v1.1.4
This commit is contained in:
Lyz Coote
375
frontend/src/routes/pdf/+page.svelte
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375
frontend/src/routes/pdf/+page.svelte
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<script lang="ts">
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import { onMount } from "svelte";
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import type { PageData } from './$types';
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import {
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RotateCcw,
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RotateCw,
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ZoomIn,
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ZoomOut,
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AlignHorizontalSpaceAround
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} from "@lucide/svelte";
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import { sidebarOpen } from "$lib/stores/app";
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import { toast } from "svelte-sonner";
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import * as pdfjsLib from "pdfjs-dist";
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import pdfWorker from "pdfjs-dist/build/pdf.worker.min.mjs?url";
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if (typeof Promise.withResolvers === 'undefined') {
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// @ts-ignore
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Promise.withResolvers = function () {
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let resolve, reject;
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const promise = new Promise((res, rej) => {
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resolve = res;
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reject = rej;
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});
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return { promise, resolve, reject };
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};
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}
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// Set worker source
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pdfjsLib.GlobalWorkerOptions.workerSrc = pdfWorker;
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let { data }: { data: PageData } = $props();
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let pdfData = $state<Uint8Array | null>(null);
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let filename = $state("");
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let rotation = $state(0);
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let scale = $state(1.5); // Default scale
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let error = $state("");
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let loading = $state(true);
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let pdfDoc = $state<pdfjsLib.PDFDocumentProxy | null>(null);
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let pageNum = $state(1);
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let totalPages = $state(0);
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let canvasRef = $state<HTMLCanvasElement>();
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let canvasContainerRef = $state<HTMLDivElement>();
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let renderTask = $state<pdfjsLib.RenderTask | null>(null);
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onMount(async () => {
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try {
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const result = data?.data;
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if (result) {
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// Decode Base64 to Uint8Array
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const binaryString = window.atob(result.data);
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const len = binaryString.length;
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const bytes = new Uint8Array(len);
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for (let i = 0; i < len; i++) {
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bytes[i] = binaryString.charCodeAt(i);
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}
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pdfData = bytes;
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filename = result.filename;
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// Adjust title
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document.title = filename + " - EMLy PDF Viewer";
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sidebarOpen.set(false);
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await loadPDF();
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} else {
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toast.error("No PDF data provided");
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error = "No PDF data provided. Please open this window from the main EMLy application.";
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loading = false;
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}
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} catch (e) {
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error = "Failed to load PDF: " + e;
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loading = false;
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}
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});
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async function loadPDF() {
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if (!pdfData) return;
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// Set a timeout to prevent infinite loading
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const timeout = setTimeout(() => {
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if (loading) {
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loading = false;
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error = "Timeout loading PDF. The worker might have failed to initialize.";
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toast.error(error);
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}
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}, 10000);
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try {
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const loadingTask = pdfjsLib.getDocument({ data: pdfData });
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pdfDoc = await loadingTask.promise;
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totalPages = pdfDoc.numPages;
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pageNum = 1;
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await renderPage(pageNum);
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loading = false;
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} catch (e) {
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console.error(e);
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error = "Error parsing PDF: " + e;
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loading = false;
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} finally {
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clearTimeout(timeout);
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}
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}
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async function renderPage(num: number) {
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if (!pdfDoc || !canvasRef) return;
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if (renderTask) {
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await renderTask.promise.catch(() => {}); // Cancel previous render if any (though we wait usually)
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}
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try {
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const page = await pdfDoc.getPage(num);
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// Calculate scale if needed or use current scale
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// We apply rotation to the viewport
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const viewport = page.getViewport({ scale: scale, rotation: rotation });
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const canvas = canvasRef;
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const context = canvas.getContext('2d');
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if (!context) return;
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canvas.height = viewport.height;
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canvas.width = viewport.width;
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const renderContext = {
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canvasContext: context,
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viewport: viewport
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};
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// Cast to any to avoid type mismatch with PDF.js definitions
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await page.render(renderContext as any).promise;
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} catch (e: any) {
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if (e.name !== 'RenderingCancelledException') {
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console.error(e);
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toast.error("Error rendering page: " + e.message);
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}
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}
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}
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function fitToWidth() {
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if (!pdfDoc || !canvasContainerRef) return;
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// We need to fetch page to get dimensions
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loading = true;
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pdfDoc.getPage(pageNum).then(page => {
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const containerWidth = canvasContainerRef!.clientWidth - 40; // padding
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const viewport = page.getViewport({ scale: 1, rotation: rotation });
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scale = containerWidth / viewport.width;
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renderPage(pageNum).then(() => { loading = false; });
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});
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}
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$effect(() => {
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// Re-render when scale or rotation changes
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// Access them here to ensure dependency tracking since renderPage is async
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const _deps = [scale, rotation];
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if (pdfDoc) {
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renderPage(pageNum);
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}
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});
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function rotate(deg: number) {
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rotation = (rotation + deg + 360) % 360;
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}
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function zoom(factor: number) {
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scale = Math.max(0.1, Math.min(5.0, scale + factor));
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}
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function nextPage() {
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if (pageNum >= totalPages) return;
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pageNum++;
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renderPage(pageNum);
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}
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function prevPage() {
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if (pageNum <= 1) return;
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pageNum--;
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renderPage(pageNum);
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}
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</script>
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<div class="viewer-container">
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{#if loading}
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<div class="loading-overlay">
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<div class="spinner"></div>
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<div>Loading PDF...</div>
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</div>
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{/if}
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{#if error}
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<div class="error-overlay">
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<div class="error-message">{error}</div>
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</div>
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{/if}
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<div class="toolbar">
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<h1 class="title" title={filename}>{filename || "Image Viewer"}</h1>
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<div class="controls">
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<button class="btn" onclick={() => zoom(0.1)} title="Zoom In">
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<ZoomIn size="16" />
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</button>
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<button class="btn" onclick={() => zoom(-0.1)} title="Zoom Out">
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<ZoomOut size="16" />
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</button>
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<div class="separator"></div>
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<button class="btn" onclick={() => rotate(-90)} title="Rotate Left">
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<RotateCcw size="16" />
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</button>
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<button class="btn" onclick={() => rotate(90)} title="Rotate Right">
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<RotateCw size="16" />
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</button>
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<div class="separator"></div>
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<button class="btn" onclick={fitToWidth} title="Reset">
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<AlignHorizontalSpaceAround size="16" />
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</button>
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</div>
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</div>
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<div class="canvas-container" bind:this={canvasContainerRef}>
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<canvas bind:this={canvasRef}></canvas>
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</div>
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</div>
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<style>
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.viewer-container {
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display: flex;
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flex-direction: column;
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height: 100%;
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background: #1e1e1e;
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position: relative;
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user-select: none;
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}
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.loading-overlay {
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position: absolute;
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inset: 0;
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z-index: 50;
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display: flex;
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flex-direction: column; /* Match the requested style */
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gap: 10px;
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align-items: center;
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justify-content: center;
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background: #111;
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color: white;
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}
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.spinner {
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width: 32px;
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height: 32px;
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border: 2px solid rgba(255, 255, 255, 0.1);
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border-top-color: rgba(255, 255, 255, 0.8);
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border-radius: 50%;
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animation: spin 0.6s linear infinite;
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}
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@keyframes spin {
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to {
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transform: rotate(360deg);
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}
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}
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.error-overlay {
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position: absolute;
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inset: 0;
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z-index: 40;
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display: flex;
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align-items: center;
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justify-content: center;
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background: #111;
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color: #ef4444;
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}
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.toolbar {
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height: 50px;
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background: #000;
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border-bottom: 1px solid rgba(255, 255, 255, 0.08);
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display: flex;
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align-items: center;
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justify-content: space-between;
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padding: 0 16px;
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flex-shrink: 0;
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z-index: 10;
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}
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.title {
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font-size: 14px;
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font-weight: 500;
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opacity: 0.9;
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white-space: nowrap;
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overflow: hidden;
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text-overflow: ellipsis;
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max-width: 50%;
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}
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.controls {
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display: flex;
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align-items: center;
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gap: 6px;
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}
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.separator {
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width: 1px;
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height: 18px;
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background: rgba(255, 255, 255, 0.15);
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margin: 0 4px;
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}
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.btn {
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display: inline-flex;
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align-items: center;
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justify-content: center;
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width: 32px;
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height: 32px;
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padding: 0;
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border-radius: 8px;
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border: 1px solid rgba(255, 255, 255, 0.12);
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background: rgba(255, 255, 255, 0.06);
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color: rgba(255, 255, 255, 0.85);
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cursor: pointer;
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transition: all 0.2s;
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}
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.btn:hover {
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background: rgba(255, 255, 255, 0.12);
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color: #fff;
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}
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.separator {
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width: 1px;
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height: 24px;
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background: rgba(255, 255, 255, 0.1);
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}
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.canvas-container {
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flex: 1;
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overflow: auto;
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display: flex;
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justify-content: center;
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align-items: flex-start; /* scroll from top */
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padding: 20px;
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background: #333; /* Dark background for contrast */
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}
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canvas {
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box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
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max-width: none; /* Allow canvas to be larger than container */
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}
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::-webkit-scrollbar {
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width: 6px;
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height: 6px;
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}
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::-webkit-scrollbar-track {
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background: transparent;
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}
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::-webkit-scrollbar-thumb {
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background: rgba(255, 255, 255, 0.1);
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border-radius: 6px;
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}
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::-webkit-scrollbar-thumb:hover {
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background: rgba(255, 255, 255, 0.2);
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}
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::-webkit-scrollbar-corner {
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background: transparent;
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}
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</style>
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