Qt QLabel添加cliked事件

#ifndef MYLABEL_H
#define MYLABEL_H

#include <QObject>
#include <QLabel>
class MyLabel : public QLabel
{
    Q_OBJECT
public:
    explicit MyLabel(QObject *parent = nullptr);

signals:
    void clicked(void);
public slots:
protected:
    virtual void mouseReleaseEvent(QMouseEvent * ev);

};

#endif // MYLABEL_H

#include "mylabel.h"

MyLabel::MyLabel(QObject *parent) : QLabel()
{

}

void MyLabel::mouseReleaseEvent(QMouseEvent *ev)
{
    Q_UNUSED(ev)
    emit clicked();
}