/* Copyright 2014 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*jshint globalstrict: false */
/* globals PDFJS, PDFViewer, PDFPageView, TextLayerBuilder, PDFLinkService,
DefaultTextLayerFactory, AnnotationLayerBuilder, PDFHistory,
DefaultAnnotationLayerFactory, DownloadManager, ProgressBar */
// Initializing PDFJS global object (if still undefined)
if (typeof PDFJS === 'undefined') {
(typeof window !== 'undefined' ? window : this).PDFJS = {};
}
(function pdfViewerWrapper() {
'use strict';
var CSS_UNITS = 96.0 / 72.0;
var DEFAULT_SCALE_VALUE = 'auto';
var DEFAULT_SCALE = 1.0;
var UNKNOWN_SCALE = 0;
var MAX_AUTO_SCALE = 1.25;
var SCROLLBAR_PADDING = 40;
var VERTICAL_PADDING = 5;
/**
* Returns scale factor for the canvas. It makes sense for the HiDPI displays.
* @return {Object} The object with horizontal (sx) and vertical (sy)
scales. The scaled property is set to false if scaling is
not required, true otherwise.
*/
function getOutputScale(ctx) {
var devicePixelRatio = window.devicePixelRatio || 1;
var backingStoreRatio = ctx.webkitBackingStorePixelRatio ||
ctx.mozBackingStorePixelRatio ||
ctx.msBackingStorePixelRatio ||
ctx.oBackingStorePixelRatio ||
ctx.backingStorePixelRatio || 1;
var pixelRatio = devicePixelRatio / backingStoreRatio;
return {
sx: pixelRatio,
sy: pixelRatio,
scaled: pixelRatio !== 1
};
}
/**
* Scrolls specified element into view of its parent.
* @param {Object} element - The element to be visible.
* @param {Object} spot - An object with optional top and left properties,
* specifying the offset from the top left edge.
* @param {boolean} skipOverflowHiddenElements - Ignore elements that have
* the CSS rule `overflow: hidden;` set. The default is false.
*/
function scrollIntoView(element, spot, skipOverflowHiddenElements) {
// Assuming offsetParent is available (it's not available when viewer is in
// hidden iframe or object). We have to scroll: if the offsetParent is not set
// producing the error. See also animationStartedClosure.
var parent = element.offsetParent;
if (!parent) {
console.error('offsetParent is not set -- cannot scroll');
return;
}
var checkOverflow = skipOverflowHiddenElements || false;
var offsetY = element.offsetTop + element.clientTop;
var offsetX = element.offsetLeft + element.clientLeft;
while (parent.clientHeight === parent.scrollHeight ||
(checkOverflow && getComputedStyle(parent).overflow === 'hidden')) {
if (parent.dataset._scaleY) {
offsetY /= parent.dataset._scaleY;
offsetX /= parent.dataset._scaleX;
}
offsetY += parent.offsetTop;
offsetX += parent.offsetLeft;
parent = parent.offsetParent;
if (!parent) {
return; // no need to scroll
}
}
if (spot) {
if (spot.top !== undefined) {
offsetY += spot.top;
}
if (spot.left !== undefined) {
offsetX += spot.left;
parent.scrollLeft = offsetX;
}
}
parent.scrollTop = offsetY;
}
/**
* Helper function to start monitoring the scroll event and converting them into
* PDF.js friendly one: with scroll debounce and scroll direction.
*/
function watchScroll(viewAreaElement, callback) {
var debounceScroll = function debounceScroll(evt) {
if (rAF) {
return;
}
// schedule an invocation of scroll for next animation frame.
rAF = window.requestAnimationFrame(function viewAreaElementScrolled() {
rAF = null;
var currentY = viewAreaElement.scrollTop;
var lastY = state.lastY;
if (currentY !== lastY) {
state.down = currentY > lastY;
}
state.lastY = currentY;
callback(state);
});
};
var state = {
down: true,
lastY: viewAreaElement.scrollTop,
_eventHandler: debounceScroll
};
var rAF = null;
viewAreaElement.addEventListener('scroll', debounceScroll, true);
return state;
}
/**
* Helper function to parse query string (e.g. ?param1=value&parm2=...).
*/
function parseQueryString(query) {
var parts = query.split('&');
var params = {};
for (var i = 0, ii = parts.length; i < ii; ++i) {
var param = parts[i].split('=');
var key = param[0].toLowerCase();
var value = param.length > 1 ? param[1] : null;
params[decodeURIComponent(key)] = decodeURIComponent(value);
}
return params;
}
/**
* Use binary search to find the index of the first item in a given array which
* passes a given condition. The items are expected to be sorted in the sense
* that if the condition is true for one item in the array, then it is also true
* for all following items.
*
* @returns {Number} Index of the first array element to pass the test,
* or |items.length| if no such element exists.
*/
function binarySearchFirstItem(items, condition) {
var minIndex = 0;
var maxIndex = items.length - 1;
if (items.length === 0 || !condition(items[maxIndex])) {
return items.length;
}
if (condition(items[minIndex])) {
return minIndex;
}
while (minIndex < maxIndex) {
var currentIndex = (minIndex + maxIndex) >> 1;
var currentItem = items[currentIndex];
if (condition(currentItem)) {
maxIndex = currentIndex;
} else {
minIndex = currentIndex + 1;
}
}
return minIndex; /* === maxIndex */
}
/**
* Approximates float number as a fraction using Farey sequence (max order
* of 8).
* @param {number} x - Positive float number.
* @returns {Array} Estimated fraction: the first array item is a numerator,
* the second one is a denominator.
*/
function approximateFraction(x) {
// Fast paths for int numbers or their inversions.
if (Math.floor(x) === x) {
return [x, 1];
}
var xinv = 1 / x;
var limit = 8;
if (xinv > limit) {
return [1, limit];
} else if (Math.floor(xinv) === xinv) {
return [1, xinv];
}
var x_ = x > 1 ? xinv : x;
// a/b and c/d are neighbours in Farey sequence.
var a = 0, b = 1, c = 1, d = 1;
// Limiting search to order 8.
while (true) {
// Generating next term in sequence (order of q).
var p = a + c, q = b + d;
if (q > limit) {
break;
}
if (x_ <= p / q) {
c = p; d = q;
} else {
a = p; b = q;
}
}
// Select closest of the neighbours to x.
if (x_ - a / b < c / d - x_) {
return x_ === x ? [a, b] : [b, a];
} else {
return x_ === x ? [c, d] : [d, c];
}
}
function roundToDivide(x, div) {
var r = x % div;
return r === 0 ? x : Math.round(x - r + div);
}
/**
* Generic helper to find out what elements are visible within a scroll pane.
*/
function getVisibleElements(scrollEl, views, sortByVisibility) {
var top = scrollEl.scrollTop, bottom = top + scrollEl.clientHeight;
var left = scrollEl.scrollLeft, right = left + scrollEl.clientWidth;
function isElementBottomBelowViewTop(view) {
var element = view.div;
var elementBottom =
element.offsetTop + element.clientTop + element.clientHeight;
return elementBottom > top;
}
var visible = [], view, element;
var currentHeight, viewHeight, hiddenHeight, percentHeight;
var currentWidth, viewWidth;
var firstVisibleElementInd = (views.length === 0) ? 0 :
binarySearchFirstItem(views, isElementBottomBelowViewTop);
for (var i = firstVisibleElementInd, ii = views.length; i < ii; i++) {
view = views[i];
element = view.div;
currentHeight = element.offsetTop + element.clientTop;
viewHeight = element.clientHeight;
if (currentHeight > bottom) {
break;
}
currentWidth = element.offsetLeft + element.clientLeft;
viewWidth = element.clientWidth;
if (currentWidth + viewWidth < left || currentWidth > right) {
continue;
}
hiddenHeight = Math.max(0, top - currentHeight) +
Math.max(0, currentHeight + viewHeight - bottom);
percentHeight = ((viewHeight - hiddenHeight) * 100 / viewHeight) | 0;
visible.push({
id: view.id,
x: currentWidth,
y: currentHeight,
view: view,
percent: percentHeight
});
}
var first = visible[0];
var last = visible[visible.length - 1];
if (sortByVisibility) {
visible.sort(function(a, b) {
var pc = a.percent - b.percent;
if (Math.abs(pc) > 0.001) {
return -pc;
}
return a.id - b.id; // ensure stability
});
}
return {first: first, last: last, views: visible};
}
/**
* Event handler to suppress context menu.
*/
function noContextMenuHandler(e) {
e.preventDefault();
}
/**
* Returns the filename or guessed filename from the url (see issue 3455).
* url {String} The original PDF location.
* @return {String} Guessed PDF file name.
*/
function getPDFFileNameFromURL(url) {
var reURI = /^(?:([^:]+:)?\/\/[^\/]+)?([^?#]*)(\?[^#]*)?(#.*)?$/;
// SCHEME HOST 1.PATH 2.QUERY 3.REF
// Pattern to get last matching NAME.pdf
var reFilename = /[^\/?#=]+\.pdf\b(?!.*\.pdf\b)/i;
var splitURI = reURI.exec(url);
var suggestedFilename = reFilename.exec(splitURI[1]) ||
reFilename.exec(splitURI[2]) ||
reFilename.exec(splitURI[3]);
if (suggestedFilename) {
suggestedFilename = suggestedFilename[0];
if (suggestedFilename.indexOf('%') !== -1) {
// URL-encoded %2Fpath%2Fto%2Ffile.pdf should be file.pdf
try {
suggestedFilename =
reFilename.exec(decodeURIComponent(suggestedFilename))[0];
} catch(e) { // Possible (extremely rare) errors:
// URIError "Malformed URI", e.g. for "%AA.pdf"
// TypeError "null has no properties", e.g. for "%2F.pdf"
}
}
}
return suggestedFilename || 'document.pdf';
}
var ProgressBar = (function ProgressBarClosure() {
function clamp(v, min, max) {
return Math.min(Math.max(v, min), max);
}
function ProgressBar(id, opts) {
this.visible = true;
// Fetch the sub-elements for later.
this.div = document.querySelector(id + ' .progress');
// Get the loading bar element, so it can be resized to fit the viewer.
this.bar = this.div.parentNode;
// Get options, with sensible defaults.
this.height = opts.height || 100;
this.width = opts.width || 100;
this.units = opts.units || '%';
// Initialize heights.
this.div.style.height = this.height + this.units;
this.percent = 0;
}
ProgressBar.prototype = {
updateBar: function ProgressBar_updateBar() {
if (this._indeterminate) {
this.div.classList.add('indeterminate');
this.div.style.width = this.width + this.units;
return;
}
this.div.classList.remove('indeterminate');
var progressSize = this.width * this._percent / 100;
this.div.style.width = progressSize + this.units;
},
get percent() {
return this._percent;
},
set percent(val) {
this._indeterminate = isNaN(val);
this._percent = clamp(val, 0, 100);
this.updateBar();
},
setWidth: function ProgressBar_setWidth(viewer) {
if (viewer) {
var container = viewer.parentNode;
var scrollbarWidth = container.offsetWidth - viewer.offsetWidth;
if (scrollbarWidth > 0) {
this.bar.setAttribute('style', 'width: calc(100% - ' +
scrollbarWidth + 'px);');
}
}
},
hide: function ProgressBar_hide() {
if (!this.visible) {
return;
}
this.visible = false;
this.bar.classList.add('hidden');
document.body.classList.remove('loadingInProgress');
},
show: function ProgressBar_show() {
if (this.visible) {
return;
}
this.visible = true;
document.body.classList.add('loadingInProgress');
this.bar.classList.remove('hidden');
}
};
return ProgressBar;
})();
/**
* Performs navigation functions inside PDF, such as opening specified page,
* or destination.
* @class
* @implements {IPDFLinkService}
*/
var PDFLinkService = (function () {
/**
* @constructs PDFLinkService
*/
function PDFLinkService() {
this.baseUrl = null;
this.pdfDocument = null;
this.pdfViewer = null;
this.pdfHistory = null;
this._pagesRefCache = null;
}
PDFLinkService.prototype = {
setDocument: function PDFLinkService_setDocument(pdfDocument, baseUrl) {
this.baseUrl = baseUrl;
this.pdfDocument = pdfDocument;
this._pagesRefCache = Object.create(null);
},
setViewer: function PDFLinkService_setViewer(pdfViewer) {
this.pdfViewer = pdfViewer;
},
setHistory: function PDFLinkService_setHistory(pdfHistory) {
this.pdfHistory = pdfHistory;
},
/**
* @returns {number}
*/
get pagesCount() {
return this.pdfDocument.numPages;
},
/**
* @returns {number}
*/
get page() {
return this.pdfViewer.currentPageNumber;
},
/**
* @param {number} value
*/
set page(value) {
this.pdfViewer.currentPageNumber = value;
},
/**
* @param dest - The PDF destination object.
*/
navigateTo: function PDFLinkService_navigateTo(dest) {
var destString = '';
var self = this;
var goToDestination = function(destRef) {
// dest array looks like that: <page-ref> </XYZ|FitXXX> <args..>
var pageNumber = destRef instanceof Object ?
self._pagesRefCache[destRef.num + ' ' + destRef.gen + ' R'] :
(destRef + 1);
if (pageNumber) {
if (pageNumber > self.pagesCount) {
pageNumber = self.pagesCount;
}
self.pdfViewer.scrollPageIntoView(pageNumber, dest);
if (self.pdfHistory) {
// Update the browsing history.
self.pdfHistory.push({
dest: dest,
hash: destString,
page: pageNumber
});
}
} else {
self.pdfDocument.getPageIndex(destRef).then(function (pageIndex) {
var pageNum = pageIndex + 1;
var cacheKey = destRef.num + ' ' + destRef.gen + ' R';
self._pagesRefCache[cacheKey] = pageNum;
goToDestination(destRef);
});
}
};
var destinationPromise;
if (typeof dest === 'string') {
destString = dest;
destinationPromise = this.pdfDocument.getDestination(dest);
} else {
destinationPromise = Promise.resolve(dest);
}
destinationPromise.then(function(destination) {
dest = destination;
if (!(destination instanceof Array)) {
return; // invalid destination
}
goToDestination(destination[0]);
});
},
/**
* @param dest - The PDF destination object.
* @returns {string} The hyperlink to the PDF object.
*/
getDestinationHash: function PDFLinkService_getDestinationHash(dest) {
if (typeof dest === 'string') {
return this.getAnchorUrl('#' + escape(dest));
}
if (dest instanceof Array) {
var destRef = dest[0]; // see navigateTo method for dest format
var pageNumber = destRef instanceof Object ?
this._pagesRefCache[destRef.num + ' ' + destRef.gen + ' R'] :
(destRef + 1);
if (pageNumber) {
var pdfOpenParams = this.getAnchorUrl('#page=' + pageNumber);
var destKind = dest[1];
if (typeof destKind === 'object' && 'name' in destKind &&
destKind.name === 'XYZ') {
var scale = (dest[4] || this.pdfViewer.currentScaleValue);
var scaleNumber = parseFloat(scale);
if (scaleNumber) {
scale = scaleNumber * 100;
}
pdfOpenParams += '&zoom=' + scale;
if (dest[2] || dest[3]) {
pdfOpenParams += ',' + (dest[2] || 0) + ',' + (dest[3] || 0);
}
}
return pdfOpenParams;
}
}
return this.getAnchorUrl('');
},
/**
* Prefix the full url on anchor links to make sure that links are resolved
* relative to the current URL instead of the one defined in <base href>.
* @param {String} anchor The anchor hash, including the #.
* @returns {string} The hyperlink to the PDF object.
*/
getAnchorUrl: function PDFLinkService_getAnchorUrl(anchor) {
return (this.baseUrl || '') + anchor;
},
/**
* @param {string} hash
*/
setHash: function PDFLinkService_setHash(hash) {
if (hash.indexOf('=') >= 0) {
var params = parseQueryString(hash);
// borrowing syntax from "Parameters for Opening PDF Files"
if ('nameddest' in params) {
if (this.pdfHistory) {
this.pdfHistory.updateNextHashParam(params.nameddest);
}
this.navigateTo(params.nameddest);
return;
}
var pageNumber, dest;
if ('page' in params) {
pageNumber = (params.page | 0) || 1;
}
if ('zoom' in params) {
// Build the destination array.
var zoomArgs = params.zoom.split(','); // scale,left,top
var zoomArg = zoomArgs[0];
var zoomArgNumber = parseFloat(zoomArg);
if (zoomArg.indexOf('Fit') === -1) {
// If the zoomArg is a number, it has to get divided by 100. If it's
// a string, it should stay as it is.
dest = [null, { name: 'XYZ' },
zoomArgs.length > 1 ? (zoomArgs[1] | 0) : null,
zoomArgs.length > 2 ? (zoomArgs[2] | 0) : null,
(zoomArgNumber ? zoomArgNumber / 100 : zoomArg)];
} else {
if (zoomArg === 'Fit' || zoomArg === 'FitB') {
dest = [null, { name: zoomArg }];
} else if ((zoomArg === 'FitH' || zoomArg === 'FitBH') ||
(zoomArg === 'FitV' || zoomArg === 'FitBV')) {
dest = [null, { name: zoomArg },
zoomArgs.length > 1 ? (zoomArgs[1] | 0) : null];
} else if (zoomArg === 'FitR') {
if (zoomArgs.length !== 5) {
console.error('PDFLinkService_setHash: ' +
'Not enough parameters for \'FitR\'.');
} else {
dest = [null, { name: zoomArg },
(zoomArgs[1] | 0), (zoomArgs[2] | 0),
(zoomArgs[3] | 0), (zoomArgs[4] | 0)];
}
} else {
console.error('PDFLinkService_setHash: \'' + zoomArg +
'\' is not a valid zoom value.');
}
}
}
if (dest) {
this.pdfViewer.scrollPageIntoView(pageNumber || this.page, dest);
} else if (pageNumber) {
this.page = pageNumber; // simple page
}
if ('pagemode' in params) {
var event = document.createEvent('CustomEvent');
event.initCustomEvent('pagemode', true, true, {
mode: params.pagemode,
});
this.pdfViewer.container.dispatchEvent(event);
}
} else if (/^\d+$/.test(hash)) { // page number
this.page = hash;
} else { // named destination
if (this.pdfHistory) {
this.pdfHistory.updateNextHashParam(unescape(hash));
}
this.navigateTo(unescape(hash));
}
},
/**
* @param {string} action
*/
executeNamedAction: function PDFLinkService_executeNamedAction(action) {
// See PDF reference, table 8.45 - Named action
switch (action) {
case 'GoBack':
if (this.pdfHistory) {
this.pdfHistory.back();
}
break;
case 'GoForward':
if (this.pdfHistory) {
this.pdfHistory.forward();
}
break;
case 'NextPage':
this.page++;
break;
case 'PrevPage':
this.page--;
break;
case 'LastPage':
this.page = this.pagesCount;
break;
case 'FirstPage':
this.page = 1;
break;
default:
break; // No action according to spec
}
var event = document.createEvent('CustomEvent');
event.initCustomEvent('namedaction', true, true, {
action: action
});
this.pdfViewer.container.dispatchEvent(event);
},
/**
* @param {number} pageNum - page number.
* @param {Object} pageRef - reference to the page.
*/
cachePageRef: function PDFLinkService_cachePageRef(pageNum, pageRef) {
var refStr = pageRef.num + ' ' + pageRef.gen + ' R';
this._pagesRefCache[refStr] = pageNum;
}
};
return PDFLinkService;
})();
var PresentationModeState = {
UNKNOWN: 0,
NORMAL: 1,
CHANGING: 2,
FULLSCREEN: 3,
};
var IGNORE_CURRENT_POSITION_ON_ZOOM = false;
var DEFAULT_CACHE_SIZE = 10;
var CLEANUP_TIMEOUT = 30000;
var RenderingStates = {
INITIAL: 0,
RUNNING: 1,
PAUSED: 2,
FINISHED: 3
};
/**
* Controls rendering of the views for pages and thumbnails.
* @class
*/
var PDFRenderingQueue = (function PDFRenderingQueueClosure() {
/**
* @constructs
*/
function PDFRenderingQueue() {
this.pdfViewer = null;
this.pdfThumbnailViewer = null;
this.onIdle = null;
this.highestPriorityPage = null;
this.idleTimeout = null;
this.printing = false;
this.isThumbnailViewEnabled = false;
}
PDFRenderingQueue.prototype = /** @lends PDFRenderingQueue.prototype */ {
/**
* @param {PDFViewer} pdfViewer
*/
setViewer: function PDFRenderingQueue_setViewer(pdfViewer) {
this.pdfViewer = pdfViewer;
},
/**
* @param {PDFThumbnailViewer} pdfThumbnailViewer
*/
setThumbnailViewer:
function PDFRenderingQueue_setThumbnailViewer(pdfThumbnailViewer) {
this.pdfThumbnailViewer = pdfThumbnailViewer;
},
/**
* @param {IRenderableView} view
* @returns {boolean}
*/
isHighestPriority: function PDFRenderingQueue_isHighestPriority(view) {
return this.highestPriorityPage === view.renderingId;
},
renderHighestPriority: function
PDFRenderingQueue_renderHighestPriority(currentlyVisiblePages) {
if (this.idleTimeout) {
clearTimeout(this.idleTimeout);
this.idleTimeout = null;
}
// Pages have a higher priority than thumbnails, so check them first.
if (this.pdfViewer.forceRendering(currentlyVisiblePages)) {
return;
}
// No pages needed rendering so check thumbnails.
if (this.pdfThumbnailViewer && this.isThumbnailViewEnabled) {
if (this.pdfThumbnailViewer.forceRendering()) {
return;
}
}
if (this.printing) {
// If printing is currently ongoing do not reschedule cleanup.
return;
}
if (this.onIdle) {
this.idleTimeout = setTimeout(this.onIdle.bind(this), CLEANUP_TIMEOUT);
}
},
getHighestPriority: function
PDFRenderingQueue_getHighestPriority(visible, views, scrolledDown) {
// The state has changed figure out which page has the highest priority to
// render next (if any).
// Priority:
// 1 visible pages
// 2 if last scrolled down page after the visible pages
// 2 if last scrolled up page before the visible pages
var visibleViews = visible.views;
var numVisible = visibleViews.length;
if (numVisible === 0) {
return false;
}
for (var i = 0; i < numVisible; ++i) {
var view = visibleViews[i].view;
if (!this.isViewFinished(view)) {
return view;
}
}
// All the visible views have rendered, try to render next/previous pages.
if (scrolledDown) {
var nextPageIndex = visible.last.id;
// ID's start at 1 so no need to add 1.
if (views[nextPageIndex] &&
!this.isViewFinished(views[nextPageIndex])) {
return views[nextPageIndex];
}
} else {
var previousPageIndex = visible.first.id - 2;
if (views[previousPageIndex] &&
!this.isViewFinished(views[previousPageIndex])) {
return views[previousPageIndex];
}
}
// Everything that needs to be rendered has been.
return null;
},
/**
* @param {IRenderableView} view
* @returns {boolean}
*/
isViewFinished: function PDFRenderingQueue_isViewFinished(view) {
return view.renderingState === RenderingStates.FINISHED;
},
/**
* Render a page or thumbnail view. This calls the appropriate function
* based on the views state. If the view is already rendered it will return
* false.
* @param {IRenderableView} view
*/
renderView: function PDFRenderingQueue_renderView(view) {
var state = view.renderingState;
switch (state) {
case RenderingStates.FINISHED:
return false;
case RenderingStates.PAUSED:
this.highestPriorityPage = view.renderingId;
view.resume();
break;
case RenderingStates.RUNNING:
this.highestPriorityPage = view.renderingId;
break;
case RenderingStates.INITIAL:
this.highestPriorityPage = view.renderingId;
var continueRendering = function () {
this.renderHighestPriority();
}.bind(this);
view.draw().then(continueRendering, continueRendering);
break;
}
return true;
},
};
return PDFRenderingQueue;
})();
var TEXT_LAYER_RENDER_DELAY = 200; // ms
/**
* @typedef {Object} PDFPageViewOptions
* @property {HTMLDivElement} container - The viewer element.
* @property {number} id - The page unique ID (normally its number).
* @property {number} scale - The page scale display.
* @property {PageViewport} defaultViewport - The page viewport.
* @property {PDFRenderingQueue} renderingQueue - The rendering queue object.
* @property {IPDFTextLayerFactory} textLayerFactory
* @property {IPDFAnnotationLayerFactory} annotationLayerFactory
*/
/**
* @class
* @implements {IRenderableView}
*/
var PDFPageView = (function PDFPageViewClosure() {
/**
* @constructs PDFPageView
* @param {PDFPageViewOptions} options
*/
function PDFPageView(options) {
var container = options.container;
var id = options.id;
var scale = options.scale;
var defaultViewport = options.defaultViewport;
var renderingQueue = options.renderingQueue;
var textLayerFactory = options.textLayerFactory;
var annotationLayerFactory = options.annotationLayerFactory;
this.id = id;
this.renderingId = 'page' + id;
this.rotation = 0;
this.scale = scale || DEFAULT_SCALE;
this.viewport = defaultViewport;
this.pdfPageRotate = defaultViewport.rotation;
this.hasRestrictedScaling = false;
this.renderingQueue = renderingQueue;
this.textLayerFactory = textLayerFactory;
this.annotationLayerFactory = annotationLayerFactory;
this.renderingState = RenderingStates.INITIAL;
this.resume = null;
this.onBeforeDraw = null;
this.onAfterDraw = null;
this.textLayer = null;
this.zoomLayer = null;
this.annotationLayer = null;
var div = document.createElement('div');
div.id = 'pageContainer' + this.id;
div.className = 'page';
div.style.width = Math.floor(this.viewport.width) + 'px';
div.style.height = Math.floor(this.viewport.height) + 'px';
div.setAttribute('data-page-number', this.id);
this.div = div;
container.appendChild(div);
}
PDFPageView.prototype = {
setPdfPage: function PDFPageView_setPdfPage(pdfPage) {
this.pdfPage = pdfPage;
this.pdfPageRotate = pdfPage.rotate;
var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
this.viewport = pdfPage.getViewport(this.scale * CSS_UNITS,
totalRotation);
this.stats = pdfPage.stats;
this.reset();
},
destroy: function PDFPageView_destroy() {
this.zoomLayer = null;
this.reset();
if (this.pdfPage) {
this.pdfPage.cleanup();
}
},
reset: function PDFPageView_reset(keepZoomLayer, keepAnnotations) {
if (this.renderTask) {
this.renderTask.cancel();
}
this.resume = null;
this.renderingState = RenderingStates.INITIAL;
var div = this.div;
div.style.width = Math.floor(this.viewport.width) + 'px';
div.style.height = Math.floor(this.viewport.height) + 'px';
var childNodes = div.childNodes;
var currentZoomLayerNode = (keepZoomLayer && this.zoomLayer) || null;
var currentAnnotationNode = (keepAnnotations && this.annotationLayer &&
this.annotationLayer.div) || null;
for (var i = childNodes.length - 1; i >= 0; i--) {
var node = childNodes[i];
if (currentZoomLayerNode === node || currentAnnotationNode === node) {
continue;
}
div.removeChild(node);
}
div.removeAttribute('data-loaded');
if (currentAnnotationNode) {
// Hide annotationLayer until all elements are resized
// so they are not displayed on the already-resized page
this.annotationLayer.hide();
} else {
this.annotationLayer = null;
}
if (this.canvas && !currentZoomLayerNode) {
// Zeroing the width and height causes Firefox to release graphics
// resources immediately, which can greatly reduce memory consumption.
this.canvas.width = 0;
this.canvas.height = 0;
delete this.canvas;
}
this.loadingIconDiv = document.createElement('div');
this.loadingIconDiv.className = 'loadingIcon';
div.appendChild(this.loadingIconDiv);
},
update: function PDFPageView_update(scale, rotation) {
this.scale = scale || this.scale;
if (typeof rotation !== 'undefined') {
this.rotation = rotation;
}
var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
this.viewport = this.viewport.clone({
scale: this.scale * CSS_UNITS,
rotation: totalRotation
});
var isScalingRestricted = false;
if (this.canvas && PDFJS.maxCanvasPixels > 0) {
var outputScale = this.outputScale;
var pixelsInViewport = this.viewport.width * this.viewport.height;
var maxScale = Math.sqrt(PDFJS.maxCanvasPixels / pixelsInViewport);
if (((Math.floor(this.viewport.width) * outputScale.sx) | 0) *
((Math.floor(this.viewport.height) * outputScale.sy) | 0) >
PDFJS.maxCanvasPixels) {
isScalingRestricted = true;
}
}
if (this.canvas) {
if (PDFJS.useOnlyCssZoom ||
(this.hasRestrictedScaling && isScalingRestricted)) {
this.cssTransform(this.canvas, true);
var event = document.createEvent('CustomEvent');
event.initCustomEvent('pagerendered', true, true, {
pageNumber: this.id,
cssTransform: true,
});
this.div.dispatchEvent(event);
return;
}
if (!this.zoomLayer) {
this.zoomLayer = this.canvas.parentNode;
this.zoomLayer.style.position = 'absolute';
}
}
if (this.zoomLayer) {
this.cssTransform(this.zoomLayer.firstChild);
}
this.reset(/* keepZoomLayer = */ true, /* keepAnnotations = */ true);
},
/**
* Called when moved in the parent's container.
*/
updatePosition: function PDFPageView_updatePosition() {
if (this.textLayer) {
this.textLayer.render(TEXT_LAYER_RENDER_DELAY);
}
},
cssTransform: function PDFPageView_transform(canvas, redrawAnnotations) {
var CustomStyle = PDFJS.CustomStyle;
// Scale canvas, canvas wrapper, and page container.
var width = this.viewport.width;
var height = this.viewport.height;
var div = this.div;
canvas.style.width = canvas.parentNode.style.width = div.style.width =
Math.floor(width) + 'px';
canvas.style.height = canvas.parentNode.style.height = div.style.height =
Math.floor(height) + 'px';
// The canvas may have been originally rotated, rotate relative to that.
var relativeRotation = this.viewport.rotation - canvas._viewport.rotation;
var absRotation = Math.abs(relativeRotation);
var scaleX = 1, scaleY = 1;
if (absRotation === 90 || absRotation === 270) {
// Scale x and y because of the rotation.
scaleX = height / width;
scaleY = width / height;
}
var cssTransform = 'rotate(' + relativeRotation + 'deg) ' +
'scale(' + scaleX + ',' + scaleY + ')';
CustomStyle.setProp('transform', canvas, cssTransform);
if (this.textLayer) {
// Rotating the text layer is more complicated since the divs inside the
// the text layer are rotated.
// TODO: This could probably be simplified by drawing the text layer in
// one orientation then rotating overall.
var textLayerViewport = this.textLayer.viewport;
var textRelativeRotation = this.viewport.rotation -
textLayerViewport.rotation;
var textAbsRotation = Math.abs(textRelativeRotation);
var scale = width / textLayerViewport.width;
if (textAbsRotation === 90 || textAbsRotation === 270) {
scale = width / textLayerViewport.height;
}
var textLayerDiv = this.textLayer.textLayerDiv;
var transX, transY;
switch (textAbsRotation) {
case 0:
transX = transY = 0;
break;
case 90:
transX = 0;
transY = '-' + textLayerDiv.style.height;
break;
case 180:
transX = '-' + textLayerDiv.style.width;
transY = '-' + textLayerDiv.style.height;
break;
case 270:
transX = '-' + textLayerDiv.style.width;
transY = 0;
break;
default:
console.error('Bad rotation value.');
break;
}
CustomStyle.setProp('transform', textLayerDiv,
'rotate(' + textAbsRotation + 'deg) ' +
'scale(' + scale + ', ' + scale + ') ' +
'translate(' + transX + ', ' + transY + ')');
CustomStyle.setProp('transformOrigin', textLayerDiv, '0% 0%');
}
if (redrawAnnotations && this.annotationLayer) {
this.annotationLayer.render(this.viewport, 'display');
}
},
get width() {
return this.viewport.width;
},
get height() {
return this.viewport.height;
},
getPagePoint: function PDFPageView_getPagePoint(x, y) {
return this.viewport.convertToPdfPoint(x, y);
},
draw: function PDFPageView_draw() {
if (this.renderingState !== RenderingStates.INITIAL) {
console.error('Must be in new state before drawing');
}
this.renderingState = RenderingStates.RUNNING;
var pdfPage = this.pdfPage;
var viewport = this.viewport;
var div = this.div;
// Wrap the canvas so if it has a css transform for highdpi the overflow
// will be hidden in FF.
var canvasWrapper = document.createElement('div');
canvasWrapper.style.width = div.style.width;
canvasWrapper.style.height = div.style.height;
canvasWrapper.classList.add('canvasWrapper');
var canvas = document.createElement('canvas');
canvas.id = 'page' + this.id;
// Keep the canvas hidden until the first draw callback, or until drawing
// is complete when `!this.renderingQueue`, to prevent black flickering.
canvas.setAttribute('hidden', 'hidden');
var isCanvasHidden = true;
canvasWrapper.appendChild(canvas);
if (this.annotationLayer && this.annotationLayer.div) {
// annotationLayer needs to stay on top
div.insertBefore(canvasWrapper, this.annotationLayer.div);
} else {
div.appendChild(canvasWrapper);
}
this.canvas = canvas;
var ctx = canvas.getContext('2d', {alpha: false});
var outputScale = getOutputScale(ctx);
this.outputScale = outputScale;
if (PDFJS.useOnlyCssZoom) {
var actualSizeViewport = viewport.clone({scale: CSS_UNITS});
// Use a scale that will make the canvas be the original intended size
// of the page.
outputScale.sx *= actualSizeViewport.width / viewport.width;
outputScale.sy *= actualSizeViewport.height / viewport.height;
outputScale.scaled = true;
}
if (PDFJS.maxCanvasPixels > 0) {
var pixelsInViewport = viewport.width * viewport.height;
var maxScale = Math.sqrt(PDFJS.maxCanvasPixels / pixelsInViewport);
if (outputScale.sx > maxScale || outputScale.sy > maxScale) {
outputScale.sx = maxScale;
outputScale.sy = maxScale;
outputScale.scaled = true;
this.hasRestrictedScaling = true;
} else {
this.hasRestrictedScaling = false;
}
}
var sfx = approximateFraction(outputScale.sx);
var sfy = approximateFraction(outputScale.sy);
canvas.width = roundToDivide(viewport.width * outputScale.sx, sfx[0]);
canvas.height = roundToDivide(viewport.height * outputScale.sy, sfy[0]);
canvas.style.width = roundToDivide(viewport.width, sfx[1]) + 'px';
canvas.style.height = roundToDivide(viewport.height, sfy[1]) + 'px';
// Add the viewport so it's known what it was originally drawn with.
canvas._viewport = viewport;
var textLayerDiv = null;
var textLayer = null;
if (this.textLayerFactory) {
textLayerDiv = document.createElement('div');
textLayerDiv.className = 'textLayer';
textLayerDiv.style.width = canvasWrapper.style.width;
textLayerDiv.style.height = canvasWrapper.style.height;
if (this.annotationLayer && this.annotationLayer.div) {
// annotationLayer needs to stay on top
div.insertBefore(textLayerDiv, this.annotationLayer.div);
} else {
div.appendChild(textLayerDiv);
}
textLayer = this.textLayerFactory.createTextLayerBuilder(textLayerDiv,
this.id - 1,
this.viewport);
}
this.textLayer = textLayer;
var resolveRenderPromise, rejectRenderPromise;
var promise = new Promise(function (resolve, reject) {
resolveRenderPromise = resolve;
rejectRenderPromise = reject;
});
// Rendering area
var self = this;
function pageViewDrawCallback(error) {
// The renderTask may have been replaced by a new one, so only remove
// the reference to the renderTask if it matches the one that is
// triggering this callback.
if (renderTask === self.renderTask) {
self.renderTask = null;
}
if (error === 'cancelled') {
rejectRenderPromise(error);
return;
}
self.renderingState = RenderingStates.FINISHED;
if (isCanvasHidden) {
self.canvas.removeAttribute('hidden');
isCanvasHidden = false;
}
if (self.loadingIconDiv) {
div.removeChild(self.loadingIconDiv);
delete self.loadingIconDiv;
}
if (self.zoomLayer) {
// Zeroing the width and height causes Firefox to release graphics
// resources immediately, which can greatly reduce memory consumption.
var zoomLayerCanvas = self.zoomLayer.firstChild;
zoomLayerCanvas.width = 0;
zoomLayerCanvas.height = 0;
div.removeChild(self.zoomLayer);
self.zoomLayer = null;
}
self.error = error;
self.stats = pdfPage.stats;
if (self.onAfterDraw) {
self.onAfterDraw();
}
var event = document.createEvent('CustomEvent');
event.initCustomEvent('pagerendered', true, true, {
pageNumber: self.id,
cssTransform: false,
});
div.dispatchEvent(event);
if (!error) {
resolveRenderPromise(undefined);
} else {
rejectRenderPromise(error);
}
}
var renderContinueCallback = null;
if (this.renderingQueue) {
renderContinueCallback = function renderContinueCallback(cont) {
if (!self.renderingQueue.isHighestPriority(self)) {
self.renderingState = RenderingStates.PAUSED;
self.resume = function resumeCallback() {
self.renderingState = RenderingStates.RUNNING;
cont();
};
return;
}
if (isCanvasHidden) {
self.canvas.removeAttribute('hidden');
isCanvasHidden = false;
}
cont();
};
}
var transform = !outputScale.scaled ? null :
[outputScale.sx, 0, 0, outputScale.sy, 0, 0];
var renderContext = {
canvasContext: ctx,
transform: transform,
viewport: this.viewport,
// intent: 'default', // === 'display'
};
var renderTask = this.renderTask = this.pdfPage.render(renderContext);
renderTask.onContinue = renderContinueCallback;
this.renderTask.promise.then(
function pdfPageRenderCallback() {
pageViewDrawCallback(null);
if (textLayer) {
self.pdfPage.getTextContent({ normalizeWhitespace: true }).then(
function textContentResolved(textContent) {
textLayer.setTextContent(textContent);
textLayer.render(TEXT_LAYER_RENDER_DELAY);
}
);
}
},
function pdfPageRenderError(error) {
pageViewDrawCallback(error);
}
);
if (this.annotationLayerFactory) {
if (!this.annotationLayer) {
this.annotationLayer = this.annotationLayerFactory.
createAnnotationLayerBuilder(div, this.pdfPage);
}
this.annotationLayer.render(this.viewport, 'display');
}
div.setAttribute('data-loaded', true);
if (self.onBeforeDraw) {
self.onBeforeDraw();
}
return promise;
},
beforePrint: function PDFPageView_beforePrint() {
var CustomStyle = PDFJS.CustomStyle;
var pdfPage = this.pdfPage;
var viewport = pdfPage.getViewport(1);
// Use the same hack we use for high dpi displays for printing to get
// better output until bug 811002 is fixed in FF.
var PRINT_OUTPUT_SCALE = 2;
var canvas = document.createElement('canvas');
// The logical size of the canvas.
canvas.width = Math.floor(viewport.width) * PRINT_OUTPUT_SCALE;
canvas.height = Math.floor(viewport.height) * PRINT_OUTPUT_SCALE;
// The rendered size of the canvas, relative to the size of canvasWrapper.
canvas.style.width = (PRINT_OUTPUT_SCALE * 100) + '%';
var cssScale = 'scale(' + (1 / PRINT_OUTPUT_SCALE) + ', ' +
(1 / PRINT_OUTPUT_SCALE) + ')';
CustomStyle.setProp('transform' , canvas, cssScale);
CustomStyle.setProp('transformOrigin' , canvas, '0% 0%');
var printContainer = document.getElementById('printContainer');
var canvasWrapper = document.createElement('div');
canvasWrapper.appendChild(canvas);
printContainer.appendChild(canvasWrapper);
canvas.mozPrintCallback = function(obj) {
var ctx = obj.context;
ctx.save();
ctx.fillStyle = 'rgb(255, 255, 255)';
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.restore();
// Used by the mozCurrentTransform polyfill in src/display/canvas.js.
ctx._transformMatrix =
[PRINT_OUTPUT_SCALE, 0, 0, PRINT_OUTPUT_SCALE, 0, 0];
ctx.scale(PRINT_OUTPUT_SCALE, PRINT_OUTPUT_SCALE);
var renderContext = {
canvasContext: ctx,
viewport: viewport,
intent: 'print'
};
pdfPage.render(renderContext).promise.then(function() {
// Tell the printEngine that rendering this canvas/page has finished.
obj.done();
}, function(error) {
console.error(error);
// Tell the printEngine that rendering this canvas/page has failed.
// This will make the print proces stop.
if ('abort' in obj) {
obj.abort();
} else {
obj.done();
}
});
};
},
};
return PDFPageView;
})();
/**
* @typedef {Object} TextLayerBuilderOptions
* @property {HTMLDivElement} textLayerDiv - The text layer container.
* @property {number} pageIndex - The page index.
* @property {PageViewport} viewport - The viewport of the text layer.
* @property {PDFFindController} findController
*/
/**
* TextLayerBuilder provides text-selection functionality for the PDF.
* It does this by creating overlay divs over the PDF text. These divs
* contain text that matches the PDF text they are overlaying. This object
* also provides a way to highlight text that is being searched for.
* @class
*/
var TextLayerBuilder = (function TextLayerBuilderClosure() {
function TextLayerBuilder(options) {
this.textLayerDiv = options.textLayerDiv;
this.renderingDone = false;
this.divContentDone = false;
this.pageIdx = options.pageIndex;
this.pageNumber = this.pageIdx + 1;
this.matches = [];
this.viewport = options.viewport;
this.textDivs = [];
this.findController = options.findController || null;
this.textLayerRenderTask = null;
this._bindMouse();
}
TextLayerBuilder.prototype = {
_finishRendering: function TextLayerBuilder_finishRendering() {
this.renderingDone = true;
var endOfContent = document.createElement('div');
endOfContent.className = 'endOfContent';
this.textLayerDiv.appendChild(endOfContent);
var event = document.createEvent('CustomEvent');
event.initCustomEvent('textlayerrendered', true, true, {
pageNumber: this.pageNumber
});
this.textLayerDiv.dispatchEvent(event);
},
/**
* Renders the text layer.
* @param {number} timeout (optional) if specified, the rendering waits
* for specified amount of ms.
*/
render: function TextLayerBuilder_render(timeout) {
if (!this.divContentDone || this.renderingDone) {
return;
}
if (this.textLayerRenderTask) {
this.textLayerRenderTask.cancel();
this.textLayerRenderTask = null;
}
this.textDivs = [];
var textLayerFrag = document.createDocumentFragment();
this.textLayerRenderTask = PDFJS.renderTextLayer({
textContent: this.textContent,
container: textLayerFrag,
viewport: this.viewport,
textDivs: this.textDivs,
timeout: timeout
});
this.textLayerRenderTask.promise.then(function () {
this.textLayerDiv.appendChild(textLayerFrag);
this._finishRendering();
this.updateMatches();
}.bind(this), function (reason) {
// canceled or failed to render text layer -- skipping errors
});
},
setTextContent: function TextLayerBuilder_setTextContent(textContent) {
if (this.textLayerRenderTask) {
this.textLayerRenderTask.cancel();
this.textLayerRenderTask = null;
}
this.textContent = textContent;
this.divContentDone = true;
},
convertMatches: function TextLayerBuilder_convertMatches(matches) {
var i = 0;
var iIndex = 0;
var bidiTexts = this.textContent.items;
var end = bidiTexts.length - 1;
var queryLen = (this.findController === null ?
0 : this.findController.state.query.length);
var ret = [];
for (var m = 0, len = matches.length; m < len; m++) {
// Calculate the start position.
var matchIdx = matches[m];
// Loop over the divIdxs.
while (i !== end && matchIdx >= (iIndex + bidiTexts[i].str.length)) {
iIndex += bidiTexts[i].str.length;
i++;
}
if (i === bidiTexts.length) {
console.error('Could not find a matching mapping');
}
var match = {
begin: {
divIdx: i,
offset: matchIdx - iIndex
}
};
// Calculate the end position.
matchIdx += queryLen;
// Somewhat the same array as above, but use > instead of >= to get
// the end position right.
while (i !== end && matchIdx > (iIndex + bidiTexts[i].str.length)) {
iIndex += bidiTexts[i].str.length;
i++;
}
match.end = {
divIdx: i,
offset: matchIdx - iIndex
};
ret.push(match);
}
return ret;
},
renderMatches: function TextLayerBuilder_renderMatches(matches) {
// Early exit if there is nothing to render.
if (matches.length === 0) {
return;
}
var bidiTexts = this.textContent.items;
var textDivs = this.textDivs;
var prevEnd = null;
var pageIdx = this.pageIdx;
var isSelectedPage = (this.findController === null ?
false : (pageIdx === this.findController.selected.pageIdx));
var selectedMatchIdx = (this.findController === null ?
-1 : this.findController.selected.matchIdx);
var highlightAll = (this.findController === null ?
false : this.findController.state.highlightAll);
var infinity = {
divIdx: -1,
offset: undefined
};
function beginText(begin, className) {
var divIdx = begin.divIdx;
textDivs[divIdx].textContent = '';
appendTextToDiv(divIdx, 0, begin.offset, className);
}
function appendTextToDiv(divIdx, fromOffset, toOffset, className) {
var div = textDivs[divIdx];
var content = bidiTexts[divIdx].str.substring(fromOffset, toOffset);
var node = document.createTextNode(content);
if (className) {
var span = document.createElement('span');
span.className = className;
span.appendChild(node);
div.appendChild(span);
return;
}
div.appendChild(node);
}
var i0 = selectedMatchIdx, i1 = i0 + 1;
if (highlightAll) {
i0 = 0;
i1 = matches.length;
} else if (!isSelectedPage) {
// Not highlighting all and this isn't the selected page, so do nothing.
return;
}
for (var i = i0; i < i1; i++) {
var match = matches[i];
var begin = match.begin;
var end = match.end;
var isSelected = (isSelectedPage && i === selectedMatchIdx);
var highlightSuffix = (isSelected ? ' selected' : '');
if (this.findController) {
this.findController.updateMatchPosition(pageIdx, i, textDivs,
begin.divIdx, end.divIdx);
}
// Match inside new div.
if (!prevEnd || begin.divIdx !== prevEnd.divIdx) {
// If there was a previous div, then add the text at the end.
if (prevEnd !== null) {
appendTextToDiv(prevEnd.divIdx, prevEnd.offset, infinity.offset);
}
// Clear the divs and set the content until the starting point.
beginText(begin);
} else {
appendTextToDiv(prevEnd.divIdx, prevEnd.offset, begin.offset);
}
if (begin.divIdx === end.divIdx) {
appendTextToDiv(begin.divIdx, begin.offset, end.offset,
'highlight' + highlightSuffix);
} else {
appendTextToDiv(begin.divIdx, begin.offset, infinity.offset,
'highlight begin' + highlightSuffix);
for (var n0 = begin.divIdx + 1, n1 = end.divIdx; n0 < n1; n0++) {
textDivs[n0].className = 'highlight middle' + highlightSuffix;
}
beginText(end, 'highlight end' + highlightSuffix);
}
prevEnd = end;
}
if (prevEnd) {
appendTextToDiv(prevEnd.divIdx, prevEnd.offset, infinity.offset);
}
},
updateMatches: function TextLayerBuilder_updateMatches() {
// Only show matches when all rendering is done.
if (!this.renderingDone) {
return;
}
// Clear all matches.
var matches = this.matches;
var textDivs = this.textDivs;
var bidiTexts = this.textContent.items;
var clearedUntilDivIdx = -1;
// Clear all current matches.
for (var i = 0, len = matches.length; i < len; i++) {
var match = matches[i];
var begin = Math.max(clearedUntilDivIdx, match.begin.divIdx);
for (var n = begin, end = match.end.divIdx; n <= end; n++) {
var div = textDivs[n];
div.textContent = bidiTexts[n].str;
div.className = '';
}
clearedUntilDivIdx = match.end.divIdx + 1;
}
if (this.findController === null || !this.findController.active) {
return;
}
// Convert the matches on the page controller into the match format
// used for the textLayer.
this.matches = this.convertMatches(this.findController === null ?
[] : (this.findController.pageMatches[this.pageIdx] || []));
this.renderMatches(this.matches);
},
/**
* Fixes text selection: adds additional div where mouse was clicked.
* This reduces flickering of the content if mouse slowly dragged down/up.
* @private
*/
_bindMouse: function TextLayerBuilder_bindMouse() {
var div = this.textLayerDiv;
div.addEventListener('mousedown', function (e) {
var end = div.querySelector('.endOfContent');
if (!end) {
return;
}
// On non-Firefox browsers, the selection will feel better if the height
// of the endOfContent div will be adjusted to start at mouse click
// location -- this will avoid flickering when selections moves up.
// However it does not work when selection started on empty space.
var adjustTop = e.target !== div;
if (adjustTop) {
var divBounds = div.getBoundingClientRect();
var r = Math.max(0, (e.pageY - divBounds.top) / divBounds.height);
end.style.top = (r * 100).toFixed(2) + '%';
}
end.classList.add('active');
});
div.addEventListener('mouseup', function (e) {
var end = div.querySelector('.endOfContent');
if (!end) {
return;
}
end.style.top = '';
end.classList.remove('active');
});
},
};
return TextLayerBuilder;
})();
/**
* @constructor
* @implements IPDFTextLayerFactory
*/
function DefaultTextLayerFactory() {}
DefaultTextLayerFactory.prototype = {
/**
* @param {HTMLDivElement} textLayerDiv
* @param {number} pageIndex
* @param {PageViewport} viewport
* @returns {TextLayerBuilder}
*/
createTextLayerBuilder: function (textLayerDiv, pageIndex, viewport) {
return new TextLayerBuilder({
textLayerDiv: textLayerDiv,
pageIndex: pageIndex,
viewport: viewport
});
}
};
/**
* @typedef {Object} AnnotationLayerBuilderOptions
* @property {HTMLDivElement} pageDiv
* @property {PDFPage} pdfPage
* @property {IPDFLinkService} linkService
* @property {DownloadManager} downloadManager
*/
/**
* @class
*/
var AnnotationLayerBuilder = (function AnnotationLayerBuilderClosure() {
/**
* @param {AnnotationLayerBuilderOptions} options
* @constructs AnnotationLayerBuilder
*/
function AnnotationLayerBuilder(options) {
this.pageDiv = options.pageDiv;
this.pdfPage = options.pdfPage;
this.linkService = options.linkService;
this.downloadManager = options.downloadManager;
this.div = null;
}
AnnotationLayerBuilder.prototype =
/** @lends AnnotationLayerBuilder.prototype */ {
/**
* @param {PageViewport} viewport
* @param {string} intent (default value is 'display')
*/
render: function AnnotationLayerBuilder_render(viewport, intent) {
var self = this;
var parameters = {
intent: (intent === undefined ? 'display' : intent),
};
this.pdfPage.getAnnotations(parameters).then(function (annotations) {
viewport = viewport.clone({ dontFlip: true });
parameters = {
viewport: viewport,
div: self.div,
annotations: annotations,
page: self.pdfPage,
linkService: self.linkService,
downloadManager: self.downloadManager
};
if (self.div) {
// If an annotationLayer already exists, refresh its children's
// transformation matrices.
PDFJS.AnnotationLayer.update(parameters);
} else {
// Create an annotation layer div and render the annotations
// if there is at least one annotation.
if (annotations.length === 0) {
return;
}
self.div = document.createElement('div');
self.div.className = 'annotationLayer';
self.pageDiv.appendChild(self.div);
parameters.div = self.div;
PDFJS.AnnotationLayer.render(parameters);
if (typeof mozL10n !== 'undefined') {
mozL10n.translate(self.div);
}
}
});
},
hide: function AnnotationLayerBuilder_hide() {
if (!this.div) {
return;
}
this.div.setAttribute('hidden', 'true');
}
};
return AnnotationLayerBuilder;
})();
/**
* @constructor
* @implements IPDFAnnotationLayerFactory
*/
function DefaultAnnotationLayerFactory() {}
DefaultAnnotationLayerFactory.prototype = {
/**
* @param {HTMLDivElement} pageDiv
* @param {PDFPage} pdfPage
* @returns {AnnotationLayerBuilder}
*/
createAnnotationLayerBuilder: function (pageDiv, pdfPage) {
return new AnnotationLayerBuilder({
pageDiv: pageDiv,
pdfPage: pdfPage,
linkService: new SimpleLinkService(),
});
}
};
/**
* @typedef {Object} PDFViewerOptions
* @property {HTMLDivElement} container - The container for the viewer element.
* @property {HTMLDivElement} viewer - (optional) The viewer element.
* @property {IPDFLinkService} linkService - The navigation/linking service.
* @property {DownloadManager} downloadManager - (optional) The download
* manager component.
* @property {PDFRenderingQueue} renderingQueue - (optional) The rendering
* queue object.
* @property {boolean} removePageBorders - (optional) Removes the border shadow
* around the pages. The default is false.
*/
/**
* Simple viewer control to display PDF content/pages.
* @class
* @implements {IRenderableView}
*/
var PDFViewer = (function pdfViewer() {
function PDFPageViewBuffer(size) {
var data = [];
this.push = function cachePush(view) {
var i = data.indexOf(view);
if (i >= 0) {
data.splice(i, 1);
}
data.push(view);
if (data.length > size) {
data.shift().destroy();
}
};
this.resize = function (newSize) {
size = newSize;
while (data.length > size) {
data.shift().destroy();
}
};
}
function isSameScale(oldScale, newScale) {
if (newScale === oldScale) {
return true;
}
if (Math.abs(newScale - oldScale) < 1e-15) {
// Prevent unnecessary re-rendering of all pages when the scale
// changes only because of limited numerical precision.
return true;
}
return false;
}
/**
* @constructs PDFViewer
* @param {PDFViewerOptions} options
*/
function PDFViewer(options) {
this.container = options.container;
this.viewer = options.viewer || options.container.firstElementChild;
this.linkService = options.linkService || new SimpleLinkService();
this.downloadManager = options.downloadManager || null;
this.removePageBorders = options.removePageBorders || false;
this.defaultRenderingQueue = !options.renderingQueue;
if (this.defaultRenderingQueue) {
// Custom rendering queue is not specified, using default one
this.renderingQueue = new PDFRenderingQueue();
this.renderingQueue.setViewer(this);
} else {
this.renderingQueue = options.renderingQueue;
}
this.scroll = watchScroll(this.container, this._scrollUpdate.bind(this));
this.updateInProgress = false;
this.presentationModeState = PresentationModeState.UNKNOWN;
this._resetView();
if (this.removePageBorders) {
this.viewer.classList.add('removePageBorders');
}
}
PDFViewer.prototype = /** @lends PDFViewer.prototype */{
get pagesCount() {
return this._pages.length;
},
getPageView: function (index) {
return this._pages[index];
},
get currentPageNumber() {
return this._currentPageNumber;
},
set currentPageNumber(val) {
if (!this.pdfDocument) {
this._currentPageNumber = val;
return;
}
var event = document.createEvent('UIEvents');
event.initUIEvent('pagechange', true, true, window, 0);
event.updateInProgress = this.updateInProgress;
if (!(0 < val && val <= this.pagesCount)) {
event.pageNumber = this._currentPageNumber;
event.previousPageNumber = val;
this.container.dispatchEvent(event);
return;
}
event.previousPageNumber = this._currentPageNumber;
this._currentPageNumber = val;
event.pageNumber = val;
this.container.dispatchEvent(event);
// Check if the caller is `PDFViewer_update`, to avoid breaking scrolling.
if (this.updateInProgress) {
return;
}
this.scrollPageIntoView(val);
},
/**
* @returns {number}
*/
get currentScale() {
return this._currentScale !== UNKNOWN_SCALE ? this._currentScale :
DEFAULT_SCALE;
},
/**
* @param {number} val - Scale of the pages in percents.
*/
set currentScale(val) {
if (isNaN(val)) {
throw new Error('Invalid numeric scale');
}
if (!this.pdfDocument) {
this._currentScale = val;
this._currentScaleValue = val !== UNKNOWN_SCALE ? val.toString() : null;
return;
}
this._setScale(val, false);
},
/**
* @returns {string}
*/
get currentScaleValue() {
return this._currentScaleValue;
},
/**
* @param val - The scale of the pages (in percent or predefined value).
*/
set currentScaleValue(val) {
if (!this.pdfDocument) {
this._currentScale = isNaN(val) ? UNKNOWN_SCALE : val;
this._currentScaleValue = val;
return;
}
this._setScale(val, false);
},
/**
* @returns {number}
*/
get pagesRotation() {
return this._pagesRotation;
},
/**
* @param {number} rotation - The rotation of the pages (0, 90, 180, 270).
*/
set pagesRotation(rotation) {
this._pagesRotation = rotation;
for (var i = 0, l = this._pages.length; i < l; i++) {
var pageView = this._pages[i];
pageView.update(pageView.scale, rotation);
}
this._setScale(this._currentScaleValue, true);
if (this.defaultRenderingQueue) {
this.update();
}
},
/**
* @param pdfDocument {PDFDocument}
*/
setDocument: function (pdfDocument) {
if (this.pdfDocument) {
this._resetView();
}
this.pdfDocument = pdfDocument;
if (!pdfDocument) {
return;
}
var pagesCount = pdfDocument.numPages;
var self = this;
var resolvePagesPromise;
var pagesPromise = new Promise(function (resolve) {
resolvePagesPromise = resolve;
});
this.pagesPromise = pagesPromise;
pagesPromise.then(function () {
var event = document.createEvent('CustomEvent');
event.initCustomEvent('pagesloaded', true, true, {
pagesCount: pagesCount
});
self.container.dispatchEvent(event);
});
var isOnePageRenderedResolved = false;
var resolveOnePageRendered = null;
var onePageRendered = new Promise(function (resolve) {
resolveOnePageRendered = resolve;
});
this.onePageRendered = onePageRendered;
var bindOnAfterAndBeforeDraw = function (pageView) {
pageView.onBeforeDraw = function pdfViewLoadOnBeforeDraw() {
// Add the page to the buffer at the start of drawing. That way it can
// be evicted from the buffer and destroyed even if we pause its
// rendering.
self._buffer.push(this);
};
// when page is painted, using the image as thumbnail base
pageView.onAfterDraw = function pdfViewLoadOnAfterDraw() {
if (!isOnePageRenderedResolved) {
isOnePageRenderedResolved = true;
resolveOnePageRendered();
}
};
};
var firstPagePromise = pdfDocument.getPage(1);
this.firstPagePromise = firstPagePromise;
// Fetch a single page so we can get a viewport that will be the default
// viewport for all pages
return firstPagePromise.then(function(pdfPage) {
var scale = this.currentScale;
var viewport = pdfPage.getViewport(scale * CSS_UNITS);
for (var pageNum = 1; pageNum <= pagesCount; ++pageNum) {
var textLayerFactory = null;
if (!PDFJS.disableTextLayer) {
textLayerFactory = this;
}
var pageView = new PDFPageView({
container: this.viewer,
id: pageNum,
scale: scale,
defaultViewport: viewport.clone(),
renderingQueue: this.renderingQueue,
textLayerFactory: textLayerFactory,
annotationLayerFactory: this
});
bindOnAfterAndBeforeDraw(pageView);
this._pages.push(pageView);
}
var linkService = this.linkService;
// Fetch all the pages since the viewport is needed before printing
// starts to create the correct size canvas. Wait until one page is
// rendered so we don't tie up too many resources early on.
onePageRendered.then(function () {
if (!PDFJS.disableAutoFetch) {
var getPagesLeft = pagesCount;
for (var pageNum = 1; pageNum <= pagesCount; ++pageNum) {
pdfDocument.getPage(pageNum).then(function (pageNum, pdfPage) {
var pageView = self._pages[pageNum - 1];
if (!pageView.pdfPage) {
pageView.setPdfPage(pdfPage);
}
linkService.cachePageRef(pageNum, pdfPage.ref);
getPagesLeft--;
if (!getPagesLeft) {
resolvePagesPromise();
}
}.bind(null, pageNum));
}
} else {
// XXX: Printing is semi-broken with auto fetch disabled.
resolvePagesPromise();
}
});
var event = document.createEvent('CustomEvent');
event.initCustomEvent('pagesinit', true, true, null);
self.container.dispatchEvent(event);
if (this.defaultRenderingQueue) {
this.update();
}
if (this.findController) {
this.findController.resolveFirstPage();
}
}.bind(this));
},
_resetView: function () {
this._pages = [];
this._currentPageNumber = 1;
this._currentScale = UNKNOWN_SCALE;
this._currentScaleValue = null;
this._buffer = new PDFPageViewBuffer(DEFAULT_CACHE_SIZE);
this._location = null;
this._pagesRotation = 0;
this._pagesRequests = [];
var container = this.viewer;
while (container.hasChildNodes()) {
container.removeChild(container.lastChild);
}
},
_scrollUpdate: function PDFViewer_scrollUpdate() {
if (this.pagesCount === 0) {
return;
}
this.update();
for (var i = 0, ii = this._pages.length; i < ii; i++) {
this._pages[i].updatePosition();
}
},
_setScaleDispatchEvent: function pdfViewer_setScaleDispatchEvent(
newScale, newValue, preset) {
var event = document.createEvent('UIEvents');
event.initUIEvent('scalechange', true, true, window, 0);
event.scale = newScale;
if (preset) {
event.presetValue = newValue;
}
this.container.dispatchEvent(event);
},
_setScaleUpdatePages: function pdfViewer_setScaleUpdatePages(
newScale, newValue, noScroll, preset) {
this._currentScaleValue = newValue;
if (isSameScale(this._currentScale, newScale)) {
if (preset) {
this._setScaleDispatchEvent(newScale, newValue, true);
}
return;
}
for (var i = 0, ii = this._pages.length; i < ii; i++) {
this._pages[i].update(newScale);
}
this._currentScale = newScale;
if (!noScroll) {
var page = this._currentPageNumber, dest;
if (this._location && !IGNORE_CURRENT_POSITION_ON_ZOOM &&
!(this.isInPresentationMode || this.isChangingPresentationMode)) {
page = this._location.pageNumber;
dest = [null, { name: 'XYZ' }, this._location.left,
this._location.top, null];
}
this.scrollPageIntoView(page, dest);
}
this._setScaleDispatchEvent(newScale, newValue, preset);
if (this.defaultRenderingQueue) {
this.update();
}
},
_setScale: function pdfViewer_setScale(value, noScroll) {
var scale = parseFloat(value);
if (scale > 0) {
this._setScaleUpdatePages(scale, value, noScroll, false);
} else {
var currentPage = this._pages[this._currentPageNumber - 1];
if (!currentPage) {
return;
}
var hPadding = (this.isInPresentationMode || this.removePageBorders) ?
0 : SCROLLBAR_PADDING;
var vPadding = (this.isInPresentationMode || this.removePageBorders) ?
0 : VERTICAL_PADDING;
var pageWidthScale = (this.container.clientWidth - hPadding) /
currentPage.width * currentPage.scale;
var pageHeightScale = (this.container.clientHeight - vPadding) /
currentPage.height * currentPage.scale;
switch (value) {
case 'page-actual':
scale = 1;
break;
case 'page-width':
scale = pageWidthScale;
break;
case 'page-height':
scale = pageHeightScale;
break;
case 'page-fit':
scale = Math.min(pageWidthScale, pageHeightScale);
break;
case 'auto':
var isLandscape = (currentPage.width > currentPage.height);
// For pages in landscape mode, fit the page height to the viewer
// *unless* the page would thus become too wide to fit horizontally.
var horizontalScale = isLandscape ?
Math.min(pageHeightScale, pageWidthScale) : pageWidthScale;
scale = Math.min(MAX_AUTO_SCALE, horizontalScale);
break;
default:
console.error('pdfViewSetScale: \'' + value +
'\' is an unknown zoom value.');
return;
}
this._setScaleUpdatePages(scale, value, noScroll, true);
}
},
/**
* Scrolls page into view.
* @param {number} pageNumber
* @param {Array} dest - (optional) original PDF destination array:
* <page-ref> </XYZ|FitXXX> <args..>
*/
scrollPageIntoView: function PDFViewer_scrollPageIntoView(pageNumber,
dest) {
if (!this.pdfDocument) {
return;
}
var pageView = this._pages[pageNumber - 1];
if (this.isInPresentationMode) {
if (this._currentPageNumber !== pageView.id) {
// Avoid breaking getVisiblePages in presentation mode.
this.currentPageNumber = pageView.id;
return;
}
dest = null;
// Fixes the case when PDF has different page sizes.
this._setScale(this._currentScaleValue, true);
}
if (!dest) {
scrollIntoView(pageView.div);
return;
}
var x = 0, y = 0;
var width = 0, height = 0, widthScale, heightScale;
var changeOrientation = (pageView.rotation % 180 === 0 ? false : true);
var pageWidth = (changeOrientation ? pageView.height : pageView.width) /
pageView.scale / CSS_UNITS;
var pageHeight = (changeOrientation ? pageView.width : pageView.height) /
pageView.scale / CSS_UNITS;
var scale = 0;
switch (dest[1].name) {
case 'XYZ':
x = dest[2];
y = dest[3];
scale = dest[4];
// If x and/or y coordinates are not supplied, default to
// _top_ left of the page (not the obvious bottom left,
// since aligning the bottom of the intended page with the
// top of the window is rarely helpful).
x = x !== null ? x : 0;
y = y !== null ? y : pageHeight;
break;
case 'Fit':
case 'FitB':
scale = 'page-fit';
break;
case 'FitH':
case 'FitBH':
y = dest[2];
scale = 'page-width';
// According to the PDF spec, section 12.3.2.2, a `null` value in the
// parameter should maintain the position relative to the new page.
if (y === null && this._location) {
x = this._location.left;
y = this._location.top;
}
break;
case 'FitV':
case 'FitBV':
x = dest[2];
width = pageWidth;
height = pageHeight;
scale = 'page-height';
break;
case 'FitR':
x = dest[2];
y = dest[3];
width = dest[4] - x;
height = dest[5] - y;
var hPadding = this.removePageBorders ? 0 : SCROLLBAR_PADDING;
var vPadding = this.removePageBorders ? 0 : VERTICAL_PADDING;
widthScale = (this.container.clientWidth - hPadding) /
width / CSS_UNITS;
heightScale = (this.container.clientHeight - vPadding) /
height / CSS_UNITS;
scale = Math.min(Math.abs(widthScale), Math.abs(heightScale));
break;
default:
return;
}
if (scale && scale !== this._currentScale) {
this.currentScaleValue = scale;
} else if (this._currentScale === UNKNOWN_SCALE) {
this.currentScaleValue = DEFAULT_SCALE_VALUE;
}
if (scale === 'page-fit' && !dest[4]) {
scrollIntoView(pageView.div);
return;
}
var boundingRect = [
pageView.viewport.convertToViewportPoint(x, y),
pageView.viewport.convertToViewportPoint(x + width, y + height)
];
var left = Math.min(boundingRect[0][0], boundingRect[1][0]);
var top = Math.min(boundingRect[0][1], boundingRect[1][1]);
scrollIntoView(pageView.div, { left: left, top: top });
},
_updateLocation: function (firstPage) {
var currentScale = this._currentScale;
var currentScaleValue = this._currentScaleValue;
var normalizedScaleValue =
parseFloat(currentScaleValue) === currentScale ?
Math.round(currentScale * 10000) / 100 : currentScaleValue;
var pageNumber = firstPage.id;
var pdfOpenParams = '#page=' + pageNumber;
pdfOpenParams += '&zoom=' + normalizedScaleValue;
var currentPageView = this._pages[pageNumber - 1];
var container = this.container;
var topLeft = currentPageView.getPagePoint(
(container.scrollLeft - firstPage.x),
(container.scrollTop - firstPage.y));
var intLeft = Math.round(topLeft[0]);
var intTop = Math.round(topLeft[1]);
pdfOpenParams += ',' + intLeft + ',' + intTop;
this._location = {
pageNumber: pageNumber,
scale: normalizedScaleValue,
top: intTop,
left: intLeft,
pdfOpenParams: pdfOpenParams
};
},
update: function PDFViewer_update() {
var visible = this._getVisiblePages();
var visiblePages = visible.views;
if (visiblePages.length === 0) {
return;
}
this.updateInProgress = true;
var suggestedCacheSize = Math.max(DEFAULT_CACHE_SIZE,
2 * visiblePages.length + 1);
this._buffer.resize(suggestedCacheSize);
this.renderingQueue.renderHighestPriority(visible);
var currentId = this._currentPageNumber;
var firstPage = visible.first;
for (var i = 0, ii = visiblePages.length, stillFullyVisible = false;
i < ii; ++i) {
var page = visiblePages[i];
if (page.percent < 100) {
break;
}
if (page.id === currentId) {
stillFullyVisible = true;
break;
}
}
if (!stillFullyVisible) {
currentId = visiblePages[0].id;
}
if (!this.isInPresentationMode) {
this.currentPageNumber = currentId;
}
this._updateLocation(firstPage);
this.updateInProgress = false;
var event = document.createEvent('UIEvents');
event.initUIEvent('updateviewarea', true, true, window, 0);
event.location = this._location;
this.container.dispatchEvent(event);
},
containsElement: function (element) {
return this.container.contains(element);
},
focus: function () {
this.container.focus();
},
get isInPresentationMode() {
return this.presentationModeState === PresentationModeState.FULLSCREEN;
},
get isChangingPresentationMode() {
return this.presentationModeState === PresentationModeState.CHANGING;
},
get isHorizontalScrollbarEnabled() {
return (this.isInPresentationMode ?
false : (this.container.scrollWidth > this.container.clientWidth));
},
_getVisiblePages: function () {
if (!this.isInPresentationMode) {
return getVisibleElements(this.container, this._pages, true);
} else {
// The algorithm in getVisibleElements doesn't work in all browsers and
// configurations when presentation mode is active.
var visible = [];
var currentPage = this._pages[this._currentPageNumber - 1];
visible.push({ id: currentPage.id, view: currentPage });
return { first: currentPage, last: currentPage, views: visible };
}
},
cleanup: function () {
for (var i = 0, ii = this._pages.length; i < ii; i++) {
if (this._pages[i] &&
this._pages[i].renderingState !== RenderingStates.FINISHED) {
this._pages[i].reset();
}
}
},
/**
* @param {PDFPageView} pageView
* @returns {PDFPage}
* @private
*/
_ensurePdfPageLoaded: function (pageView) {
if (pageView.pdfPage) {
return Promise.resolve(pageView.pdfPage);
}
var pageNumber = pageView.id;
if (this._pagesRequests[pageNumber]) {
return this._pagesRequests[pageNumber];
}
var promise = this.pdfDocument.getPage(pageNumber).then(
function (pdfPage) {
pageView.setPdfPage(pdfPage);
this._pagesRequests[pageNumber] = null;
return pdfPage;
}.bind(this));
this._pagesRequests[pageNumber] = promise;
return promise;
},
forceRendering: function (currentlyVisiblePages) {
var visiblePages = currentlyVisiblePages || this._getVisiblePages();
var pageView = this.renderingQueue.getHighestPriority(visiblePages,
this._pages,
this.scroll.down);
if (pageView) {
this._ensurePdfPageLoaded(pageView).then(function () {
this.renderingQueue.renderView(pageView);
}.bind(this));
return true;
}
return false;
},
getPageTextContent: function (pageIndex) {
return this.pdfDocument.getPage(pageIndex + 1).then(function (page) {
return page.getTextContent({ normalizeWhitespace: true });
});
},
/**
* @param {HTMLDivElement} textLayerDiv
* @param {number} pageIndex
* @param {PageViewport} viewport
* @returns {TextLayerBuilder}
*/
createTextLayerBuilder: function (textLayerDiv, pageIndex, viewport) {
return new TextLayerBuilder({
textLayerDiv: textLayerDiv,
pageIndex: pageIndex,
viewport: viewport,
findController: this.isInPresentationMode ? null : this.findController
});
},
/**
* @param {HTMLDivElement} pageDiv
* @param {PDFPage} pdfPage
* @returns {AnnotationLayerBuilder}
*/
createAnnotationLayerBuilder: function (pageDiv, pdfPage) {
return new AnnotationLayerBuilder({
pageDiv: pageDiv,
pdfPage: pdfPage,
linkService: this.linkService,
downloadManager: this.downloadManager
});
},
setFindController: function (findController) {
this.findController = findController;
},
};
return PDFViewer;
})();
var SimpleLinkService = (function SimpleLinkServiceClosure() {
function SimpleLinkService() {}
SimpleLinkService.prototype = {
/**
* @returns {number}
*/
get page() {
return 0;
},
/**
* @param {number} value
*/
set page(value) {},
/**
* @param dest - The PDF destination object.
*/
navigateTo: function (dest) {},
/**
* @param dest - The PDF destination object.
* @returns {string} The hyperlink to the PDF object.
*/
getDestinationHash: function (dest) {
return '#';
},
/**
* @param hash - The PDF parameters/hash.
* @returns {string} The hyperlink to the PDF object.
*/
getAnchorUrl: function (hash) {
return '#';
},
/**
* @param {string} hash
*/
setHash: function (hash) {},
/**
* @param {string} action
*/
executeNamedAction: function (action) {},
/**
* @param {number} pageNum - page number.
* @param {Object} pageRef - reference to the page.
*/
cachePageRef: function (pageNum, pageRef) {}
};
return SimpleLinkService;
})();
var PDFHistory = (function () {
function PDFHistory(options) {
this.linkService = options.linkService;
this.initialized = false;
this.initialDestination = null;
this.initialBookmark = null;
}
PDFHistory.prototype = {
/**
* @param {string} fingerprint
* @param {IPDFLinkService} linkService
*/
initialize: function pdfHistoryInitialize(fingerprint) {
this.initialized = true;
this.reInitialized = false;
this.allowHashChange = true;
this.historyUnlocked = true;
this.isViewerInPresentationMode = false;
this.previousHash = window.location.hash.substring(1);
this.currentBookmark = '';
this.currentPage = 0;
this.updatePreviousBookmark = false;
this.previousBookmark = '';
this.previousPage = 0;
this.nextHashParam = '';
this.fingerprint = fingerprint;
this.currentUid = this.uid = 0;
this.current = {};
var state = window.history.state;
if (this._isStateObjectDefined(state)) {
// This corresponds to navigating back to the document
// from another page in the browser history.
if (state.target.dest) {
this.initialDestination = state.target.dest;
} else {
this.initialBookmark = state.target.hash;
}
this.currentUid = state.uid;
this.uid = state.uid + 1;
this.current = state.target;
} else {
// This corresponds to the loading of a new document.
if (state && state.fingerprint &&
this.fingerprint !== state.fingerprint) {
// Reinitialize the browsing history when a new document
// is opened in the web viewer.
this.reInitialized = true;
}
this._pushOrReplaceState({fingerprint: this.fingerprint}, true);
}
var self = this;
window.addEventListener('popstate', function pdfHistoryPopstate(evt) {
if (!self.historyUnlocked) {
return;
}
if (evt.state) {
// Move back/forward in the history.
self._goTo(evt.state);
return;
}
// If the state is not set, then the user tried to navigate to a
// different hash by manually editing the URL and pressing Enter, or by
// clicking on an in-page link (e.g. the "current view" link).
// Save the current view state to the browser history.
// Note: In Firefox, history.null could also be null after an in-page
// navigation to the same URL, and without dispatching the popstate
// event: https://bugzilla.mozilla.org/show_bug.cgi?id=1183881
if (self.uid === 0) {
// Replace the previous state if it was not explicitly set.
var previousParams = (self.previousHash && self.currentBookmark &&
self.previousHash !== self.currentBookmark) ?
{hash: self.currentBookmark, page: self.currentPage} :
{page: 1};
replacePreviousHistoryState(previousParams, function() {
updateHistoryWithCurrentHash();
});
} else {
updateHistoryWithCurrentHash();
}
}, false);
function updateHistoryWithCurrentHash() {
self.previousHash = window.location.hash.slice(1);
self._pushToHistory({hash: self.previousHash}, false, true);
self._updatePreviousBookmark();
}
function replacePreviousHistoryState(params, callback) {
// To modify the previous history entry, the following happens:
// 1. history.back()
// 2. _pushToHistory, which calls history.replaceState( ... )
// 3. history.forward()
// Because a navigation via the history API does not immediately update
// the history state, the popstate event is used for synchronization.
self.historyUnlocked = false;
// Suppress the hashchange event to avoid side effects caused by
// navigating back and forward.
self.allowHashChange = false;
window.addEventListener('popstate', rewriteHistoryAfterBack);
history.back();
function rewriteHistoryAfterBack() {
window.removeEventListener('popstate', rewriteHistoryAfterBack);
window.addEventListener('popstate', rewriteHistoryAfterForward);
self._pushToHistory(params, false, true);
history.forward();
}
function rewriteHistoryAfterForward() {
window.removeEventListener('popstate', rewriteHistoryAfterForward);
self.allowHashChange = true;
self.historyUnlocked = true;
callback();
}
}
function pdfHistoryBeforeUnload() {
var previousParams = self._getPreviousParams(null, true);
if (previousParams) {
var replacePrevious = (!self.current.dest &&
self.current.hash !== self.previousHash);
self._pushToHistory(previousParams, false, replacePrevious);
self._updatePreviousBookmark();
}
// Remove the event listener when navigating away from the document,
// since 'beforeunload' prevents Firefox from caching the document.
window.removeEventListener('beforeunload', pdfHistoryBeforeUnload,
false);
}
window.addEventListener('beforeunload', pdfHistoryBeforeUnload, false);
window.addEventListener('pageshow', function pdfHistoryPageShow(evt) {
// If the entire viewer (including the PDF file) is cached in
// the browser, we need to reattach the 'beforeunload' event listener
// since the 'DOMContentLoaded' event is not fired on 'pageshow'.
window.addEventListener('beforeunload', pdfHistoryBeforeUnload, false);
}, false);
window.addEventListener('presentationmodechanged', function(e) {
self.isViewerInPresentationMode = !!e.detail.active;
});
},
clearHistoryState: function pdfHistory_clearHistoryState() {
this._pushOrReplaceState(null, true);
},
_isStateObjectDefined: function pdfHistory_isStateObjectDefined(state) {
return (state && state.uid >= 0 &&
state.fingerprint && this.fingerprint === state.fingerprint &&
state.target && state.target.hash) ? true : false;
},
_pushOrReplaceState: function pdfHistory_pushOrReplaceState(stateObj,
replace) {
if (replace) {
window.history.replaceState(stateObj, '');
} else {
window.history.pushState(stateObj, '');
}
},
get isHashChangeUnlocked() {
if (!this.initialized) {
return true;
}
return this.allowHashChange;
},
_updatePreviousBookmark: function pdfHistory_updatePreviousBookmark() {
if (this.updatePreviousBookmark &&
this.currentBookmark && this.currentPage) {
this.previousBookmark = this.currentBookmark;
this.previousPage = this.currentPage;
this.updatePreviousBookmark = false;
}
},
updateCurrentBookmark: function pdfHistoryUpdateCurrentBookmark(bookmark,
pageNum) {
if (this.initialized) {
this.currentBookmark = bookmark.substring(1);
this.currentPage = pageNum | 0;
this._updatePreviousBookmark();
}
},
updateNextHashParam: function pdfHistoryUpdateNextHashParam(param) {
if (this.initialized) {
this.nextHashParam = param;
}
},
push: function pdfHistoryPush(params, isInitialBookmark) {
if (!(this.initialized && this.historyUnlocked)) {
return;
}
if (params.dest && !params.hash) {
params.hash = (this.current.hash && this.current.dest &&
this.current.dest === params.dest) ?
this.current.hash :
this.linkService.getDestinationHash(params.dest).split('#')[1];
}
if (params.page) {
params.page |= 0;
}
if (isInitialBookmark) {
var target = window.history.state.target;
if (!target) {
// Invoked when the user specifies an initial bookmark,
// thus setting initialBookmark, when the document is loaded.
this._pushToHistory(params, false);
this.previousHash = window.location.hash.substring(1);
}
this.updatePreviousBookmark = this.nextHashParam ? false : true;
if (target) {
// If the current document is reloaded,
// avoid creating duplicate entries in the history.
this._updatePreviousBookmark();
}
return;
}
if (this.nextHashParam) {
if (this.nextHashParam === params.hash) {
this.nextHashParam = null;
this.updatePreviousBookmark = true;
return;
} else {
this.nextHashParam = null;
}
}
if (params.hash) {
if (this.current.hash) {
if (this.current.hash !== params.hash) {
this._pushToHistory(params, true);
} else {
if (!this.current.page && params.page) {
this._pushToHistory(params, false, true);
}
this.updatePreviousBookmark = true;
}
} else {
this._pushToHistory(params, true);
}
} else if (this.current.page && params.page &&
this.current.page !== params.page) {
this._pushToHistory(params, true);
}
},
_getPreviousParams: function pdfHistory_getPreviousParams(onlyCheckPage,
beforeUnload) {
if (!(this.currentBookmark && this.currentPage)) {
return null;
} else if (this.updatePreviousBookmark) {
this.updatePreviousBookmark = false;
}
if (this.uid > 0 && !(this.previousBookmark && this.previousPage)) {
// Prevent the history from getting stuck in the current state,
// effectively preventing the user from going back/forward in
// the history.
//
// This happens if the current position in the document didn't change
// when the history was previously updated. The reasons for this are
// either:
// 1. The current zoom value is such that the document does not need to,
// or cannot, be scrolled to display the destination.
// 2. The previous destination is broken, and doesn't actally point to a
// position within the document.
// (This is either due to a bad PDF generator, or the user making a
// mistake when entering a destination in the hash parameters.)
return null;
}
if ((!this.current.dest && !onlyCheckPage) || beforeUnload) {
if (this.previousBookmark === this.currentBookmark) {
return null;
}
} else if (this.current.page || onlyCheckPage) {
if (this.previousPage === this.currentPage) {
return null;
}
} else {
return null;
}
var params = {hash: this.currentBookmark, page: this.currentPage};
if (this.isViewerInPresentationMode) {
params.hash = null;
}
return params;
},
_stateObj: function pdfHistory_stateObj(params) {
return {fingerprint: this.fingerprint, uid: this.uid, target: params};
},
_pushToHistory: function pdfHistory_pushToHistory(params,
addPrevious, overwrite) {
if (!this.initialized) {
return;
}
if (!params.hash && params.page) {
params.hash = ('page=' + params.page);
}
if (addPrevious && !overwrite) {
var previousParams = this._getPreviousParams();
if (previousParams) {
var replacePrevious = (!this.current.dest &&
this.current.hash !== this.previousHash);
this._pushToHistory(previousParams, false, replacePrevious);
}
}
this._pushOrReplaceState(this._stateObj(params),
(overwrite || this.uid === 0));
this.currentUid = this.uid++;
this.current = params;
this.updatePreviousBookmark = true;
},
_goTo: function pdfHistory_goTo(state) {
if (!(this.initialized && this.historyUnlocked &&
this._isStateObjectDefined(state))) {
return;
}
if (!this.reInitialized && state.uid < this.currentUid) {
var previousParams = this._getPreviousParams(true);
if (previousParams) {
this._pushToHistory(this.current, false);
this._pushToHistory(previousParams, false);
this.currentUid = state.uid;
window.history.back();
return;
}
}
this.historyUnlocked = false;
if (state.target.dest) {
this.linkService.navigateTo(state.target.dest);
} else {
this.linkService.setHash(state.target.hash);
}
this.currentUid = state.uid;
if (state.uid > this.uid) {
this.uid = state.uid;
}
this.current = state.target;
this.updatePreviousBookmark = true;
var currentHash = window.location.hash.substring(1);
if (this.previousHash !== currentHash) {
this.allowHashChange = false;
}
this.previousHash = currentHash;
this.historyUnlocked = true;
},
back: function pdfHistoryBack() {
this.go(-1);
},
forward: function pdfHistoryForward() {
this.go(1);
},
go: function pdfHistoryGo(direction) {
if (this.initialized && this.historyUnlocked) {
var state = window.history.state;
if (direction === -1 && state && state.uid > 0) {
window.history.back();
} else if (direction === 1 && state && state.uid < (this.uid - 1)) {
window.history.forward();
}
}
}
};
return PDFHistory;
})();
var DownloadManager = (function DownloadManagerClosure() {
function download(blobUrl, filename) {
var a = document.createElement('a');
if (a.click) {
// Use a.click() if available. Otherwise, Chrome might show
// "Unsafe JavaScript attempt to initiate a navigation change
// for frame with URL" and not open the PDF at all.
// Supported by (not mentioned = untested):
// - Firefox 6 - 19 (4- does not support a.click, 5 ignores a.click)
// - Chrome 19 - 26 (18- does not support a.click)
// - Opera 9 - 12.15
// - Internet Explorer 6 - 10
// - Safari 6 (5.1- does not support a.click)
a.href = blobUrl;
a.target = '_parent';
// Use a.download if available. This increases the likelihood that
// the file is downloaded instead of opened by another PDF plugin.
if ('download' in a) {
a.download = filename;
}
// <a> must be in the document for IE and recent Firefox versions.
// (otherwise .click() is ignored)
(document.body || document.documentElement).appendChild(a);
a.click();
a.parentNode.removeChild(a);
} else {
if (window.top === window &&
blobUrl.split('#')[0] === window.location.href.split('#')[0]) {
// If _parent == self, then opening an identical URL with different
// location hash will only cause a navigation, not a download.
var padCharacter = blobUrl.indexOf('?') === -1 ? '?' : '&';
blobUrl = blobUrl.replace(/#|$/, padCharacter + '$&');
}
window.open(blobUrl, '_parent');
}
}
function DownloadManager() {}
DownloadManager.prototype = {
downloadUrl: function DownloadManager_downloadUrl(url, filename) {
if (!PDFJS.isValidUrl(url, true)) {
return; // restricted/invalid URL
}
download(url + '#pdfjs.action=download', filename);
},
downloadData: function DownloadManager_downloadData(data, filename,
contentType) {
if (navigator.msSaveBlob) { // IE10 and above
return navigator.msSaveBlob(new Blob([data], { type: contentType }),
filename);
}
var blobUrl = PDFJS.createObjectURL(data, contentType);
download(blobUrl, filename);
},
download: function DownloadManager_download(blob, url, filename) {
if (!URL) {
// URL.createObjectURL is not supported
this.downloadUrl(url, filename);
return;
}
if (navigator.msSaveBlob) {
// IE10 / IE11
if (!navigator.msSaveBlob(blob, filename)) {
this.downloadUrl(url, filename);
}
return;
}
var blobUrl = URL.createObjectURL(blob);
download(blobUrl, filename);
}
};
return DownloadManager;
})();
PDFJS.PDFViewer = PDFViewer;
PDFJS.PDFPageView = PDFPageView;
PDFJS.PDFLinkService = PDFLinkService;
PDFJS.TextLayerBuilder = TextLayerBuilder;
PDFJS.DefaultTextLayerFactory = DefaultTextLayerFactory;
PDFJS.AnnotationLayerBuilder = AnnotationLayerBuilder;
PDFJS.DefaultAnnotationLayerFactory = DefaultAnnotationLayerFactory;
PDFJS.PDFHistory = PDFHistory;
PDFJS.DownloadManager = DownloadManager;
PDFJS.ProgressBar = ProgressBar;
}).call((typeof window === 'undefined') ? this : window);