Scratch3.0初始化加载七牛云上的sbs文件的方法
下面通过代码介绍下Scratch3.0初始化加载七牛云上的sbs文件,代码如下所示:
编写组件
import PropTypes from 'prop-types'; import React from 'react'; import {connect} from 'react-redux'; import {injectIntl, intlShape} from 'react-intl'; import analytics from '../lib/analytics'; import log from '../lib/log'; import {LoadingStates, onLoadedProject, onProjectUploadStarted} from '../reducers/project-state'; import {openLoadingProject,closeLoadingProject} from '../reducers/modals'; /** 获取作品的编号 **/ function getProjectId() { if(document.getElementById("projectId")){ return $("#projectId").val(); } else { alert("sb3-downloader-qiniu.jsx文件提示:页面不存在id属性为projectId的对象!"); return null; } } /** * 从七牛云加载sb3文件 */ class SB3DownloaderQiniu extends React.Component { constructor (props) { super(props); } componentDidMount() { var _this = this; if(getProjectId()==null){ return; } // 作品所在存放地址 var sb3Path = null; $.ajax({ dataType:"json", async:false, url:"/project/checkProjectByProjectId", data: {id: getProjectId()}, success:function(res){ if(res.success==true){ sb3Path = res.sb3Path; } } }); /** * 必须使用 $(window).on("load",function(){}); * 否则页面在未加载完的情况下,有些组件会来不及加载,影响二次文件保存 */ $(window).on("load",function(){ let reader = new FileReader(); let request = new XMLHttpRequest(); request.open('GET', sb3Path, true); request.responseType = "blob"; request.onload = function() { if(request.status==404){ alert("未找到sb3类型的资源文件"); location.href='/scratch'; } let blobs = request.response reader.readAsArrayBuffer(blobs); reader.onload = () => _this.props.vm.loadProject(reader.result).then(() => { analytics.event({ category: 'project', action: 'Import Project File', nonInteraction: true }); _this.props.onLoadingFinished(_this.props.loadingState); }).catch(error => { log.warn(error); }); } request.send(); }); } render () { return this.props.children(this.props.className); } } SB3DownloaderQiniu.propTypes = { children: PropTypes.func, className: PropTypes.string, intl: intlShape.isRequired, loadingState: PropTypes.oneOf(LoadingStates), onLoadingFinished: PropTypes.func, vm: PropTypes.shape({ loadProject: PropTypes.func }) }; SB3DownloaderQiniu.defaultProps = { className: '' }; const mapStateToProps = state => ({ loadingState: state.scratchGui.projectState.loadingState, vm: state.scratchGui.vm }); const mapDispatchToProps = (dispatch, ownProps) => ({ onLoadingFinished: loadingState => { console.dir("sb3文件加载完毕!"); dispatch(onLoadedProject(loadingState, ownProps.canSave)); dispatch(closeLoadingProject()); } }); // Allow incoming props to override redux-provided props. Used to mock in tests. const mergeProps = (stateProps, dispatchProps, ownProps) => Object.assign( {}, stateProps, dispatchProps, ownProps ); export default connect( mapStateToProps, mapDispatchToProps, mergeProps )(injectIntl(SB3DownloaderQiniu));
使用组件
<SB3DownloaderQiniu /** 初始化加载文件到项目 **/> {(className, loadProject) => ( <button onClick={loadProject} className={classNames(styles.scratchHide)}></button> )} </SB3DownloaderQiniu>
好了,下面看下如何自动加载scratch3.0的页面上实现自动加载原有的作品
首先,我们在安装scratch3。0后,浏览器默认打开的是编程的页面。如下图:
那么我们希望开发一个功能,就是打开的时候默认加入某一个SB3的开发文件
1.首先,我们需要有一个.SB3的开发文件,建议上传到STATIC目录下
2、找到scratch-gui-develop>src>container》gui.jsx文件
找到44行的componentDidMount函数
新增以下代码
const url="/static/123.sb3"; fetch(url,{ method: 'GET' }) .then(response=>response.blob()) .then(blob=>{ const reader=new FileReader(); reader.onload=()=>this.props.vm.loadProject(reader.result) .then(()=>{ GoogleAnalytics.event({ category:'project', action:'Import Project File', nonInteraction:true }) }) reader.readAsArrayBuffer(blob) }) .catch(error=>{ alert(`远程加载文件错误!${error}`) })
文件加载完毕
此外,我们例如希望开发像修改作业之类的,我们可以需要进行文件的传递
我们需要将上面的第一行
consturl="/static/123.sb3";
更改为
consturl=window.projecturl;
然后呢。在首页,例如paly.html添加上以上代码,或者自己用参数来传递
<script> window.projectUrl="https://steam.nosdn.127.net/885318eb-ad83-44c4-afe3-d3bea0a0d2ab.sb3"; </script>
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