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67 lines
2.2 KiB
67 lines
2.2 KiB
import ResLoadItem from "./ResLoadItem";
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/**
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* 资源加载组
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* 负责多个资源加载项的统一加载
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*/
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export default class ResLoadGroup {
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/**
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* 加载资源列表集合
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* ! 这里是依次加载并不是同时加载的
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* @param items 资源加载项集合
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* @param onCompleted 完成时回调
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* @param _onProgress 加载进度回调
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* @param _onItemCom 单个资源项加载完成回调，会带上该资源项实例作为参数
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*/
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public static load(items: ResLoadItem[], onCompleted: Function, _onProgress?: Function, _onItemCom?: Function) {
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//没有加载项
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if (items.length == 0) {
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//加载完成
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onCompleted();
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if (_onProgress) {_onProgress(1);}
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return;
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}
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//浅拷贝，防止污染源列表
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items = [...items];
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//异步列表长度
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let _length: number = items.length;
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//一步一步消费异步列表
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let _f: Function = () => {
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if (items.length > 0) {
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let onItem: ResLoadItem = items.shift();
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let lamuda = (i) => {
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//传出总进度
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_onProgress(((_length - items.length - 1) + i) / _length,_length);
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};
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onItem.loadAsync(lamuda.bind(this)).then(() => {
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//传出单个加载项加载完成事件
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_onItemCom(onItem);
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_f();
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});
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} else {
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//加载完成
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onCompleted();
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}
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}
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//执行递归加载方法
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_f();//归加载方法
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}
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/**
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* 异步加载资源列表集合
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* @param items 资源加载项集合
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* @param _onProgress 加载进度回调
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* @param _onItemCom 单个资源项加载完成回调，会带上该资源项实例参数
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*/
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public static loadAsync(items: ResLoadItem[], _onProgress?: Function, _onItemCom?: Function): Promise<void> {
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return new Promise<void>((r) => {
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let Lamuda = () => {
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r();
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};
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this.load(items, Lamuda.bind(this), _onProgress, _onItemCom);
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});
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}
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}
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