/***************************************************************

QGVCore

Copyright (c) 2014, Bergont Nicolas, All rights reserved.

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 3.0 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library.

***************************************************************/

#ifndef QGVEDGE_H

#define QGVEDGE_H

#include <QGraphicsItem>

#include <QPen>

#include "qgv.h"

class QGVNode;

class QGVScene;

class QGVEdgePrivate;

/**

 * @brief Edge item

 *

 */

class QGVCORE_EXPORT QGVEdge : public QGraphicsItem {

 public:

  ~QGVEdge();

  QString label() const;

  QRectF boundingRect() const;

  QPainterPath shape() const;

  void setLabel(const QString &label);

  void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,

             QWidget *widget = 0);

  void setAttribute(const QString &name, const QString &value);

  QString getAttribute(const QString &name) const;

  void updateLayout();

  enum { Type = UserType + 3 };

 private:

  QGVEdge(QGVEdgePrivate *edge, QGVScene *scene);

  QPolygonF toArrow(const QLineF &normal) const;

  friend class QGVScene;

  // friend class QGVSubGraph;

  QGVScene *_scene;

  QGVEdgePrivate *_edge;

  QPainterPath _path;

  QPen _pen;

  QPolygonF _head_arrow;

  QPolygonF _tail_arrow;

  QString _label;

  QRectF _label_rect;

};

#endif  // QGVEDGE_H