content/browser/resources/media/util.js

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview Some utility functions that don't belong anywhere else in the
   7  * code.
   8  */
   9
  10 var util = (function() {
  11   var util = {};
  12   util.object = {};
  13   /**
  14    * Calls a function for each element in an object/map/hash.
  15    *
  16    * @param obj The object to iterate over.
  17    * @param f The function to call on every value in the object.  F should have
  18    * the following arguments: f(value, key, object) where value is the value
  19    * of the property, key is the corresponding key, and obj is the object that
  20    * was passed in originally.
  21    * @param optObj The object use as 'this' within f.
  22    */
  23   util.object.forEach = function(obj, f, optObj) {
  24     'use strict';
  25     var key;
  26     for (key in obj) {
  27       if (obj.hasOwnProperty(key)) {
  28         f.call(optObj, obj[key], key, obj);
  29       }
  30     }
  31   };
  32   util.millisecondsToString = function(timeMillis) {
  33     function pad(num) {
  34       num = num.toString();
  35       if (num.length < 2) {
  36         return '0' + num;
  37       }
  38       return num;
  39     }
  40
  41     var date = new Date(timeMillis);
  42     return pad(date.getUTCHours()) + ':' + pad(date.getUTCMinutes()) + ':' +
  43         pad(date.getUTCSeconds()) + ' ' + pad((date.getMilliseconds()) % 1000);
  44   };
  45
  46   return util;
  47 }());