mirror of
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96 lines
3.2 KiB
JavaScript
96 lines
3.2 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 mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Joe Hewitt <hewitt@netscape.com> (original author)
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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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/***************************************************************
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* ObserverManager -----------------------------------------------
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* Manages observer and event dispatching for an object.
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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* REQUIRED IMPORTS:
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****************************************************************/
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////////////////////////////////////////////////////////////////////////////
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//// class ObserverManager
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function ObserverManager(aTarget)
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{
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this.mTarget = aTarget;
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this.mObservers = {};
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}
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ObserverManager.prototype =
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{
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addObserver: function(aEventName, aObserver)
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{
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var list;
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if (!(aEventName in this.mObservers)) {
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list = [];
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this.mObservers[aEventName] = list;
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} else
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list = this.mObservers[aEventName];
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list.push(aObserver);
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},
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removeObserver: function(aEventName, aObserver)
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{
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if (aEventName in this.mObservers) {
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var list = this.mObservers[aEventName];
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for (var i = 0; i < list.length; ++i) {
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if (list[i] == aObserver) {
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list.splice(i, 1);
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return;
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}
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}
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}
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},
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dispatchEvent: function(aEventName, aEventData)
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{
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if (aEventName in this.mObservers) {
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if (!("target" in aEventData))
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aEventData.target = this.mTarget;
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aEventData.type = aEventName;
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var list = this.mObservers[aEventName];
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for (var i = 0; i < list.length; ++i)
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list[i].onEvent(aEventData);
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}
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}
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};
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