From 57fb076d8b1d7e7af0c81fb1fd5e7d94ed2ceb12 Mon Sep 17 00:00:00 2001
From: Daniel Freedman <dfreedm@google.com>
Date: Mon, 11 Aug 2014 11:54:29 -0700
Subject: [PATCH] Limit pointerevent move events to when a button is down

Fixes #37
---
 src/ms.js      | 12 ++++++------
 src/pointer.js | 12 ++++++------
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/src/ms.js b/src/ms.js
index 939ef0e..13c375a 100644
--- a/src/ms.js
+++ b/src/ms.js
@@ -19,9 +19,6 @@
       'MSPointerCancel',
     ],
     register: function(target) {
-      if (target !== document) {
-        return;
-      }
       dispatcher.listen(target, this.events);
     },
     unregister: function(target) {
@@ -53,9 +50,12 @@
       dispatcher.down(e);
     },
     MSPointerMove: function(inEvent) {
-      var e = this.prepareEvent(inEvent);
-      e.target = pointermap.get(e.pointerId);
-      dispatcher.move(e);
+      var target = pointermap.get(inEvent.pointerId);
+      if (target) {
+        var e = this.prepareEvent(inEvent);
+        e.target = target;
+        dispatcher.move(e);
+      }
     },
     MSPointerUp: function(inEvent) {
       var e = this.prepareEvent(inEvent);
diff --git a/src/pointer.js b/src/pointer.js
index 4db72e7..0294050 100644
--- a/src/pointer.js
+++ b/src/pointer.js
@@ -23,9 +23,6 @@
       return e;
     },
     register: function(target) {
-      if (target !== document) {
-        return;
-      }
       dispatcher.listen(target, this.events);
     },
     unregister: function(target) {
@@ -41,9 +38,12 @@
       dispatcher.down(e);
     },
     pointermove: function(inEvent) {
-      var e = this.prepareEvent(inEvent);
-      e.target = pointermap.get(e.pointerId);
-      dispatcher.move(e);
+      var target = pointermap.get(inEvent.pointerId);
+      if (target) {
+        var e = this.prepareEvent(inEvent);
+        e.target = target;
+        dispatcher.move(e);
+      }
     },
     pointerup: function(inEvent) {
       var e = this.prepareEvent(inEvent);