request-animation-frame/lib/shim.js

requestAnimationFrame shim

(function() {
  var max, now, _ref, _ref2;

  now = (_ref = Date.now) != null ? _ref : function() {
    return new Date().getTime();
  };

  max = Math.max;

  _ref2 = (function() {
    var cancel, isNative, last, request, vendor, _i, _len, _ref2;
    last = 0;
    request = typeof window !== "undefined" && window !== null ? window.requestAnimationFrame : void 0;
    cancel = typeof window !== "undefined" && window !== null ? window.cancelAnimationFrame : void 0;
    _ref2 = ["webkit", "moz", "o", "ms"];
    for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
      vendor = _ref2[_i];
      if (cancel == null) {
        cancel = (typeof window !== "undefined" && window !== null ? window["" + vendor + "cancelAnimationFrame"] : void 0) || (typeof window !== "undefined" && window !== null ? window["" + vendor + "cancelRequestAnimationFrame"] : void 0);
      }
      if ((request != null ? request : request = typeof window !== "undefined" && window !== null ? window["" + vendor + "RequestAnimationFrame"] : void 0)) {
        break;
      }
    }
    isNative = request != null;
    request = request != null ? request : function(callback, timeout) {
      var cur, id, time;
      if (timeout == null) timeout = 16;
      cur = now();
      time = max(0, timeout + last - cur);
      id = setTimeout(function() {
        return typeof callback === "function" ? callback(cur + time) : void 0;
      }, time);
      last = cur + time;
      return id;
    };
    request.isNative = isNative;
    isNative = cancel != null;
    cancel = cancel != null ? cancel : function(id) {
      return clearTimeout(id);
    };
    cancel.isNative = isNative;
    return [request, cancel];
  })(), this.requestAnimationFrame = _ref2[0], this.cancelAnimationFrame = _ref2[1];

}).call(this);