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234 lines
7.1 KiB
234 lines
7.1 KiB
3 years ago
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<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<base href="../../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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<h1>[name]</h1>
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<p class="desc">
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其功能是处理并跟踪已加载和待处理的数据。如果未手动设置加强管理器，则会为加载器创建和使用默认全局实例加载器管理器
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- 请参阅 [page:DefaultLoadingManager].<br /><br />
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一般来说，默认的加载管理器已足够使用了，但有时候也需要设置单独的加载器 - 例如，如果你想为对象和纹理显示单独的加载条。
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</p>
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<h2>代码示例</h2>
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<p>
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下面的例子将介绍，如何使用加载管理器来跟踪 [page:OBJLoader] 的加载进度流程。
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</p>
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<code>
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const manager = new THREE.LoadingManager();
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manager.onStart = function ( url, itemsLoaded, itemsTotal ) {
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console.log( 'Started loading file: ' + url + '.\nLoaded ' + itemsLoaded + ' of ' + itemsTotal + ' files.' );
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};
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manager.onLoad = function ( ) {
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console.log( 'Loading complete!');
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};
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manager.onProgress = function ( url, itemsLoaded, itemsTotal ) {
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console.log( 'Loading file: ' + url + '.\nLoaded ' + itemsLoaded + ' of ' + itemsTotal + ' files.' );
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};
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manager.onError = function ( url ) {
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console.log( 'There was an error loading ' + url );
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};
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const loader = new THREE.OBJLoader( manager );
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loader.load( 'file.obj', function ( object ) {
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//
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} );
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</code>
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<p>
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除了观察进度流程之外，还可以使用LoadingManager在加载期间覆写资源URL。当某资源来自拖拽事件、
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WebSockets、WebRTC或其他API时，此方法可以有所帮助。下面显示了如何使用Blob URL加载内存模型的示例。
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</p>
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<code>
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// 将文件拖入网页时创建的Blob或File对象。
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const blobs = {'fish.gltf': blob1, 'diffuse.png': blob2, 'normal.png': blob3};
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const manager = new THREE.LoadingManager();
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// 使用URL回调初始化加载管理器。
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const objectURLs = [];
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manager.setURLModifier( ( url ) => {
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url = URL.createObjectURL( blobs[ url ] );
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objectURLs.push( url );
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return url;
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} );
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// 像通常一样加载，然后撤消blob URL
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const loader = new THREE.GLTFLoader( manager );
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loader.load( 'fish.gltf', (gltf) => {
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scene.add( gltf.scene );
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objectURLs.forEach( ( url ) => URL.revokeObjectURL( url ) );
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});
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</code>
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<h2>例子</h2>
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<p>
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[example:webgl_loader_fbx WebGL / loader / fbx]<br />
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[example:webgl_loader_obj WebGL / loader / obj]<br />
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[example:webgl_materials_physical_reflectivity WebGL / materials / physical / reflectivity]<br />
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[example:webgl_postprocessing_outline WebGL / postprocesing / outline]
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</p>
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<h2>构造方法</h2>
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<h3>[name]( [param:Function onLoad], [param:Function onProgress], [param:Function onError] )</h3>
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<p>
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[page:Function onLoad] — (可选) 所有加载器加载完成后，将调用此函数。<br />
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[page:Function onProgress] — (可选) 当每个项目完成后，将调用此函数。<br />
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[page:Function onError] — (可选) 当一个加载器遇到错误时，将调用此函数。 <br />
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创建一个新的 [name].
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</p>
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<h2>属性</h2>
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<h3>[property:Function onStart]</h3>
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<p>
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此函数在加载开始时被调用。
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有如下参数：<br />
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[page:String url] — 被加载的项的url。<br />
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[page:Integer itemsLoaded] — 目前已加载项的个数。<br />
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[page:Integer itemsTotal] — 总共所需要加载项的个数。<br /><br />
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该函数默认为undefined。
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</p>
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<h3>[property:Function onLoad]</h3>
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<p>
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所有的项目加载完成后将调用此函数。默认情况下，该函数是未定义的，除非在构造函数中传入。
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</p>
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<h3>[property:Function onProgress]</h3>
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<p>
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此方法加载每一个项，加载完成时进行调用。
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有如下参数：<br />
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[page:String url] — 被加载的项的url。<br />
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[page:Integer itemsLoaded] — 目前已加载项的个数。<br />
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[page:Integer itemsTotal] — 总共所需要加载项的个数。<br /><br />
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默认情况下，该函数为undefined，除非在构造函数中传入。
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</p>
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<h3>[property:Function onError]</h3>
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<p>
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此方法将在任意项加载错误时，进行调用。
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有如下参数：<br />
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[page:String url] — 加载发生错误的项目的url<br /><br />
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默认情况下，该函数为undefined，除非在构造函数中传入。
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</p>
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<h2>方法</h2>
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<h3>[method:this addHandler]( [param:Object regex], [param:Loader loader] )</h3>
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<p>
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[page:Object regex] — A regular expression.<br />
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[page:Loader loader] — The loader.
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<p>
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Registers a loader with the given regular expression. Can be used to define what loader should be used in
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order to load specific files. A typical use case is to overwrite the default loader for textures.
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</p>
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<code>
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// add handler for TGA textures
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manager.addHandler( /\.tga$/i, new TGALoader() );
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</code>
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<h3>[method:Loader getHandler]( [param:String file] )</h3>
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<p>
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[page:String file] — The file path.
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<p>
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Can be used to retrieve the registered loader for the given file path.
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</p>
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<h3>[method:this removeHandler]( [param:Object regex] )</h3>
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<p>
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[page:Object regex] — A regular expression.
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<p>
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Removes the loader for the given regular expression.
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</p>
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<h3>[method:String resolveURL]( [param:String url] )</h3>
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<p>
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[page:String url] — 所要加载的url<br /><br />
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给定URL，使用URL修饰符回调（如果有）并返回已解析的URL。如果未设置URL修饰符，则返回原始URL。
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</p>
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<h3>[method:this setURLModifier]( [param:Function callback] )</h3>
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<p>
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[page:Function callback] — 设置URL修饰符成功时回调。使用url参数进行回调，并且必须返回 [page:String resolvedURL] 。<br /><br />
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如果设置了回调，则在发送请求之前将向每个资源URL传递回调。回调可以返回最初的URL，也可以返回新URL以覆盖加载行为。
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此行为可用于从.ZIP、拖拽API和数据URI中加载资源文件。
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</p>
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<br />
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<p>
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<em>Note: The following methods are designed to be called internally by loaders. You shouldn't call
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them directly.</em>
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</p>
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<h3>[method:undefined itemStart]( [param:String url] )</h3>
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<p>
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[page:String url] — 所要加载的url<br /><br />
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任何使用管理器的加载器都会调用此方法， 当加载器需要开始加载URL时。
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</p>
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<h3>[method:undefined itemEnd]( [param:String url] )</h3>
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<p>
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[page:String url] — 所要加载的url<br /><br />
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任何使用管理器的加载器都会调用此方法， 当加载器需要加载URL结束时。
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</p>
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<h3>[method:undefined itemError]( [param:String url] )</h3>
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<p>
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[page:String url] — 所要加载的url<br /><br />
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任何使用管理器的加载器都会调用此方法， 当加载器出现加载错误时。
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</p>
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<h2>源</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/src/loaders/LoadingManager.js src/loaders/LoadingManager.js]
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</p>
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</body>
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</html>
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