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# qcontext2dcanvas.h Example File
script/context2d/qcontext2dcanvas.h

     /****************************************************************************
     **
     ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 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 GNU
     ** General Public Licensing requirements will be met:
     ** http://www.trolltech.com/products/qt/opensource.html
     **
     ** If you are unsure which license is appropriate for your use, please
     ** review the following information:
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     ** sales department at sales@trolltech.com.
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #ifndef QCONTEXT2DCANVAS_H
     #define QCONTEXT2DCANVAS_H

     #include <qscriptengine.h>
     #include <qscriptcontext.h>
     #include <qscriptvalue.h>

     #include <QWidget>
     #include <QTimer>

     class QPaintEvent;
     class QResizeEvent;
     class QMouseEvent;
     class Context2D;

     class QContext2DCanvas : public QWidget
     {
         Q_OBJECT
     public:
         QContext2DCanvas(QWidget *parent=0);
         ~QContext2DCanvas();

         QScriptEngine *engine();

     public slots:
         void setScriptContents(const QString &txt);
         QObject *getContext(const QString &str) const;
         void setInterval(const QScriptValue &func,
                          qreal interval);
         void resize(int w, int h);
     signals:
         void error(const QString &error, int lineno);
     protected:
         virtual void paintEvent(QPaintEvent *e);
         virtual void mouseMoveEvent(QMouseEvent *e);
         virtual void mousePressEvent(QMouseEvent *e);
         virtual void mouseReleaseEvent(QMouseEvent *e);
         virtual void keyPressEvent(QKeyEvent *e);
         virtual void keyReleaseEvent(QKeyEvent *e);
         virtual void resizeEvent(QResizeEvent *e);

     private:
         QScriptEngine      m_engine;
         QString            m_script;

         Context2D         *m_context;
         QScriptValue       m_self;
         QScriptValue       m_doc;

         QScriptValue       m_intervalFunc;
         QTimer             m_timer;

         bool               m_firstRun;

         QScriptValue       m_keyDownHandler;
         QScriptValue       m_keyUpHandler;
         QScriptValue       m_mouseDownHandler;
         QScriptValue       m_mouseUpHandler;
         QScriptValue       m_mouseMoveHandler;
     };

     #endif