75 lines
2.1 KiB
JavaScript
75 lines
2.1 KiB
JavaScript
/**
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* @fileOverview 图片操作, 负责预览图片和上传前压缩图片
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*/
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define([
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'../base',
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'../uploader',
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'../lib/md5',
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'../lib/blob',
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'./widget'
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], function( Base, Uploader, Md5, Blob ) {
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return Uploader.register({
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name: 'md5',
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/**
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* 计算文件 md5 值，返回一个 promise 对象，可以监听 progress 进度。
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*
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*
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* @method md5File
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* @grammar md5File( file[, start[, end]] ) => promise
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* @for Uploader
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* @example
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*
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* uploader.on( 'fileQueued', function( file ) {
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* var $li = ...;
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*
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* uploader.md5File( file )
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*
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* // 及时显示进度
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* .progress(function(percentage) {
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* console.log('Percentage:', percentage);
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* })
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*
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* // 完成
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* .then(function(val) {
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* console.log('md5 result:', val);
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* });
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*
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* });
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*/
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md5File: function( file, start, end ) {
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var md5 = new Md5(),
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deferred = Base.Deferred(),
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blob = (file instanceof Blob) ? file :
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this.request( 'get-file', file ).source;
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md5.on( 'progress load', function( e ) {
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e = e || {};
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deferred.notify( e.total ? e.loaded / e.total : 1 );
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});
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md5.on( 'complete', function() {
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deferred.resolve( md5.getResult() );
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});
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md5.on( 'error', function( reason ) {
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deferred.reject( reason );
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});
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if ( arguments.length > 1 ) {
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start = start || 0;
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end = end || 0;
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start < 0 && (start = blob.size + start);
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end < 0 && (end = blob.size + end);
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end = Math.min( end, blob.size );
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blob = blob.slice( start, end );
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}
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md5.loadFromBlob( blob );
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return deferred.promise();
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}
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});
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}); |