flex游戏引擎（PushButton）-使用XML层格式存储游戏对象-3
?加载level文件

使用LevelManager加载文件， 并管理它，提供接口加载和卸载level文件，你可以覆盖一些接口。

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通过MXML加载

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1.<mx:Canvas xmlns:mx="http://www.adobe.com.2006/mxml" xmlns:pb="PBLabs.Engine.MXML.*"> 2.???<pb:LevelFileReference filename="..Assets/Levels/level.pbelevel" level="0" id="myLevelReference" /> 3.???<pb:GroupReference name="Managers" level="0" id="managerGroup" /> 4.???<pb:GroupReference name="SpriteSheets" level="0" id="spriteSheetsGroup" /> 5.???<pb:GroupReference name="Objects" level="0" id="objectsGroup" /> 6.???<pb:GroupReference name="Everything" level="0" id="everythingGroup" /> 7.</mx:Canvas> 当LevelManager加载层，4个组获得对象，被LevelFileReference 、GroupReference2个类共享的level属性不过是索引定义加载的文件或层的编号

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1.// 加载0层启动GAME

2.LevelManager.Instance.LoadLevel(0); 3.LevelManager.Instance.Start(); ??当0层加载后，对象创建，游戏启动， LevelManager 分发基于加载和卸载level文件的事件

01.// Add a listener to respond to level loaded event

02.LevelManager.Instance.addEventListener(LevelEvent.LEVEL_LOADED_EVENT, levelLoadedHandler, false, 0, true); 03.// Load level 0 and start game. 04.LevelManager.Instance.LoadLevel(0); 05.LevelManager.Instance.Start(); 06.private function levelLoadedHandler(event:LevelEvent):void 07.{ 08.???// level is loaded! 09.} 通过ActionScript加载与通过MXML相似

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01.// Add file and group references

02.LevelManager.Instance.AddFileReference(0, "../Assets/Levels/level.pbelevel"); 03.LevelManager.Instance.AddGroupReference(0, "Managers"); 04.LevelManager.Instance.AddGroupReference(0, "SpriteSheets"); 05.LevelManager.Instance.AddGroupReference(0, "Objects"); 06.LevelManager.Instance.AddGroupReference(0, "Everything"); 07.// Load level 0 and start game. 08.LoadManager.Instance.LoadLevel(0); 09.LoadManager.Instance.Start(); ?

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对XML的其他使用?

level文件和TemplateManager用来加载和实例XML数据，Serialization类可从XML中实例化，但建议使用TemplateManager

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完整TAG列表things: The root tag. template: A child of the root tag, specifying that the contained XML is a template definition. entity: A child of the root tag, specifying that the contained XML is an entity definition. group: A child of the root tag, specifying that the contained XML is a group definition. component: A child of the template or entity tag, specifying that the contained XML is a component definition. objectReference: A child of the group tag, specifying the name of a template or object to instantiate with the group. groupReference: A child of the group tag, specifying the name of a group to instantiate with the parent group. 完整属性列表name: On template tags, it specifies the name of the template. On entity tags, it specifies both the name of the entity in XML, and the name of the object that is instantiated from it. On group tags, it specifies the name of the group. On component tags, it specifies the name of the component once registered with its owning IEntity. On objectReference tags, it specifies the name of the template or entity to reference. On groupReference tags, it specifies the name of the group to reference. template: Exists on a template or entity tag and specifies the name of a template to inherit component definitions from. nameReference: Specifies the name of an entity to lookup and set on the tag. objectReference: Specifies the name of a template or entity to instantiate and set on the tag. entityName: Specifies the name of a template or entity to lookup and search for a compatible component to set on the tag. w: Specifies the name of a component to reference. If used without a componentReference attribute, the component is looked up on the same entity that this attribute is a part of. type: On a component, specifies the fully qualified type to use to instantiate the component. On a field, specifies the type to use when instantiating the field for the parent tag. childType: Specifies the type to use when instantiating objects to add to an array or dictionary. filename: For fields that hold resources, this lets you specify a file path. The field must be of a compatible type to the type of the resource as specified to the resource manager. The resource will be loaded and assigned to the field.