From 98f691f693e909aee3b8509502953be8f789bd8d Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Sun, 6 Apr 2003 21:46:48 +0000
Subject: [PATCH] Added if (!_kbmcb) to handle the case where the keyboard
 mouse callback is pre set.

---
 src/osgProducer/Viewer.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/osgProducer/Viewer.cpp b/src/osgProducer/Viewer.cpp
index 76711525a..540828a2a 100644
--- a/src/osgProducer/Viewer.cpp
+++ b/src/osgProducer/Viewer.cpp
@@ -88,7 +88,9 @@ void Viewer::setUpViewer(unsigned int options)
     _start_tick = _timer.tick();
 
     // set the keyboard mouse callback to catch the events from the windows.
-    _kbmcb = new osgProducer::KeyboardMouseCallback( kbm, _done, (options & ESCAPE_SETS_DONE)!=0 );
+    if (!_kbmcb)
+        _kbmcb = new osgProducer::KeyboardMouseCallback( kbm, _done, (options & ESCAPE_SETS_DONE)!=0 );
+        
     _kbmcb->setStartTick(_start_tick);
     
     // register the callback with the keyboard mouse manger.