qtDemo/Shell_NotifyIcon/widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include "menudialog.h"
#include <QDebug>
#include <QPushButton>
#include <QSystemTrayIcon>
#include <QMenu>
#include <QAction>
#include <QDebug>
#include <QWidgetAction>


Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    setWindowFlags(Qt::Tool);
    CreateSystemTrayIcon();    //创建托盘
}

Widget::~Widget()
{
    delete ui;
}

void Widget::CreateSystemTrayIcon()
{

    QWidgetAction *pWdtAction = new QWidgetAction(this);
    MenuDialog * menudialog = new MenuDialog();
    pWdtAction->setDefaultWidget(menudialog);

    //初始化菜单并添加项
    QMenu* trayMenu = new QMenu(this);//菜单
    trayMenu->addAction(pWdtAction);

    //创建一个系统托盘
    QSystemTrayIcon* trayIcon = new QSystemTrayIcon(this);
    trayIcon->setIcon(QIcon("://app.ico"));    //设置托盘图标
    trayIcon->setToolTip("Shell_Notify");      //鼠标放上去显示的东东
    trayIcon->setContextMenu(trayMenu);                                     //设置菜单
    trayIcon->show();

    connect(trayIcon, &QSystemTrayIcon::activated, this, [=](QSystemTrayIcon::ActivationReason reason)
    {
        menudialog->uodateNumbers();
        if( reason == 3){ //鼠标左键
            trayIcon->contextMenu()->exec(QCursor::pos());
        }
    });


}