问QQuickPaintedItem mouseReleaseEvent只在doubleclick之后被调用

EN

    void QWindow::mousePressEvent(QMouseEvent *ev)
    {
        ev->ignore();
    }
    void QWindow::mouseReleaseEvent(QMouseEvent *ev)
    {
        ev->ignore();
    }

    MyView::MyView(QQuickItem *parent):
        QQuickPaintedItem(parent)
    {
        setAcceptedMouseButtons(Qt::LeftButton);
    }

    void MyView::mousePressEvent(QMouseEvent *evt)
    {
        //gets called after every single mouse click
        qDebug("mousePressEvent");
        if(evt->button() == Qt::LeftButton)
        {
            //do something...
            evt->accept();
        }
        else
        {
            evt->ignore();
        }
        //DON'T DO THIS:
        //QQuickPaintedItem::mousePressEvent(evt);
    }

    void MyView::mouseReleaseEvent(QMouseEvent *evt)
    {
        //now gets called with every mouse release since we don't call the base class any more
        qDebug("mouseReleaseEvent");
        if(evt->button() == Qt::LeftButton)
        {
            //do something...
            evt->accept();
        }
        else
        {
            evt->ignore();
        }
        //DON'T DO THIS:
        //QQuickPaintedItem::mouseReleaseEvent(evt);
    }