react-ipdf-viewer/dist/components/PDFRenderer.js

A lightweight, dependency-free media viewer for PDFs and other media types with advanced controls

var __assign = (this && this.__assign) || function () {
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import { jsx as _jsx } from "react/jsx-runtime";
import React, { useState, useEffect, useRef } from "react";
import * as pdfjsLib from "pdfjs-dist";
import { Spin } from "antd";
pdfjsLib.GlobalWorkerOptions.workerSrc = "//cdnjs.cloudflare.com/ajax/libs/pdf.js/".concat(pdfjsLib.version, "/pdf.worker.min.js");
var PDFRenderer = function (_a) {
    var fileUrl = _a.fileUrl, _b = _a.zoom, zoom = _b === void 0 ? 1.5 : _b, _c = _a.rotation, rotation = _c === void 0 ? 0 : _c, onError = _a.onError;
    var _d = useState(null), pdf = _d[0], setPdf = _d[1];
    var canvasRefs = useRef([]);
    // Load PDF and create canvas refs
    useEffect(function () {
        var loadPdf = function () { return __awaiter(void 0, void 0, void 0, function () {
            var loadingTask, loadedPdf, err_1;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        _a.trys.push([0, 2, , 3]);
                        loadingTask = pdfjsLib.getDocument(fileUrl);
                        return [4 /*yield*/, loadingTask.promise];
                    case 1:
                        loadedPdf = _a.sent();
                        setPdf(loadedPdf);
                        // Prepare canvas refs based on number of pages
                        canvasRefs.current = Array(loadedPdf.numPages)
                            .fill(null)
                            .map(function () { return React.createRef(); });
                        return [3 /*break*/, 3];
                    case 2:
                        err_1 = _a.sent();
                        if (onError && err_1 instanceof Error) {
                            onError(err_1);
                        }
                        return [3 /*break*/, 3];
                    case 3: return [2 /*return*/];
                }
            });
        }); };
        loadPdf();
    }, [fileUrl, onError]);
    // Render pages after canvases are mounted
    useEffect(function () {
        var renderAllPages = function () { return __awaiter(void 0, void 0, void 0, function () {
            var pageNumber, page, canvas, context, viewport, err_2;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        if (!pdf || canvasRefs.current.length === 0)
                            return [2 /*return*/];
                        pageNumber = 1;
                        _a.label = 1;
                    case 1:
                        if (!(pageNumber <= pdf.numPages)) return [3 /*break*/, 7];
                        _a.label = 2;
                    case 2:
                        _a.trys.push([2, 5, , 6]);
                        return [4 /*yield*/, pdf.getPage(pageNumber)];
                    case 3:
                        page = _a.sent();
                        canvas = canvasRefs.current[pageNumber - 1].current;
                        if (!canvas)
                            return [3 /*break*/, 6];
                        context = canvas.getContext("2d");
                        if (!context)
                            return [3 /*break*/, 6];
                        viewport = page.getViewport({ scale: 1.5 });
                        // Resize the canvas to match the page size
                        canvas.width = viewport.width;
                        canvas.height = viewport.height;
                        // Clear previous drawings
                        context.clearRect(0, 0, canvas.width, canvas.height);
                        return [4 /*yield*/, page.render({
                                canvasContext: context,
                                viewport: viewport,
                            }).promise];
                    case 4:
                        _a.sent();
                        return [3 /*break*/, 6];
                    case 5:
                        err_2 = _a.sent();
                        if (onError && err_2 instanceof Error) {
                            onError(err_2);
                        }
                        return [3 /*break*/, 6];
                    case 6:
                        pageNumber++;
                        return [3 /*break*/, 1];
                    case 7: return [2 /*return*/];
                }
            });
        }); };
        renderAllPages();
    }, [pdf, zoom, rotation, onError]);
    return (_jsx("div", __assign({ style: {
            display: "flex",
            flexDirection: "column",
            alignItems: "center",
            width: "50%",
            height: "100%",
            justifyContent: "center",
            transform: "scale(".concat(zoom, ")"),
            transformOrigin: "left top",
            transition: "transform 0.5s ease",
        } }, { children: _jsx("div", __assign({ style: {
                display: "flex",
                flexDirection: "column",
                alignItems: "center",
                width: "100%",
                height: "100%",
            } }, { children: _jsx("div", __assign({ style: {
                    width: "100%",
                    height: "100vh",
                    marginTop: "5px",
                    marginBottom: "10px",
                    overflow: "auto",
                } }, { children: pdf ? (Array.from({ length: pdf.numPages }, function (_, index) { return (_jsx("canvas", { ref: canvasRefs.current[index], style: {
                        width: "100%",
                        marginBottom: "10px",
                        border: "1px solid #ccc",
                        transform: " rotate(".concat(rotation, "deg)"),
                        transition: "transform 0.5s ease",
                    } }, index)); })) : (_jsx("div", __assign({ style: { textAlign: "center", marginTop: "50px" } }, { children: _jsx(Spin, { size: "large", tip: "Loading PDF..." }) }))) })) })) })));
};
export default PDFRenderer;