class QClickWidget : public QWidget{  
pubilc:  
    QClickWidget(QWidget *parent = 0)  
    ~QClickWidget();  
  
signals:  
    void clicked();  
  
public slots:  
    void mouseClicked();  
  
protected:  
    void mousePressEvent(QMouseEvent *ev);  
    void mouseReleaseEvent(QMouseEvent *ev);  
  
private:  
    QPoint mousePos;  
};
 
QClickWidget::QClickWidget(){  
    connect(this, SIGNAL(clicked()), this, SLOT(mouseClicked()));  
}
 
void QClickWidget::mouseClicked()  
{  
    //处理代码  
}
 
void QClickWidget::mousePressEvent(QMouseEvent *ev)  
{  
    mousePos = QPoint(ev->x(), ev->y());  
}
 
void QClickWidget::mouseReleaseEvent(QMouseEvent *ev)  
{  
    if(mousePos == QPoint(ev->x(), ev->y())) emit clicked();  
}