From 8cda866622c07a81b2e56da3d08d0864761698d7 Mon Sep 17 00:00:00 2001
From: Christopher Dyken <cdyk@users.noreply.github.com>
Date: Wed, 11 Jun 2014 20:17:30 +0200
Subject: [PATCH] Added handling of empty touchlist in touchend (which is the
 case for touch-emulation in chrome). Cache the most recent event and use that
 instead.

---
 js/gui/Canvas.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/js/gui/Canvas.js b/js/gui/Canvas.js
index 36ac2fc..8180e93 100644
--- a/js/gui/Canvas.js
+++ b/js/gui/Canvas.js
@@ -256,6 +256,7 @@ dojo.declare("gui.Canvas", [dijit._Widget], {
 
     _touchstart: function (event) {
         this._active = true;
+        this._touch_prev = event;
 
         // We need to add the relative placement informatoin to all touch events
         for(var i = 0; i < event.touches.length; ++i) {
@@ -280,6 +281,11 @@ dojo.declare("gui.Canvas", [dijit._Widget], {
 
     _touchend: function (event) {
         this._active = false;
+        if( event.touches.length == 0 ) {
+            // Use last active position
+            event = this._touch_prev;
+        }
+
         for(var i = 0; i < event.touches.length; ++i) {
             var x = event.touches[i].pageX - this._placementX();
             var y = event.touches[i].pageY - this._placementY();
@@ -303,6 +309,7 @@ dojo.declare("gui.Canvas", [dijit._Widget], {
     },
 
     _touchmove: function (event) {
+        this._touch_prev = event;
         for(var i = 0; i < event.touches.length; ++i) {
             var x = event.touches[i].pageX - this._placementX();
             var y = event.touches[i].pageY - this._placementY();