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visibility-manager.js
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visibility-manager.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.
*/
import {Services} from '../../../src/services';
import {VisibilityModel} from './visibility-model';
import {_GOOGLE_ACTIVEVIEW_ERROR_STATE_NAME} from './requests';
import {dev, user} from '../../../src/log';
import {dict, map} from '../../../src/utils/object';
import {getFriendlyIframeEmbedOptional} from '../../../src/iframe-helper';
import {getMinOpacity} from './opacity';
import {getMode} from '../../../src/mode';
import {getParentWindowFrameElement} from '../../../src/service';
import {isArray, isFiniteNumber} from '../../../src/types';
import {
layoutPositionRelativeToScrolledViewport,
layoutRectLtwh,
} from '../../../src/layout-rect';
import {rootNodeFor} from '../../../src/dom';
const TAG = 'amp-analytics/visibility-manager';
const PROP = '__AMP_VIS';
const VISIBILITY_ID_PROP = '__AMP_VIS_ID';
export const DEFAULT_THRESHOLD = [
0,
0.05,
0.1,
0.15,
0.2,
0.25,
0.3,
0.35,
0.4,
0.45,
0.5,
0.55,
0.6,
0.65,
0.7,
0.75,
0.8,
0.85,
0.9,
0.95,
1,
];
/** @type {number} */
let visibilityIdCounter = 1;
/**
* @param {!Element} element
* @return {number}
*/
function getElementId(element) {
let id = element[VISIBILITY_ID_PROP];
if (!id) {
id = ++visibilityIdCounter;
element[VISIBILITY_ID_PROP] = id;
}
return id;
}
/**
* @param {!Node} rootNode
* @return {!VisibilityManager}
*/
export function provideVisibilityManager(rootNode) {
if (!rootNode[PROP]) {
rootNode[PROP] = createVisibilityManager(rootNode);
}
return rootNode[PROP];
}
/**
* @param {!Node} rootNode
* @return {!VisibilityManager}
*/
function createVisibilityManager(rootNode) {
// TODO(#22733): cleanup when ampdoc-fie is launched.
const ampdoc = Services.ampdoc(rootNode);
const frame = getParentWindowFrameElement(rootNode);
const embed = frame && getFriendlyIframeEmbedOptional(frame);
const frameRootNode = frame && rootNodeFor(frame);
if (embed && frameRootNode) {
return new VisibilityManagerForEmbed(
provideVisibilityManager(frameRootNode),
embed
);
}
return new VisibilityManagerForDoc(ampdoc);
}
/**
* A base class for `VisibilityManagerForDoc` and `VisibilityManagerForEmbed`.
* The instance of this class corresponds 1:1 to `AnalyticsRoot`. It represents
* a collection of all visibility triggers declared within the `AnalyticsRoot`.
* @implements {../../../src/service.Disposable}
* @abstract
*/
export class VisibilityManager {
/**
* @param {?VisibilityManager} parent
* @param {!../../../src/service/ampdoc-impl.AmpDoc} ampdoc
*/
constructor(parent, ampdoc) {
/** @const @protected */
this.parent = parent;
/** @const @protected */
this.ampdoc = ampdoc;
/** @const @private */
this.resources_ = Services.resourcesForDoc(ampdoc);
/** @private {number} */
this.rootVisibility_ = 0;
/** @const @private {!Array<!VisibilityModel>}> */
this.models_ = [];
/** @private {?Array<!VisibilityManager>} */
this.children_ = null;
/** @const @private {!Array<!UnlistenDef>} */
this.unsubscribe_ = [];
/** @private {number} Maximum scroll position attained */
this.maxScrollDepth_ = 0;
if (this.parent) {
this.parent.addChild_(this);
}
const viewport = Services.viewportForDoc(this.ampdoc);
viewport.onChanged(() => {
this.maybeUpdateMaxScrollDepth(viewport.getScrollTop());
});
}
/**
* @param {!VisibilityManager} child
* @private
*/
addChild_(child) {
if (!this.children_) {
this.children_ = [];
}
this.children_.push(child);
}
/**
* @param {!VisibilityManager} child
* @private
*/
removeChild_(child) {
if (this.children_) {
const index = this.children_.indexOf(child);
if (index != -1) {
this.children_.splice(index, 1);
}
}
}
/** @override */
dispose() {
// Give the chance for all events to complete.
this.setRootVisibility(0);
// Dispose all models.
for (let i = this.models_.length - 1; i >= 0; i--) {
this.models_[i].dispose();
}
// Unsubscribe everything else.
this.unsubscribe_.forEach((unsubscribe) => {
unsubscribe();
});
this.unsubscribe_.length = 0;
if (this.parent) {
this.parent.removeChild_(this);
}
if (this.children_) {
for (let i = 0; i < this.children_.length; i++) {
this.children_[i].dispose();
}
}
}
/**
* @param {!UnlistenDef} handler
*/
unsubscribe(handler) {
this.unsubscribe_.push(handler);
}
/**
* The start time from which all visibility events and times are measured.
* @return {number}
* @abstract
*/
getStartTime() {}
/**
* Whether the visibility root is currently in the background.
* @return {boolean}
* @abstract
*/
isBackgrounded() {}
/**
* Whether the visibility root has been created in the background mode.
* @return {boolean}
* @abstract
*/
isBackgroundedAtStart() {}
/**
* Returns the root's, root's parent's and root's children's
* lowest opacity value
* @return {number}
* @abstract
*/
getRootMinOpacity() {}
/**
* Returns the root's layout rect.
* @return {!../../../src/layout-rect.LayoutRectDef}
* @abstract
*/
getRootLayoutBox() {}
/**
* TODO(#29618): Remove after ampim investigation
* Returns the root element.
* @return {?Element}
* @abstract
*/
getRootElementTemp() {}
/**
* TODO(#29618): Remove after ampim investigation
* @return {?../../../src/layout-rect.LayoutRectDef}
* @abstract
*/
getBoundingClientRectTemp(unusedElement) {}
/**
* TODO(#29618): Remove after ampim investigation
* Returns the element's layout rect calculated by AMP
* @param {!Element} element
* @return {!../../../src/layout-rect.LayoutRectDef}
*/
getElementLayoutBoxTemp(element) {
const resource = this.resources_.getResourceForElementOptional(element);
const layoutBox = resource
? resource.getLayoutBox()
: Services.viewportForDoc(this.ampdoc).getLayoutRect(element);
return layoutBox;
}
/**
* @return {number}
*/
getRootVisibility() {
if (!this.parent) {
return this.rootVisibility_;
}
return this.parent.getRootVisibility() > 0 ? this.rootVisibility_ : 0;
}
/**
* @param {number} visibility
*/
setRootVisibility(visibility) {
this.rootVisibility_ = visibility;
this.updateModels_();
if (this.children_) {
for (let i = 0; i < this.children_.length; i++) {
this.children_[i].updateModels_();
}
}
}
/**
* Update the maximum amount that the user has scrolled down the page.
* @param {number} depth
*/
maybeUpdateMaxScrollDepth(depth) {
if (depth > this.maxScrollDepth_) {
this.maxScrollDepth_ = depth;
}
}
/**
* Gets the maximum amount that the user has scrolled down the page.
* @return {number} depth
*/
getMaxScrollDepth() {
return this.maxScrollDepth_;
}
/** @private */
updateModels_() {
for (let i = 0; i < this.models_.length; i++) {
this.models_[i].update();
}
}
/**
* Listens to the visibility events on the root as the whole and the given
* visibility spec. The visibility tracking can be deferred until
* `readyPromise` is resolved, if specified.
* @param {!JsonObject} spec
* @param {?Promise} readyPromise
* @param {?function():!Promise} createReportPromiseFunc
* @param {function(!JsonObject)} callback
* @return {!UnlistenDef}
*/
listenRoot(spec, readyPromise, createReportPromiseFunc, callback) {
const calcVisibility = this.getRootVisibility.bind(this);
// TODO(#28618) Clean up calcLayoutBoxTemp & calcBoundingClientRectTemp
const calcLayoutBoxTemp = this.getRootLayoutBox.bind(this);
let calcBoundingClientRectTemp;
if (this.getRootElementTemp()) {
calcBoundingClientRectTemp = this.getBoundingClientRectTemp.bind(
this,
this.getRootElementTemp()
);
}
return this.createModelAndListen_(
calcVisibility,
calcLayoutBoxTemp,
calcBoundingClientRectTemp || null,
spec,
readyPromise,
createReportPromiseFunc,
callback
);
}
/**
* Listens to the visibility events for the specified element and the given
* visibility spec. The visibility tracking can be deferred until
* `readyPromise` is resolved, if specified.
* @param {!Element} element
* @param {!JsonObject} spec
* @param {?Promise} readyPromise
* @param {?function():!Promise} createReportPromiseFunc
* @param {function(!JsonObject)} callback
* @return {!UnlistenDef}
*/
listenElement(
element,
spec,
readyPromise,
createReportPromiseFunc,
callback
) {
const calcVisibility = this.getElementVisibility.bind(this, element);
const calculateLayoutBox = this.getElementLayoutBoxTemp.bind(this, element);
const calculateBoundingClientRect = this.getBoundingClientRectTemp.bind(
this,
element
);
return this.createModelAndListen_(
calcVisibility,
calculateLayoutBox,
calculateBoundingClientRect,
spec,
readyPromise,
createReportPromiseFunc,
callback,
element
);
}
/**
* TODO(#29618) Clean up calcLayoutBoxTemp & calcBoundingClientRectTemp
* Create visibilityModel and listen to visible events.
* @param {function():number} calcVisibility
* @param {?function():?../../../src/layout-rect.LayoutRectDef} calcLayoutBoxTemp
* @param {?function():?../../../src/layout-rect.LayoutRectDef} calcBoundingClientRectTemp
* @param {!JsonObject} spec
* @param {?Promise} readyPromise
* @param {?function():!Promise} createReportPromiseFunc
* @param {function(!JsonObject)} callback
* @param {!Element=} opt_element
* @return {!UnlistenDef}
*/
createModelAndListen_(
calcVisibility,
calcLayoutBoxTemp,
calcBoundingClientRectTemp,
spec,
readyPromise,
createReportPromiseFunc,
callback,
opt_element
) {
if (
spec['visiblePercentageThresholds'] &&
spec['visiblePercentageMin'] == undefined &&
spec['visiblePercentageMax'] == undefined
) {
const unlisteners = [];
const ranges = spec['visiblePercentageThresholds'];
if (!ranges || !isArray(ranges)) {
user().error(TAG, 'invalid visiblePercentageThresholds');
return () => {};
}
for (let i = 0; i < ranges.length; i++) {
const percents = ranges[i];
if (!isArray(percents) || percents.length != 2) {
user().error(
TAG,
'visiblePercentageThresholds entry length is not 2'
);
continue;
}
if (!isFiniteNumber(percents[0]) || !isFiniteNumber(percents[1])) {
// not valid number
user().error(
TAG,
'visiblePercentageThresholds entry is not valid number'
);
continue;
}
const min = Number(percents[0]);
const max = Number(percents[1]);
// Min and max must be valid percentages. Min may not be more than max.
// Max is inclusive. Min is usually exclusive, but there are two
// special cases: if min and max are both 0, or both 100, then both
// are inclusive. Otherwise it would not be possible to trigger an
// event on exactly 0% or 100%.
if (
min < 0 ||
max > 100 ||
min > max ||
(min == max && min != 100 && max != 0)
) {
user().error(
TAG,
'visiblePercentageThresholds entry invalid min/max value'
);
continue;
}
const newSpec = spec;
newSpec['visiblePercentageMin'] = min;
newSpec['visiblePercentageMax'] = max;
const model = new VisibilityModel(
newSpec,
calcVisibility,
calcLayoutBoxTemp,
calcBoundingClientRectTemp,
/** @type {?../../../src/service/viewport/viewport-impl.ViewportImpl} */
(Services.viewportForDoc(this.ampdoc))
);
unlisteners.push(
this.listen_(
model,
spec,
readyPromise,
createReportPromiseFunc,
callback,
opt_element
)
);
}
return () => {
unlisteners.forEach((unlistener) => unlistener());
};
}
const model = new VisibilityModel(
spec,
calcVisibility,
calcLayoutBoxTemp,
calcBoundingClientRectTemp,
/** @type {?../../../src/service/viewport/viewport-impl.ViewportImpl} */
(Services.viewportForDoc(this.ampdoc))
);
return this.listen_(
model,
spec,
readyPromise,
createReportPromiseFunc,
callback,
opt_element
);
}
/**
* @param {!VisibilityModel} model
* @param {!JsonObject} spec
* @param {?Promise} readyPromise
* @param {?function():!Promise} createReportPromiseFunc
* @param {function(!JsonObject)} callback
* @param {!Element=} opt_element
* @return {!UnlistenDef}
* @private
*/
listen_(
model,
spec,
readyPromise,
createReportPromiseFunc,
callback,
opt_element
) {
if (createReportPromiseFunc) {
model.setReportReady(createReportPromiseFunc);
}
const viewport = Services.viewportForDoc(this.ampdoc);
const scrollDepth = viewport.getScrollTop();
this.maybeUpdateMaxScrollDepth(scrollDepth);
// Block visibility.
if (readyPromise) {
model.setReady(false);
readyPromise.then(() => {
model.setReady(true);
model.maybeSetInitialScrollDepth(scrollDepth);
});
} else {
model.maybeSetInitialScrollDepth(scrollDepth);
}
// Process the event.
model.onTriggerEvent(() => {
const startTime = this.getStartTime();
const state = model.getState(startTime);
// TODO(#29618): Remove after ampim investigation
state[_GOOGLE_ACTIVEVIEW_ERROR_STATE_NAME] = model.getErrorInfoTemp();
// Additional doc-level state.
state['backgrounded'] = this.isBackgrounded() ? 1 : 0;
state['backgroundedAtStart'] = this.isBackgroundedAtStart() ? 1 : 0;
state['totalTime'] = Date.now() - startTime;
// Optionally, element-level state.
let layoutBox;
if (opt_element) {
state['elementId'] = opt_element.id;
state['opacity'] = getMinOpacity(opt_element);
const resource = this.resources_.getResourceForElementOptional(
opt_element
);
layoutBox = resource
? resource.getLayoutBox()
: viewport.getLayoutRect(opt_element);
const intersectionRatio = this.getElementVisibility(opt_element);
const intersectionRect = this.getElementIntersectionRect(opt_element);
Object.assign(
state,
dict({
'intersectionRatio': intersectionRatio,
'intersectionRect': JSON.stringify(intersectionRect),
})
);
} else {
state['opacity'] = this.getRootMinOpacity();
state['intersectionRatio'] = this.getRootVisibility();
layoutBox = this.getRootLayoutBox();
}
model.maybeDispose();
if (layoutBox) {
Object.assign(
state,
dict({
'elementX': layoutBox.left,
'elementY': layoutBox.top,
'elementWidth': layoutBox.width,
'elementHeight': layoutBox.height,
})
);
state['initialScrollDepth'] = layoutPositionRelativeToScrolledViewport(
layoutBox,
viewport,
model.getInitialScrollDepth()
);
state['maxScrollDepth'] = layoutPositionRelativeToScrolledViewport(
layoutBox,
viewport,
this.getMaxScrollDepth()
);
}
callback(state);
});
this.models_.push(model);
model.unsubscribe(() => {
const index = this.models_.indexOf(model);
if (index != -1) {
this.models_.splice(index, 1);
}
});
// Observe the element via InOb.
if (opt_element) {
// It's important that this happens after all the setup is done, b/c
// intersection observer can fire immedidately. Per spec, this should
// NOT happen. However, all of the existing InOb polyfills, as well as
// some versions of native implementations, make this mistake.
model.unsubscribe(this.observe(opt_element, () => model.update()));
}
// Start update.
model.update();
return function () {
model.dispose();
};
}
/**
* Observes the intersections of the specified element in the viewport.
* @param {!Element} unusedElement
* @param {function(number)} unusedListener
* @return {!UnlistenDef}
* @protected
* @abstract
*/
observe(unusedElement, unusedListener) {}
/**
* @param {!Element} unusedElement
* @return {number}
* @abstract
*/
getElementVisibility(unusedElement) {}
/**
* @param {!Element} unusedElement
* @return {?JsonObject}
* @abstract
*/
getElementIntersectionRect(unusedElement) {}
}
/**
* The implementation of `VisibilityManager` for an AMP document. Two
* distinct modes are supported: the main AMP doc and a in-a-box doc.
*/
export class VisibilityManagerForDoc extends VisibilityManager {
/**
* @param {!../../../src/service/ampdoc-impl.AmpDoc} ampdoc
*/
constructor(ampdoc) {
super(/* parent */ null, ampdoc);
/** @const @private */
this.viewport_ = Services.viewportForDoc(ampdoc);
/** @private {boolean} */
this.backgrounded_ = !ampdoc.isVisible();
/** @const @private {boolean} */
this.backgroundedAtStart_ = this.isBackgrounded();
/**
* @const
* @private {!Object<number, {
* element: !Element,
* intersectionRatio: number,
* boundingClientRectTemp: ?../../../src/layout-rect.LayoutRectDef,
* listeners: !Array<function(number)>
* }>}
*/
this.trackedElements_ = map();
/** @private {?Element} */
this.rootElementTemp_ = null;
/** @private {?IntersectionObserver} */
this.intersectionObserver_ = null;
if (getMode(this.ampdoc.win).runtime == 'inabox') {
// In-a-box: visibility depends on the InOb.
const root = this.ampdoc.getRootNode();
const rootElement = dev().assertElement(
root.documentElement || root.body || root
);
this.rootElementTemp_ = rootElement;
this.unsubscribe(
this.observe(rootElement, this.setRootVisibility.bind(this))
);
} else {
// Main document: visibility is based on the ampdoc.
this.setRootVisibility(this.ampdoc.isVisible() ? 1 : 0);
this.unsubscribe(
this.ampdoc.onVisibilityChanged(() => {
const isVisible = this.ampdoc.isVisible();
if (!isVisible) {
this.backgrounded_ = true;
}
this.setRootVisibility(isVisible ? 1 : 0);
})
);
}
}
/** @override */
dispose() {
super.dispose();
if (this.intersectionObserver_) {
this.intersectionObserver_.disconnect();
this.intersectionObserver_ = null;
}
}
/** @override */
getStartTime() {
return dev().assertNumber(this.ampdoc.getFirstVisibleTime());
}
/** @override */
isBackgrounded() {
return this.backgrounded_;
}
/** @override */
isBackgroundedAtStart() {
return this.backgroundedAtStart_;
}
/** @override */
getRootMinOpacity() {
const root = this.ampdoc.getRootNode();
const rootElement = dev().assertElement(
root.documentElement || root.body || root
);
return getMinOpacity(rootElement);
}
/**
* TODO(#29618): Remove after ampim investigation
* @override
*/
getRootElementTemp() {
return this.rootElementTemp_;
}
/** @override */
getRootLayoutBox() {
// This code is the same for "in-a-box" and standalone doc.
const root = this.ampdoc.getRootNode();
const rootElement = dev().assertElement(
root.documentElement || root.body || root
);
return this.viewport_.getLayoutRect(rootElement);
}
/** @override */
observe(element, listener) {
const id = getElementId(element);
let trackedElement = this.trackedElements_[id];
if (!trackedElement) {
trackedElement = {
element,
intersectionRatio: 0,
intersectionRect: null,
boundingClientRectTemp: null, // TODO(#29618) Clean up
listeners: [],
};
this.trackedElements_[id] = trackedElement;
} else if (trackedElement.intersectionRatio > 0) {
// This has already been tracked and the `intersectionRatio` is fresh.
listener(trackedElement.intersectionRatio);
}
trackedElement.listeners.push(listener);
this.getIntersectionObserver_().observe(element);
return () => {
const trackedElement = this.trackedElements_[id];
if (trackedElement) {
const index = trackedElement.listeners.indexOf(listener);
if (index != -1) {
trackedElement.listeners.splice(index, 1);
}
if (trackedElement.listeners.length == 0) {
this.intersectionObserver_.unobserve(element);
delete this.trackedElements_[id];
}
}
};
}
/** @override */
getElementVisibility(element) {
if (this.getRootVisibility() == 0) {
return 0;
}
const id = getElementId(element);
const trackedElement = this.trackedElements_[id];
return (trackedElement && trackedElement.intersectionRatio) || 0;
}
/**
* TODO(#29618): Remove after ampim investigation
* @override
* */
getBoundingClientRectTemp(element) {
if (!element) {
return null;
}
const id = getElementId(element);
const trackedElement = this.trackedElements_[id];
return trackedElement && trackedElement.boundingClientRectTemp;
}
/**
* Gets the intersection element.
*
* @param {!Element} element
* @return {?JsonObject}
*/
getElementIntersectionRect(element) {
if (this.getElementVisibility(element) <= 0) {
return null;
}
const id = getElementId(element);
const trackedElement = this.trackedElements_[id];
if (trackedElement) {
return /** @type {!JsonObject} */ (trackedElement.intersectionRect);
}
return null;
}
/**
* @return {!IntersectionObserver}
* @private
*/
getIntersectionObserver_() {
if (!this.intersectionObserver_) {
const {win} = this.ampdoc;
this.intersectionObserver_ = new win.IntersectionObserver(
this.onIntersectionChanges_.bind(this),
{threshold: DEFAULT_THRESHOLD}
);
}
return this.intersectionObserver_;
}
/**
* @param {!Array<!IntersectionObserverEntry>} entries
* @private
*/
onIntersectionChanges_(entries) {
entries.forEach((change) => {
let intersection = change.intersectionRect;
// IntersectionRect type now changed from ClientRect to DOMRectReadOnly.
// TODO(@zhouyx): Fix all InOb related type.
intersection = layoutRectLtwh(
Number(intersection.left),
Number(intersection.top),
Number(intersection.width),
Number(intersection.height)
);
// TODO(#29618): Remove after ampim investigation
let {boundingClientRect} = change;
boundingClientRect =
boundingClientRect &&
layoutRectLtwh(
Number(boundingClientRect.left),
Number(boundingClientRect.top),
Number(boundingClientRect.width),
Number(boundingClientRect.height)
);
this.onIntersectionChange_(
change.target,
change.intersectionRatio,
intersection,
boundingClientRect
);
});
}
/**
* TODO(#29618): Clean up boundingClientRect after ampim investigation
* @param {!Element} target
* @param {number} intersectionRatio
* @param {!../../../src/layout-rect.LayoutRectDef} intersectionRect
* @param {!../../../src/layout-rect.LayoutRectDef} boundingClientRect
* @private
*/
onIntersectionChange_(
target,
intersectionRatio,
intersectionRect,
boundingClientRect
) {
intersectionRatio = Math.min(Math.max(intersectionRatio, 0), 1);
const id = getElementId(target);
const trackedElement = this.trackedElements_[id];
if (trackedElement) {
trackedElement.intersectionRatio = intersectionRatio;
trackedElement.intersectionRect = intersectionRect;
trackedElement.boundingClientRectTemp = boundingClientRect;
for (let i = 0; i < trackedElement.listeners.length; i++) {
trackedElement.listeners[i](intersectionRatio);
}
}
}
}
/**
* The implementation of `VisibilityManager` for a FIE embed. This visibility
* root delegates most of tracking functions to its parent, the ampdoc root.
*/
export class VisibilityManagerForEmbed extends VisibilityManager {
/**
* @param {!VisibilityManager} parent
* @param {!../../../src/friendly-iframe-embed.FriendlyIframeEmbed} embed
*/
constructor(parent, embed) {
super(parent, parent.ampdoc);
/** @const */
this.embed = embed;
/** @const @private {boolean} */
this.backgroundedAtStart_ = this.parent.isBackgrounded();
this.unsubscribe(
this.parent.observe(
dev().assertElement(embed.host),
this.setRootVisibility.bind(this)
)
);
}
/** @override */
getStartTime() {
return this.embed.getStartTime();
}
/** @override */
isBackgrounded() {
return this.parent.isBackgrounded();
}
/** @override */
isBackgroundedAtStart() {
return this.backgroundedAtStart_;
}
/** @override */
getRootMinOpacity() {
const rootElement = dev().assertElement(this.embed.iframe);
return getMinOpacity(rootElement);
}
/**
* TODO(#29618): Remove after ampim investigation
* @override
* */
getRootElementTemp() {
// No need to track root element for embed
return null;
}
/**
* TODO(#29618): Remove after ampim investigation
* @override
* */
getBoundingClientRectTemp() {
return null;
}
/**
* Gets the layout box of the embedded document. Note that this may be
* smaller than the size allocated by the host. In that case, the document
* will be centered, and the unfilled space will not be reflected in this
* return value.
* embed.iframe is used to calculate the root layoutbox, since it is more
* important for the embedded document to know its own size, rather than
* the size of the host rectangle which it may or may not entirely fill.
* embed.host is used to calculate the root visibility, however, since
* the visibility of the host element directly determines the embedded
* document's visibility.
* @override
*/
getRootLayoutBox() {
const rootElement = dev().assertElement(this.embed.iframe);