{"version":3,"file":"focus-monitor-DLjkiju1.mjs","sources":["../../../../../darwin_arm64-fastbuild-ST-46c76129e412/bin/src/cdk/a11y/input-modality/input-modality-detector.ts","../../../../../darwin_arm64-fastbuild-ST-46c76129e412/bin/src/cdk/a11y/focus-monitor/focus-monitor.ts"],"sourcesContent":["/**\n * @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.dev/license\n */\n\nimport {ALT, CONTROL, MAC_META, META, SHIFT} from '../../keycodes';\nimport {\n Injectable,\n InjectionToken,\n OnDestroy,\n NgZone,\n inject,\n RendererFactory2,\n DOCUMENT,\n} from '@angular/core';\nimport {Platform, _getEventTarget} from '../../platform';\n\nimport {BehaviorSubject, Observable} from 'rxjs';\nimport {distinctUntilChanged, skip} from 'rxjs/operators';\nimport {\n isFakeMousedownFromScreenReader,\n isFakeTouchstartFromScreenReader,\n} from '../fake-event-detection';\n\n/**\n * The input modalities detected by this service. Null is used if the input modality is unknown.\n */\nexport type InputModality = 'keyboard' | 'mouse' | 'touch' | null;\n\n/** Options to configure the behavior of the InputModalityDetector. */\nexport interface InputModalityDetectorOptions {\n /** Keys to ignore when detecting keyboard input modality. */\n ignoreKeys?: number[];\n}\n\n/**\n * Injectable options for the InputModalityDetector. These are shallowly merged with the default\n * options.\n */\nexport const INPUT_MODALITY_DETECTOR_OPTIONS = new InjectionToken(\n 'cdk-input-modality-detector-options',\n);\n\n/**\n * Default options for the InputModalityDetector.\n *\n * Modifier keys are ignored by default (i.e. when pressed won't cause the service to detect\n * keyboard input modality) for two reasons:\n *\n * 1. Modifier keys are commonly used with mouse to perform actions such as 'right click' or 'open\n * in new tab', and are thus less representative of actual keyboard interaction.\n * 2. VoiceOver triggers some keyboard events when linearly navigating with Control + Option (but\n * confusingly not with Caps Lock). Thus, to have parity with other screen readers, we ignore\n * these keys so as to not update the input modality.\n *\n * Note that we do not by default ignore the right Meta key on Safari because it has the same key\n * code as the ContextMenu key on other browsers. When we switch to using event.key, we can\n * distinguish between the two.\n */\nexport const INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS: InputModalityDetectorOptions = {\n ignoreKeys: [ALT, CONTROL, MAC_META, META, SHIFT],\n};\n\n/**\n * The amount of time needed to pass after a touchstart event in order for a subsequent mousedown\n * event to be attributed as mouse and not touch.\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.\n */\nexport const TOUCH_BUFFER_MS = 650;\n\n/**\n * Event listener options that enable capturing and also mark the listener as passive if the browser\n * supports it.\n */\nconst modalityEventListenerOptions = {\n passive: true,\n capture: true,\n};\n\n/**\n * Service that detects the user's input modality.\n *\n * This service does not update the input modality when a user navigates with a screen reader\n * (e.g. linear navigation with VoiceOver, object navigation / browse mode with NVDA, virtual PC\n * cursor mode with JAWS). This is in part due to technical limitations (i.e. keyboard events do not\n * fire as expected in these modes) but is also arguably the correct behavior. Navigating with a\n * screen reader is akin to visually scanning a page, and should not be interpreted as actual user\n * input interaction.\n *\n * When a user is not navigating but *interacting* with a screen reader, this service attempts to\n * update the input modality to keyboard, but in general this service's behavior is largely\n * undefined.\n */\n@Injectable({providedIn: 'root'})\nexport class InputModalityDetector implements OnDestroy {\n private readonly _platform = inject(Platform);\n private readonly _listenerCleanups: (() => void)[] | undefined;\n\n /** Emits whenever an input modality is detected. */\n readonly modalityDetected: Observable;\n\n /** Emits when the input modality changes. */\n readonly modalityChanged: Observable;\n\n /** The most recently detected input modality. */\n get mostRecentModality(): InputModality {\n return this._modality.value;\n }\n\n /**\n * The most recently detected input modality event target. Is null if no input modality has been\n * detected or if the associated event target is null for some unknown reason.\n */\n _mostRecentTarget: HTMLElement | null = null;\n\n /** The underlying BehaviorSubject that emits whenever an input modality is detected. */\n private readonly _modality = new BehaviorSubject(null);\n\n /** Options for this InputModalityDetector. */\n private readonly _options: InputModalityDetectorOptions;\n\n /**\n * The timestamp of the last touch input modality. Used to determine whether mousedown events\n * should be attributed to mouse or touch.\n */\n private _lastTouchMs = 0;\n\n /**\n * Handles keydown events. Must be an arrow function in order to preserve the context when it gets\n * bound.\n */\n private _onKeydown = (event: KeyboardEvent) => {\n // If this is one of the keys we should ignore, then ignore it and don't update the input\n // modality to keyboard.\n if (this._options?.ignoreKeys?.some(keyCode => keyCode === event.keyCode)) {\n return;\n }\n\n this._modality.next('keyboard');\n this._mostRecentTarget = _getEventTarget(event);\n };\n\n /**\n * Handles mousedown events. Must be an arrow function in order to preserve the context when it\n * gets bound.\n */\n private _onMousedown = (event: MouseEvent) => {\n // Touches trigger both touch and mouse events, so we need to distinguish between mouse events\n // that were triggered via mouse vs touch. To do so, check if the mouse event occurs closely\n // after the previous touch event.\n if (Date.now() - this._lastTouchMs < TOUCH_BUFFER_MS) {\n return;\n }\n\n // Fake mousedown events are fired by some screen readers when controls are activated by the\n // screen reader. Attribute them to keyboard input modality.\n this._modality.next(isFakeMousedownFromScreenReader(event) ? 'keyboard' : 'mouse');\n this._mostRecentTarget = _getEventTarget(event);\n };\n\n /**\n * Handles touchstart events. Must be an arrow function in order to preserve the context when it\n * gets bound.\n */\n private _onTouchstart = (event: TouchEvent) => {\n // Same scenario as mentioned in _onMousedown, but on touch screen devices, fake touchstart\n // events are fired. Again, attribute to keyboard input modality.\n if (isFakeTouchstartFromScreenReader(event)) {\n this._modality.next('keyboard');\n return;\n }\n\n // Store the timestamp of this touch event, as it's used to distinguish between mouse events\n // triggered via mouse vs touch.\n this._lastTouchMs = Date.now();\n\n this._modality.next('touch');\n this._mostRecentTarget = _getEventTarget(event);\n };\n\n constructor(...args: unknown[]);\n\n constructor() {\n const ngZone = inject(NgZone);\n const document = inject(DOCUMENT);\n const options = inject(INPUT_MODALITY_DETECTOR_OPTIONS, {optional: true});\n\n this._options = {\n ...INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS,\n ...options,\n };\n\n // Skip the first emission as it's null.\n this.modalityDetected = this._modality.pipe(skip(1));\n this.modalityChanged = this.modalityDetected.pipe(distinctUntilChanged());\n\n // If we're not in a browser, this service should do nothing, as there's no relevant input\n // modality to detect.\n if (this._platform.isBrowser) {\n const renderer = inject(RendererFactory2).createRenderer(null, null);\n\n this._listenerCleanups = ngZone.runOutsideAngular(() => {\n return [\n renderer.listen(document, 'keydown', this._onKeydown, modalityEventListenerOptions),\n renderer.listen(document, 'mousedown', this._onMousedown, modalityEventListenerOptions),\n renderer.listen(document, 'touchstart', this._onTouchstart, modalityEventListenerOptions),\n ];\n });\n }\n }\n\n ngOnDestroy() {\n this._modality.complete();\n this._listenerCleanups?.forEach(cleanup => cleanup());\n }\n}\n","/**\n * @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.dev/license\n */\n\nimport {\n Platform,\n normalizePassiveListenerOptions,\n _getShadowRoot,\n _getEventTarget,\n} from '../../platform';\nimport {\n Directive,\n ElementRef,\n EventEmitter,\n Injectable,\n InjectionToken,\n NgZone,\n OnDestroy,\n Output,\n AfterViewInit,\n inject,\n DOCUMENT,\n} from '@angular/core';\nimport {Observable, of as observableOf, Subject, Subscription} from 'rxjs';\nimport {takeUntil} from 'rxjs/operators';\nimport {coerceElement} from '../../coercion';\n\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 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(\n 'cdk-focus-monitor-default-options',\n);\n\ntype MonitoredElementInfo = {\n checkChildren: boolean;\n readonly subject: Subject;\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 private _ngZone = inject(NgZone);\n private _platform = inject(Platform);\n private readonly _inputModalityDetector = inject(InputModalityDetector);\n\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: ReturnType;\n\n /** The timeout id of the origin clearing timeout. */\n private _originTimeoutId: ReturnType;\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();\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();\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 = setTimeout(() => (this._windowFocused = false));\n };\n\n /** Used to reference correct document/window */\n protected _document? = inject(DOCUMENT, {optional: true});\n\n /** Subject for stopping our InputModalityDetector subscription. */\n private readonly _stopInputModalityDetector = new Subject();\n\n constructor(...args: unknown[]);\n\n constructor() {\n const options = inject(FOCUS_MONITOR_DEFAULT_OPTIONS, {\n optional: true,\n });\n\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(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;\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, checkChildren?: boolean): Observable;\n\n monitor(\n element: HTMLElement | ElementRef,\n checkChildren: boolean = false,\n ): Observable {\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 // Note: we don't want the observable to emit at all so we don't pass any parameters.\n return observableOf();\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(),\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): void;\n\n stopMonitoring(element: HTMLElement | ElementRef): 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, origin: FocusOrigin, options?: FocusOptions): void;\n\n focusVia(\n element: HTMLElement | ElementRef,\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 //
\n //
\n //
\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(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 _elementRef = inject>(ElementRef);\n private _focusMonitor = inject(FocusMonitor);\n\n private _monitorSubscription: Subscription;\n private _focusOrigin: FocusOrigin = null;\n\n @Output() readonly cdkFocusChange = new EventEmitter();\n\n constructor(...args: unknown[]);\n constructor() {}\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 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