Unify the multi_page_viewer and the basic viewer
This commit is contained in:
Vivien Nicolas
parent
fad6e36a80
commit
0edb6546a5
8 changed files with 435 additions and 1000 deletions
368
web/viewer.js
368
web/viewer.js
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@ -3,108 +3,298 @@
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'use strict';
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var pdfDocument, canvas, pageScale, pageDisplay, pageNum, numPages;
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function load(userInput) {
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canvas = document.getElementById('canvas');
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canvas.mozOpaque = true;
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pageNum = ('page' in queryParams()) ? parseInt(queryParams().page) : 1;
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pageScale = ('scale' in queryParams()) ? parseInt(queryParams().scale) : 1.5;
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var fileName = userInput;
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if (!userInput) {
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fileName = queryParams().file || 'compressed.tracemonkey-pldi-09.pdf';
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}
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open(fileName);
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}
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var kDefaultURL = 'compressed.tracemonkey-pldi-09.pdf';
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var kDefaultScale = 150;
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function queryParams() {
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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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var PDFView = {
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pages: [],
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thumbnails: [],
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function open(url) {
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document.title = url;
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if (url.indexOf("http") == 0)
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return;
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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 || req.mozResponse ||
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req.responseArrayBuffer || req.response);
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loadDocument(data);
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set scale(val) {
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var options = document.getElementById('scaleSelect').options;
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for (var i = 0; i < options.length; i++) {
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var option = options[i];
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option.selected = (option.value == val);
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}
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};
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req.send(null);
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}
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window.addEventListener("pdfloaded", function(aEvent) {
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loadDocument(aEvent.detail);
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var pages = this.pages;
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var cssUnits = 96.0 / 72.0;
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for (var i = 0; i < pages.length; i++)
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pages[i].update(val / 100 * cssUnits);
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// Jump the scroll position to the correct page.
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this.page = this.page;
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},
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set page(val) {
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var pages = this.pages;
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var input = document.getElementById("pageNumber");
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if (val <= 0 || val > pages.length) {
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input.value = this.page;
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return;
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}
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document.location.hash = val;
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document.getElementById("previous").disabled = (val == 1);
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document.getElementById("next").disabled = (val == pages.length);
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if (input.value == val)
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return;
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input.value = val;
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pages[val - 1].draw();
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},
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get page() {
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return parseInt(document.location.hash.substring(1)) || 1;
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},
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open: function(url, scale) {
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if (url.indexOf("http") == 0)
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return;
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document.title = url;
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var xhr = new XMLHttpRequest();
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xhr.open('GET', url);
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xhr.mozResponseType = xhr.responseType = 'arraybuffer';
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xhr.expected = (document.URL.indexOf('file:') === 0) ? 0 : 200;
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xhr.onreadystatechange = function() {
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if (xhr.readyState === 4 && xhr.status === xhr.expected) {
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var data = (xhr.mozResponseArrayBuffer || xhr.mozResponse ||
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xhr.responseArrayBuffer || xhr.response);
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PDFView.load(data, scale);
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}
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};
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xhr.send(null);
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},
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load: function(data, scale) {
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var sidebar = document.getElementById('sidebarView');
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sidebar.parentNode.scrollTop = 0;
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while (sidebar.hasChildNodes())
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sidebar.removeChild(sidebar.lastChild);
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clearInterval(sidebar._loadingInterval);
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var container = document.getElementById('viewer');
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while (container.hasChildNodes())
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container.removeChild(container.lastChild);
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var pdf = new PDFDoc(new Stream(data));
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var pagesCount = pdf.numPages;
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document.getElementById('numPages').innerHTML = pagesCount;
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var pages = this.pages = [];
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var thumbnails = this.thumbnails = [];
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for (var i = 1; i <= pagesCount; i++) {
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var page = pdf.getPage(i);
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var mediaBox = page.mediaBox;
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var width = (mediaBox[2] - mediaBox[0]);
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var height = (mediaBox[3] - mediaBox[1]);
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pages.push(new PageView(container, page, i, width, height, page.stats));
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thumbnails.push(new ThumbnailView(sidebar, pages[i - 1]));
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};
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this.scale = (scale || kDefaultScale);
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this.page = parseInt(document.location.hash.substring(1)) || 1;
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},
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getVisiblePages: function() {
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var pages = this.pages;
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var kBottomMargin = 10;
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var visiblePages = [];
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var currentHeight = kBottomMargin;
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var windowTop = window.pageYOffset;
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for (var i = 1; i <= pages.length; i++) {
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var page = pages[i - 1];
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var pageHeight = page.height * page.scale + kBottomMargin;
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if (currentHeight + pageHeight > windowTop)
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break;
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currentHeight += pageHeight;
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}
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var windowBottom = window.pageYOffset + window.innerHeight;
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for (; i <= pages.length && currentHeight < windowBottom; i++) {
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var page = pages[i - 1];
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visiblePages.push({ id: page.id, y: currentHeight });
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currentHeight += page.height * page.scale + kBottomMargin;
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}
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return visiblePages;
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},
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};
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var PageView = function(container, content, id, width, height, stats) {
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this.width = width;
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this.height = height;
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this.id = id;
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this.content = content;
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var anchor = document.createElement('a');
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anchor.name = '' + this.id;
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var div = document.createElement('div');
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div.id = 'pageContainer' + this.id;
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div.className = 'page';
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container.appendChild(anchor);
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container.appendChild(div);
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this.update = function(scale) {
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this.scale = scale;
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div.style.width = (this.width * this.scale)+ 'px';
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div.style.height = (this.height * this.scale) + 'px';
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while (div.hasChildNodes())
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div.removeChild(div.lastChild);
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};
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this.draw = function() {
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if (div.hasChildNodes()) {
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this.updateStats();
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return;
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}
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var canvas = document.createElement('canvas');
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canvas.id = 'page' + this.id;
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canvas.mozOpaque = true;
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canvas.width = this.width * this.scale;
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canvas.height = this.height * this.scale;
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div.appendChild(canvas);
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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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stats.begin = Date.now();
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this.content.startRendering(ctx, this.updateStats);
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};
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this.updateStats = function() {
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var t1 = stats.compile, t2 = stats.fonts, t3 = stats.render;
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var str = 'Time to compile/fonts/render: ' +
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(t1 - stats.begin) + '/' + (t2 - t1) + '/' + (t3 - t2) + ' ms';
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document.getElementById('info').innerHTML = str;
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};
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};
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var ThumbnailView = function(container, page) {
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var anchor = document.createElement('a');
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anchor.href = '#' + page.id;
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var div = document.createElement('div');
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div.id = 'thumbnailContainer' + page.id;
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div.className = 'thumbnail';
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anchor.appendChild(div);
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container.appendChild(anchor);
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this.draw = function() {
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if (div.hasChildNodes())
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return;
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var canvas = document.createElement('canvas');
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canvas.id = 'thumbnail' + page.id;
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canvas.mozOpaque = true;
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canvas.width = 104;
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canvas.height = 134;
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div.appendChild(canvas);
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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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page.content.startRendering(ctx, function() { });
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};
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};
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window.addEventListener('load', function(evt) {
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var params = document.location.search.substring(1).split('&');
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for (var i = 0; i < params.length; i++) {
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var param = params[i].split('=');
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params[unescape(param[0])] = unescape(param[1]);
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}
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PDFView.open(params.file || kDefaultURL, parseInt(params.scale));
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if (!window.File || !window.FileReader || !window.FileList || !window.Blob)
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document.getElementById('fileInput').style.display = 'none';
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else
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document.getElementById('fileInput').value = null;
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}, true);
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function loadDocument(data) {
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pdfDocument = new PDFDoc(new Stream(data));
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numPages = pdfDocument.numPages;
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document.getElementById('numPages').innerHTML = numPages.toString();
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goToPage(pageNum);
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}
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window.addEventListener('pdfloaded', function(evt) {
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PDFView.load(evt.detail);
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}, true);
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function gotoPage(num) {
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if (0 <= num && num <= numPages)
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pageNum = num;
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displayPage(pageNum);
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}
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window.addEventListener('scroll', function(evt) {
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var visiblePages = PDFView.getVisiblePages();
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for (var i = 0; i < visiblePages.length; i++)
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PDFView.pages[visiblePages[i].id - 1].draw();
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function displayPage(num) {
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document.getElementById('pageNumber').value = num;
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if (!visiblePages.length)
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return;
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var t0 = Date.now();
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var currentId = PDFView.page;
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var firstPage = visiblePages[0];
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var lastPage = visiblePages[visiblePages.length - 1];
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if (currentId > lastPage.id && lastPage.y > window.pageYOffset)
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PDFView.page = lastPage.id;
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else if (currentId < firstPage.id)
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PDFView.page = firstPage.id;
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}, true);
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var page = pdfDocument.getPage(pageNum = num);
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window.addEventListener("hashchange", function(evt) {
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PDFView.page = PDFView.page;
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});
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var pdfToCssUnitsCoef = 96.0 / 72.0;
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var pageWidth = (page.mediaBox[2] - page.mediaBox[0]);
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var pageHeight = (page.mediaBox[3] - page.mediaBox[1]);
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canvas.width = pageScale * pageWidth * pdfToCssUnitsCoef;
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canvas.height = pageScale * pageHeight * pdfToCssUnitsCoef;
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window.addEventListener("change", function(evt) {
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var files = evt.target.files;
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if (!files || files.length == 0)
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return;
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var t1 = Date.now();
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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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// Read the local file into a Uint8Array.
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var fileReader = new FileReader();
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fileReader.onload = function(evt) {
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var data = evt.target.result;
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var buffer = new ArrayBuffer(data.length);
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var uint8Array = new Uint8Array(buffer);
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page.startRendering(
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ctx,
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function() {
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var infoDisplay = document.getElementById('info');
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var stats = page.stats;
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var t2 = stats.compile, t3 = stats.fonts, t4 = stats.render;
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infoDisplay.innerHTML = 'Time to load/compile/fonts/render: ' +
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(t1 - t0) + '/' + (t2 - t1) + '/' + (t3 - t2) + '/' + (t4 - t3) + ' ms';
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});
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}
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for (var i = 0; i < data.length; i++)
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uint8Array[i] = data.charCodeAt(i);
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PDFView.load(uint8Array);
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};
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function nextPage() {
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if (pageNum < pdfDocument.numPages)
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displayPage(++pageNum);
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}
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// Read as a binary string since "readAsArrayBuffer" is not yet
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// implemented in Firefox.
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var file = files[0];
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fileReader.readAsBinaryString(file);
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function prevPage() {
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if (pageNum > 1)
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displayPage(--pageNum);
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}
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document.title = file.name;
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document.location.hash = 1;
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}, true);
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window.addEventListener("transitionend", function(evt) {
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var pageIndex = 0;
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var pagesCount = PDFView.pages.length;
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var container = document.getElementById('sidebarView');
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container._interval = window.setInterval(function() {
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if (pageIndex >= pagesCount)
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return window.clearInterval(container._interval);
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PDFView.thumbnails[pageIndex++].draw();
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}, 500);
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}, true);
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function goToPage(num) {
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if (0 <= num && num <= numPages)
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displayPage(pageNum = num);
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}
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