拖动控件，即拖动窗口

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virtual voidmousePressEvent(QMouseEvent* e);    // 鼠标的单击事件

virtual voidmouseMoveEvent(QMouseEvent* e);    // 鼠标的移动事件

virtualvoid mouseReleaseEvent(QMouseEvent* e);  // 鼠标的单击释放事件

bool m_bIsWindowMoveable;

voidClassName::mousePressEvent(QMouseEvent* e)
{
         if(e->button() ==  Qt::LeftButton)
         {
                   m_bIsWindowMoveable = true;
         }
}

void ClassName:mouseMoveEvent(QMouseEvent*e)
{
         if(m_ bIsWindowMoveable)
         {
                   move(e->globalPos());
         }
}

voidClassName::mouseReleaseEvent(QMouseEvent* e)
{
         m_bIsWindowMoveable = false;
}