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

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     #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