控件相对主框架移动

void moveLable::mousePressEvent(QMouseEvent *event){    m_IsmousePress = true;    if(event->buttons() == Qt::LeftButton)    {        this->setCursor(Qt::ClosedHandCursor);        m_windowPos = this->pos();        m_mousePos = event->globalPos();        m_dPos = m_mousePos - m_windowPos;    }    else if(event->buttons() == Qt::RightButton)    {    }}

void moveLable::mouseMoveEvent(QMouseEvent *event){    if(m_IsmousePress && event->buttons() == Qt::LeftButton)    {        this->move(event->globalPos() - m_dPos);        emit moveBtn();    }}