events.js

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/*
* Copyright 2001-2007 Hippo (www.hippo.nl)
*
* Licensed 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.
*/
function EventManager() {

  if ( !Cfx.Class.IsDefined( EventManager ) ) {
    Cfx.Class.New( EventManager );
    if ( Cfx.Class.IsInitializing( EventManager ) )	{
      EventManager.Method( addEventListener );
      EventManager.Method( removeEventListener );
      EventManager.Method( fireEvent );
      return;
    }
  }

  this.InitInstance();
  if (arguments.length ) {
    this.log = arguments[0];
    if (this.log.debugging()) {
      this.log.debug("instantiated");
    }
  }
  this.listeners = new Array();
  return this;

  function addEventListener(obj) {
    this.listeners.push(obj); 
  }
  
  function removeEventListener(obj) {
    this.listeners.pop(obj); 
  }
  
  function fireEvent(evt, params) {
    if (this.log.debugging()) {
      this.log.debug("Firing event: " + evt);
    }
    for (var i=0; i<this.listeners.length; i++) {
      var func = this.listeners[i][evt];
      if (func != undefined) {
  	   	if (this.log.debugging()) {
          this.log.debug("notifying object '" + this.listeners[i].getId() + "' of event " + evt);
        }
        func.call(this.listeners[i], params);
      }
    }
  }
}