From d3181f0b0dcb396cd2598bd9d2cfb867592d02e1 Mon Sep 17 00:00:00 2001
From: Hyunje Alex Jun <me@noraesae.net>
Date: Mon, 15 Sep 2014 22:53:40 +0100
Subject: [PATCH] Mousewheel fixes for Firefox and IE 10.

Now tested with the latest versions of following browsers.

In OS X:
Chrome
Firefox
Safari

In Windows:
Chrome
Firefox
Internet Explorer 10
Opera
Safari
---
 src/perfect-scrollbar.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/perfect-scrollbar.js b/src/perfect-scrollbar.js
index a0b01e2..1241f3e 100644
--- a/src/perfect-scrollbar.js
+++ b/src/perfect-scrollbar.js
@@ -348,6 +348,18 @@
             deltaY = e.originalEvent.wheelDeltaY / 6;
           }
 
+          if (e.originalEvent.deltaMode && e.originalEvent.deltaMode === 1) {
+            // Firefox in deltaMode 1: Line scrolling
+            deltaX *= 10;
+            deltaY *= 10;
+          }
+
+          if (deltaX !== deltaX && deltaY !== deltaY/* NaN checks */) {
+            // IE in some mouse drivers
+            deltaX = 0;
+            deltaY = e.originalEvent.wheelDelta;
+          }
+
           return [deltaX, deltaY];
         };