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

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* 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.
*
* $Id: file 64488 2006-03-10 17:32:09Z paulo $
*/

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, event || window.event);
            }
        }
    };
};

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

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

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

    this._listeners.remove(listener);

    var newLength = this._listeners.length;

    if (newLength >= length)
    {
        throw "There is not listener to remove";
    }
    /*this._listeners = this._listeners.reject(function(iter)
    {
        if (iter == listener)
        {
            found = true;
        }
        return iter == listener;
    });

    // Could I remove any listener ?
    if (!found)
    {
        throw "There is not listener to remove";
    }*/

};

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