Display active audio streams on chrome://media-internals.

chrome/browser/resources/media_internals/item_store.js

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+

[Evan Stade, 2011/07/11 21:31:52]

namespace the stuff in this file via cr.define

[Scott Franklin, 2011/07/12 22:35:13]

Somehow I missed that everything else in here was doing that...
Done.

+// This class stores hashes by their id field and provides basic methods for
+// iterating over the collection.
+function ItemStore() {
+  this.items_ = {};
+};
+
+// Gets a sorted list of ids.
+ItemStore.prototype.ids = function() {

[Evan Stade, 2011/07/11 21:31:52]

ItemStore.prototype = {
  ids: function() {

  },

  addItem: function(item) {

  },

  ...

}

[Scott Franklin, 2011/07/12 22:35:13]

Oh, handy. Done.

+  var ids = [];
+  for (var i in this.items_)
+    ids.push(i);
+  return ids.sort();
+};
+
+// Adds an item to the store.
+ItemStore.prototype.addItem = function(item) {
+  this.items_[item.id] = item;
+};
+
+// Adds a hash of items to the store.
+ItemStore.prototype.addItems = function(items) {
+  for (id in items)
+    this.addItem(items[id]);
+};
+
+// Removes an item from the store.
+ItemStore.prototype.removeItem = function(id) {
+  delete this.items_[id];
+};
+
+// Maps the itemStore to an Array. Items are sorted by id.
+ItemStore.prototype.map = function(mapper) {

[Evan Stade, 2011/07/11 21:31:52]

jsdoc style documentation for functions and their params

[Scott Franklin, 2011/07/12 22:35:13]

Done.

+  var items = this.items_;
+  var ids = this.ids();
+  return ids.map(function(id) { return mapper(items[id]); });
+};