mirror of
https://github.com/overleaf/overleaf.git
synced 2024-09-16 02:52:31 -04:00
819 lines
25 KiB
JavaScript
819 lines
25 KiB
JavaScript
(function (name, context, definition) {
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if (typeof module != 'undefined' && module.exports) module.exports = definition()
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else if (typeof define == 'function' && define.amd) define(definition)
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else context[name] = definition()
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})('PDFListView', this, function (name, context) {
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//#expand __BUNDLE__
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function Logger() {
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this.logLevel = Logger.INFO;
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var self = this;
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if (typeof(console) == "object" && typeof(console.log) == "function") {
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this.debug = function() {
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if (self.logLevel <= Logger.DEBUG) {
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console.log.apply(console, arguments);
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}
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};
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this.info = function() {
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if (self.logLevel <= Logger.INFO) {
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console.log.apply(console, arguments);
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}
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};
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this.error = function() {
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if (self.logLevel <= Logger.ERROR) {
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console.log.apply(console, arguments);
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}
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};
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} else {
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this.debug = this.info = this.error = function nop() {};
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}
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}
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Logger.DEBUG = 0;
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Logger.INFO = 1;
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Logger.ERROR = 2;
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var logger = new Logger();
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function _flat(arr) {
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var res = arr.reduce(function(a, b) {
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return a.concat(b);
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});
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return res;
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}
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function failDumper(err) {
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logger.error(err);
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}
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if (typeof(PDFJS) === "undefined") {
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logger.error("PDF.js is not yet loaded.");
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}
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// -----------------------------------------------------------------------------
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/**
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* Wrapper around the raw PDF.JS document.
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*/
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function Document(url, password, onProgress) {
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this.pdfDocument = null;
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this.pages = null;
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var parameters = {password: password};
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if (typeof url === 'string') { // URL
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parameters.url = url;
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} else if (url && 'byteLength' in url) { // ArrayBuffer
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parameters.data = url;
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}
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this.initialized = new PDFJS.LegacyPromise();
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PDFJS.getDocument(parameters, null, null, onProgress).then(this.loadPages.bind(this), failDumper);
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}
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Document.prototype.loadPages = function(pdfDocument) {
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this.pdfDocument = pdfDocument;
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var pagesCount = this.pagesCount = pdfDocument.numPages;
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var pagePromises = [];
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for (var i = 1; i <= pagesCount; i++) {
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pagePromises.push(pdfDocument.getPage(i));
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}
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this.pageRefMap = pageRefMap = {};
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var pagesPromise = Promise.all(pagePromises);
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var doc = this
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pagesPromise.then(function(promisedPages) {
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doc.pages = promisedPages.map(function(pdfPage, i) {
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var pageRef = pdfPage.ref
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pageRefMap[pageRef.num + ' ' + pageRef.gen] = i;
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return new Page(pdfPage);
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});
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});
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var destinationsPromise = pdfDocument.getDestinations();
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destinationsPromise.then(function(destinations) {
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doc.destinations = destinations;
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});
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Promise.all([pagesPromise, destinationsPromise]).then(function() {
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doc.initialized.resolve();
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}, failDumper);
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};
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/**
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* Handles the rendering. Multiple ListViews can be bound to a RenderController.
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* In that case, the RenderController figures out what's page has the highest
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* priority to render
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*/
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function RenderController() {
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this.listViews = [];
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this.renderList = [];
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}
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RenderController.prototype = {
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addListView: function(listView) {
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// TODO: assert listView not already in list of this.listView
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this.listViews.push(listView);
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},
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updateRenderList: function() {
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this.renderList = _flat(this.listViews.map(function(listView) {
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return listView.getPagesToRender();
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}));
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// TODO: Some "highest-priority" sorting algorithm on the renderList.
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this.doRender();
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},
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pageToRender: function() {
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if (this.renderList.length === 0) return null;
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return this.renderList[0];
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},
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doRender: function() {
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var pageToRender = this.pageToRender();
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if (!pageToRender) return;
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pageToRender.render(this);
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},
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finishedRendering: function(pageView) {
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var idx = this.renderList.indexOf(pageView);
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// If the finished pageView is in the list of pages to render,
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// then remove it from the list and render start rendering the
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// next page.
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if (idx !== -1) {
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this.renderList.splice(idx, 1);
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this.doRender();
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}
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},
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onResize: function() {
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var renderAgain = false
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this.listViews.map(function(listView) {
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if (listView.calculateScale()) {
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listView.layout();
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renderAgain = true;
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}
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});
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if (renderAgain) {
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this.updateRenderList();
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}
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}
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};
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var LAYOUT_SINGLE = 'layout_single';
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var SCALE_MODE_AUTO = 'scale_mode_auto';
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var SCALE_MODE_VALUE = 'scale_mode_value';
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var SCALE_MODE_FIT_WIDTH = 'scale_mode_fit_width';
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var SCALE_MODE_FIT_HEIGHT = 'scale_mode_fit_height';
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/**
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* Main view that holds the single pageContainer/pageViews of the pdfDoc.
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*/
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function ListView(dom, options) {
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this.dom = dom;
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this.options = options;
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this.pageLayout = LAYOUT_SINGLE;
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this.scaleMode = SCALE_MODE_VALUE;
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this.scale = 1.0;
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this.pageWidthOffset = 0;
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this.pageHeightOffset = 0;
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this.pageViews = [];
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this.containerViews = [];
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}
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ListView.prototype = {
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setDocument: function(pdfDoc) {
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this.clearPages();
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this.pdfDoc = pdfDoc;
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this.assignPagesToContainer();
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this.layout();
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},
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clearPages: function() {
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var self = this;
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this.containerViews.map(function(container) {
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self.dom.removeChild(container.dom);
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});
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this.pageViews = [];
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this.containerViews = [];
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},
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assignPagesToContainer: function() {
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// TODO: Handle multiple layout types here. For now, assume to have one page
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// per pageContainer.
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this.pdfDoc.pages.map(function(page) {
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var pageView = new PageView(page, this);
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this.pageViews.push(pageView);
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var container = new PageContainerView(this);
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container.setPageView(pageView, 0);
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this.containerViews.push(container);
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this.dom.appendChild(container.dom);
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}, this);
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},
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layout: function() {
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this.savePdfPosition();
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this.containerViews.forEach(function(containerView) {
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containerView.layout();
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});
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this.restorePdfPosition();
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},
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getScale: function() {
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return this.scale;
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},
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getScaleMode: function() {
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return this.scaleMode;
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},
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setScaleMode: function(scaleMode, scale) {
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this.scaleMode = scaleMode;
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if (scaleMode == SCALE_MODE_VALUE) {
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this.scale = scale;
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}
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this.calculateScale();
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this.layout();
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},
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setScale: function(scale) {
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this.setScaleMode(SCALE_MODE_VALUE, scale);
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},
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setToAutoScale: function() {
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this.setScaleMode(SCALE_MODE_AUTO);
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},
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setToFitWidth: function() {
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this.setScaleMode(SCALE_MODE_FIT_WIDTH);
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},
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setToFitHeight: function() {
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this.setScaleMode(SCALE_MODE_FIT_HEIGHT);
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},
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// Calculates the new scale. Returns `true` if the scale changed.
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calculateScale: function() {
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var newScale = this.scale;
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var oldScale = newScale;
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var scaleMode = this.scaleMode;
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if (scaleMode === SCALE_MODE_FIT_WIDTH || scaleMode === SCALE_MODE_AUTO) {
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var clientWidth = this.dom.clientWidth;
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if (clientWidth == 0) {
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logger.debug("LIST VIEW NOT VISIBLE")
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return false;
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}
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var maxNormalWidth = 0;
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this.containerViews.forEach(function(containerView) {
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maxNormalWidth = Math.max(maxNormalWidth, containerView.normalWidth);
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});
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var scale = (clientWidth - this.pageWidthOffset)/maxNormalWidth;
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if (scaleMode === SCALE_MODE_AUTO) {
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scale = Math.min(1.0, scale);
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}
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newScale = scale;
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} else if (scaleMode === SCALE_MODE_FIT_HEIGHT) {
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var clientHeight = this.dom.clientHeight;
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if (clientHeight == 0) {
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logger.debug("LIST VIEW NOT VISIBLE")
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return false;
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}
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var maxNormalHeight = 0;
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this.containerViews.forEach(function(containerView) {
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maxNormalHeight = Math.max(maxNormalHeight, containerView.normalHeight);
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});
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newScale = (clientHeight - this.pageHeightOffset)/maxNormalHeight;
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}
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this.scale = newScale;
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return newScale !== oldScale;
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},
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getPagesToRender: function() {
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// Cache these results to avoid dom access.
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this.scrollTop = this.dom.scrollTop;
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this.scrollBottom = this.scrollTop + this.dom.clientHeight;
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// TODO: For now, this only returns the visible pages and not
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// +1/-1 one to render in advance.
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return this.pageViews.filter(function(pageView) {
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var isVisible = pageView.isVisible();
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if (isVisible && !pageView.isRendered) {
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return true;
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}
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});
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},
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navigateTo: function(destRef) {
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var destination = this.pdfDoc.destinations[destRef]
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if (typeof destination !== "object") {
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return;
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}
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logger.debug("NAVIGATING TO", destination);
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var pageRef = destination[0];
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var pageNumber = this.pdfDoc.pageRefMap[pageRef.num + ' ' + pageRef.gen];
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if (typeof pageNumber !== "number") {
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return;
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}
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logger.debug("PAGE NUMBER", pageNumber);
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var pageView = this.pageViews[pageNumber];
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var destinationType = destination[1].name;
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switch(destinationType) {
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case "XYZ":
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var x = destination[2];
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var y = destination[3];
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break;
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default:
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// TODO
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return;
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}
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var position = pageView.getPdfPositionInViewer(x,y);
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this.dom.scrollTop = position.top;
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this.dom.scrollLeft = position.left;
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},
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savePdfPosition: function() {
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this.pdfPosition = this.getPdfPosition();
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logger.debug("SAVED PDF POSITION", this.pdfPosition);
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},
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restorePdfPosition: function() {
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logger.debug("RESTORING PDF POSITION", this.pdfPosition);
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this.setPdfPosition(this.pdfPosition);
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},
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getPdfPosition: function() {
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var pdfPosition = null;
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for (var i = 0; i < this.pageViews.length; i++) {
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var pageView = this.pageViews[i];
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var pdfOffset = pageView.getUppermostVisiblePdfOffset();
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if (pdfOffset !== null) {
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pdfPosition = {
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page: i,
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offset: {
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top: pdfOffset,
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left: 0 // TODO
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}
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}
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break;
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}
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}
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return pdfPosition;
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},
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setPdfPosition: function(pdfPosition) {
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if (typeof pdfPosition !== "undefined" && pdfPosition != null) {
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var offset = pdfPosition.offset;
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var page_index = pdfPosition.page;
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var pageView = this.pageViews[page_index];
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var position = pageView.getPdfPositionInViewer(offset.left, offset.top);
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this.dom.scrollTop = position.top;
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}
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}
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};
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/*
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* A PageContainerView holds multiple PageViews. E.g. in a two-page layout,
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* every pageContainerView holds two PageViews and is responsible to layout
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* them.
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*/
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function PageContainerView(listView) {
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this.listView = listView;
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var dom = this.dom = document.createElement('div');
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dom.className = 'plv-page-container page-container';
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this.pages = [];
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}
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PageContainerView.prototype = {
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setPageView: function(pageView, idx) {
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// TODO: handle case if there is already a page here
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this.pages[idx] = pageView;
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// TODO: handle page idx properly
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this.dom.appendChild(pageView.dom);
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},
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removePageView: function(idx) {
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// TODO: check if idx is set on page[]
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this.dom.removeChild(this.pages[idx].dom);
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},
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layout: function() {
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var scale = this.listView.scale;
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var normalWidth = 0;
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var normalHeight = 0;
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this.pages.forEach(function(pageView) {
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pageView.layout();
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normalWidth += pageView.normalWidth;
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normalHeight = Math.max(pageView.normalHeight, normalHeight);
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});
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this.normalWidth = normalWidth;
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this.normalHeight = normalHeight;
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this.dom.style.width = (normalWidth * scale) + 'px';
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this.dom.style.height = (normalHeight * scale) + 'px';
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}
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};
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var RenderingStates = {
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INITIAL: 0,
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RUNNING: 1,
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PAUSED: 2,
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FINISHED: 3
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};
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var idCounter = 0;
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/**
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* The view for a single page.
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*/
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function PageView(page, listView) {
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this.page = page;
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this.listView = listView;
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this.id = idCounter++;
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this.number = this.page.number;
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this.rotation = 0;
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this.isRendered = false;
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this.renderState = RenderingStates.INITIAL;
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var dom = this.dom = document.createElement('div');
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dom.className = "plv-page-view page-view";
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this.createNewCanvas();
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}
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PageView.prototype = {
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layout: function() {
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var scale = this.listView.scale;
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var viewport = this.viewport =
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this.page.pdfPage.getViewport(scale, this.rotation);
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this.normalWidth = viewport.width / scale;
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this.normalHeight = viewport.height / scale;
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// Only change the width/height property of the canvas if it really
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// changed. Every assignment to the width/height property clears the
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// content of the canvas.
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var newWidth = Math.floor(viewport.width);
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var newHeight = Math.floor(viewport.height);
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if (this.canvas.width !== newWidth) {
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this.canvas.width = newWidth;
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this.resetRenderState();
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}
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if (this.canvas.height !== newHeight) {
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this.canvas.height = newHeight;
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this.resetRenderState();
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}
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this.width = viewport.width;
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this.height = viewport.height;
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},
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isVisible: function() {
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var listView = this.listView;
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var dom = this.dom;
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var offsetTop = dom.offsetTop;
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var offsetBottom = offsetTop + this.height;
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return offsetBottom >= listView.scrollTop &&
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offsetTop <= listView.scrollBottom;
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},
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resetRenderState: function() {
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this.renderState = RenderingStates.INITIAL;
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this.isRendered = false;
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if (this.textLayerDiv) {
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this.dom.removeChild(this.textLayerDiv);
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delete this.textLayerDiv;
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}
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if (this.annotationsLayerDiv) {
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this.dom.removeChild(this.annotationsLayerDiv);
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delete this.annotationsLayerDiv;
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}
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},
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render: function(renderController) {
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return this.page.render(this, renderController);
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},
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getCanvasContext: function() {
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return this.canvas.getContext('2d');
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},
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createNewCanvas: function() {
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if (this.canvas) {
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this.dom.removeChild(this.canvas);
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}
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var canvas = this.canvas = document.createElement('canvas');
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this.dom.appendChild(canvas);
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this.layout();
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},
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pdfPositionToPixels: function(x, y) {
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return this.viewport.convertToViewportPoint(x, y);
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},
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getCanvasPositionInViewer: function() {
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return {
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left: this.canvas.offsetLeft + this.dom.offsetLeft,
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top: this.canvas.offsetTop + this.dom.offsetTop
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}
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},
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getPdfPositionInViewer: function(x, y) {
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pageOffset = this.pdfPositionToPixels(x, y);
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canvasOffset = this.getCanvasPositionInViewer();
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return {
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left: canvasOffset.left + pageOffset[0],
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top: canvasOffset.top + pageOffset[1]
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}
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},
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getUppermostVisibleCanvasOffset: function() {
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var pagePosition = this.getCanvasPositionInViewer();
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var pageHeight = this.canvas.height;
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var viewportTop = this.listView.dom.scrollTop;
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var viewportHeight = this.listView.dom.clientHeight;
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|
// Check if the top of the page is showing, i.e:
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// _______________
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// | |
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// | ........ |
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// | . . |
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// ----.------.---
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// . .
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// ........
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var topVisible = (pagePosition.top > viewportTop && pagePosition.top < viewportTop + viewportHeight);
|
|
// Check if at least some of the page is showing, i.e:
|
|
// ........ ........
|
|
// ____.______.___ ---.------.---
|
|
// | . . | or | . . |
|
|
// | . . | | . . |
|
|
// | ........ | | . . |
|
|
// --------------- ---.------.---
|
|
// ........
|
|
var someContentVisible = (pagePosition.top < viewportTop && pagePosition.top + pageHeight > viewportTop);
|
|
if (topVisible) {
|
|
return 0;
|
|
} else if (someContentVisible) {
|
|
return viewportTop - pagePosition.top;
|
|
} else {
|
|
return null;
|
|
}
|
|
},
|
|
|
|
getUppermostVisiblePdfOffset: function() {
|
|
var canvasOffset = this.getUppermostVisibleCanvasOffset();
|
|
if (canvasOffset === null) {
|
|
return null;
|
|
}
|
|
var pdfOffset = this.viewport.convertToPdfPoint(0, canvasOffset);
|
|
return pdfOffset[1];
|
|
}
|
|
};
|
|
|
|
/**
|
|
* An abstraction around the raw page object of PDF.JS, that also handles the
|
|
* rendering logic of (maybe multiple) pageView(s) that are based on this page.
|
|
*/
|
|
function Page(pdfPage, number) {
|
|
this.number = number;
|
|
this.pdfPage = pdfPage;
|
|
|
|
this.renderContextList = {};
|
|
}
|
|
|
|
Page.prototype = {
|
|
render: function(pageView, renderController) {
|
|
var renderContext;
|
|
|
|
// FEATURE: If the page was rendered already once, then use the old
|
|
// version as a placeholder until the new version is rendered at the
|
|
// expected quality.
|
|
|
|
// FEATURE: If the page can be rendered at low quality (thumbnail) and
|
|
// there is already a higher resolution rendering, then use this one
|
|
// instead of rerendering from scratch again.
|
|
|
|
// PageView is not layouted.
|
|
if (!pageView.viewport) return;
|
|
|
|
// Nothing todo.
|
|
if (pageView.isRendered) return;
|
|
|
|
// Not most important page to render ATM.
|
|
if (renderController.pageToRender() !== pageView) return;
|
|
|
|
var self = this;
|
|
var viewport;
|
|
if (renderContext = this.renderContextList[pageView.id]) {
|
|
viewport = renderContext.viewport;
|
|
|
|
// TODO: handle rotation
|
|
if (viewport.height !== pageView.viewport.height ||
|
|
viewport.height !== pageView.viewport.height)
|
|
{
|
|
// The viewport changed -> need to rerender.
|
|
renderContext.abandon = true;
|
|
delete self.renderContextList[pageView.id];
|
|
pageView.createNewCanvas();
|
|
self.render(pageView, renderController);
|
|
} else if (renderContext.state === RenderingStates.PAUSED) {
|
|
// There is already a not finished renderState ->
|
|
logger.debug('RESUME', pageView.id);
|
|
renderContext.resume();
|
|
}
|
|
}
|
|
|
|
if (!renderContext) {
|
|
viewport = pageView.viewport;
|
|
// No rendering data yet -> create a new renderContext and start
|
|
// the rendering process.
|
|
|
|
var textLayer;
|
|
var textLayerBuilder = pageView.listView.options.textLayerBuilder;
|
|
if (textLayerBuilder) {
|
|
var textLayerDiv = pageView.textLayerDiv = document.createElement("div");
|
|
textLayerDiv.className = 'plv-text-layer text-layer';
|
|
pageView.dom.appendChild(textLayerDiv);
|
|
textLayer = new textLayerBuilder(textLayerDiv);
|
|
this.pdfPage.getTextContent().then(
|
|
function(textContent) {
|
|
textLayer.setTextContent(textContent);
|
|
}
|
|
);
|
|
}
|
|
|
|
var annotationsLayerBuilder = pageView.listView.options.annotationsLayerBuilder;
|
|
if (annotationsLayerBuilder) {
|
|
var annotationsLayerDiv = pageView.annotationsLayerDiv = document.createElement("div");
|
|
annotationsLayerDiv.className = 'plv-annotations-layer annotations-layer';
|
|
pageView.dom.appendChild(annotationsLayerDiv);
|
|
var annotationsLayer = new annotationsLayerBuilder(pageView, annotationsLayerDiv);
|
|
this.pdfPage.getAnnotations().then(
|
|
function(annotations) {
|
|
annotationsLayer.setAnnotations(annotations)
|
|
}
|
|
);
|
|
}
|
|
|
|
renderContext = {
|
|
canvasContext: pageView.getCanvasContext(),
|
|
viewport: viewport,
|
|
textLayer: textLayer,
|
|
continueCallback: function pdfViewContinueCallback(cont) {
|
|
if (renderContext.abandon) {
|
|
logger.debug("ABANDON", pageView.id);
|
|
return;
|
|
}
|
|
|
|
if (renderController.pageToRender() !== pageView) {
|
|
logger.debug('PAUSE', pageView.id);
|
|
renderContext.state = RenderingStates.PAUSED;
|
|
renderContext.resume = function resumeCallback() {
|
|
renderContext.state = RenderingStates.RUNNING;
|
|
cont();
|
|
};
|
|
return;
|
|
}
|
|
logger.debug('CONT', pageView.id);
|
|
cont();
|
|
}
|
|
};
|
|
this.renderContextList[pageView.id] = renderContext;
|
|
|
|
logger.debug("BEGIN", pageView.id);
|
|
renderContext.renderPromise = this.pdfPage.render(renderContext).promise;
|
|
renderContext.renderPromise.then(
|
|
function pdfPageRenderCallback() {
|
|
logger.debug('DONE', pageView.id);
|
|
pageView.isRendered = true;
|
|
renderController.finishedRendering(pageView);
|
|
},
|
|
failDumper
|
|
);
|
|
}
|
|
|
|
return renderContext.renderPromise;
|
|
}
|
|
};
|
|
|
|
function PDFListView(mainDiv, options) {
|
|
if (typeof(options) != "object") {
|
|
options = {};
|
|
}
|
|
if (typeof(options.logLevel) != "number") {
|
|
options.logLevel = Logger.INFO;
|
|
}
|
|
logger.logLevel = options.logLevel;
|
|
|
|
this.listView = new ListView(mainDiv, options);
|
|
|
|
this.renderController = new RenderController();
|
|
this.renderController.addListView(this.listView);
|
|
this.renderController.updateRenderList();
|
|
|
|
var self = this;
|
|
|
|
mainDiv.addEventListener('scroll', function() {
|
|
// This will update the list AND start rendering if needed.
|
|
self.renderController.updateRenderList();
|
|
});
|
|
|
|
window.addEventListener('resize', function() {
|
|
// Check if the scale changed due to the resizing.
|
|
if (self.listView.calculateScale()) {
|
|
// Update the layout and start rendering. Changing the layout
|
|
// of the PageView makes it rendering stop.
|
|
self.listView.layout();
|
|
self.renderController.updateRenderList();
|
|
}
|
|
});
|
|
}
|
|
|
|
PDFListView.prototype = {
|
|
loadPdf: function(url, onProgress) {
|
|
this.doc = new Document(url, null, onProgress);
|
|
var self = this;
|
|
var promise = this.doc.initialized;
|
|
promise.then(function() {
|
|
logger.debug('LOADED');
|
|
self.listView.setDocument(self.doc);
|
|
self.renderController.updateRenderList();
|
|
}, failDumper);
|
|
return promise;
|
|
},
|
|
|
|
getScale: function() {
|
|
return this.listView.getScale();
|
|
},
|
|
|
|
getScaleMode: function() {
|
|
return this.listView.getScaleMode()
|
|
},
|
|
|
|
setScaleMode: function(scaleMode, scale) {
|
|
this.listView.setScaleMode(scaleMode, scale);
|
|
this.renderController.updateRenderList();
|
|
},
|
|
|
|
setScale: function(scale) {
|
|
this.listView.setScale(scale);
|
|
this.renderController.updateRenderList();
|
|
},
|
|
|
|
setToAutoScale: function() {
|
|
this.listView.setToAutoScale();
|
|
this.renderController.updateRenderList();
|
|
},
|
|
|
|
setToFitWidth: function() {
|
|
this.listView.setToFitWidth();
|
|
this.renderController.updateRenderList();
|
|
},
|
|
|
|
setToFitHeight: function() {
|
|
this.listView.setToFitHeight();
|
|
this.renderController.updateRenderList();
|
|
},
|
|
|
|
onResize: function() {
|
|
this.renderController.onResize();
|
|
},
|
|
|
|
getPdfPosition: function() {
|
|
return this.listView.getPdfPosition();
|
|
},
|
|
|
|
setPdfPosition: function(pdfPosition) {
|
|
this.listView.setPdfPosition(pdfPosition)
|
|
}
|
|
};
|
|
PDFListView.Logger = Logger;
|
|
|
|
return PDFListView;
|
|
|
|
});
|
|
|