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feat: 支持PDF文件预览(#1)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| .DS_Store | ||
| node_modules | ||
| /dist | ||
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| # local env files | ||
| .env.local | ||
| .env.*.local | ||
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| # Log files | ||
| npm-debug.log* | ||
| yarn-debug.log* | ||
| yarn-error.log* | ||
| pnpm-debug.log* | ||
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| # Editor directories and files | ||
| .idea | ||
| .vscode | ||
| *.suo | ||
| *.ntvs* | ||
| *.njsproj | ||
| *.sln | ||
| *.sw? |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| <template> | ||
| <div class="home_wrap"> | ||
| <div class="pdf_down"> | ||
| <div class="pdf_set_left" @click="scaleD()">➕</div> | ||
| <div class="pdf_set_middle" @click="scaleX()">➖</div> | ||
| </div> | ||
| <div :style="{ width: pdf_div_width, margin: '0 auto' }"> | ||
| <canvas | ||
| v-for="page in pdf_pages" | ||
| :id="'the_canvas' + page" | ||
| :key="page" | ||
| ></canvas> | ||
| </div> | ||
| </div> | ||
| </template> | ||
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| <script> | ||
| import * as PDFJS from "pdfjs-dist/legacy/build/pdf"; | ||
| PDFJS.GlobalWorkerOptions.workerSrc = require("pdfjs-dist/legacy/build/pdf.worker.entry.js"); | ||
| export default { | ||
| name: "PDF", | ||
| props: { | ||
| data: { | ||
| type: Object, | ||
| default: null, | ||
| }, | ||
| }, | ||
| data() { | ||
| return { | ||
| pdf_scale: 1.0, | ||
| pdf_pages: [], | ||
| pdf_div_width: "", | ||
| currentPage: 1, | ||
| }; | ||
| }, | ||
| mounted() { | ||
| this.loadFile(); | ||
| }, | ||
| methods: { | ||
| scaleD() { | ||
| //放大 | ||
| let max = 0; | ||
| if (window.screen.width > 1440) { | ||
| max = 1.4; | ||
| } else { | ||
| max = 1.2; | ||
| } | ||
| if (this.pdf_scale >= max) { | ||
| return; | ||
| } | ||
| this.pdf_scale = this.pdf_scale + 0.1; | ||
| this.loadFile(); | ||
| }, | ||
| scaleX() { | ||
| //缩小 | ||
| let min = 1.0; | ||
| if (this.pdf_scale <= min) { | ||
| return; | ||
| } | ||
| this.pdf_scale = this.pdf_scale - 0.1; | ||
| this.loadFile(); | ||
| }, | ||
| async loadFile() { | ||
| //初始化pdf | ||
| this.pdfDoc = await PDFJS.getDocument(this.data.content).promise; | ||
| this.pdf_pages = this.pdfDoc.numPages; | ||
| this.$nextTick(() => this.renderPage()); | ||
| }, | ||
| async renderPage(num = 1) { | ||
| this.currentPage = num; | ||
| //渲染pdf页 | ||
| const page = await this.pdfDoc.getPage(num); | ||
| const canvas = document.getElementById("the_canvas" + num); | ||
| // const canvas = document.getElementById("the_canvas"); | ||
| const ctx = canvas.getContext("2d"); | ||
| const dpr = window.devicePixelRatio || 1; | ||
| const bsr = | ||
| ctx.webkitBackingStorePixelRatio || | ||
| ctx.mozBackingStorePixelRatio || | ||
| ctx.msBackingStorePixelRatio || | ||
| ctx.oBackingStorePixelRatio || | ||
| ctx.backingStorePixelRatio || | ||
| 1; | ||
| const ratio = dpr / bsr; | ||
| const viewport = page.getViewport({ scale: this.pdf_scale }); | ||
| canvas.width = viewport.width * ratio; | ||
| canvas.height = viewport.height * ratio; | ||
| canvas.style.width = viewport.width + "px"; | ||
| this.pdf_div_width = viewport.width + "px"; | ||
| canvas.style.height = viewport.height + "px"; | ||
| ctx.setTransform(ratio, 0, 0, ratio, 0, 0); | ||
| const renderContext = { | ||
| canvasContext: ctx, | ||
| viewport: viewport, | ||
| }; | ||
| page.render(renderContext); | ||
| if (this.pdf_pages > num) { | ||
| setTimeout(() => { | ||
| return this.renderPage(num + 1); | ||
| }); | ||
| } | ||
| }, | ||
| nextPage() { | ||
| if (this.pdf_pages > this.currentPage) { | ||
| this.renderPage(this.currentPage + 1); | ||
| } | ||
| }, | ||
| prePage() { | ||
| if (this.currentPage > 1) { | ||
| this.renderPage(this.currentPage - 1); | ||
| } | ||
| }, | ||
| }, | ||
| }; | ||
| </script> | ||
|
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| <style scoped> | ||
| .home_wrap { | ||
| width: 100%; | ||
| height: 100%; | ||
| } | ||
| .home_wrap .pdf_down { | ||
| position: fixed; | ||
| display: flex; | ||
| z-index: 20; | ||
| right: 26px; | ||
| bottom: 7%; | ||
| cursor: pointer; | ||
| } | ||
| .home_wrap .pdf-pre { | ||
| position: fixed; | ||
| display: flex; | ||
| z-index: 20; | ||
| right: 160px; | ||
| bottom: 9%; | ||
| cursor: pointer; | ||
| } | ||
| .home_wrap .pdf-next { | ||
| position: fixed; | ||
| display: flex; | ||
| z-index: 20; | ||
| right: 100px; | ||
| bottom: 9%; | ||
| } | ||
| .home_wrap .pdf_down .pdf_set_left { | ||
| width: 30px; | ||
| height: 40px; | ||
| color: #408fff; | ||
| font-size: 15px; | ||
| padding-top: 25px; | ||
| text-align: center; | ||
| margin-right: 5px; | ||
| cursor: pointer; | ||
| } | ||
| .home_wrap .pdf_down .pdf_set_middle { | ||
| width: 30px; | ||
| height: 40px; | ||
| color: #408fff; | ||
| font-size: 15px; | ||
| padding-top: 25px; | ||
| text-align: center; | ||
| margin-right: 5px; | ||
| cursor: pointer; | ||
| } | ||
| </style> |
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