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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef ENVIRONMENT_H
+#define ENVIRONMENT_H
+
+#include <qobject.h>
+#include <qlist.h>
+#include <qhash.h>
+#include <QTimerEvent>
+#include <QMouseEvent>
+#include <QKeyEvent>
+#include <QScriptEngine>
+#include <QScriptable>
+class QContext2DCanvas;
+
+//! [0]
+class Environment : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QScriptValue document READ document)
+public:
+    Environment(QObject *parent = 0);
+    ~Environment();
+
+    QScriptValue document() const;
+
+    void addCanvas(QContext2DCanvas *canvas);
+    QContext2DCanvas *canvasByName(const QString &name) const;
+    QList<QContext2DCanvas*> canvases() const;
+
+    QScriptValue evaluate(const QString &code,
+                          const QString &fileName = QString());
+
+    QScriptValue toWrapper(QObject *object);
+
+    void handleEvent(QContext2DCanvas *canvas, QMouseEvent *e);
+    void handleEvent(QContext2DCanvas *canvas, QKeyEvent *e);
+
+    void reset();
+//! [0]
+
+    QScriptEngine *engine() const;
+
+//! [1]
+public slots:
+    int setInterval(const QScriptValue &expression, int delay);
+    void clearInterval(int timerId);
+
+    int setTimeout(const QScriptValue &expression, int delay);
+    void clearTimeout(int timerId);
+//! [1]
+
+//! [2]
+signals:
+    void scriptError(const QScriptValue &error);
+//! [2]
+
+protected:
+    void timerEvent(QTimerEvent *event);
+
+private:
+    QScriptValue eventHandler(QContext2DCanvas *canvas,
+                              const QString &type, QScriptValue *who);
+    QScriptValue newFakeDomEvent(const QString &type,
+                                 const QScriptValue &target);
+    void maybeEmitScriptError();
+
+    QScriptEngine *m_engine;
+    QScriptValue m_originalGlobalObject;
+    QScriptValue m_document;
+    QList<QContext2DCanvas*> m_canvases;
+    QHash<int, QScriptValue> m_intervalHash;
+    QHash<int, QScriptValue> m_timeoutHash;
+};
+
+//! [3]
+class Document : public QObject
+{
+    Q_OBJECT
+public:
+    Document(Environment *env);
+    ~Document();
+
+public slots:
+    QScriptValue getElementById(const QString &id) const;
+    QScriptValue getElementsByTagName(const QString &name) const;
+
+    // EventTarget
+    void addEventListener(const QString &type, const QScriptValue &listener,
+                          bool useCapture);
+};
+//! [3]
+
+class CanvasGradientPrototype : public QObject, public QScriptable
+{
+    Q_OBJECT
+protected:
+    CanvasGradientPrototype(QObject *parent = 0);
+public:
+    static void setup(QScriptEngine *engine);
+
+public slots:
+    void addColorStop(qreal offset, const QString &color);
+};
+
+#endif