get QGraphicsView's border like frame pointer?

i use QGraphicsScene and QGraphicsView to scale the child widget. now i want to move the child widget like the border frame, not just in the QGraphicsView.please help me how to do this?

my code is:

Code:

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QASelectFrame::QASelectFrame(QWidget *parent) : QFrame(parent), ui(new Ui::QASelectFrame)
{
    ui->setupUi(this);
 
    m_scene = new QGraphicsScene;
    m_scene->addWidget(this);
    m_view = new QGraphicsView(m_scene);
    //m_view->setFrameShape(QFrame::NoFrame);
    m_view->setStyleSheet("border: 0px");
 
    m_view->setWindowFlags(Qt::Window | Qt::FramelessWindowHint);
    m_view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    m_view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    m_view->setContentsMargins(QMargins());
 
    // title area
    setTitleText(tr("Selector"));
}

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progress like :
Attachment 12985