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# qcontext2dcanvas.h Example File

script/context2d/qcontext2dcanvas.h

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
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     ** modification, are permitted provided that the following conditions are
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     #ifndef QCONTEXT2DCANVAS_H
     #define QCONTEXT2DCANVAS_H

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

     #include <QWidget>

     class QPaintEvent;
     class QResizeEvent;
     class QMouseEvent;
     class QKeyEvent;

     class Environment;
     class Context2D;

     class QContext2DCanvas : public QWidget
     {
         Q_OBJECT
     public:
         QContext2DCanvas(Context2D *context, Environment *env, QWidget *parent = 0);
         ~QContext2DCanvas();

         Context2D *context() const;
         void reset();

     public slots:
         QScriptValue getContext(const QString &str);
         void resize(int width, int height);

         // EventTarget
         void addEventListener(const QString &type, const QScriptValue &listener,
                               bool useCapture);

     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 slots:
         void contentsChanged(const QImage &image);

     private:
         Context2D *m_context;
         Environment *m_env;
         QImage m_image;
     };

     #endif