qt_tray_icon_test.cpp

#include <QApplication>
#include <QDebug>
#include <QSystemTrayIcon>
#include <QMenu>
#include <QAction>
#include <QIcon>
#include <QThread>
#include <QObject>
#include <QFile>
#include <QIODevice>
#include <QMessageBox>

#include <cstdlib>

class Test : public QThread
{
public:
    explicit Test( const int id ) : _id{ id }
    {
        qDebug() << "Test constructor called! id:" << _id;
    }

    virtual ~Test()
    {
        qDebug() << "Test deconstructor called! id:" << _id;
    }

    void run() override final
    {
        QFile file { "./test.txt" };
        file.open( QIODevice::ReadWrite );

        QTextStream stream { &file };

        while( !isInterruptionRequested() )
        {
            qDebug() << "id:" << _id;

            stream << "id:" << _id << "\n" << flush;

            QThread::sleep( 1 );
        }

        file.close();
    }

private:
    int _id;
};

class Test1
{
public:
    explicit Test1()
    {
        qDebug() << "Test1 constructor called!";
    }

    ~Test1()
    {
        qDebug() << "Test1 deconstructor called!";
    }
};

int main( int argc, char *argv[] )
{
    QApplication app( argc, argv );

    if ( !QSystemTrayIcon::isSystemTrayAvailable() )
    {
        qDebug() << "Sytem tray is not availabe!";
        return 0;
    }

    QSystemTrayIcon icon {};

    QMenu menu {};
    menu.addSection( QApplication::tr("Main") );
    menu.addAction( QApplication::tr("File") );
    menu.addAction( QApplication::tr("Edit") );
    menu.addSeparator();
    menu.addAction( QApplication::tr("Quit"), []()
    {
        qDebug() << "Quitting...";
        qApp->quit();
    });

    icon.setIcon( QIcon("c:/icons/undo.ico") );
    icon.setContextMenu( &menu );

    icon.show();
    icon.showMessage( "Test", "Hello World!",
                      QSystemTrayIcon::Information, 2 );

    Test test { 1 };
    test.start();

    Test1 test1 {};

    QObject::connect( &app, &QApplication::aboutToQuit, [&test, &icon]()
    {
        icon.showMessage( "Quit", "Quitting...",
                          QSystemTrayIcon::Information, 1 );

        qDebug() << "aboutToQuit";

        if ( test.isRunning() )
        {
            test.requestInterruption();
            test.wait();
        }
    });

    return app.exec();
}