From b0e7be9d4dab13aba1344368cacd6be1487359e0 Mon Sep 17 00:00:00 2001
From: inDream <indreamhk@gmail.com>
Date: Sat, 28 Jun 2014 17:56:10 +0800
Subject: [PATCH] Only add necessary events to optimize performance

---
 src/snap.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/snap.js b/src/snap.js
index 9e4ae4f..31f7907 100755
--- a/src/snap.js
+++ b/src/snap.js
@@ -408,8 +408,6 @@
                     cache.translation = 0;
                     cache.easing = false;
                     utils.events.addEvent(self.settings.element, utils.eventType('down'), action.drag.startDrag);
-                    utils.events.addEvent(self.settings.element, utils.eventType('move'), action.drag.dragging);
-                    utils.events.addEvent(self.settings.element, utils.eventType('up'), action.drag.endDrag);
                 },
 
                 /**
@@ -474,6 +472,10 @@
                             percentage: 0
                         }
                     };
+
+                    // Optimize performance
+                    utils.events.addEvent(self.settings.element, utils.eventType('move'), action.drag.dragging);
+                    utils.events.addEvent(self.settings.element, utils.eventType('up'), action.drag.endDrag);
                 },
 
                 /**
@@ -643,6 +645,10 @@
                         cache.isDragging = false;
                         cache.startDragX = utils.page('X', e);
                     }
+
+                    // Optimize performance
+                    utils.events.removeEvent(settings.element, utils.eventType('move'), action.drag.dragging);
+                    utils.events.removeEvent(settings.element, utils.eventType('up'), action.drag.endDrag);
                 }
             }
         };