qt设置标签渐渐褪去的效果

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m_nameLabel=new QLabel("我是传奇",this);
    //m_nameLabel->show();
    m_nameLabel->resize(70,50);
    m_nameLabel->setAlignment(Qt::AlignCenter);
    m_nameLabel->move(50,50);
    QPalette palette;
    palette.setColor(QPalette::Background,QColor(0,255,0));
    m_nameLabel->setPalette(palette);
    m_nameLabel->setAutoFillBackground(true);

    QGraphicsOpacityEffect *pButtonOpacity = new QGraphicsOpacityEffect(this);
    pButtonOpacity->setOpacity(1);
    m_nameLabel->setGraphicsEffect(pButtonOpacity);
   
    QPropertyAnimation *pOpacityAnimation1 = new QPropertyAnimation(pButtonOpacity, "opacity");
    pOpacityAnimation1->setDuration(5000);
    pOpacityAnimation1->setStartValue(1);
    pOpacityAnimation1->setEndValue(0);

    QPropertyAnimation *pOpacityAnimation2 = new QPropertyAnimation(pButtonOpacity, "opacity");
    pOpacityAnimation2->setDuration(2000);
    pOpacityAnimation2->setStartValue(0);
    pOpacityAnimation2->setEndValue(1);

    QSequentialAnimationGroup *pOpacityGroup = new QSequentialAnimationGroup(this);
    //pOpacityGroup->addPause(1000);
    pOpacityGroup->addAnimation(pOpacityAnimation1);
    //pOpacityGroup->addAnimation(pOpacityAnimation2);
	pOpacityGroup->start();

    //m_group = new QParallelAnimationGroup(this);
    //m_group->addAnimation(pOpacityGroup);
    //m_group->start();

效果如下：