From ae6623655c807e778315f478c8bfb60e44d5da51 Mon Sep 17 00:00:00 2001
From: ThorstenB <brehmt@gmail.com>
Date: Thu, 18 Aug 2011 21:32:24 +0200
Subject: [PATCH] #403: 2D horizontal scrolling on Mac OS Ignore events with
 X-axis scrolling only (getScrollingDeltaY() == 0). Thanks to Tatsuhiro
 Nishioka.

---
 src/Main/FGEventHandler.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Main/FGEventHandler.cxx b/src/Main/FGEventHandler.cxx
index 91d830e6d..e43f4b8ab 100644
--- a/src/Main/FGEventHandler.cxx
+++ b/src/Main/FGEventHandler.cxx
@@ -208,7 +208,7 @@ bool FGEventHandler::handle(const osgGA::GUIEventAdapter& ea,
         if (ea.getScrollingMotion() == osgGA::GUIEventAdapter::SCROLL_2D) {
             if (ea.getScrollingDeltaY() > 0)
                 button = 3;
-            else
+            else if (ea.getScrollingDeltaY() < 0)
                 button = 4;
         } else if (ea.getScrollingMotion() == osgGA::GUIEventAdapter::SCROLL_UP)
             button = 3;