Qt 4.2: graphwidget.h Example File (graphicsview/elasticnodes/graphwidget.h)

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# graphwidget.h Example File
graphicsview/elasticnodes/graphwidget.h

     /****************************************************************************
     **
     ** Copyright (C) 2006-2006 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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     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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     ****************************************************************************/

     #ifndef GRAPHWIDGET_H
     #define GRAPHWIDGET_H

     #include <QtGui/QGraphicsView>

     class Node;

     class GraphWidget : public QGraphicsView
     {
         Q_OBJECT

     public:
         GraphWidget();

         void itemMoved();

     protected:
         void keyPressEvent(QKeyEvent *event);
         void timerEvent(QTimerEvent *event);
         void wheelEvent(QWheelEvent *event);
         void drawBackground(QPainter *painter, const QRectF &rect);

         void scaleView(qreal scaleFactor);

     private:
         int timerId;
         Node *centerNode;
     };

     #endif