@angular/cdk
Version:
Angular Material Component Development Kit
453 lines • 71.5 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Platform, normalizePassiveListenerOptions, _getShadowRoot, _getEventTarget, } from '@angular/cdk/platform';
import { Directive, ElementRef, EventEmitter, Inject, Injectable, InjectionToken, NgZone, Optional, Output, } from '@angular/core';
import { of as observableOf, Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { coerceElement } from '@angular/cdk/coercion';
import { DOCUMENT } from '@angular/common';
import { InputModalityDetector, TOUCH_BUFFER_MS } from '../input-modality/input-modality-detector';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/platform";
import * as i2 from "../input-modality/input-modality-detector";
/** InjectionToken for FocusMonitorOptions. */
export const FOCUS_MONITOR_DEFAULT_OPTIONS = new InjectionToken('cdk-focus-monitor-default-options');
/**
* Event listener options that enable capturing and also
* mark the listener as passive if the browser supports it.
*/
const captureEventListenerOptions = normalizePassiveListenerOptions({
passive: true,
capture: true,
});
/** Monitors mouse and keyboard events to determine the cause of focus events. */
class FocusMonitor {
constructor(_ngZone, _platform, _inputModalityDetector,
/** @breaking-change 11.0.0 make document required */
document, options) {
this._ngZone = _ngZone;
this._platform = _platform;
this._inputModalityDetector = _inputModalityDetector;
/** The focus origin that the next focus event is a result of. */
this._origin = null;
/** Whether the window has just been focused. */
this._windowFocused = false;
/**
* Whether the origin was determined via a touch interaction. Necessary as properly attributing
* focus events to touch interactions requires special logic.
*/
this._originFromTouchInteraction = false;
/** Map of elements being monitored to their info. */
this._elementInfo = new Map();
/** The number of elements currently being monitored. */
this._monitoredElementCount = 0;
/**
* Keeps track of the root nodes to which we've currently bound a focus/blur handler,
* as well as the number of monitored elements that they contain. We have to treat focus/blur
* handlers differently from the rest of the events, because the browser won't emit events
* to the document when focus moves inside of a shadow root.
*/
this._rootNodeFocusListenerCount = new Map();
/**
* Event listener for `focus` events on the window.
* Needs to be an arrow function in order to preserve the context when it gets bound.
*/
this._windowFocusListener = () => {
// Make a note of when the window regains focus, so we can
// restore the origin info for the focused element.
this._windowFocused = true;
this._windowFocusTimeoutId = window.setTimeout(() => (this._windowFocused = false));
};
/** Subject for stopping our InputModalityDetector subscription. */
this._stopInputModalityDetector = new Subject();
/**
* Event listener for `focus` and 'blur' events on the document.
* Needs to be an arrow function in order to preserve the context when it gets bound.
*/
this._rootNodeFocusAndBlurListener = (event) => {
const target = _getEventTarget(event);
// We need to walk up the ancestor chain in order to support `checkChildren`.
for (let element = target; element; element = element.parentElement) {
if (event.type === 'focus') {
this._onFocus(event, element);
}
else {
this._onBlur(event, element);
}
}
};
this._document = document;
this._detectionMode = options?.detectionMode || 0 /* FocusMonitorDetectionMode.IMMEDIATE */;
}
monitor(element, checkChildren = false) {
const nativeElement = coerceElement(element);
// Do nothing if we're not on the browser platform or the passed in node isn't an element.
if (!this._platform.isBrowser || nativeElement.nodeType !== 1) {
return observableOf(null);
}
// If the element is inside the shadow DOM, we need to bind our focus/blur listeners to
// the shadow root, rather than the `document`, because the browser won't emit focus events
// to the `document`, if focus is moving within the same shadow root.
const rootNode = _getShadowRoot(nativeElement) || this._getDocument();
const cachedInfo = this._elementInfo.get(nativeElement);
// Check if we're already monitoring this element.
if (cachedInfo) {
if (checkChildren) {
// TODO(COMP-318): this can be problematic, because it'll turn all non-checkChildren
// observers into ones that behave as if `checkChildren` was turned on. We need a more
// robust solution.
cachedInfo.checkChildren = true;
}
return cachedInfo.subject;
}
// Create monitored element info.
const info = {
checkChildren: checkChildren,
subject: new Subject(),
rootNode,
};
this._elementInfo.set(nativeElement, info);
this._registerGlobalListeners(info);
return info.subject;
}
stopMonitoring(element) {
const nativeElement = coerceElement(element);
const elementInfo = this._elementInfo.get(nativeElement);
if (elementInfo) {
elementInfo.subject.complete();
this._setClasses(nativeElement);
this._elementInfo.delete(nativeElement);
this._removeGlobalListeners(elementInfo);
}
}
focusVia(element, origin, options) {
const nativeElement = coerceElement(element);
const focusedElement = this._getDocument().activeElement;
// If the element is focused already, calling `focus` again won't trigger the event listener
// which means that the focus classes won't be updated. If that's the case, update the classes
// directly without waiting for an event.
if (nativeElement === focusedElement) {
this._getClosestElementsInfo(nativeElement).forEach(([currentElement, info]) => this._originChanged(currentElement, origin, info));
}
else {
this._setOrigin(origin);
// `focus` isn't available on the server
if (typeof nativeElement.focus === 'function') {
nativeElement.focus(options);
}
}
}
ngOnDestroy() {
this._elementInfo.forEach((_info, element) => this.stopMonitoring(element));
}
/** Access injected document if available or fallback to global document reference */
_getDocument() {
return this._document || document;
}
/** Use defaultView of injected document if available or fallback to global window reference */
_getWindow() {
const doc = this._getDocument();
return doc.defaultView || window;
}
_getFocusOrigin(focusEventTarget) {
if (this._origin) {
// If the origin was realized via a touch interaction, we need to perform additional checks
// to determine whether the focus origin should be attributed to touch or program.
if (this._originFromTouchInteraction) {
return this._shouldBeAttributedToTouch(focusEventTarget) ? 'touch' : 'program';
}
else {
return this._origin;
}
}
// If the window has just regained focus, we can restore the most recent origin from before the
// window blurred. Otherwise, we've reached the point where we can't identify the source of the
// focus. This typically means one of two things happened:
//
// 1) The element was programmatically focused, or
// 2) The element was focused via screen reader navigation (which generally doesn't fire
// events).
//
// Because we can't distinguish between these two cases, we default to setting `program`.
if (this._windowFocused && this._lastFocusOrigin) {
return this._lastFocusOrigin;
}
// If the interaction is coming from an input label, we consider it a mouse interactions.
// This is a special case where focus moves on `click`, rather than `mousedown` which breaks
// our detection, because all our assumptions are for `mousedown`. We need to handle this
// special case, because it's very common for checkboxes and radio buttons.
if (focusEventTarget && this._isLastInteractionFromInputLabel(focusEventTarget)) {
return 'mouse';
}
return 'program';
}
/**
* Returns whether the focus event should be attributed to touch. Recall that in IMMEDIATE mode, a
* touch origin isn't immediately reset at the next tick (see _setOrigin). This means that when we
* handle a focus event following a touch interaction, we need to determine whether (1) the focus
* event was directly caused by the touch interaction or (2) the focus event was caused by a
* subsequent programmatic focus call triggered by the touch interaction.
* @param focusEventTarget The target of the focus event under examination.
*/
_shouldBeAttributedToTouch(focusEventTarget) {
// Please note that this check is not perfect. Consider the following edge case:
//
// <div #parent tabindex="0">
// <div #child tabindex="0" (click)="#parent.focus()"></div>
// </div>
//
// Suppose there is a FocusMonitor in IMMEDIATE mode attached to #parent. When the user touches
// #child, #parent is programmatically focused. This code will attribute the focus to touch
// instead of program. This is a relatively minor edge-case that can be worked around by using
// focusVia(parent, 'program') to focus #parent.
return (this._detectionMode === 1 /* FocusMonitorDetectionMode.EVENTUAL */ ||
!!focusEventTarget?.contains(this._inputModalityDetector._mostRecentTarget));
}
/**
* Sets the focus classes on the element based on the given focus origin.
* @param element The element to update the classes on.
* @param origin The focus origin.
*/
_setClasses(element, origin) {
element.classList.toggle('cdk-focused', !!origin);
element.classList.toggle('cdk-touch-focused', origin === 'touch');
element.classList.toggle('cdk-keyboard-focused', origin === 'keyboard');
element.classList.toggle('cdk-mouse-focused', origin === 'mouse');
element.classList.toggle('cdk-program-focused', origin === 'program');
}
/**
* Updates the focus origin. If we're using immediate detection mode, we schedule an async
* function to clear the origin at the end of a timeout. The duration of the timeout depends on
* the origin being set.
* @param origin The origin to set.
* @param isFromInteraction Whether we are setting the origin from an interaction event.
*/
_setOrigin(origin, isFromInteraction = false) {
this._ngZone.runOutsideAngular(() => {
this._origin = origin;
this._originFromTouchInteraction = origin === 'touch' && isFromInteraction;
// If we're in IMMEDIATE mode, reset the origin at the next tick (or in `TOUCH_BUFFER_MS` ms
// for a touch event). We reset the origin at the next tick because Firefox focuses one tick
// after the interaction event. We wait `TOUCH_BUFFER_MS` ms before resetting the origin for
// a touch event because when a touch event is fired, the associated focus event isn't yet in
// the event queue. Before doing so, clear any pending timeouts.
if (this._detectionMode === 0 /* FocusMonitorDetectionMode.IMMEDIATE */) {
clearTimeout(this._originTimeoutId);
const ms = this._originFromTouchInteraction ? TOUCH_BUFFER_MS : 1;
this._originTimeoutId = setTimeout(() => (this._origin = null), ms);
}
});
}
/**
* Handles focus events on a registered element.
* @param event The focus event.
* @param element The monitored element.
*/
_onFocus(event, element) {
// NOTE(mmalerba): We currently set the classes based on the focus origin of the most recent
// focus event affecting the monitored element. If we want to use the origin of the first event
// instead we should check for the cdk-focused class here and return if the element already has
// it. (This only matters for elements that have includesChildren = true).
// If we are not counting child-element-focus as focused, make sure that the event target is the
// monitored element itself.
const elementInfo = this._elementInfo.get(element);
const focusEventTarget = _getEventTarget(event);
if (!elementInfo || (!elementInfo.checkChildren && element !== focusEventTarget)) {
return;
}
this._originChanged(element, this._getFocusOrigin(focusEventTarget), elementInfo);
}
/**
* Handles blur events on a registered element.
* @param event The blur event.
* @param element The monitored element.
*/
_onBlur(event, element) {
// If we are counting child-element-focus as focused, make sure that we aren't just blurring in
// order to focus another child of the monitored element.
const elementInfo = this._elementInfo.get(element);
if (!elementInfo ||
(elementInfo.checkChildren &&
event.relatedTarget instanceof Node &&
element.contains(event.relatedTarget))) {
return;
}
this._setClasses(element);
this._emitOrigin(elementInfo, null);
}
_emitOrigin(info, origin) {
if (info.subject.observers.length) {
this._ngZone.run(() => info.subject.next(origin));
}
}
_registerGlobalListeners(elementInfo) {
if (!this._platform.isBrowser) {
return;
}
const rootNode = elementInfo.rootNode;
const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode) || 0;
if (!rootNodeFocusListeners) {
this._ngZone.runOutsideAngular(() => {
rootNode.addEventListener('focus', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
rootNode.addEventListener('blur', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
});
}
this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners + 1);
// Register global listeners when first element is monitored.
if (++this._monitoredElementCount === 1) {
// Note: we listen to events in the capture phase so we
// can detect them even if the user stops propagation.
this._ngZone.runOutsideAngular(() => {
const window = this._getWindow();
window.addEventListener('focus', this._windowFocusListener);
});
// The InputModalityDetector is also just a collection of global listeners.
this._inputModalityDetector.modalityDetected
.pipe(takeUntil(this._stopInputModalityDetector))
.subscribe(modality => {
this._setOrigin(modality, true /* isFromInteraction */);
});
}
}
_removeGlobalListeners(elementInfo) {
const rootNode = elementInfo.rootNode;
if (this._rootNodeFocusListenerCount.has(rootNode)) {
const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode);
if (rootNodeFocusListeners > 1) {
this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners - 1);
}
else {
rootNode.removeEventListener('focus', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
rootNode.removeEventListener('blur', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
this._rootNodeFocusListenerCount.delete(rootNode);
}
}
// Unregister global listeners when last element is unmonitored.
if (!--this._monitoredElementCount) {
const window = this._getWindow();
window.removeEventListener('focus', this._windowFocusListener);
// Equivalently, stop our InputModalityDetector subscription.
this._stopInputModalityDetector.next();
// Clear timeouts for all potentially pending timeouts to prevent the leaks.
clearTimeout(this._windowFocusTimeoutId);
clearTimeout(this._originTimeoutId);
}
}
/** Updates all the state on an element once its focus origin has changed. */
_originChanged(element, origin, elementInfo) {
this._setClasses(element, origin);
this._emitOrigin(elementInfo, origin);
this._lastFocusOrigin = origin;
}
/**
* Collects the `MonitoredElementInfo` of a particular element and
* all of its ancestors that have enabled `checkChildren`.
* @param element Element from which to start the search.
*/
_getClosestElementsInfo(element) {
const results = [];
this._elementInfo.forEach((info, currentElement) => {
if (currentElement === element || (info.checkChildren && currentElement.contains(element))) {
results.push([currentElement, info]);
}
});
return results;
}
/**
* Returns whether an interaction is likely to have come from the user clicking the `label` of
* an `input` or `textarea` in order to focus it.
* @param focusEventTarget Target currently receiving focus.
*/
_isLastInteractionFromInputLabel(focusEventTarget) {
const { _mostRecentTarget: mostRecentTarget, mostRecentModality } = this._inputModalityDetector;
// If the last interaction used the mouse on an element contained by one of the labels
// of an `input`/`textarea` that is currently focused, it is very likely that the
// user redirected focus using the label.
if (mostRecentModality !== 'mouse' ||
!mostRecentTarget ||
mostRecentTarget === focusEventTarget ||
(focusEventTarget.nodeName !== 'INPUT' && focusEventTarget.nodeName !== 'TEXTAREA') ||
focusEventTarget.disabled) {
return false;
}
const labels = focusEventTarget.labels;
if (labels) {
for (let i = 0; i < labels.length; i++) {
if (labels[i].contains(mostRecentTarget)) {
return true;
}
}
}
return false;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.0.0-next.7", ngImport: i0, type: FocusMonitor, deps: [{ token: i0.NgZone }, { token: i1.Platform }, { token: i2.InputModalityDetector }, { token: DOCUMENT, optional: true }, { token: FOCUS_MONITOR_DEFAULT_OPTIONS, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.0.0-next.7", ngImport: i0, type: FocusMonitor, providedIn: 'root' }); }
}
export { FocusMonitor };
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.0.0-next.7", ngImport: i0, type: FocusMonitor, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i0.NgZone }, { type: i1.Platform }, { type: i2.InputModalityDetector }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [DOCUMENT]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [FOCUS_MONITOR_DEFAULT_OPTIONS]
}] }]; } });
/**
* Directive that determines how a particular element was focused (via keyboard, mouse, touch, or
* programmatically) and adds corresponding classes to the element.
*
* There are two variants of this directive:
* 1) cdkMonitorElementFocus: does not consider an element to be focused if one of its children is
* focused.
* 2) cdkMonitorSubtreeFocus: considers an element focused if it or any of its children are focused.
*/
class CdkMonitorFocus {
constructor(_elementRef, _focusMonitor) {
this._elementRef = _elementRef;
this._focusMonitor = _focusMonitor;
this._focusOrigin = null;
this.cdkFocusChange = new EventEmitter();
}
get focusOrigin() {
return this._focusOrigin;
}
ngAfterViewInit() {
const element = this._elementRef.nativeElement;
this._monitorSubscription = this._focusMonitor
.monitor(element, element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))
.subscribe(origin => {
this._focusOrigin = origin;
this.cdkFocusChange.emit(origin);
});
}
ngOnDestroy() {
this._focusMonitor.stopMonitoring(this._elementRef);
if (this._monitorSubscription) {
this._monitorSubscription.unsubscribe();
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.0.0-next.7", ngImport: i0, type: CdkMonitorFocus, deps: [{ token: i0.ElementRef }, { token: FocusMonitor }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.0.0-next.7", type: CdkMonitorFocus, selector: "[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]", outputs: { cdkFocusChange: "cdkFocusChange" }, exportAs: ["cdkMonitorFocus"], ngImport: i0 }); }
}
export { CdkMonitorFocus };
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.0.0-next.7", ngImport: i0, type: CdkMonitorFocus, decorators: [{
type: Directive,
args: [{
selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',
exportAs: 'cdkMonitorFocus',
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: FocusMonitor }]; }, propDecorators: { cdkFocusChange: [{
type: Output
}] } });
//# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  Platform,\n  normalizePassiveListenerOptions,\n  _getShadowRoot,\n  _getEventTarget,\n} from '@angular/cdk/platform';\nimport {\n  Directive,\n  ElementRef,\n  EventEmitter,\n  Inject,\n  Injectable,\n  InjectionToken,\n  NgZone,\n  OnDestroy,\n  Optional,\n  Output,\n  AfterViewInit,\n} from '@angular/core';\nimport {Observable, of as observableOf, Subject, Subscription} from 'rxjs';\nimport {takeUntil} from 'rxjs/operators';\nimport {coerceElement} from '@angular/cdk/coercion';\nimport {DOCUMENT} from '@angular/common';\nimport {InputModalityDetector, TOUCH_BUFFER_MS} from '../input-modality/input-modality-detector';\n\nexport type FocusOrigin = 'touch' | 'mouse' | 'keyboard' | 'program' | null;\n\n/**\n * Corresponds to the options that can be passed to the native `focus` event.\n * via https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/focus\n */\nexport interface FocusOptions {\n  /** Whether the browser should scroll to the element when it is focused. */\n  preventScroll?: boolean;\n}\n\n/** Detection mode used for attributing the origin of a focus event. */\nexport const enum FocusMonitorDetectionMode {\n  /**\n   * Any mousedown, keydown, or touchstart event that happened in the previous\n   * tick or the current tick will be used to assign a focus event's origin (to\n   * either mouse, keyboard, or touch). This is the default option.\n   */\n  IMMEDIATE,\n  /**\n   * A focus event's origin is always attributed to the last corresponding\n   * mousedown, keydown, or touchstart event, no matter how long ago it occurred.\n   */\n  EVENTUAL,\n}\n\n/** Injectable service-level options for FocusMonitor. */\nexport interface FocusMonitorOptions {\n  detectionMode?: FocusMonitorDetectionMode;\n}\n\n/** InjectionToken for FocusMonitorOptions. */\nexport const FOCUS_MONITOR_DEFAULT_OPTIONS = new InjectionToken<FocusMonitorOptions>(\n  'cdk-focus-monitor-default-options',\n);\n\ntype MonitoredElementInfo = {\n  checkChildren: boolean;\n  readonly subject: Subject<FocusOrigin>;\n  rootNode: HTMLElement | ShadowRoot | Document;\n};\n\n/**\n * Event listener options that enable capturing and also\n * mark the listener as passive if the browser supports it.\n */\nconst captureEventListenerOptions = normalizePassiveListenerOptions({\n  passive: true,\n  capture: true,\n});\n\n/** Monitors mouse and keyboard events to determine the cause of focus events. */\n@Injectable({providedIn: 'root'})\nexport class FocusMonitor implements OnDestroy {\n  /** The focus origin that the next focus event is a result of. */\n  private _origin: FocusOrigin = null;\n\n  /** The FocusOrigin of the last focus event tracked by the FocusMonitor. */\n  private _lastFocusOrigin: FocusOrigin;\n\n  /** Whether the window has just been focused. */\n  private _windowFocused = false;\n\n  /** The timeout id of the window focus timeout. */\n  private _windowFocusTimeoutId: number;\n\n  /** The timeout id of the origin clearing timeout. */\n  private _originTimeoutId: number;\n\n  /**\n   * Whether the origin was determined via a touch interaction. Necessary as properly attributing\n   * focus events to touch interactions requires special logic.\n   */\n  private _originFromTouchInteraction = false;\n\n  /** Map of elements being monitored to their info. */\n  private _elementInfo = new Map<HTMLElement, MonitoredElementInfo>();\n\n  /** The number of elements currently being monitored. */\n  private _monitoredElementCount = 0;\n\n  /**\n   * Keeps track of the root nodes to which we've currently bound a focus/blur handler,\n   * as well as the number of monitored elements that they contain. We have to treat focus/blur\n   * handlers differently from the rest of the events, because the browser won't emit events\n   * to the document when focus moves inside of a shadow root.\n   */\n  private _rootNodeFocusListenerCount = new Map<HTMLElement | Document | ShadowRoot, number>();\n\n  /**\n   * The specified detection mode, used for attributing the origin of a focus\n   * event.\n   */\n  private readonly _detectionMode: FocusMonitorDetectionMode;\n\n  /**\n   * Event listener for `focus` events on the window.\n   * Needs to be an arrow function in order to preserve the context when it gets bound.\n   */\n  private _windowFocusListener = () => {\n    // Make a note of when the window regains focus, so we can\n    // restore the origin info for the focused element.\n    this._windowFocused = true;\n    this._windowFocusTimeoutId = window.setTimeout(() => (this._windowFocused = false));\n  };\n\n  /** Used to reference correct document/window */\n  protected _document?: Document;\n\n  /** Subject for stopping our InputModalityDetector subscription. */\n  private readonly _stopInputModalityDetector = new Subject<void>();\n\n  constructor(\n    private _ngZone: NgZone,\n    private _platform: Platform,\n    private readonly _inputModalityDetector: InputModalityDetector,\n    /** @breaking-change 11.0.0 make document required */\n    @Optional() @Inject(DOCUMENT) document: any | null,\n    @Optional() @Inject(FOCUS_MONITOR_DEFAULT_OPTIONS) options: FocusMonitorOptions | null,\n  ) {\n    this._document = document;\n    this._detectionMode = options?.detectionMode || FocusMonitorDetectionMode.IMMEDIATE;\n  }\n  /**\n   * Event listener for `focus` and 'blur' events on the document.\n   * Needs to be an arrow function in order to preserve the context when it gets bound.\n   */\n  private _rootNodeFocusAndBlurListener = (event: Event) => {\n    const target = _getEventTarget<HTMLElement>(event);\n\n    // We need to walk up the ancestor chain in order to support `checkChildren`.\n    for (let element = target; element; element = element.parentElement) {\n      if (event.type === 'focus') {\n        this._onFocus(event as FocusEvent, element);\n      } else {\n        this._onBlur(event as FocusEvent, element);\n      }\n    }\n  };\n\n  /**\n   * Monitors focus on an element and applies appropriate CSS classes.\n   * @param element The element to monitor\n   * @param checkChildren Whether to count the element as focused when its children are focused.\n   * @returns An observable that emits when the focus state of the element changes.\n   *     When the element is blurred, null will be emitted.\n   */\n  monitor(element: HTMLElement, checkChildren?: boolean): Observable<FocusOrigin>;\n\n  /**\n   * Monitors focus on an element and applies appropriate CSS classes.\n   * @param element The element to monitor\n   * @param checkChildren Whether to count the element as focused when its children are focused.\n   * @returns An observable that emits when the focus state of the element changes.\n   *     When the element is blurred, null will be emitted.\n   */\n  monitor(element: ElementRef<HTMLElement>, checkChildren?: boolean): Observable<FocusOrigin>;\n\n  monitor(\n    element: HTMLElement | ElementRef<HTMLElement>,\n    checkChildren: boolean = false,\n  ): Observable<FocusOrigin> {\n    const nativeElement = coerceElement(element);\n\n    // Do nothing if we're not on the browser platform or the passed in node isn't an element.\n    if (!this._platform.isBrowser || nativeElement.nodeType !== 1) {\n      return observableOf(null);\n    }\n\n    // If the element is inside the shadow DOM, we need to bind our focus/blur listeners to\n    // the shadow root, rather than the `document`, because the browser won't emit focus events\n    // to the `document`, if focus is moving within the same shadow root.\n    const rootNode = _getShadowRoot(nativeElement) || this._getDocument();\n    const cachedInfo = this._elementInfo.get(nativeElement);\n\n    // Check if we're already monitoring this element.\n    if (cachedInfo) {\n      if (checkChildren) {\n        // TODO(COMP-318): this can be problematic, because it'll turn all non-checkChildren\n        // observers into ones that behave as if `checkChildren` was turned on. We need a more\n        // robust solution.\n        cachedInfo.checkChildren = true;\n      }\n\n      return cachedInfo.subject;\n    }\n\n    // Create monitored element info.\n    const info: MonitoredElementInfo = {\n      checkChildren: checkChildren,\n      subject: new Subject<FocusOrigin>(),\n      rootNode,\n    };\n    this._elementInfo.set(nativeElement, info);\n    this._registerGlobalListeners(info);\n\n    return info.subject;\n  }\n\n  /**\n   * Stops monitoring an element and removes all focus classes.\n   * @param element The element to stop monitoring.\n   */\n  stopMonitoring(element: HTMLElement): void;\n\n  /**\n   * Stops monitoring an element and removes all focus classes.\n   * @param element The element to stop monitoring.\n   */\n  stopMonitoring(element: ElementRef<HTMLElement>): void;\n\n  stopMonitoring(element: HTMLElement | ElementRef<HTMLElement>): void {\n    const nativeElement = coerceElement(element);\n    const elementInfo = this._elementInfo.get(nativeElement);\n\n    if (elementInfo) {\n      elementInfo.subject.complete();\n\n      this._setClasses(nativeElement);\n      this._elementInfo.delete(nativeElement);\n      this._removeGlobalListeners(elementInfo);\n    }\n  }\n\n  /**\n   * Focuses the element via the specified focus origin.\n   * @param element Element to focus.\n   * @param origin Focus origin.\n   * @param options Options that can be used to configure the focus behavior.\n   */\n  focusVia(element: HTMLElement, origin: FocusOrigin, options?: FocusOptions): void;\n\n  /**\n   * Focuses the element via the specified focus origin.\n   * @param element Element to focus.\n   * @param origin Focus origin.\n   * @param options Options that can be used to configure the focus behavior.\n   */\n  focusVia(element: ElementRef<HTMLElement>, origin: FocusOrigin, options?: FocusOptions): void;\n\n  focusVia(\n    element: HTMLElement | ElementRef<HTMLElement>,\n    origin: FocusOrigin,\n    options?: FocusOptions,\n  ): void {\n    const nativeElement = coerceElement(element);\n    const focusedElement = this._getDocument().activeElement;\n\n    // If the element is focused already, calling `focus` again won't trigger the event listener\n    // which means that the focus classes won't be updated. If that's the case, update the classes\n    // directly without waiting for an event.\n    if (nativeElement === focusedElement) {\n      this._getClosestElementsInfo(nativeElement).forEach(([currentElement, info]) =>\n        this._originChanged(currentElement, origin, info),\n      );\n    } else {\n      this._setOrigin(origin);\n\n      // `focus` isn't available on the server\n      if (typeof nativeElement.focus === 'function') {\n        nativeElement.focus(options);\n      }\n    }\n  }\n\n  ngOnDestroy() {\n    this._elementInfo.forEach((_info, element) => this.stopMonitoring(element));\n  }\n\n  /** Access injected document if available or fallback to global document reference */\n  private _getDocument(): Document {\n    return this._document || document;\n  }\n\n  /** Use defaultView of injected document if available or fallback to global window reference */\n  private _getWindow(): Window {\n    const doc = this._getDocument();\n    return doc.defaultView || window;\n  }\n\n  private _getFocusOrigin(focusEventTarget: HTMLElement | null): FocusOrigin {\n    if (this._origin) {\n      // If the origin was realized via a touch interaction, we need to perform additional checks\n      // to determine whether the focus origin should be attributed to touch or program.\n      if (this._originFromTouchInteraction) {\n        return this._shouldBeAttributedToTouch(focusEventTarget) ? 'touch' : 'program';\n      } else {\n        return this._origin;\n      }\n    }\n\n    // If the window has just regained focus, we can restore the most recent origin from before the\n    // window blurred. Otherwise, we've reached the point where we can't identify the source of the\n    // focus. This typically means one of two things happened:\n    //\n    // 1) The element was programmatically focused, or\n    // 2) The element was focused via screen reader navigation (which generally doesn't fire\n    //    events).\n    //\n    // Because we can't distinguish between these two cases, we default to setting `program`.\n    if (this._windowFocused && this._lastFocusOrigin) {\n      return this._lastFocusOrigin;\n    }\n\n    // If the interaction is coming from an input label, we consider it a mouse interactions.\n    // This is a special case where focus moves on `click`, rather than `mousedown` which breaks\n    // our detection, because all our assumptions are for `mousedown`. We need to handle this\n    // special case, because it's very common for checkboxes and radio buttons.\n    if (focusEventTarget && this._isLastInteractionFromInputLabel(focusEventTarget)) {\n      return 'mouse';\n    }\n\n    return 'program';\n  }\n\n  /**\n   * Returns whether the focus event should be attributed to touch. Recall that in IMMEDIATE mode, a\n   * touch origin isn't immediately reset at the next tick (see _setOrigin). This means that when we\n   * handle a focus event following a touch interaction, we need to determine whether (1) the focus\n   * event was directly caused by the touch interaction or (2) the focus event was caused by a\n   * subsequent programmatic focus call triggered by the touch interaction.\n   * @param focusEventTarget The target of the focus event under examination.\n   */\n  private _shouldBeAttributedToTouch(focusEventTarget: HTMLElement | null): boolean {\n    // Please note that this check is not perfect. Consider the following edge case:\n    //\n    // <div #parent tabindex=\"0\">\n    //   <div #child tabindex=\"0\" (click)=\"#parent.focus()\"></div>\n    // </div>\n    //\n    // Suppose there is a FocusMonitor in IMMEDIATE mode attached to #parent. When the user touches\n    // #child, #parent is programmatically focused. This code will attribute the focus to touch\n    // instead of program. This is a relatively minor edge-case that can be worked around by using\n    // focusVia(parent, 'program') to focus #parent.\n    return (\n      this._detectionMode === FocusMonitorDetectionMode.EVENTUAL ||\n      !!focusEventTarget?.contains(this._inputModalityDetector._mostRecentTarget)\n    );\n  }\n\n  /**\n   * Sets the focus classes on the element based on the given focus origin.\n   * @param element The element to update the classes on.\n   * @param origin The focus origin.\n   */\n  private _setClasses(element: HTMLElement, origin?: FocusOrigin): void {\n    element.classList.toggle('cdk-focused', !!origin);\n    element.classList.toggle('cdk-touch-focused', origin === 'touch');\n    element.classList.toggle('cdk-keyboard-focused', origin === 'keyboard');\n    element.classList.toggle('cdk-mouse-focused', origin === 'mouse');\n    element.classList.toggle('cdk-program-focused', origin === 'program');\n  }\n\n  /**\n   * Updates the focus origin. If we're using immediate detection mode, we schedule an async\n   * function to clear the origin at the end of a timeout. The duration of the timeout depends on\n   * the origin being set.\n   * @param origin The origin to set.\n   * @param isFromInteraction Whether we are setting the origin from an interaction event.\n   */\n  private _setOrigin(origin: FocusOrigin, isFromInteraction = false): void {\n    this._ngZone.runOutsideAngular(() => {\n      this._origin = origin;\n      this._originFromTouchInteraction = origin === 'touch' && isFromInteraction;\n\n      // If we're in IMMEDIATE mode, reset the origin at the next tick (or in `TOUCH_BUFFER_MS` ms\n      // for a touch event). We reset the origin at the next tick because Firefox focuses one tick\n      // after the interaction event. We wait `TOUCH_BUFFER_MS` ms before resetting the origin for\n      // a touch event because when a touch event is fired, the associated focus event isn't yet in\n      // the event queue. Before doing so, clear any pending timeouts.\n      if (this._detectionMode === FocusMonitorDetectionMode.IMMEDIATE) {\n        clearTimeout(this._originTimeoutId);\n        const ms = this._originFromTouchInteraction ? TOUCH_BUFFER_MS : 1;\n        this._originTimeoutId = setTimeout(() => (this._origin = null), ms);\n      }\n    });\n  }\n\n  /**\n   * Handles focus events on a registered element.\n   * @param event The focus event.\n   * @param element The monitored element.\n   */\n  private _onFocus(event: FocusEvent, element: HTMLElement) {\n    // NOTE(mmalerba): We currently set the classes based on the focus origin of the most recent\n    // focus event affecting the monitored element. If we want to use the origin of the first event\n    // instead we should check for the cdk-focused class here and return if the element already has\n    // it. (This only matters for elements that have includesChildren = true).\n\n    // If we are not counting child-element-focus as focused, make sure that the event target is the\n    // monitored element itself.\n    const elementInfo = this._elementInfo.get(element);\n    const focusEventTarget = _getEventTarget<HTMLElement>(event);\n    if (!elementInfo || (!elementInfo.checkChildren && element !== focusEventTarget)) {\n      return;\n    }\n\n    this._originChanged(element, this._getFocusOrigin(focusEventTarget), elementInfo);\n  }\n\n  /**\n   * Handles blur events on a registered element.\n   * @param event The blur event.\n   * @param element The monitored element.\n   */\n  _onBlur(event: FocusEvent, element: HTMLElement) {\n    // If we are counting child-element-focus as focused, make sure that we aren't just blurring in\n    // order to focus another child of the monitored element.\n    const elementInfo = this._elementInfo.get(element);\n\n    if (\n      !elementInfo ||\n      (elementInfo.checkChildren &&\n        event.relatedTarget instanceof Node &&\n        element.contains(event.relatedTarget))\n    ) {\n      return;\n    }\n\n    this._setClasses(element);\n    this._emitOrigin(elementInfo, null);\n  }\n\n  private _emitOrigin(info: MonitoredElementInfo, origin: FocusOrigin) {\n    if (info.subject.observers.length) {\n      this._ngZone.run(() => info.subject.next(origin));\n    }\n  }\n\n  private _registerGlobalListeners(elementInfo: MonitoredElementInfo) {\n    if (!this._platform.isBrowser) {\n      return;\n    }\n\n    const rootNode = elementInfo.rootNode;\n    const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode) || 0;\n\n    if (!rootNodeFocusListeners) {\n      this._ngZone.runOutsideAngular(() => {\n        rootNode.addEventListener(\n          'focus',\n          this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions,\n        );\n        rootNode.addEventListener(\n          'blur',\n          this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions,\n        );\n      });\n    }\n\n    this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners + 1);\n\n    // Register global listeners when first element is monitored.\n    if (++this._monitoredElementCount === 1) {\n      // Note: we listen to events in the capture phase so we\n      // can detect them even if the user stops propagation.\n      this._ngZone.runOutsideAngular(() => {\n        const window = this._getWindow();\n        window.addEventListener('focus', this._windowFocusListener);\n      });\n\n      // The InputModalityDetector is also just a collection of global listeners.\n      this._inputModalityDetector.modalityDetected\n        .pipe(takeUntil(this._stopInputModalityDetector))\n        .subscribe(modality => {\n          this._setOrigin(modality, true /* isFromInteraction */);\n        });\n    }\n  }\n\n  private _removeGlobalListeners(elementInfo: MonitoredElementInfo) {\n    const rootNode = elementInfo.rootNode;\n\n    if (this._rootNodeFocusListenerCount.has(rootNode)) {\n      const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode)!;\n\n      if (rootNodeFocusListeners > 1) {\n        this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners - 1);\n      } else {\n        rootNode.removeEventListener(\n          'focus',\n          this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions,\n        );\n        rootNode.removeEventListener(\n          'blur',\n          this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions,\n        );\n        this._rootNodeFocusListenerCount.delete(rootNode);\n      }\n    }\n\n    // Unregister global listeners when last element is unmonitored.\n    if (!--this._monitoredElementCount) {\n      const window = this._getWindow();\n      window.removeEventListener('focus', this._windowFocusListener);\n\n      // Equivalently, stop our InputModalityDetector subscription.\n      this._stopInputModalityDetector.next();\n\n      // Clear timeouts for all potentially pending timeouts to prevent the leaks.\n      clearTimeout(this._windowFocusTimeoutId);\n      clearTimeout(this._originTimeoutId);\n    }\n  }\n\n  /** Updates all the state on an element once its focus origin has changed. */\n  private _originChanged(\n    element: HTMLElement,\n    origin: FocusOrigin,\n    elementInfo: MonitoredElementInfo,\n  ) {\n    this._setClasses(element, origin);\n    this._emitOrigin(elementInfo, origin);\n    this._lastFocusOrigin = origin;\n  }\n\n  /**\n   * Collects the `MonitoredElementInfo` of a particular element and\n   * all of its ancestors that have enabled `checkChildren`.\n   * @param element Element from which to start the search.\n   */\n  private _getClosestElementsInfo(element: HTMLElement): [HTMLElement, MonitoredElementInfo][] {\n    const results: [HTMLElement, MonitoredElementInfo][] = [];\n\n    this._elementInfo.forEach((info, currentElement) => {\n      if (currentElement === element || (info.checkChildren && currentElement.contains(element))) {\n        results.push([currentElement, info]);\n      }\n    });\n\n    return results;\n  }\n\n  /**\n   * Returns whether an interaction is likely to have come from the user clicking the `label` of\n   * an `input` or `textarea` in order to focus it.\n   * @param focusEventTarget Target currently receiving focus.\n   */\n  private _isLastInteractionFromInputLabel(focusEventTarget: HTMLElement): boolean {\n    const {_mostRecentTarget: mostRecentTarget, mostRecentModality} = this._inputModalityDetector;\n\n    // If the last interaction used the mouse on an element contained by one of the labels\n    // of an `input`/`textarea` that is currently focused, it is very likely that the\n    // user redirected focus using the label.\n    if (\n      mostRecentModality !== 'mouse' ||\n      !mostRecentTarget ||\n      mostRecentTarget === focusEventTarget ||\n      (focusEventTarget.nodeName !== 'INPUT' && focusEventTarget.nodeName !== 'TEXTAREA') ||\n      (focusEventTarget as HTMLInputElement | HTMLTextAreaElement).disabled\n    ) {\n      return false;\n    }\n\n    const labels = (focusEventTarget as HTMLInputElement | HTMLTextAreaElement).labels;\n\n    if (labels) {\n      for (let i = 0; i < labels.length; i++) {\n        if (labels[i].contains(mostRecentTarget)) {\n          return true;\n        }\n      }\n    }\n\n    return false;\n  }\n}\n\n/**\n * Directive that determines how a particular element was focused (via keyboard, mouse, touch, or\n * programmatically) and adds corresponding classes to the element.\n *\n * There are two variants of this directive:\n * 1) cdkMonitorElementFocus: does not consider an element to be focused if one of its children is\n *    focused.\n * 2) cdkMonitorSubtreeFocus: considers an element focused if it or any of its children are focused.\n */\n@Directive({\n  selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',\n  exportAs: 'cdkMonitorFocus',\n})\nexport class CdkMonitorFocus implements AfterViewInit, OnDestroy {\n  private _monitorSubscription: Subscription;\n  private _focusOrigin: FocusOrigin = null;\n\n  @Output() readonly cdkFocusChange = new EventEmitter<FocusOrigin>();\n\n  constructor(private _elementRef: ElementRef<HTMLElement>, private _focusMonitor: FocusMonitor) {}\n\n  get focusOrigin(): FocusOrigin {\n    return this._focusOrigin;\n  }\n\n  ngAfterViewInit() {\n    const element = this._elementRef.nativeElement;\n    this._monitorSubscription = this._focusMonitor\n      .monitor(element, element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))\n      .subscribe(origin => {\n        this._focusOrigin = origin;\n        this.cdkFocusChange.emit(origin);\n      });\n  }\n\n  ngOnDestroy() {\n    this._focusMonitor.stopMonitoring(this._elementRef);\n\n    if (this._monitorSubscription) {\n      this._monitorSubscription.unsubscribe();\n    }\n  }\n}\n"]}