#include <QApplication>
#include <QObject>
#include <QWidget>
#include <QLabel>
#include <QMouseEvent>

class myLabel : public QLabel
{
        Q_OBJECT
        public:
                void mouseReleaseEvent(QMouseEvent *e);
                myLabel(QWidget *parent = 0);
          ~myLabel();
signals:
                void clicked();
};

myLabel::myLabel(QWidget *parent) : QLabel(parent)
{
}

myLabel::~myLabel()
{
}

void myLabel::mouseReleaseEvent(QMouseEvent* e)
{
        if (e->button() == Qt::LeftButton)
                setText("Left Clicked");

        if (e->button() == Qt::MidButton)
                setText("Mid Clicked");

        if (e->button() == Qt::RightButton)
                setText("Right Clicked");

        QLabel::mouseReleaseEvent(e);
        emit clicked();
}

int main (int argc, char *argv[])
{
        QApplication app(argc, argv);
        myLabel lbl;
        QObject::connect(&lbl, SIGNAL(clicked()), &app, SLOT(close()));
        lbl.setGeometry(512,100,100,10);
        lbl.show();

        app.exec();
}

#include "main.moc"

//-----------------------------
// &#1082;&#1086;&#1084;&#1087;&#1080;&#1083;&#1080;&#1090;&#1100; &#1090;&#1072;&#1082;:
// qmake -project
// qmake
make