442 lines
11 KiB
Vue
442 lines
11 KiB
Vue
<template>
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<!-- 预览文件 -->
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<el-dialog class="l-dialog" :class="lDialog" :title="title" :visible.sync="dialogVisible" :showClose="true"
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:closeOnClickModal="false" @close="handleClose" :append-to-body="true">
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<div style="text-align:center">
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<!-- 图片预览 -->
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<template v-if="isImage">
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<div class="image-toolbar">
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<el-button size="mini" @click="downloadFile"><i class="el-icon-download"></i> 下载</el-button>
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</div>
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<el-image :src="processedFileUrl" :preview-src-list="previewList" fit="contain"
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style="max-width:100%;max-height:70vh">
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<div slot="error" class="image-slot">
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<i class="el-icon-picture-outline"></i>
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</div>
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</el-image>
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</template>
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<!-- PDF 预览 -->
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<template v-else>
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<div class="pdf-container">
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<!-- PDF加载状态 -->
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<div v-if="pdfLoading" class="pdf-loading">
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<i class="el-icon-loading"></i>
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<p>PDF加载中...</p>
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</div>
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<!-- PDF错误状态 -->
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<div v-else-if="pdfError" class="pdf-error">
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<i class="el-icon-warning"></i>
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<p>PDF加载失败</p>
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<el-button size="small" @click="retryLoadPdf">重试</el-button>
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</div>
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<!-- PDF内容 -->
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<div v-else class="pdf-content">
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<!-- PDF工具栏 -->
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<div class="pdf-toolbar">
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<div class="pdf-controls">
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<el-button size="mini" :disabled="currentPage <= 1" @click="prevPage">
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<i class="el-icon-arrow-left"></i> 上一页
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</el-button>
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<span class="page-info">
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{{ currentPage }} / {{ numPages }}
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</span>
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<el-button size="mini" :disabled="currentPage >= numPages" @click="nextPage">
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下一页 <i class="el-icon-arrow-right"></i>
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</el-button>
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</div>
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<div class="pdf-actions">
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<el-button size="mini" @click="downloadFile"><i class="el-icon-download"></i> 下载</el-button>
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</div>
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</div>
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<!-- PDF显示区域 -->
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<div class="pdf-viewer" @wheel="handleWheel" ref="pdfViewer">
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<pdf :src="processedFileUrl" :page="currentPage" @num-pages="numPages = $event" @loaded="onPdfLoaded"
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@error="onPdfError" style="width:100%;height:70vh" />
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</div>
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</div>
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</div>
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</template>
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</div>
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</el-dialog>
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</template>
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<script>
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import pdf from 'vue-pdf'
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import { getFileAsBase64Api } from '@/api/archivesManagement/fileManager/fileManager'
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export default {
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name: 'ViewFile',
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props: ['width', 'hight', 'dataForm', 'title', 'disabled', 'isAdd', 'rowData', 'projectId'],
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components: { pdf },
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data() {
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return {
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dialogVisible: true,
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lDialog: this.width > 500 ? "w700" : "w500",
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fileUrl: '', // 实际文件地址
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fileName: '', // 用于从文件名判断类型
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previewList: [], // 预览组（可只放当前图片）
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// PDF相关状态
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pdfLoading: false,
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pdfError: false,
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currentPage: 1,
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numPages: 0,
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// 滚轮翻页相关
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wheelTimeout: null,
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isWheelScrolling: false
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}
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},
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computed: {
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isImage() {
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// 允许的图片类型
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const exts = ['.jpg', '.jpeg', '.png', '.gif', '.bmp', '.webp']
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const url = (this.fileUrl || '')
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const name = (this.fileName || '').toLowerCase()
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return exts.some(ext => url.endsWith(ext) || name.endsWith(ext))
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},
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isPdf() {
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// 判断是否为PDF文件
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const exts = ['.pdf']
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const url = (this.fileUrl || '')
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const name = (this.fileName || '').toLowerCase()
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return exts.some(ext => url.endsWith(ext) || name.endsWith(ext))
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},
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processedFileUrl() {
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// 处理文件URL，为PDF和图片添加data前缀
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if (this.fileUrl && !this.fileUrl.startsWith('data:')) {
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if (this.isPdf) {
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return `data:application/pdf;base64,${this.fileUrl}`
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} else if (this.isImage) {
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// 根据图片类型添加相应的MIME类型
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const imageType = this.getImageMimeType()
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return `data:${imageType};base64,${this.fileUrl}`
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}
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}
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return this.fileUrl
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}
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},
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created() {
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this.getFileAsBase64();
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},
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watch: {
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isPdf(newVal) {
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if (newVal) {
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this.resetPdfState();
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}
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}
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},
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methods: {
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handleClose() {
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this.dialogVisible = false
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this.$emit('closeDialog')
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},
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/* 获取文件的base64 */
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getFileAsBase64() {
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if (this.isPdf) {
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this.pdfLoading = true;
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this.pdfError = false;
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}
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getFileAsBase64Api({ id: this.rowData.fileId }).then(res => {
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const obj = res.data;
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this.fileUrl = obj?.fileBase64 || ''
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this.fileName = obj?.fileName || ''
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// 预览组（如果你有多张，可放数组；没有就放当前一张）
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if (this.isImage && this.fileUrl) {
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this.previewList = [this.processedFileUrl]
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}
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}).catch(error => {
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if (this.isPdf) {
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this.pdfError = true;
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this.pdfLoading = false;
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}
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console.error('获取文件失败:', error);
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})
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},
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// PDF相关方法
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resetPdfState() {
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this.currentPage = 1;
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this.numPages = 0;
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this.pdfLoading = false;
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this.pdfError = false;
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this.isWheelScrolling = false;
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if (this.wheelTimeout) {
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clearTimeout(this.wheelTimeout);
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this.wheelTimeout = null;
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}
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},
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onPdfLoaded() {
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this.pdfLoading = false;
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this.pdfError = false;
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},
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onPdfError(error) {
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this.pdfLoading = false;
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this.pdfError = true;
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console.error('PDF加载失败:', error);
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},
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retryLoadPdf() {
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this.resetPdfState();
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this.getFileAsBase64();
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},
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prevPage() {
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if (this.currentPage > 1) {
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this.currentPage--;
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}
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},
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nextPage() {
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if (this.currentPage < this.numPages) {
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this.currentPage++;
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}
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},
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// 下载文件（图片或PDF，base64 -> Blob，避免在控制台暴露base64）
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downloadFile() {
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if (!this.fileUrl) return
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const filename = this.fileName || '文件'
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// 推断 MIME 类型
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let mime = this.isPdf ? 'application/pdf' : this.getImageMimeType()
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// 如果带有 data: 前缀，从中解析 mime 与数据体
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let base64Data = this.fileUrl
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if (typeof base64Data === 'string' && base64Data.startsWith('data:')) {
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try {
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const parts = base64Data.split(',')
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const header = parts[0]
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const dataPart = parts[1]
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const match = header.match(/^data:(.*?);base64$/)
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if (match && match[1]) mime = match[1]
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base64Data = dataPart
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} catch (e) {
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// 解析失败则按原样处理
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}
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}
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const blob = this.base64ToBlob(base64Data, mime)
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const url = URL.createObjectURL(blob)
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const a = document.createElement('a')
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a.style.display = 'none'
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a.href = url
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a.download = filename
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document.body.appendChild(a)
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a.click()
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document.body.removeChild(a)
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URL.revokeObjectURL(url)
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},
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// base64(不含data前缀) 转 Blob
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base64ToBlob(base64, mime) {
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const byteChars = atob(base64)
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const sliceSize = 1024
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const byteArrays = []
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for (let offset = 0; offset < byteChars.length; offset += sliceSize) {
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const slice = byteChars.slice(offset, offset + sliceSize)
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const byteNumbers = new Array(slice.length)
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for (let i = 0; i < slice.length; i++) {
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byteNumbers[i] = slice.charCodeAt(i)
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}
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const byteArray = new Uint8Array(byteNumbers)
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byteArrays.push(byteArray)
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}
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return new Blob(byteArrays, { type: mime || 'application/octet-stream' })
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},
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// 获取图片MIME类型
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getImageMimeType() {
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// 根据文件扩展名返回对应的MIME类型
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const name = (this.fileName || '').toLowerCase()
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if (name.endsWith('.jpg') || name.endsWith('.jpeg')) {
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return 'image/jpeg'
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} else if (name.endsWith('.png')) {
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return 'image/png'
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} else if (name.endsWith('.gif')) {
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return 'image/gif'
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} else if (name.endsWith('.bmp')) {
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return 'image/bmp'
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} else if (name.endsWith('.webp')) {
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return 'image/webp'
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}
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// 默认返回jpeg
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return 'image/jpeg'
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},
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// 处理滚轮事件
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handleWheel(event) {
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// 阻止默认滚动行为
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event.preventDefault();
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// 如果正在滚轮翻页中，忽略新的滚轮事件
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if (this.isWheelScrolling) {
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return;
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}
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// 设置滚轮翻页状态
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this.isWheelScrolling = true;
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// 清除之前的定时器
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if (this.wheelTimeout) {
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clearTimeout(this.wheelTimeout);
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}
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// 根据滚轮方向翻页
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if (event.deltaY > 0) {
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// 向下滚动 - 下一页
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this.nextPage();
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} else if (event.deltaY < 0) {
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// 向上滚动 - 上一页
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this.prevPage();
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}
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// 设置定时器，防止滚轮翻页过于频繁
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this.wheelTimeout = setTimeout(() => {
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this.isWheelScrolling = false;
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}, 300);
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}
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},
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}
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</script>
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<style lang="scss" scoped>
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.w700 .el-dialog {
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width: 700px;
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}
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.w500 .el-dialog {
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width: 500px;
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}
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.w500 .el-dialog__header,
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.w700 .el-dialog__header {
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// background: #eeeeee;
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.el-dialog__title {
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font-size: 16px;
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}
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}
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.yxq .el-range-separator {
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margin-right: 7px !important;
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}
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.el-date-editor--daterange.el-input__inner {
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width: 260px;
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}
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.form-item {
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width: 100%;
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}
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.select-style {
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display: flex;
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justify-content: space-between;
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}
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.image-slot {
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width: 100%;
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height: 240px;
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display: flex;
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align-items: center;
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justify-content: center;
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color: #909399;
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font-size: 24px;
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}
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/* PDF预览样式 */
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.pdf-container {
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width: 100%;
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height: 70vh;
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position: relative;
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}
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.pdf-loading,
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.pdf-error {
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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height: 100%;
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color: #909399;
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font-size: 16px;
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}
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.pdf-loading i {
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font-size: 32px;
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margin-bottom: 16px;
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animation: rotating 2s linear infinite;
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}
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.pdf-error i {
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font-size: 32px;
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margin-bottom: 16px;
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color: #F56C6C;
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}
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.pdf-content {
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height: 100%;
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display: flex;
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flex-direction: column;
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}
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.pdf-toolbar {
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display: flex;
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justify-content: space-between;
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align-items: center;
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padding: 8px 12px;
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background: #f5f5f5;
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border-bottom: 1px solid #e4e7ed;
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flex-shrink: 0;
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}
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.pdf-controls {
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display: flex;
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align-items: center;
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gap: 8px;
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}
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.image-toolbar {
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display: flex;
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justify-content: flex-end;
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padding: 4px 0 8px 0;
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}
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.pdf-actions {
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display: flex;
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align-items: center;
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gap: 8px;
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}
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.page-info {
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font-size: 14px;
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color: #606266;
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min-width: 60px;
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text-align: center;
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}
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.pdf-viewer {
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flex: 1;
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overflow: hidden;
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display: flex;
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justify-content: center;
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background: #f8f9fa;
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cursor: pointer;
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}
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/* 移除滚动条样式，因为现在使用滚轮翻页 */
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@keyframes rotating {
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0% {
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transform: rotate(0deg);
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}
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100% {
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transform: rotate(360deg);
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}
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}
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</style> |