Qt 的坐标系统

    QWidget *q = new QWidget(, Qt::WindowStaysOnTopHint);
    q->setWindowTitle(QObject::tr("父窗口widget"));

    qDebug()<<"x "<<q->x();
    qDebug()<<"y "<<q->y();
    qDebug()<<"framegeometry "<<q->frameGeometry();
    qDebug()<<"geometry "<<q->geometry();
    qDebug()<<"pos "<<q->pos();
    qDebug()<<"rect "<<q->rect();