Added Escape to the help list.

Changed the help key from '?' to 'h'

include/osgProducer/KeyboardMouseCallback

@@ -54,6 +54,10 @@ class OSGPRODUCER_EXPORT KeyboardMouseCallback : public Producer::KeyboardMouseC
 	virtual void specialKeyRelease( Producer::KeyCharacter key);
 
 
+        void setEscapeSetDone(bool esc) { _escapeKeySetsDone = esc; }
+        bool getEscapeSetDone() const { return _escapeKeySetsDone; }
+
+
         // local methods and members
         typedef std::vector< osg::ref_ptr<EventAdapter> > EventQueue;
 

src/osgProducer/Viewer.cpp

@@ -293,6 +293,11 @@ void Viewer::requestWarpPointer(int x,int y)
 
 void Viewer::getUsage(osg::ApplicationUsage& usage) const
 {
+    if (_kbmcb && _kbmcb->getEscapeSetDone()) 
+    {
+        usage.addKeyboardMouseBinding("Escape","Exit the application");
+    }
+
     for(EventHandlerList::const_iterator itr=_eventHandlerList.begin();
         itr!=_eventHandlerList.end();
         ++itr)

src/osgProducer/ViewerEventHandler.cpp

@@ -735,8 +735,7 @@ bool ViewerEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActio
             }
 
             case osgGA::GUIEventAdapter::KEY_Help :
-            case '/' :
-            case '?' :
+            case 'h' :
             {
                 setDisplayHelp(!getDisplayHelp());
                 return true;
@@ -759,7 +758,7 @@ void ViewerEventHandler::accept(osgGA::GUIEventHandlerVisitor& gehv)
 void ViewerEventHandler::getUsage(osg::ApplicationUsage& usage) const
 {
     usage.addKeyboardMouseBinding("f","Toggle fullscreen");
-    usage.addKeyboardMouseBinding("?","Display help");
+    usage.addKeyboardMouseBinding("h","Display help");
     usage.addKeyboardMouseBinding("o","Write scene graph to file");
     usage.addKeyboardMouseBinding("s","Toggle intrumention");
     usage.addKeyboardMouseBinding("v","Toggle block and vsync");