forked from ampproject/amphtml
/
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,
StateProperty,
UIType,
getStoreService,
} from './amp-story-store-service';
import {ActionTrust} from '../../../src/action-constants';
import {AdvancementConfig, TapNavigationDirection} from './page-advancement';
import {AmpStoryAccess} from './amp-story-access';
import {AmpStoryAnalytics} from './analytics';
import {AmpStoryBackground} from './background';
import {AmpStoryBookend} from './bookend/amp-story-bookend';
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, PageState} from './amp-story-page';
import {AmpStoryVariableService} from './variable-service';
import {CSS} from '../../../build/amp-story-1.0.css';
import {CommonSignals} from '../../../src/common-signals';
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,
createPseudoLocale,
} from './localization';
import {MediaPool, MediaType} from './media-pool';
import {NavigationState} from './navigation-state';
import {PaginationButtons} from './pagination-buttons';
import {Services} from '../../../src/services';
import {ShareMenu} from './amp-story-share-menu';
import {SwipeXYRecognizer} from '../../../src/gesture-recognizers';
import {SystemLayer} from './amp-story-system-layer';
import {UnsupportedBrowserLayer} from './amp-story-unsupported-browser-layer';
import {ViewportWarningLayer} from './amp-story-viewport-warning-layer';
import {
childElement,
childElementByTag,
childElements,
closest,
createElementWithAttributes,
escapeCssSelectorIdent,
isRTL,
scopedQuerySelectorAll,
} from '../../../src/dom';
import {
computedStyle,
px,
resetStyles,
setImportantStyles,
toggle,
} from '../../../src/style';
import {debounce} from '../../../src/utils/rate-limit';
import {dev, user} from '../../../src/log';
import {dict} from '../../../src/utils/object';
import {findIndex} from '../../../src/utils/array';
import {getConsentPolicyState} from '../../../src/consent';
import {getDetail} from '../../../src/event-helper';
import {getMode} from '../../../src/mode';
import {getState} from '../../../src/history';
import {isExperimentOn} from '../../../src/experiments';
import {registerServiceBuilder} from '../../../src/service';
import {removeAttributeInMutate, setAttributeInMutate} from './utils';
import {upgradeBackgroundAudio} from './audio';
import LocalizedStringsAr from './_locales/ar';
import LocalizedStringsDe from './_locales/de';
import LocalizedStringsDefault from './_locales/default';
import LocalizedStringsEn from './_locales/en';
import LocalizedStringsEnGb from './_locales/en-GB';
import LocalizedStringsEs from './_locales/es';
import LocalizedStringsEs419 from './_locales/es-419';
import LocalizedStringsFr from './_locales/fr';
import LocalizedStringsFrCa from './_locales/fr-CA';
import LocalizedStringsHi from './_locales/hi';
import LocalizedStringsId from './_locales/id';
import LocalizedStringsIt from './_locales/it';
import LocalizedStringsJa from './_locales/ja';
import LocalizedStringsKo from './_locales/ko';
import LocalizedStringsNl from './_locales/nl';
import LocalizedStringsNo from './_locales/no';
import LocalizedStringsPt from './_locales/pt';
import LocalizedStringsPtBr from './_locales/pt-BR';
import LocalizedStringsRu from './_locales/ru';
import LocalizedStringsTr from './_locales/tr';
import LocalizedStringsVi from './_locales/vi';
import LocalizedStringsZh from './_locales/zh';
import LocalizedStringsZhTw from './_locales/zh-TW';
/** @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;
/** @enum {string} */
const Attributes = {
STANDALONE: 'standalone',
ADVANCE_TO: 'i-amphtml-advance-to',
RETURN_TO: 'i-amphtml-return-to',
AUTO_ADVANCE_TO: 'auto-advance-to',
AD_SHOWING: 'ad-showing',
// Attributes that desktop css looks for to decide where pages will be placed
DESKTOP_POSITION: 'i-amphtml-desktop-position',
VISITED: 'i-amphtml-visited', // stacked offscreen to left
AUTO_ADVANCE_AFTER: 'auto-advance-after',
};
/** @enum {string} */
const HistoryStates = {
PAGE_ID: 'ampStoryPageId',
BOOKEND_ACTIVE: 'ampStoryBookendActive',
};
/**
* 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;
/**
* Single page ads may be injected later. If the original story contains 0 media
* elements the mediaPool will not be able to handle the injected audio/video
* Therefore we preallocate a minimum here.
* @const {number}
*/
const MINIMUM_AD_MEDIA_ELEMENTS = 2;
/**
* 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';
/**
* 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 {!./amp-story-store-service.AmpStoryStoreService} */
this.storeService_ = getStoreService(this.win);
// Check if story is RTL.
if (isRTL(this.win.document)) {
this.storeService_.dispatch(Action.TOGGLE_RTL, true);
}
/** @private {!NavigationState} */
this.navigationState_ =
new NavigationState(this.win, () => this.hasBookend_());
/** @private {!AmpStoryAnalytics} */
this.analytics_ = new AmpStoryAnalytics(this.win, this.element);
/** @private @const {!AdvancementConfig} */
this.advancement_ = AdvancementConfig.forElement(this);
this.advancement_.start();
/** @const @private {!../../../src/service/vsync-impl.Vsync} */
this.vsync_ = this.getVsync();
/** @private {?AmpStoryBookend} */
this.bookend_ = null;
/** @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, this.element);
/** @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 {!AmpStoryHint} */
this.ampStoryHint_ = new AmpStoryHint(this.win, this.element);
/** @private {!MediaPool} */
this.mediaPool_ = MediaPool.for(this);
/** @private {boolean} */
this.areAccessAuthorizationsCompleted_ = false;
/** @private */
this.navigateToPageAfterAccess_ = null;
/** @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);
/** @private @const {!../../../src/service/document-state.DocumentState} */
this.documentState_ = Services.documentStateFor(this.win);
/** @private {boolean} */
this.pausedStateToRestore_ = false;
/** @private {?Element} */
this.sidebar_ = null;
/** @private {?MutationObserver} */
this.sidebarObserver_ = null;
/** @private @const {!LocalizationService} */
this.localizationService_ = new LocalizationService(this.win);
this.localizationService_
.registerLocalizedStringBundle('default', LocalizedStringsDefault)
.registerLocalizedStringBundle('ar', LocalizedStringsAr)
.registerLocalizedStringBundle('de', LocalizedStringsDe)
.registerLocalizedStringBundle('en', LocalizedStringsEn)
.registerLocalizedStringBundle('en-GB', LocalizedStringsEnGb)
.registerLocalizedStringBundle('es', LocalizedStringsEs)
.registerLocalizedStringBundle('es-419', LocalizedStringsEs419)
.registerLocalizedStringBundle('fr', LocalizedStringsFr)
.registerLocalizedStringBundle('fr-CA', LocalizedStringsFrCa)
.registerLocalizedStringBundle('hi', LocalizedStringsHi)
.registerLocalizedStringBundle('id', LocalizedStringsId)
.registerLocalizedStringBundle('it', LocalizedStringsIt)
.registerLocalizedStringBundle('ja', LocalizedStringsJa)
.registerLocalizedStringBundle('ko', LocalizedStringsKo)
.registerLocalizedStringBundle('nl', LocalizedStringsNl)
.registerLocalizedStringBundle('no', LocalizedStringsNo)
.registerLocalizedStringBundle('pt', LocalizedStringsPt)
.registerLocalizedStringBundle('pt-BR', LocalizedStringsPtBr)
.registerLocalizedStringBundle('ru', LocalizedStringsRu)
.registerLocalizedStringBundle('tr', LocalizedStringsTr)
.registerLocalizedStringBundle('vi', LocalizedStringsVi)
.registerLocalizedStringBundle('zh', LocalizedStringsZh)
.registerLocalizedStringBundle('zh-TW', LocalizedStringsZhTw);
const enXaPseudoLocaleBundle =
createPseudoLocale(LocalizedStringsEn, s => `[${s} one two]`);
this.localizationService_
.registerLocalizedStringBundle('en-xa', enXaPseudoLocaleBundle);
registerServiceBuilder(this.win, 'localization',
() => this.localizationService_);
}
/** @override */
buildCallback() {
if (this.isStandalone_()) {
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(() => {});
const pageEl = this.element.querySelector('amp-story-page');
pageEl && pageEl.setAttribute('active', '');
this.initializeStyles_();
this.initializeListeners_();
this.initializeListenersForDev_();
if (this.isDesktop_()) {
this.storeService_.dispatch(Action.TOGGLE_UI, UIType.DESKTOP);
}
this.navigationState_.observe(stateChangeEvent => {
this.variableService_.onNavigationStateChange(stateChangeEvent);
this.analytics_.onNavigationStateChange(stateChangeEvent);
});
// Removes title in order to prevent incorrect titles appearing on link
// hover. (See 17654)
this.element.removeAttribute('title');
}
/** @override */
pauseCallback() {
// Store the current paused state, to make sure the story does not play on
// resume if it was previously paused.
this.pausedStateToRestore_ = !!this.storeService_
.get(StateProperty.PAUSED_STATE);
this.storeService_.dispatch(Action.TOGGLE_PAUSED, true);
}
/** @override */
resumeCallback() {
this.storeService_
.dispatch(Action.TOGGLE_PAUSED, this.pausedStateToRestore_);
}
/**
* Note: runs in the buildCallback vsync mutate context.
* @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();
}
/** @private */
initializeStyles_() {
const styleEl = document.querySelector('style[amp-custom]');
if (!styleEl) {
return;
}
this.rewriteStyles_(styleEl);
}
/**
* @param {!Element} styleEl
* @private
*/
rewriteStyles_(styleEl) {
if (!isExperimentOn(this.win, 'amp-story-responsive-units')) {
return;
}
// TODO(#15955): Update this to use CssContext from
// ../../../extensions/amp-animation/0.1/web-animations.js
this.mutateElement(() => {
styleEl.textContent = styleEl.textContent
.replace(/([\d.]+)vh/gmi, 'calc($1 * var(--i-amphtml-story-vh))')
.replace(/([\d.]+)vw/gmi, 'calc($1 * var(--i-amphtml-story-vw))')
.replace(/([\d.]+)vmin/gmi, 'calc($1 * var(--i-amphtml-story-vmin))')
.replace(/([\d.]+)vmax/gmi, 'calc($1 * var(--i-amphtml-story-vmax))');
});
}
/**
* @private
*/
updateViewportSizeStyles_() {
if (!this.activePage_) {
return;
}
this.vsync_.run({
measure: state => {
state.vh = this.activePage_.element./*OK*/clientHeight / 100;
state.vw = this.activePage_.element./*OK*/clientWidth / 100;
state.vmin = Math.min(state.vh, state.vw);
state.vmax = Math.max(state.vh, state.vw);
},
mutate: state => {
this.element.setAttribute('style',
`--i-amphtml-story-vh: ${px(state.vh)};` +
`--i-amphtml-story-vw: ${px(state.vw)};` +
`--i-amphtml-story-vmin: ${px(state.vmin)};` +
`--i-amphtml-story-vmax: ${px(state.vmax)};`);
},
}, {});
}
/**
* Builds the system layer DOM. This is dependent on the pages_ array having
* been initialized, so it cannot happen at build time.
* @private
*/
buildSystemLayer_() {
this.updateAudioIcon_();
const pageIds = this.pages_.map(page => page.element.id);
this.element.appendChild(this.systemLayer_.build(pageIds));
}
/** @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.advancement_.addOnTapNavigationListener(
direction => {
this.performTapNavigation_(direction);
});
this.element.addEventListener(EventType.DISPATCH_ACTION, e => {
if (!getMode().test) {
return;
}
const action = getDetail(e)['action'];
const data = getDetail(e)['data'];
this.storeService_.dispatch(action, data);
});
// Actions whitelist could be initialized empty, or with some actions some
// other components registered.
this.storeService_.subscribe(
StateProperty.ACTIONS_WHITELIST, actionsWhitelist => {
const actions = Services.actionServiceForDoc(this.getAmpDoc());
actions.setWhitelist(actionsWhitelist);
}, true /** callToInitialize */);
this.storeService_.subscribe(StateProperty.AD_STATE, isAd => {
this.onAdStateUpdate_(isAd);
});
this.storeService_.subscribe(StateProperty.BOOKEND_STATE, isActive => {
this.onBookendStateUpdate_(isActive);
});
this.storeService_.subscribe(StateProperty.CURRENT_PAGE_ID, pageId => {
this.onCurrentPageIdUpdate_(pageId);
});
this.storeService_.subscribe(StateProperty.PAUSED_STATE, isPaused => {
this.onPausedStateUpdate_(isPaused);
});
this.storeService_.subscribe(StateProperty.SIDEBAR_STATE, sidebarState => {
this.onSidebarStateUpdate_(sidebarState);
});
this.storeService_.subscribe(StateProperty.UI_STATE, uiState => {
this.onUIStateUpdate_(uiState);
}, true /** callToInitialize */);
this.win.document.addEventListener('keydown', e => {
this.onKeyDown_(e);
}, true);
// TODO(#16795): Remove once the runtime triggers pause/resume callbacks
// on document visibility change (eg: user switches tab).
this.documentState_.onVisibilityChanged(() => this.onVisibilityChanged_());
this.getViewport().onResize(debounce(this.win, () => this.onResize(), 300));
this.installGestureRecognizers_();
}
/** @private */
installGestureRecognizers_() {
const {element} = this;
const gestures = Gestures.get(element, /* shouldNotPreventDefault */ true);
// Shows "tap to navigate" hint when swiping.
gestures.onGesture(SwipeXYRecognizer, gesture => {
const {deltaX, deltaY} = gesture.data;
if (this.storeService_.get(StateProperty.BOOKEND_STATE) ||
this.storeService_.get(StateProperty.ACCESS_STATE) ||
!this.storeService_.get(StateProperty.SYSTEM_UI_IS_VISIBLE_STATE) ||
!this.storeService_
.get(StateProperty.CAN_SHOW_NAVIGATION_OVERLAY_HINT)) {
// Cancels the event for this gesture entirely, ensuring the hint won't
// show even if the user keeps swiping without releasing the touch.
gesture.event && gesture.event.preventDefault();
return;
}
if (gesture.event.defaultPrevented ||
!this.isSwipeLargeEnoughForHint_(deltaX, deltaY)) {
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_();
}
/** @override */
layoutCallback() {
if (!AmpStory.isBrowserSupported(this.win) && !this.platform_.isBot()) {
this.storeService_.dispatch(Action.TOGGLE_SUPPORTED_BROWSER, false);
return Promise.resolve();
}
return this.layoutStory_();
}
/**
* Renders the layout for the story
* @return {!Promise} A promise that is resolved when the story layout is
* loaded
* @private
*/
layoutStory_() {
const firstPageEl = user().assertElement(
this.element.querySelector('amp-story-page'),
'Story must have at least one page.');
const initialPageId = this.getHistoryState_(HistoryStates.PAGE_ID) ||
firstPageEl.id;
if (!this.paginationButtons_) {
this.buildPaginationButtons_();
}
this.initializeBookend_();
this.initializeSidebar_();
const storyLayoutPromise = this.initializePages_()
.then(() => {
this.buildSystemLayer_();
this.handleConsentExtension_();
this.initializeStoryAccess_();
this.pages_.forEach((page, index) => {
page.setState(PageState.NOT_ACTIVE);
this.upgradeCtaAnchorTagsForTracking_(page, index);
});
})
.then(() => this.initializeBookend_())
.then(() => this.switchTo_(initialPageId))
.then(() => this.updateViewportSizeStyles_())
.then(() => {
// Preloads and prerenders the share menu if mobile, where the share
// button is visible.
const uiState = this.storeService_.get(StateProperty.UI_STATE);
if (uiState === UIType.MOBILE) {
this.shareMenu_.build();
}
const infoDialog = Services.viewerForDoc(this.element).isEmbedded() ?
new InfoDialog(this.win, this.element) : null;
if (infoDialog) {
infoDialog.build();
}}
)
.then(() => this.checkForReturnToBookend_());
// 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_());
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.win, this.element, EventType.STORY_LOADED,
/* payload */ undefined, {bubbles: true});
this.signals().signal(CommonSignals.INI_LOAD);
this.mutateElement(() => {
this.element.classList.add(STORY_LOADED_CLASS_NAME);
});
}
/**
* Handles the story consent extension.
* @private
*/
handleConsentExtension_() {
const consentEl = this.element.querySelector('amp-consent');
if (!consentEl) {
return;
}
this.pauseStoryUntilConsentIsResolved_();
this.validateConsent_(consentEl);
}
/**
* Pauses the story until the consent is resolved (accepted or rejected).
* @private
*/
pauseStoryUntilConsentIsResolved_() {
const policyId = this.getConsentPolicy() || 'default';
const consentPromise = getConsentPolicyState(this.getAmpDoc(), policyId);
if (!consentPromise) {
return;
}
this.storeService_.dispatch(Action.TOGGLE_PAUSED, true);
consentPromise.then(() => {
this.storeService_.dispatch(Action.TOGGLE_PAUSED, false);
});
}
/**
* Ensures publishers using amp-consent use amp-story-consent.
* @param {!Element} consentEl
* @private
*/
validateConsent_(consentEl) {
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));
}
/**
* @private
*/
initializeStoryAccess_() {
Services.accessServiceForDocOrNull(this.getAmpDoc()).then(accessService => {
if (!accessService) {
return;
}
this.areAccessAuthorizationsCompleted_ =
accessService.areFirstAuthorizationsCompleted();
accessService.onApplyAuthorizations(
() => this.onAccessApplyAuthorizations_());
const firstPage = this.pages_[0].element;
// First amp-story-page can't be paywall protected.
// Removes the access attributes, and throws an error during development.
if (firstPage.hasAttribute('amp-access') ||
firstPage.hasAttribute('amp-access-hide')) {
firstPage.removeAttribute('amp-access');
firstPage.removeAttribute('amp-access-hide');
user().error(TAG, 'First amp-story-page cannot have amp-access ' +
'or amp-access-hide attributes');
}
});
}
/**
* On amp-access document reauthorization, maybe hide the access UI, and maybe
* perform navigation.
* @private
*/
onAccessApplyAuthorizations_() {
this.areAccessAuthorizationsCompleted_ = true;
const nextPage = this.navigateToPageAfterAccess_;
// Step out if the next page is still hidden by the access extension.
if (nextPage && nextPage.element.hasAttribute('amp-access-hide')) {
return;
}
if (nextPage) {
this.navigateToPageAfterAccess_ = null;
this.switchTo_(nextPage.element.id);
}
this.storeService_.dispatch(Action.TOGGLE_ACCESS, false);
}
/** @override */
isLayoutSupported(layout) {
return layout == Layout.CONTAINER;
}
/** @override */
prerenderAllowed() {
return true;
}
/** @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 = dev().assert(this.activePage_,
'No active page set when navigating to next page.');
const lastPage = this.pages_[this.getPageCount() - 1];
if (activePage.element.hasAttribute(Attributes.ADVANCE_TO) ||
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 = dev().assert(this.activePage_,
'No active page set when navigating to previous page.');
activePage.previous();
}
/**
* @param {number} 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);
// Step out if trying to navigate to the currently active page.
if (this.activePage_ && (this.activePage_.element.id === targetPageId)) {
return Promise.resolve();
}
// If the next page might be paywall protected, and the access
// authorizations did not resolve yet, wait before navigating.
// TODO(gmajoulet): implement a loading state.
if (targetPage.element.hasAttribute('amp-access') &&
!this.areAccessAuthorizationsCompleted_) {
this.navigateToPageAfterAccess_ = targetPage;
return Promise.resolve();
}
// If the next page is paywall protected, display the access UI and wait for
// the document to be reauthorized.
if (targetPage.element.hasAttribute('amp-access-hide')) {
this.storeService_.dispatch(Action.TOGGLE_ACCESS, true);
this.navigateToPageAfterAccess_ = targetPage;
return Promise.resolve();
}
const oldPage = this.activePage_;
this.activePage_ = targetPage;
// Each step will run in a requestAnimationFrame, and wait for the next
// frame before executing the following step.
const steps = [
// First step contains the minimum amount of code to display and play the
// target page as fast as possible.
() => {
oldPage && oldPage.element.removeAttribute('active');
if (this.storeService_.get(StateProperty.UI_STATE) === UIType.DESKTOP) {
this.setDesktopPositionAttributes_(targetPage);
}