emis-frontend/src/components/PdfViewer/viewer.vue

<template>
  <!-- v-if="pdfUrl" -->
  <div class="pdf-viewer grid2" >
    <div style="position: relative;">
      <div class="pdf-bar">
        <div class="zoom-minus" @click="zoomIn">
          <i class="el-icon-minus" title="缩小"></i>
        </div>
        <div class="scale" >
          <el-input v-model.number="scale" size="mini" @keyup.enter.native="setScaleValue">
            <template slot="append">%</template>
          </el-input>
        </div>
        <div class="zoom-plus" @click="zoomOut">
          <i class="el-icon-plus" title="放大"></i>
        </div>
        <div class="prev" @click="preFile">
          上一页
        </div>
        <div class="page">
          <el-input-number
            v-model.number="currentNum"
            :min="0"
            :max="fileCount"
            size="mini"
          />
        </div>
        <div class="page-count">/ {{ fileCount }}</div>
        <div class="next" @click="nextFile">
          下一页
        </div>
        <div class="tools">
          <div style="width:100%;text-align: right;">
            <el-button title="下载" type="primary" icon="el-icon-download"   @click="downPDF">下载</el-button>
            <el-button title="打印" type="primary" icon="el-icon-printer"   @click="printPDF">打印</el-button>
          </div>
        </div>
      </div>
      <div style="min-height:1600px;margin: 0 auto;overflow: auto;">
          <div class="pdf-wrapper">
            <!-- v-for="item in pdfList"
                    :key="item.billCode"
                    :src="item.pdfUrl" -->
                  <pdf
                    :src="currentPdfUrl"
                    :page="page"
                    @num-pages="pageCount = $event"
                    @page-loaded="onPageLoaded($event)"
                    ref="pdf"

                  ></pdf>

                  <!-- v-drag -->
          </div>
      </div>
    </div>
  </div>
</template>
<script>
import pdf from 'vue-pdf'
export default {
  components: { pdf },
  props: {
    pdfList:{
      type: Array,
    },
    startPage: {
      type: Number,
      default: 1
    }
  },
  data() {
    return {

      cacheFileList:this.pdfList,
      loadPdfUrl:null,
      page: 1,
      currentPage: 0,
      pageCount: 0,

      currentNum:1,
      fileCount: this.pdfList.length,

      scale: 20,
      preScale: 20,

    }
  },
  computed: {
    currentPdfUrl() {
      if (!this.loadPdfUrl) return ''
      const publicPath =
        process.env.NODE_ENV === 'production'
          ? process.env.VUE_APP_ROUTER_BASE
          : '/'
      return pdf.createLoadingTask({
        url: this.loadPdfUrl,
        cMapUrl: `${publicPath}cmaps/`,
        cMapPacked: true
      })
    }
  },
  watch: {
    pdfList(){
      console.log("===77777====>");
      this.cacheFileList=this.pdfList;
      // this.loadPdfUrl =this.cacheFileList[0].pdfUrl;
      this.fileCount=this.cacheFileList.length;
      // console.log(this.loadPdfUrl);
    },
    pageCount(value) {
      if (value) this.page = this.startPage
    }
  },
  mounted() {
    if(this.cacheFileList&& this.cacheFileList.length>0){
      this.loadPdfUrl =this.pdfList[0].pdfUrl;
    }
    window.addEventListener('mousewheel', this.handleScroll, { passive: false })

  },
  methods: {
    addPdfUrl(ydSn,pdfUrl){
      let item={
        "ydSn":ydSn,
        "pdfUrl":pdfUrl
      }
      this.pdfList.push(item);
    },
    handleScroll(e){
      // 判断是不是按下ctrl键
      if(e.ctrlKey) {
        // 取消浏览器默认的放大缩小网页行为
        e.preventDefault()
        // 判断是向上滚动还是向下滚动
        if (e.deltaY > 0) {
          // 放大重写，业务代码
          this.zoomOut()
        } else {
          // 缩小重写，业务代码
          this.zoomIn()
        }
      }
    },
    onPageLoaded(){
      this.doScale(20);
    },
    doScale(val){
       if (isNaN(val)) {
        this.scale = this.preScale
        return
      }
      if (val< 10) {
        this.scale = 10
      }
      if (val > 200) {
        this.scale = 200
      }
      this.preScale = this.scale
      // this.$refs.pdf.$el.style.width = parseInt(this.scale) + '%';
      // this.$refs.pdf.$el.style.margin = "0 auto";

      this.$refs.pdf.$el.style.width = parseInt(this.scale) + '%';
      this.$refs.pdf.$el.style.margin = "0 auto";
    },
    setScaleValue(e) {
      this.doScale(e.target.value)
    },
    zoomIn() {
      if (this.scale > 20) {
        this.scale += -5
        this.$refs.pdf.$el.style.width = parseInt(this.scale) + '%'
        this.$refs.pdf.$el.style.margin = "0 auto";
      }
    },
    zoomOut() {
      if (this.scale < 200) {
        this.scale += 5
        this.$refs.pdf.$el.style.width = parseInt(this.scale) + '%'
        this.$refs.pdf.$el.style.margin = "0 auto";
      }
    },
    preFile(){
      let count = this.currentNum - 1
      if (count < 1) return
      this.currentNum = count
      this.loadPdfUrl =this.cacheFileList[this.currentNum-1].pdfUrl;
    },
    nextFile() {
      console.log('this.fileCount', this.currentNum, this.fileCount)
      let count = this.currentNum + 1
      if (count > this.fileCount) return
      this.currentNum = count
      this.loadPdfUrl =this.cacheFileList[this.currentNum-1].pdfUrl;
    },
    prePage() {
      let count = this.currentPage - 1
      if (count < 1) return
      this.page = count
    },
    nextPage() {
      console.log('this.pageCount', this.currentPage, this.pageCount)
      let count = this.currentPage + 1
      if (count > this.pageCount) return
      this.page = count
    },
     // 下载
     downPDF() {
          var tempLink = document.createElement('a')
          tempLink.style.display = 'none'
          tempLink.href = this.loadPdfUrl
          tempLink.setAttribute('download', (new Date()).getTime()+'.pdf')
          if (typeof tempLink.download === 'undefined') {
              tempLink.setAttribute('target', '_blank')
          }
          document.body.appendChild(tempLink)
          tempLink.click()
          document.body.removeChild(tempLink)
      },
      // 打印
      printPDF() {
          // this.$refs.pdf.print()
          this.$emit("onPrint");

      }
  }
}
</script>
<style lang="scss" scoped>
  .grid1 {
    height: 200px;
    background-image:
      linear-gradient(45deg, #8d8b8b 25%, transparent 0),
      linear-gradient(-45deg, #8d8b8b 25%, transparent 0),
      linear-gradient(45deg, transparent 75%, #8d8b8b 0),
      linear-gradient(-45deg, transparent 75%, #8d8b8b 0);
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    background-size: 20px 20px;
  }

  .grid2 {
  height: 200px;
  background-image: radial-gradient(circle, rgb(165, 165, 165) 1px, #fff 1px);
  background-size: 20px 20px;
  background-position: center center;
}


.grid3 {
  height: 200px;
  background-image:
      linear-gradient(to right, rgb(203 213 225) 1px, transparent 1px),
      linear-gradient(to bottom, rgb(203 213 225) 1px, transparent 1px);
  background-size: 20px 20px;
  background-position: center center;
}

.grid4 {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40'%3E%3Crect width='40' height='40' fill='%23fff' /%3E%3Crect x='50%' width='1' height='100%' fill='rgb(203 213 225)' /%3E%3Crect y='50%' width='100%' height='1' fill='rgb(203 213 225)' /%3E%3C/svg%3E%0A");
}

.pdf-viewer {
  position: relative;
  width: 100%;
  height: 100%;
  // overflow: hidden;
  overflow: auto;
  // height: 100%;
  font-family: PingFang SC;
  // width: 100%;
  // position: relative;
  // background: #eeeeee;
  // background: #dcdcdc;

  .tools {
    display: flex;
    z-index: 9999;
    position: absolute;
    top: 5px;
    right: 30px;
  }
  .pdf-bar {
    position: absolute;
    // position: fixed;
    top: 0px;
    left: 0px;
    z-index: 1;

    width: 100%;
    height: 50px;
    border: 1px solid #ddd;
    box-sizing: border-box;
    text-align: center;
    background: #f8f8f8;

    display: flex;
    justify-content: center;
    align-items: center;
    & > div {
      min-width: 36px;
      height: 36px;
      line-height: 36px;
      color: #666;
      cursor: pointer;
      i {
        width: 100%;
        height: 100%;
        color: #666;
        font-weight: bold;
      }
      ::v-deep .el-input--mini {
        input {
          padding: 0 8px;
          width: 50px;
          text-align: center;
        }
        .el-input-group__append {
          padding: 0 6px;
          color: #666;
          cursor: auto;
        }
      }
      ::v-deep .el-input-number {
        margin-left: 10px;
        width: 40px;
        .el-input-number__decrease {
          display: none;
        }
        .el-input-number__increase {
          display: none;
        }
        .el-input--mini {
          input {
            width: 40px;
            text-align: center;
          }
        }
      }
    }
    .prev {
      margin-left: 16px;
    }
    .scale,
    .page {
      display: flex;
      align-items: center;
    }
    .page-count {
      margin-right: 10px;
    }
  }
  .pdf-wrapper {
    position: absolute;
    margin-top: 70px;
    width: 100%;
    height: calc(100% - 70px);
    overflow: auto;
  }
}
</style>