Added a new multi-page viewer that uses lazy loading to display pages in a scrolling manner.
This commit is contained in:
Justin D'Arcangelo
parent
e9980c1558
commit
a9451a309f
50
multi-page-viewer.css
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50
multi-page-viewer.css
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/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- /
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/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
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body {
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font-family: 'Lucida Grande', 'Lucida Sans Unicode', Helvetica, Arial, Verdana, sans-serif;
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margin: 0px;
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padding: 0px;
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}
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canvas {
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box-shadow: 0px 4px 10px #000;
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-moz-box-shadow: 0px 4px 10px #000;
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-webkit-box-shadow: 0px 4px 10px #000;
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}
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span {
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font-size: 0.8em;
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}
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.page {
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width: 816px;
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height: 1056px;
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margin: 10px auto;
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}
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#controls {
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background-color: #eee;
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border-bottom: 1px solid #666;
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padding: 4px 0px 0px 10px;
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position:fixed;
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left: 0px;
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top: 0px;
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height: 28px;
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width: 100%;
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box-shadow: 0px 2px 8px #000;
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-moz-box-shadow: 0px 2px 8px #000;
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-webkit-box-shadow: 0px 2px 8px #000;
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}
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#pageNumber {
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margin: 0px 0px 0px 10px;
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text-align: right;
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}
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#viewer {
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background-color: #929292;
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margin: 32px 0px 0px;
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padding: 8px 0px;
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width: 100%;
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}
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21
multi-page-viewer.html
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multi-page-viewer.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>pdf.js Multi-Page Viewer</title>
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<link rel="stylesheet" href="multi-page-viewer.css" type="text/css" media="screen" charset="utf-8"/>
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<script type="text/javascript" src="pdf.js"></script>
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<script type="text/javascript" src="fonts.js"></script>
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<script type="text/javascript" src="glyphlist.js"></script>
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<script type="text/javascript" src="multi-page-viewer.js"></script>
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</head>
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<body>
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<div id="controls">
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<button id="previousPageButton">Previous</button>
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<button id="nextPageButton">Next</button>
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<input type="text" id="pageNumber" value="1" size="2"/>
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<span>/</span>
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<span id="numPages">--</span>
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</div>
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<div id="viewer"></div>
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</body>
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</html>
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261
multi-page-viewer.js
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261
multi-page-viewer.js
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/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- /
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/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
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var PDFViewer = {
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queryParams: {},
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element: null,
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pageNumberInput: null,
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pdf: null,
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url: 'compressed.tracemonkey-pldi-09.pdf',
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pageNumber: 1,
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numberOfPages: 1,
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scale: 1.0,
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pageWidth: function() {
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return 816 * PDFViewer.scale;
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},
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pageHeight: function() {
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return 1056 * PDFViewer.scale;
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},
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lastPagesDrawn: [],
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visiblePages: function() {
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var pageHeight = PDFViewer.pageHeight() + 20; // Add 20 for the margins.
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var windowTop = window.pageYOffset;
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var windowBottom = window.pageYOffset + window.innerHeight;
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var pageStartIndex = Math.floor(windowTop / pageHeight);
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var pageStopIndex = Math.ceil(windowBottom / pageHeight);
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var pages = [];
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for (var i = pageStartIndex; i <= pageStopIndex; i++) {
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pages.push(i + 1);
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}
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return pages;
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},
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createPage: function(num) {
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var anchor = document.createElement('a');
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anchor.name = '' + num;
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var div = document.createElement('div');
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div.id = 'pageContainer' + num;
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div.className = 'page';
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PDFViewer.element.appendChild(anchor);
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PDFViewer.element.appendChild(div);
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},
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removePage: function(num) {
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var div = document.getElementById('pageContainer' + num);
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if (div && div.hasChildNodes()) {
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while (div.childNodes.length > 0) {
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div.removeChild(div.firstChild);
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}
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}
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},
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drawPage: function(num) {
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if (PDFViewer.pdf) {
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var page = PDFViewer.pdf.getPage(num);
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var div = document.getElementById('pageContainer' + num);
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if (div && !div.hasChildNodes()) {
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var canvas = document.createElement('canvas');
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canvas.id = 'page' + num;
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canvas.mozOpaque = true;
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// Canvas dimensions must be specified in CSS pixels. CSS pixels
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// are always 96 dpi. These dimensions are 8.5in x 11in at 96dpi.
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canvas.width = 816;
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canvas.height = 1056;
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var ctx = canvas.getContext('2d');
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ctx.save();
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ctx.fillStyle = 'rgb(255, 255, 255)';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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ctx.restore();
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var gfx = new CanvasGraphics(ctx);
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var fonts = [];
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// page.compile will collect all fonts for us, once we have loaded them
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// we can trigger the actual page rendering with page.display
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page.compile(gfx, fonts);
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// This should be called when font loading is complete
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page.display(gfx);
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div.appendChild(canvas);
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}
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}
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},
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goToPage: function(num) {
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if (0 <= num && num <= PDFViewer.numberOfPages) {
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PDFViewer.pageNumber = num;
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}
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PDFViewer.pageNumberInput.value = PDFViewer.pageNumber;
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document.location.hash = PDFViewer.pageNumber;
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},
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goToPreviousPage: function() {
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if (PDFViewer.pageNumber > 1) {
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--PDFViewer.pageNumber;
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}
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PDFViewer.goToPage(PDFViewer.pageNumber);
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},
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goToNextPage: function() {
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if (PDFViewer.pageNumber < PDFViewer.numberOfPages) {
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++PDFViewer.pageNumber;
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}
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PDFViewer.goToPage(PDFViewer.pageNumber);
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},
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open: function(url) {
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PDFViewer.url = url;
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document.title = url;
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var req = new XMLHttpRequest();
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req.open('GET', url);
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req.mozResponseType = req.responseType = 'arraybuffer';
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req.expected = (document.URL.indexOf('file:') === 0) ? 0 : 200;
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req.onreadystatechange = function() {
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if (req.readyState === 4 && req.status === req.expected) {
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var data = req.mozResponseArrayBuffer ||
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req.mozResponse ||
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req.responseArrayBuffer ||
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req.response;
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PDFViewer.pdf = new PDFDoc(new Stream(data));
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PDFViewer.numberOfPages = PDFViewer.pdf.numPages;
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document.getElementById('numPages').innerHTML = PDFViewer.numberOfPages.toString();
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for (var i = 1; i <= PDFViewer.numberOfPages; i++) {
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PDFViewer.createPage(i);
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}
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if (PDFViewer.numberOfPages > 0) {
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PDFViewer.drawPage(1);
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}
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}
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};
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req.send(null);
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}
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};
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window.onload = function() {
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// Parse the URL query parameters into a cached object.
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PDFViewer.queryParams = function() {
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var qs = window.location.search.substring(1);
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var kvs = qs.split('&');
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var params = {};
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for (var i = 0; i < kvs.length; ++i) {
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var kv = kvs[i].split('=');
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params[unescape(kv[0])] = unescape(kv[1]);
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}
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return params;
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}();
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PDFViewer.element = document.getElementById('viewer');
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PDFViewer.pageNumberInput = document.getElementById('pageNumber');
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PDFViewer.pageNumberInput.onkeydown = function(evt) {
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var charCode = evt.charCode || evt.keyCode;
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// Up arrow key.
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if (charCode === 38) {
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PDFViewer.goToNextPage();
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this.select();
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}
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// Down arrow key.
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else if (charCode === 40) {
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PDFViewer.goToPreviousPage();
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this.select();
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}
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// All other non-numeric keys (excluding Left arrow, Right arrow,
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// Backspace, and Delete keys).
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else if ((charCode < 48 || charCode > 57) &&
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charCode !== 8 && // Backspace
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charCode !== 46 && // Delete
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charCode !== 37 && // Left arrow
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charCode !== 39 // Right arrow
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) {
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return false;
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}
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return true;
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};
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PDFViewer.pageNumberInput.onkeyup = function(evt) {
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var charCode = evt.charCode || evt.keyCode;
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// All numeric keys, Backspace, and Delete.
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if ((charCode >= 48 && charCode <= 57) ||
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charCode === 8 || // Backspace
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charCode === 46 // Delete
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) {
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PDFViewer.goToPage(this.value);
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}
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this.focus();
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};
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var previousPageButton = document.getElementById('previousPageButton');
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previousPageButton.onclick = PDFViewer.goToPreviousPage;
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var nextPageButton = document.getElementById('nextPageButton');
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nextPageButton.onclick = PDFViewer.goToNextPage;
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PDFViewer.pageNumber = parseInt(PDFViewer.queryParams.page) || PDFViewer.pageNumber;
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PDFViewer.open(PDFViewer.queryParams.file || PDFViewer.url);
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window.onscroll = function(evt) {
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var lastPagesDrawn = PDFViewer.lastPagesDrawn;
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var visiblePages = PDFViewer.visiblePages();
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var pagesToDraw = [];
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var pagesToKeep = [];
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var pagesToRemove = [];
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var i;
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// Determine which visible pages were not previously drawn.
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for (i = 0; i < visiblePages.length; i++) {
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if (lastPagesDrawn.indexOf(visiblePages[i]) === -1) {
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pagesToDraw.push(visiblePages[i]);
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PDFViewer.drawPage(visiblePages[i]);
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} else {
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pagesToKeep.push(visiblePages[i]);
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}
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}
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// Determine which previously drawn pages are no longer visible.
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for (i = 0; i < lastPagesDrawn.length; i++) {
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if (visiblePages.indexOf(lastPagesDrawn[i]) === -1) {
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pagesToRemove.push(lastPagesDrawn[i]);
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PDFViewer.removePage(lastPagesDrawn[i]);
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}
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}
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PDFViewer.lastPagesDrawn = pagesToDraw.concat(pagesToKeep);
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};
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};
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