/usr/share/xul-ext/ubiquity/modules/eventhub.js is in xul-ext-ubiquity 0.6.4~pre20140729-1.
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Ubiquity.
*
* The Initial Developer of the Original Code is Mozilla.
* Portions created by the Initial Developer are Copyright (C) 2007
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Atul Varma <atul@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
// = EventHub =
//
// This is a simple class that can be used to provide an Observer pattern
// to any functionality that needs it.
var EXPORTED_SYMBOLS = ['EventHub'];
// == The EventHub Class ==
//
// Creating an instance of this class takes no arguments.
function EventHub() {
let self = this;
let listeners = {};
function ensureEventName(eventName) {
if (!(eventName in listeners))
listeners[eventName] = [];
};
// === {{{EventHub#addListener()}}} ===
//
// Adds a listener which will be called back whenever an event
// of the given name occurs.
self.addListener = function addListener(eventName, listener) {
ensureEventName(eventName);
if (listeners[eventName].indexOf(listener) != -1)
throw new Error('Listener already registered for event "' + eventName +
'"');
listeners[eventName].push(listener);
};
// === {{{EventHub#removeListener()}}} ===
//
// Removes the given listener from being called back whenever the
// event of the given name occurs.
self.removeListener = function removeListener(eventName, listener) {
ensureEventName(eventName);
let index = listeners[eventName].indexOf(listener);
if (index == -1)
throw new Error('Listener not registered for event "' + eventName +
'"');
listeners[eventName].splice(index, 1);
};
// === {{{EventHub#notifyListeners()}}} ===
//
// Calls all registered listeners of the given event name, passing
// them the event name and the given data as arguments.
self.notifyListeners = function notifyListeners(eventName, data) {
ensureEventName(eventName);
function notify(listener) {
listener(eventName, data);
}
var listenersCopy = listeners[eventName].slice();
listenersCopy.forEach(notify);
};
// === {{{EventHub#attachMethods()}}} ===
//
// This function attaches its {{{addListener()}}} and
// {{{removeListener()}}} methods to the given object. It's useful
// as a way of dynamically adding observability to any object: the
// object keeps a privately-accessible {{{EventHub}}} instance so
// that it can notify listeners, and listeners can use the object's
// public methods to register and unregister themselves.
self.attachMethods = function attachMethods(target) {
target.addListener = self.addListener;
target.removeListener = self.removeListener;
};
}
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