简单的加载管理类

 从sandy引擎拿出来的加载管理类，用于加载swf ，图片 或者二进制的文件，这个类的用法比较简单，而且在某一些情况下还是很实用的。

这个类的做法，是采用obeject作为一个动态数组存取一个类对象。

而这个类有一个特别的地方：类只有属性，并没有方法体

 import flash.display.Loader; import flash.net.URLLoader; import flash.net.URLRequest; internal class QueueElement { public var name:String; public var loader:Loader; public var urlLoader:URLLoader; public var urlRequest:URLRequest; // -- public function QueueElement( p_sName:String, p_oLoader:Loader, u_oLoader:URLLoader ,p_oURLRequest : URLRequest ) { name = p_sName; loader = p_oLoader; urlRequest = p_oURLRequest; urlLoader = u_oLoader; } }

这种方式，也是我们比较常见一种写法，他就好像c++ 结构体差不多。引用他的方式 也很简单。通过创建类对象，从而他的属性也可以被引用了。

下面是完整的类：至于事件，我们从新写过一次吧，至于用法呢：呵呵，看sandy 引擎的例子吧

 package { import flash.display.Loader; import flash.display.LoaderInfo; import flash.events.Event; import flash.events.EventDispatcher; import flash.events.IOErrorEvent; import flash.net.URLLoader; import flash.net.URLLoaderDataFormat; import flash.net.URLRequest; import flash.utils.Dictionary; import flash.utils.getQualifiedClassName; /** * Dispatched when all resources have been loaded. * * @eventType sandy.events.QueueEvent.QUEUE_COMPLETE */ [Event(name="queueComplete", type="sandy.events.QueueEvent")] /** * Dispatched when a resource has been loaded. * * @eventType sandy.events.QueueEvent.QUEUE_RESOURCE_LOADED */ [Event(name="queueResourceLoaded", type="sandy.events.QueueEvent")] /** * Dispatched when an error is encountered while loading a resource. * * @eventType sandy.events.QueueEvent.QUEUE_LOADER_ERROR */ [Event(name="queueLoaderError", type="sandy.events.QueueEvent")] /** * Utility class for loading resources. * * <p>A LoaderQueue allows you to queue up requests for loading external resources.</p> * * @author Thomas Pfeiffer - kiroukou /Max Pellizzaro * @version 3.1 * @date 07.16.2008 */ public class LoaderQueue extends EventDispatcher { /** * Specifies the Image type of object to load */ public static const IMG:String = "IMG"; /** * Specifies the SWF type of object to load */ public static const SWF:String = "SWF"; /** * Specifies the Binary type of object to load */ public static const BIN:String = "BIN"; private var m_oLoaders : Object; private var m_nLoaders : int; private var m_oQueueCompleteEvent : QueueEvent; private var m_oQueueResourceLoadedEvent : QueueEvent; private var m_oQueueLoaderError : QueueEvent; /** * A list of all resources indexed by their names. */ public var data:Dictionary = new Dictionary( true ); public var clips:Dictionary = new Dictionary( true ); /** * Creates a new loader queue. */ public function LoaderQueue() { m_oLoaders = new Object(); m_oQueueCompleteEvent = new QueueEvent ( QueueEvent.QUEUE_COMPLETE ); m_oQueueResourceLoadedEvent = new QueueEvent ( QueueEvent.QUEUE_RESOURCE_LOADED ); m_oQueueLoaderError = new QueueEvent ( QueueEvent.QUEUE_LOADER_ERROR ); } /** * Adds a new request to this loader queue. * * <p>The request is given its own loader and is added to a loader queue<br/> * The loading is postponed until the start method of the queue is called.</p> * * @param p_sID A string identifier for this request * @param p_oURLRequest The request */ public function add( p_sID : String, p_oURLRequest : URLRequest, type:String = "IMG" ) : void { if(type == "BIN"){ var tmpLoader:URLLoader = new URLLoader (); tmpLoader.dataFormat = URLLoaderDataFormat.BINARY; m_oLoaders[ p_sID ] = new QueueElement( p_sID, null, tmpLoader, p_oURLRequest ); } else { m_oLoaders[ p_sID ] = new QueueElement( p_sID, new Loader(), null, p_oURLRequest ); } // -- m_nLoaders++; } private function getIDFromLoader( p_oLoader:Loader):String { for each( var l_oElement:QueueElement in m_oLoaders ) { if( p_oLoader == l_oElement.loader) { return l_oElement.name; } } return null; } private function getIDFromURLLoader( p_oLoader:URLLoader ):String { for each( var l_oElement:QueueElement in m_oLoaders ) { if( p_oLoader == l_oElement.urlLoader ) { return l_oElement.name; } } return null; } /** * Starts the loading of all resources in the queue. * * <p>All loaders in the queue are started and IOErrorEvent and the COMPLETE event are subscribed to.</p> */ public function start() : void { var noLoaders:Boolean = true; for each( var l_oLoader:QueueElement in m_oLoaders ) { noLoaders = false; if (l_oLoader.loader != null) { l_oLoader.loader.load( l_oLoader.urlRequest ); l_oLoader.loader.contentLoaderInfo.addEventListener( Event.COMPLETE, completeHandler ); l_oLoader.loader.contentLoaderInfo.addEventListener( IOErrorEvent.IO_ERROR, ioErrorHandler ); } else { l_oLoader.urlLoader.load( l_oLoader.urlRequest ); l_oLoader.urlLoader.addEventListener( Event.COMPLETE, completeHandler ); l_oLoader.urlLoader.addEventListener( IOErrorEvent.IO_ERROR, ioErrorHandler ); } } if (noLoaders) { // still need to dispatch complete event m_oQueueCompleteEvent.loaders = m_oLoaders; dispatchEvent( m_oQueueCompleteEvent ); } } /** * Fires a QUEUE_RESOURCE_LOADED, for each resources that is loaded. * Fires a single QUEUE_COMPLETE, after the last resources is loaded. * Type QUEUE_COMPLETE */ private function completeHandler( p_oEvent:Event ) : void { var l_sName:String; var l_oLoaderInfos:LoaderInfo = p_oEvent.target as LoaderInfo; // Fire an event to indicate that a single resource loading was completed (needs to be enhanced to provide more info) dispatchEvent( m_oQueueResourceLoadedEvent ); if (getQualifiedClassName(p_oEvent.target) == "flash.net::URLLoader"){ var l_oLoader:URLLoader = URLLoader(p_oEvent.target); l_sName = getIDFromURLLoader(l_oLoader ); data[ l_sName ] = l_oLoader.data; clips[ l_sName ] = l_oLoaderInfos; } else{ var l_oLoader01:Loader = l_oLoaderInfos.loader; l_sName = getIDFromLoader( l_oLoader01 ); data[ l_sName ] = l_oLoaderInfos.content; clips[ l_sName ] = l_oLoaderInfos; } m_nLoaders--; // -- if( m_nLoaders == 0 ) { m_oQueueCompleteEvent.loaders = m_oLoaders; dispatchEvent( m_oQueueCompleteEvent ); } } /** * Fires an error event if any of the loaders didn't succeed * */ private function ioErrorHandler( p_oEvent : IOErrorEvent ) : void { trace( "LoaderQueue.ioErrorHandler: " + p_oEvent.text ); // Fire an event to indicate that a single resource loading failed (needs to be enhanced to provide more info) dispatchEvent( m_oQueueLoaderError ); m_nLoaders--; if( m_nLoaders == 0 ) { m_oQueueCompleteEvent.loaders = m_oLoaders; dispatchEvent( m_oQueueCompleteEvent ); } } } } import flash.display.Loader; import flash.net.URLLoader; import flash.net.URLRequest; internal class QueueElement { public var name:String; public var loader:Loader; public var urlLoader:URLLoader; public var urlRequest:URLRequest; // -- public function QueueElement( p_sName:String, p_oLoader:Loader, u_oLoader:URLLoader ,p_oURLRequest : URLRequest ) { name = p_sName; loader = p_oLoader; urlRequest = p_oURLRequest; urlLoader = u_oLoader; } }