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amp-story.js
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amp-story.js
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/**
* @fileoverview Embeds a story
*
* Example:
* <code>
* <amp-story standalone>
* [...]
* </amp-story>
* </code>
*/
import './amp-story-grid-layer';
import './amp-story-page';
import {ActionTrust_Enum} from '#core/constants/action-constants';
import {AmpEvents_Enum} from '#core/constants/amp-events';
import {CommonSignals_Enum} from '#core/constants/common-signals';
import {Keys_Enum} from '#core/constants/key-codes';
import {VisibilityState_Enum} from '#core/constants/visibility-state';
import {Deferred} from '#core/data-structures/promise';
import {isRTL, removeElement} from '#core/dom';
import {whenUpgradedToCustomElement} from '#core/dom/amp-element-helpers';
import {escapeCssSelectorIdent} from '#core/dom/css-selectors';
import * as Preact from '#core/dom/jsx';
import {Layout_Enum} from '#core/dom/layout';
import {prefersReducedMotion} from '#core/dom/media-query-props';
import {
childElement,
childElementByTag,
childElements,
childNodes,
closest,
matches,
scopedQuerySelector,
scopedQuerySelectorAll,
} from '#core/dom/query';
import {
computedStyle,
getStyle,
px,
setImportantStyles,
toggle,
} from '#core/dom/style';
import {devError} from '#core/error';
import {clamp} from '#core/math';
import {isEsm} from '#core/mode';
import {findIndex, lastItem, toArray} from '#core/types/array';
import {debounce} from '#core/types/function';
import {map} from '#core/types/object';
import {tryParseJson} from '#core/types/object/json';
import {endsWith} from '#core/types/string';
import {parseQueryString} from '#core/types/string/url';
import {getHistoryState as getWindowHistoryState} from '#core/window/history';
import {getExperimentBranch, isExperimentOn} from '#experiments';
import {StoryAdSegmentExp} from '#experiments/story-ad-progress-segment';
import {Services} from '#service';
import {calculateExtensionFileUrl} from '#service/extension-script';
import {getDetail} from '#utils/event-helper';
import {dev, devAssert, user} from '#utils/log';
import {AmpStoryConsent} from './amp-story-consent';
import {AmpStoryEmbeddedComponent} from './amp-story-embedded-component';
import {AmpStoryGridLayer} from './amp-story-grid-layer';
import {AmpStoryHint} from './amp-story-hint';
import {InfoDialog} from './amp-story-info-dialog';
import {
getLocalizationService,
getSupportedLanguageCode,
} from './amp-story-localization-service';
import {AmpStoryPage, NavigationDirection, PageState} from './amp-story-page';
import {AmpStoryShare} from './amp-story-share';
import {
Action,
EmbeddedComponentState,
InteractiveComponentDef,
StateProperty,
SubscriptionsState,
UIType_Enum,
getStoreService,
} from './amp-story-store-service';
import {SystemLayer} from './amp-story-system-layer';
import {renderUnsupportedBrowserLayer} from './amp-story-unsupported-browser-layer';
import {AmpStoryViewerMessagingHandler} from './amp-story-viewer-messaging-handler';
import {upgradeBackgroundAudio} from './audio';
import {BackgroundBlur} from './background-blur';
import {isPreviewMode} from './embed-mode';
import {EventType, dispatch} from './events';
import {HistoryState, getHistoryState, setHistoryState} from './history';
import {LiveStoryManager} from './live-story-manager';
import {MediaPool, MediaType_Enum} from './media-pool';
import {AdvancementConfig, TapNavigationDirection} from './page-advancement';
import {PaginationButtons} from './pagination-buttons';
import {
AdvancementMode,
StoryAnalyticsEvent,
getAnalyticsService,
} from './story-analytics';
import {
isTransformed,
removeAttributeInMutate,
setAttributeInMutate,
shouldShowStoryUrlInfo,
} from './utils';
import {AnalyticsVariable, getVariableService} from './variable-service';
import {CSS} from '../../../build/amp-story-1.0.css';
import {getConsentPolicyState} from '../../../src/consent';
import {Gestures} from '../../../src/gesture';
import {SwipeXYRecognizer} from '../../../src/gesture-recognizers';
import {getMode, isModeDevelopment} from '../../../src/mode';
/** @private @const {number} */
const DESKTOP_WIDTH_THRESHOLD = 1024;
/** @private @const {number} */
const DESKTOP_HEIGHT_THRESHOLD = 550;
/**
* NOTE: If udpated here, update in amp-story-player-impl.js
* @private @const {string}
*/
const DESKTOP_ONE_PANEL_ASPECT_RATIO_THRESHOLD = '31 / 40';
/** @private @const {number} */
const MIN_SWIPE_FOR_HINT_OVERLAY_PX = 50;
/** @enum {string} */
const Attributes = {
AD_SHOWING: 'ad-showing',
ADVANCE_TO: 'i-amphtml-advance-to',
AUTO_ADVANCE_AFTER: 'auto-advance-after',
AUTO_ADVANCE_TO: 'auto-advance-to',
MUTED: 'muted',
ORIENTATION: 'orientation',
PUBLIC_ADVANCE_TO: 'advance-to',
RETURN_TO: 'i-amphtml-return-to',
STANDALONE: 'standalone',
SUPPORTS_LANDSCAPE: 'supports-landscape',
// Attributes that desktop css looks for to decide where pages will be placed
VISITED: 'i-amphtml-visited', // stacked offscreen to left
};
/**
* The duration of time (in milliseconds) to wait for the Story initial content
* to be loaded before marking the story as loaded.
* @const {number}
*/
const INITIAL_CONTENT_LOAD_TIMEOUT_MS = 8000;
/**
* 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_Enum.AUDIO]: 4,
[MediaType_Enum.VIDEO]: 8,
};
/**
* The number of milliseconds to wait before showing the paywall on paywall page.
* @const {number}
*/
export const SUBSCRIPTIONS_DELAY_DURATION = 500;
/** @type {string} */
const TAG = 'amp-story';
/**
* The default dark gray for chrome supported theme color.
* @const {string}
*/
const DEFAULT_THEME_COLOR = '#202125';
/**
* The default number of story pages that should be shown in preview mode
* before the preview is considered to be finished.
* @const {number}
*/
const DEFAULT_MIN_PAGES_TO_PREVIEW = 1;
/**
* The default percentage of the total number of story pages that should be
* shown in preview mode before the preview is considered to be finished.
* @const {number}
*/
const DEFAULT_PCT_PAGES_TO_PREVIEW = 30;
/*
* @implements {./media-pool.MediaPoolRoot}
*/
export class AmpStory extends AMP.BaseElement {
/** @override */
static prerenderAllowed() {
return true;
}
/** @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 {!./story-analytics.StoryAnalyticsService} */
this.analyticsService_ = getAnalyticsService(this.win, this.element);
/** @private @const {!AdvancementConfig} */
this.advancement_ = AdvancementConfig.forElement(this.win, this.element);
this.advancement_.start();
/** @const @private {!../../../src/service/vsync-impl.Vsync} */
this.vsync_ = this.getVsync();
/** @private @const {!SystemLayer} */
this.systemLayer_ = new SystemLayer(this.win, this.element);
/** Instantiate in case there are embedded components. */
new AmpStoryEmbeddedComponent(this.win, this.element);
/** @private {!Array<!./amp-story-page.AmpStoryPage>} */
this.pages_ = [];
/** @private @const {!Array<!./amp-story-page.AmpStoryPage>} */
this.adPages_ = [];
/** @const @private {!./variable-service.AmpStoryVariableService} */
this.variableService_ = getVariableService(this.win);
/** @private {?./amp-story-page.AmpStoryPage} */
this.activePage_ = null;
/** @private @const */
this.desktopOnePanelMedia_ = this.win.matchMedia(
`(min-aspect-ratio: ${DESKTOP_ONE_PANEL_ASPECT_RATIO_THRESHOLD})`
);
/** @private @const */
this.canRotateToDesktopMedia_ = this.win.matchMedia(
`(min-width: ${DESKTOP_HEIGHT_THRESHOLD}px) and ` +
`(min-height: ${DESKTOP_WIDTH_THRESHOLD}px)`
);
/** @private @const */
this.landscapeOrientationMedia_ = this.win.matchMedia(
'(orientation: landscape)'
);
/** @private {?HTMLMediaElement} */
this.backgroundAudioEl_ = null;
/** @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);
/** @private {?../../../src/service/viewer-interface.ViewerInterface} */
this.viewer_ = null;
/** @private {?AmpStoryViewerMessagingHandler} */
this.viewerMessagingHandler_ = null;
/**
* Store the current paused state, to make sure the story does not play on
* resume if it was previously paused. null when nothing to restore.
* @private {?boolean}
*/
this.pausedStateToRestore_ = null;
/** @private {?LiveStoryManager} */
this.liveStoryManager_ = null;
/** @private {?BackgroundBlur} */
this.backgroundBlur_ = null;
/** @private {?UIType_Enum} */
this.uiState_ = null;
/** @private {boolean} whether the styles were rewritten */
this.didRewriteStyles_ = false;
/**
* @private {?string} the page id to navigate to after receiving a granted state from amp-subscriptions
*/
this.pageAfterSubscriptionsGranted_ = null;
/** @private {!Deferred} a promise that is resolved once the subscription state is received */
this.subscriptionsStateDeferred_ = new Deferred();
/** @private {?number} the timeout to show subscriptions dialog after delay */
this.showSubscriptionsUITimeout_ = null;
/** @private {?number} the index of the page where the paywall would be triggered. */
this.subscriptionsPageIndex_ = -1;
/** @private {!Deferred} a promise that is resolved once the subscriptions page index is extracted from amp-story-subscriptions. */
this.subscriptionsPageIndexDeferred_ = new Deferred();
/**
* @private {?number} the index of the last page that should be shown in
* preview mode.
*/
this.indexOfLastPageToPreview_ = null;
}
/** @override */
buildCallback() {
this.viewer_ = Services.viewerForDoc(this.element);
const needsDvhPolyfill =
!this.win.CSS?.supports?.('height: 1dvh') &&
!getStyle(this.win.document.documentElement, '--story-dvh');
if (needsDvhPolyfill) {
this.polyfillDvh_(this.getViewport().getSize());
this.getViewport().onResize((size) => this.polyfillDvh_(size));
}
this.viewerMessagingHandler_ = this.viewer_.isEmbedded()
? new AmpStoryViewerMessagingHandler(this.win, this.viewer_)
: null;
this.indexOfLastPageToPreview_ = this.calculateIndexOfLastPageToPreview_();
this.installLocalizationStrings_();
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 pageId = this.getInitialPageId_();
if (pageId) {
const page = this.element.querySelector(
`amp-story-page#${escapeCssSelectorIdent(pageId)}`
);
page.setAttribute('active', '');
}
this.initializeListeners_();
this.initializePageIds_();
this.initializeStoryPlayer_();
this.uiState_ = this.getUIType_();
this.storeService_.dispatch(Action.TOGGLE_UI, this.uiState_);
if (this.isLandscapeSupported_()) {
this.win.document.documentElement.setAttribute(
'data-story-supports-landscape',
''
);
}
// Removes title in order to prevent incorrect titles appearing on link
// hover. (See 17654)
if (!this.platform_.isBot()) {
this.element.removeAttribute('title');
}
// Remove text nodes which would be shown outside of the amp-story
const textNodes = childNodes(
this.element,
(node) => node.nodeType === Node.TEXT_NODE
);
textNodes.forEach((node) => {
this.element.removeChild(node);
});
if (isExperimentOn(this.win, 'amp-story-branching')) {
this.registerAction('goToPage', (invocation) => {
const {args} = invocation;
if (!args) {
return;
}
this.storeService_.dispatch(
Action.SET_ADVANCEMENT_MODE,
AdvancementMode.GO_TO_PAGE
);
this.switchTo_(args['id'], NavigationDirection.NEXT);
});
}
const performanceService = Services.performanceFor(this.win);
if (
isExperimentOn(this.win, 'story-disable-animations-first-page') ||
isPreviewMode(this.win) ||
prefersReducedMotion(this.win) ||
isTransformed(this.getAmpDoc())
) {
performanceService.addEnabledExperiment(
'story-disable-animations-first-page'
);
}
const docElem = this.getAmpDoc().getRootNode().documentElement;
// [i-amphtml-version] marks that the style was inlined in the doc
// server-side.
const inlinedAmpStoryCssExists = docElem.querySelector(
'style[amp-extension="amp-story"][i-amphtml-version]'
);
// [amp-extension=amp-story] on a stylesheet link marks that the style
// was linked on the doc server-side.
const linkAmpStoryCssExists = docElem.querySelector(
'link[amp-extension="amp-story"][rel=stylesheet]'
);
if (inlinedAmpStoryCssExists) {
performanceService.addEnabledExperiment('story-inline-css');
} else if (linkAmpStoryCssExists) {
performanceService.addEnabledExperiment('story-link-css');
}
if (isExperimentOn(this.win, 'story-load-inactive-outside-viewport')) {
performanceService.addEnabledExperiment(
'story-load-inactive-outside-viewport'
);
this.element.classList.add(
'i-amphtml-experiment-story-load-inactive-outside-viewport'
);
}
if (this.maybeLoadStoryDevTools_()) {
return;
}
}
/**
* Pauses the whole story on viewer visibilityState updates, or tab visibility
* updates.
* @private
*/
pause_() {
this.setPausedStateToRestore_();
if (!this.storeService_.get(StateProperty.MUTED_STATE)) {
this.pauseBackgroundAudio_();
}
// If viewer has navigated to the next document, reset the active page.
if (
this.getAmpDoc().getVisibilityState() === VisibilityState_Enum.INACTIVE
) {
this.activePage_.setState(PageState.NOT_ACTIVE);
this.activePage_.element.setAttribute('active', '');
}
}
/**
* Resumes the whole story on viewer visibilityState updates, or tab
* visibility updates.
* @private
*/
resume_() {
this.restorePausedState_();
if (!this.storeService_.get(StateProperty.MUTED_STATE)) {
this.playBackgroundAudio_();
}
}
/** @private */
setPausedStateToRestore_() {
// Preserve if previously set. This method can be called several times when
// setting the visibilitystate to paused and then inactive.
if (this.pausedStateToRestore_ === null) {
this.pausedStateToRestore_ = !!this.storeService_.get(
StateProperty.PAUSED_STATE
);
}
this.storeService_.dispatch(Action.TOGGLE_PAUSED, true);
}
/** @private */
restorePausedState_() {
this.storeService_.dispatch(
Action.TOGGLE_PAUSED,
this.pausedStateToRestore_
);
this.pausedStateToRestore_ = null;
}
/**
* Note: runs in the buildCallback vsync mutate context.
* @private
*/
initializeStandaloneStory_() {
// Lock body to prevent overflow.
this.lockBody_();
// Standalone CSS affects sizing of the entire page.
this.onResizeDebounced();
}
/**
* Initializes page ids by deduplicating them.
* @private
*/
initializePageIds_() {
const pageEls = this.element.querySelectorAll('amp-story-page');
const pageIds = toArray(pageEls).map((el) => el.id || 'default-page');
const idsMap = map();
for (let i = 0; i < pageIds.length; i++) {
if (idsMap[pageIds[i]] === undefined) {
idsMap[pageIds[i]] = 0;
continue;
}
user().error(TAG, `Duplicate amp-story-page ID ${pageIds[i]}`);
const newId = `${pageIds[i]}__${++idsMap[pageIds[i]]}`;
pageEls[i].id = newId;
pageIds[i] = newId;
}
this.storeService_.dispatch(Action.SET_PAGE_IDS, pageIds);
}
/**
* @private
*/
rewriteStyles_() {
// TODO(#15955): Update this to use CssContext from
// ../../../extensions/amp-animation/0.1/web-animations.js
if (this.didRewriteStyles_) {
return;
}
this.didRewriteStyles_ = true;
const styleEl = this.win.document.querySelector('style[amp-custom]');
if (styleEl) {
styleEl.textContent = styleEl.textContent.replace(
/(-?[\d.]+)v(w|h|min|max)/gim,
'calc($1 * var(--story-page-v$2))'
);
}
}
/**
* @private
*/
setThemeColor_() {
// Don't override the publisher's tag.
if (this.win.document.querySelector('meta[name=theme-color]')) {
return;
}
// The theme color should be copied from the story's primary accent color
// if possible, with the fall back being default dark gray.
const meta = this.win.document.createElement('meta');
const ampStoryPageEl = this.element.querySelector('amp-story-page');
meta.name = 'theme-color';
meta.content =
computedStyle(this.win, this.element).getPropertyValue(
'--primary-color'
) ||
computedStyle(
this.win,
dev().assertElement(ampStoryPageEl)
).getPropertyValue('background-color') ||
DEFAULT_THEME_COLOR;
this.win.document.head.appendChild(meta);
}
/**
* Builds the system layer DOM.
* @param {string} initialPageId
* @param {boolean} isVisible
* @private
*/
buildSystemLayer_(initialPageId, isVisible) {
this.updateAudioIcon_();
this.updatePausedIcon_();
this.element.appendChild(this.systemLayer_.build(initialPageId, isVisible));
}
/** @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_.onVariableUpdate(
AnalyticsVariable.STORY_IS_MUTED,
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.analyticsService_.triggerEvent(
isMuted
? StoryAnalyticsEvent.STORY_MUTED
: StoryAnalyticsEvent.STORY_UNMUTED
);
},
false /** callToInitialize */
);
this.storeService_.subscribe(StateProperty.ADVANCEMENT_MODE, (mode) => {
this.variableService_.onVariableUpdate(
AnalyticsVariable.STORY_ADVANCEMENT_MODE,
mode
);
});
this.storeService_.subscribe(
StateProperty.CAN_SHOW_AUDIO_UI,
(show) => {
this.element.classList.toggle('i-amphtml-story-no-audio-ui', !show);
},
true /** callToInitialize */
);
this.element.addEventListener(EventType.SWITCH_PAGE, (e) => {
// SWITCH_PAGE is fired with each page advancement in preview mode.
// Before advancing beyond the final page of a preview, we send the
// viewer a message that the preview has finished. In the SERP, this
// message can be used to advance to a subsequent story's preview.
if (this.getAmpDoc().isPreview()) {
this.sendMessageIfPreviewFinished_();
}
this.switchTo_(getDetail(e)['targetPageId'], getDetail(e)['direction']);
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;
}
const storyAdSegmentBranch = getExperimentBranch(
this.win,
StoryAdSegmentExp.ID
);
if (
!this.activePage_.isAd() ||
(storyAdSegmentBranch &&
storyAdSegmentBranch != StoryAdSegmentExp.CONTROL)
) {
this.systemLayer_.updateProgress(pageId, progress);
}
});
this.element.addEventListener(EventType.REPLAY, () => {
this.replay_();
});
this.element.addEventListener(EventType.NO_NEXT_PAGE, () => {
this.onNoNextPage_();
});
this.element.addEventListener(EventType.NO_PREVIOUS_PAGE, () => {
this.onNoPreviousPage_();
});
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 allowlist could be initialized empty, or with some actions some
// other components registered.
this.storeService_.subscribe(
StateProperty.ACTIONS_ALLOWLIST,
(actionsAllowlist) => {
const actions = Services.actionServiceForDoc(this.element);
actions.setAllowlist(actionsAllowlist);
},
true /** callToInitialize */
);
this.storeService_.subscribe(StateProperty.AD_STATE, (isAd) => {
this.onAdStateUpdate_(isAd);
});
this.storeService_.subscribe(StateProperty.PAUSED_STATE, (isPaused) => {
this.onPausedStateUpdate_(isPaused);
});
this.storeService_.subscribe(
StateProperty.UI_STATE,
(uiState) => {
this.onUIStateUpdate_(uiState);
},
true /** callToInitialize */
);
this.storeService_.subscribe(
StateProperty.SUBSCRIPTIONS_PAGE_INDEX,
(subscriptionsPageIndex) => {
if (subscriptionsPageIndex !== -1) {
this.subscriptionsPageIndexDeferred_.resolve();
this.subscriptionsPageIndex_ = subscriptionsPageIndex;
}
},
true
);
this.storeService_.subscribe(
StateProperty.SUBSCRIPTIONS_STATE,
(subscriptionsState) => {
if (subscriptionsState === SubscriptionsState.PENDING) {
return;
}
this.subscriptionsStateDeferred_.resolve();
if (subscriptionsState === SubscriptionsState.GRANTED) {
this.hideSubscriptionsDialog_();
}
}
);
this.storeService_.subscribe(
StateProperty.SUBSCRIPTIONS_DIALOG_UI_STATE,
(dialogState) => {
if (!dialogState) {
this.onHideSubscriptionsDialog_();
}
}
);
this.win.document.addEventListener(
'keydown',
(e) => {
this.onKeyDown_(e);
},
true
);
this.win.document.addEventListener('contextmenu', (e) => {
const uiState = this.storeService_.get(StateProperty.UI_STATE);
if (uiState === UIType_Enum.MOBILE) {
if (!this.allowContextMenuOnMobile_(e.target)) {
e.preventDefault();
}
e.stopPropagation();
}
});
this.getAmpDoc().onVisibilityChanged(() => this.onVisibilityChanged_());
this.win.addEventListener('hashchange', () => {
const maybePageId = parseQueryString(this.win.location.hash)['page'];
if (!maybePageId || !this.isActualPage_(maybePageId)) {
return;
}
this.switchTo_(maybePageId, NavigationDirection.NEXT);
// Removes the page 'hash' parameter from the URL.
let href = this.win.location.href.replace(
new RegExp(`page=${maybePageId}&?`),
''
);
if (endsWith(href, '#')) {
href = href.slice(0, -1);
}
this.win.history.replaceState(
(this.win.history && getWindowHistoryState(this.win.history)) ||
{} /** data */,
this.win.document.title /** title */,
href /** URL */
);
});
// Listen for class mutations on the <body> element.
const bodyElObserver = new this.win.MutationObserver((mutations) =>
this.onBodyElMutation_(mutations)
);
bodyElObserver.observe(this.win.document.body, {
attributes: true,
attributeFilter: ['class'],
});
this.getViewport().onResize(
debounce(this.win, () => this.onResizeDebounced(), 300)
);
this.installGestureRecognizers_();
// TODO(gmajoulet): migrate this to amp-story-viewer-messaging-handler once
// there is a way to navigate to pages that does not involve using private
// amp-story methods.
this.viewer_.onMessage('selectPage', (data) => this.onSelectPage_(data));
this.viewer_.onMessage('rewind', () => this.onRewind_());
if (this.viewerMessagingHandler_) {
this.viewerMessagingHandler_.startListening();
}
new AmpStoryShare(this.win, this.element);
}
/**
* @param {MutationRecord} mutations
* @private
*/
onBodyElMutation_(mutations) {
mutations.forEach((mutation) => {
const bodyEl = dev().assertElement(mutation.target);
// Updates presence of the `amp-mode-keyboard-active` class on the store.
this.storeService_.dispatch(
Action.TOGGLE_KEYBOARD_ACTIVE_STATE,
bodyEl.classList.contains('amp-mode-keyboard-active')
);
});
}
/** @private */
installGestureRecognizers_() {
// If the story is within a viewer that enabled the swipe capability, this
// disables the navigation education overlay to enable:
// - horizontal swipe events to the next story
// - vertical swipe events to close the viewer, or open a page attachment
if (this.viewer_.hasCapability('swipe')) {
return;
}
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;
const embedComponent = /** @type {InteractiveComponentDef} */ (
this.storeService_.get(StateProperty.INTERACTIVE_COMPONENT_STATE)
);
// TODO(enriqe): Move to a separate file if this keeps growing.
if (
embedComponent.state !== EmbeddedComponentState.HIDDEN ||
!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.
if (gesture.event && gesture.event.cancelable !== false) {
gesture.event.preventDefault();
}
return;
}
if (
(gesture.event && 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 */
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 orientationWarning = (e) =>
dev().warn(TAG, 'Failed to lock screen orientation:', e.message);
// Returns a promise.
const lockOrientationPromise = screen.orientation?.lock;
if (lockOrientationPromise) {
lockOrientationPromise('portrait').catch(orientationWarning);
return;
}
// Returns boolean or undefined.
const lockOrientation =
screen.lockOrientation ||
screen.mozLockOrientation ||
screen.msLockOrientation ||
((unusedOrientation) => {});
try {
lockOrientation('portrait');
} catch (e) {
orientationWarning(e);
}
}
/** @override */
layoutCallback() {
if (!AmpStory.isBrowserSupported(this.win) && !this.platform_.isBot()) {
return this.displayUnsupportedBrowser_();
}
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 initialPageId = this.getInitialPageId_();
const shouldShowSystemLayer =
this.viewer_.getParam('hideProgressBar') !== '1';
if (!shouldShowSystemLayer) {
// The default value of `SYSTEM_UI_IS_VISIBLE_STATE` is `true`. We set it
// to `false` here solely to ensure that a subsequent firing of the
// `TOGGLE_SYSTEM_UI_IS_VISIBLE` action with a `true` value registers as
// a change in state instead of being a no-op.
this.storeService_.dispatch(Action.TOGGLE_SYSTEM_UI_IS_VISIBLE, false);
}
this.buildSystemLayer_(initialPageId, shouldShowSystemLayer);
this.setThemeColor_();
const storyLayoutPromise = Promise.all([
this.initializePages_(),
// Pauses execution during prerender.
this.getAmpDoc().whenFirstPreviewedOrVisible(),
])
.then(() => {
this.handleConsentExtension_();
this.pages_.forEach((page, index) => {
page.setState(PageState.NOT_ACTIVE);
this.upgradeCtaAnchorTagsForTracking_(page, index);
});
this.initializeStoryNavigationPath_();
// Build pagination buttons if they can be displayed.