|  | Home · All Classes · All Functions · Overviews

# environment.h Example File
script/context2d/environment.h

     /****************************************************************************
     **
     ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** Commercial Usage
     ** Licensees holding valid Qt Commercial licenses may use this file in
     ** accordance with the Qt Commercial License Agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and Nokia.
     **
     ** 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 1.1, 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 have questions regarding the use of this file, please contact
     ** Nokia at qt-info@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;

     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();

         QScriptEngine *engine() const;

     public slots:
         int setInterval(const QScriptValue &expression, int delay);
         void clearInterval(int timerId);

         int setTimeout(const QScriptValue &expression, int delay);
         void clearTimeout(int timerId);

     signals:
         void scriptError(const QScriptValue &error);

     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;
     };

     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);
     };

     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