Qt如何通过pos()获取坐标信息

QPoint get_pos(QWidget* w, QWidget* parent)
{
	if ((QWidget*)w->parent() == parent) {
		return w->pos();
	}
	else {
		QPoint pos(w->pos());
		pos += get_pos((QWidget*)w->parent(), parent);
		return pos;
	}
}

void ShadowWidget::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton && !mouse_press) {
        mouse_press = true;
    }

    //窗口移动距离
    orig_point = event->globalPos();
    orig_pos = pos() ;
}

void ShadowWidget::mouseReleaseEvent(QMouseEvent *)
{
    if (mouse_press) {
        mouse_press = false;
    }
}

void ShadowWidget::mouseMoveEvent(QMouseEvent *event)
{
    //移动窗口
    if (mouse_press) {
        QPoint move_point = event->globalPos();
        move(move_point - orig_point  + orig_pos );  
        /*move是相对于桌面系统来移动widget，所以是相对于移动前
        widget在桌面系统的位置上来进行的,
        所以要加上orig_pos*/
    }
}