Improve pick-callback enabled testing.

simgear/scene/model/SGPickAnimation.cxx

@@ -108,6 +108,10 @@ osg::Vec2d eventToWindowCoords(const osgGA::GUIEventAdapter& ea)
            return false;
        }
 
+       if (!anyBindingEnabled(_bindingsDown)) {
+           return false;
+       }
+
      fireBindingList(_bindingsDown);
      _repeatTime = -_repeatInterval;    // anti-bobble: delay start of repeat
      return true;
@@ -136,7 +140,7 @@ osg::Vec2d eventToWindowCoords(const osgGA::GUIEventAdapter& ea)
    virtual bool hover( const osg::Vec2d& windowPos,
                        const Info& )
    {
-       if (_hover.empty()) {
+       if (!anyBindingEnabled(_hover)) {
            return false;
        }
        

simgear/structure/SGBinding.cxx

@@ -165,3 +165,18 @@ void clearBindingList(const SGBindingList& aBindings)
     }
 }
 
+bool anyBindingEnabled(const SGBindingList& aBindings)
+{
+    if (aBindings.empty()) {
+        return false;
+    }
+
+    BOOST_FOREACH(SGBinding_ptr b, aBindings) {
+        if (!b->test()) {
+            return false;
+        }
+    }
+
+    return true;
+}
+

simgear/structure/SGBinding.hxx

@@ -171,4 +171,10 @@ SGBindingList readBindingList(const simgear::PropertyList& aNodes, SGPropertyNod
  */
 void clearBindingList(const SGBindingList& aBindings);
 
+/**
+ * check if at least one binding in the list is enabled. Returns false if bindings
+ * list is empty, or all bindings are conditinally disabled.
+ */
+bool anyBindingEnabled(const SGBindingList& bindings);
+
 #endif