QWidget控件透明动画实现 要做子控件透明需要用到QGraphicsOpacityEffect类 使用例子如下代码:

QGraphicsOpacityEffect * m_pGraphicsOpacityEffect1;
QPropertyAnimation * m_pOpacityAnimation1;
 
m_pGraphicsOpacityEffect1 = new QGraphicsOpacityEffect(m_pHomeBtn);
m_pGraphicsOpacityEffect1->setOpacity(1.0);
m_pHomeBtn->setGraphicsEffect(m_pGraphicsOpacityEffect1);
 
m_pOpacityAnimation1 = new QPropertyAnimation(m_pGraphicsOpacityEffect1,"opacity",this);
m_pOpacityAnimation1->setDuration(m_nDuring);
m_pOpacityAnimation1->setStartValue(0);
m_pOpacityAnimation1->setEndValue(1.0);
m_pOpacityAnimation1->start();

QPropertyAnimation调用start可以设置 动画完成后自动delete