#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 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 != "coordinates_x") &&
            (it->first != "coordinates_y"))
        {
          (*(it->second))[active_node] =
            mapstorage.nodemap_default[it->first];
        }
      }
      // increment the id map's default value
      mapstorage.nodemap_default["id"] += 1.0;

      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 maps
              for (std::map<std::string,
                  Graph::EdgeMap<double>*>::const_iterator it =
                  mapstorage.edgemap_storage.begin(); it !=
                  mapstorage.edgemap_storage.end(); ++it)
              {
                (*(it->second))[active_edge] =
                  mapstorage.edgemap_default[it->first];
              }
              // increment the id map's default value
              mapstorage.edgemap_default["id"] += 1.0;

              //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
            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)
	      {
		if(edgetextmap[i]==active_item)
		  {
		    clicked_edge=i;
		  }
	      }

	    //if it was not between texts, search for it between edges
	    if(clicked_edge==INVALID)
	      {
		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 (edgemap_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;
}