ant-design-vue/components/upload/UploadList.jsx

import BaseMixin from '../_util/BaseMixin'
import { getOptionProps, initDefaultProps } from '../_util/props-util'
import getTransitionProps from '../_util/getTransitionProps'
import Icon from '../icon'
import Tooltip from '../tooltip'
import Progress from '../progress'
import classNames from 'classnames'
import { UploadListProps } from './interface'

// https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readAsDataURL
const previewFile = (file, callback) => {
  const reader = new window.FileReader()
  reader.onloadend = () => callback(reader.result)
  reader.readAsDataURL(file)
}

const isImageUrl = (url) => {
  return /^data:image\//.test(url) || /\.(webp|svg|png|gif|jpg|jpeg)$/.test(url)
}

export default {
  name: 'AUploadList',
  mixins: [BaseMixin],
  props: initDefaultProps(UploadListProps, {
    listType: 'text', // or picture
    progressAttr: {
      strokeWidth: 2,
      showInfo: false,
    },
    prefixCls: 'ant-upload',
    showRemoveIcon: true,
    showPreviewIcon: true,
  }),
  updated () {
    this.$nextTick(() => {
      if (this.listType !== 'picture' && this.listType !== 'picture-card') {
        return
      }
      (this.items || []).forEach(file => {
        if (typeof document === 'undefined' ||
            typeof window === 'undefined' ||
            !window.FileReader || !window.File ||
            !(file.originFileObj instanceof window.File) ||
            file.thumbUrl !== undefined) {
          return
        }
        /*eslint-disable */
        file.thumbUrl = '';
        /*eslint -enable */
        previewFile(file.originFileObj, (previewDataUrl) => {
          /*eslint-disable */
          file.thumbUrl = previewDataUrl;
          /*eslint -enable todo */
          // this.forceUpdate()
        })
      })
    })
  },
  methods: {
    handleClose (file) {
      this.$emit('remove', file)
    },
    handlePreview (file, e) {
      e.preventDefault()
      return this.$emit('preview', file)
    },
  },
  render () {
    const { prefixCls, items = [], listType, showPreviewIcon, showRemoveIcon, locale } = getOptionProps(this)
    const list = items.map(file => {
      let progress
      let icon = <Icon type={file.status === 'uploading' ? 'loading' : 'paper-clip'} />

      if (listType === 'picture' || listType === 'picture-card') {
        if (listType === 'picture-card' && file.status === 'uploading') {
          icon = <div class={`${prefixCls}-list-item-uploading-text`}>{locale.uploading}</div>
        } else if (!file.thumbUrl && !file.url) {
          icon = <Icon class={`${prefixCls}-list-item-thumbnail`} type='picture' />
        } else {
          const thumbnail = isImageUrl(file.thumbUrl || file.url) ? (
            <img src={file.thumbUrl || file.url} alt={file.name} />
          ) : (
            <Icon
              type='file'
              style={{ fontSize: '48px', color: 'rgba(0,0,0,0.5)' }}
            />
          )
          icon = (
            <a
              class={`${prefixCls}-list-item-thumbnail`}
              onClick={e => this.handlePreview(file, e)}
              href={file.url || file.thumbUrl}
              target='_blank'
              rel='noopener noreferrer'
            >
              {thumbnail}
            </a>
          )
        }
      }

      if (file.status === 'uploading') {
        const progressProps = {
          props: {
            ...this.progressAttr,
            type: 'line',
            percent: file.percent,
          }
        }
        // show loading icon if upload progress listener is disabled
        const loadingProgress = ('percent' in file) ? (
          <Progress {...progressProps} />
        ) : null

        progress = (
          <div class={`${prefixCls}-list-item-progress`} key='progress'>
            {loadingProgress}
          </div>
        )
      }
      const infoUploadingClass = classNames({
        [`${prefixCls}-list-item`]: true,
        [`${prefixCls}-list-item-${file.status}`]: true,
      })
      const preview = file.url ? (
        <a
          {...file.linkProps}
          href={file.url}
          target='_blank'
          rel='noopener noreferrer'
          class={`${prefixCls}-list-item-name`}
          onClick={e => this.handlePreview(file, e)}
          title={file.name}
        >
          {file.name}
        </a>
      ) : (
        <span
          class={`${prefixCls}-list-item-name`}
          onClick={e => this.handlePreview(file, e)}
          title={file.name}
        >
          {file.name}
        </span>
      )
      const style = (file.url || file.thumbUrl) ? undefined : {
        pointerEvents: 'none',
        opacity: 0.5,
      }
      const previewIcon = showPreviewIcon ? (
        <a
          href={file.url || file.thumbUrl}
          target='_blank'
          rel='noopener noreferrer'
          style={style}
          onClick={e => this.handlePreview(file, e)}
          title={locale.previewFile}
        >
          <Icon type='eye-o' />
        </a>
      ) : null
      const iconProps = {
        props: {
          type: 'delete',
          title: locale.removeFile,
        },
        on: {
          click: () => {
            this.handleClose(file)
          }
        },
      }
      const iconProps1 = {...iconProps, ...{props: {type: 'cross'}}}
      const removeIcon = showRemoveIcon ? (
        <Icon {...iconProps} />
      ) : null
      const removeIconCross = showRemoveIcon ? (
        <Icon {...iconProps1}/>
      ) : null
      const actions = (listType === 'picture-card' && file.status !== 'uploading')
        ? <span class={`${prefixCls}-list-item-actions`}>{previewIcon}{removeIcon}</span>
        : removeIconCross
      let message
      if (file.response && typeof file.response === 'string') {
        message = file.response
      } else {
        message = (file.error && file.error.statusText) || locale.uploadError
      }
      const iconAndPreview = (file.status === 'error')
        ? <Tooltip title={message}>{icon}{preview}</Tooltip>
        : <span>{icon}{preview}</span>
      const transitionProps = getTransitionProps('fade')
      return (
        <div class={infoUploadingClass} key={file.uid}>
          <div class={`${prefixCls}-list-item-info`}>
            {iconAndPreview}
          </div>
          {actions}
          <transition {...transitionProps}>
            {progress}
          </transition>
        </div>
      )
    })
    const listClassNames = classNames({
      [`${prefixCls}-list`]: true,
      [`${prefixCls}-list-${listType}`]: true,
    })
    const animationDirection =
      listType === 'picture-card' ? 'animate-inline' : 'animate'
    const transitionGroupProps = getTransitionProps(`${prefixCls}-${animationDirection}`)
    return (
      <transition-group
        {...transitionGroupProps}
        tag='div'
        class={listClassNames}
      >
        {list}
      </transition-group>
    )
  },
}