QGVEdge.h

Go to the documentation of this file.

/***************************************************************
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;

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 };
  int type() const { return Type; }
 
 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