@angular/cdk
Version:
Angular Material Component Development Kit
345 lines • 52.9 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 } from '@angular/cdk/platform';
import { Directive, ElementRef, EventEmitter, Injectable, NgZone, Output, } from '@angular/core';
import { of as observableOf, Subject } from 'rxjs';
import { coerceElement } from '@angular/cdk/coercion';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/platform";
// 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 var TOUCH_BUFFER_MS = 650;
/**
* Event listener options that enable capturing and also
* mark the listener as passive if the browser supports it.
*/
var captureEventListenerOptions = normalizePassiveListenerOptions({
passive: true,
capture: true
});
/** Monitors mouse and keyboard events to determine the cause of focus events. */
var FocusMonitor = /** @class */ (function () {
function FocusMonitor(_ngZone, _platform) {
var _this = this;
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;
/**
* 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 = function () {
// 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 = function () {
// 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) {
_this._setOriginForCurrentEventQueue('mouse');
}
};
/**
* 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 = function (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);
}
// Since this listener is bound on the `document` level, any events coming from the shadow DOM
// will have their `target` set to the shadow root. If available, use `composedPath` to
// figure out the event target.
_this._lastTouchTarget = event.composedPath ? event.composedPath()[0] : event.target;
_this._touchTimeoutId = setTimeout(function () { return _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 = function () {
// 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(function () { return _this._windowFocused = false; });
};
}
FocusMonitor.prototype.monitor = function (element, checkChildren) {
var _this = this;
if (checkChildren === void 0) { checkChildren = false; }
// Do nothing if we're not on the browser platform.
if (!this._platform.isBrowser) {
return observableOf(null);
}
var nativeElement = coerceElement(element);
// Check if we're already monitoring this element.
if (this._elementInfo.has(nativeElement)) {
var cachedInfo = this._elementInfo.get(nativeElement);
cachedInfo.checkChildren = checkChildren;
return cachedInfo.subject.asObservable();
}
// Create monitored element info.
var info = {
unlisten: function () { },
checkChildren: checkChildren,
subject: new Subject()
};
this._elementInfo.set(nativeElement, info);
this._incrementMonitoredElementCount();
// Start listening. We need to listen in capture phase since focus events don't bubble.
var focusListener = function (event) { return _this._onFocus(event, nativeElement); };
var blurListener = function (event) { return _this._onBlur(event, nativeElement); };
this._ngZone.runOutsideAngular(function () {
nativeElement.addEventListener('focus', focusListener, true);
nativeElement.addEventListener('blur', blurListener, true);
});
// Create an unlisten function for later.
info.unlisten = function () {
nativeElement.removeEventListener('focus', focusListener, true);
nativeElement.removeEventListener('blur', blurListener, true);
};
return info.subject.asObservable();
};
FocusMonitor.prototype.stopMonitoring = function (element) {
var nativeElement = coerceElement(element);
var elementInfo = this._elementInfo.get(nativeElement);
if (elementInfo) {
elementInfo.unlisten();
elementInfo.subject.complete();
this._setClasses(nativeElement);
this._elementInfo.delete(nativeElement);
this._decrementMonitoredElementCount();
}
};
FocusMonitor.prototype.focusVia = function (element, origin, options) {
var nativeElement = coerceElement(element);
this._setOriginForCurrentEventQueue(origin);
// `focus` isn't available on the server
if (typeof nativeElement.focus === 'function') {
// Cast the element to `any`, because the TS typings don't have the `options` parameter yet.
nativeElement.focus(options);
}
};
FocusMonitor.prototype.ngOnDestroy = function () {
var _this = this;
this._elementInfo.forEach(function (_info, element) { return _this.stopMonitoring(element); });
};
FocusMonitor.prototype._toggleClass = function (element, className, shouldSet) {
if (shouldSet) {
element.classList.add(className);
}
else {
element.classList.remove(className);
}
};
/**
* 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.
*/
FocusMonitor.prototype._setClasses = function (element, origin) {
var elementInfo = this._elementInfo.get(element);
if (elementInfo) {
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.
* @param origin The origin to set.
*/
FocusMonitor.prototype._setOriginForCurrentEventQueue = function (origin) {
var _this = this;
this._ngZone.runOutsideAngular(function () {
_this._origin = origin;
// 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(function () { return _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.
*/
FocusMonitor.prototype._wasCausedByTouch = function (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.
var focusTarget = event.target;
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.
*/
FocusMonitor.prototype._onFocus = function (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.
var elementInfo = this._elementInfo.get(element);
if (!elementInfo || (!elementInfo.checkChildren && element !== event.target)) {
return;
}
// 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'.
var origin = this._origin;
if (!origin) {
if (this._windowFocused && this._lastFocusOrigin) {
origin = this._lastFocusOrigin;
}
else if (this._wasCausedByTouch(event)) {
origin = 'touch';
}
else {
origin = 'program';
}
}
this._setClasses(element, origin);
this._emitOrigin(elementInfo.subject, origin);
this._lastFocusOrigin = origin;
};
/**
* Handles blur events on a registered element.
* @param event The blur event.
* @param element The monitored element.
*/
FocusMonitor.prototype._onBlur = function (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.
var 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);
};
FocusMonitor.prototype._emitOrigin = function (subject, origin) {
this._ngZone.run(function () { return subject.next(origin); });
};
FocusMonitor.prototype._incrementMonitoredElementCount = function () {
var _this = this;
// Register global listeners when first element is monitored.
if (++this._monitoredElementCount == 1 && this._platform.isBrowser) {
// Note: we listen to events in the capture phase so we
// can detect them even if the user stops propagation.
this._ngZone.runOutsideAngular(function () {
document.addEventListener('keydown', _this._documentKeydownListener, captureEventListenerOptions);
document.addEventListener('mousedown', _this._documentMousedownListener, captureEventListenerOptions);
document.addEventListener('touchstart', _this._documentTouchstartListener, captureEventListenerOptions);
window.addEventListener('focus', _this._windowFocusListener);
});
}
};
FocusMonitor.prototype._decrementMonitoredElementCount = function () {
// Unregister global listeners when last element is unmonitored.
if (!--this._monitoredElementCount) {
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);
}
};
FocusMonitor.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
/** @nocollapse */
FocusMonitor.ctorParameters = function () { return [
{ type: NgZone },
{ type: Platform }
]; };
FocusMonitor.ɵprov = i0.ɵɵdefineInjectable({ factory: function FocusMonitor_Factory() { return new FocusMonitor(i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(i1.Platform)); }, token: FocusMonitor, providedIn: "root" });
return FocusMonitor;
}());
export { FocusMonitor };
/**
* 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.
*/
var CdkMonitorFocus = /** @class */ (function () {
function CdkMonitorFocus(_elementRef, _focusMonitor) {
var _this = this;
this._elementRef = _elementRef;
this._focusMonitor = _focusMonitor;
this.cdkFocusChange = new EventEmitter();
this._monitorSubscription = this._focusMonitor.monitor(this._elementRef, this._elementRef.nativeElement.hasAttribute('cdkMonitorSubtreeFocus'))
.subscribe(function (origin) { return _this.cdkFocusChange.emit(origin); });
}
CdkMonitorFocus.prototype.ngOnDestroy = function () {
this._focusMonitor.stopMonitoring(this._elementRef);
this._monitorSubscription.unsubscribe();
};
CdkMonitorFocus.decorators = [
{ type: Directive, args: [{
selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',
},] }
];
/** @nocollapse */
CdkMonitorFocus.ctorParameters = function () { return [
{ type: ElementRef },
{ type: FocusMonitor }
]; };
CdkMonitorFocus.propDecorators = {
cdkFocusChange: [{ type: Output }]
};
return CdkMonitorFocus;
}());
export { CdkMonitorFocus };
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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} from '@angular/cdk/platform';\nimport {\n  Directive,\n  ElementRef,\n  EventEmitter,\n  Injectable,\n  NgZone,\n  OnDestroy,\n  Output,\n} from '@angular/core';\nimport {Observable, of as observableOf, Subject, Subscription} from 'rxjs';\nimport {coerceElement} from '@angular/cdk/coercion';\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\ntype MonitoredElementInfo = {\n  unlisten: Function,\n  checkChildren: boolean,\n  subject: Subject<FocusOrigin>\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   * 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 = () => {\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      this._setOriginForCurrentEventQueue('mouse');\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    // Since this listener is bound on the `document` level, any events coming from the shadow DOM\n    // will have their `target` set to the shadow root. If available, use `composedPath` to\n    // figure out the event target.\n    this._lastTouchTarget = event.composedPath ? event.composedPath()[0] : event.target;\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  constructor(private _ngZone: NgZone, private _platform: Platform) {}\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    // Do nothing if we're not on the browser platform.\n    if (!this._platform.isBrowser) {\n      return observableOf(null);\n    }\n\n    const nativeElement = coerceElement(element);\n\n    // Check if we're already monitoring this element.\n    if (this._elementInfo.has(nativeElement)) {\n      let cachedInfo = this._elementInfo.get(nativeElement);\n      cachedInfo!.checkChildren = checkChildren;\n      return cachedInfo!.subject.asObservable();\n    }\n\n    // Create monitored element info.\n    let info: MonitoredElementInfo = {\n      unlisten: () => {},\n      checkChildren: checkChildren,\n      subject: new Subject<FocusOrigin>()\n    };\n    this._elementInfo.set(nativeElement, info);\n    this._incrementMonitoredElementCount();\n\n    // Start listening. We need to listen in capture phase since focus events don't bubble.\n    let focusListener = (event: FocusEvent) => this._onFocus(event, nativeElement);\n    let blurListener = (event: FocusEvent) => this._onBlur(event, nativeElement);\n    this._ngZone.runOutsideAngular(() => {\n      nativeElement.addEventListener('focus', focusListener, true);\n      nativeElement.addEventListener('blur', blurListener, true);\n    });\n\n    // Create an unlisten function for later.\n    info.unlisten = () => {\n      nativeElement.removeEventListener('focus', focusListener, true);\n      nativeElement.removeEventListener('blur', blurListener, true);\n    };\n\n    return info.subject.asObservable();\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.unlisten();\n      elementInfo.subject.complete();\n\n      this._setClasses(nativeElement);\n      this._elementInfo.delete(nativeElement);\n      this._decrementMonitoredElementCount();\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\n    this._setOriginForCurrentEventQueue(origin);\n\n    // `focus` isn't available on the server\n    if (typeof nativeElement.focus === 'function') {\n      // Cast the element to `any`, because the TS typings don't have the `options` parameter yet.\n      (nativeElement as any).focus(options);\n    }\n  }\n\n  ngOnDestroy() {\n    this._elementInfo.forEach((_info, element) => this.stopMonitoring(element));\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  /**\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    const elementInfo = this._elementInfo.get(element);\n\n    if (elementInfo) {\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  /**\n   * Sets the origin and schedules an async function to clear it at the end of the event queue.\n   * @param origin The origin to set.\n   */\n  private _setOriginForCurrentEventQueue(origin: FocusOrigin): void {\n    this._ngZone.runOutsideAngular(() => {\n      this._origin = origin;\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   * 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    let focusTarget = event.target;\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 !== event.target)) {\n      return;\n    }\n\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    let origin = this._origin;\n    if (!origin) {\n      if (this._windowFocused && this._lastFocusOrigin) {\n        origin = this._lastFocusOrigin;\n      } else if (this._wasCausedByTouch(event)) {\n        origin = 'touch';\n      } else {\n        origin = 'program';\n      }\n    }\n\n    this._setClasses(element, origin);\n    this._emitOrigin(elementInfo.subject, origin);\n    this._lastFocusOrigin = origin;\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 _incrementMonitoredElementCount() {\n    // Register global listeners when first element is monitored.\n    if (++this._monitoredElementCount == 1 && this._platform.isBrowser) {\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        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 _decrementMonitoredElementCount() {\n    // Unregister global listeners when last element is unmonitored.\n    if (!--this._monitoredElementCount) {\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\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 OnDestroy {\n  private _monitorSubscription: Subscription;\n  @Output() cdkFocusChange = new EventEmitter<FocusOrigin>();\n\n  constructor(private _elementRef: ElementRef<HTMLElement>, private _focusMonitor: FocusMonitor) {\n    this._monitorSubscription = this._focusMonitor.monitor(\n        this._elementRef,\n        this._elementRef.nativeElement.hasAttribute('cdkMonitorSubtreeFocus'))\n        .subscribe(origin => this.cdkFocusChange.emit(origin));\n  }\n\n  ngOnDestroy() {\n    this._focusMonitor.stopMonitoring(this._elementRef);\n    this._monitorSubscription.unsubscribe();\n  }\n}\n"]}