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amp-story.js
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amp-story.js
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/**
* Copyright 2017 The AMP HTML Authors. All Rights Reserved.
*
* 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.
*/
/**
* @fileoverview Embeds a story
*
* Example:
* <code>
* <amp-story standalone>
* [...]
* </amp-story>
* </code>
*/
import './amp-story-cta-layer';
import './amp-story-grid-layer';
import './amp-story-page';
import {
Action,
AmpStoryStoreService,
StateProperty,
} from './amp-story-store-service';
import {ActionTrust} from '../../../src/action-constants';
import {AmpStoryAnalytics} from './analytics';
import {AmpStoryBackground} from './background';
import {AmpStoryConsent} from './amp-story-consent';
import {AmpStoryCtaLayer} from './amp-story-cta-layer';
import {AmpStoryGridLayer} from './amp-story-grid-layer';
import {AmpStoryHint} from './amp-story-hint';
import {AmpStoryPage} from './amp-story-page';
import {AmpStoryRequestService} from './amp-story-request-service';
import {AmpStoryVariableService} from './variable-service';
import {Bookend} from './amp-story-bookend';
import {CSS} from '../../../build/amp-story-0.1.css';
import {CommonSignals} from '../../../src/common-signals';
import {
DoubletapRecognizer,
SwipeXYRecognizer,
} from '../../../src/gesture-recognizers';
import {EventType, dispatch} from './events';
import {Gestures} from '../../../src/gesture';
import {InfoDialog} from './amp-story-info-dialog';
import {Keys} from '../../../src/utils/key-codes';
import {Layout} from '../../../src/layout';
import {
LocalizationService,
LocalizedStringId,
createPseudoLocale,
} from './localization';
import {MediaPool, MediaType} from './media-pool';
import {NavigationState} from './navigation-state';
import {ORIGIN_WHITELIST} from './origin-whitelist';
import {PaginationButtons} from './pagination-buttons';
import {Services} from '../../../src/services';
import {ShareMenu} from './amp-story-share-menu';
import {ShareWidget} from './amp-story-share';
import {SystemLayer} from './amp-story-system-layer';
import {TapNavigationDirection} from './page-advancement';
import {UnsupportedBrowserLayer} from './amp-story-unsupported-browser-layer';
import {ViewportWarningLayer} from './amp-story-viewport-warning-layer';
import {
childElement,
childElementByTag,
childElements,
closest,
matches,
removeElement,
scopedQuerySelectorAll,
} from '../../../src/dom';
import {
computedStyle,
resetStyles,
setImportantStyles,
toggle,
} from '../../../src/style';
import {debounce} from '../../../src/utils/rate-limit';
import {dev, devAssert, user} from '../../../src/log';
import {dict} from '../../../src/utils/object';
import {escapeCssSelectorIdent} from '../../../src/css';
import {findIndex} from '../../../src/utils/array';
import {getDetail} from '../../../src/event-helper';
import {getMode} from '../../../src/mode';
import {getSourceOrigin, parseUrlDeprecated} from '../../../src/url';
import {getState} from '../../../src/history';
import {isExperimentOn, toggleExperiment} from '../../../src/experiments';
import {registerServiceBuilder} from '../../../src/service';
import {renderSimpleTemplate} from './simple-template';
import {stringHash32} from '../../../src/string';
import {upgradeBackgroundAudio} from './audio';
import LocalizedStringsDefault from './_locales/default';
import LocalizedStringsEn from './_locales/en';
/** @private @const {string} */
const PRE_ACTIVE_PAGE_ATTRIBUTE_NAME = 'pre-active';
/** @private @const {string} */
const AMP_STORY_STANDALONE_ATTRIBUTE = 'standalone';
/** @private @const {number} */
const DESKTOP_WIDTH_THRESHOLD = 1024;
/** @private @const {number} */
const DESKTOP_HEIGHT_THRESHOLD = 550;
/** @private @const {number} */
const MIN_SWIPE_FOR_HINT_OVERLAY_PX = 50;
/** @private @const {string} */
const ADVANCE_TO_ATTR = 'i-amphtml-advance-to';
/** @private @const {string} */
const RETURN_TO_ATTR = 'i-amphtml-return-to';
/** @private @const {string} */
const AUTO_ADVANCE_TO_ATTR = 'auto-advance-to';
/** @private @const {string} */
const AD_SHOWING_ATTR = 'ad-showing';
/**
* The duration of time (in milliseconds) to wait for a page to be loaded,
* before the story becomes visible.
* @const {number}
*/
const PAGE_LOAD_TIMEOUT_MS = 5000;
/**
* CSS class for an amp-story that indicates the initial load for the story has
* completed.
* @const {string}
*/
const STORY_LOADED_CLASS_NAME = 'i-amphtml-story-loaded';
/** @const {!Object<string, number>} */
const MAX_MEDIA_ELEMENT_COUNTS = {
[MediaType.AUDIO]: 4,
[MediaType.VIDEO]: 8,
};
/** @type {string} */
const TAG = 'amp-story';
/**
* Container for "pill-style" share widget, rendered on desktop.
* @private @const {!./simple-template.ElementDef}
*/
const SHARE_WIDGET_PILL_CONTAINER = {
tag: 'div',
attrs: dict({'class': 'i-amphtml-story-share-pill'}),
children: [
{
tag: 'span',
attrs: dict({'class': 'i-amphtml-story-share-pill-label'}),
localizedStringId:
LocalizedStringId.AMP_STORY_SYSTEM_LAYER_SHARE_WIDGET_LABEL,
},
],
};
/**
* Selector for elements that should be hidden when the bookend is open on
* desktop view.
* @private @const {string}
*/
const HIDE_ON_BOOKEND_SELECTOR =
'amp-story-page, .i-amphtml-story-system-layer';
/**
* @implements {./media-pool.MediaPoolRoot}
*/
export class AmpStory extends AMP.BaseElement {
/** @param {!AmpElement} element */
constructor(element) {
super(element);
/** @private @const {!AmpStoryStoreService} */
this.storeService_ = new AmpStoryStoreService(this.win);
registerServiceBuilder(
this.win, 'story-store', () => this.storeService_);
/** @private @const {!AmpStoryRequestService} */
this.requestService_ = new AmpStoryRequestService(this.win, this.element);
registerServiceBuilder(
this.win, 'story-request-v01', () => this.requestService_);
/** @private {!NavigationState} */
this.navigationState_ =
new NavigationState(this.win, () => this.hasBookend_());
/** @private {!AmpStoryAnalytics} */
this.analytics_ = new AmpStoryAnalytics(this.win, this.element);
/** @const @private {!../../../src/service/vsync-impl.Vsync} */
this.vsync_ = this.getVsync();
/** @private @const {!LocalizationService} */
this.localizationService_ = new LocalizationService(this.win);
this.localizationService_
.registerLocalizedStringBundle('default', LocalizedStringsDefault)
.registerLocalizedStringBundle('en', LocalizedStringsEn);
const enXaPseudoLocaleBundle =
createPseudoLocale(LocalizedStringsEn, s => `[${s} one two]`);
this.localizationService_
.registerLocalizedStringBundle('en-xa', enXaPseudoLocaleBundle);
registerServiceBuilder(
this.win, 'localization-v01', () => this.localizationService_);
/** @private @const {!Bookend} */
this.bookend_ = new Bookend(this.win, this.element);
/** @private @const {!ShareMenu} Preloads and prerenders the share menu. */
this.shareMenu_ = new ShareMenu(this.win, this.element);
/** @private @const {!SystemLayer} */
this.systemLayer_ = new SystemLayer(this.win);
/** @private @const {!UnsupportedBrowserLayer} */
this.unsupportedBrowserLayer_ = new UnsupportedBrowserLayer(this.win);
/** Instantiates the viewport warning layer. */
new ViewportWarningLayer(this.win, this.element);
/** @private @const {!Array<!./amp-story-page.AmpStoryPage>} */
this.pages_ = [];
/** @private @const {!Array<!./amp-story-page.AmpStoryPage>} */
this.adPages_ = [];
/** @const @private {!AmpStoryVariableService} */
this.variableService_ = new AmpStoryVariableService();
registerServiceBuilder(
this.win, 'story-variable', () => this.variableService_.get());
/** @private {?./amp-story-page.AmpStoryPage} */
this.activePage_ = null;
/** @private @const */
this.desktopMedia_ = this.win.matchMedia(
`(min-width: ${DESKTOP_WIDTH_THRESHOLD}px) and ` +
`(min-height: ${DESKTOP_HEIGHT_THRESHOLD}px)`);
/** @private @const */
this.canRotateToDesktopMedia_ = this.win.matchMedia(
`(min-width: ${DESKTOP_HEIGHT_THRESHOLD}px) and ` +
`(min-height: ${DESKTOP_WIDTH_THRESHOLD}px)`);
/** @private {?AmpStoryBackground} */
this.background_ = null;
/** @private {?HTMLMediaElement} */
this.backgroundAudioEl_ = null;
/** @private {?./pagination-buttons.PaginationButtons} */
this.paginationButtons_ = null;
/** @private {?Element} */
this.topBar_ = null;
/** @private {?ShareWidget} */
this.shareWidget_ = null;
/** @private @const {!Array<string>} */
this.originWhitelist_ = ORIGIN_WHITELIST;
/** @private {!AmpStoryHint} */
this.ampStoryHint_ = new AmpStoryHint(this.win, this.element);
/** @private {!MediaPool} */
this.mediaPool_ = MediaPool.for(this);
/** @private @const {!../../../src/service/timer-impl.Timer} */
this.timer_ = Services.timerFor(this.win);
/** @private @const {!../../../src/service/platform-impl.Platform} */
this.platform_ = Services.platformFor(this.win);
}
/** @override */
buildCallback() {
this.assertAmpStoryExperiment_();
if (this.element.hasAttribute(AMP_STORY_STANDALONE_ATTRIBUTE)) {
this.initializeStandaloneStory_();
}
// buildCallback already runs in a mutate context. Calling another
// mutateElement explicitly will force the runtime to remeasure the
// amp-story element, fixing rendering bugs where the story is inactive
// (layoutCallback not called) when accessed from any viewer using
// prerendering, because of a height incorrectly set to 0.
this.mutateElement(() => {});
this.element.querySelector('amp-story-page').setAttribute('active', '');
this.initializeListeners_();
this.initializeListenersForDev_();
if (this.isDesktop_()) {
this.storeService_.dispatch(Action.TOGGLE_DESKTOP, true);
}
this.navigationState_.observe(stateChangeEvent => {
this.variableService_.onNavigationStateChange(stateChangeEvent);
this.analytics_.onNavigationStateChange(stateChangeEvent);
});
}
/** @private */
initializeStandaloneStory_() {
const html = this.win.document.documentElement;
html.classList.add('i-amphtml-story-standalone');
// Lock body to prevent overflow.
this.lockBody_();
// Standalone CSS affects sizing of the entire page.
this.onResize();
}
/**
* Builds the system layer DOM. This is dependent on the pages_ array having
* been initialized, so it cannot happen at build time.
* @private
*/
buildSystemLayer_() {
const pageIds = this.pages_.map(page => page.element.id);
this.element.appendChild(this.systemLayer_.build(pageIds));
this.updateAudioIcon_();
}
/** @private */
initializeListeners_() {
this.element.addEventListener(EventType.NEXT_PAGE, () => {
this.next_();
});
this.element.addEventListener(EventType.PREVIOUS_PAGE, () => {
this.previous_();
});
this.storeService_.subscribe(StateProperty.MUTED_STATE, isMuted => {
this.onMutedStateUpdate_(isMuted);
this.variableService_.onMutedStateChange(isMuted);
}, true /** callToInitialize */);
this.storeService_.subscribe(StateProperty.MUTED_STATE, isMuted => {
// We do not want to trigger an analytics event for the initialization of
// the muted state.
this.analytics_.onMutedStateChange(isMuted);
}, false /** callToInitialize */);
this.storeService_.subscribe(
StateProperty.SUPPORTED_BROWSER_STATE, isBrowserSupported => {
this.onSupportedBrowserStateUpdate_(isBrowserSupported);
});
this.element.addEventListener(EventType.SWITCH_PAGE, e => {
if (this.storeService_.get(StateProperty.BOOKEND_STATE)) {
// Disallow switching pages while the bookend is active.
return;
}
this.switchTo_(getDetail(e)['targetPageId']);
this.ampStoryHint_.hideAllNavigationHint();
});
this.element.addEventListener(EventType.PAGE_PROGRESS, e => {
const detail = getDetail(e);
const pageId = detail['pageId'];
const progress = detail['progress'];
if (pageId !== this.activePage_.element.id) {
// Ignore progress update events from inactive pages.
return;
}
if (!this.activePage_.isAd()) {
this.systemLayer_.updateProgress(pageId, progress);
}
});
this.element.addEventListener(EventType.REPLAY, () => {
this.replay_();
});
this.element.addEventListener(EventType.SHOW_NO_PREVIOUS_PAGE_HELP, () => {
if (this.storeService_.get(StateProperty.CAN_SHOW_PREVIOUS_PAGE_HELP)) {
this.ampStoryHint_.showFirstPageHintOverlay();
}
});
this.element.addEventListener(EventType.TAP_NAVIGATION, e => {
const direction = getDetail(e)['direction'];
this.performTapNavigation_(direction);
});
this.storeService_.subscribe(StateProperty.BOOKEND_STATE, isActive => {
this.onBookendStateUpdate_(isActive);
});
this.storeService_.subscribe(StateProperty.DESKTOP_STATE, isDesktop => {
this.onDesktopStateUpdate_(isDesktop);
}, true /** callToInitialize */);
this.win.document.addEventListener('keydown', e => {
this.onKeyDown_(e);
}, true);
this.storeService_.subscribe(StateProperty.CURRENT_PAGE_ID, pageId => {
this.onCurrentPageIdUpdate_(pageId);
});
this.getViewport().onResize(debounce(this.win, () => this.onResize(), 300));
this.installGestureRecognizers_();
}
/** @private */
installGestureRecognizers_() {
const {element} = this;
const gestures = Gestures.get(element, /* shouldNotPreventDefault */ true);
// Disables zoom on double-tap.
gestures.onGesture(DoubletapRecognizer, gesture => {
const {event} = gesture;
event.preventDefault();
});
// Shows "tap to navigate" hint when swiping.
gestures.onGesture(SwipeXYRecognizer, gesture => {
const {deltaX, deltaY} = gesture.data;
if (this.storeService_.get(StateProperty.BOOKEND_STATE)) {
return;
}
if (!this.isSwipeLargeEnoughForHint_(deltaX, deltaY)) {
return;
}
if (!this.storeService_
.get(StateProperty.CAN_SHOW_NAVIGATION_OVERLAY_HINT)) {
return;
}
this.ampStoryHint_.showNavigationOverlay();
});
}
/**
* @param {number} deltaX
* @param {number} deltaY
* @return {boolean}
* @private
*/
isSwipeLargeEnoughForHint_(deltaX, deltaY) {
const sideSwipe = Math.abs(deltaX) >= MIN_SWIPE_FOR_HINT_OVERLAY_PX;
const upSwipe = (-1 * deltaY) >= MIN_SWIPE_FOR_HINT_OVERLAY_PX;
return sideSwipe || upSwipe;
}
/** @private */
initializeListenersForDev_() {
if (!getMode().development) {
return;
}
this.element.addEventListener(EventType.DEV_LOG_ENTRIES_AVAILABLE, e => {
this.systemLayer_.logAll(/** @type {?} */ (getDetail(e)));
});
}
/** @private */
lockBody_() {
const {document} = this.win;
setImportantStyles(document.documentElement, {
'overflow': 'hidden',
});
setImportantStyles(document.body, {
'overflow': 'hidden',
});
this.getViewport().resetTouchZoom();
this.getViewport().disableTouchZoom();
this.maybeLockScreenOrientation_();
}
/** @private */
maybeLockScreenOrientation_() {
const {screen} = this.win;
if (!screen || !this.canRotateToDesktopMedia_.matches) {
return;
}
const lockOrientation = screen.lockOrientation ||
screen.mozLockOrientation || screen.msLockOrientation ||
(unusedOrientation => {});
try {
lockOrientation('portrait');
} catch (e) {
dev().warn(TAG, 'Failed to lock screen orientation:', e.message);
}
}
/** @private */
buildPaginationButtons_() {
this.paginationButtons_ = PaginationButtons.create(this.win);
this.paginationButtons_.attach(this.element);
this.navigationState_.observe(e =>
this.paginationButtons_.onNavigationStateChange(e));
}
/** @visibleForTesting */
buildPaginationButtonsForTesting() {
this.buildPaginationButtons_();
}
/** @private */
buildTopBar_() {
const doc = this.element.ownerDocument;
this.topBar_ = doc.createElement('div');
this.topBar_.classList.add(
'i-amphtml-story-top', 'i-amphtml-story-system-reset');
this.topBar_.appendChild(this.buildTopBarShare_());
this.element.insertBefore(this.topBar_, this.element.firstChild);
}
/**
* @return {!Node}
* @private
*/
buildTopBarShare_() {
const container =
renderSimpleTemplate(this.win.document, SHARE_WIDGET_PILL_CONTAINER);
this.shareWidget_ = new ShareWidget(this.win);
const shareLabelEl = dev().assertElement(
container.querySelector('.i-amphtml-story-share-pill-label'),
'Expected share pill label to be present.');
container.insertBefore(
this.shareWidget_.build(this.getAmpDoc()),
shareLabelEl);
return container;
}
/** @override */
layoutCallback() {
if (!AmpStory.isBrowserSupported(this.win) && !this.platform_.isBot()) {
this.storeService_.dispatch(Action.TOGGLE_SUPPORTED_BROWSER, false);
return Promise.resolve();
}
const firstPageEl = user().assertElement(
this.element.querySelector('amp-story-page'),
'Story must have at least one page.');
const initialPageId = this.getHistoryStatePageId_() || firstPageEl.id;
if (!this.paginationButtons_) {
this.buildPaginationButtons_();
}
const storyLayoutPromise = this.initializePages_()
.then(() => this.buildSystemLayer_())
.then(() => {
this.pages_.forEach(page => {
page.setActive(false);
});
})
.then(() => this.switchTo_(initialPageId))
.then(() => this.preloadPagesByDistance_())
.then(() => {
// Preloads and prerenders the share menu if mobile, where the share
// button is visible.
if (!this.storeService_.get(StateProperty.DESKTOP_STATE)) {
this.shareMenu_.build();
}
const infoDialog = Services.viewerForDoc(this.element).isEmbedded() ?
new InfoDialog(this.win, this.element) : null;
if (infoDialog) {
infoDialog.build();
}
});
// Do not block the layout callback on the completion of these promises, as
// that prevents descendents from being laid out (and therefore loaded).
storyLayoutPromise.then(() => this.whenPagesLoaded_(PAGE_LOAD_TIMEOUT_MS))
.then(() => this.markStoryAsLoaded_());
this.validateConsent_();
return storyLayoutPromise;
}
/**
* @param {number} timeoutMs The maximum amount of time to wait, in
* milliseconds.
* @return {!Promise} A promise that is resolved when the page is loaded or
* the timeout has been exceeded, whichever happens first.
* @private
*/
whenPagesLoaded_(timeoutMs = 0) {
const pagesToWaitFor = this.isDesktop_() ?
[this.pages_[0], this.pages_[1]] :
[this.pages_[0]];
const storyLoadPromise = Promise.all(
pagesToWaitFor.filter(page => !!page).map(page => page.whenLoaded()));
return this.timer_.timeoutPromise(timeoutMs, storyLoadPromise)
.catch(() => {});
}
/** @private */
markStoryAsLoaded_() {
dispatch(this.element, EventType.STORY_LOADED, true);
this.signals().signal(CommonSignals.INI_LOAD);
this.mutateElement(() => {
this.element.classList.add(STORY_LOADED_CLASS_NAME);
});
}
/**
* Ensures publishers using amp-consent use amp-story-consent.
* @private
*/
validateConsent_() {
const consentEl = this.element.querySelector('amp-consent');
if (!consentEl) {
return;
}
if (!childElementByTag(consentEl, 'amp-story-consent')) {
dev().error(TAG, 'amp-consent must have an amp-story-consent child');
}
const allowedTags = ['SCRIPT', 'AMP-STORY-CONSENT'];
const toRemoveChildren = childElements(
consentEl, el => allowedTags.indexOf(el.tagName) === -1);
if (toRemoveChildren.length === 0) {
return;
}
dev().error(TAG, `amp-consent only allows tags: ${allowedTags}`);
toRemoveChildren.forEach(el => consentEl.removeChild(el));
}
/** @override */
isLayoutSupported(layout) {
return layout == Layout.CONTAINER;
}
/** @override */
prerenderAllowed() {
return true;
}
/** @private */
isAmpStoryEnabled_() {
if (isExperimentOn(this.win, 'amp-story') || getMode().test ||
this.win.location.protocol === 'file:') {
return true;
}
const origin = getSourceOrigin(this.win.location);
return this.isOriginWhitelisted_(origin);
}
/**
* @param {string} domain The domain part of the origin, to be hashed.
* @return {string} The hashed origin.
* @private
*/
hashOrigin_(domain) {
return stringHash32(domain.toLowerCase());
}
/**
* @param {string} origin The origin to check.
* @return {boolean} Whether the specified origin is whitelisted to use the
* amp-story extension.
* @private
*/
isOriginWhitelisted_(origin) {
const hostName = parseUrlDeprecated(origin).hostname;
const domains = hostName.split('.');
// Check all permutations of the domain to see if any level of the domain is
// whitelisted. Taking the example of the whitelisted domain
// example.co.uk, if the page is served from www.example.co.uk/page.html:
//
// www.example.co.uk => false
// example.co.uk => true
// co.uk => false
// uk => false
//
// This is necessary, since we don't have any guarantees of which level of
// the domain is whitelisted. For many domains (e.g. .com), the second
// level of the domain is likely to be whitelisted, whereas for others
// (e.g. .co.uk) the third level may be whitelisted. Additionally, this
// allows subdomains to be whitelisted individually.
return domains.some((unusedDomain, index) => {
const domain = domains.slice(index, domains.length).join('.');
const domainHash = this.hashOrigin_(domain);
return this.originWhitelist_.includes(domainHash);
});
}
/** @private */
assertAmpStoryExperiment_() {
if (this.isAmpStoryEnabled_()) {
return;
}
const errorIconEl = this.win.document.createElement('div');
errorIconEl.classList.add('i-amphtml-story-experiment-icon');
errorIconEl.classList.add('i-amphtml-story-experiment-icon-error');
const errorMsgEl = this.win.document.createElement('span');
errorMsgEl.textContent = this.localizationService_.getLocalizedString(
LocalizedStringId.AMP_STORY_WARNING_EXPERIMENT_DISABLED_TEXT);
const experimentsLinkEl = this.win.document.createElement('button');
experimentsLinkEl.textContent = this.localizationService_
.getLocalizedString(
LocalizedStringId.AMP_STORY_EXPERIMENT_ENABLE_BUTTON_LABEL);
experimentsLinkEl.addEventListener('click', () => {
toggleExperiment(this.win, 'amp-story', true);
errorIconEl.classList.remove('i-amphtml-story-experiment-icon-error');
errorIconEl.classList.add('i-amphtml-story-experiment-icon-done');
errorMsgEl.textContent = this.localizationService_.getLocalizedString(
LocalizedStringId.AMP_STORY_EXPERIMENT_ENABLED_TEXT);
removeElement(experimentsLinkEl);
});
const errorEl = this.win.document.createElement('div');
errorEl.classList.add('i-amphtml-story-experiment-error');
errorEl.appendChild(errorIconEl);
errorEl.appendChild(errorMsgEl);
errorEl.appendChild(experimentsLinkEl);
this.element.appendChild(errorEl);
user().error(TAG, 'enable amp-story experiment');
}
/** @private */
initializePages_() {
const pageImplPromises = Array.prototype.map.call(
this.element.querySelectorAll('amp-story-page'),
(pageEl, index) => {
return pageEl.getImpl().then(pageImpl => {
this.pages_[index] = pageImpl;
});
});
return Promise.all(pageImplPromises);
}
/**
* Advance to the next screen in the story, if there is one.
* @param {boolean=} opt_isAutomaticAdvance Whether this navigation was caused
* by an automatic advancement after a timeout.
* @private
*/
next_(opt_isAutomaticAdvance) {
const activePage = devAssert(this.activePage_,
'No active page set when navigating to next page.');
const lastPage = this.pages_[this.getPageCount() - 1];
if (activePage.element.hasAttribute(ADVANCE_TO_ATTR) ||
activePage !== lastPage) {
activePage.next(opt_isAutomaticAdvance);
} else {
this.hasBookend_().then(hasBookend => {
if (hasBookend) {
this.showBookend_();
}
});
}
}
/**
* Go back to the previous screen in the story, if there is one.
* @private
*/
previous_() {
const activePage = devAssert(this.activePage_,
'No active page set when navigating to next page.');
activePage.previous();
}
/**
* @param {!TapNavigationDirection} direction The direction to navigate.
* @private
*/
performTapNavigation_(direction) {
if (this.isDesktop_()) {
this.next_();
return;
}
if (direction === TapNavigationDirection.NEXT) {
this.next_();
} else if (direction === TapNavigationDirection.PREVIOUS) {
this.previous_();
}
}
/**
* Switches to a particular page.
* @param {string} targetPageId
* @return {!Promise}
*/
switchTo_(targetPageId) {
const targetPage = this.getPageById(targetPageId);
const pageIndex = this.getPageIndex(targetPage);
this.storeService_.dispatch(Action.CHANGE_PAGE, {
id: targetPageId,
index: pageIndex,
});
this.updateBackground_(targetPage.element, /* initial */ !this.activePage_);
if (targetPage.isAd()) {
this.vsync_.mutate(() => {
this.element.setAttribute(AD_SHOWING_ATTR, '');
});
} else {
this.vsync_.mutate(() => {
this.element.removeAttribute(AD_SHOWING_ATTR);
});
// TODO(alanorozco): decouple this using NavigationState
this.systemLayer_.setActivePageId(targetPageId);
}
// TODO(alanorozco): check if autoplay
this.navigationState_.updateActivePage(
pageIndex,
this.getPageCount(),
targetPage.element.id);
const oldPage = this.activePage_;
// TODO(cvializ): Move this to the page class?
const activePriorSibling = targetPage.element.previousElementSibling;
const previousActivePriorSibling = this.element.querySelector(
`[${escapeCssSelectorIdent(PRE_ACTIVE_PAGE_ATTRIBUTE_NAME)}]`);
this.activePage_ = targetPage;
this.systemLayer_.resetDeveloperLogs();
this.systemLayer_.setDeveloperLogContextString(
this.activePage_.element.id);
return targetPage.beforeVisible().then(() => {
this.triggerActiveEventForPage_();
if (oldPage) {
oldPage.setActive(false);
}
targetPage.setActive(true);
if (activePriorSibling &&
matches(activePriorSibling, 'amp-story-page')) {
activePriorSibling.setAttribute(PRE_ACTIVE_PAGE_ATTRIBUTE_NAME, '');
}
if (previousActivePriorSibling) {
previousActivePriorSibling.removeAttribute(
PRE_ACTIVE_PAGE_ATTRIBUTE_NAME);
}
// If first navigation.
if (!oldPage) {
this.registerAndPreloadBackgroundAudio_();
}
this.preloadPagesByDistance_();
this.reapplyMuting_();
this.forceRepaintForSafari_();
this.maybePreloadBookend_();
});
}
/** @private */
triggerActiveEventForPage_() {
// TODO(alanorozco): pass event priority once amphtml-story repo is merged
// with upstream.
Services.actionServiceForDoc(this.element)
.trigger(this.activePage_.element, 'active', /* event */ null,
ActionTrust.HIGH);
}
/**
* For some reason, Safari has an issue where sometimes when pages become
* visible, some descendants are not painted. This is a hack where we detect
* that the browser is Safari and force it to repaint, to avoid this case.
* See newmuis/amphtml-story#106 for details.
* @private
*/
forceRepaintForSafari_() {
if (!this.platform_.isSafari() && !this.platform_.isIos()) {
return;
}
if (this.isDesktop_()) {
// Force repaint is only needed when transitioning from invisible to
// visible
return;
}
this.mutateElement(() => {
toggle(this.element, false);
// Reading the height is what forces the repaint. The conditional exists
// only to workaround the fact that the closure compiler would otherwise
// think that only reading the height has no effect. Since the height is
// always >= 0, this conditional will always be executed.
const height = this.element./*OK*/offsetHeight;
if (height >= 0) {
toggle(this.element, true);
}
});
}
/**
* Handles all key presses within the story.
* @param {!Event} e The keydown event.
* @private
*/
onKeyDown_(e) {
if (this.storeService_.get(StateProperty.BOOKEND_STATE)) {
return;
}
switch (e.key) {
// TODO(newmuis): This will need to be flipped for RTL.
case Keys.LEFT_ARROW:
this.previous_();
break;
case Keys.RIGHT_ARROW:
this.next_();
break;
}
}
/**
* @param {string} pageId new current page id
* @private
* */
onCurrentPageIdUpdate_(pageId) {
this.setHistoryStatePageId_(pageId);
}
/**
* Save page id using history API.
* @param {string} pageId page id to be saved