7-Get control coordinates

 // 获得相对于窗口的坐标
  QPoint sPoint1 = ui->textEdit->mapToParent(QPoint(0,0));
  qDebug() << "相对于窗口坐标:" << "(" << sPoint1.x() << "," << sPoint1.y() << ")";

  // 获得相对于屏幕的坐标
  QPoint sPoint2 = ui->textEdit->mapToGlobal(QPoint(0,0));
  qDebug() << "相对于屏幕坐标:" << "(" << sPoint2.x() << "," << sPoint2.y() << ")";