@angular/cdk
Version:
Angular Material Component Development Kit
420 lines • 67.3 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 } 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 { coerceElement } from '@angular/cdk/coercion';
import { DOCUMENT } from '@angular/common';
import { isFakeMousedownFromScreenReader } from '../fake-mousedown';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/platform";
import * as i2 from "@angular/common";
// This is the value used by AngularJS Material. Through trial and error (on iPhone 6S) they found
// that a value of around 650ms seems appropriate.
export const TOUCH_BUFFER_MS = 650;
/** 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. */
export class FocusMonitor {
constructor(_ngZone, _platform,
/** @breaking-change 11.0.0 make document required */
document, options) {
this._ngZone = _ngZone;
this._platform = _platform;
/** 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;
/** 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 `keydown` events on the document.
* Needs to be an arrow function in order to preserve the context when it gets bound.
*/
this._documentKeydownListener = () => {
// On keydown record the origin and clear any touch event that may be in progress.
this._lastTouchTarget = null;
this._setOriginForCurrentEventQueue('keyboard');
};
/**
* Event listener for `mousedown` events on the document.
* Needs to be an arrow function in order to preserve the context when it gets bound.
*/
this._documentMousedownListener = (event) => {
// On mousedown record the origin only if there is not touch
// target, since a mousedown can happen as a result of a touch event.
if (!this._lastTouchTarget) {
// In some cases screen readers fire fake `mousedown` events instead of `keydown`.
// Resolve the focus source to `keyboard` if we detect one of them.
const source = isFakeMousedownFromScreenReader(event) ? 'keyboard' : 'mouse';
this._setOriginForCurrentEventQueue(source);
}
};
/**
* Event listener for `touchstart` events on the document.
* Needs to be an arrow function in order to preserve the context when it gets bound.
*/
this._documentTouchstartListener = (event) => {
// When the touchstart event fires the focus event is not yet in the event queue. This means
// we can't rely on the trick used above (setting timeout of 1ms). Instead we wait 650ms to
// see if a focus happens.
if (this._touchTimeoutId != null) {
clearTimeout(this._touchTimeoutId);
}
this._lastTouchTarget = getTarget(event);
this._touchTimeoutId = setTimeout(() => this._lastTouchTarget = null, TOUCH_BUFFER_MS);
};
/**
* 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 = setTimeout(() => this._windowFocused = false);
};
/**
* 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 = getTarget(event);
const handler = event.type === 'focus' ? this._onFocus : this._onBlur;
// We need to walk up the ancestor chain in order to support `checkChildren`.
for (let element = target; element; element = element.parentElement) {
handler.call(this, event, element);
}
};
this._document = document;
this._detectionMode = (options === null || options === void 0 ? void 0 : options.detectionMode) || 0 /* 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._elementInfo.has(nativeElement)) {
this._originChanged(nativeElement, origin, this._elementInfo.get(nativeElement));
}
else {
this._setOriginForCurrentEventQueue(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;
}
_toggleClass(element, className, shouldSet) {
if (shouldSet) {
element.classList.add(className);
}
else {
element.classList.remove(className);
}
}
_getFocusOrigin(event) {
// If we couldn't detect a cause for the focus event, it's due to one of three reasons:
// 1) The window has just regained focus, in which case we want to restore the focused state of
// the element from before the window blurred.
// 2) It was caused by a touch event, in which case we mark the origin as 'touch'.
// 3) The element was programmatically focused, in which case we should mark the origin as
// 'program'.
if (this._origin) {
return this._origin;
}
if (this._windowFocused && this._lastFocusOrigin) {
return this._lastFocusOrigin;
}
else if (this._wasCausedByTouch(event)) {
return 'touch';
}
else {
return 'program';
}
}
/**
* 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) {
this._toggleClass(element, 'cdk-focused', !!origin);
this._toggleClass(element, 'cdk-touch-focused', origin === 'touch');
this._toggleClass(element, 'cdk-keyboard-focused', origin === 'keyboard');
this._toggleClass(element, 'cdk-mouse-focused', origin === 'mouse');
this._toggleClass(element, 'cdk-program-focused', origin === 'program');
}
/**
* Sets the origin and schedules an async function to clear it at the end of the event queue.
* If the detection mode is 'eventual', the origin is never cleared.
* @param origin The origin to set.
*/
_setOriginForCurrentEventQueue(origin) {
this._ngZone.runOutsideAngular(() => {
this._origin = origin;
if (this._detectionMode === 0 /* IMMEDIATE */) {
// Sometimes the focus origin won't be valid in Firefox because Firefox seems to focus *one*
// tick after the interaction event fired. To ensure the focus origin is always correct,
// the focus origin will be determined at the beginning of the next tick.
this._originTimeoutId = setTimeout(() => this._origin = null, 1);
}
});
}
/**
* Checks whether the given focus event was caused by a touchstart event.
* @param event The focus event to check.
* @returns Whether the event was caused by a touch.
*/
_wasCausedByTouch(event) {
// Note(mmalerba): This implementation is not quite perfect, there is a small edge case.
// Consider the following dom structure:
//
// <div #parent tabindex="0" cdkFocusClasses>
// <div #child (click)="#parent.focus()"></div>
// </div>
//
// If the user touches the #child element and the #parent is programmatically focused as a
// result, this code will still consider it to have been caused by the touch event and will
// apply the cdk-touch-focused class rather than the cdk-program-focused class. This is a
// relatively small edge-case that can be worked around by using
// focusVia(parentEl, 'program') to focus the parent element.
//
// If we decide that we absolutely must handle this case correctly, we can do so by listening
// for the first focus event after the touchstart, and then the first blur event after that
// focus event. When that blur event fires we know that whatever follows is not a result of the
// touchstart.
const focusTarget = getTarget(event);
return this._lastTouchTarget instanceof Node && focusTarget instanceof Node &&
(focusTarget === this._lastTouchTarget || focusTarget.contains(this._lastTouchTarget));
}
/**
* 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);
if (!elementInfo || (!elementInfo.checkChildren && element !== getTarget(event))) {
return;
}
this._originChanged(element, this._getFocusOrigin(event), 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.subject, null);
}
_emitOrigin(subject, origin) {
this._ngZone.run(() => 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 document = this._getDocument();
const window = this._getWindow();
document.addEventListener('keydown', this._documentKeydownListener, captureEventListenerOptions);
document.addEventListener('mousedown', this._documentMousedownListener, captureEventListenerOptions);
document.addEventListener('touchstart', this._documentTouchstartListener, captureEventListenerOptions);
window.addEventListener('focus', this._windowFocusListener);
});
}
}
_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 document = this._getDocument();
const window = this._getWindow();
document.removeEventListener('keydown', this._documentKeydownListener, captureEventListenerOptions);
document.removeEventListener('mousedown', this._documentMousedownListener, captureEventListenerOptions);
document.removeEventListener('touchstart', this._documentTouchstartListener, captureEventListenerOptions);
window.removeEventListener('focus', this._windowFocusListener);
// Clear timeouts for all potentially pending timeouts to prevent the leaks.
clearTimeout(this._windowFocusTimeoutId);
clearTimeout(this._touchTimeoutId);
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.subject, origin);
this._lastFocusOrigin = origin;
}
}
FocusMonitor.ɵprov = i0.ɵɵdefineInjectable({ factory: function FocusMonitor_Factory() { return new FocusMonitor(i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(i1.Platform), i0.ɵɵinject(i2.DOCUMENT, 8), i0.ɵɵinject(FOCUS_MONITOR_DEFAULT_OPTIONS, 8)); }, token: FocusMonitor, providedIn: "root" });
FocusMonitor.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
FocusMonitor.ctorParameters = () => [
{ type: NgZone },
{ type: Platform },
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] },
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [FOCUS_MONITOR_DEFAULT_OPTIONS,] }] }
];
/** Gets the target of an event, accounting for Shadow DOM. */
function getTarget(event) {
// If an event is bound outside the Shadow DOM, the `event.target` will
// point to the shadow root so we have to use `composedPath` instead.
return (event.composedPath ? event.composedPath()[0] : event.target);
}
/**
* 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.
*/
export class CdkMonitorFocus {
constructor(_elementRef, _focusMonitor) {
this._elementRef = _elementRef;
this._focusMonitor = _focusMonitor;
this.cdkFocusChange = new EventEmitter();
}
ngAfterViewInit() {
const element = this._elementRef.nativeElement;
this._monitorSubscription = this._focusMonitor.monitor(element, element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))
.subscribe(origin => this.cdkFocusChange.emit(origin));
}
ngOnDestroy() {
this._focusMonitor.stopMonitoring(this._elementRef);
if (this._monitorSubscription) {
this._monitorSubscription.unsubscribe();
}
}
}
CdkMonitorFocus.decorators = [
{ type: Directive, args: [{
selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',
},] }
];
CdkMonitorFocus.ctorParameters = () => [
{ type: ElementRef },
{ type: FocusMonitor }
];
CdkMonitorFocus.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 {Platform, normalizePassiveListenerOptions, _getShadowRoot} 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 {coerceElement} from '@angular/cdk/coercion';\nimport {DOCUMENT} from '@angular/common';\nimport {isFakeMousedownFromScreenReader} from '../fake-mousedown';\n\n\n// This is the value used by AngularJS Material. Through trial and error (on iPhone 6S) they found\n// that a value of around 650ms seems appropriate.\nexport const TOUCH_BUFFER_MS = 650;\n\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 occured.\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 =\n    new InjectionToken<FocusMonitorOptions>('cdk-focus-monitor-default-options');\n\ntype MonitoredElementInfo = {\n  checkChildren: boolean,\n  subject: Subject<FocusOrigin>,\n  rootNode: HTMLElement|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\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 target of the last touch event. */\n  private _lastTouchTarget: EventTarget | null;\n\n  /** The timeout id of the touch timeout, used to cancel timeout later. */\n  private _touchTimeoutId: number;\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  /** 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, 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 `keydown` events on the document.\n   * Needs to be an arrow function in order to preserve the context when it gets bound.\n   */\n  private _documentKeydownListener = () => {\n    // On keydown record the origin and clear any touch event that may be in progress.\n    this._lastTouchTarget = null;\n    this._setOriginForCurrentEventQueue('keyboard');\n  }\n\n  /**\n   * Event listener for `mousedown` events on the document.\n   * Needs to be an arrow function in order to preserve the context when it gets bound.\n   */\n  private _documentMousedownListener = (event: MouseEvent) => {\n    // On mousedown record the origin only if there is not touch\n    // target, since a mousedown can happen as a result of a touch event.\n    if (!this._lastTouchTarget) {\n      // In some cases screen readers fire fake `mousedown` events instead of `keydown`.\n      // Resolve the focus source to `keyboard` if we detect one of them.\n      const source = isFakeMousedownFromScreenReader(event) ? 'keyboard' : 'mouse';\n      this._setOriginForCurrentEventQueue(source);\n    }\n  }\n\n  /**\n   * Event listener for `touchstart` events on the document.\n   * Needs to be an arrow function in order to preserve the context when it gets bound.\n   */\n  private _documentTouchstartListener = (event: TouchEvent) => {\n    // When the touchstart event fires the focus event is not yet in the event queue. This means\n    // we can't rely on the trick used above (setting timeout of 1ms). Instead we wait 650ms to\n    // see if a focus happens.\n    if (this._touchTimeoutId != null) {\n      clearTimeout(this._touchTimeoutId);\n    }\n\n    this._lastTouchTarget = getTarget(event);\n    this._touchTimeoutId = setTimeout(() => this._lastTouchTarget = null, TOUCH_BUFFER_MS);\n  }\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 = setTimeout(() => this._windowFocused = false);\n  }\n\n  /** Used to reference correct document/window */\n  protected _document?: Document;\n\n  constructor(\n      private _ngZone: NgZone,\n      private _platform: Platform,\n      /** @breaking-change 11.0.0 make document required */\n      @Optional() @Inject(DOCUMENT) document: any|null,\n      @Optional() @Inject(FOCUS_MONITOR_DEFAULT_OPTIONS) options:\n          FocusMonitorOptions|null) {\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 = getTarget(event);\n    const handler = event.type === 'focus' ? this._onFocus : this._onBlur;\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      handler.call(this, event as FocusEvent, element);\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(element: HTMLElement | ElementRef<HTMLElement>,\n          checkChildren: boolean = false): 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) as HTMLElement|null) || 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(element: HTMLElement | ElementRef<HTMLElement>,\n          origin: FocusOrigin,\n          options?: FocusOptions): void {\n\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 && this._elementInfo.has(nativeElement)) {\n      this._originChanged(nativeElement, origin, this._elementInfo.get(nativeElement)!);\n    } else {\n      this._setOriginForCurrentEventQueue(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 _toggleClass(element: Element, className: string, shouldSet: boolean) {\n    if (shouldSet) {\n      element.classList.add(className);\n    } else {\n      element.classList.remove(className);\n    }\n  }\n\n  private _getFocusOrigin(event: FocusEvent): FocusOrigin {\n    // If we couldn't detect a cause for the focus event, it's due to one of three reasons:\n    // 1) The window has just regained focus, in which case we want to restore the focused state of\n    //    the element from before the window blurred.\n    // 2) It was caused by a touch event, in which case we mark the origin as 'touch'.\n    // 3) The element was programmatically focused, in which case we should mark the origin as\n    //    'program'.\n    if (this._origin) {\n      return this._origin;\n    }\n\n    if (this._windowFocused && this._lastFocusOrigin) {\n      return this._lastFocusOrigin;\n    } else if (this._wasCausedByTouch(event)) {\n      return 'touch';\n    } else {\n      return 'program';\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    this._toggleClass(element, 'cdk-focused', !!origin);\n    this._toggleClass(element, 'cdk-touch-focused', origin === 'touch');\n    this._toggleClass(element, 'cdk-keyboard-focused', origin === 'keyboard');\n    this._toggleClass(element, 'cdk-mouse-focused', origin === 'mouse');\n    this._toggleClass(element, 'cdk-program-focused', origin === 'program');\n  }\n\n  /**\n   * Sets the origin and schedules an async function to clear it at the end of the event queue.\n   * If the detection mode is 'eventual', the origin is never cleared.\n   * @param origin The origin to set.\n   */\n  private _setOriginForCurrentEventQueue(origin: FocusOrigin): void {\n    this._ngZone.runOutsideAngular(() => {\n      this._origin = origin;\n\n      if (this._detectionMode === FocusMonitorDetectionMode.IMMEDIATE) {\n        // Sometimes the focus origin won't be valid in Firefox because Firefox seems to focus *one*\n        // tick after the interaction event fired. To ensure the focus origin is always correct,\n        // the focus origin will be determined at the beginning of the next tick.\n        this._originTimeoutId = setTimeout(() => this._origin = null, 1);\n      }\n    });\n  }\n\n  /**\n   * Checks whether the given focus event was caused by a touchstart event.\n   * @param event The focus event to check.\n   * @returns Whether the event was caused by a touch.\n   */\n  private _wasCausedByTouch(event: FocusEvent): boolean {\n    // Note(mmalerba): This implementation is not quite perfect, there is a small edge case.\n    // Consider the following dom structure:\n    //\n    // <div #parent tabindex=\"0\" cdkFocusClasses>\n    //   <div #child (click)=\"#parent.focus()\"></div>\n    // </div>\n    //\n    // If the user touches the #child element and the #parent is programmatically focused as a\n    // result, this code will still consider it to have been caused by the touch event and will\n    // apply the cdk-touch-focused class rather than the cdk-program-focused class. This is a\n    // relatively small edge-case that can be worked around by using\n    // focusVia(parentEl, 'program') to focus the parent element.\n    //\n    // If we decide that we absolutely must handle this case correctly, we can do so by listening\n    // for the first focus event after the touchstart, and then the first blur event after that\n    // focus event. When that blur event fires we know that whatever follows is not a result of the\n    // touchstart.\n    const focusTarget = getTarget(event);\n    return this._lastTouchTarget instanceof Node && focusTarget instanceof Node &&\n        (focusTarget === this._lastTouchTarget || focusTarget.contains(this._lastTouchTarget));\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    if (!elementInfo || (!elementInfo.checkChildren && element !== getTarget(event))) {\n      return;\n    }\n\n    this._originChanged(element, this._getFocusOrigin(event), 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 (!elementInfo || (elementInfo.checkChildren && event.relatedTarget instanceof Node &&\n        element.contains(event.relatedTarget))) {\n      return;\n    }\n\n    this._setClasses(element);\n    this._emitOrigin(elementInfo.subject, null);\n  }\n\n  private _emitOrigin(subject: Subject<FocusOrigin>, origin: FocusOrigin) {\n    this._ngZone.run(() => subject.next(origin));\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('focus', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n        rootNode.addEventListener('blur', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\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 document = this._getDocument();\n        const window = this._getWindow();\n\n        document.addEventListener('keydown', this._documentKeydownListener,\n          captureEventListenerOptions);\n        document.addEventListener('mousedown', this._documentMousedownListener,\n          captureEventListenerOptions);\n        document.addEventListener('touchstart', this._documentTouchstartListener,\n          captureEventListenerOptions);\n        window.addEventListener('focus', this._windowFocusListener);\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('focus', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n        rootNode.removeEventListener('blur', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n        this._rootNodeFocusListenerCount.delete(rootNode);\n      }\n    }\n\n    // Unregister global listeners when last element is unmonitored.\n    if (!--this._monitoredElementCount) {\n      const document = this._getDocument();\n      const window = this._getWindow();\n\n      document.removeEventListener('keydown', this._documentKeydownListener,\n        captureEventListenerOptions);\n      document.removeEventListener('mousedown', this._documentMousedownListener,\n        captureEventListenerOptions);\n      document.removeEventListener('touchstart', this._documentTouchstartListener,\n        captureEventListenerOptions);\n      window.removeEventListener('focus', this._windowFocusListener);\n\n      // Clear timeouts for all potentially pending timeouts to prevent the leaks.\n      clearTimeout(this._windowFocusTimeoutId);\n      clearTimeout(this._touchTimeoutId);\n      clearTimeout(this._originTimeoutId);\n    }\n  }\n\n  /** Updates all the state on an element once its focus origin has changed. */\n  private _originChanged(element: HTMLElement, origin: FocusOrigin,\n                         elementInfo: MonitoredElementInfo) {\n    this._setClasses(element, origin);\n    this._emitOrigin(elementInfo.subject, origin);\n    this._lastFocusOrigin = origin;\n  }\n}\n\n/** Gets the target of an event, accounting for Shadow DOM. */\nfunction getTarget(event: Event): HTMLElement|null {\n  // If an event is bound outside the Shadow DOM, the `event.target` will\n  // point to the shadow root so we have to use `composedPath` instead.\n  return (event.composedPath ? event.composedPath()[0] : event.target) as HTMLElement | null;\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})\nexport class CdkMonitorFocus implements AfterViewInit, OnDestroy {\n  private _monitorSubscription: Subscription;\n  @Output() cdkFocusChange = new EventEmitter<FocusOrigin>();\n\n  constructor(private _elementRef: ElementRef<HTMLElement>, private _focusMonitor: FocusMonitor) {}\n\n  ngAfterViewInit() {\n    const element = this._elementRef.nativeElement;\n    this._monitorSubscription = this._focusMonitor.monitor(\n      element,\n      element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))\n    .subscribe(origin => this.cdkFocusChange.emit(origin));\n  }\n\n  ngOnDestroy() {\n    this._focusMonitor.stopMonitoring(this._elementRef);\n\n    if (this._monitorSubscription) {\n      this._monitorSubscription.unsubscribe();\n    }\n  }\n}\n"]}