#include <graph_displayer_canvas.h>

#include <broken_edge.h>

#include <math.h>

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(g); 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)

      {

	//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;

        g.firstOut(ei,active_node);

        for(;ei!=INVALID;g.nextOut(ei))

        {

            Gnome::Canvas::Points coos;

            double x1, x2, y1, y2;

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

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

            nodesmap[g.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);

        }

        g.firstIn(ei,active_node);

        for(;ei!=INVALID;g.nextIn(ei))

        {

            Gnome::Canvas::Points coos;

            double x1, x2, y1, y2;

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

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

            nodesmap[g.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)

    {

      //draw the new node in red at the clicked place

    case GDK_2BUTTON_PRESS:

      //std::cout << "double click" << std::endl;

      break;

    case GDK_BUTTON_PRESS:

      isbutton=1;

      active_node=NodeIt(g,g.addNode());

      //initiating values corresponding to new node in maps

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

      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("red");

      *(nodesmap[active_node]) << Gnome::Canvas::Properties::outline_color("black");

      (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");

      mapwin->updateNode(active_node);

      break;

      //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;

      }

      //finalize the new node

    case GDK_BUTTON_RELEASE:

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

      active_item->lower_to_bottom();

      target_item=NULL;

      target_item=get_item_at(clicked_x, clicked_y);

      active_item->raise_to_top();

      isbutton=0;

      if(target_item==active_item)

	{

	  //Its appropriate color is given by update.

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

	}

      else

	{

	  //In this case the given color has to be overwritten, because the noe covers an other item.

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

	}

      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(g); 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));

	      Graph::NodeIt target_node=INVALID;

	      for (NodeIt i(g); 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)		

		    {

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

		      //creating new edge

		      active_edge=EdgeIt(g,g.addEdge(active_node, target_node));

		      //initiating values corresponding to new edge in maps

		      mapstorage.initMapsForEdge(active_edge);

		      //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);

		      //redraw nodes to blank terminations of the new edge

		      target_item->raise_to_top();

		      active_item->raise_to_top();

		      //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");

		      //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(g); i!=INVALID; ++i)

	{

	  if(nodesmap[i]==active_item)

	    {

	      active_node=i;

	    }

	}

      //or was it an edge?

      if(active_node==INVALID)

	{

	  for (EdgeIt i(g); 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)

		{

		  //collecting edges to delete

		  EdgeIt e;

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

		  g.firstOut(e,active_node);

		  for(;e!=INVALID;g.nextOut(e))

		    {

		      edges_to_delete.insert(e);

		    }

		  g.firstIn(e,active_node);

		  for(;e!=INVALID;g.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

	    Graph::EdgeIt clicked_edge=INVALID;

	    //find the activated item between texts

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

	    for (EdgeIt i(g); 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(g); 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)

	      {

		//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);

		      }

		  }

	      }

	    //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

	    Graph::NodeIt clicked_node=INVALID;

	    //find the activated item between texts

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

	    for (NodeIt i(g); 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(g); 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)

	      {

		//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(NodeIt node_to_delete)

{

  delete(nodetextmap[node_to_delete]);

  delete(nodesmap[node_to_delete]);

  g.erase(node_to_delete);

}

void GraphDisplayerCanvas::deleteItem(EdgeIt edge_to_delete)

{

  delete(edgetextmap[edge_to_delete]);

  delete(edgesmap[edge_to_delete]);

  g.erase(edge_to_delete);

}

void GraphDisplayerCanvas::deleteItem(Graph::Edge edge_to_delete)

{

  delete(edgetextmap[edge_to_delete]);

  delete(edgesmap[edge_to_delete]);

  g.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(g); 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> (g,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))

    {

      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> (g,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))

    {

      return 1;

    }

  //add it to the list of the displayable maps

  mapwin->registerNewNodeMap(mapname);

  //display it

  changeNodeText(mapname);

  return 0;

}