After obtaining the winId of a widget control, it fails to receive hovering TabletMove events.

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    m_formView = new Form(this);
//    m_formView->winId();
    m_formView->installEventFilter(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{

    if(event->type() == QEvent::TabletMove ||
            event->type() == QEvent::TabletPress ||
            event->type() == QEvent::TabletRelease ||
            event->type() == QEvent::TabletEnterProximity ||
            event->type() == QEvent::TabletLeaveProximity ||
            event->type() == QEvent::TabletTrackingChange
            ){
        qInfo() << "eventFilter Tablet evevt:" << event;

        QTabletEvent *tabletEvent = static_cast<QTabletEvent*>(event);

        tabletEvent->buttons();
        tabletEvent->accept();
        return true;
    }

    return false;
}

//代码占位符
    // All tablet events that are not accepted by the application will be translated to mouse events instead.
    // This attribute is enabled by default. This value was added in Qt 5.7.
    QCoreApplication::setAttribute(Qt::AA_SynthesizeMouseForUnhandledTabletEvents, false);

// log
Form eventFilter1: QTabletEvent(TabletMove, deviceType=Stylus, pointerType=Pen, uniqueId=-838855321, pos=QPointF(24.3694,428.29), z=0, xTilt=0, yTilt=0, NoButton, pressure=0 isAccepted= false
Form eventFilter2: QTabletEvent(TabletMove, deviceType=Stylus, pointerType=Pen, uniqueId=-838855321, pos=QPointF(24.3694,428.29), z=0, xTilt=0, yTilt=0, NoButton, pressure=0
Form::event= QTabletEvent(TabletMove, deviceType=Stylus, pointerType=Pen, uniqueId=-838855321, pos=QPointF(24.3694,428.29), z=0, xTilt=0, yTilt=0, NoButton, pressure=0
Form eventFilter1: QMouseEvent(MouseMove, localPos=24,428, screenPos=704,823) isAccepted= true
Form eventFilter2  QMouseEvent(MouseMove, localPos=24,428, screenPos=704,823) source= Qt::MouseEventNotSynthesized
Form::event= QMouseEvent(MouseMove, localPos=24,428, screenPos=704,823)