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// Copyright (c) 2008  GeometryFactory Sarl (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// You can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
// 
//
// Author(s)     : Andreas Fabri <Andreas.Fabri@geometryfactory.com>
//                 Laurent Rineau <Laurent.Rineau@geometryfactory.com>

#ifndef CGAL_QT_GRAPHICS_VIEW_NAVIGATION_H
#define CGAL_QT_GRAPHICS_VIEW_NAVIGATION_H

#include <CGAL/auto_link/Qt4.h>
#include <CGAL/export/Qt4.h>
#include <QObject>
#include <QPointF>
#include <QString>
#include <QCursor>
#include <QRect>
#include <QRectF>

class QGraphicsView;
class QGraphicsScene;
class QEvent;
class QGraphicsRectItem;

namespace CGAL {
namespace Qt {

class CGAL_QT4_EXPORT GraphicsViewNavigation: public QObject {

  Q_OBJECT

  signals:
  void mouseCoordinates(QString);

public:
  GraphicsViewNavigation();
  ~GraphicsViewNavigation();
  
  bool eventFilter(QObject *obj, QEvent *event);

private:

  void scaleView(QGraphicsView*, qreal scaleFactor);
  void translateView(QGraphicsView*, int dx,  int dy);
  void drag_to(QGraphicsView*, QPoint new_pos);
  void display_parameters(QGraphicsView*);

  QGraphicsRectItem* rectItem;
  QPointF rect_first_point;
  bool dragging;
  QPointF dragging_start;
  QCursor cursor_backup;
};

} // namespace Qt
} // namespace CGAL

#endif // CGAL_QT_GRAPHICS_VIEW_NAVIGATION_H