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** This file is part of the example classes of the Qt Toolkit.
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#ifndef GRAPHWIDGET_H
#define GRAPHWIDGET_H

#include <map>
#include <QGraphicsView>
#include <stdint.h>

class Node;
class Edge;

class GraphWidget : public QGraphicsView
{
    Q_OBJECT

public:
    GraphWidget(QWidget * = NULL);

	 typedef int NodeId ;
	 typedef int EdgeId ;

	 typedef enum  {
		 	ELASTIC_NODE_TYPE_OWN				= 0x0000,
			ELASTIC_NODE_TYPE_FRIEND 			= 0x0001,
			ELASTIC_NODE_TYPE_F_OF_F 			= 0x0002,
			ELASTIC_NODE_TYPE_UNKNOWN			= 0x0003
	 } NodeType ;

	 typedef enum {
			ELASTIC_NODE_AUTH_FULL			= 0x0000,
			ELASTIC_NODE_AUTH_MARGINAL		= 0x0001,
			ELASTIC_NODE_AUTH_UNKNOWN		= 0x0002
	 } AuthType ;

	 NodeId addNode(const std::string& NodeShortText,const std::string& nodeCompleteText,NodeType type,AuthType auth,const std::string& ssl_id,const std::string& gpg_id) ;
	 EdgeId addEdge(NodeId n1,NodeId n2) ;

	 void snapshotNodesPositions() ;
	 void clearNodesPositions() ;
	 void clearGraph() ;

	void setFreeze(bool freeze);
	bool isFrozen() const;

    virtual void itemMoved();

	 void setEdgeLength(uint32_t l) ;
	 uint32_t edgeLength() const { return _edge_length ; }

	 void forceRedraw() ;
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;
	 bool mDeterminedBB ;
	bool mIsFrozen;

	 std::vector<Node *> _nodes ;
	 std::map<std::pair<NodeId,NodeId>,Edge *> _edges ;
	 std::map<std::string,QPointF> _node_cached_positions ;

	 uint32_t _edge_length ;
	 float _friction_factor ;
	 NodeId _current_node ;
};

#endif
