// -*- 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