<template>
  <el-dialog
    :visible.sync="pdfDialog"
    :close-on-click-modal="false"
    :close-on-press-escape="false"
    width="80%"
    :show-close="false"
    top="52px"
  >
    <p class="arrow">
      <el-button
        icon="el-icon-download"
        @click="download()"
        style="download"
        type="primary"
        size="mini"
        >下载</el-button
      >
      <span
        style="
          float: right;
          padding-right: 40px;
          font-size: 20px;
          color: rgb(223 227 234);
          cursor: pointer;
        "
        @click="handleClose"
      >
        <i style="font-size: 20px" class="el-icon-close"></i>
      </span>
    </p>
    <iframe
      :src="pdfSrc"
      style="width: 100%; border: 0"
      align="middle"
      :height="height"
    ></iframe>
  </el-dialog>
</template>

<script>
  import {Message} from 'element-ui'
  import req from '@/request.js'
  export default {
    name: 'pdf',
    props: ['src', 'fileRow'],
    data() {
      return {
        filesProps: {
          label: 'originName',
        },
        pdfDialog: false,
        currentPage: 0, // pdf文件页码
        pageCount: 0, // pdf文件总页数
        height: 800,
        fileType: 'pdf', // 文件类型
        pdfSrc: '',
      }
    },
    mounted() {
      this.height = document.documentElement.clientHeight - 80
    },
    watch: {
      src: function (newVal, oldVal) {
        if (newVal) {
          let _this = this
          req.get(this.src, 'arraybuffer').then((response) => {
            _this.pdfSrc = window.URL.createObjectURL(
              new Blob([response.data], {type: 'application/pdf'})
            )
          })
        }
      },
    },

    methods: {
      // 改变PDF页码,val传过来区分上一页下一页的值,0上一页,1下一页   $scope.src=+portal+$scope.data.pdfUrl;
      changePdfPage(val) {
        if (val === 0 && this.currentPage > 1) {
          this.currentPage--
        }
        if (val === 1 && this.currentPage < this.pageCount) {
          this.currentPage++
        }
      },
      // pdf加载时
      loadPdfHandler() {
        this.currentPage = 1 // 加载的时候先加载第一页
      },
      handleOpen() {
        this.pdfDialog = true
      },
      //关闭弹框,并且把附件列表的src变为默认""，否则watch无法一直监听第一个打开的预览文件，因为src不变
      handleClose() {
        this.pdfDialog = false
        this.$emit('changeSrc')
      },

      //附件下载
      download() {
        req.download(
          '${portal}/system/file/v1/downloadFile?fileId=' + this.fileRow.id
        )
      },
    },
  }
</script>

<style lang="scss" scoped>
  .currentPage {
    cursor: pointer;
    color: #8c8e92;
  }

  .currentPage:hover {
    color: #2761ff;
  }

  .arrow {
    position: fixed;
    top: 0px;
    z-index: 2;
    width: 100%;
    background-color: #191919;
    padding: 12px 0;
    margin: 0;
    text-align: center;
  }

  /deep/.el-dialog__body {
    height: calc(100% - 52px);
    color: #606266;
    font-size: 14px;
    padding: 0;
    padding-left: 30px;
  }

  /deep/.el-dialog {
    height: calc(100% - 52px);
    position: relative;
    margin: 0 auto 0;
    background: #fff;
    border-radius: 2px;
    -webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    width: 50%;
  }
</style>
