From 9553bd08b7f8344f48a93c985d7c2bcb74a5a68e Mon Sep 17 00:00:00 2001
From: David DeSandro <desandrocodes@gmail.com>
Date: Wed, 24 Jun 2015 14:14:46 -0400
Subject: [PATCH] dismiss HTML5 drag events with jQuery dragging

Fixes #206
---
 changelog.md  |  2 ++
 js/packery.js | 14 ++++++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/changelog.md b/changelog.md
index f1a0bd3..48c58c6 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,7 @@
 # Changelog
 
++ Fixed bug with HTML5 drag & drop. Fixed [#206](https://github.com/metafizzy/packery/issues/206)
+
 ### v1.4.1
 
 + Remove `instance` argument from `dragItemPositioned` and `fitComplete` events
diff --git a/js/packery.js b/js/packery.js
index 01613e0..028049a 100644
--- a/js/packery.js
+++ b/js/packery.js
@@ -86,13 +86,23 @@ Packery.prototype._create = function() {
   };
 
   this.handleUIDraggable = {
-    start: function handleUIDraggableStart( event ) {
+    start: function handleUIDraggableStart( event, ui ) {
+      // HTML5 may trigger dragstart, dismiss HTML5 dragging
+      if ( !ui ) {
+        return;
+      }
       _this.itemDragStart( event.currentTarget );
     },
     drag: function handleUIDraggableDrag( event, ui ) {
+      if ( !ui ) {
+        return;
+      }
       _this.itemDragMove( event.currentTarget, ui.position.left, ui.position.top );
     },
-    stop: function handleUIDraggableStop( event ) {
+    stop: function handleUIDraggableStop( event, ui ) {
+      if ( !ui ) {
+        return;
+      }
       _this.itemDragEnd( event.currentTarget );
     }
   };