gistfile1.txt

#include <QApplication>
#include <QTimer>
#include <QtDeclarative>
#include <QDebug>

class WebView : public QDeclarativeItem
{
};

class WebViewExperimental : public QObject
{
    Q_OBJECT

    Q_PROPERTY(bool webGLEnabled READ webGLEnabled WRITE setWebGLEnabled)

public:
    WebViewExperimental(QObject *parent = 0) : QObject(parent)
    {
        QTimer::singleShot(2000, this, SIGNAL(someRandomThingChanged()));
    }

    Q_INVOKABLE void yeah() { qDebug() << "Yeah"; }

    bool webGLEnabled() const { return true; }
    void setWebGLEnabled(bool enabled) {}

signals:
    void someRandomThingChanged();
};

class WebViewExperimentalExtension : public QObject
{
    Q_OBJECT

    Q_PROPERTY(WebViewExperimental* experimental READ experimental)
public:
    WebViewExperimentalExtension(QObject *extended = 0)
        : QObject(extended)
        , m_experimental(new WebViewExperimental(this))
    {
    }

    WebViewExperimental *experimental() { return m_experimental; }
private:
    WebViewExperimental *m_experimental;
};

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

    qmlRegisterType<WebView>("QtWebKit", 3, 0, "WebView");

    qmlRegisterExtendedType<WebView, WebViewExperimentalExtension>("QtWebKit.experimental", 3, 1, "WebView");
    qmlRegisterUncreatableType<WebViewExperimental>("QtWebKit.experimental", 3, 1, "WebViewExperimental",
                                                    QString("Can't create instances of WebViewExperimental"));

    QDeclarativeView view;
    view.setSource(QUrl("qrc:/main.qml"));
    view.show();
    view.raise();

    return app.exec();
}

#include "main.moc"

--- 8< ---

import QtQuick 1.1

import QtWebKit 3.0
import QtWebKit.experimental 3.1

Rectangle {
    width: 800
    height: 600

    WebView {
        anchors.fill: parent

        experimental {
            webGLEnabled: false

            onSomeRandomThingChanged: experimental.yeah()
        }
    }
}