main.cpp

    QApplication app(argc, argv);//判断系统是否支持 系统托盘功能if (!QSystemTrayIcon::isSystemTrayAvailable()) {QMessageBox::critical(0, QObject::tr("Systray"),QObject::tr("I couldn't detect any system tray ""on this system."));return 1;}//关闭 隐式退出在最后一个窗口关闭时（这个示例该行语句注释也没区别）QApplication::setQuitOnLastWindowClosed(false);

windows.h

protected://重载关闭事件void closeEvent(QCloseEvent *event) override;private slots://点击托盘图标时的处理void iconActivated(QSystemTrayIcon::ActivationReason reason);//显示托盘弹出消息void showMessage();//点击托盘消息后的处理void messageClicked();private:   //托盘图标右键 菜单动作QAction *minimizeAction;QAction *maximizeAction;QAction *restoreAction;QAction *quitAction;//系统托盘QSystemTrayIcon *trayIcon;//托盘菜单QMenu *trayIconMenu;

void Window::createActions()
{minimizeAction = new QAction(tr("Mi&nimize"), this);connect(minimizeAction, &QAction::triggered, this, &QWidget::hide);maximizeAction = new QAction(tr("Ma&ximize"), this);connect(maximizeAction, &QAction::triggered, this, &QWidget::showMaximized);restoreAction = new QAction(tr("&Restore"), this);connect(restoreAction, &QAction::triggered, this, &QWidget::showNormal);quitAction = new QAction(tr("&Quit"), this);connect(quitAction, &QAction::triggered, qApp, &QCoreApplication::quit);
}void Window::createTrayIcon()
{trayIconMenu = new QMenu(this);trayIconMenu->addAction(minimizeAction);trayIconMenu->addAction(maximizeAction);trayIconMenu->addAction(restoreAction);trayIconMenu->addSeparator();trayIconMenu->addAction(quitAction);trayIcon = new QSystemTrayIcon(this);trayIcon->setContextMenu(trayIconMenu);
}//是否显示托盘图标connect(showIconCheckBox, &QAbstractButton::toggled, trayIcon, &QSystemTrayIcon::setVisible);//托盘消息点击事件    connect(trayIcon, &QSystemTrayIcon::messageClicked, this, &Window::messageClicked);//托盘图标点击事件connect(trayIcon, &QSystemTrayIcon::activated, this, &Window::iconActivated);void Window::closeEvent(QCloseEvent *event)
{//如果显示了托盘，关闭事件忽略，窗体隐藏if (trayIcon->isVisible()) {QMessageBox::information(this, tr("Systray"),tr("The program will keep running in the ""system tray. To terminate the program, ""choose <b>Quit</b> in the context menu ""of the system tray entry."));hide();event->ignore();}
}//托盘图标点击消息处理
void Window::iconActivated(QSystemTrayIcon::ActivationReason reason)
{switch (reason) {case QSystemTrayIcon::Trigger:case QSystemTrayIcon::DoubleClick: //改变图标iconComboBox->setCurrentIndex((iconComboBox->currentIndex() + 1) % iconComboBox->count());break;case QSystemTrayIcon::MiddleClick:showMessage();break;default:;}
}//显示消息
void Window::showMessage()
{showIconCheckBox->setChecked(true);QSystemTrayIcon::MessageIcon msgIcon = QSystemTrayIcon::MessageIcon(typeComboBox->itemData(typeComboBox->currentIndex()).toInt());if (msgIcon == QSystemTrayIcon::NoIcon) {QIcon icon(iconComboBox->itemIcon(iconComboBox->currentIndex()));trayIcon->showMessage(titleEdit->text(), bodyEdit->toPlainText(), icon,durationSpinBox->value() * 1000);} else {trayIcon->showMessage(titleEdit->text(), bodyEdit->toPlainText(), msgIcon,durationSpinBox->value() * 1000);}
}