QLabel 상속받은 클래스에 mouse event 달기

------- ccardlabel.h ----------------------

#ifndef CCARDLABEL_H

#define CCARDLABEL_H

#include <QLabel>

class CCardLabel:public QLabel

{

    Q_OBJECT

public:

    CCardLabel();

    CCardLabel(const QLabel &);

    bool eventFilter(QObject *object, QEvent *event);

signals:

    void mouseClicked();

};

#endif // CCARDLABEL_H

------- ccardlabel.cpp ---------------------- 

#include <QtGui>
#include "ccardlabel.h"
#include <QString>
#include <QLabel>
CCardLabel::CCardLabel()
{
    QLabel::QLabel("test2");
    this->installEventFilter(this);

}
bool CCardLabel::eventFilter(QObject *object, QEvent *event)
{
    if(event->type()==QMouseEvent::MouseButtonPress)
    {
        mouseClicked();
    }
    return QWidget::eventFilter(object,event);
}