// -*- C++ -*- //

#ifndef GRAPH_DISPLAYER_CANVAS_H

#define GRAPH_DISPLAYER_CANVAS_H

class GraphDisplayerCanvas;

#include "all_include.h"

#include "main_win.h"

#include <libgnomecanvasmm.h>

#include <libgnomecanvasmm/polygon.h>

#include <lemon/xy.h>

///This class is the canvas, on which the graph can be drawn.

class GraphDisplayerCanvas : public Gnome::Canvas::CanvasAA

{

  class BrokenEdge : public Gnome::Canvas::Line

  {

    GraphDisplayerCanvas & gdc;

    Gnome::Canvas::Polygon * arrow;

    Gnome::Art::Point * my_points;

    ///Indicates whether the button of mouse is pressed or not

    bool isbutton;

    ///At this location was the mousebutton pressed.

    ///It helps to calculate the distance of dragging.

    double clicked_x, clicked_y;

    ///event handler for forming edges

    bool edgeFormerEventHandler(GdkEvent*);

  public:

    BrokenEdge(Gnome::Canvas::Group &, Gnome::Canvas::Points, GraphDisplayerCanvas &);

    ~BrokenEdge();

    void setPoints(Gnome::Canvas::Points, bool move=false);

    xy<double> getArrowPos();

  };

  typedef Gnome::Canvas::CanvasAA Parent;

public:

  GraphDisplayerCanvas(MainWin &);

  virtual ~GraphDisplayerCanvas();

  ///Changes the linewidth attribute according to the given map.

  ///\param mapname is the name of the map which contains the new values

  int changeEdgeWidth (std::string mapname, Edge new_item=INVALID);

  int resetEdgeWidth (Edge new_item=INVALID);

  ///Changes the linecolor attribute according to the given map.

  ///\param mapname is the name of the map which contains the new values

  int changeEdgeColor (std::string mapname, Edge new_item=INVALID);

  int resetEdgeColor (Edge new_item=INVALID);

  ///Changes the text of line attribute according to the given map.

  ///\param mapname is the name of the map which contains the new values

  int changeEdgeText (std::string mapname, Edge new_item=INVALID);

  int resetEdgeText (Edge new_item=INVALID);

  ///Changes the linewidth attribute according to the given map.

  ///\param mapname is the name of the map which contains the new values

  int changeNodeRadius (std::string mapname, Node new_item=INVALID);

  int resetNodeRadius (Node new_item=INVALID);

  ///Changes the linecolor attribute according to the given map.

  ///\param mapname is the name of the map which contains the new values

  int changeNodeColor (std::string mapname, Node new_item=INVALID);

  int resetNodeColor (Node new_item=INVALID);

  ///Changes the text of line attribute according to the given map.

  ///\param mapname is the name of the map which contains the new values

  int changeNodeText (std::string mapname, Node new_item=INVALID);

  int resetNodeText (Node new_item=INVALID);

  void propertyChange(bool, int);

  void propertyUpdate(Edge, int, int dummy=0);

  void propertyUpdate(Node, int, int dummy=0);

  void propertyUpdate(Edge);

  void propertyUpdate(Node);

  ///Callback for 'ViewZoomIn' action.

  virtual void zoomIn();

  ///Callback for 'ViewZoomOut' action.

  virtual void zoomOut();

  ///Callback for 'ViewZoomFit' action.

  virtual void zoomFit();

  ///Callback for 'ViewZoom100' action.

  virtual void zoom100();

  ///Sets the scroll region of the convas to the bounding box of the graph.

  void updateScrollRegion();

  ///This function changes the tool in the graph-editor's hand

  void changeEditorialTool(int);

protected:

  //maximizing, minimizing, restoring window, etc. 

  virtual bool on_expose_event(GdkEventExpose *);

private:

  ///This function is responsible for the correct

  ///reaction of any action happened in the territory

  ///of the canvas

  ///DEPRECATED!!!!

  bool eventHandler(GdkEvent* e, Node n);

  ///actual event handler

  ///

  ///Actual event handler should be stored, to be able to disconnect it and later reconnect it.

  sigc::connection actual_handler;

  ///event handler for the case when move-tool is active

  bool moveEventHandler(GdkEvent*);

  ///event handler for the case when create_node-tool is active

  bool createNodeEventHandler(GdkEvent*);

  ///event handler for the case when create_edge-tool is active

  bool createEdgeEventHandler(GdkEvent*);

  ///event handler for the case when eraser-tool is active

  bool eraserEventHandler(GdkEvent*);

  ///event handler for the case when edge map editor tool is active

  bool edgeMapEditEventHandler(GdkEvent*);

  ///event handler for the case when node map editor tool is active

  bool nodeMapEditEventHandler(GdkEvent*);

public:

  ///Moves the text to new place

  void textReposition(xy<double>);

  ///Activates an edge belonging to a BrokenEdge

  ///

  ///After we have activated an edge this way,

  ///the GDC object will know, which edge is under forming

  ///therefore it can redraw the necessarz elementy on the canvas,

  ///for example the text belonging to the \ref BrokenEdge can be

  ///redrawn (\ref textReposition).

  void toggleEdgeActivity(BrokenEdge*, bool);

public:

  ///\return the actual tool in hand

  int getActualTool();

  void drawGraph();

  void clear();

  ///creates a new Nodemap

  int addNewNodeMap(double,std::string);

  ///creates a new Edgemap

  int addNewEdgeMap(double,std::string);

private:

  ///Deletes the given element.

  void deleteItem(Node);

  ///Deletes the given element.

  void deleteItem(Edge);

private:

  ///Map of nodes of graph

  Graph::NodeMap<Gnome::Canvas::Ellipse *> nodesmap;

  ///Map of edges of graph

  Graph::EdgeMap<BrokenEdge *> edgesmap;

  ///Map of texts to write on edges

  Graph::EdgeMap<Gnome::Canvas::Text *> edgetextmap;

  ///Map of texts to write on nodes

  Graph::NodeMap<Gnome::Canvas::Text *> nodetextmap;

  ///Group of graphical elements of displayed_graph

  Gnome::Canvas::Group displayed_graph;

private:

  ///Indicates whether the button of mouse is pressed or not

  int isbutton;

  ///Stores the actual tool in hand

  int actual_tool;

  ///At this location was the mousebutton pressed.

  ///It helps to calculate the distance of dragging.

  double clicked_x, clicked_y;

  ///Remembers which Gnome::Canvas::Item was pressed.

  ///this variable is needed, because

  ///1. we cannot query the item at he cursor as fast as it could not cause a Segmentation Fault

  ///2. we would like to handle only ony item per movement, therefore quering it is not a working solution

  Gnome::Canvas::Item * active_item, * target_item;

  Node active_node;

  Edge active_edge;

  Edge forming_edge;

  std::string nodemap_to_edit, edgemap_to_edit;

  static const int zoom_step = 5;

private:

  ///reference to the parent window

  MainWin & mainwin;

};

#endif //GRAPH_DISPLAYER_CANVAS_H