Add requestAnimationFrame.js

Author: Amir Tocker

src/Util/requestAnimationFrame.js

@@ -0,0 +1,31 @@
+// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
+// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
+// https://gist.github.com/paulirish/1579671
+// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel
+
+// MIT license
+
+(function() {
+  var lastTime = 0;
+  var vendors = ['ms', 'moz', 'webkit', 'o'];
+  for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
+    window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
+    window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame']
+      || window[vendors[x]+'CancelRequestAnimationFrame'];
+  }
+
+  if (!window.requestAnimationFrame)
+    window.requestAnimationFrame = function(callback, element) {
+      var currTime = new Date().getTime();
+      var timeToCall = Math.max(0, 16 - (currTime - lastTime));
+      var id = window.setTimeout(function() { callback(currTime + timeToCall); },
+        timeToCall);
+      lastTime = currTime + timeToCall;
+      return id;
+    };
+
+  if (!window.cancelAnimationFrame)
+    window.cancelAnimationFrame = function(id) {
+      clearTimeout(id);
+    };
+}());