From cbcf0c931278671f4db01ff384f4973a7be322eb Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Thu, 21 Jun 2012 08:52:29 +0000
Subject: Fixed STR #2644: support horizontal wheel movement under X11 and
 MSWindows.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9624 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/Fl_x.cxx | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/Fl_x.cxx')

diff --git a/src/Fl_x.cxx b/src/Fl_x.cxx
index ef3906a4e..fa48e5fef 100644
--- a/src/Fl_x.cxx
+++ b/src/Fl_x.cxx
@@ -1506,12 +1506,19 @@ int fl_handle(const XEvent& thisevent)
   case ButtonPress:
     Fl::e_keysym = FL_Button + xevent.xbutton.button;
     set_event_xy();
+    Fl::e_dx = Fl::e_dy = 0;
     if (xevent.xbutton.button == Button4) {
       Fl::e_dy = -1; // Up
       event = FL_MOUSEWHEEL;
     } else if (xevent.xbutton.button == Button5) {
       Fl::e_dy = +1; // Down
       event = FL_MOUSEWHEEL;
+    } else if (xevent.xbutton.button == 6) {
+	Fl::e_dx = -1; // Left
+	event = FL_MOUSEWHEEL;
+    } else if (xevent.xbutton.button == 7) {
+	Fl::e_dx = +1; // Right
+	event = FL_MOUSEWHEEL;
     } else {
       Fl::e_state |= (FL_BUTTON1 << (xevent.xbutton.button-1));
       event = FL_PUSH;
-- 
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