feat(purchase): 添加PDF预览功能

- 集成vue-pdf-embed组件实现PDF预览功能
- 添加PDF预览弹窗界面和样式
- 实现PDF文件检测和预览逻辑
- 添加PDF加载成功和失败的处理机制
- 更新依赖包配置，添加pdfjs-dist和vue-pdf-embed
- 修复包依赖顺序和重复项问题

package.json

@@ -11,12 +11,14 @@
     "type-check": "vue-tsc --noEmit"
   },
   "dependencies": {
-    "vue": "^3.3.4",
-    "vue-router": "^4.2.4",
+    "@vant/touch-emulator": "^1.4.0",
+    "axios": "^1.5.0",
+    "pdfjs-dist": "^5.4.449",
     "pinia": "^2.1.6",
     "vant": "^4.6.6",
-    "axios": "^1.5.0",
-    "@vant/touch-emulator": "^1.4.0"
+    "vue": "^3.3.4",
+    "vue-pdf-embed": "^2.1.3",
+    "vue-router": "^4.2.4"
   },
   "devDependencies": {
     "@types/node": "^20.5.9",
@@ -29,9 +31,9 @@
     "prettier": "^3.0.2",
     "sass": "^1.66.1",
     "typescript": "~5.1.6",
-    "vite": "^4.4.9",
-    "vue-tsc": "^1.8.8",
     "unplugin-auto-import": "^0.16.6",
-    "unplugin-vue-components": "^0.25.2"
+    "unplugin-vue-components": "^0.25.2",
+    "vite": "^4.4.9",
+    "vue-tsc": "^1.8.8"
   }
 }

src/views/PurchaseDetail/index.vue

@@ -276,6 +276,26 @@
         </div>
       </div>
     </van-popup>
+    <!-- PDF预览弹窗 -->
+    <van-popup
+      v-model:show="pdfPreviewVisible"
+      position="bottom"
+      round
+      :style="{ height: '90%' }"
+      closeable
+    >
+      <div class="pdf-preview-container">
+        <div class="pdf-content">
+          <vue-pdf-embed
+            v-if="pdfUrl"
+            :source="pdfUrl"
+            class="vue-pdf-embed"
+            @loaded="handlePdfLoaded"
+            @loading-failed="handlePdfError"
+          />
+        </div>
+      </div>
+    </van-popup>
   </div>
 </template>
 
@@ -288,6 +308,13 @@ import { usePurchaseStore } from '@/store/purchase'
 import { getPurchaseApprovalHistory, submitPurchaseApproval } from '@/api/purchase'
 import { formatAmount, formatDate, getApprovalStatusColor, getFilePreviewUrl } from '@/utils'
 import type {ApprovalStatus, ApproveBtn, AttachmentFile, FileType} from '@/types'
+import VuePdfEmbed from 'vue-pdf-embed'
+import * as pdfjsLib from 'pdfjs-dist'
+
+// 设置 PDF worker
+// 使用 import.meta.url 来确保在 Vite 环境下正确加载 worker
+const workerSrc = new URL('pdfjs-dist/build/pdf.worker.min.js', import.meta.url).toString()
+pdfjsLib.GlobalWorkerOptions.workerSrc = workerSrc
 
 const route = useRoute()
 const router = useRouter()
@@ -302,6 +329,9 @@ const approvalHistory = ref<any[]>([])
 
 // 审批相关
 const approvalDialogVisible = ref(false)
+const pdfPreviewVisible = ref(false)
+const pdfUrl = ref('')
+const pdfLoading = ref(false)
 const approvalOpinion = ref('')
 const currentApprovalStatus = ref<ApproveBtn>(3)
 const submitting = ref(false)
@@ -347,7 +377,25 @@ const previewFile = (file: AttachmentFile) => {
   }
 
   const url = getFilePreviewUrl(file.filePath)
+  const isPdf = file.fileName?.toLowerCase().endsWith('.pdf') || file.filePath?.toLowerCase().endsWith('.pdf')
+
+  if (isPdf) {
+    pdfUrl.value = url
+    pdfPreviewVisible.value = true
+    pdfLoading.value = true
+  } else {
     window.open(url, '_blank')
+  }
+}
+
+const handlePdfLoaded = () => {
+  pdfLoading.value = true
+}
+
+const handlePdfError = (error: any) => {
+  console.error('PDF加载失败:', error)
+  pdfLoading.value = false
+  showToast('PDF加载失败')
 }
 
 // 计算总金额
@@ -887,4 +935,31 @@ onMounted(async () => {
     background: var(--background-color-secondary);
   }
 }
+
+.pdf-preview-container {
+  height: 100%;
+  padding-top: 40px;
+  background: var(--background-color-secondary);
+  overflow-y: auto;
+  -webkit-overflow-scrolling: touch;
+  position: relative;
+}
+
+.pdf-loading {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  z-index: 10;
+}
+
+.pdf-content {
+  min-height: 100%;
+  background: white;
+}
+
+.vue-pdf-embed {
+  width: 100%;
+  display: block;
+}
 </style>