2011年4月25日 星期一

避免重複程式碼:flash/flex開發中對於遠端處理常用偵聽式提出

package com.loaderProxy
{
 import flash.events.Event;
 import flash.events.EventDispatcher;
 import flash.events.HTTPStatusEvent;
 import flash.events.IEventDispatcher;
 import flash.events.IOErrorEvent;
 import flash.events.ProgressEvent;
 import flash.events.SecurityErrorEvent;
 public class EventListenerProxy extends EventDispatcher
 {
  public function EventListenerProxy(target:IEventDispatcher=null)
  {
   super(target);
  }  
  //event handel method
  public var completeHandler:Function = function(event:Event):void {};
  public var openHandler:Function = function(event:Event):void{};
  public var progressHandler:Function = function(event:ProgressEvent):void{};
  public var securityErrorHandler:Function = function(event:SecurityErrorEvent):void{};
  public var httpStatusHandler:Function = function(event:HTTPStatusEvent):void{};
  public var ioErrorHandler:Function = function(event:IOErrorEvent):void{};
  public function addLoaderEventListener(target:IEventDispatcher):void
  {
   addEventListenerProxy(target , Event.COMPLETE ,completeHandler);
   addEventListenerProxy(target , Event.OPEN, openHandler);
   addEventListenerProxy(target , ProgressEvent.PROGRESS, progressHandler);
   addEventListenerProxy(target , SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);
   addEventListenerProxy(target , HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);
   addEventListenerProxy(target , IOErrorEvent.IO_ERROR, ioErrorHandler);
  }

  public function removeLoaderEventListener(target:IEventDispatcher):void
  {
   removeEventListenerProxy(target , Event.COMPLETE ,completeHandler);
   removeEventListenerProxy(target , Event.OPEN, openHandler);
   removeEventListenerProxy(target , ProgressEvent.PROGRESS, progressHandler);
   removeEventListenerProxy(target , SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);
   removeEventListenerProxy(target , HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);
   removeEventListenerProxy(target , IOErrorEvent.IO_ERROR, ioErrorHandler);
  }
  //EventListener Proxy
  public function addEventListenerProxy(target:IEventDispatcher , type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
  {
    target.addEventListener(type, listener, useCapture, priority, useWeakReference);

  }
  public function removeEventListenerProxy(target:IEventDispatcher , type:String, listener:Function, useCapture:Boolean = false):void
  {
   target.removeEventListener(type , listener , useCapture );
  }
 }
}
而更好的話將event handel method所有的method宣告到一個Interface,如此若是需要不同動作處理者,可實作該Interface來實現。

因此可以:
public var handel:IHandelMethod  = new LoaderHandelMethod();

addEventListenerProxy(target , Event.COMPLETE ,handel.completeHandler);
如此程式碼可以簡化並能鬆綁個物件間之關係

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