bool MyLabel::event(QEvent *event)
{
    // 一般不会用来做事件拦截,通常用来做事件分发
    if(event->type() == QEvent::MouseButtonPress){
        QMouseEvent *ev=static_cast<QMouseEvent *>(event);
        QString str=  QString("Event:::鼠标摁下x = %1,y = %2").arg(ev->x()).arg(ev->y());
        qDebug()<<"我捕获到"<<str;
        return true;
    }
    return QLabel::event(event);
}