From 11fcd09a9965ee42196b964ea21867f0932fc6ec Mon Sep 17 00:00:00 2001
From: Hyunje Jun <hyunje.jun@linecorp.com>
Date: Tue, 18 Oct 2016 11:55:03 +0900
Subject: [PATCH] Reverse wheel scroll axis on shift pressed

Resolve #548.
---
 src/js/plugin/handler/mouse-wheel.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/js/plugin/handler/mouse-wheel.js b/src/js/plugin/handler/mouse-wheel.js
index 86677e7..a861619 100644
--- a/src/js/plugin/handler/mouse-wheel.js
+++ b/src/js/plugin/handler/mouse-wheel.js
@@ -52,6 +52,10 @@ function bindMouseWheelHandler(element, i) {
       deltaY = e.wheelDelta;
     }
 
+    if (e.shiftKey) {
+      // reverse axis with shift key
+      return [-deltaY, -deltaX];
+    }
     return [deltaX, deltaY];
   }