一、描述
为避免错点关闭按钮，使得软件关闭退出。需要开发一种类似于QQ桌面之类的功能，点击关闭按钮并不退出，开发的应用程序在用户鼠标点击右上角的关闭按钮时，程序不退出，缩小到右下角，进入托盘。例如win10右下角的图标。
二、思路
1、需要对应用软件程序窗口的关闭按钮进行事件拦截，然后重载，用到QT的QDesktopServices类。
2、要使程序进入托盘，需要用到QT的QSystemTrayIcon类。
三、方法
1、添加头文件和成员
mainwindow.h 头文件中添加：#include <QSystemTrayIcon> //t托盘类#include <QDesktopServices> //桌面事件类private: QMenu *trayMenu;//托盘菜单QSystemTrayIcon *tray;//托盘图标添加成员2、构造函数初始化
//***托盘***tray= new QSystemTrayIcon(this);//初始化托盘对象traytray->setIcon(QIcon(QPixmap(":/image/image/icon_48px.png")));//设定托盘图标，引号内是自定义的png图片路径tray->setToolTip("My helper"); //提示文字QString title="APP Message";QString text="My helper start up";tray->show();//让托盘图标显示在系统托盘上tray->showMessage(title,text,QSystemTrayIcon::Information,3000); //最后一个参数为提示时长，默认10000，即10s//创建菜单项动作minimizeAction = new QAction("MinWin", this);connect(minimizeAction, SIGNAL(triggered()), this, SLOT(hide())); maximizeAction = new QAction("MaxWin", this);connect(maximizeAction, SIGNAL(triggered()), this, SLOT(showMaximized()))restoreAction = new QAction("restore", this);connect(restoreAction, SIGNAL(triggered()), this, SLOT(showNormal()));quitAction = new QAction("exit", this);connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit())); //关闭应用//创建托盘菜单trayMenu = new QMenu(this);trayMenu->addAction(minimizeAction);trayMenu->addAction(maximizeAction);trayMenu->addAction(restoreAction);trayMenu->addSeparator();trayMenu->addAction(quitAction);tray->setContextMenu(trayMenu);connect(tray,SIGNAL(activated(QSystemTrayIcon::ActivationReason)),this,SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));3、添加槽函数
void MainWindow::iconActivated(QSystemTrayIcon::ActivationReason ireason)
{switch (ireason){case QSystemTrayIcon::Trigger:this->showNormal();break;case QSystemTrayIcon::DoubleClick:this->showNormal();break;case QSystemTrayIcon::MiddleClick:break;default:break;}
}4、拦截桌面窗口事件
void MainWindow::closeEvent(QCloseEvent *event)
{if(tray->isVisible()){hide(); //隐藏窗口event->ignore(); //忽略事件}
}
void MainWindow::hideEvent(QHideEvent *event)
{if(tray->isVisible()){hide(); //隐藏窗口event->ignore(); //忽略事件}
}
