d46715210a
This should hopefully be sufficient to address issue 6847, and given the limited impact of the code changes I'm not completely sure if this would need to be controlled by a preference!? Initially my intention was to try and provide some (slightly more detailed) implementation suggestions in the issue, but having looked briefly at doing that it would essentially have amounted to actually writing the code anyway. (Especially considering that the recent questions seemed to more-or-less ignore the information already provided in the first post.) Finally, note that since `performance.navigation.type` is marked as deprecated, a slightly different approach was choosen instead.
629 lines
21 KiB
JavaScript
629 lines
21 KiB
JavaScript
/* Copyright 2017 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import {
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getGlobalEventBus, isValidRotation, parseQueryString, waitOnEventOrTimeout
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} from './ui_utils';
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// Heuristic value used when force-resetting `this._blockHashChange`.
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const HASH_CHANGE_TIMEOUT = 1000; // milliseconds
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// Heuristic value used when adding the current position to the browser history.
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const POSITION_UPDATED_THRESHOLD = 50;
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// Heuristic value used when adding a temporary position to the browser history.
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const UPDATE_VIEWAREA_TIMEOUT = 1000; // milliseconds
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/**
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* @typedef {Object} PDFHistoryOptions
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* @property {IPDFLinkService} linkService - The navigation/linking service.
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* @property {EventBus} eventBus - The application event bus.
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*/
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/**
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* @typedef {Object} PushParameters
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* @property {string} namedDest - (optional) The named destination. If absent,
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* a stringified version of `explicitDest` is used.
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* @property {Array} explicitDest - The explicit destination array.
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* @property {number} pageNumber - The page to which the destination points.
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*/
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function getCurrentHash() {
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return document.location.hash;
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}
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function parseCurrentHash(linkService) {
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let hash = unescape(getCurrentHash()).substring(1);
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let params = parseQueryString(hash);
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let page = params.page | 0;
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if (!(Number.isInteger(page) && page > 0 && page <= linkService.pagesCount)) {
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page = null;
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}
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return { hash, page, rotation: linkService.rotation, };
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}
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class PDFHistory {
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/**
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* @param {PDFHistoryOptions} options
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*/
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constructor({ linkService, eventBus, }) {
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this.linkService = linkService;
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this.eventBus = eventBus || getGlobalEventBus();
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this.initialized = false;
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this.initialBookmark = null;
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this.initialRotation = null;
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this._boundEvents = Object.create(null);
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this._isViewerInPresentationMode = false;
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this._isPagesLoaded = false;
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// Ensure that we don't miss either a 'presentationmodechanged' or a
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// 'pagesloaded' event, by registering the listeners immediately.
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this.eventBus.on('presentationmodechanged', (evt) => {
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this._isViewerInPresentationMode = evt.active || evt.switchInProgress;
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});
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this.eventBus.on('pagesloaded', (evt) => {
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this._isPagesLoaded = !!evt.pagesCount;
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});
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}
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/**
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* Initialize the history for the PDF document, using either the current
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* browser history entry or the document hash, whichever is present.
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* @param {string} fingerprint - The PDF document's unique fingerprint.
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* @param {boolean} resetHistory - (optional) Reset the browsing history.
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*/
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initialize(fingerprint, resetHistory = false) {
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if (!fingerprint || typeof fingerprint !== 'string') {
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console.error(
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'PDFHistory.initialize: The "fingerprint" must be a non-empty string.');
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return;
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}
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let reInitialized = this.initialized && this.fingerprint !== fingerprint;
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this.fingerprint = fingerprint;
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if (!this.initialized) {
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this._bindEvents();
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}
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let state = window.history.state;
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this.initialized = true;
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this.initialBookmark = null;
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this.initialRotation = null;
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this._popStateInProgress = false;
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this._blockHashChange = 0;
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this._currentHash = getCurrentHash();
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this._numPositionUpdates = 0;
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this._uid = this._maxUid = 0;
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this._destination = null;
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this._position = null;
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if (!this._isValidState(state, /* checkReload = */ true) || resetHistory) {
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let { hash, page, rotation, } = parseCurrentHash(this.linkService);
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if (!hash || reInitialized || resetHistory) {
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// Ensure that the browser history is reset on PDF document load.
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this._pushOrReplaceState(null, /* forceReplace = */ true);
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return;
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}
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// Ensure that the browser history is initialized correctly when
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// the document hash is present on PDF document load.
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this._pushOrReplaceState({ hash, page, rotation, },
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/* forceReplace = */ true);
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return;
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}
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// The browser history contains a valid entry, ensure that the history is
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// initialized correctly on PDF document load.
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let destination = state.destination;
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this._updateInternalState(destination, state.uid,
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/* removeTemporary = */ true);
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if (this._uid > this._maxUid) {
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this._maxUid = this._uid;
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}
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if (destination.rotation !== undefined) {
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this.initialRotation = destination.rotation;
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}
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if (destination.dest) {
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this.initialBookmark = JSON.stringify(destination.dest);
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// If the history is updated, e.g. through the user changing the hash,
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// before the initial destination has become visible, then we do *not*
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// want to potentially add `this._position` to the browser history.
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this._destination.page = null;
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} else if (destination.hash) {
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this.initialBookmark = destination.hash;
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} else if (destination.page) {
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// Fallback case; shouldn't be necessary, but better safe than sorry.
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this.initialBookmark = `page=${destination.page}`;
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}
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}
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/**
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* Push an internal destination to the browser history.
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* @param {PushParameters}
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*/
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push({ namedDest = null, explicitDest, pageNumber, }) {
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if (!this.initialized) {
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return;
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}
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if (namedDest && typeof namedDest !== 'string') {
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console.error('PDFHistory.push: ' +
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`"${namedDest}" is not a valid namedDest parameter.`);
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return;
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} else if (!Array.isArray(explicitDest)) {
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console.error('PDFHistory.push: ' +
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`"${explicitDest}" is not a valid explicitDest parameter.`);
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return;
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} else if (!(Number.isInteger(pageNumber) &&
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pageNumber > 0 && pageNumber <= this.linkService.pagesCount)) {
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// Allow an unset `pageNumber` if and only if the history is still empty;
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// please refer to the `this._destination.page = null;` comment above.
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if (pageNumber !== null || this._destination) {
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console.error('PDFHistory.push: ' +
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`"${pageNumber}" is not a valid pageNumber parameter.`);
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return;
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}
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}
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let hash = namedDest || JSON.stringify(explicitDest);
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if (!hash) {
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// The hash *should* never be undefined, but if that were to occur,
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// avoid any possible issues by not updating the browser history.
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return;
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}
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let forceReplace = false;
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if (this._destination &&
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(isDestHashesEqual(this._destination.hash, hash) ||
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isDestArraysEqual(this._destination.dest, explicitDest))) {
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// When the new destination is identical to `this._destination`, and
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// its `page` is undefined, replace the current browser history entry.
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// NOTE: This can only occur if `this._destination` was set either:
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// - through the document hash being specified on load.
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// - through the user changing the hash of the document.
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if (this._destination.page) {
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return;
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}
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forceReplace = true;
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}
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if (this._popStateInProgress && !forceReplace) {
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return;
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}
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this._pushOrReplaceState({
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dest: explicitDest,
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hash,
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page: pageNumber,
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rotation: this.linkService.rotation,
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}, forceReplace);
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if (!this._popStateInProgress) {
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// Prevent the browser history from updating while the new destination is
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// being scrolled into view, to avoid potentially inconsistent state.
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this._popStateInProgress = true;
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// We defer the resetting of `this._popStateInProgress`, to account for
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// e.g. zooming occuring when the new destination is being navigated to.
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Promise.resolve().then(() => {
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this._popStateInProgress = false;
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});
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}
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}
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/**
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* Push the current position to the browser history.
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*/
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pushCurrentPosition() {
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if (!this.initialized || this._popStateInProgress) {
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return;
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}
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this._tryPushCurrentPosition();
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}
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/**
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* Go back one step in the browser history.
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* NOTE: Avoids navigating away from the document, useful for "named actions".
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*/
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back() {
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if (!this.initialized || this._popStateInProgress) {
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return;
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}
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let state = window.history.state;
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if (this._isValidState(state) && state.uid > 0) {
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window.history.back();
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}
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}
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/**
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* Go forward one step in the browser history.
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* NOTE: Avoids navigating away from the document, useful for "named actions".
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*/
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forward() {
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if (!this.initialized || this._popStateInProgress) {
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return;
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}
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let state = window.history.state;
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if (this._isValidState(state) && state.uid < this._maxUid) {
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window.history.forward();
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}
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}
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/**
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* @returns {boolean} Indicating if the user is currently moving through the
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* browser history, useful e.g. for skipping the next 'hashchange' event.
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*/
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get popStateInProgress() {
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return this.initialized &&
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(this._popStateInProgress || this._blockHashChange > 0);
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}
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/**
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* @private
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*/
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_pushOrReplaceState(destination, forceReplace = false) {
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let shouldReplace = forceReplace || !this._destination;
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let newState = {
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fingerprint: this.fingerprint,
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uid: shouldReplace ? this._uid : (this._uid + 1),
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destination,
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};
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if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME') &&
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window.history.state && window.history.state.chromecomState) {
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// history.state.chromecomState is managed by chromecom.js.
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newState.chromecomState = window.history.state.chromecomState;
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}
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this._updateInternalState(destination, newState.uid);
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if (shouldReplace) {
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window.history.replaceState(newState, '');
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} else {
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this._maxUid = this._uid;
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window.history.pushState(newState, '');
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}
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if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME') &&
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top === window) {
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// eslint-disable-next-line no-undef
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chrome.runtime.sendMessage('showPageAction');
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}
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}
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/**
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* @private
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*/
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_tryPushCurrentPosition(temporary = false) {
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if (!this._position) {
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return;
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}
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let position = this._position;
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if (temporary) {
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position = Object.assign(Object.create(null), this._position);
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position.temporary = true;
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}
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if (!this._destination) {
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this._pushOrReplaceState(position);
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return;
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}
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if (this._destination.temporary) {
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// Always replace a previous *temporary* position.
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this._pushOrReplaceState(position, /* forceReplace = */ true);
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return;
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}
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if (this._destination.hash === position.hash) {
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return; // The current document position has not changed.
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}
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if (!this._destination.page &&
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(POSITION_UPDATED_THRESHOLD <= 0 ||
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this._numPositionUpdates <= POSITION_UPDATED_THRESHOLD)) {
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// `this._destination` was set through the user changing the hash of
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// the document. Do not add `this._position` to the browser history,
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// to avoid "flooding" it with lots of (nearly) identical entries,
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// since we cannot ensure that the document position has changed.
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return;
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}
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let forceReplace = false;
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if (this._destination.page >= position.first &&
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this._destination.page <= position.page) {
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// When the `page` of `this._destination` is still visible, do not
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// update the browsing history when `this._destination` either:
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// - contains an internal destination, since in this case we
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// cannot ensure that the document position has actually changed.
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// - was set through the user changing the hash of the document.
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if (this._destination.dest || !this._destination.first) {
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return;
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}
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// To avoid "flooding" the browser history, replace the current entry.
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forceReplace = true;
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}
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this._pushOrReplaceState(position, forceReplace);
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}
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/**
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* @private
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*/
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_isValidState(state, checkReload = false) {
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if (!state) {
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return false;
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}
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if (state.fingerprint !== this.fingerprint) {
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if (checkReload) {
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// Potentially accept the history entry, even if the fingerprints don't
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// match, when the viewer was reloaded (see issue 6847).
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if (typeof state.fingerprint !== 'string' ||
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state.fingerprint.length !== this.fingerprint.length) {
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return false;
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}
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const [perfEntry] = performance.getEntriesByType('navigation');
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if (!perfEntry || perfEntry.type !== 'reload') {
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return false;
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}
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} else {
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// This should only occur in viewers with support for opening more than
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// one PDF document, e.g. the GENERIC viewer.
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return false;
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}
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}
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if (!Number.isInteger(state.uid) || state.uid < 0) {
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return false;
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}
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if (state.destination === null || typeof state.destination !== 'object') {
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return false;
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}
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return true;
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}
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/**
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* @private
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*/
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_updateInternalState(destination, uid, removeTemporary = false) {
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if (this._updateViewareaTimeout) {
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// When updating `this._destination`, make sure that we always wait for
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// the next 'updateviewarea' event before (potentially) attempting to
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// push the current position to the browser history.
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clearTimeout(this._updateViewareaTimeout);
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this._updateViewareaTimeout = null;
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}
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if (removeTemporary && destination && destination.temporary) {
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// When the `destination` comes from the browser history,
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// we no longer treat it as a *temporary* position.
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delete destination.temporary;
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}
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this._destination = destination;
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this._uid = uid;
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// This should always be reset when `this._destination` is updated.
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this._numPositionUpdates = 0;
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}
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/**
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* @private
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*/
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_updateViewarea({ location, }) {
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if (this._updateViewareaTimeout) {
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clearTimeout(this._updateViewareaTimeout);
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this._updateViewareaTimeout = null;
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}
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this._position = {
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hash: this._isViewerInPresentationMode ?
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`page=${location.pageNumber}` : location.pdfOpenParams.substring(1),
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page: this.linkService.page,
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first: location.pageNumber,
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rotation: location.rotation,
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};
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if (this._popStateInProgress) {
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return;
|
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}
|
|
|
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if (POSITION_UPDATED_THRESHOLD > 0 && this._isPagesLoaded &&
|
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this._destination && !this._destination.page) {
|
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// If the current destination was set through the user changing the hash
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// of the document, we will usually not try to push the current position
|
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// to the browser history; see `this._tryPushCurrentPosition()`.
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//
|
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// To prevent `this._tryPushCurrentPosition()` from effectively being
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// reduced to a no-op in this case, we will assume that the position
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// *did* in fact change if the 'updateviewarea' event was dispatched
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// more than `POSITION_UPDATED_THRESHOLD` times.
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this._numPositionUpdates++;
|
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}
|
|
|
|
if (UPDATE_VIEWAREA_TIMEOUT > 0) {
|
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// When closing the browser, a 'pagehide' event will be dispatched which
|
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// *should* allow us to push the current position to the browser history.
|
|
// In practice, it seems that the event is arriving too late in order for
|
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// the session history to be successfully updated.
|
|
// (For additional details, please refer to the discussion in
|
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// https://bugzilla.mozilla.org/show_bug.cgi?id=1153393.)
|
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//
|
|
// To workaround this we attempt to *temporarily* add the current position
|
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// to the browser history only when the viewer is *idle*,
|
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// i.e. when scrolling and/or zooming does not occur.
|
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//
|
|
// PLEASE NOTE: It's absolutely imperative that the browser history is
|
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// *not* updated too often, since that would render the viewer more or
|
|
// less unusable. Hence the use of a timeout to delay the update until
|
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// the viewer has been idle for `UPDATE_VIEWAREA_TIMEOUT` milliseconds.
|
|
this._updateViewareaTimeout = setTimeout(() => {
|
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if (!this._popStateInProgress) {
|
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this._tryPushCurrentPosition(/* temporary = */ true);
|
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}
|
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this._updateViewareaTimeout = null;
|
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}, UPDATE_VIEWAREA_TIMEOUT);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @private
|
|
*/
|
|
_popState({ state, }) {
|
|
let newHash = getCurrentHash(), hashChanged = this._currentHash !== newHash;
|
|
this._currentHash = newHash;
|
|
|
|
if (!state ||
|
|
(typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME') &&
|
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state.chromecomState && !this._isValidState(state))) {
|
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// This case corresponds to the user changing the hash of the document.
|
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this._uid++;
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|
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let { hash, page, rotation, } = parseCurrentHash(this.linkService);
|
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this._pushOrReplaceState({ hash, page, rotation, },
|
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/* forceReplace = */ true);
|
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return;
|
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}
|
|
if (!this._isValidState(state)) {
|
|
// This should only occur in viewers with support for opening more than
|
|
// one PDF document, e.g. the GENERIC viewer.
|
|
return;
|
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}
|
|
|
|
// Prevent the browser history from updating until the new destination,
|
|
// as stored in the browser history, has been scrolled into view.
|
|
this._popStateInProgress = true;
|
|
|
|
if (hashChanged) {
|
|
// When the hash changed, implying that the 'popstate' event will be
|
|
// followed by a 'hashchange' event, then we do *not* want to update the
|
|
// browser history when handling the 'hashchange' event (in web/app.js)
|
|
// since that would *overwrite* the new destination navigated to below.
|
|
//
|
|
// To avoid accidentally disabling all future user-initiated hash changes,
|
|
// if there's e.g. another 'hashchange' listener that stops the event
|
|
// propagation, we make sure to always force-reset `this._blockHashChange`
|
|
// after `HASH_CHANGE_TIMEOUT` milliseconds have passed.
|
|
this._blockHashChange++;
|
|
waitOnEventOrTimeout({
|
|
target: window,
|
|
name: 'hashchange',
|
|
delay: HASH_CHANGE_TIMEOUT,
|
|
}).then(() => {
|
|
this._blockHashChange--;
|
|
});
|
|
}
|
|
|
|
// Navigate to the new destination.
|
|
let destination = state.destination;
|
|
this._updateInternalState(destination, state.uid,
|
|
/* removeTemporary = */ true);
|
|
if (this._uid > this._maxUid) {
|
|
this._maxUid = this._uid;
|
|
}
|
|
|
|
if (isValidRotation(destination.rotation)) {
|
|
this.linkService.rotation = destination.rotation;
|
|
}
|
|
if (destination.dest) {
|
|
this.linkService.navigateTo(destination.dest);
|
|
} else if (destination.hash) {
|
|
this.linkService.setHash(destination.hash);
|
|
} else if (destination.page) {
|
|
// Fallback case; shouldn't be necessary, but better safe than sorry.
|
|
this.linkService.page = destination.page;
|
|
}
|
|
|
|
// Since `PDFLinkService.navigateTo` is asynchronous, we thus defer the
|
|
// resetting of `this._popStateInProgress` slightly.
|
|
Promise.resolve().then(() => {
|
|
this._popStateInProgress = false;
|
|
});
|
|
}
|
|
|
|
/**
|
|
* @private
|
|
*/
|
|
_bindEvents() {
|
|
let { _boundEvents, eventBus, } = this;
|
|
|
|
_boundEvents.updateViewarea = this._updateViewarea.bind(this);
|
|
_boundEvents.popState = this._popState.bind(this);
|
|
_boundEvents.pageHide = (evt) => {
|
|
// Attempt to push the `this._position` into the browser history when
|
|
// navigating away from the document. This is *only* done if the history
|
|
// is empty/temporary, since otherwise an existing browser history entry
|
|
// will end up being overwritten (given that new entries cannot be pushed
|
|
// into the browser history when the 'unload' event has already fired).
|
|
if (!this._destination || this._destination.temporary) {
|
|
this._tryPushCurrentPosition();
|
|
}
|
|
};
|
|
|
|
eventBus.on('updateviewarea', _boundEvents.updateViewarea);
|
|
window.addEventListener('popstate', _boundEvents.popState);
|
|
window.addEventListener('pagehide', _boundEvents.pageHide);
|
|
}
|
|
}
|
|
|
|
function isDestHashesEqual(destHash, pushHash) {
|
|
if (typeof destHash !== 'string' || typeof pushHash !== 'string') {
|
|
return false;
|
|
}
|
|
if (destHash === pushHash) {
|
|
return true;
|
|
}
|
|
let { nameddest, } = parseQueryString(destHash);
|
|
if (nameddest === pushHash) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function isDestArraysEqual(firstDest, secondDest) {
|
|
function isEntryEqual(first, second) {
|
|
if (typeof first !== typeof second) {
|
|
return false;
|
|
}
|
|
if (Array.isArray(first) || Array.isArray(second)) {
|
|
return false;
|
|
}
|
|
if (first !== null && typeof first === 'object' && second !== null) {
|
|
if (Object.keys(first).length !== Object.keys(second).length) {
|
|
return false;
|
|
}
|
|
for (let key in first) {
|
|
if (!isEntryEqual(first[key], second[key])) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
return first === second || (Number.isNaN(first) && Number.isNaN(second));
|
|
}
|
|
|
|
if (!(Array.isArray(firstDest) && Array.isArray(secondDest))) {
|
|
return false;
|
|
}
|
|
if (firstDest.length !== secondDest.length) {
|
|
return false;
|
|
}
|
|
for (let i = 0, ii = firstDest.length; i < ii; i++) {
|
|
if (!isEntryEqual(firstDest[i], secondDest[i])) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
export {
|
|
PDFHistory,
|
|
isDestHashesEqual,
|
|
isDestArraysEqual,
|
|
};
|