如何在QGraphicsScene上移动QDeclarativeItem？

Question

我想知道如何在QGraphicsScene上移动QDeclarativeItem。似乎这个项目抓住焦点或类似的东西。其他GraphicsItem的类型（如QGraphicsTextItem等）不会发生这种情况。有一些焦点政策或一些标志需要改变？ Thxs !!!

这是代码：

QGraphicsScene * m_scene = new QGraphicsScene(this);
QGraphicsView * m_view = new QGraphicsView(this);
m_view->setScene(m_scene);

QDeclarativeEngine m_engine;
QDeclarativeComponent component(&m_engine, QUrl::fromLocalFile("hello.qml"));
//With this item, it doesn't work!!!
QDeclarativeItem *item = qobject_cast<QDeclarativeItem *>(component.create());

//With this item, it works!!!
//QGraphicsTextItem * item = m_scene->addText("Hello!!!");

item->setFlags(QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable);

m_scene->addItem(item);

这是QML文件（hello.qml）：

import QtQuick 1.0

Rectangle {
     id: page
     width: 100; height: 20
     color: "lightgray"

     Text {
         id: helloText
         text: "Hello world!"
         anchors.horizontalCenter: page.horizontalCenter
         font.pointSize: 12; font.bold: true
     }
 }