wisemapping-open-source/web2d/src/main/javascript/EventDispatcher.js

/*
 *    Copyright [2011] [wisemapping]
 *
 *   Licensed under WiseMapping Public License, Version 1.0 (the "License").
 *   It is basically the Apache License, Version 2.0 (the "License") plus the
 *   "powered by wisemapping" text requirement on every single page;
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the license at
 *
 *       http://www.wisemapping.org/license
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

web2d.EventDispatcher = function(element) {
    this._listeners = [];
    var dispatcher = this;

    this.eventListener = function(event) {
        for (var i = 0; i < dispatcher._listeners.length; i++) {
            if (dispatcher._listeners[i] != null) {
                dispatcher._listeners[i].call(element, new Event(event) || new Event(window.event));
            }
        }
    };
};

web2d.EventDispatcher.prototype.addListener = function(type, listener) {
    if (!$defined(listener)) {
        throw "Listener can not be null.";
    }
    this._listeners.include(listener);
};

web2d.EventDispatcher.prototype.removeListener = function(type, listener) {
    if (!$defined(listener)) {
        throw "Listener can not be null.";
    }

    //    var found = false;
    var length = this._listeners.length;

    this._listeners.erase(listener);

    var newLength = this._listeners.length;

    if (newLength >= length) {
        throw "There is not listener to remove";
    }
};

web2d.EventDispatcher.prototype.getListenersCount = function() {
    return this._listeners.length;
};