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

 #ifndef GRAPH_DISPLAYER_CANVAS_H

 #define GRAPH_DISPLAYER_CANVAS_H

 class GraphDisplayerCanvas;

 #include "all_include.h"

 #include "nbtab.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

 {

   friend class BrokenEdge;

   ///Edge displayer class

   ///This class is responsible for displaying edges in graph.

   ///The displayed edge is broken in the middle. The

   ///aim of this is to be able to indicate direction of edges

   ///and to be able to display more then one edges between the

   ///same source and target

   class BrokenEdge : public Gnome::Canvas::Line

   {

     ///The edge that the class displays.

     ///It is needed, because some datas needed from

     ///graph can be accessed by this or should be sent

     ///as parameter, but it would be complicated

     Edge edge;

     ///Reference to the canvas, on which the graph is drawn.

     ///It is needed, because some datas needed from

     ///graph can be accessed by this or should be sent

     ///as parameter, but it would be complicated

     GraphDisplayerCanvas & gdc;

     ///An arrow that indicates the direction of the edges

     ///in case of directional graph direction can be indicated

     ///by this polygon. The polygon formulates a red arrow.

     Gnome::Canvas::Polygon * arrow;

     ///Indicates whether the button of mouse is pressed or not at the moment.

     bool isbutton;

     ///At this location was the mousebutton pressed. Horizontal component.

     ///It helps to calculate the

     ///distance of dragging.

     double clicked_x;

     ///At this location was the mousebutton pressed. Vertical component.

     ///It helps to calculate the

     ///distance of dragging.

     double clicked_y;

     ///event handler for forming broken edges

     ///\param event the

     ///event to handle

     bool edgeFormerEventHandler(GdkEvent* event);

   public:

     ///Constructor of broken edge class.

     ///\param g the group to which the edge belongs

     ///\param _edge the represented edge

     ///\param gc the canvas

     BrokenEdge(Gnome::Canvas::Group & g, Edge _edge, GraphDisplayerCanvas & gc);

     ///Destructor of broken edge class

     ///Frees up

     ///reserved memory

     ~BrokenEdge();

     ///The function that draws the edge based on collected data

     void draw();

   };

   ///Type of canvas, on which the graph is drawn

   typedef Gnome::Canvas::CanvasAA Parent;

 public:

   ///Constructor

   ///\param nbt the tab of the window, in which the graph is displayed

   GraphDisplayerCanvas(NoteBookTab & nbt);

   ///destructor of the class

   virtual ~GraphDisplayerCanvas();

   ///Changes the width of edge(s) according to the given map.

   ///\param mapname is the name of the map which contains the values to be set

   ///\param edge if it is given, only the width of the given edge will be set, instead of all of them.

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

   ///Resets width of edge(s) to the default value

   ///\param edge if it is given, only the width of the

   ///given edge will be reset, instead of all of them.

   int resetEdgeWidth (Edge edge=INVALID);

   ///Changes the color of edge(s) according to the given map.

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

   ///\param edge if it is given, only the color of the given edge will be set, instead of all of them.

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

   ///Resets color of edge(s) to the default value

   ///\param edge if it is given, only the color of the

   ///given edge will be reset, instead of all of them.

   int resetEdgeColor (Edge edge=INVALID);

   ///Changes the label of edge(s) according to the given map.

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

   ///\param edge if it is given, only the label of the given edge will be set, instead of all of them.

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

   ///Resets label of edge(s) to the default value

   ///\param edge if it is given, only the color of the

   ///given edge will be reset, instead of all of them.

   int resetEdgeText (Edge edge=INVALID);

   ///Changes the radius of node(s) according to the given map.

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

   ///\param node if it is given, only the radius of the given node will be set, instead of all of them.

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

   ///Resets radius of node(s) to the default value

   ///\param node if it is given, only the radius of the

   ///given node will be reset, instead of all of them.

   int resetNodeRadius (Node node=INVALID);

   ///Changes the color of node(s) according to the given map.

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

   ///\param node if it is given, only the color of the given node will be set, instead of all of them.

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

   ///Resets color of node(s) to the default value

   ///\param node if it is given, only the color of the

   ///given node will be reset, instead of all of them.

   int resetNodeColor (Node node=INVALID);

   ///Changes the label of node(s) according to the given map.

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

   ///\param node if it is given, only the label of the given node will be set, instead of all of them.

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

   ///Resets label of node(s) to the default value

   ///\param node if it is given, only the label of the

   ///given node will be reset, instead of all of them.

   int resetNodeText (Node node=INVALID);

   ///This function is called, when any of the displayed attributes have to be updated, or changed

   ///\param itisedge if true, edge property has to be changed, else node property

   ///\param prop the id of property that has to changed or updated

   void propertyChange(bool itisedge, int prop);

   ///updates the given property

   ///\param edge if it is not INVALID, only the property of the given edge will be updated, instead of all of them

   ///\param prop the property to update

   void propertyUpdate(Edge edge, int prop);

   ///updates the given property

   ///\param node if it is not INVALID, only the property of the given node will be updated, instead of all of them

   ///\param prop the property to update

   void propertyUpdate(Node node, int prop);

   ///updates all the property for the given edge

   void propertyUpdate(Edge);

   ///updates all the property for the given node

   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 necessary elements on the canvas,

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

   ///redrawn (\ref textReposition).

   void toggleEdgeActivity(BrokenEdge*, bool);

 public:

   ///Returns the actual tool in hand

   int getActualTool();

   ///draws the graph

   ///Called when opening a file.

   void drawGraph();

   ///Clears the canvas

   ///It achieves this by deleting all data

   ///structure used to help handle the displayed graph.

   void clear();

   ///creates a new Nodemap

   ///\param init initial value of the map

   ///\param mapname name of new map

   int addNewNodeMap(double init,std::string mapname);

   ///creates a new Edgemap

   ///\param init initial value of the map

   ///\param mapname name of new map

   int addNewEdgeMap(double init,std::string mapname);

 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, to work on it after selection

   Gnome::Canvas::Item * active_item;

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

   ///this variable is used at edge creation, it will

   ///be the secondly selected node. No local variable

   ///can be used for this purpose inside the function,

   ///because the node selected by button press, and

   ///the edge is created by button release. Both of

   ///them is different function call.

   Gnome::Canvas::Item * target_item;

   ///selected node (for any editing)

   Node active_node;

   ///selected edge (for any editing)

   Edge active_edge;

   ///the edge that is selected by clicking on the red arrow in the middle of it

   ///This edge is stored only for the purpose of reshape it.

   ///That is why it is selected in a different manner.

   Edge forming_edge;

   ///Map displayed by label can be edited.

   std::string nodemap_to_edit;

   ///Map displayed by label can be edited.

   std::string edgemap_to_edit;

   static const int zoom_step = 5;

 private:

   ///reference to the container, in which the canvas is

   NoteBookTab & mytab;

   XY GraphDisplayerCanvas::calcArrowPos(XY, XY, XY, XY, bool);

 };

 #endif //GRAPH_DISPLAYER_CANVAS_H