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();
    }
}