QT设计状态栏图标

lsyer

不论处于什么理由，往往程序运行时喜欢在状态栏处显示图标，并且经常可以看到最小化或者关闭时隐藏至状态栏图标功能。在QT中实现相当简单，给类加入几个私有成员函数和私有SLOT，而后在类的构造函数里创建联接监听关系，并重载退出函数closeEvent()函数就可以很轻松实现。废话少说，且看代码：
netsharer.h部分源码
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class netsharer:public QDialog,public Ui::netsharer
{
    Q_OBJECT
public:
    netsharer(QWidget *parent=0);
protected:
    void closeEvent ( QCloseEvent * event );
private:
    ......
    void createActions();
    void createTrayIcon();
    QAction *minimizeAction;
    QAction *maximizeAction;
    QAction *restoreAction;
    QAction *quitAction;

    QSystemTrayIcon *trayIcon;
    QMenu *trayIconMenu;
private slots:
    ......
    void iconActivated(QSystemTrayIcon::ActivationReason reason);
    void quitaction();
};

netsharer.cpp部分源码：
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netsharer::netsharer(QWidget *parent)
    :QDialog(parent)
{
    ......
    createActions();
    createTrayIcon();
    connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
            this, SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));
    QIcon icon = QIcon(":/images/icon.png");
    trayIcon->setIcon(icon);
    setWindowIcon(icon);
    trayIcon->setToolTip("Net Sharer 0.4.2");
    trayIcon->show();
}
void netsharer::closeEvent ( QCloseEvent * event )
{
        QMessageBox::information(this, tr("Net Sharer"),
                                 tr("The program will keep running in the "
                                    "system tray. To terminate the program, "
                                    "choose <b>Quit</b> in the context menu "
                                    "that pops up when clicking this program's "
                                    "entry in the system tray."));
        hide();
        event->ignore();
}

void netsharer::createActions()
{
    minimizeAction = new QAction(tr("Mi&nimize"), this);
    connect(minimizeAction, SIGNAL(triggered()), this, SLOT(hide()));

    maximizeAction = new QAction(tr("Ma&ximize"), this);
    connect(maximizeAction, SIGNAL(triggered()), this, SLOT(showMaximized()));

    restoreAction = new QAction(tr("&Restore"), this);
    connect(restoreAction, SIGNAL(triggered()), this, SLOT(show()));

    quitAction = new QAction(tr("&Quit"), this);
    connect(quitAction, SIGNAL(triggered()), this, SLOT(quitaction()));
}

void netsharer::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);
}
void netsharer::iconActivated(QSystemTrayIcon::ActivationReason reason)
{
    switch (reason) {
    //case QSystemTrayIcon::Trigger:
    case QSystemTrayIcon::DoubleClick:
    setVisible(isHidden());
        break;
    //case QSystemTrayIcon::MiddleClick:
        //showMessage();
        //break;
    default:
        ;
    }
}
void netsharer::quitaction()
{
    if (runbutton->isEnabled())
    {
        qApp->quit();
    }
    int r=QMessageBox::warning(this,tr("NetSharer"),QString::fromLocal8Bit("服务正在运行中\n是否立刻退出？"),QMessageBox::Yes|QMessageBox::Default,QMessageBox:: Cancel|QMessageBox::Escape);
    if (r==QMessageBox::Yes)
    {
        stopsharer();
        qApp->quit();
    }
}
其实最重要的就是黑体部分。
代码简单，不必细说，只用加到相应位置即可。