Canvas Event System: add missing currentTarget field.

simgear/canvas/CanvasEvent.cxx

@@ -62,6 +62,12 @@ namespace canvas
     return target;
   }
 
+  //----------------------------------------------------------------------------
+  ElementWeakPtr Event::getCurrentTarget() const
+  {
+    return current_target;
+  }
+
   //----------------------------------------------------------------------------
   double Event::getTime() const
   {

simgear/canvas/CanvasEvent.hxx

@@ -41,7 +41,8 @@ namespace canvas
       };
 
       Type              type;
-      ElementWeakPtr    target;
+      ElementWeakPtr    target,
+                        current_target;
       double            time;
       bool              propagation_stopped;
 
@@ -55,6 +56,7 @@ namespace canvas
       std::string getTypeString() const;
 
       ElementWeakPtr getTarget() const;
+      ElementWeakPtr getCurrentTarget() const;
 
       double getTime() const;
 

simgear/canvas/CanvasEventManager.cxx

@@ -299,6 +299,7 @@ namespace canvas
         //mouse_event->delta = it->local_delta;
       }
 
+      event->current_target = el;
       el->handleEvent(event);
 
       if( event->propagation_stopped || !do_bubble )