fix(测试跟踪): PDF预览问题

--bug=1023487 --user=宋昌昌 【测试跟踪】功能用例，预览附件pdf文件，一直在转圈，console有报错 https://www.tapd.cn/55049933/s/1341230

framework/sdk-parent/frontend/src/components/ModuleTrashButton.vue

@@ -1,8 +1,8 @@
 <template>
   <div @click="exe" class="recycle">
-    <div style="padding: 9px 24px;" class="to-public">
+    <div class="to-public">
       <svg-icon icon-class="icon_delete-trash_filled" style="width: 1.3em;height: 1.3em;"/>
-      <span style="position: relative;top: -2px;left: 7px;">{{ $t('commons.trash') }}</span>
+      <span style="position: relative;top: -0.5px;left: 11px;">{{ $t('commons.trash') }}</span>
     </div>
   </div>
 </template>
@@ -72,4 +72,10 @@ i.el-icon-delete {
   margin-right: 4px;
   font-size: 14px;
 }
+
+.to-public {
+  display: flex;
+  padding: 9px 24px;
+  min-width: 200px;
+}
 </style>

test-track/frontend/src/business/case/components/TestCaseFile.vue

@@ -4,7 +4,7 @@
       <img :src="url" :alt="$t('test_track.case.img_loading_fail')" style="width: 100%;height: 100%;"
            v-if="file.type === 'JPG' || file.type === 'JPEG' || file.type === 'PNG'">
       <div v-if="file.type === 'PDF'">
-        <test-case-pdf :file-id="file.id"/>
+        <test-case-pdf-view-base-js :pdf-url="'/attachment/preview/' + this.file.id + '/' + this.file.isLocal"/>
       </div>
     </div>
   </el-dialog>
@@ -12,12 +12,12 @@
 
 <script>
 
-import TestCasePdf from "@/business/case/components/TestCasePdf";
+import TestCasePdfViewBaseJs from "@/business/case/components/TestCasePdfViewBaseJs";
 import {generateModuleUrl} from "@/business/utils/sdk-utils";
 
 export default {
   name: "TestCaseFiles",
-  components: {TestCasePdf},
+  components: {TestCasePdfViewBaseJs},
   props: {},
   data() {
     return {

test-track/frontend/src/business/case/components/TestCasePdfViewBaseJs.vue

@@ -0,0 +1,129 @@
+<template>
+  <div ref="pdfViewer" class="pdfViewer" v-loading="loading"></div>
+</template>
+
+<script>
+import * as PdfJs from 'pdfjs-dist'
+import pdfJsWorker from 'pdfjs-dist/build/pdf.worker.entry'
+PdfJs.GlobalWorkerOptions.workerSrc = pdfJsWorker
+
+export default {
+  name: 'TestCasePdfViewBaseJs',
+  props: {
+    /**
+     * pdf地址
+     */
+    pdfUrl: {
+      type: String,
+      default: '',
+    },
+    // /**
+    //  * cMap的url地址(用于解决中文乱码或中文显示为空白的问题). 该资源的物理路径在: node_modules/pdfjs-dist/cmaps
+    //  */
+    // cMapUrl: {
+    //   type: String,
+    //   default: '',
+    // },
+    /**
+     * pdf缩放比例
+     */
+    scale: {
+      type: Number,
+      default: 1.85,
+    },
+  },
+  data() {
+    return {
+      loading: false,
+      pdfDocRef: null,
+    }
+  },
+  computed: {
+    urlObj() {
+      return { pdfUrl: this.pdfUrl, cMapUrl: this.cMapUrl }
+    },
+  },
+  watch: {
+    urlObj() {
+      this.renderPdf()
+    },
+    scale() {
+      this.renderPdf()
+    },
+  },
+  mounted() {
+    this.loading = true;
+    this.renderPdf()
+  },
+  methods: {
+    renderPdf() {
+      const pdfViewerDom = this.$refs.pdfViewer;
+      if (this.pdfUrl) {
+        // 获取pdf文件
+        const pdfLoadingTask = PdfJs.getDocument({
+          url: this.pdfUrl,
+          cMapUrl: this.cMapUrl
+        })
+        pdfLoadingTask.promise.then(pdfDoc => {
+          if (pdfDoc && pdfViewerDom) {
+            // 缓存pdf内容
+            this.pdfDocRef = pdfDoc
+            this.loading = false;
+            this.renderPdfCanvas(pdfViewerDom, pdfDoc, this.scale)
+          }
+        })
+      }
+    },
+    /**
+     * 渲染pdf文件的指定页到画板
+     * @param pdfViewerDom 承载pdf画板的dom容器
+     * @param pdfDoc pdf文件
+     * @param pageNum 需要渲染的页码
+     * @param scale 缩放比例
+     */
+    renderPdfOnePage(pdfViewerDom, pdfDoc, pageNum, scale) {
+      // 创建画布
+      const canvas = document.createElement('canvas')
+      pdfViewerDom.appendChild(canvas)
+      // 获取2d上下文
+      const context = canvas.getContext('2d')
+      pdfDoc.getPage(pageNum).then(page => {
+        // 获取当前pdf页内容, 并设置缩放
+        const viewport = page.getViewport({ scale: scale })
+        const realCanvas = context.canvas
+        realCanvas.width = viewport.width
+        realCanvas.height = viewport.height
+        // 将pdf当前页内容画到2d画板中
+        // @ts-ignore
+        page.render({ canvasContext: context, viewport })
+      })
+    },
+    /**
+     * 渲染pdf的画布
+     * @param pdfViewerDom 承载pdf画布的dom容器
+     * @param pdfDoc pdf文档
+     * @param scale 缩放比例
+     */
+    renderPdfCanvas(pdfViewerDom, pdfDoc, scale) {
+      // 清除原来的pdf画布
+      pdfViewerDom.innerHTML = ''
+      // 获取总页数
+      const totalPage = pdfDoc.numPages
+      // 获取父元素宽度
+      // let pdfViewer = document.querySelector(".pdfViewer");
+      // let pdfViewerWidth = window.getComputedStyle(pdfViewer).getPropertyValue("width").replaceAll("px", "")
+      // 获取显示容器, canvas占满
+      for (let i = 1; i <= totalPage; i++) {
+        // 循环处理pdf的每页
+        this.renderPdfOnePage(pdfViewerDom, pdfDoc, i, scale);
+      }
+    }
+  },
+}
+</script>
+
+<style scoped>
+canvas {
+  width: 100%!important;
+}
+</style>