From df0ed9f731b2494677651ff5c0bebcf989cbb8b3 Mon Sep 17 00:00:00 2001
From: Pierre Ossman <ossman@cendio.se>
Date: Tue, 24 May 2011 11:33:43 +0000
Subject: [PATCH] Handle horizontal wheel events and not just vertical.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4443 3789f03b-4d11-0410-bbf8-ca57d06f2519
---
 vncviewer/Viewport.cxx | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/vncviewer/Viewport.cxx b/vncviewer/Viewport.cxx
index 5b5f5bba..1d90f066 100644
--- a/vncviewer/Viewport.cxx
+++ b/vncviewer/Viewport.cxx
@@ -215,10 +215,15 @@ int Viewport::handle(int event)
       buttonMask |= 4;
 
     if (event == FL_MOUSEWHEEL) {
+      wheelMask = 0;
       if (Fl::event_dy() < 0)
-        wheelMask = 8;
-      else
-        wheelMask = 16;
+        wheelMask |= 8;
+      if (Fl::event_dy() > 0)
+        wheelMask |= 16;
+      if (Fl::event_dx() < 0)
+        wheelMask |= 32;
+      if (Fl::event_dx() > 0)
+        wheelMask |= 64;
 
       // A quick press of the wheel "button", followed by a immediate
       // release below
-- 
2.39.5