#include "graph_displayer_canvas.h"

 #include "broken_edge.h"

 #include <cmath>

 bool GraphDisplayerCanvas::on_expose_event(GdkEventExpose *event)

 {

   Gnome::Canvas::CanvasAA::on_expose_event(event);

   //usleep(10000);

   //rezoom();

   return true;

 }

 void GraphDisplayerCanvas::changeEditorialTool(int newtool)

 {

   if(actual_tool!=newtool)

     {

       actual_handler.disconnect();

       switch(actual_tool)

 	{

 	case CREATE_EDGE:

 	  {

 	    GdkEvent * generated=new GdkEvent();

 	    generated->type=GDK_BUTTON_RELEASE;

 	    generated->button.button=3;

 	    createEdgeEventHandler(generated);      

 	    break;

 	  }

 	case EDGE_MAP_EDIT:

 	  //has to do the same thing as in the case of NODE_MAP_EDIT

 	case NODE_MAP_EDIT:

 	  {

 	    GdkEvent * generated=new GdkEvent();

 	    generated->type=GDK_KEY_PRESS;

 	    ((GdkEventKey*)generated)->keyval=GDK_KP_Enter;

 	    entryWidgetChangeHandler(generated);

 	    entrywidget.hide();

 	    break;

 	  }

 	default:

 	  break;

 	}

       active_item=NULL; 

       target_item=NULL; 

       active_edge=INVALID;	

       active_node=INVALID;	

       actual_tool=newtool;

       switch(newtool)

 	{

 	case MOVE:

 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::moveEventHandler), false);

 	  break;

 	case CREATE_NODE:

 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::createNodeEventHandler), false);

 	  break;

 	case CREATE_EDGE:

 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::createEdgeEventHandler), false);

 	  break;

 	case ERASER:

 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::eraserEventHandler), false);

 	  break;

 	case EDGE_MAP_EDIT:

 	  grab_focus();

 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::edgeMapEditEventHandler), false);

 	  break;

 	case NODE_MAP_EDIT:

 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::nodeMapEditEventHandler), false);

 	  break;

 	default:

 	  break;

 	}

     }

 }

 int GraphDisplayerCanvas::getActualTool()

 {

   return actual_tool;

 }

 bool GraphDisplayerCanvas::moveEventHandler(GdkEvent* e)

 {

   switch(e->type)

   {

     case GDK_BUTTON_PRESS:

       //we mark the location of the event to be able to calculate parameters of dragging

       window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);

       active_item=(get_item_at(clicked_x, clicked_y));

       active_node=INVALID;

       for (NodeIt i(mapstorage.graph); i!=INVALID; ++i)

 	{

 	  if(nodesmap[i]==active_item)

 	    {

 	      active_node=i;

 	    }

 	}

       switch(e->button.button)

 	{

 	case 3:      

 	  isbutton=3;

 	  break;

 	default:

 	  isbutton=1;

 	  break;

 	}

       break;

     case GDK_BUTTON_RELEASE:

       isbutton=0;

       active_item=NULL;

       active_node=INVALID;

       break;

     case GDK_MOTION_NOTIFY:

       //we only have to do sg. if the mouse button is pressed AND the click was on a node that was found in the set of nodes

       if(active_node!=INVALID)

       {

         mapstorage.modified = true;

         mapstorage.coords.set(active_node, xy<double>(clicked_x, clicked_y));

 	//new coordinates will be the old values,

 	//because the item will be moved to the

 	//new coordinate therefore the new movement

 	//has to be calculated from here

 	double new_x, new_y;

 	window_to_world (e->motion.x, e->motion.y, new_x, new_y);

         double dx=new_x-clicked_x;

         double dy=new_y-clicked_y;

 	//repositioning node and its text

         active_item->move(dx, dy);

 	nodetextmap[active_node]->move(dx, dy);

         clicked_x=new_x;

         clicked_y=new_y;

 	//all the edges connected to the moved point has to be redrawn

         EdgeIt ei;

         mapstorage.graph.firstOut(ei,active_node);

         for(;ei!=INVALID;mapstorage.graph.nextOut(ei))

         {

             Gnome::Canvas::Points coos;

             double x1, x2, y1, y2;

             nodesmap[mapstorage.graph.source(ei)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             nodesmap[mapstorage.graph.target(ei)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

 	    if(isbutton==3)

 	      {

 		edgesmap[ei]->setPoints(coos);

 	      }

 	    else

 	      {

 		edgesmap[ei]->setPoints(coos,true);

 	      }

 	    //reposition of edgetext

 	    xy<double> text_pos=edgesmap[ei]->getArrowPos();

 	    text_pos+=(xy<double>(10,10));

 	    edgetextmap[ei]->property_x().set_value(text_pos.x);

 	    edgetextmap[ei]->property_y().set_value(text_pos.y);

         }

         mapstorage.graph.firstIn(ei,active_node);

         for(;ei!=INVALID;mapstorage.graph.nextIn(ei))

         {

             Gnome::Canvas::Points coos;

             double x1, x2, y1, y2;

             nodesmap[mapstorage.graph.source(ei)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             nodesmap[mapstorage.graph.target(ei)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

 	    if(isbutton==3)

 	      {

 		edgesmap[ei]->setPoints(coos);

 	      }

 	    else

 	      {

 		edgesmap[ei]->setPoints(coos,true);

 	      }

 	    xy<double> text_pos=edgesmap[ei]->getArrowPos();

 	    text_pos+=(xy<double>(10,10));

 	    edgetextmap[ei]->property_x().set_value(text_pos.x);

 	    edgetextmap[ei]->property_y().set_value(text_pos.y);

         }

       }

     default: break;

   }

   return false;

 }

 bool GraphDisplayerCanvas::createNodeEventHandler(GdkEvent* e)

 {

   switch(e->type)

   {

     //move the new node

     case GDK_MOTION_NOTIFY:

       {

         GdkEvent * generated=new GdkEvent();

         generated->motion.x=e->motion.x;

         generated->motion.y=e->motion.y;

         generated->type=GDK_MOTION_NOTIFY;

         moveEventHandler(generated);      

         break;

       }

     case GDK_BUTTON_RELEASE:

       mapstorage.modified = true;

       isbutton=1;

       active_node=mapstorage.graph.addNode();

       //initiating values corresponding to new node in maps

       window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);

       // update coordinates

       mapstorage.coords.set(active_node, xy<double>(clicked_x, clicked_y));

       // update id map

       (*mapstorage.nodemap_storage["id"])[active_node] =

         mapstorage.graph.id(active_node);

       // update all other maps

       for (std::map<std::string, Graph::NodeMap<double>*>::const_iterator it =

           mapstorage.nodemap_storage.begin(); it !=

           mapstorage.nodemap_storage.end(); ++it)

       {

         if ((it->first != "id") &&

             (it->first != "coordinates_x") &&

             (it->first != "coordiantes_y"))

         {

           (*(it->second))[active_node] =

             mapstorage.nodemap_default[it->first];

         }

       }

       nodesmap[active_node]=new Gnome::Canvas::Ellipse(displayed_graph,

           clicked_x-20, clicked_y-20, clicked_x+20, clicked_y+20);

       active_item=(Gnome::Canvas::Item *)(nodesmap[active_node]);

       *(nodesmap[active_node]) <<

         Gnome::Canvas::Properties::fill_color("blue");

       *(nodesmap[active_node]) <<

         Gnome::Canvas::Properties::outline_color("black");

       active_item->raise_to_top();

       (nodesmap[active_node])->show();

       nodetextmap[active_node]=new Gnome::Canvas::Text(displayed_graph,

           clicked_x+node_property_defaults[N_RADIUS]+5,

           clicked_y+node_property_defaults[N_RADIUS]+5, "");

       nodetextmap[active_node]->property_fill_color().set_value("darkblue");

       nodetextmap[active_node]->raise_to_top();

       mapwin.updateNode(active_node);

       isbutton=0;

       target_item=NULL;

       active_item=NULL;

       active_node=INVALID;

       break;

     default:

       break;

   }

   return false;

 }

 bool GraphDisplayerCanvas::createEdgeEventHandler(GdkEvent* e)

 {

   switch(e->type)

   {

     case GDK_BUTTON_PRESS:

       //in edge creation right button has special meaning

       if(e->button.button!=3)

       {

         //there is not yet selected node

         if(active_node==INVALID)

         {

           //we mark the location of the event to be able to calculate parameters of dragging

           window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);

           active_item=(get_item_at(clicked_x, clicked_y));

           active_node=INVALID;

           for (NodeIt i(mapstorage.graph); i!=INVALID; ++i)

           {

             if(nodesmap[i]==active_item)

             {

               active_node=i;

             }

           }

           //the clicked item is really a node

           if(active_node!=INVALID)

           {

             *(nodesmap[active_node]) << Gnome::Canvas::Properties::fill_color("red");

             isbutton=1;

           }

           //clicked item was not a node. It could be e.g. edge.

           else

           {

             active_item=NULL;

           }

         }

         //we only have to do sg. if the mouse button

         // is pressed already once AND the click was

         // on a node that was found in the set of 

         //nodes, and now we only search for the second 

         //node

         else

         {

           window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);

           target_item=(get_item_at(clicked_x, clicked_y));

           Node target_node=INVALID;

           for (NodeIt i(mapstorage.graph); i!=INVALID; ++i)

           {

             if(nodesmap[i]==target_item)

             {

               target_node=i;

             }

           }

           //the clicked item is a node, the edge can be drawn

           if(target_node!=INVALID)

           {

             if(target_node!=active_node)		

             {

               mapstorage.modified = true;

               *(nodesmap[target_node]) <<

                 Gnome::Canvas::Properties::fill_color("red");

               //creating new edge

               active_edge=mapstorage.graph.addEdge(active_node,

                   target_node);

               // update id map

               (*mapstorage.edgemap_storage["id"])[active_edge] = 

                 mapstorage.graph.id(active_edge);

               // update all other maps

               for (std::map<std::string,

                   Graph::EdgeMap<double>*>::const_iterator it =

                   mapstorage.edgemap_storage.begin(); it !=

                   mapstorage.edgemap_storage.end(); ++it)

               {

                 if (it->first != "id")

                 {

                   (*(it->second))[active_edge] =

                     mapstorage.edgemap_default[it->first];

                 }

               }

               //calculating coordinates of new edge

               Gnome::Canvas::Points coos;

               double x1, x2, y1, y2;

               active_item->get_bounds(x1, y1, x2, y2);

               coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

               target_item->get_bounds(x1, y1, x2, y2);

               coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

               //drawing new edge

               edgesmap[active_edge]=new BrokenEdge(displayed_graph, coos,

                   *this);

               *(edgesmap[active_edge]) <<

                 Gnome::Canvas::Properties::fill_color("green");

               edgesmap[active_edge]->property_width_pixels().set_value(10);

               edgesmap[active_edge]->lower_to_bottom();

               //initializing edge-text as well, to empty string

               xy<double> text_pos=edgesmap[active_edge]->getArrowPos();

               text_pos+=(xy<double>(10,10));

               edgetextmap[active_edge]=new Gnome::Canvas::Text(displayed_graph,

                   text_pos.x, text_pos.y, "");

               edgetextmap[active_edge]->property_fill_color().set_value(

                   "darkgreen");

               edgetextmap[active_edge]->raise_to_top();

               //updating its properties

               mapwin.updateEdge(active_edge);

             }

             else

             {

               target_node=INVALID;

               std::cerr << "Loop edge is not yet implemented!" << std::endl;

             }

           }

           //clicked item was not a node. it could be an e.g. edge. we do not

           //deal with it furthermore.

           else

           {

             target_item=NULL;

           }

         }

       }

       break;

     case GDK_BUTTON_RELEASE:

       isbutton=0;

       //we clear settings in two cases

       //1: the edge is ready (target_item has valid value)

       //2: the edge creation is cancelled with right button

       if((target_item)||(e->button.button==3))

       {

         if(active_item)

         {

           *active_item << Gnome::Canvas::Properties::fill_color("blue");

           active_item=NULL;

         }

         if(target_item)

         {

           *target_item << Gnome::Canvas::Properties::fill_color("blue");

           target_item=NULL;

         }

         active_node=INVALID;

         active_edge=INVALID;

       }

       break;

     default:

       break;

   }

   return false;

 }

 bool GraphDisplayerCanvas::eraserEventHandler(GdkEvent* e)

 {

   switch(e->type)

     {

     case GDK_BUTTON_PRESS:

       //finding the clicked items

       window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);

       active_item=(get_item_at(clicked_x, clicked_y));

       active_node=INVALID;

       active_edge=INVALID;

       //was it a node?

       for (NodeIt i(mapstorage.graph); i!=INVALID; ++i)

 	{

 	  if(nodesmap[i]==active_item)

 	    {

 	      active_node=i;

 	    }

 	}

       //or was it an edge?

       if(active_node==INVALID)

 	{

 	  for (EdgeIt i(mapstorage.graph); i!=INVALID; ++i)

 	    {

 	      if(edgesmap[i]==active_item)

 		{

 		  active_edge=i;

 		}

 	    }

 	}

       //recolor activated item

       if(active_item)

 	{

 	  *active_item << Gnome::Canvas::Properties::fill_color("red");

 	}

       break;

     case GDK_BUTTON_RELEASE:

       window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);

       if(active_item)

 	{

 	  //the cursor was not moved since pressing it

 	  if( active_item == ( get_item_at (clicked_x, clicked_y) ) )

 	    {

 	      //a node was found

 	      if(active_node!=INVALID)

 		{

                   mapstorage.modified = true;

 		  //collecting edges to delete

 		  EdgeIt e;

 		  std::set<Graph::Edge> edges_to_delete;

 		  mapstorage.graph.firstOut(e,active_node);

 		  for(;e!=INVALID;mapstorage.graph.nextOut(e))

 		    {

 		      edges_to_delete.insert(e);

 		    }

 		  mapstorage.graph.firstIn(e,active_node);

 		  for(;e!=INVALID;mapstorage.graph.nextIn(e))

 		    {

 		      edges_to_delete.insert(e);

 		    }

 		  //deleting collected edges

 		  for(std::set<Graph::Edge>::iterator edge_set_it=edges_to_delete.begin();edge_set_it!=edges_to_delete.end();edge_set_it++)

 		    {

 		      deleteItem(*edge_set_it);

 		    }

 		  deleteItem(active_node);

 		}

 	      //a simple edge was chosen

 	      else

 		{

 		  deleteItem(active_edge);

 		}

 	    }

 	  //pointer was moved, deletion is cancelled

 	  else

 	    {

 	      if(active_node!=INVALID)

 		{

 		  *active_item << Gnome::Canvas::Properties::fill_color("blue");

 		}

 	      else

 		{

 		  *active_item << Gnome::Canvas::Properties::fill_color("green");

 		}

 	    }

 	}

       //reseting datas

       active_item=NULL;

       active_edge=INVALID;

       active_node=INVALID;

       break;

     case GDK_MOTION_NOTIFY:

       break;

     default:

       break;

     }

   return false;

 }

 bool GraphDisplayerCanvas::edgeMapEditEventHandler(GdkEvent* e)

 {

   if(actual_tool==EDGE_MAP_EDIT)

     {

       switch(e->type)

 	{

 	case GDK_KEY_PRESS:

 	  //for Escape or Enter hide the displayed widget

 	  {

 	    nodeMapEditEventHandler(e);

 	    break;

 	  }

 	case GDK_BUTTON_PRESS:

 	  //If the click happened on an edge we place the entrywidget there and fill in the value of the activated map at that edge.

 	  {

 	    //for determine, whether it was an edge

 	    Edge clicked_edge=INVALID;

 	    //find the activated item between texts

 	    active_item=(get_item_at(e->button.x, e->button.y));

 	    for (EdgeIt i(mapstorage.graph); i!=INVALID; ++i)

 	      {

 		if(edgetextmap[i]==active_item)

 		  {

 		    clicked_edge=i;

 		  }

 	      }

 	    //if it was not between texts, search for it between edges

 	    if(clicked_edge==INVALID)

 	      {

 		window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);

 		active_item=(get_item_at(clicked_x, clicked_y));

 		for (EdgeIt i(mapstorage.graph); i!=INVALID; ++i)

 		  {

 		    //at the same time only one can be active

 		    if((edgesmap[i]==active_item)||(edgetextmap[i]==active_item))

 		      {

 			clicked_edge=i;

 		      }

 		  }

 	      }

 	    //if it was really an edge...

 	    if(clicked_edge!=INVALID)

 	      {

                 // the id map is not editable

                 if (nodemap_to_edit == "id") return 0;

 		//If there is already edited edge, it has to be saved first

 		if(entrywidget.is_visible())

 		  {

 		    GdkEvent * generated=new GdkEvent();

 		    generated->type=GDK_KEY_PRESS;

 		    ((GdkEventKey*)generated)->keyval=GDK_KP_Enter;

 		    entryWidgetChangeHandler(generated);

 		  }

 		//If the previous value could be saved, we can go further, otherwise not

 		if(!entrywidget.is_visible())

 		  {

 		    //and there is activated map

 		    if(edgetextmap[clicked_edge]->property_text().get_value()!="")

 		      {

 			//activate the general variable for it

 			active_edge=clicked_edge;

 			//delete visible widget if there is

 			if(canvasentrywidget)

 			  {

 			    delete(canvasentrywidget);

 			  }

 			//initialize the entry

 			entrywidget.show();

 			//fill in the correct value

 			entrywidget.set_text(edgetextmap[active_edge]->property_text().get_value());

 			//replace and resize the entry to the activated edge and put it in a Canvas::Widget to be able to display it on gdc

 			xy<double> entry_coos;

 			entry_coos.x=(edgetextmap[active_edge])->property_x().get_value();

 			entry_coos.x-=edgetextmap[active_edge]->property_text_width().get_value()/2;

 			entry_coos.y=(edgetextmap[active_edge])->property_y().get_value();

 			entry_coos.y-=edgetextmap[active_edge]->property_text_height().get_value()*1.5/2;

 			canvasentrywidget=new Gnome::Canvas::Widget(displayed_graph, entry_coos.x, entry_coos.y, entrywidget);

 			canvasentrywidget->property_width().set_value(edgetextmap[active_edge]->property_text_width().get_value()*4);

 			canvasentrywidget->property_height().set_value(edgetextmap[active_edge]->property_text_height().get_value()*1.5);

 			//setting the focus to newly created widget

 			parentwin->set_focus(entrywidget);

 			parentwin->activate_focus();

 		      }

 		  }

 	      }

 	    //if it was not an edge...

 	    else

 	      {

 		//In this case the click did not happen on an edge

 		//if there is visible entry we save the value in it

 		//we pretend like an Enter was presse din the Entry widget

 		GdkEvent * generated=new GdkEvent();

 		generated->type=GDK_KEY_PRESS;

 		((GdkEventKey*)generated)->keyval=GDK_KP_Enter;

 		entryWidgetChangeHandler(generated);

 	      }

 	    break;

 	  }

 	default:

 	  break;

 	}

     }

   return false;  

 }

 bool GraphDisplayerCanvas::nodeMapEditEventHandler(GdkEvent* e)

 {

   if(actual_tool==NODE_MAP_EDIT)

     {

       switch(e->type)

 	{

 	case GDK_KEY_PRESS:

 	  //for Escape or Enter hide the displayed widget

 	  {

 	    switch(((GdkEventKey*)e)->keyval)

 	      {

 	      case GDK_Escape:

 		entrywidget.hide();

 		break;

 	      case GDK_Return:

 	      case GDK_KP_Enter:

 		entrywidget.hide();

 		break;

 	      default:

 		break;

 	      }

 	    break;

 	  }

 	case GDK_BUTTON_PRESS:

 	  //If the click happened on an edge we place the entrywidget there and fill in the value of the activated map at that edge.

 	  {

 	    //for determine, whether it was a node

 	    Node clicked_node=INVALID;

 	    //find the activated item between texts

 	    active_item=(get_item_at(e->button.x, e->button.y));

 	    for (NodeIt i(mapstorage.graph); i!=INVALID; ++i)

 	      {

 		//at the same time only one can be active

 		if(nodetextmap[i]==active_item)

 		  {

 		    clicked_node=i;

 		  }

 	      }

 	    //if there was not, search for it between nodes

 	    if(clicked_node==INVALID)

 	      {

 		window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);

 		active_item=(get_item_at(clicked_x, clicked_y));

 		for (NodeIt i(mapstorage.graph); i!=INVALID; ++i)

 		  {

 		    //at the same time only one can be active

 		    if(nodesmap[i]==active_item)

 		      {

 			clicked_node=i;

 		      }

 		  }

 	      }

 	    //if it was really an edge...

 	    if(clicked_node!=INVALID)

 	      {

                 // the id map is not editable

                 if (nodemap_to_edit == "id") return 0;

 		//If there is already edited edge, it has to be saved first

 		if(entrywidget.is_visible())

 		  {

 		    GdkEvent * generated=new GdkEvent();

 		    generated->type=GDK_KEY_PRESS;

 		    ((GdkEventKey*)generated)->keyval=GDK_KP_Enter;

 		    entryWidgetChangeHandler(generated);

 		  }

 		//If the previous value could be saved, we can go further, otherwise not

 		if(!entrywidget.is_visible())

 		  {

 		    //and there is activated map

 		    if(nodetextmap[clicked_node]->property_text().get_value()!="")

 		      {

 			//activate the general variable for it

 			active_node=clicked_node;

 			//delete visible widget if there is

 			if(canvasentrywidget)

 			  {

 			    delete(canvasentrywidget);

 			  }

 			//initialize the entry

 			entrywidget.show();

 			//fill in the correct value

 			entrywidget.set_text(nodetextmap[active_node]->property_text().get_value());

 			//replace and resize the entry to the activated node and put it in a Canvas::Widget to be able to display it on gdc

 			xy<double> entry_coos;

 			entry_coos.x=(nodetextmap[active_node])->property_x().get_value();

 			entry_coos.x-=nodetextmap[active_node]->property_text_width().get_value()/2;

 			entry_coos.y=(nodetextmap[active_node])->property_y().get_value();

 			entry_coos.y-=nodetextmap[active_node]->property_text_height().get_value()*1.5/2;

 			canvasentrywidget=new Gnome::Canvas::Widget(displayed_graph, entry_coos.x, entry_coos.y, entrywidget);

 			canvasentrywidget->property_width().set_value(nodetextmap[active_node]->property_text_width().get_value()*4);

 			canvasentrywidget->property_height().set_value(nodetextmap[active_node]->property_text_height().get_value()*1.5);

 		      }

 		  }

 	      }

 	    //if it was not an edge...

 	    else

 	      {

 		//In this case the click did not happen on an edge

 		//if there is visible entry we save the value in it

 		//we pretend like an Enter was presse din the Entry widget

 		GdkEvent * generated=new GdkEvent();

 		generated->type=GDK_KEY_PRESS;

 		((GdkEventKey*)generated)->keyval=GDK_KP_Enter;

 		entryWidgetChangeHandler(generated);

 	      }

 	    break;

 	  }

 	default:

 	  break;

 	}

     }

   return false;  

 }

 bool GraphDisplayerCanvas::entryWidgetChangeHandler(GdkEvent* e)

 {

   if(entrywidget.is_visible())

     {

       if(e->type==GDK_KEY_PRESS)

 	{

 	  switch(((GdkEventKey*)e)->keyval)

 	    {

 	    case GDK_Escape:

 	      entrywidget.hide();

 	      break;

 	    case GDK_KP_Enter:

 	    case GDK_Return:

 	      {

 		//these variables check whether the text in the entry is valid

 		bool valid_double=true;

 		int point_num=0;

 		//getting the value from the entry and converting it to double

 		Glib::ustring mapvalue_str = entrywidget.get_text();

 		char * mapvalue_ch=new char [mapvalue_str.length()];

 		for(int i=0;i<(int)(mapvalue_str.length());i++)

 		  {

 		    if(((mapvalue_str[i]<'0')||(mapvalue_str[i]>'9'))&&(mapvalue_str[i]!='.'))

 		      {

 			valid_double=false;

 		      }

 		    else

 		      {

 			if(mapvalue_str[i]=='.')

 			  {

 			    point_num++;

 			  }

 		      }

 		    mapvalue_ch[i]=mapvalue_str[i];

 		  }

 		//if the text in the entry was correct

 		if((point_num<=1)&&(valid_double))

 		  {

 		    double mapvalue_d=atof(mapvalue_ch);

 		    //reconvert the double to string for the correct format

 		    std::ostringstream ostr;

 		    ostr << mapvalue_d;

 		    //save the value to the correct place

 		    switch(actual_tool)

 		      {

 		      case EDGE_MAP_EDIT:

 			edgetextmap[active_edge]->property_text().set_value(ostr.str());

 			(*(mapstorage.edgemap_storage)[edgemap_to_edit])[active_edge]=mapvalue_d;

 			mapwin.updateEdge(active_edge);

 			break;

 		      case NODE_MAP_EDIT:

 			nodetextmap[active_node]->property_text().set_value(ostr.str());

 			(*(mapstorage.nodemap_storage)[nodemap_to_edit])[active_node]=mapvalue_d;

 			mapwin.updateNode(active_node);

 			break;

 		      default:

 			break;

 		      }

 		    entrywidget.hide();

 		  }

 		//the text in the entry was not correct for a double

 		else

 		  {

 		    std::cerr << "ERROR: only handling of double values is implemented yet!" << std::endl;

 		  }

 		break;

 	      }

 	    default:

 	      break;

 	    }

 	}

     }

   return false;

 }

 void GraphDisplayerCanvas::deleteItem(Node node_to_delete)

 {

   delete(nodetextmap[node_to_delete]);

   delete(nodesmap[node_to_delete]);

   mapstorage.graph.erase(node_to_delete);

 }

 void GraphDisplayerCanvas::deleteItem(Edge edge_to_delete)

 {

   delete(edgetextmap[edge_to_delete]);

   delete(edgesmap[edge_to_delete]);

   mapstorage.graph.erase(edge_to_delete);

 }

 void GraphDisplayerCanvas::textReposition(xy<double> new_place)

 {

   new_place+=(xy<double>(10,10));

   edgetextmap[forming_edge]->property_x().set_value(new_place.x);

   edgetextmap[forming_edge]->property_y().set_value(new_place.y);

 }

 void GraphDisplayerCanvas::toggleEdgeActivity(BrokenEdge* active_bre, bool on)

 {

   if(on)

     {

       if(forming_edge!=INVALID)

 	{

 	  std::cerr << "ERROR!!!! Valid edge found!" << std::endl;

 	}

       else

 	{

 	  for (EdgeIt i(mapstorage.graph); i!=INVALID; ++i)

 	    {

 	      if(edgesmap[i]==active_bre)

 		{

 		  forming_edge=i;

 		}

 	    }

 	}

     }

   else

     {

       if(forming_edge!=INVALID)

 	{

 	  forming_edge=INVALID;

 	}

       else

 	{

 	  std::cerr << "ERROR!!!! Invalid edge found!" << std::endl;

 	}

     }

 }

 int GraphDisplayerCanvas::addNewEdgeMap(double default_value, std::string mapname)

 {

   //create the new map

   Graph::EdgeMap<double> * emptr=new Graph::EdgeMap<double> (mapstorage.graph, default_value);

   //if addition was not successful addEdgeMap returns one.

   //cause can be that there is already a map named like the new one

   if(mapstorage.addEdgeMap(mapname,emptr, default_value))

     {

       return 1;

     }

   //add it to the list of the displayable maps

   mapwin.registerNewEdgeMap(mapname);

   //display it

   changeEdgeText(mapname);

   return 0;

 }

 int GraphDisplayerCanvas::addNewNodeMap(double default_value, std::string mapname)

 {

   //create the new map

   Graph::NodeMap<double> * emptr=new Graph::NodeMap<double> (mapstorage.graph,default_value);

   //if addition was not successful addNodeMap returns one.

   //cause can be that there is already a map named like the new one

   if(mapstorage.addNodeMap(mapname,emptr, default_value))

     {

       return 1;

     }

   //add it to the list of the displayable maps

   mapwin.registerNewNodeMap(mapname);

   //display it

   changeNodeText(mapname);

   return 0;

 }