qcontext2dcanvas.h Example File

 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation ([email protected])
 **
 ** 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:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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