From 0fc5c69b3f95ed6d0e9d6e794ffb8a2a9194f38b Mon Sep 17 00:00:00 2001
From: Hyunje Jun <hyunje.jun@linecorp.com>
Date: Tue, 18 Oct 2016 11:49:20 +0900
Subject: [PATCH] Add metaKey and altKey handling in keyboard handler

Resolve #549.
---
 src/js/plugin/handler/keyboard.js | 32 +++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/src/js/plugin/handler/keyboard.js b/src/js/plugin/handler/keyboard.js
index 5c4db17..b23a3bd 100644
--- a/src/js/plugin/handler/keyboard.js
+++ b/src/js/plugin/handler/keyboard.js
@@ -71,16 +71,40 @@ function bindKeyboardHandler(element, i) {
 
     switch (e.which) {
     case 37: // left
-      deltaX = -30;
+      if (e.metaKey) {
+        deltaX = -i.contentWidth;
+      } else if (e.altKey) {
+        deltaX = -i.containerWidth;
+      } else {
+        deltaX = -30;
+      }
       break;
     case 38: // up
-      deltaY = 30;
+      if (e.metaKey) {
+        deltaY = i.contentHeight;
+      } else if (e.altKey) {
+        deltaY = i.containerHeight;
+      } else {
+        deltaY = 30;
+      }
       break;
     case 39: // right
-      deltaX = 30;
+      if (e.metaKey) {
+        deltaX = i.contentWidth;
+      } else if (e.altKey) {
+        deltaX = i.containerWidth;
+      } else {
+        deltaX = 30;
+      }
       break;
     case 40: // down
-      deltaY = -30;
+      if (e.metaKey) {
+        deltaY = -i.contentHeight;
+      } else if (e.altKey) {
+        deltaY = -i.containerHeight;
+      } else {
+        deltaY = -30;
+      }
       break;
     case 33: // page up
       deltaY = 90;