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amp-video-docking.js
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amp-video-docking.js
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/**
* Copyright 2018 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.
*/
import {ActionTrust} from '../../../src/action-constants';
import {CSS} from '../../../build/amp-video-docking-0.1.css';
import {Controls} from './controls';
import {HtmlLiteralTagDef} from './html';
import {
PlayingStates,
VideoAttributes,
VideoEvents,
isDockable,
} from '../../../src/video-interface';
import {
PositionObserver, // eslint-disable-line no-unused-vars
installPositionObserverServiceForDoc,
} from '../../../src/service/position-observer/position-observer-impl';
import {
PositionObserverFidelity,
} from '../../../src/service/position-observer/position-observer-worker';
import {Services} from '../../../src/services';
import {VideoDockingEvents, pointerCoords} from './events';
import {applyBreakpointClassname} from './breakpoints';
import {calculateLeftJustifiedX, calculateRightJustifiedX} from './math';
import {
createCustomEvent,
listen,
listenOnce,
} from '../../../src/event-helper';
import {dev, devAssert, user, userAssert} from '../../../src/log';
import {dict} from '../../../src/utils/object';
import {
escapeCssSelectorIdent,
isRTL,
removeElement,
scopedQuerySelector,
} from '../../../src/dom';
import {getInternalVideoElementFor} from '../../../src/utils/video';
import {getServiceForDoc} from '../../../src/service';
import {htmlFor, htmlRefs} from '../../../src/static-template';
import {installStylesForDoc} from '../../../src/style-installer';
import {isFiniteNumber} from '../../../src/types';
import {layoutRectLtwh, moveLayoutRect} from '../../../src/layout-rect';
import {mapRange} from '../../../src/utils/math';
import {once} from '../../../src/utils/function';
import {
px,
resetStyles,
setImportantStyles,
setStyles,
toggle,
} from '../../../src/style';
const TAG = 'amp-video-docking';
/** @visibleForTesting @const {number} */
export const MARGIN_MAX = 30;
/** @visibleForTesting @const {number} */
export const MARGIN_AREA_WIDTH_PERC = 0.04;
/** @visibleForTesting @const {number} */
export const MIN_WIDTH = 180;
/** @private @const {number} */
const MIN_VIEWPORT_WIDTH = 320;
/** @private @const {number} */
const FLOAT_TOLERANCE = 0.02;
/** @visibleForTesting @const {string} */
export const BASE_CLASS_NAME = 'i-amphtml-video-docked';
/** @visibleForTesting @const {number} */
export const REVERT_TO_INLINE_RATIO = 0.7;
/** @enum */
export const RelativeX = {LEFT: 0, RIGHT: 1};
/** @enum */
export const RelativeY = {TOP: 0, BOTTOM: 1};
/** @enum */
export const Direction = {UP: 1, DOWN: -1};
/** @enum {string} */
export const Actions = {DOCK: 'dock', UNDOCK: 'undock'};
/** @visibleForTesting */
export const DOCKED_TO_CORNER_SIZING_RATIO = 0.3;
/**
* @struct @typedef {{
* video: !../../../src/video-interface.VideoOrBaseElementDef,
* target: !DockTargetDef,
* step: number,
* }}
*/
let DockedDef;
/** @typedef {{posX: !RelativeX, posY: !RelativeY}|!Element} */
let DockTargetDef;
/**
* @param {number} x
* @param {number} y
* @param {number} scale
* @return {string}
*/
const transform = (x, y, scale) => `translate(${x}px, ${y}px) scale(${scale})`;
/**
* @param {!Window} win
* @param {function(...*)} fn
* @return {function(...*)}
*/
function throttleByAnimationFrame(win, fn) {
let running = false;
return (...args) => {
if (running) {
return;
}
running = true;
win.requestAnimationFrame(() => {
fn.apply(null, args);
running = false;
});
};
}
/**
* Maps an interpolation step in [0..1] to its position in a range.
* @param {number} step
* @param {number} min
* @param {number} max
* @return {number}
*/
function mapStep(step, min, max) {
return mapRange(step, 0, 1, min, max);
}
/**
* @param {!Element} element
* @restricted
*/
function complainAboutPortrait(element) {
// Constant named `TAG` per lint rules.
const TAG = element.tagName.toUpperCase();
user().error(TAG,
'Minimize-to-corner (`dock`) does not support portrait video.',
element);
}
// Function should ideally be in `dom.js`, but moving it causes a bunch of ads
// tests to fail, for some reason.
// TODO(alanorozco): Move.
/**
* @param {!Object} obj
* @return {boolean}
*/
export function isElement(obj) {
return obj.nodeType == /* ELEMENT */ 1;
}
/**
* @param {!HtmlLiteralTagDef} html
* @return {!Element}
* @private
*/
const ShadowLayer = html =>
html`<div class="amp-video-docked-shadow" hidden></div>`;
/**
* @param {!HtmlLiteralTagDef} html
* @return {!Element}
* @private
*/
const PlaceholderBackground = html =>
html`<div class="amp-video-docked-placeholder-background">
<div class="amp-video-docked-placeholder-background-poster"
ref="poster">
</div>
<div class="amp-video-docked-placeholder-icon"
ref="icon">
</div>
</div>`;
/** @visibleForTesting @const {!Array<!./breakpoints.SyntheticBreakpointDef>} */
export const PLACEHOLDER_ICON_BREAKPOINTS = [
{
className: 'amp-small',
minWidth: 0,
},
{
className: 'amp-large',
minWidth: 420,
},
];
/** @visibleForTesting */
export const PLACEHOLDER_ICON_LARGE_WIDTH = 48;
/** @visibleForTesting */
export const PLACEHOLDER_ICON_LARGE_MARGIN = 40;
/** @visibleForTesting */
export const PLACEHOLDER_ICON_SMALL_WIDTH = 32;
/** @visibleForTesting */
export const PLACEHOLDER_ICON_SMALL_MARGIN = 20;
/**
* @param {!Element} element
* @return {!../../../src/layout-rect.LayoutRectDef}
*/
function getIntersectionRect(element) {
return /** @type {!../../../src/layout-rect.LayoutRectDef} */ (
element.getIntersectionChangeEntry().intersectionRect);
}
/**
* @param {!../../../src/layout-rect.LayoutRectDef} rect
* @return {boolean}
*/
function isSizedLayoutRect({width, height}) {
return width > 0 && height > 0;
}
/**
* @param {!DockTargetDef} a
* @param {!DockTargetDef} b
* @return {boolean}
*/
function targetsEqual(a, b) {
if (isElement(a)) {
return a == b;
}
return a.posX == b.posX;
}
/**
* Manages docking (a.k.a. minimize to corner) for videos that satisfy the
* {@see ../../../src/video-interface.VideoInterface}.
* @visibleForTesting
*/
export class VideoDocking {
/**
* @param {!../../../src/service/ampdoc-impl.AmpDoc} ampdoc
* @param {!PositionObserver=} opt_injectedPositionObserver
*/
constructor(ampdoc, opt_injectedPositionObserver) {
/** @private @const {!../../../src/service/ampdoc-impl.AmpDoc} */
this.ampdoc_ = ampdoc;
/** @private @const */
this.manager_ = once(() => Services.videoManagerForDoc(ampdoc));
/**
* @private
* @const {!../../../src/service/viewport/viewport-impl.Viewport}
*/
this.viewport_ = Services.viewportForDoc(ampdoc);
/** @private {?DockedDef} */
this.currentlyDocked_ = null;
/**
* Overriden when user drags the video to a corner.
* Y-corner is determined based on scroll direction.
* @private {!RelativeX}
*/
this.preferredCornerX_ =
isRTL(this.getDoc_()) ? RelativeX.LEFT : RelativeX.RIGHT;
const html = htmlFor(this.getDoc_());
/**
* Returns an element representing a shadow under the docked video.
* Alternatively, we could use box-shadow on the video element, but in
* order to animate it without jank we have to use an opacity transition.
* A separate layer also has the added benefit that authors can override its
* box-shadow value or any other styling without handling the transition
* themselves.
* @private @const {function():!Element}
*/
this.getShadowLayer_ = once(() => this.append_(ShadowLayer(html)));
/** @private @const {function():!Controls} */
this.getControls_ = once(() => this.installControls_());
/** @private @const {function():!Element} */
this.getPlaceholderBackground_ =
once(() => this.append_(PlaceholderBackground(html)));
/** @private @const {function():!Object<string, !Element>} */
this.getPlaceholderRefs_ =
once(() => htmlRefs(this.getPlaceholderBackground_()));
/** @private {?../../../src/video-interface.VideoOrBaseElementDef} */
this.lastDismissed_ = null;
/** @private {?RelativeY} */
this.lastDismissedPosY_ = null;
/**
* Memoizes x, y and scale to prevent useless mutations.
* @private {?{x: number, y: number, scale: number}}
*/
this.placedAt_ = null;
/** @private {?{width: number, height: number}} */
this.sizedAt_ = null;
/** @private {?Direction} */
this.scrollDirection_ = null;
/** @private {number} */
this.lastScrollTop_ = this.viewport_.getScrollTop();
/** @private {boolean} */
this.isDragging_ = false;
/** @private {number} */
this.previousDragOffsetX_ = 0;
/** @private {number} */
this.dragVelocityX_ = 0;
/** @private {!Array<!../../../src/video-interface.VideoOrBaseElementDef>} */
this.observed_ = [];
/**
* Lazily invoked.
* @private @const {!function()}
*/
this.install_ = once(() => {
const ampdoc = this.ampdoc_;
this.viewport_.onScroll(
throttleByAnimationFrame(ampdoc.win, () => this.updateScroll_()));
this.viewport_.onResize(() => this.updateAllOnResize_());
installStylesForDoc(ampdoc, CSS, /* callback */ null,
/* isRuntimeCss */ false, TAG);
});
/** @private @const {function():?Element} */
this.getSlot_ = once(() => this.querySlot_());
/** @private @const {?PositionObserver} */
this.injectedPositionObserver_ = opt_injectedPositionObserver || null;
/** @private {boolean} */
this.isTransitioning_ = false;
this.registerAll_();
}
/** @private */
registerAll_() {
const ampdoc = this.ampdoc_;
const dockableSelector =
`[${escapeCssSelectorIdent(VideoAttributes.DOCK)}]`;
const dockableElements =
ampdoc.getRootNode().querySelectorAll(dockableSelector);
for (let i = 0; i < dockableElements.length; i++) {
const element = dockableElements[i];
if (element.signals &&
element.signals().get(VideoEvents.REGISTERED)) {
this.registerElement(element);
}
}
listen(ampdoc.getBody(), VideoEvents.REGISTERED, e => {
const target = dev().assertElement(e.target);
if (isDockable(target)) {
this.registerElement(target);
}
});
}
/**
* @return {?Element}
* @private
*/
querySlot_() {
const root = this.ampdoc_.getRootNode();
// For consistency always honor the dock attribute on the first el in page.
const video = root.querySelector('[dock]');
dev().assertElement(video);
userAssert(video.signals().get(VideoEvents.REGISTERED),
'`dock` attribute can only be set on video components.');
const slotSelector = video.getAttribute('dock').trim();
if (slotSelector == '') {
return null;
}
const el = root.querySelector(slotSelector);
if (el) {
userAssert(el.tagName.toLowerCase() == 'amp-layout',
'Dock slot must be an <amp-layout> element.');
}
return el;
}
/** @private */
updateAllOnResize_() {
this.observed_.forEach(video => this.updateOnResize_(video));
}
/** @param {!../../../src/video-interface.VideoOrBaseElementDef} video */
register(video) {
this.install_();
const {element} = video;
const fidelity = PositionObserverFidelity.HIGH;
this.getPositionObserver_().observe(element, fidelity,
() => this.updateOnPositionChange_(video));
this.observed_.push(video);
}
/**
* @param {!Element} element
* @public
*/
registerElement(element) {
element.getImpl().then(video => this.register(video));
}
/** @private */
updateScroll_() {
const scrollTop = this.viewport_.getScrollTop();
// debounce
if (Math.abs(scrollTop - this.lastScrollTop_) < 5) {
return;
}
const scrollDirection = scrollTop > this.lastScrollTop_ ?
Direction.UP :
Direction.DOWN;
this.scrollDirection_ = scrollDirection;
this.lastScrollTop_ = scrollTop;
}
/**
* @return {!Document}
* @private
*/
getDoc_() {
return /** @type {!Document} */ (this.ampdoc_.getRootNode());
}
/**
* @param {!Element} element
* @return {!Element}
* @private
*/
append_(element) {
const root = this.getDoc_().body || this.getDoc_();
return dev().assertElement(root.appendChild(element));
}
/**
* @param {!Element} element
* @return {!Element}
* @private
*/
addDragListeners_(element) {
const handler = e => this.drag_(/** @type {!TouchEvent} */(e));
listen(element, 'touchstart', handler);
listen(element, 'mousedown', handler);
return element;
}
/**
* @return {!Controls}
* @private
*/
installControls_() {
const controls = new Controls(this.ampdoc_);
const {container, overlay} = controls;
listen(container, VideoDockingEvents.DISMISS_ON_TAP, () => {
this.dismissOnTap_();
});
this.addDragListeners_(container);
this.addDragListeners_(overlay);
this.append_(container);
this.append_(overlay);
return controls;
}
/** @private */
dismissOnTap_() {
this.getControls_().hide(/* respectSticky */ false, /* immediately */ true);
this.undock_(this.getDockedVideo_());
}
/**
* @return {!../../../src/video-interface.VideoOrBaseElementDef}
* @private
*/
getDockedVideo_() {
return devAssert(this.currentlyDocked_).video;
}
/**
* @return {!PositionObserver}
* @private
*/
getPositionObserver_() {
// for testing
if (this.injectedPositionObserver_) {
return this.injectedPositionObserver_;
}
installPositionObserverServiceForDoc(this.ampdoc_);
// No getter in services.js.
return /** @type {!PositionObserver} */ (
getServiceForDoc(this.ampdoc_, 'position-observer'));
}
/**
* Reconciles the state of a docked or potentially dockable video when
* the viewport/position changes.
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @return {?DockTargetDef}
* @private
*/
getTargetFor_(video) {
if (this.isDragging_ ||
!this.isValidSize_(video) ||
this.ignoreBecauseAnotherDocked_(video) ||
this.ignoreDueToNotPlayingManually_(video)) {
return null;
}
if (this.canUpdateFromSlot_(video)) {
return this.getSlot_();
}
const posY = this.maybeGetRelativeY_(video);
if (posY === null) {
return posY;
}
return {posY, posX: this.getRelativeX_()};
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @return {boolean}
* @private
*/
canUpdateFromSlot_(video) {
if (!this.slotHasDimensions_()) {
return false;
}
const relativeY = this.getSlotRelativeY_();
const {element} = video;
const intersectionRect = getIntersectionRect(element);
if (!isSizedLayoutRect(intersectionRect)) {
return false;
}
const {top, bottom} = intersectionRect;
const {top: slotTop, height: slotHeight} = this.getFixedSlotLayoutBox_();
const slotBottom = this.viewport_.getSize().height - slotHeight - slotTop;
if (relativeY == RelativeY.TOP) {
return top <= slotTop;
}
return bottom >= slotBottom;
}
/**
* @return {!../../../src/layout-rect.LayoutRectDef}
* @private
*/
getFixedSlotLayoutBox_() {
return this.getFixedLayoutBox_(dev().assertElement(this.getSlot_()));
}
/**
* @param {!Element} element
* @return {!../../../src/layout-rect.LayoutRectDef}
* @private
*/
getFixedLayoutBox_(element) {
const dy = -this.viewport_.getScrollTop();
return moveLayoutRect(element.getLayoutBox(), /* dx */ 0, dy);
}
/**
* @return {boolean}
* @private
*/
slotHasDimensions_() {
const el = this.getSlot_();
if (!el) {
return false;
}
const {width, height} = this.getFixedSlotLayoutBox_();
return width > 0 && height > 0;
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @private
*/
updateOnResize_(video) {
// Update on subsequent animation frame to allow CSS media queries to be
// applied.
this.raf_(() => {
const target = this.getTargetFor_(video);
if (target) {
this.dock_(video, target, /* step */ 1);
return;
}
if (this.isCurrentlyDocked_(video)) {
this.undock_(video);
}
});
}
/**
* @param {function()} cb
* @private
*/
raf_(cb) {
this.ampdoc_.win.requestAnimationFrame(cb);
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @private
*/
updateOnPositionChange_(video) {
if (this.isTransitioning_) {
return;
}
if (this.scrollDirection_ == Direction.UP) {
const target = this.getTargetFor_(video);
if (target) {
this.dockOnPositionChange_(video, target);
}
} else if (this.scrollDirection_ == Direction.DOWN) {
if (!this.currentlyDocked_) {
return;
}
const video = this.getDockedVideo_();
if (this.isVisible_(video.element, REVERT_TO_INLINE_RATIO)) {
this.undock_(video);
}
}
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @return {boolean}
*/
ignoreDueToNotPlayingManually_(video) {
return !this.currentlyDocked_ && !this.isPlaying_(video);
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @return {boolean}
*/
ignoreBecauseAnotherDocked_(video) {
return !!this.currentlyDocked_ && !this.isCurrentlyDocked_(video);
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @return {boolean}
* @private
*/
isValidSize_(video) {
const {width, height} = video.getLayoutBox();
if ((width / height) < (1 - FLOAT_TOLERANCE)) {
complainAboutPortrait(video.element);
return false;
}
return this.getAreaWidth_() >= MIN_VIEWPORT_WIDTH &&
this.getAreaHeight_() >= (height * REVERT_TO_INLINE_RATIO);
}
/**
* @return {number}
* @private
*/
getTopEdge_() {
return 0;
}
/**
* @return {number}
* @private
*/
getBottomEdge_() {
return this.viewport_.getSize().height;
}
/**
* @return {number}
* @private
*/
getLeftEdge_() {
return 0;
}
/**
* @return {number}
* @private
*/
getRightEdge_() {
return this.viewport_.getSize().width;
}
/**
* @return {!RelativeX}
* @private
*/
getRelativeX_() {
return this.preferredCornerX_;
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @return {?RelativeY}
* @private
*/
maybeGetRelativeY_(video) {
if (this.slotHasDimensions_()) {
return null;
}
if (this.isCurrentlyDocked_(video) &&
!isElement(this.currentlyDocked_.target)) {
const {posY} = devAssert(this.currentlyDocked_).target;
return /** @type {!RelativeY} */ (dev().assertNumber(posY));
}
const {element} = video;
const intersectionRect = getIntersectionRect(element);
if (!isSizedLayoutRect(intersectionRect) ||
intersectionRect.top > this.getTopEdge_()) {
return null;
}
dev().info(TAG, 'should dock at Y = TOP', {video, intersectionRect});
return RelativeY.TOP;
}
/**
* @return {number}
* @private
*/
getMargin_() {
return Math.min(MARGIN_MAX, MARGIN_AREA_WIDTH_PERC * this.getAreaWidth_());
}
/**
* @return {number}
* @private
*/
getAreaWidth_() {
return this.getRightEdge_() - this.getLeftEdge_();
}
/**
* @return {number}
* @private
*/
getAreaHeight_() {
return this.getBottomEdge_() - this.getTopEdge_();
}
/**
* @param {?../../../src/video-interface.VideoOrBaseElementDef} optVideo
* @return {boolean}
* @private
*/
isPlaying_(optVideo = null) {
const video = /** @type {!../../../src/video-interface.VideoInterface} */ (
optVideo || this.getDockedVideo_());
return this.manager_().getPlayingState(video) ==
PlayingStates.PLAYING_MANUAL;
}
/**
* @return {!RelativeY}
* @private
*/
getSlotRelativeY_() {
const {top, height} = this.getFixedSlotLayoutBox_();
const vh = this.viewport_.getSize().height;
const bottom = vh - height - top;
return bottom > top ? RelativeY.TOP : RelativeY.BOTTOM;
}
/**
* @param {!RelativeY} posY
* @return {boolean}
* @private
*/
positionMatchesScroll_(posY) {
const direction = this.scrollDirection_;
return (
(posY == RelativeY.TOP && direction == Direction.UP) ||
(posY == RelativeY.BOTTOM && direction == Direction.DOWN));
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @param {!DockTargetDef} target
* @private
*/
dockOnPositionChange_(video, target) {
if (this.ignoreDueToDismissal_(video)) {
return;
}
if (this.currentlyDocked_) {
return;
}
const currentlyDocked = this.currentlyDocked_;
if (currentlyDocked &&
targetsEqual(target, currentlyDocked.target) &&
currentlyDocked.step >= 0) {
return;
}
this.dockInTransferLayerStep_(video, target);
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @param {!DockTargetDef} target
* @param {number=} opt_step
* @private
*/
dockInTransferLayerStep_(video, target, opt_step) {
// Do this in a multi-step process due to a browser quirk in transferring
// layers to GPU.
const step = opt_step || 0.1;
// This cutoff is arbitrary and may be dependant on performance.
// TODO(alanorozco): Investigate.
if (step > 0.3) {
return this.dock_(video, target, /* step */ 1);
}
const isTransferLayerStep = true;
return this.dock_(video, target, step, isTransferLayerStep).then(() =>
new Promise(resolve => {
this.raf_(() => {
this.dockInTransferLayerStep_(video, target, step + 0.1)
.then(resolve);
});
}));
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @param {!DockTargetDef} target
* @param {number} step
* @param {boolean=} opt_isTransferLayerStep
* @return {!Promise}
* @private
*/
dock_(video, target, step, opt_isTransferLayerStep) {
dev().info(TAG, 'dock', {video, target, step});
const {element} = video;
// Component background is now visible, so hide the poster for the Android
// workaround so authors can style the component container as they like.
// (see `AmpVideo#createPosterForAndroidBug_`).
// TODO(alanorozco): Make docking agnostic to this workaround.
this.removePosterForAndroidBug_(element);
const {x, y, scale, relativeX} = this.getDims_(video, target, step);
video.hideControls();
const transitionDurationMs = this.calculateTransitionDuration_(step);
this.setCurrentlyDocked_(video, target, step);
return this.placeAt_(
video, x, y, scale, step, transitionDurationMs, relativeX)
.then(() => {
if (opt_isTransferLayerStep) {
// Do not enable controls during transfer layer steps, which would
// make them appear on hover during transition.
return;
}
this.getControls_().enable();
});
}
/**
* @param {!Actions} action
* @private
*/
trigger_(action) {
const element = dev().assertElement(
this.isDockedToSlot_()
? this.getSlot_()
: this.getDockedVideo_().element
);
const trust = ActionTrust.LOW;
const event = createCustomEvent(this.ampdoc_.win,
/** @type {string} */ (action), /* detail */ dict({}));
const actions = Services.actionServiceForDoc(element);
actions.trigger(element, action, event, trust);
}
/**
* @param {!../../../src/video-interface.VideoOrBaseElementDef} video
* @return {boolean}
* @private
*/
ignoreDueToDismissal_(video) {
if (this.lastDismissed_ != video) {
return false;
}
if (this.lastDismissedPosY_ !== null &&
!this.positionMatchesScroll_(this.lastDismissedPosY_)) {
return false;
}
if (this.isVisible_(video.element, FLOAT_TOLERANCE)) {
this.resetDismissed_();
}
return true;
}
/** @private */
resetDismissed_() {
this.lastDismissed_ = null;
this.lastDismissedPosY_ = null;
}
/**
* @param {!AmpElement} element
* @param {?DockTargetDef=} target
* @return {number}
* @private
*/
calculateIntersectionRatio_(element, target = null) {
if (target == null || !isElement(target)) {
return element.getIntersectionChangeEntry().intersectionRatio;
}
const layoutBox = element.getLayoutBox();
const {top, bottom, height} = layoutBox;