Addd a full screen toggle event handler to osgProducer & its viewer base

class.

src/osgProducer/FullScreenEventHandler.cpp

@@ -0,0 +1,44 @@
+#include <osgProducer/FullScreenEventHandler>
+
+using namespace osgProducer;
+
+bool FullScreenEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&)
+{
+    if(!_cg) return false;
+
+    if(ea.getEventType()==osgGA::GUIEventAdapter::KEYDOWN)
+    {
+
+        switch( ea.getKey() )
+        {
+          case 'f' :
+          {
+            Producer::CameraConfig* cfg = _cg->getCameraConfig();
+            for( unsigned int i = 0; i < cfg->getNumberOfCameras(); ++i )
+            {
+                Producer::Camera *cam = cfg->getCamera(i);
+                Producer::RenderSurface* rs = cam->getRenderSurface();
+                rs->fullScreen(!rs->isFullScreen());
+            }
+
+            return true;
+          }
+
+        default:
+            break;
+
+        }
+    }
+    return false;
+
+}
+
+void FullScreenEventHandler::accept(osgGA::GUIEventHandlerVisitor& gehv)
+{
+    gehv.visit(*this);
+}
+
+void FullScreenEventHandler::getUsage(osg::ApplicationUsage& usage) const
+{
+    usage.addKeyboardMouseBinding("f","Toggle fullscreen");
+}