init
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templates/pdf_reader.html
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199
templates/pdf_reader.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
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<title>PDF Reader</title>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.11.338/pdf.min.js"></script>
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<style>
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:root {
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--background-color: #121212;
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--text-color: #EAEAEA;
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--accent-color: #FF9500;
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--header-bg: rgba(20, 20, 22, 0.85);
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--border-color: rgba(255, 255, 255, 0.1);
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}
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body {
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margin: 0;
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background-color: var(--background-color);
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color: var(--text-color);
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
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overflow-y: scroll;
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}
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#reader-header {
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position: fixed;
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top: 0;
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left: 0;
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right: 0;
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z-index: 100;
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background-color: var(--header-bg);
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backdrop-filter: blur(14px);
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-webkit-backdrop-filter: blur(14px);
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border-bottom: 1px solid var(--border-color);
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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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height: 55px;
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padding: 0 20px;
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}
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#pdf-title {
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font-size: 17px;
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font-weight: 600;
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white-space: nowrap;
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overflow: hidden;
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text-overflow: ellipsis;
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}
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#page-indicator {
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font-size: 14px;
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color: #ccc;
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}
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#loader {
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position: fixed;
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top: 50%;
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left: 50%;
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transform: translate(-50%, -50%);
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width: 40px;
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height: 40px;
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border: 4px solid #444;
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border-top-color: var(--accent-color);
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border-radius: 50%;
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animation: spin 1s linear infinite;
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}
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@keyframes spin {
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to { transform: translate(-50%, -50%) rotate(360deg); }
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}
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#pdf-container {
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padding-top: 70px; /* Space for header */
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display: flex;
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flex-direction: column;
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align-items: center;
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gap: 10px;
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}
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#pdf-container canvas {
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max-width: 100%;
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height: auto;
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box-shadow: 0 4px 15px rgba(0,0,0,0.3);
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}
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</style>
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</head>
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<body>
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<header id="reader-header">
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<h1 id="pdf-title">Loading PDF...</h1>
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<div id="page-indicator">Page 1 / ?</div>
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</header>
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<div id="loader"></div>
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<main id="pdf-container"></main>
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<script>
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// Set worker source for PDF.js
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pdfjsLib.GlobalWorkerOptions.workerSrc = `https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.11.338/pdf.worker.min.js`;
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const container = document.getElementById('pdf-container');
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const loader = document.getElementById('loader');
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const titleEl = document.getElementById('pdf-title');
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const pageIndicator = document.getElementById('page-indicator');
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let pdfDoc = null;
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let currentPage = 1;
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let totalPages = 0;
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// --- IndexedDB Functions ---
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const DB_NAME = 'PDFLibraryDB';
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const DB_VERSION = 1;
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const STORE_NAME = 'pdfs';
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function openDB() {
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return new Promise((resolve, reject) => {
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const request = indexedDB.open(DB_NAME, DB_VERSION);
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request.onerror = (e) => reject("Error opening DB: " + e.target.errorCode);
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request.onsuccess = (e) => resolve(e.target.result);
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request.onupgradeneeded = (e) => {
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if (!e.target.result.objectStoreNames.contains(STORE_NAME)) {
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e.target.result.createObjectStore(STORE_NAME, { keyPath: 'id', autoIncrement: true });
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}
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};
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});
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}
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async function getPdfFromDB(id) {
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const db = await openDB();
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const transaction = db.transaction(STORE_NAME, 'readonly');
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const store = transaction.objectStore(STORE_NAME);
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return new Promise((resolve, reject) => {
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const request = store.get(Number(id));
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request.onsuccess = (e) => resolve(e.target.result);
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request.onerror = (e) => reject("Error fetching PDF: " + e.target.errorCode);
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});
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}
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async function renderPdf(pdfData) {
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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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loader.style.display = 'none';
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pageIndicator.textContent = `Page 1 / ${totalPages}`;
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for (let pageNum = 1; pageNum <= totalPages; pageNum++) {
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const page = await pdfDoc.getPage(pageNum);
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const viewport = page.getViewport({ scale: 2.0 });
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const canvas = document.createElement('canvas');
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const context = canvas.getContext('2d');
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canvas.height = viewport.height;
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canvas.width = viewport.width;
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container.appendChild(canvas);
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await page.render({ canvasContext: context, viewport: viewport }).promise;
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}
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}
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function updatePageIndicator() {
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let mostVisiblePage = 1;
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const canvases = container.getElementsByTagName('canvas');
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let maxVisibility = 0;
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for (let i = 0; i < canvases.length; i++) {
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const rect = canvases[i].getBoundingClientRect();
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const visibleHeight = Math.max(0, Math.min(rect.bottom, window.innerHeight) - Math.max(rect.top, 0));
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const visibility = visibleHeight / rect.height;
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if (visibility > maxVisibility) {
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maxVisibility = visibility;
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mostVisiblePage = i + 1;
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}
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}
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pageIndicator.textContent = `Page ${mostVisiblePage} / ${totalPages}`;
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}
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async function init() {
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const urlParams = new URLSearchParams(window.location.search);
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const pdfId = urlParams.get('id');
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if (!pdfId) {
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titleEl.textContent = "No PDF specified.";
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loader.style.display = 'none';
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return;
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}
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try {
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const pdfRecord = await getPdfFromDB(pdfId);
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if (pdfRecord && pdfRecord.file) {
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titleEl.textContent = pdfRecord.name;
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const pdfBytes = await pdfRecord.file.arrayBuffer();
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await renderPdf(pdfBytes);
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window.addEventListener('scroll', updatePageIndicator);
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} else {
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throw new Error("PDF not found in offline library.");
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}
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} catch (error) {
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console.error("Failed to load PDF:", error);
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titleEl.textContent = "Error loading PDF";
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loader.style.display = 'none';
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}
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}
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document.addEventListener('DOMContentLoaded', init);
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</script>
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</body>
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</html>
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