mirror of
https://github.com/MODSetter/SurfSense.git
synced 2026-04-28 18:36:23 +02:00
refactor: streamline PDF handling in viewer and resume components by replacing react-pdf with pdfjs-dist, enhancing loading states and error management
This commit is contained in:
Anish Sarkar
parent
6e7f832181
commit
df88fcd0fb
2 changed files with 260 additions and 119 deletions
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@ -1,15 +1,14 @@
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"use client";
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import { ChevronLeftIcon, ChevronRightIcon, ZoomInIcon, ZoomOutIcon } from "lucide-react";
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import { useCallback, useRef, useState } from "react";
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import { Document, Page, pdfjs } from "react-pdf";
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import "react-pdf/dist/Page/AnnotationLayer.css";
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import "react-pdf/dist/Page/TextLayer.css";
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import { ZoomInIcon, ZoomOutIcon } from "lucide-react";
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import { useCallback, useEffect, useRef, useState } from "react";
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import * as pdfjsLib from "pdfjs-dist";
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import type { PDFDocumentProxy, RenderTask } from "pdfjs-dist";
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import { Button } from "@/components/ui/button";
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import { Spinner } from "@/components/ui/spinner";
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import { getAuthHeaders } from "@/lib/auth-utils";
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pdfjs.GlobalWorkerOptions.workerSrc = new URL(
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pdfjsLib.GlobalWorkerOptions.workerSrc = new URL(
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"pdfjs-dist/build/pdf.worker.min.mjs",
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import.meta.url
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).toString();
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@ -21,39 +20,164 @@ interface PdfViewerProps {
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const ZOOM_STEP = 0.15;
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const MIN_ZOOM = 0.5;
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const MAX_ZOOM = 3;
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const PAGE_GAP = 12;
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export function PdfViewer({ pdfUrl }: PdfViewerProps) {
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const [numPages, setNumPages] = useState<number>(0);
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const [pageNumber, setPageNumber] = useState(1);
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const [numPages, setNumPages] = useState(0);
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const [scale, setScale] = useState(1);
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const [loading, setLoading] = useState(true);
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const [loadError, setLoadError] = useState<string | null>(null);
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const containerRef = useRef<HTMLDivElement>(null);
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const documentOptionsRef = useRef({ httpHeaders: getAuthHeaders() });
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const [currentPage, setCurrentPage] = useState(1);
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const onDocumentLoadSuccess = useCallback(({ numPages }: { numPages: number }) => {
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setNumPages(numPages);
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setPageNumber(1);
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setLoadError(null);
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const scrollContainerRef = useRef<HTMLDivElement>(null);
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const pagesContainerRef = useRef<HTMLDivElement>(null);
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const pdfDocRef = useRef<PDFDocumentProxy | null>(null);
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const canvasRefs = useRef<Map<number, HTMLCanvasElement>>(new Map());
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const renderTasksRef = useRef<Map<number, RenderTask>>(new Map());
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const renderedScalesRef = useRef<Map<number, number>>(new Map());
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const renderPage = useCallback(async (pageNum: number, currentScale: number) => {
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const pdf = pdfDocRef.current;
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const canvas = canvasRefs.current.get(pageNum);
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if (!pdf || !canvas) return;
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if (renderedScalesRef.current.get(pageNum) === currentScale) return;
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const existing = renderTasksRef.current.get(pageNum);
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if (existing) {
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existing.cancel();
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renderTasksRef.current.delete(pageNum);
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}
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try {
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const page = await pdf.getPage(pageNum);
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const viewport = page.getViewport({ scale: currentScale });
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const dpr = window.devicePixelRatio || 1;
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canvas.width = Math.floor(viewport.width * dpr);
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canvas.height = Math.floor(viewport.height * dpr);
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canvas.style.width = `${Math.floor(viewport.width)}px`;
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canvas.style.height = `${Math.floor(viewport.height)}px`;
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const renderTask = page.render({
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canvas,
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viewport,
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transform: dpr !== 1 ? [dpr, 0, 0, dpr, 0, 0] : undefined,
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});
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renderTasksRef.current.set(pageNum, renderTask);
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await renderTask.promise;
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renderTasksRef.current.delete(pageNum);
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renderedScalesRef.current.set(pageNum, currentScale);
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} catch (err: unknown) {
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if (err instanceof Error && err.message?.includes("cancelled")) return;
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console.error(`Failed to render page ${pageNum}:`, err);
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}
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}, []);
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const onDocumentLoadError = useCallback((error: Error) => {
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setLoadError(error.message || "Failed to load PDF");
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}, []);
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useEffect(() => {
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let cancelled = false;
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const goToPrevPage = useCallback(() => {
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setPageNumber((prev) => Math.max(1, prev - 1));
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}, []);
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const loadDocument = async () => {
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setLoading(true);
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setLoadError(null);
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setNumPages(0);
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setCurrentPage(1);
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const goToNextPage = useCallback(() => {
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setPageNumber((prev) => Math.min(numPages, prev + 1));
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try {
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const loadingTask = pdfjsLib.getDocument({
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url: pdfUrl,
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httpHeaders: getAuthHeaders(),
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});
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const pdf = await loadingTask.promise;
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if (cancelled) {
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pdf.destroy();
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return;
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}
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pdfDocRef.current = pdf;
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setNumPages(pdf.numPages);
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setLoading(false);
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} catch (err: unknown) {
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if (cancelled) return;
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const message = err instanceof Error ? err.message : "Failed to load PDF";
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setLoadError(message);
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setLoading(false);
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}
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};
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loadDocument();
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return () => {
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cancelled = true;
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for (const task of renderTasksRef.current.values()) {
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task.cancel();
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}
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renderTasksRef.current.clear();
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renderedScalesRef.current.clear();
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pdfDocRef.current?.destroy();
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pdfDocRef.current = null;
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};
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}, [pdfUrl]);
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useEffect(() => {
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if (!pdfDocRef.current || numPages === 0) return;
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renderedScalesRef.current.clear();
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for (let i = 1; i <= numPages; i++) {
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renderPage(i, scale);
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}
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}, [scale, numPages, renderPage]);
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useEffect(() => {
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const container = scrollContainerRef.current;
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if (!container || numPages <= 1) return;
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const handleScroll = () => {
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const canvases = canvasRefs.current;
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const containerTop = container.scrollTop;
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const containerMid = containerTop + container.clientHeight / 2;
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let closest = 1;
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let closestDist = Number.POSITIVE_INFINITY;
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for (let i = 1; i <= numPages; i++) {
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const canvas = canvases.get(i);
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if (!canvas) continue;
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const rect = canvas.getBoundingClientRect();
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const containerRect = container.getBoundingClientRect();
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const canvasMid = rect.top - containerRect.top + containerTop + rect.height / 2;
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const dist = Math.abs(canvasMid - containerMid);
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if (dist < closestDist) {
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closestDist = dist;
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closest = i;
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}
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}
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setCurrentPage(closest);
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};
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container.addEventListener("scroll", handleScroll, { passive: true });
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return () => container.removeEventListener("scroll", handleScroll);
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}, [numPages]);
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const setCanvasRef = useCallback((pageNum: number, el: HTMLCanvasElement | null) => {
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if (el) {
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canvasRefs.current.set(pageNum, el);
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} else {
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canvasRefs.current.delete(pageNum);
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}
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}, []);
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const zoomIn = useCallback(() => {
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setScale((prev) => Math.min(MAX_ZOOM, prev + ZOOM_STEP));
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setScale((prev) => Math.min(MAX_ZOOM, +(prev + ZOOM_STEP).toFixed(2)));
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}, []);
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const zoomOut = useCallback(() => {
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setScale((prev) => Math.max(MIN_ZOOM, prev - ZOOM_STEP));
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setScale((prev) => Math.max(MIN_ZOOM, +(prev - ZOOM_STEP).toFixed(2)));
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}, []);
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if (loadError) {
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@ -67,32 +191,13 @@ export function PdfViewer({ pdfUrl }: PdfViewerProps) {
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return (
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<div className="flex flex-col h-full">
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{/* Controls bar */}
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{numPages > 0 && (
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<div className="flex items-center justify-center gap-2 px-4 py-2 border-b bg-sidebar shrink-0">
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{numPages > 1 && (
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<>
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<Button
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variant="ghost"
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size="icon"
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onClick={goToPrevPage}
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disabled={pageNumber <= 1}
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className="size-7"
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>
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<ChevronLeftIcon className="size-4" />
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</Button>
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<span className="text-xs text-muted-foreground tabular-nums min-w-[60px] text-center">
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{pageNumber} / {numPages}
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{currentPage} / {numPages}
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</span>
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<Button
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variant="ghost"
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size="icon"
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onClick={goToNextPage}
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disabled={pageNumber >= numPages}
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className="size-7"
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>
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<ChevronRightIcon className="size-4" />
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</Button>
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<div className="w-px h-4 bg-border mx-1" />
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</>
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)}
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@ -108,32 +213,29 @@ export function PdfViewer({ pdfUrl }: PdfViewerProps) {
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</div>
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)}
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{/* PDF content */}
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<div ref={containerRef} className="relative flex-1 overflow-auto flex justify-center bg-sidebar p-0">
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<Document
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file={pdfUrl}
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onLoadSuccess={onDocumentLoadSuccess}
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onLoadError={onDocumentLoadError}
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options={documentOptionsRef.current}
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loading={
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<div className="absolute inset-0 flex items-center justify-center text-sidebar-foreground">
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<Spinner size="md" />
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</div>
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}
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>
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<Page
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pageNumber={pageNumber}
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scale={scale}
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renderTextLayer
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renderAnnotationLayer
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className="shadow-lg"
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error={
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<div className="flex items-center justify-center h-64 text-sm text-muted-foreground">
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Failed to render page {pageNumber}
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</div>
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}
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/>
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</Document>
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<div
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ref={scrollContainerRef}
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className="relative flex-1 overflow-auto bg-sidebar"
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>
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{loading ? (
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<div className="absolute inset-0 flex items-center justify-center text-sidebar-foreground">
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<Spinner size="md" />
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</div>
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) : (
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<div
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ref={pagesContainerRef}
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className="flex flex-col items-center py-4"
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style={{ gap: `${PAGE_GAP}px` }}
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>
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{Array.from({ length: numPages }, (_, i) => i + 1).map((pageNum) => (
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<canvas
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key={pageNum}
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ref={(el) => setCanvasRef(pageNum, el)}
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className="shadow-lg"
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/>
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))}
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</div>
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)}
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</div>
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</div>
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);
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