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- /* ***** BEGIN LICENSE BLOCK *****
- * Distributed under the BSD license:
- *
- * Copyright (c) 2010, Ajax.org B.V.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * * Neither the name of Ajax.org B.V. nor the
- * names of its contributors may be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * ***** END LICENSE BLOCK ***** */
- define(function(require, exports, module) {
- "use strict";
- var EventEmitter = {};
- var stopPropagation = function() { this.propagationStopped = true; };
- var preventDefault = function() { this.defaultPrevented = true; };
- EventEmitter._emit =
- EventEmitter._dispatchEvent = function(eventName, e) {
- this._eventRegistry || (this._eventRegistry = {});
- this._defaultHandlers || (this._defaultHandlers = {});
- var listeners = this._eventRegistry[eventName] || [];
- var defaultHandler = this._defaultHandlers[eventName];
- if (!listeners.length && !defaultHandler)
- return;
- if (typeof e != "object" || !e)
- e = {};
- if (!e.type)
- e.type = eventName;
- if (!e.stopPropagation)
- e.stopPropagation = stopPropagation;
- if (!e.preventDefault)
- e.preventDefault = preventDefault;
- listeners = listeners.slice();
- for (var i=0; i<listeners.length; i++) {
- listeners[i](e, this);
- if (e.propagationStopped)
- break;
- }
-
- if (defaultHandler && !e.defaultPrevented)
- return defaultHandler(e, this);
- };
- EventEmitter._signal = function(eventName, e) {
- var listeners = (this._eventRegistry || {})[eventName];
- if (!listeners)
- return;
- listeners = listeners.slice();
- for (var i=0; i<listeners.length; i++)
- listeners[i](e, this);
- };
- EventEmitter.once = function(eventName, callback) {
- var _self = this;
- callback && this.addEventListener(eventName, function newCallback() {
- _self.removeEventListener(eventName, newCallback);
- callback.apply(null, arguments);
- });
- };
- EventEmitter.setDefaultHandler = function(eventName, callback) {
- var handlers = this._defaultHandlers
- if (!handlers)
- handlers = this._defaultHandlers = {_disabled_: {}};
-
- if (handlers[eventName]) {
- var old = handlers[eventName];
- var disabled = handlers._disabled_[eventName];
- if (!disabled)
- handlers._disabled_[eventName] = disabled = [];
- disabled.push(old);
- var i = disabled.indexOf(callback);
- if (i != -1)
- disabled.splice(i, 1);
- }
- handlers[eventName] = callback;
- };
- EventEmitter.removeDefaultHandler = function(eventName, callback) {
- var handlers = this._defaultHandlers
- if (!handlers)
- return;
- var disabled = handlers._disabled_[eventName];
-
- if (handlers[eventName] == callback) {
- var old = handlers[eventName];
- if (disabled)
- this.setDefaultHandler(eventName, disabled.pop());
- } else if (disabled) {
- var i = disabled.indexOf(callback);
- if (i != -1)
- disabled.splice(i, 1);
- }
- };
- EventEmitter.on =
- EventEmitter.addEventListener = function(eventName, callback, capturing) {
- this._eventRegistry = this._eventRegistry || {};
- var listeners = this._eventRegistry[eventName];
- if (!listeners)
- listeners = this._eventRegistry[eventName] = [];
- if (listeners.indexOf(callback) == -1)
- listeners[capturing ? "unshift" : "push"](callback);
- return callback;
- };
- EventEmitter.off =
- EventEmitter.removeListener =
- EventEmitter.removeEventListener = function(eventName, callback) {
- this._eventRegistry = this._eventRegistry || {};
- var listeners = this._eventRegistry[eventName];
- if (!listeners)
- return;
- var index = listeners.indexOf(callback);
- if (index !== -1)
- listeners.splice(index, 1);
- };
- EventEmitter.removeAllListeners = function(eventName) {
- if (this._eventRegistry) this._eventRegistry[eventName] = [];
- };
- exports.EventEmitter = EventEmitter;
- });
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