#include <QGuiApplication>
#include <QQmlPropertyMap>
#include <QQmlContext>
#include <QQmlApplicationEngine>
#include <QQuickWindow>
#include <QTimer>
#include <QDebug>

class Object : public QObject
{
    Q_OBJECT
public:
    Object(QObject *parent = 0)
        : QObject(parent),
      m_propertyMap(0)
    {
        m_propertyMap = new QQmlPropertyMap;
    m_propertyMap->insert("name", QVariant(QString("John Smith")));
    m_propertyMap->insert("phone", QVariant(QString("555-5555")));

    QTimer::singleShot(2000, this, SLOT(changeData()));
    }

    QQmlPropertyMap *propertyMap() { return m_propertyMap; }

private Q_SLOTS:
    void changeData() {
        m_propertyMap->insert("name", "Smith John");
        m_propertyMap->insert("phone", "5555-555");
    }

    void dataChanged(const QString &key, const QVariant &data) {
        qDebug() << "property(" << key << ") = " << data;
    }

private:
    QQmlPropertyMap *m_propertyMap;

};

int main(int argc, char **argv)
{
    QGuiApplication app(argc, argv);
    Object object;
    QQmlApplicationEngine engine(QUrl::fromLocalFile("main.qml"));
    QObject *topLevel = engine.rootObjects().value(0);
    QQuickWindow *window = qobject_cast<QQuickWindow *>(topLevel);
    if (!window) {
        qWarning("Error: Your root item has to be a Window.");
        return -1;
    }

    QQmlContext *ctxt = engine.rootContext();
    ctxt->setContextProperty("testData", object.propertyMap());
    window->show();

    return app.exec();
}

#include "main.moc"