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101 lines
3.5 KiB
JavaScript
101 lines
3.5 KiB
JavaScript
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Observers.
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*
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* The Initial Developer of the Original Code is Daniel Aquino.
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Daniel Aquino <mr.danielaquino@gmail.com>
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* Myk Melez <myk@mozilla.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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let EXPORTED_SYMBOLS = ["Observers"];
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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cr = Components.results;
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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let Observers = {
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add: function(callback, topic) {
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let observer = new Observer(callback);
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if (!(topic in Observers._observers))
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Observers._observers[topic] = {};
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Observers._observers[topic][callback] = observer;
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Observers._service.addObserver(observer, topic, true);
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return observer;
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},
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remove: function(callback, topic) {
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let observer = Observers._observers[topic][callback];
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Observers._service.removeObserver(observer, topic);
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delete this._observers[topic][callback];
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},
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notify: function(subject, topic, data) {
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Observers._service.notifyObservers(new Subject(subject), topic, data);
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},
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_service: Cc["@mozilla.org/observer-service;1"].
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getService(Ci.nsIObserverService),
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_observers: {}
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};
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function Observer(callback) {
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this._callback = callback;
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}
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Observer.prototype = {
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
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observe: function(subject, topic, data) {
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// Pass the wrappedJSObject for subjects that have one. Otherwise pass
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// the subject itself. This way we support both wrapped subjects created
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// using this module and those that are real XPCOM components.
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if (subject && subject.wrappedJSObject)
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this._callback(subject.wrappedJSObject, topic, data);
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else
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this._callback(subject, topic, data);
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}
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}
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function Subject(object) {
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this.wrappedJSObject = object;
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}
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Subject.prototype = {
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QueryInterface: XPCOMUtils.generateQI([]),
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getHelperForLanguage: function() {},
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getInterfaces: function() {}
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};
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