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.pro

QT       += core gui declarative

TARGET = Test4
TEMPLATE = app


SOURCES += main.cpp \
    switcher.cpp

OTHER_FILES += \
    qml1.qml \
    qml2.qml

HEADERS += \
    switcher.h

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switcher.h

#ifndef SWITCHER_H
#define SWITCHER_H

#include <QGraphicsScene>
#include <QtDeclarative>
#include <QGraphicsObject>

class QmlContainer : public QObject
{
	Q_OBJECT
public:
	QmlContainer(QString s,QDeclarativeEngine *engine);
	~QmlContainer();
	QGraphicsObject * retObj();

public slots:
	void click();
signals:
	void itemClicked();
private:
	QDeclarativeEngine *m_engine;
	QDeclarativeComponent *m_qmlComponent;
	QGraphicsObject *obj;
	QDeclarativeContext *m_qmlContext;

};

class Switcher : public QObject
{
    Q_OBJECT
public:
    Switcher(QGraphicsScene *scene,
	     QDeclarativeEngine *engine,
	     QObject *parent = 0);
    ~Switcher();
signals:

public slots:
	void changeqml();
private:
    QGraphicsScene *m_scene;
    QDeclarativeEngine *m_engine;
    QmlContainer *m_a;
    QmlContainer *m_b;
    QGraphicsObject *m_obj;
};



#endif // SWITCHER_H

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switcher.cpp

#include "switcher.h"

Switcher::Switcher(QGraphicsScene *scene,
		   QDeclarativeEngine *engine,
		   QObject *parent) :
    QObject(parent)
{
	m_scene = scene;
	m_engine = engine;

	m_a = new QmlContainer("qml1.qml", m_engine);
	m_obj = m_a->retObj();

	m_scene->addItem(qobject_cast <QGraphicsItem*> (m_obj));

	connect(m_a, SIGNAL(itemClicked()), this, SLOT(changeqml()));
}

Switcher::~Switcher()
{}

void Switcher::changeqml()
{
	qDebug("CHANGE");
	m_scene->removeItem(qobject_cast <QGraphicsItem*> (m_obj));

	m_b = new QmlContainer("qml2.qml", m_engine);
	m_obj = m_b->retObj();
	m_scene->addItem(qobject_cast <QGraphicsItem*> (m_obj));

	delete m_a;
}

QmlContainer::QmlContainer(QString s, QDeclarativeEngine *engine)
	: QObject(0)
{
	m_engine = engine;
	m_qmlContext = new QDeclarativeContext(m_engine->rootContext());
	m_qmlContext->setContextProperty("qmlcontainer",  this);
	m_qmlComponent = new QDeclarativeComponent(m_engine,
						    QUrl(s),
						    this);
	obj = qobject_cast<QGraphicsObject *>(m_qmlComponent->create(m_qmlContext));
}

QmlContainer::~QmlContainer()
{
	delete obj;
	delete m_qmlComponent;
}

QGraphicsObject * QmlContainer::retObj()
{
	return obj;
}

void QmlContainer::click()
{
	qDebug("Click");
	emit itemClicked();
}

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main.cpp

#include <QApplication>
#include <QGraphicsView>
#include <QtDeclarative>
#include <QObject>
#include "switcher.h"

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);

	QDeclarativeEngine *engine = new QDeclarativeEngine;
	QGraphicsScene *scene = new QGraphicsScene;
	QGraphicsView view(scene);
	view.resize(320,240);
	view.show();

	Switcher c(scene, engine);

	return app.exec();
}

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qml1.qml
import Qt 4.7

Rectangle {
    width: 320
    height: 240

    Text {
	id: text1
	x: 150
	y: 114
	width: 80
	height: 20
	text: "Text One"
    }

    MouseArea {
	id: mouse_area1
	x: 0
	y: 0
	width: 320
	height: 240

	onClicked: {
		qmlcontainer.click();
	}
    }
}

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qml2.qml

import Qt 4.7

Rectangle {
    width: 320
    height: 240
    color: "#ff0000"
}