Tatsuhiro Nishioka: #403, scroll up/down for Mac OS

Support osgViewer's Scroll_2D event (so far only available for Mac)

diff --git a/src/Main/FGEventHandler.cxx b/src/Main/FGEventHandler.cxx
index 5599723fa9228781a666630a8a0cebdadea4e01e..91d830e6dff1a561b9df7d1d4eb7a8b91e31b3d7 100644 (file)
--- a/src/Main/FGEventHandler.cxx
+++ b/src/Main/FGEventHandler.cxx
@@ -205,7 +205,12 @@ bool FGEventHandler::handle(const osgGA::GUIEventAdapter& ea,
             return true;
 #endif
         int button;
-        if (ea.getScrollingMotion() == osgGA::GUIEventAdapter::SCROLL_UP)
+        if (ea.getScrollingMotion() == osgGA::GUIEventAdapter::SCROLL_2D) {
+            if (ea.getScrollingDeltaY() > 0)
+                button = 3;
+            else
+                button = 4;
+        } else if (ea.getScrollingMotion() == osgGA::GUIEventAdapter::SCROLL_UP)
             button = 3;
         else
             button = 4;