Changeset 1478:bc7ae573d77d in lemon-0.x for gui/graph_displayer_canvas.cc

Timestamp:

06/13/05 21:49:33 (19 years ago)

Author:

Hegyi Péter

Branch:

default

Phase:

public

Convert:

svn:c9d7d8f5-90d6-0310-b91f-818b3a526b0e/lemon/trunk@1958

Message:

Known bugs are eliminated from gui, and new ones are created by changing tool selectors to special radiobuttons, and by adding edgecreation-canceller function (right-click on any group element).

File:

• gui/graph_displayer_canvas.cc (modified) (7 diffs)

gui/graph_displayer_canvas.cc

@@ -6 +6 @@
   
   actual_handler=displayed_graph.signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::create_edge_event_handler), false);
+
+  active_node=INVALID;
+  active_edge=INVALID;
 
   //set_center_scroll_region(true);
@@ -311 +314 @@
       actual_handler=displayed_graph.signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::move_event_handler), 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::create_node_event_handler), false);
       break;
+
     case CREATE_EDGE:
       actual_handler=displayed_graph.signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::create_edge_event_handler), false);
@@ -344 +350 @@
       isbutton=false;
       active_item=NULL;
+      active_node=INVALID;
       updateScrollRegion();
       break;
     case GDK_MOTION_NOTIFY:
-      //we only have to do sg. if the mouse button is pressed
-      if(isbutton)
+      //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,
@@ -417 +424 @@
   switch(e->type)
     {
+
+      //draw the new node in red at the clicked place
     case GDK_BUTTON_PRESS:
       isbutton=true;
@@ -430 +439 @@
       (nodesmap[active_node])->show();
       break;
+
+      //move the new node
     case GDK_MOTION_NOTIFY:
       {
@@ -441 +452 @@
         break;
       }
+
+      //finalize the new node
     case GDK_BUTTON_RELEASE:
       isbutton=false;
       *active_item << Gnome::Canvas::Properties::fill_color("blue");
       active_item=NULL;
+      active_node=INVALID;
       updateScrollRegion();
       break;
@@ -458 +472 @@
     {
     case GDK_BUTTON_PRESS:
-      if(!active_item)
+      //in edge creatino right button has special meaning
+      if(e->button.button!=3)
         {
-          //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)
+          //there is not yet selected node
+          if(active_node==INVALID)
             {
-              if(nodesmap[i]==active_item)
+              //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)
                 {
-                  active_node=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=true;
+                }
+              //clicked item was not a node. It could be e.g. edge.
+              else
+                {
+                  active_item=NULL;
                 }
             }
-          *(nodesmap[active_node]) << Gnome::Canvas::Properties::fill_color("red");
-          isbutton=true;
-        }
-      else
-        {
-          target_item=(get_item_at(e->button.x, e->button.y));
-          Graph::NodeIt target_node=INVALID;
-          for (NodeIt i(g); i!=INVALID; ++i)
+          //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
             {
-              if(nodesmap[i]==target_item)
+              target_item=(get_item_at(e->button.x, e->button.y));
+              Graph::NodeIt target_node=INVALID;
+              for (NodeIt i(g); i!=INVALID; ++i)
                 {
-                  target_node=i;
+                  if(nodesmap[i]==target_item)
+                    {
+                      target_node=i;
+                    }
+                }
+              //the clicked item is a node, the edge can be drawn
+              if(target_node!=INVALID)
+                {
+                  *(nodesmap[target_node]) << Gnome::Canvas::Properties::fill_color("red");
+
+                  //creating new edge
+                  active_edge=EdgeIt(g,g.addEdge(active_node, target_node));
+          
+                  //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 Gnome::Canvas::Line(displayed_graph, coos);
+                  *(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
+                  edgesmap[active_edge]->get_bounds(x1, y1, x2, y2);
+                  edgetextmap[active_edge]=new Gnome::Canvas::Text(displayed_graph,(x1+x2)/2, (y1+y2)/2, "");
+                  edgetextmap[active_edge]->property_fill_color().set_value("black");
+                }
+              //clicked item was not a node. it could be an e.g. edge. we do not deal with it furthermore.
+              else
+                {
+                  target_item=NULL;
                 }
             }
-          *(nodesmap[target_node]) << Gnome::Canvas::Properties::fill_color("red");
-
-          //creating new edge
-          //      Graph::Edge new_edge=g.addEdge(active_node, target_node);
-          active_edge=EdgeIt(g,g.addEdge(active_node, target_node));
-          
-          //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 Gnome::Canvas::Line(displayed_graph, coos);
-          *(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
-          edgesmap[active_edge]->get_bounds(x1, y1, x2, y2);
-          edgetextmap[active_edge]=new Gnome::Canvas::Text(displayed_graph,(x1+x2)/2, (y1+y2)/2, "");
-          edgetextmap[active_edge]->property_fill_color().set_value("black");
         }
       break;
     case GDK_BUTTON_RELEASE:
       isbutton=false;
-      if(target_item)
+      //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))
         {
-          *active_item << Gnome::Canvas::Properties::fill_color("blue");
-          *target_item << Gnome::Canvas::Properties::fill_color("blue");
-          active_item=NULL;
-          target_item=NULL;
+          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;