source: lemon-0.x/gui/graph_displayer_canvas-event.cc @ 1524:587a823bcdd0

#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)
{
  actual_handler.disconnect();

  if(actual_tool==CREATE_EDGE)
    {
        GdkEvent * generated=new GdkEvent();
        generated->type=GDK_BUTTON_RELEASE;
        generated->button.button=3;
        createEdgeEventHandler(generated);      
    }

  actual_tool=newtool;

  switch(newtool)
    {
    case MOVE:
      actual_handler=displayed_graph.signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::moveEventHandler), false);
      break;

      //it has to assigned to canvas, because all the canvas has to be monitored, not only the elements of the already drawn group
    case CREATE_NODE:
      actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::createNodeEventHandler), false);
      break;

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

    case ERASER:
      actual_handler=displayed_graph.signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::eraserEventHandler), 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
      clicked_x=e->button.x;
      clicked_y=e->button.y;
      active_item=(get_item_at(e->button.x, e->button.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;
      updateScrollRegion();
      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 dx=e->motion.x-clicked_x;
        double dy=e->motion.y-clicked_y;

        //repositioning node and its text
        active_item->move(dx, dy);
        nodetextmap[active_node]->move(dx, dy);

        clicked_x=e->motion.x;
        clicked_y=e->motion.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 true;
}

bool GraphDisplayerCanvas::createNodeEventHandler(GdkEvent* e)
{
  switch(e->type)
    {

      //draw the new node in red at the clicked place
    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:
      {
        double world_motion_x, world_motion_y;
        GdkEvent * generated=new GdkEvent();
        window_to_world (e->motion.x, e->motion.y, world_motion_x, world_motion_y);
        generated->motion.x=world_motion_x;
        generated->motion.y=world_motion_y;
        generated->type=GDK_MOTION_NOTIFY;
        moveEventHandler(generated);      
        break;
      }

      //finalize the new node
    case GDK_BUTTON_RELEASE:
      isbutton=0;
      *active_item << Gnome::Canvas::Properties::fill_color("blue");
      active_item=NULL;
      active_node=INVALID;
      updateScrollRegion();
      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
              clicked_x=e->button.x;
              clicked_y=e->button.y;
              active_item=(get_item_at(e->button.x, e->button.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
            {
              target_item=(get_item_at(e->button.x, e->button.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::cout << "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:
      active_item=(get_item_at(e->button.x, e->button.y));
      active_node=INVALID;
      active_edge=INVALID;
      for (NodeIt i(g); i!=INVALID; ++i)
        {
          if(nodesmap[i]==active_item)
            {
              active_node=i;
            }
        }
      if(active_node==INVALID)
        {
          for (EdgeIt i(g); i!=INVALID; ++i)
            {
              if(edgesmap[i]==active_item)
                {
                  active_edge=i;
                }
            }
        }
    *active_item << Gnome::Canvas::Properties::fill_color("red");
      break;

    case GDK_BUTTON_RELEASE:
      if(active_item==(get_item_at(e->button.x, e->button.y)))
        {
          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 true;
}

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[active_edge]->property_x().set_value(new_place.x);
  edgetextmap[active_edge]->property_y().set_value(new_place.y);
}

void GraphDisplayerCanvas::toggleEdgeActivity(BrokenEdge* active_bre, bool on)
{
  if(on)
    {
      if(active_edge!=INVALID)
        {
          std::cout << "ERROR!!!! Valid edge found!" << std::endl;
        }
      else
        {
          for (EdgeIt i(g); i!=INVALID; ++i)
            {
              if(edgesmap[i]==active_bre)
                {
                  active_edge=i;
                }
            }
        }
    }
  else
    {
      if(active_edge!=INVALID)
        {
          active_edge=INVALID;
        }
      else
        {
          std::cout << "ERROR!!!! Invalid edge found!" << std::endl;
        }
    }

}