QT嵌于某个页面中的多个视频窗口如何显示全屏与恢复

显示全屏：

for (int i = 0; i < 4; ++i)

    {

    m_qPlayWnd[i]->setWindowFlags(Qt::Window);

    m_qPlayWnd[i]->showNormal();

    }

    HideParentForVideo();

    for (int i = 0; i < 4; ++i)
    {

    m_qPlayWnd[i]->setGeometry(...);

    }

恢复：

for (int i = 0; i < 4; ++i)

    {
        m_qPlayWnd[i]->setWindowFlags(Qt::Widget);

    }

    ShowParent();

    update();