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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.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #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