();

            isIconExist = true;

        }

    }

}

void HelpDeskClientDialog::on_activatedSysTrayIcon(QSystemTrayIcon::ActivationReason reason)

{

    switch(reason)

    {

        case QSystemTrayIcon::Trigger:

            //单击托盘图标

            this->showNormal();

            break;

        case QSystemTrayIcon::DoubleClick:

            //双击托盘图标

            //双击后显示主程序窗口

            this->showNormal();

            break;

        default:

            break;

    }

}