From 8447fa8027b2492abd8369c5c766aee2500a3336 Mon Sep 17 00:00:00 2001
From: Ali Taheri <ali.taheri.m@gmail.com>
Date: Wed, 25 Nov 2015 02:59:18 +0330
Subject: [PATCH] Made LeftNav swipable only from far left (or right)

---
 src/left-nav.jsx | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/src/left-nav.jsx b/src/left-nav.jsx
index 3571e973492f16..6fe04ee5c124e2 100644
--- a/src/left-nav.jsx
+++ b/src/left-nav.jsx
@@ -331,7 +331,24 @@ const LeftNav = React.createClass({
     }
   },
 
-  _onBodyTouchStart(e) {
+  _onBodyTouchStart(e) {  
+  
+    const swipeAreaWidth = 30;
+  
+    let touchStartX = e.touches[0].pageX;
+    let touchStartY = e.touches[0].pageY;
+    
+    // Open only if swiping from far left (or right) while closed
+    if (!this.state.open) {
+      if (this.props.openRight) {
+        // If openRight is true calculate from the far right
+        if (touchStartX < document.body.offsetWidth - swipeAreaWidth) return;
+      } else {
+        // If openRight is false calculate from the far left
+        if (touchStartX > swipeAreaWidth) return;
+      }
+    }
+    
     if (!this.state.open &&
          (openNavEventHandler !== this._onBodyTouchStart ||
           this.props.disableSwipeToOpen)
@@ -339,9 +356,6 @@ const LeftNav = React.createClass({
       return;
     }
 
-    let touchStartX = e.touches[0].pageX;
-    let touchStartY = e.touches[0].pageY;
-
     this._maybeSwiping = true;
     this._touchStartX = touchStartX;
     this._touchStartY = touchStartY;