From 1ad9979cea96e1317dfe2beaff0eaa4352750e6a Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 25 Aug 2011 15:39:09 +0000
Subject: [PATCH] Added event handling for toggling on/off the light source
 animation.

---
 examples/osgshadow/osgshadow.cpp | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/examples/osgshadow/osgshadow.cpp b/examples/osgshadow/osgshadow.cpp
index 16074100d..1a62e82ea 100644
--- a/examples/osgshadow/osgshadow.cpp
+++ b/examples/osgshadow/osgshadow.cpp
@@ -138,6 +138,33 @@ public:
 };
 
 
+class LightAnimationHandler : public osgGA::GUIEventHandler
+{
+public:
+    LightAnimationHandler(bool flag=true): _animating(flag) {}
+
+    void setAnimating(bool flag) { _animating = flag; }
+    bool getAnimating() const { return _animating; }
+
+    /** Deprecated, Handle events, return true if handled, false otherwise. */
+    virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa)
+    {
+        if (ea.getEventType() == osgGA::GUIEventAdapter::KEYUP)
+        {
+            if (ea.getKey() == 'p' )
+            {
+                _animating = !_animating;
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    bool  _animating;
+};
+
+
 static int ReceivesShadowTraversalMask = 0x1;
 static int CastsShadowTraversalMask = 0x2;
 
@@ -973,6 +1000,9 @@ int main(int argc, char** argv)
         }
     }
 
+    osg::ref_ptr<LightAnimationHandler> lightAnimationHandler = updateLightPosition ? new LightAnimationHandler : 0;
+    if (lightAnimationHandler) viewer.addEventHandler(lightAnimationHandler.get());
+
 
     // osgDB::writeNodeFile(*group,"test.osgt");
  
@@ -1002,7 +1032,7 @@ int main(int argc, char** argv)
             }        
         }
 
-        if (updateLightPosition)
+        if (lightAnimationHandler.valid() && lightAnimationHandler ->getAnimating())
         {
             float t = viewer.getFrameStamp()->getSimulationTime();