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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