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{"version":3,"file":"a11y.mjs","sources":["../../../../../../src/cdk/a11y/aria-describer/aria-reference.ts","../../../../../../src/cdk/a11y/aria-describer/aria-describer.ts","../../../../../../src/cdk/a11y/key-manager/list-key-manager.ts","../../../../../../src/cdk/a11y/key-manager/activedescendant-key-manager.ts","../../../../../../src/cdk/a11y/key-manager/focus-key-manager.ts","../../../../../../src/cdk/a11y/interactivity-checker/interactivity-checker.ts","../../../../../../src/cdk/a11y/focus-trap/focus-trap.ts","../../../../../../src/cdk/a11y/focus-trap/configurable-focus-trap.ts","../../../../../../src/cdk/a11y/focus-trap/focus-trap-inert-strategy.ts","../../../../../../src/cdk/a11y/focus-trap/event-listener-inert-strategy.ts","../../../../../../src/cdk/a11y/focus-trap/focus-trap-manager.ts","../../../../../../src/cdk/a11y/focus-trap/configurable-focus-trap-factory.ts","../../../../../../src/cdk/a11y/fake-event-detection.ts","../../../../../../src/cdk/a11y/input-modality/input-modality-detector.ts","../../../../../../src/cdk/a11y/live-announcer/live-announcer-tokens.ts","../../../../../../src/cdk/a11y/live-announcer/live-announcer.ts","../../../../../../src/cdk/a11y/focus-monitor/focus-monitor.ts","../../../../../../src/cdk/a11y/high-contrast-mode/high-contrast-mode-detector.ts","../../../../../../src/cdk/a11y/a11y-module.ts","../../../../../../src/cdk/a11y/a11y_public_index.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.io/license\n */\n\n/** IDs are delimited by an empty space, as per the spec. */\nconst ID_DELIMITER = ' ';\n\n/**\n * Adds the given ID to the specified ARIA attribute on an element.\n * Used for attributes such as aria-labelledby, aria-owns, etc.\n */\nexport function addAriaReferencedId(el: Element, attr: `aria-${string}`, id: string) {\n const ids = getAriaReferenceIds(el, attr);\n if (ids.some(existingId => existingId.trim() == id.trim())) {\n return;\n }\n ids.push(id.trim());\n\n el.setAttribute(attr, ids.join(ID_DELIMITER));\n}\n\n/**\n * Removes the given ID from the specified ARIA attribute on an element.\n * Used for attributes such as aria-labelledby, aria-owns, etc.\n */\nexport function removeAriaReferencedId(el: Element, attr: `aria-${string}`, id: string) {\n const ids = getAriaReferenceIds(el, attr);\n const filteredIds = ids.filter(val => val != id.trim());\n\n if (filteredIds.length) {\n el.setAttribute(attr, filteredIds.join(ID_DELIMITER));\n } else {\n el.removeAttribute(attr);\n }\n}\n\n/**\n * Gets the list of IDs referenced by the given ARIA attribute on an element.\n * Used for attributes such as aria-labelledby, aria-owns, etc.\n */\nexport function getAriaReferenceIds(el: Element, attr: string): string[] {\n // Get string array of all individual ids (whitespace delimited) in the attribute value\n return (el.getAttribute(attr) || '').match(/\\S+/g) || [];\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.io/license\n */\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable, OnDestroy, APP_ID, inject} from '@angular/core';\nimport {Platform} from '@angular/cdk/platform';\nimport {addAriaReferencedId, getAriaReferenceIds, removeAriaReferencedId} from './aria-reference';\n\n/**\n * Interface used to register message elements and keep a count of how many registrations have\n * the same message and the reference to the message element used for the `aria-describedby`.\n */\nexport interface RegisteredMessage {\n /** The element containing the message. */\n messageElement: Element;\n\n /** The number of elements that reference this message element via `aria-describedby`. */\n referenceCount: number;\n}\n\n/**\n * ID used for the body container where all messages are appended.\n * @deprecated No longer being used. To be removed.\n * @breaking-change 14.0.0\n */\nexport const MESSAGES_CONTAINER_ID = 'cdk-describedby-message-container';\n\n/**\n * ID prefix used for each created message element.\n * @deprecated To be turned into a private variable.\n * @breaking-change 14.0.0\n */\nexport const CDK_DESCRIBEDBY_ID_PREFIX = 'cdk-describedby-message';\n\n/**\n * Attribute given to each host element that is described by a message element.\n * @deprecated To be turned into a private variable.\n * @breaking-change 14.0.0\n */\nexport const CDK_DESCRIBEDBY_HOST_ATTRIBUTE = 'cdk-describedby-host';\n\n/** Global incremental identifier for each registered message element. */\nlet nextId = 0;\n\n/**\n * Utility that creates visually hidden elements with a message content. Useful for elements that\n * want to use aria-describedby to further describe themselves without adding additional visual\n * content.\n */\n@Injectable({providedIn: 'root'})\nexport class AriaDescriber implements OnDestroy {\n private _document: Document;\n\n /** Map of all registered message elements that have been placed into the document. */\n private _messageRegistry = new Map<string | Element, RegisteredMessage>();\n\n /** Container for all registered messages. */\n private _messagesContainer: HTMLElement | null = null;\n\n /** Unique ID for the service. */\n private readonly _id = `${nextId++}`;\n\n constructor(\n @Inject(DOCUMENT) _document: any,\n /**\n * @deprecated To be turned into a required parameter.\n * @breaking-change 14.0.0\n */\n private _platform?: Platform,\n ) {\n this._document = _document;\n this._id = inject(APP_ID) + '-' + nextId++;\n }\n\n /**\n * Adds to the host element an aria-describedby reference to a hidden element that contains\n * the message. If the same message has already been registered, then it will reuse the created\n * message element.\n */\n describe(hostElement: Element, message: string, role?: string): void;\n\n /**\n * Adds to the host element an aria-describedby reference to an already-existing message element.\n */\n describe(hostElement: Element, message: HTMLElement): void;\n\n describe(hostElement: Element, message: string | HTMLElement, role?: string): void {\n if (!this._canBeDescribed(hostElement, message)) {\n return;\n }\n\n const key = getKey(message, role);\n\n if (typeof message !== 'string') {\n // We need to ensure that the element has an ID.\n setMessageId(message, this._id);\n this._messageRegistry.set(key, {messageElement: message, referenceCount: 0});\n } else if (!this._messageRegistry.has(key)) {\n this._createMessageElement(message, role);\n }\n\n if (!this._isElementDescribedByMessage(hostElement, key)) {\n this._addMessageReference(hostElement, key);\n }\n }\n\n /** Removes the host element's aria-describedby reference to the message. */\n removeDescription(hostElement: Element, message: string, role?: string): void;\n\n /** Removes the host element's aria-describedby reference to the message element. */\n removeDescription(hostElement: Element, message: HTMLElement): void;\n\n removeDescription(hostElement: Element, message: string | HTMLElement, role?: string): void {\n if (!message || !this._isElementNode(hostElement)) {\n return;\n }\n\n const key = getKey(message, role);\n\n if (this._isElementDescribedByMessage(hostElement, key)) {\n this._removeMessageReference(hostElement, key);\n }\n\n // If the message is a string, it means that it's one that we created for the\n // consumer so we can remove it safely, otherwise we should leave it in place.\n if (typeof message === 'string') {\n const registeredMessage = this._messageRegistry.get(key);\n if (registeredMessage && registeredMessage.referenceCount === 0) {\n this._deleteMessageElement(key);\n }\n }\n\n if (this._messagesContainer?.childNodes.length === 0) {\n this._messagesContainer.remove();\n this._messagesContainer = null;\n }\n }\n\n /** Unregisters all created message elements and removes the message container. */\n ngOnDestroy() {\n const describedElements = this._document.querySelectorAll(\n `[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}=\"${this._id}\"]`,\n );\n\n for (let i = 0; i < describedElements.length; i++) {\n this._removeCdkDescribedByReferenceIds(describedElements[i]);\n describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n }\n\n this._messagesContainer?.remove();\n this._messagesContainer = null;\n this._messageRegistry.clear();\n }\n\n /**\n * Creates a new element in the visually hidden message container element with the message\n * as its content and adds it to the message registry.\n */\n private _createMessageElement(message: string, role?: string) {\n const messageElement = this._document.createElement('div');\n setMessageId(messageElement, this._id);\n messageElement.textContent = message;\n\n if (role) {\n messageElement.setAttribute('role', role);\n }\n\n this._createMessagesContainer();\n this._messagesContainer!.appendChild(messageElement);\n this._messageRegistry.set(getKey(message, role), {messageElement, referenceCount: 0});\n }\n\n /** Deletes the message element from the global messages container. */\n private _deleteMessageElement(key: string | Element) {\n this._messageRegistry.get(key)?.messageElement?.remove();\n this._messageRegistry.delete(key);\n }\n\n /** Creates the global container for all aria-describedby messages. */\n private _createMessagesContainer() {\n if (this._messagesContainer) {\n return;\n }\n\n const containerClassName = 'cdk-describedby-message-container';\n const serverContainers = this._document.querySelectorAll(\n `.${containerClassName}[platform=\"server\"]`,\n );\n\n for (let i = 0; i < serverContainers.length; i++) {\n // When going from the server to the client, we may end up in a situation where there's\n // already a container on the page, but we don't have a reference to it. Clear the\n // old container so we don't get duplicates. Doing this, instead of emptying the previous\n // container, should be slightly faster.\n serverContainers[i].remove();\n }\n\n const messagesContainer = this._document.createElement('div');\n\n // We add `visibility: hidden` in order to prevent text in this container from\n // being searchable by the browser's Ctrl + F functionality.\n // Screen-readers will still read the description for elements with aria-describedby even\n // when the description element is not visible.\n messagesContainer.style.visibility = 'hidden';\n // Even though we use `visibility: hidden`, we still apply `cdk-visually-hidden` so that\n // the description element doesn't impact page layout.\n messagesContainer.classList.add(containerClassName);\n messagesContainer.classList.add('cdk-visually-hidden');\n\n // @breaking-change 14.0.0 Remove null check for `_platform`.\n if (this._platform && !this._platform.isBrowser) {\n messagesContainer.setAttribute('platform', 'server');\n }\n\n this._document.body.appendChild(messagesContainer);\n this._messagesContainer = messagesContainer;\n }\n\n /** Removes all cdk-describedby messages that are hosted through the element. */\n private _removeCdkDescribedByReferenceIds(element: Element) {\n // Remove all aria-describedby reference IDs that are prefixed by CDK_DESCRIBEDBY_ID_PREFIX\n const originalReferenceIds = getAriaReferenceIds(element, 'aria-describedby').filter(\n id => id.indexOf(CDK_DESCRIBEDBY_ID_PREFIX) != 0,\n );\n element.setAttribute('aria-describedby', originalReferenceIds.join(' '));\n }\n\n /**\n * Adds a message reference to the element using aria-describedby and increments the registered\n * message's reference count.\n */\n private _addMessageReference(element: Element, key: string | Element) {\n const registeredMessage = this._messageRegistry.get(key)!;\n\n // Add the aria-describedby reference and set the\n // describedby_host attribute to mark the element.\n addAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id);\n element.setAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE, this._id);\n registeredMessage.referenceCount++;\n }\n\n /**\n * Removes a message reference from the element using aria-describedby\n * and decrements the registered message's reference count.\n */\n private _removeMessageReference(element: Element, key: string | Element) {\n const registeredMessage = this._messageRegistry.get(key)!;\n registeredMessage.referenceCount--;\n\n removeAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id);\n element.removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n }\n\n /** Returns true if the element has been described by the provided message ID. */\n private _isElementDescribedByMessage(element: Element, key: string | Element): boolean {\n const referenceIds = getAriaReferenceIds(element, 'aria-describedby');\n const registeredMessage = this._messageRegistry.get(key);\n const messageId = registeredMessage && registeredMessage.messageElement.id;\n\n return !!messageId && referenceIds.indexOf(messageId) != -1;\n }\n\n /** Determines whether a message can be described on a particular element. */\n private _canBeDescribed(element: Element, message: string | HTMLElement | void): boolean {\n if (!this._isElementNode(element)) {\n return false;\n }\n\n if (message && typeof message === 'object') {\n // We'd have to make some assumptions about the description element's text, if the consumer\n // passed in an element. Assume that if an element is passed in, the consumer has verified\n // that it can be used as a description.\n return true;\n }\n\n const trimmedMessage = message == null ? '' : `${message}`.trim();\n const ariaLabel = element.getAttribute('aria-label');\n\n // We shouldn't set descriptions if they're exactly the same as the `aria-label` of the\n // element, because screen readers will end up reading out the same text twice in a row.\n return trimmedMessage ? !ariaLabel || ariaLabel.trim() !== trimmedMessage : false;\n }\n\n /** Checks whether a node is an Element node. */\n private _isElementNode(element: Node): element is Element {\n return element.nodeType === this._document.ELEMENT_NODE;\n }\n}\n\n/** Gets a key that can be used to look messages up in the registry. */\nfunction getKey(message: string | Element, role?: string): string | Element {\n return typeof message === 'string' ? `${role || ''}/${message}` : message;\n}\n\n/** Assigns a unique ID to an element, if it doesn't have one already. */\nfunction setMessageId(element: HTMLElement, serviceId: string) {\n if (!element.id) {\n element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${serviceId}-${nextId++}`;\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.io/license\n */\n\nimport {QueryList} from '@angular/core';\nimport {Subject, Subscription} from 'rxjs';\nimport {\n UP_ARROW,\n DOWN_ARROW,\n LEFT_ARROW,\n RIGHT_ARROW,\n TAB,\n A,\n Z,\n ZERO,\n NINE,\n hasModifierKey,\n HOME,\n END,\n PAGE_UP,\n PAGE_DOWN,\n} from '@angular/cdk/keycodes';\nimport {debounceTime, filter, map, tap} from 'rxjs/operators';\n\n/** This interface is for items that can be passed to a ListKeyManager. */\nexport interface ListKeyManagerOption {\n /** Whether the option is disabled. */\n disabled?: boolean;\n\n /** Gets the label for this option. */\n getLabel?(): string;\n}\n\n/** Modifier keys handled by the ListKeyManager. */\nexport type ListKeyManagerModifierKey = 'altKey' | 'ctrlKey' | 'metaKey' | 'shiftKey';\n\n/**\n * This class manages keyboard events for selectable lists. If you pass it a query list\n * of items, it will set the active item correctly when arrow events occur.\n */\nexport class ListKeyManager<T extends ListKeyManagerOption> {\n private _activeItemIndex = -1;\n private _activeItem: T | null = null;\n private _wrap = false;\n private readonly _letterKeyStream = new Subject<string>();\n private _typeaheadSubscription = Subscription.EMPTY;\n private _itemChangesSubscription?: Subscription;\n private _vertical = true;\n private _horizontal: 'ltr' | 'rtl' | null;\n private _allowedModifierKeys: ListKeyManagerModifierKey[] = [];\n private _homeAndEnd = false;\n private _pageUpAndDown = {enabled: false, delta: 10};\n\n /**\n * Predicate function that can be used to check whether an item should be skipped\n * by the key manager. By default, disabled items are skipped.\n */\n private _skipPredicateFn = (item: T) => item.disabled;\n\n // Buffer for the letters that the user has pressed when the typeahead option is turned on.\n private _pressedLetters: string[] = [];\n\n constructor(private _items: QueryList<T> | T[]) {\n // We allow for the items to be an array because, in some cases, the consumer may\n // not have access to a QueryList of the items they want to manage (e.g. when the\n // items aren't being collected via `ViewChildren` or `ContentChildren`).\n if (_items instanceof QueryList) {\n this._itemChangesSubscription = _items.changes.subscribe((newItems: QueryList<T>) => {\n if (this._activeItem) {\n const itemArray = newItems.toArray();\n const newIndex = itemArray.indexOf(this._activeItem);\n\n if (newIndex > -1 && newIndex !== this._activeItemIndex) {\n this._activeItemIndex = newIndex;\n }\n }\n });\n }\n }\n\n /**\n * Stream that emits any time the TAB key is pressed, so components can react\n * when focus is shifted off of the list.\n */\n readonly tabOut = new Subject<void>();\n\n /** Stream that emits whenever the active item of the list manager changes. */\n readonly change = new Subject<number>();\n\n /**\n * Sets the predicate function that determines which items should be skipped by the\n * list key manager.\n * @param predicate Function that determines whether the given item should be skipped.\n */\n skipPredicate(predicate: (item: T) => boolean): this {\n this._skipPredicateFn = predicate;\n return this;\n }\n\n /**\n * Configures wrapping mode, which determines whether the active item will wrap to\n * the other end of list when there are no more items in the given direction.\n * @param shouldWrap Whether the list should wrap when reaching the end.\n */\n withWrap(shouldWrap = true): this {\n this._wrap = shouldWrap;\n return this;\n }\n\n /**\n * Configures whether the key manager should be able to move the selection vertically.\n * @param enabled Whether vertical selection should be enabled.\n */\n withVerticalOrientation(enabled: boolean = true): this {\n this._vertical = enabled;\n return this;\n }\n\n /**\n * Configures the key manager to move the selection horizontally.\n * Passing in `null` will disable horizontal movement.\n * @param direction Direction in which the selection can be moved.\n */\n withHorizontalOrientation(direction: 'ltr' | 'rtl' | null): this {\n this._horizontal = direction;\n return this;\n }\n\n /**\n * Modifier keys which are allowed to be held down and whose default actions will be prevented\n * as the user is pressing the arrow keys. Defaults to not allowing any modifier keys.\n */\n withAllowedModifierKeys(keys: ListKeyManagerModifierKey[]): this {\n this._allowedModifierKeys = keys;\n return this;\n }\n\n /**\n * Turns on typeahead mode which allows users to set the active item by typing.\n * @param debounceInterval Time to wait after the last keystroke before setting the active item.\n */\n withTypeAhead(debounceInterval: number = 200): this {\n if (\n (typeof ngDevMode === 'undefined' || ngDevMode) &&\n this._items.length &&\n this._items.some(item => typeof item.getLabel !== 'function')\n ) {\n throw Error('ListKeyManager items in typeahead mode must implement the `getLabel` method.');\n }\n\n this._typeaheadSubscription.unsubscribe();\n\n // Debounce the presses of non-navigational keys, collect the ones that correspond to letters\n // and convert those letters back into a string. Afterwards find the first item that starts\n // with that string and select it.\n this._typeaheadSubscription = this._letterKeyStream\n .pipe(\n tap(letter => this._pressedLetters.push(letter)),\n debounceTime(debounceInterval),\n filter(() => this._pressedLetters.length > 0),\n map(() => this._pressedLetters.join('')),\n )\n .subscribe(inputString => {\n const items = this._getItemsArray();\n\n // Start at 1 because we want to start searching at the item immediately\n // following the current active item.\n for (let i = 1; i < items.length + 1; i++) {\n const index = (this._activeItemIndex + i) % items.length;\n const item = items[index];\n\n if (\n !this._skipPredicateFn(item) &&\n item.getLabel!().toUpperCase().trim().indexOf(inputString) === 0\n ) {\n this.setActiveItem(index);\n break;\n }\n }\n\n this._pressedLetters = [];\n });\n\n return this;\n }\n\n /** Cancels the current typeahead sequence. */\n cancelTypeahead(): this {\n this._pressedLetters = [];\n return this;\n }\n\n /**\n * Configures the key manager to activate the first and last items\n * respectively when the Home or End key is pressed.\n * @param enabled Whether pressing the Home or End key activates the first/last item.\n */\n withHomeAndEnd(enabled: boolean = true): this {\n this._homeAndEnd = enabled;\n return this;\n }\n\n /**\n * Configures the key manager to activate every 10th, configured or first/last element in up/down direction\n * respectively when the Page-Up or Page-Down key is pressed.\n * @param enabled Whether pressing the Page-Up or Page-Down key activates the first/last item.\n * @param delta Whether pressing the Home or End key activates the first/last item.\n */\n withPageUpDown(enabled: boolean = true, delta: number = 10): this {\n this._pageUpAndDown = {enabled, delta};\n return this;\n }\n\n /**\n * Sets the active item to the item at the index specified.\n * @param index The index of the item to be set as active.\n */\n setActiveItem(index: number): void;\n\n /**\n * Sets the active item to the specified item.\n * @param item The item to be set as active.\n */\n setActiveItem(item: T): void;\n\n setActiveItem(item: any): void {\n const previousActiveItem = this._activeItem;\n\n this.updateActiveItem(item);\n\n if (this._activeItem !== previousActiveItem) {\n this.change.next(this._activeItemIndex);\n }\n }\n\n /**\n * Sets the active item depending on the key event passed in.\n * @param event Keyboard event to be used for determining which element should be active.\n */\n onKeydown(event: KeyboardEvent): void {\n const keyCode = event.keyCode;\n const modifiers: ListKeyManagerModifierKey[] = ['altKey', 'ctrlKey', 'metaKey', 'shiftKey'];\n const isModifierAllowed = modifiers.every(modifier => {\n return !event[modifier] || this._allowedModifierKeys.indexOf(modifier) > -1;\n });\n\n switch (keyCode) {\n case TAB:\n this.tabOut.next();\n return;\n\n case DOWN_ARROW:\n if (this._vertical && isModifierAllowed) {\n this.setNextItemActive();\n break;\n } else {\n return;\n }\n\n case UP_ARROW:\n if (this._vertical && isModifierAllowed) {\n this.setPreviousItemActive();\n break;\n } else {\n return;\n }\n\n case RIGHT_ARROW:\n if (this._horizontal && isModifierAllowed) {\n this._horizontal === 'rtl' ? this.setPreviousItemActive() : this.setNextItemActive();\n break;\n } else {\n return;\n }\n\n case LEFT_ARROW:\n if (this._horizontal && isModifierAllowed) {\n this._horizontal === 'rtl' ? this.setNextItemActive() : this.setPreviousItemActive();\n break;\n } else {\n return;\n }\n\n case HOME:\n if (this._homeAndEnd && isModifierAllowed) {\n this.setFirstItemActive();\n break;\n } else {\n return;\n }\n\n case END:\n if (this._homeAndEnd && isModifierAllowed) {\n this.setLastItemActive();\n break;\n } else {\n return;\n }\n\n case PAGE_UP:\n if (this._pageUpAndDown.enabled && isModifierAllowed) {\n const targetIndex = this._activeItemIndex - this._pageUpAndDown.delta;\n this._setActiveItemByIndex(targetIndex > 0 ? targetIndex : 0, 1);\n break;\n } else {\n return;\n }\n\n case PAGE_DOWN:\n if (this._pageUpAndDown.enabled && isModifierAllowed) {\n const targetIndex = this._activeItemIndex + this._pageUpAndDown.delta;\n const itemsLength = this._getItemsArray().length;\n this._setActiveItemByIndex(targetIndex < itemsLength ? targetIndex : itemsLength - 1, -1);\n break;\n } else {\n return;\n }\n\n default:\n if (isModifierAllowed || hasModifierKey(event, 'shiftKey')) {\n // Attempt to use the `event.key` which also maps it to the user's keyboard language,\n // otherwise fall back to resolving alphanumeric characters via the keyCode.\n if (event.key && event.key.length === 1) {\n this._letterKeyStream.next(event.key.toLocaleUpperCase());\n } else if ((keyCode >= A && keyCode <= Z) || (keyCode >= ZERO && keyCode <= NINE)) {\n this._letterKeyStream.next(String.fromCharCode(keyCode));\n }\n }\n\n // Note that we return here, in order to avoid preventing\n // the default action of non-navigational keys.\n return;\n }\n\n this._pressedLetters = [];\n event.preventDefault();\n }\n\n /** Index of the currently active item. */\n get activeItemIndex(): number | null {\n return this._activeItemIndex;\n }\n\n /** The active item. */\n get activeItem(): T | null {\n return this._activeItem;\n }\n\n /** Gets whether the user is currently typing into the manager using the typeahead feature. */\n isTyping(): boolean {\n return this._pressedLetters.length > 0;\n }\n\n /** Sets the active item to the first enabled item in the list. */\n setFirstItemActive(): void {\n this._setActiveItemByIndex(0, 1);\n }\n\n /** Sets the active item to the last enabled item in the list. */\n setLastItemActive(): void {\n this._setActiveItemByIndex(this._items.length - 1, -1);\n }\n\n /** Sets the active item to the next enabled item in the list. */\n setNextItemActive(): void {\n this._activeItemIndex < 0 ? this.setFirstItemActive() : this._setActiveItemByDelta(1);\n }\n\n /** Sets the active item to a previous enabled item in the list. */\n setPreviousItemActive(): void {\n this._activeItemIndex < 0 && this._wrap\n ? this.setLastItemActive()\n : this._setActiveItemByDelta(-1);\n }\n\n /**\n * Allows setting the active without any other effects.\n * @param index Index of the item to be set as active.\n */\n updateActiveItem(index: number): void;\n\n /**\n * Allows setting the active item without any other effects.\n * @param item Item to be set as active.\n */\n updateActiveItem(item: T): void;\n\n updateActiveItem(item: any): void {\n const itemArray = this._getItemsArray();\n const index = typeof item === 'number' ? item : itemArray.indexOf(item);\n const activeItem = itemArray[index];\n\n // Explicitly check for `null` and `undefined` because other falsy values are valid.\n this._activeItem = activeItem == null ? null : activeItem;\n this._activeItemIndex = index;\n }\n\n /** Cleans up the key manager. */\n destroy() {\n this._typeaheadSubscription.unsubscribe();\n this._itemChangesSubscription?.unsubscribe();\n this._letterKeyStream.complete();\n this.tabOut.complete();\n this.change.complete();\n this._pressedLetters = [];\n }\n\n /**\n * This method sets the active item, given a list of items and the delta between the\n * currently active item and the new active item. It will calculate differently\n * depending on whether wrap mode is turned on.\n */\n private _setActiveItemByDelta(delta: -1 | 1): void {\n this._wrap ? this._setActiveInWrapMode(delta) : this._setActiveInDefaultMode(delta);\n }\n\n /**\n * Sets the active item properly given \"wrap\" mode. In other words, it will continue to move\n * down the list until it finds an item that is not disabled, and it will wrap if it\n * encounters either end of the list.\n */\n private _setActiveInWrapMode(delta: -1 | 1): void {\n const items = this._getItemsArray();\n\n for (let i = 1; i <= items.length; i++) {\n const index = (this._activeItemIndex + delta * i + items.length) % items.length;\n const item = items[index];\n\n if (!this._skipPredicateFn(item)) {\n this.setActiveItem(index);\n return;\n }\n }\n }\n\n /**\n * Sets the active item properly given the default mode. In other words, it will\n * continue to move down the list until it finds an item that is not disabled. If\n * it encounters either end of the list, it will stop and not wrap.\n */\n private _setActiveInDefaultMode(delta: -1 | 1): void {\n this._setActiveItemByIndex(this._activeItemIndex + delta, delta);\n }\n\n /**\n * Sets the active item to the first enabled item starting at the index specified. If the\n * item is disabled, it will move in the fallbackDelta direction until it either\n * finds an enabled item or encounters the end of the list.\n */\n private _setActiveItemByIndex(index: number, fallbackDelta: -1 | 1): void {\n const items = this._getItemsArray();\n\n if (!items[index]) {\n return;\n }\n\n while (this._skipPredicateFn(items[index])) {\n index += fallbackDelta;\n\n if (!items[index]) {\n return;\n }\n }\n\n this.setActiveItem(index);\n }\n\n /** Returns the items as an array. */\n private _getItemsArray(): T[] {\n return this._items instanceof QueryList ? this._items.toArray() : this._items;\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.io/license\n */\n\nimport {ListKeyManager, ListKeyManagerOption} from './list-key-manager';\n\n/**\n * This is the interface for highlightable items (used by the ActiveDescendantKeyManager).\n * Each item must know how to style itself as active or inactive and whether or not it is\n * currently disabled.\n */\nexport interface Highlightable extends ListKeyManagerOption {\n /** Applies the styles for an active item to this item. */\n setActiveStyles(): void;\n\n /** Applies the styles for an inactive item to this item. */\n setInactiveStyles(): void;\n}\n\nexport class ActiveDescendantKeyManager<T> extends ListKeyManager<Highlightable & T> {\n /**\n * Sets the active item to the item at the specified index and adds the\n * active styles to the newly active item. Also removes active styles\n * from the previously active item.\n * @param index Index of the item to be set as active.\n */\n override setActiveItem(index: number): void;\n\n /**\n * Sets the active item to the item to the specified one and adds the\n * active styles to the it. Also removes active styles from the\n * previously active item.\n * @param item Item to be set as active.\n */\n override setActiveItem(item: T): void;\n\n override setActiveItem(index: any): void {\n if (this.activeItem) {\n this.activeItem.setInactiveStyles();\n }\n super.setActiveItem(index);\n if (this.activeItem) {\n this.activeItem.setActiveStyles();\n }\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.io/license\n */\n\nimport {ListKeyManager, ListKeyManagerOption} from './list-key-manager';\nimport {FocusOrigin} from '../focus-monitor/focus-monitor';\n\n/**\n * This is the interface for focusable items (used by the FocusKeyManager).\n * Each item must know how to focus itself, whether or not it is currently disabled\n * and be able to supply its label.\n */\nexport interface FocusableOption extends ListKeyManagerOption {\n /** Focuses the `FocusableOption`. */\n focus(origin?: FocusOrigin): void;\n}\n\nexport class FocusKeyManager<T> extends ListKeyManager<FocusableOption & T> {\n private _origin: FocusOrigin = 'program';\n\n /**\n * Sets the focus origin that will be passed in to the items for any subsequent `focus` calls.\n * @param origin Focus origin to be used when focusing items.\n */\n setFocusOrigin(origin: FocusOrigin): this {\n this._origin = origin;\n return this;\n }\n\n /**\n * Sets the active item to the item at the specified\n * index and focuses the newly active item.\n * @param index Index of the item to be set as active.\n */\n override setActiveItem(index: number): void;\n\n /**\n * Sets the active item to the item that is specified and focuses it.\n * @param item Item to be set as active.\n */\n override setActiveItem(item: T): void;\n\n override setActiveItem(item: any): void {\n super.setActiveItem(item);\n\n if (this.activeItem) {\n this.activeItem.focus(this._origin);\n }\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.io/license\n */\n\nimport {Platform} from '@angular/cdk/platform';\nimport {Injectable} from '@angular/core';\n\n/**\n * Configuration for the isFocusable method.\n */\nexport class IsFocusableConfig {\n /**\n * Whether to count an element as focusable even if it is not currently visible.\n */\n ignoreVisibility: boolean = false;\n}\n\n// The InteractivityChecker leans heavily on the ally.js accessibility utilities.\n// Methods like `isTabbable` are only covering specific edge-cases for the browsers which are\n// supported.\n\n/**\n * Utility for checking the interactivity of an element, such as whether it is focusable or\n * tabbable.\n */\n@Injectable({providedIn: 'root'})\nexport class InteractivityChecker {\n constructor(private _platform: Platform) {}\n\n /**\n * Gets whether an element is disabled.\n *\n * @param element Element to be checked.\n * @returns Whether the element is disabled.\n */\n isDisabled(element: HTMLElement): boolean {\n // This does not capture some cases, such as a non-form control with a disabled attribute or\n // a form control inside of a disabled form, but should capture the most common cases.\n return element.hasAttribute('disabled');\n }\n\n /**\n * Gets whether an element is visible for the purposes of interactivity.\n *\n * This will capture states like `display: none` and `visibility: hidden`, but not things like\n * being clipped by an `overflow: hidden` parent or being outside the viewport.\n *\n * @returns Whether the element is visible.\n */\n isVisible(element: HTMLElement): boolean {\n return hasGeometry(element) && getComputedStyle(element).visibility === 'visible';\n }\n\n /**\n * Gets whether an element can be reached via Tab key.\n * Assumes that the element has already been checked with isFocusable.\n *\n * @param element Element to be checked.\n * @returns Whether the element is tabbable.\n */\n isTabbable(element: HTMLElement): boolean {\n // Nothing is tabbable on the server 😎\n if (!this._platform.isBrowser) {\n return false;\n }\n\n const frameElement = getFrameElement(getWindow(element));\n\n if (frameElement) {\n // Frame elements inherit their tabindex onto all child elements.\n if (getTabIndexValue(frameElement) === -1) {\n return false;\n }\n\n // Browsers disable tabbing to an element inside of an invisible frame.\n if (!this.isVisible(frameElement)) {\n return false;\n }\n }\n\n let nodeName = element.nodeName.toLowerCase();\n let tabIndexValue = getTabIndexValue(element);\n\n if (element.hasAttribute('contenteditable')) {\n return tabIndexValue !== -1;\n }\n\n if (nodeName === 'iframe' || nodeName === 'object') {\n // The frame or object's content may be tabbable depending on the content, but it's\n // not possibly to reliably detect the content of the frames. We always consider such\n // elements as non-tabbable.\n return false;\n }\n\n // In iOS, the browser only considers some specific elements as tabbable.\n if (this._platform.WEBKIT && this._platform.IOS && !isPotentiallyTabbableIOS(element)) {\n return false;\n }\n\n if (nodeName === 'audio') {\n // Audio elements without controls enabled are never tabbable, regardless\n // of the tabindex attribute explicitly being set.\n if (!element.hasAttribute('controls')) {\n return false;\n }\n // Audio elements with controls are by default tabbable unless the\n // tabindex attribute is set to `-1` explicitly.\n return tabIndexValue !== -1;\n }\n\n if (nodeName === 'video') {\n // For all video elements, if the tabindex attribute is set to `-1`, the video\n // is not tabbable. Note: We cannot rely on the default `HTMLElement.tabIndex`\n // property as that one is set to `-1` in Chrome, Edge and Safari v13.1. The\n // tabindex attribute is the source of truth here.\n if (tabIndexValue === -1) {\n return false;\n }\n // If the tabindex is explicitly set, and not `-1` (as per check before), the\n // video element is always tabbable (regardless of whether it has controls or not).\n if (tabIndexValue !== null) {\n return true;\n }\n // Otherwise (when no explicit tabindex is set), a video is only tabbable if it\n // has controls enabled. Firefox is special as videos are always tabbable regardless\n // of whether there are controls or not.\n return this._platform.FIREFOX || element.hasAttribute('controls');\n }\n\n return element.tabIndex >= 0;\n }\n\n /**\n * Gets whether an element can be focused by the user.\n *\n * @param element Element to be checked.\n * @param config The config object with options to customize this method's behavior\n * @returns Whether the element is focusable.\n */\n isFocusable(element: HTMLElement, config?: IsFocusableConfig): boolean {\n // Perform checks in order of left to most expensive.\n // Again, naive approach that does not capture many edge cases and browser quirks.\n return (\n isPotentiallyFocusable(element) &&\n !this.isDisabled(element) &&\n (config?.ignoreVisibility || this.isVisible(element))\n );\n }\n}\n\n/**\n * Returns the frame element from a window object. Since browsers like MS Edge throw errors if\n * the frameElement property is being accessed from a different host address, this property\n * should be accessed carefully.\n */\nfunction getFrameElement(window: Window) {\n try {\n return window.frameElement as HTMLElement;\n } catch {\n return null;\n }\n}\n\n/** Checks whether the specified element has any geometry / rectangles. */\nfunction hasGeometry(element: HTMLElement): boolean {\n // Use logic from jQuery to check for an invisible element.\n // See https://github.com/jquery/jquery/blob/master/src/css/hiddenVisibleSelectors.js#L12\n return !!(\n element.offsetWidth ||\n element.offsetHeight ||\n (typeof element.getClientRects === 'function' && element.getClientRects().length)\n );\n}\n\n/** Gets whether an element's */\nfunction isNativeFormElement(element: Node) {\n let nodeName = element.nodeName.toLowerCase();\n return (\n nodeName === 'input' ||\n nodeName === 'select' ||\n nodeName === 'button' ||\n nodeName === 'textarea'\n );\n}\n\n/** Gets whether an element is an `<input type=\"hidden\">`. */\nfunction isHiddenInput(element: HTMLElement): boolean {\n return isInputElement(element) && element.type == 'hidden';\n}\n\n/** Gets whether an element is an anchor that has an href attribute. */\nfunction isAnchorWithHref(element: HTMLElement): boolean {\n return isAnchorElement(element) && element.hasAttribute('href');\n}\n\n/** Gets whether an element is an input element. */\nfunction isInputElement(element: HTMLElement): element is HTMLInputElement {\n return element.nodeName.toLowerCase() == 'input';\n}\n\n/** Gets whether an element is an anchor element. */\nfunction isAnchorElement(element: HTMLElement): element is HTMLAnchorElement {\n return element.nodeName.toLowerCase() == 'a';\n}\n\n/** Gets whether an element has a valid tabindex. */\nfunction hasValidTabIndex(element: HTMLElement): boolean {\n if (!element.hasAttribute('tabindex') || element.tabIndex === undefined) {\n return false;\n }\n\n let tabIndex = element.getAttribute('tabindex');\n return !!(tabIndex && !isNaN(parseInt(tabIndex, 10)));\n}\n\n/**\n * Returns the parsed tabindex from the element attributes instead of returning the\n * evaluated tabindex from the browsers defaults.\n */\nfunction getTabIndexValue(element: HTMLElement): number | null {\n if (!hasValidTabIndex(element)) {\n return null;\n }\n\n // See browser issue in Gecko https://bugzilla.mozilla.org/show_bug.cgi?id=1128054\n const tabIndex = parseInt(element.getAttribute('tabindex') || '', 10);\n\n return isNaN(tabIndex) ? -1 : tabIndex;\n}\n\n/** Checks whether the specified element is potentially tabbable on iOS */\nfunction isPotentiallyTabbableIOS(element: HTMLElement): boolean {\n let nodeName = element.nodeName.toLowerCase();\n let inputType = nodeName === 'input' && (element as HTMLInputElement).type;\n\n return (\n inputType === 'text' ||\n inputType === 'password' ||\n nodeName === 'select' ||\n nodeName === 'textarea'\n );\n}\n\n/**\n * Gets whether an element is potentially focusable without taking current visible/disabled state\n * into account.\n */\nfunction isPotentiallyFocusable(element: HTMLElement): boolean {\n // Inputs are potentially focusable *unless* they're type=\"hidden\".\n if (isHiddenInput(element)) {\n return false;\n }\n\n return (\n isNativeFormElement(element) ||\n isAnchorWithHref(element) ||\n element.hasAttribute('contenteditable') ||\n hasValidTabIndex(element)\n );\n}\n\n/** Gets the parent window of a DOM node with regards of being inside of an iframe. */\nfunction getWindow(node: HTMLElement): Window {\n // ownerDocument is null if `node` itself *is* a document.\n return (node.ownerDocument && node.ownerDocument.defaultView) || window;\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.io/license\n */\n\nimport {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';\nimport {_getFocusedElementPierceShadowDom} from '@angular/cdk/platform';\nimport {DOCUMENT} from '@angular/common';\nimport {\n AfterContentInit,\n Directive,\n ElementRef,\n Inject,\n Injectable,\n Input,\n NgZone,\n OnDestroy,\n DoCheck,\n SimpleChanges,\n OnChanges,\n} from '@angular/core';\nimport {take} from 'rxjs/operators';\nimport {InteractivityChecker} from '../interactivity-checker/interactivity-checker';\n\n/**\n * Class that allows for trapping focus within a DOM element.\n *\n * This class currently uses a relatively simple approach to focus trapping.\n * It assumes that the tab order is the same as DOM order, which is not necessarily true.\n * Things like `tabIndex > 0`, flex `order`, and shadow roots can cause the two to be misaligned.\n *\n * @deprecated Use `ConfigurableFocusTrap` instead.\n * @breaking-change 11.0.0\n */\nexport class FocusTrap {\n private _startAnchor: HTMLElement | null;\n private _endAnchor: HTMLElement | null;\n private _hasAttached = false;\n\n // Event listeners for the anchors. Need to be regular functions so that we can unbind them later.\n protected startAnchorListener = () => this.focusLastTabbableElement();\n protected endAnchorListener = () => this.focusFirstTabbableElement();\n\n /** Whether the focus trap is active. */\n get enabled(): boolean {\n return this._enabled;\n }\n set enabled(value: boolean) {\n this._enabled = value;\n\n if (this._startAnchor && this._endAnchor) {\n this._toggleAnchorTabIndex(value, this._startAnchor);\n this._toggleAnchorTabIndex(value, this._endAnchor);\n }\n }\n protected _enabled: boolean = true;\n\n constructor(\n readonly _element: HTMLElement,\n private _checker: InteractivityChecker,\n readonly _ngZone: NgZone,\n readonly _document: Document,\n deferAnchors = false,\n ) {\n if (!deferAnchors) {\n this.attachAnchors();\n }\n }\n\n /** Destroys the focus trap by cleaning up the anchors. */\n destroy() {\n const startAnchor = this._startAnchor;\n const endAnchor = this._endAnchor;\n\n if (startAnchor) {\n startAnchor.removeEventListener('focus', this.startAnchorListener);\n startAnchor.remove();\n }\n\n if (endAnchor) {\n endAnchor.removeEventListener('focus', this.endAnchorListener);\n endAnchor.remove();\n }\n\n this._startAnchor = this._endAnchor = null;\n this._hasAttached = false;\n }\n\n /**\n * Inserts the anchors into the DOM. This is usually done automatically\n * in the constructor, but can be deferred for cases like directives with `*ngIf`.\n * @returns Whether the focus trap managed to attach successfully. This may not be the case\n * if the target element isn't currently in the DOM.\n */\n attachAnchors(): boolean {\n // If we're not on the browser, there can be no focus to trap.\n if (this._hasAttached) {\n return true;\n }\n\n this._ngZone.runOutsideAngular(() => {\n if (!this._startAnchor) {\n this._startAnchor = this._createAnchor();\n this._startAnchor!.addEventListener('focus', this.startAnchorListener);\n }\n\n if (!this._endAnchor) {\n this._endAnchor = this._createAnchor();\n this._endAnchor!.addEventListener('focus', this.endAnchorListener);\n }\n });\n\n if (this._element.parentNode) {\n this._element.parentNode.insertBefore(this._startAnchor!, this._element);\n this._element.parentNode.insertBefore(this._endAnchor!, this._element.nextSibling);\n this._hasAttached = true;\n }\n\n return this._hasAttached;\n }\n\n /**\n * Waits for the zone to stabilize, then focuses the first tabbable element.\n * @returns Returns a promise that resolves with a boolean, depending\n * on whether focus was moved successfully.\n */\n focusInitialElementWhenReady(options?: FocusOptions): Promise<boolean> {\n return new Promise<boolean>(resolve => {\n this._executeOnStable(() => resolve(this.focusInitialElement(options)));\n });\n }\n\n /**\n * Waits for the zone to stabilize, then focuses\n * the first tabbable element within the focus trap region.\n * @returns Returns a promise that resolves with a boolean, depending\n * on whether focus was moved successfully.\n */\n focusFirstTabbableElementWhenReady(options?: FocusOptions): Promise<boolean> {\n return new Promise<boolean>(resolve => {\n this._executeOnStable(() => resolve(this.focusFirstTabbableElement(options)));\n });\n }\n\n /**\n * Waits for the zone to stabilize, then focuses\n * the last tabbable element within the focus trap region.\n * @returns Returns a promise that resolves with a boolean, depending\n * on whether focus was moved successfully.\n */\n focusLastTabbableElementWhenReady(options?: FocusOptions): Promise<boolean> {\n return new Promise<boolean>(resolve => {\n this._executeOnStable(() => resolve(this.focusLastTabbableElement(options)));\n });\n }\n\n /**\n * Get the specified boundary element of the trapped region.\n * @param bound The boundary to get (start or end of trapped region).\n * @returns The boundary element.\n */\n private _getRegionBoundary(bound: 'start' | 'end'): HTMLElement | null {\n // Contains the deprecated version of selector, for temporary backwards comparability.\n const markers = this._element.querySelectorAll(\n `[cdk-focus-region-${bound}], ` + `[cdkFocusRegion${bound}], ` + `[cdk-focus-${bound}]`,\n ) as NodeListOf<HTMLElement>;\n\n if (typeof ngDevMode === 'undefined' || ngDevMode) {\n for (let i = 0; i < markers.length; i++) {\n // @breaking-change 8.0.0\n if (markers[i].hasAttribute(`cdk-focus-${bound}`)) {\n console.warn(\n `Found use of deprecated attribute 'cdk-focus-${bound}', ` +\n `use 'cdkFocusRegion${bound}' instead. The deprecated ` +\n `attribute will be removed in 8.0.0.`,\n markers[i],\n );\n } else if (markers[i].hasAttribute(`cdk-focus-region-${bound}`)) {\n console.warn(\n `Found use of deprecated attribute 'cdk-focus-region-${bound}', ` +\n `use 'cdkFocusRegion${bound}' instead. The deprecated attribute ` +\n `will be removed in 8.0.0.`,\n markers[i],\n );\n }\n }\n }\n\n if (bound == 'start') {\n return markers.length ? markers[0] : this._getFirstTabbableElement(this._element);\n }\n return markers.length\n ? markers[markers.length - 1]\n : this._getLastTabbableElement(this._element);\n }\n\n /**\n * Focuses the element that should be focused when the focus trap is initialized.\n * @returns Whether focus was moved successfully.\n */\n focusInitialElement(options?: FocusOptions): boolean {\n // Contains the deprecated version of selector, for temporary backwards comparability.\n const redirectToElement = this._element.querySelector(\n `[cdk-focus-initial], ` + `[cdkFocusInitial]`,\n ) as HTMLElement;\n\n if (redirectToElement) {\n // @breaking-change 8.0.0\n if (\n (typeof ngDevMode === 'undefined' || ngDevMode) &&\n redirectToElement.hasAttribute(`cdk-focus-initial`)\n ) {\n console.warn(\n `Found use of deprecated attribute 'cdk-focus-initial', ` +\n `use 'cdkFocusInitial' instead. The deprecated attribute ` +\n `will be removed in 8.0.0`,\n redirectToElement,\n );\n }\n\n // Warn the consumer if the element they've pointed to\n // isn't focusable, when not in production mode.\n if (\n (typeof ngDevMode === 'undefined' || ngDevMode) &&\n !this._checker.isFocusable(redirectToElement)\n ) {\n console.warn(`Element matching '[cdkFocusInitial]' is not focusable.`, redirectToElement);\n }\n\n if (!this._checker.isFocusable(redirectToElement)) {\n const focusableChild = this._getFirstTabbableElement(redirectToElement) as HTMLElement;\n focusableChild?.focus(options);\n return !!focusableChild;\n }\n\n redirectToElement.focus(options);\n return true;\n }\n\n return this.focusFirstTabbableElement(options);\n }\n\n /**\n * Focuses the first tabbable element within the focus trap region.\n * @returns Whether focus was moved successfully.\n */\n focusFirstTabbableElement(options?: FocusOptions): boolean {\n const redirectToElement = this._getRegionBoundary('start');\n\n if (redirectToElement) {\n redirectToElement.focus(options);\n }\n\n return !!redirectToElement;\n }\n\n /**\n * Focuses the last tabbable element within the focus trap region.\n * @returns Whether focus was moved successfully.\n */\n focusLastTabbableElement(options?: FocusOptions): boolean {\n const redirectToElement = this._getRegionBoundary('end');\n\n if (redirectToElement) {\n redirectToElement.focus(options);\n }\n\n return !!redirectToElement;\n }\n\n /**\n * Checks whether the focus trap has successfully been attached.\n */\n hasAttached(): boolean {\n return this._hasAttached;\n }\n\n /** Get the first tabbable element from a DOM subtree (inclusive). */\n private _getFirstTabbableElement(root: HTMLElement): HTMLElement | null {\n if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {\n return root;\n }\n\n const children = root.children;\n\n for (let i = 0; i < children.length; i++) {\n const tabbableChild =\n children[i].nodeType === this._document.ELEMENT_NODE\n ? this._getFirstTabbableElement(children[i] as HTMLElement)\n : null;\n\n if (tabbableChild) {\n return tabbableChild;\n }\n }\n\n return null;\n }\n\n /** Get the last tabbable element from a DOM subtree (inclusive). */\n private _getLastTabbableElement(root: HTMLElement): HTMLElement | null {\n if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {\n return root;\n }\n\n // Iterate in reverse DOM order.\n const children = root.children;\n\n for (let i = children.length - 1; i >= 0; i--) {\n const tabbableChild =\n children[i].nodeType === this._document.ELEMENT_NODE\n ? this._getLastTabbableElement(children[i] as HTMLElement)\n : null;\n\n if (tabbableChild) {\n return tabbableChild;\n }\n }\n\n return null;\n }\n\n /** Creates an anchor element. */\n private _createAnchor(): HTMLElement {\n const anchor = this._document.createElement('div');\n this._toggleAnchorTabIndex(this._enabled, anchor);\n anchor.classList.add('cdk-visually-hidden');\n anchor.classList.add('cdk-focus-trap-anchor');\n anchor.setAttribute('aria-hidden', 'true');\n return anchor;\n }\n\n /**\n * Toggles the `tabindex` of an anchor, based on the enabled state of the focus trap.\n * @param isEnabled Whether the focus trap is enabled.\n * @param anchor Anchor on which to toggle the tabindex.\n */\n private _toggleAnchorTabIndex(isEnabled: boolean, anchor: HTMLElement) {\n // Remove the tabindex completely, rather than setting it to -1, because if the\n // element has a tabindex, the user might still hit it when navigating with the arrow keys.\n isEnabled ? anchor.setAttribute('tabindex', '0') : anchor.removeAttribute('tabindex');\n }\n\n /**\n * Toggles the`tabindex` of both anchors to either trap Tab focus or allow it to escape.\n * @param enabled: Whether the anchors should trap Tab.\n */\n protected toggleAnchors(enabled: boolean) {\n if (this._startAnchor && this._endAnchor) {\n this._toggleAnchorTabIndex(enabled, this._startAnchor);\n this._toggleAnchorTabIndex(enabled, this._endAnchor);\n }\n }\n\n /** Executes a function when the zone is stable. */\n private _executeOnStable(fn: () => any): void {\n if (this._ngZone.isStable) {\n fn();\n } else {\n this._ngZone.onStable.pipe(take(1)).subscribe(fn);\n }\n }\n}\n\n/**\n * Factory that allows easy instantiation of focus traps.\n * @deprecated Use `ConfigurableFocusTrapFactory` instead.\n * @breaking-change 11.0.0\n */\n@Injectable({providedIn: 'root'})\nexport class FocusTrapFactory {\n private _document: Document;\n\n constructor(\n private _checker: InteractivityChecker,\n private _ngZone: NgZone,\n @Inject(DOCUMENT) _document: any,\n ) {\n this._document = _document;\n }\n\n /**\n * Creates a focus-trapped region around the given element.\n * @param element The element around which focus will be trapped.\n * @param deferCaptureElements Defers the creation of focus-capturing elements to be done\n * manually by the user.\n * @returns The created focus trap instance.\n */\n create(element: HTMLElement, deferCaptureElements: boolean = false): FocusTrap {\n return new FocusTrap(\n element,\n this._checker,\n this._ngZone,\n this._document,\n deferCaptureElements,\n );\n }\n}\n\n/** Directive for trapping focus within a region. */\n@Directive({\n selector: '[cdkTrapFocus]',\n exportAs: 'cdkTrapFocus',\n})\nexport class CdkTrapFocus implements OnDestroy, AfterContentInit, OnChanges, DoCheck {\n /** Underlying FocusTrap instance. */\n focusTrap: FocusTrap;\n\n /** Previously focused element to restore focus to upon destroy when using autoCapture. */\n private _previouslyFocusedElement: HTMLElement | null = null;\n\n /** Whether the focus trap is active. */\n @Input('cdkTrapFocus')\n get enabled(): boolean {\n return this.focusTrap.enabled;\n }\n set enabled(value: BooleanInput) {\n this.focusTrap.enabled = coerceBooleanProperty(value);\n }\n\n /**\n * Whether the directive should automatically move focus into the trapped region upon\n * initialization and return focus to the previous activeElement upon destruction.\n */\n @Input('cdkTrapFocusAutoCapture')\n get autoCapture(): boolean {\n return this._autoCapture;\n }\n set autoCapture(value: BooleanInput) {\n this._autoCapture = coerceBooleanProperty(value);\n }\n private _autoCapture: boolean;\n\n constructor(\n private _elementRef: ElementRef<HTMLElement>,\n private _focusTrapFactory: FocusTrapFactory,\n /**\n * @deprecated No longer being used. To be removed.\n * @breaking-change 13.0.0\n */\n @Inject(DOCUMENT) _document: any,\n ) {\n this.focusTrap = this._focusTrapFactory.create(this._elementRef.nativeElement, true);\n }\n\n ngOnDestroy() {\n this.focusTrap.destroy();\n\n // If we stored a previously focused element when using autoCapture, return focus to that\n // element now that the trapped region is being destroyed.\n if (this._previouslyFocusedElement) {\n this._previouslyFocusedElement.focus();\n this._previouslyFocusedElement = null;\n }\n }\n\n ngAfterContentInit() {\n this.focusTrap.attachAnchors();\n\n if (this.autoCapture) {\n this._captureFocus();\n }\n }\n\n ngDoCheck() {\n if (!this.focusTrap.hasAttached()) {\n this.focusTrap.attachAnchors();\n }\n }\n\n ngOnChanges(changes: SimpleChanges) {\n const autoCaptureChange = changes['autoCapture'];\n\n if (\n autoCaptureChange &&\n !autoCaptureChange.firstChange &&\n this.autoCapture &&\n this.focusTrap.hasAttached()\n ) {\n this._captureFocus();\n }\n }\n\n private _captureFocus() {\n this._previouslyFocusedElement = _getFocusedElementPierceShadowDom();\n this.focusTrap.focusInitialElementWhenReady();\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.io/license\n */\n\nimport {NgZone} from '@angular/core';\nimport {InteractivityChecker} from '../interactivity-checker/interactivity-checker';\nimport {FocusTrap} from './focus-trap';\nimport {FocusTrapManager, ManagedFocusTrap} from './focus-trap-manager';\nimport {FocusTrapInertStrategy} from './focus-trap-inert-strategy';\nimport {ConfigurableFocusTrapConfig} from './configurable-focus-trap-config';\n\n/**\n * Class that allows for trapping focus within a DOM element.\n *\n * This class uses a strategy pattern that determines how it traps focus.\n * See FocusTrapInertStrategy.\n */\nexport class ConfigurableFocusTrap extends FocusTrap implements ManagedFocusTrap {\n /** Whether the FocusTrap is enabled. */\n override get enabled(): boolean {\n return this._enabled;\n }\n override set enabled(value: boolean) {\n this._enabled = value;\n if (this._enabled) {\n this._focusTrapManager.register(this);\n } else {\n this._focusTrapManager.deregister(this);\n }\n }\n\n constructor(\n _element: HTMLElement,\n _checker: InteractivityChecker,\n _ngZone: NgZone,\n _document: Document,\n private _focusTrapManager: FocusTrapManager,\n private _inertStrategy: FocusTrapInertStrategy,\n config: ConfigurableFocusTrapConfig,\n ) {\n super(_element, _checker, _ngZone, _document, config.defer);\n this._focusTrapManager.register(this);\n }\n\n /** Notifies the FocusTrapManager that this FocusTrap will be destroyed. */\n override destroy() {\n this._focusTrapManager.deregister(this);\n super.destroy();\n }\n\n /** @docs-private Implemented as part of ManagedFocusTrap. */\n _enable() {\n this._inertStrategy.preventFocus(this);\n this.toggleAnchors(true);\n }\n\n /** @docs-private Implemented as part of ManagedFocusTrap. */\n _disable() {\n this._inertStrategy.allowFocus(this);\n this.toggleAnchors(false);\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.io/license\n */\nimport {InjectionToken} from '@angular/core';\nimport {FocusTrap} from './focus-trap';\n\n/** The injection token used to specify the inert strategy. */\nexport const FOCUS_TRAP_INERT_STRATEGY = new InjectionToken<FocusTrapInertStrategy>(\n 'FOCUS_TRAP_INERT_STRATEGY',\n);\n\n/**\n * A strategy that dictates how FocusTrap should prevent elements\n * outside of the FocusTrap from being focused.\n */\nexport interface FocusTrapInertStrategy {\n /** Makes all elements outside focusTrap unfocusable. */\n preventFocus(focusTrap: FocusTrap): void;\n /** Reverts elements made unfocusable by preventFocus to their previous state. */\n allowFocus(focusTrap: FocusTrap): void;\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.io/license\n */\n\nimport {FocusTrapInertStrategy} from './focus-trap-inert-strategy';\nimport {ConfigurableFocusTrap} from './configurable-focus-trap';\n\n/**\n * Lightweight FocusTrapInertStrategy that adds a document focus event\n * listener to redirect focus back inside the FocusTrap.\n */\nexport class EventListenerFocusTrapInertStrategy implements FocusTrapInertStrategy {\n /** Focus event handler. */\n private _listener: ((e: FocusEvent) => void) | null = null;\n\n /** Adds a document event listener that keeps focus inside the FocusTrap. */\n preventFocus(focusTrap: ConfigurableFocusTrap): void {\n // Ensure there's only one listener per document\n if (this._listener) {\n focusTrap._document.removeEventListener('focus', this._listener!, true);\n }\n\n this._listener = (e: FocusEvent) => this._trapFocus(focusTrap, e);\n focusTrap._ngZone.runOutsideAngular(() => {\n focusTrap._document.addEventListener('focus', this._listener!, true);\n });\n }\n\n /** Removes the event listener added in preventFocus. */\n allowFocus(focusTrap: ConfigurableFocusTrap): void {\n if (!this._listener) {\n return;\n }\n focusTrap._document.removeEventListener('focus', this._listener!, true);\n this._listener = null;\n }\n\n /**\n * Refocuses the first element in the FocusTrap if the focus event target was outside\n * the FocusTrap.\n *\n * This is an event listener callback. The event listener is added in runOutsideAngular,\n * so all this code runs outside Angular as well.\n */\n private _trapFocus(focusTrap: ConfigurableFocusTrap, event: FocusEvent) {\n const target = event.target as HTMLElement;\n const focusTrapRoot = focusTrap._element;\n\n // Don't refocus if target was in an overlay, because the overlay might be associated\n // with an element inside the FocusTrap, ex. mat-select.\n if (target && !focusTrapRoot.contains(target) && !target.closest?.('div.cdk-overlay-pane')) {\n // Some legacy FocusTrap usages have logic that focuses some element on the page\n // just before FocusTrap is destroyed. For backwards compatibility, wait\n // to be sure FocusTrap is still enabled before refocusing.\n setTimeout(() => {\n // Check whether focus wasn't put back into the focus trap while the timeout was pending.\n if (focusTrap.enabled && !focusTrapRoot.contains(focusTrap._document.activeElement)) {\n focusTrap.focusFirstTabbableElement();\n }\n });\n }\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.io/license\n */\n\nimport {Injectable} from '@angular/core';\n\n/**\n * A FocusTrap managed by FocusTrapManager.\n * Implemented by ConfigurableFocusTrap to avoid circular dependency.\n */\nexport interface ManagedFocusTrap {\n _enable(): void;\n _disable(): void;\n focusInitialElementWhenReady(): Promise<boolean>;\n}\n\n/** Injectable that ensures only the most recently enabled FocusTrap is active. */\n@Injectable({providedIn: 'root'})\nexport class FocusTrapManager {\n // A stack of the FocusTraps on the page. Only the FocusTrap at the\n // top of the stack is active.\n private _focusTrapStack: ManagedFocusTrap[] = [];\n\n /**\n * Disables the FocusTrap at the top of the stack, and then pushes\n * the new FocusTrap onto the stack.\n */\n register(focusTrap: ManagedFocusTrap): void {\n // Dedupe focusTraps that register multiple times.\n this._focusTrapStack = this._focusTrapStack.filter(ft => ft !== focusTrap);\n\n let stack = this._focusTrapStack;\n\n if (stack.length) {\n stack[stack.length - 1]._disable();\n }\n\n stack.push(focusTrap);\n focusTrap._enable();\n }\n\n /**\n * Removes the FocusTrap from the stack, and activates the\n * FocusTrap that is the new top of the stack.\n */\n deregister(focusTrap: ManagedFocusTrap): void {\n focusTrap._disable();\n\n const stack = this._focusTrapStack;\n\n const i = stack.indexOf(focusTrap);\n if (i !== -1) {\n stack.splice(i, 1);\n if (stack.length) {\n stack[stack.length - 1]._enable();\n }\n }\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.io/license\n */\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable, Optional, NgZone} from '@angular/core';\nimport {InteractivityChecker} from '../interactivity-checker/interactivity-checker';\nimport {ConfigurableFocusTrap} from './configurable-focus-trap';\nimport {ConfigurableFocusTrapConfig} from './configurable-focus-trap-config';\nimport {FOCUS_TRAP_INERT_STRATEGY, FocusTrapInertStrategy} from './focus-trap-inert-strategy';\nimport {EventListenerFocusTrapInertStrategy} from './event-listener-inert-strategy';\nimport {FocusTrapManager} from './focus-trap-manager';\n\n/** Factory that allows easy instantiation of configurable focus traps. */\n@Injectable({providedIn: 'root'})\nexport class ConfigurableFocusTrapFactory {\n private _document: Document;\n private _inertStrategy: FocusTrapInertStrategy;\n\n constructor(\n private _checker: InteractivityChecker,\n private _ngZone: NgZone,\n private _focusTrapManager: FocusTrapManager,\n @Inject(DOCUMENT) _document: any,\n @Optional() @Inject(FOCUS_TRAP_INERT_STRATEGY) _inertStrategy?: FocusTrapInertStrategy,\n ) {\n this._document = _document;\n // TODO split up the strategies into different modules, similar to DateAdapter.\n this._inertStrategy = _inertStrategy || new EventListenerFocusTrapInertStrategy();\n }\n\n /**\n * Creates a focus-trapped region around the given element.\n * @param element The element around which focus will be trapped.\n * @param config The focus trap configuration.\n * @returns The created focus trap instance.\n */\n create(element: HTMLElement, config?: ConfigurableFocusTrapConfig): ConfigurableFocusTrap;\n\n /**\n * @deprecated Pass a config object instead of the `deferCaptureElements` flag.\n * @breaking-change 11.0.0\n */\n create(element: HTMLElement, deferCaptureElements: boolean): ConfigurableFocusTrap;\n\n create(\n element: HTMLElement,\n config: ConfigurableFocusTrapConfig | boolean = {defer: false},\n ): ConfigurableFocusTrap {\n let configObject: ConfigurableFocusTrapConfig;\n if (typeof config === 'boolean') {\n configObject = {defer: config};\n } else {\n configObject = config;\n }\n return new ConfigurableFocusTrap(\n element,\n this._checker,\n this._ngZone,\n this._document,\n this._focusTrapManager,\n this._inertStrategy,\n configObject,\n );\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.io/license\n */\n\n/** Gets whether an event could be a faked `mousedown` event dispatched by a screen reader. */\nexport function isFakeMousedownFromScreenReader(event: MouseEvent): boolean {\n // Some screen readers will dispatch a fake `mousedown` event when pressing enter or space on\n // a clickable element. We can distinguish these events when `event.buttons` is zero, or\n // `event.detail` is zero depending on the browser:\n // - `event.buttons` works on Firefox, but fails on Chrome.\n // - `detail` works on Chrome, but fails on Firefox.\n return event.buttons === 0 || event.detail === 0;\n}\n\n/** Gets whether an event could be a faked `touchstart` event dispatched by a screen reader. */\nexport function isFakeTouchstartFromScreenReader(event: TouchEvent): boolean {\n const touch: Touch | undefined =\n (event.touches && event.touches[0]) || (event.changedTouches && event.changedTouches[0]);\n\n // A fake `touchstart` can be distinguished from a real one by looking at the `identifier`\n // which is typically >= 0 on a real device versus -1 from a screen reader. Just to be safe,\n // we can also look at `radiusX` and `radiusY`. This behavior was observed against a Windows 10\n // device with a touch screen running NVDA v2020.4 and Firefox 85 or Chrome 88.\n return (\n !!touch &&\n touch.identifier === -1 &&\n (touch.radiusX == null || touch.radiusX === 1) &&\n (touch.radiusY == null || touch.radiusY === 1)\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.io/license\n */\n\nimport {ALT, CONTROL, MAC_META, META, SHIFT} from '@angular/cdk/keycodes';\nimport {Inject, Injectable, InjectionToken, OnDestroy, Optional, NgZone} from '@angular/core';\nimport {normalizePassiveListenerOptions, Platform, _getEventTarget} from '@angular/cdk/platform';\nimport {DOCUMENT} from '@angular/common';\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<InputModalityDetectorOptions>(\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 = normalizePassiveListenerOptions({\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 /** Emits whenever an input modality is detected. */\n readonly modalityDetected: Observable<InputModality>;\n\n /** Emits when the input modality changes. */\n readonly modalityChanged: Observable<InputModality>;\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<InputModality>(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(\n private readonly _platform: Platform,\n ngZone: NgZone,\n @Inject(DOCUMENT) document: Document,\n @Optional()\n @Inject(INPUT_MODALITY_DETECTOR_OPTIONS)\n options?: InputModalityDetectorOptions,\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 (_platform.isBrowser) {\n ngZone.runOutsideAngular(() => {\n document.addEventListener('keydown', this._onKeydown, modalityEventListenerOptions);\n document.addEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);\n document.addEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);\n });\n }\n }\n\n ngOnDestroy() {\n this._modality.complete();\n\n if (this._platform.isBrowser) {\n document.removeEventListener('keydown', this._onKeydown, modalityEventListenerOptions);\n document.removeEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);\n document.removeEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);\n }\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.io/license\n */\n\nimport {InjectionToken} from '@angular/core';\n\n// The tokens for the live announcer are defined in a separate file from LiveAnnouncer\n// as a workaround for https://github.com/angular/angular/issues/22559\n\n/** Possible politeness levels. */\nexport type AriaLivePoliteness = 'off' | 'polite' | 'assertive';\n\nexport const LIVE_ANNOUNCER_ELEMENT_TOKEN = new InjectionToken<HTMLElement | null>(\n 'liveAnnouncerElement',\n {\n providedIn: 'root',\n factory: LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY,\n },\n);\n\n/** @docs-private */\nexport function LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY(): null {\n return null;\n}\n\n/** Object that can be used to configure the default options for the LiveAnnouncer. */\nexport interface LiveAnnouncerDefaultOptions {\n /** Default politeness for the announcements. */\n politeness?: AriaLivePoliteness;\n\n /** Default duration for the announcement messages. */\n duration?: number;\n}\n\n/** Injection token that can be used to configure the default options for the LiveAnnouncer. */\nexport const LIVE_ANNOUNCER_DEFAULT_OPTIONS = new InjectionToken<LiveAnnouncerDefaultOptions>(\n 'LIVE_ANNOUNCER_DEFAULT_OPTIONS',\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.io/license\n */\n\nimport {ContentObserver} from '@angular/cdk/observers';\nimport {DOCUMENT} from '@angular/common';\nimport {\n Directive,\n ElementRef,\n Inject,\n Injectable,\n Input,\n NgZone,\n OnDestroy,\n Optional,\n} from '@angular/core';\nimport {Subscription} from 'rxjs';\nimport {\n AriaLivePoliteness,\n LiveAnnouncerDefaultOptions,\n LIVE_ANNOUNCER_ELEMENT_TOKEN,\n LIVE_ANNOUNCER_DEFAULT_OPTIONS,\n} from './live-announcer-tokens';\n\nlet uniqueIds = 0;\n\n@Injectable({providedIn: 'root'})\nexport class LiveAnnouncer implements OnDestroy {\n private _liveElement: HTMLElement;\n private _document: Document;\n private _previousTimeout: number;\n private _currentPromise: Promise<void> | undefined;\n private _currentResolve: (() => void) | undefined;\n\n constructor(\n @Optional() @Inject(LIVE_ANNOUNCER_ELEMENT_TOKEN) elementToken: any,\n private _ngZone: NgZone,\n @Inject(DOCUMENT) _document: any,\n @Optional()\n @Inject(LIVE_ANNOUNCER_DEFAULT_OPTIONS)\n private _defaultOptions?: LiveAnnouncerDefaultOptions,\n ) {\n // We inject the live element and document as `any` because the constructor signature cannot\n // reference browser globals (HTMLElement, Document) on non-browser environments, since having\n // a class decorator causes TypeScript to preserve the constructor signature types.\n this._document = _document;\n this._liveElement = elementToken || this._createLiveElement();\n }\n\n /**\n * Announces a message to screen readers.\n * @param message Message to be announced to the screen reader.\n * @returns Promise that will be resolved when the message is added to the DOM.\n */\n announce(message: string): Promise<void>;\n\n /**\n * Announces a message to screen readers.\n * @param message Message to be announced to the screen reader.\n * @param politeness The politeness of the announcer element.\n * @returns Promise that will be resolved when the message is added to the DOM.\n */\n announce(message: string, politeness?: AriaLivePoliteness): Promise<void>;\n\n /**\n * Announces a message to screen readers.\n * @param message Message to be announced to the screen reader.\n * @param duration Time in milliseconds after which to clear out the announcer element. Note\n * that this takes effect after the message has been added to the DOM, which can be up to\n * 100ms after `announce` has been called.\n * @returns Promise that will be resolved when the message is added to the DOM.\n */\n announce(message: string, duration?: number): Promise<void>;\n\n /**\n * Announces a message to screen readers.\n * @param message Message to be announced to the screen reader.\n * @param politeness The politeness of the announcer element.\n * @param duration Time in milliseconds after which to clear out the announcer element. Note\n * that this takes effect after the message has been added to the DOM, which can be up to\n * 100ms after `announce` has been called.\n * @returns Promise that will be resolved when the message is added to the DOM.\n */\n announce(message: string, politeness?: AriaLivePoliteness, duration?: number): Promise<void>;\n\n announce(message: string, ...args: any[]): Promise<void> {\n const defaultOptions = this._defaultOptions;\n let politeness: AriaLivePoliteness | undefined;\n let duration: number | undefined;\n\n if (args.length === 1 && typeof args[0] === 'number') {\n duration = args[0];\n } else {\n [politeness, duration] = args;\n }\n\n this.clear();\n clearTimeout(this._previousTimeout);\n\n if (!politeness) {\n politeness =\n defaultOptions && defaultOptions.politeness ? defaultOptions.politeness : 'polite';\n }\n\n if (duration == null && defaultOptions) {\n duration = defaultOptions.duration;\n }\n\n // TODO: ensure changing the politeness works on all environments we support.\n this._liveElement.setAttribute('aria-live', politeness);\n\n if (this._liveElement.id) {\n this._exposeAnnouncerToModals(this._liveElement.id);\n }\n\n // This 100ms timeout is necessary for some browser + screen-reader combinations:\n // - Both JAWS and NVDA over IE11 will not announce anything without a non-zero timeout.\n // - With Chrome and IE11 with NVDA or JAWS, a repeated (identical) message won't be read a\n // second time without clearing and then using a non-zero delay.\n // (using JAWS 17 at time of this writing).\n return this._ngZone.runOutsideAngular(() => {\n if (!this._currentPromise) {\n this._currentPromise = new Promise(resolve => (this._currentResolve = resolve));\n }\n\n clearTimeout(this._previousTimeout);\n this._previousTimeout = setTimeout(() => {\n this._liveElement.textContent = message;\n\n if (typeof duration === 'number') {\n this._previousTimeout = setTimeout(() => this.clear(), duration);\n }\n\n this._currentResolve!();\n this._currentPromise = this._currentResolve = undefined;\n }, 100);\n\n return this._currentPromise;\n });\n }\n\n /**\n * Clears the current text from the announcer element. Can be used to prevent\n * screen readers from reading the text out again while the user is going\n * through the page landmarks.\n */\n clear() {\n if (this._liveElement) {\n this._liveElement.textContent = '';\n }\n }\n\n ngOnDestroy() {\n clearTimeout(this._previousTimeout);\n this._liveElement?.remove();\n this._liveElement = null!;\n this._currentResolve?.();\n this._currentPromise = this._currentResolve = undefined;\n }\n\n private _createLiveElement(): HTMLElement {\n const elementClass = 'cdk-live-announcer-element';\n const previousElements = this._document.getElementsByClassName(elementClass);\n const liveEl = this._document.createElement('div');\n\n // Remove any old containers. This can happen when coming in from a server-side-rendered page.\n for (let i = 0; i < previousElements.length; i++) {\n previousElements[i].remove();\n }\n\n liveEl.classList.add(elementClass);\n liveEl.classList.add('cdk-visually-hidden');\n\n liveEl.setAttribute('aria-atomic', 'true');\n liveEl.setAttribute('aria-live', 'polite');\n liveEl.id = `cdk-live-announcer-${uniqueIds++}`;\n\n this._document.body.appendChild(liveEl);\n\n return liveEl;\n }\n\n /**\n * Some browsers won't expose the accessibility node of the live announcer element if there is an\n * `aria-modal` and the live announcer is outside of it. This method works around the issue by\n * pointing the `aria-owns` of all modals to the live announcer element.\n */\n private _exposeAnnouncerToModals(id: string) {\n // TODO(http://github.com/angular/components/issues/26853): consider de-duplicating this with\n // the `SnakBarContainer` and other usages.\n //\n // Note that the selector here is limited to CDK overlays at the moment in order to reduce the\n // section of the DOM we need to look through. This should cover all the cases we support, but\n // the selector can be expanded if it turns out to be too narrow.\n const modals = this._document.querySelectorAll(\n 'body > .cdk-overlay-container [aria-modal=\"true\"]',\n );\n\n for (let i = 0; i < modals.length; i++) {\n const modal = modals[i];\n const ariaOwns = modal.getAttribute('aria-owns');\n\n if (!ariaOwns) {\n modal.setAttribute('aria-owns', id);\n } else if (ariaOwns.indexOf(id) === -1) {\n modal.setAttribute('aria-owns', ariaOwns + ' ' + id);\n }\n }\n }\n}\n\n/**\n * A directive that works similarly to aria-live, but uses the LiveAnnouncer to ensure compatibility\n * with a wider range of browsers and screen readers.\n */\n@Directive({\n selector: '[cdkAriaLive]',\n exportAs: 'cdkAriaLive',\n})\nexport class CdkAriaLive implements OnDestroy {\n /** The aria-live politeness level to use when announcing messages. */\n @Input('cdkAriaLive')\n get politeness(): AriaLivePoliteness {\n return this._politeness;\n }\n set politeness(value: AriaLivePoliteness) {\n this._politeness = value === 'off' || value === 'assertive' ? value : 'polite';\n if (this._politeness === 'off') {\n if (this._subscription) {\n this._subscription.unsubscribe();\n this._subscription = null;\n }\n } else if (!this._subscription) {\n this._subscription = this._ngZone.runOutsideAngular(() => {\n return this._contentObserver.observe(this._elementRef).subscribe(() => {\n // Note that we use textContent here, rather than innerText, in order to avoid a reflow.\n const elementText = this._elementRef.nativeElement.textContent;\n\n // The `MutationObserver` fires also for attribute\n // changes which we don't want to announce.\n if (elementText !== this._previousAnnouncedText) {\n this._liveAnnouncer.announce(elementText, this._politeness, this.duration);\n this._previousAnnouncedText = elementText;\n }\n });\n });\n }\n }\n private _politeness: AriaLivePoliteness = 'polite';\n\n /** Time in milliseconds after which to clear out the announcer element. */\n @Input('cdkAriaLiveDuration') duration: number;\n\n private _previousAnnouncedText?: string;\n private _subscription: Subscription | null;\n\n constructor(\n private _elementRef: ElementRef,\n private _liveAnnouncer: LiveAnnouncer,\n private _contentObserver: ContentObserver,\n private _ngZone: NgZone,\n ) {}\n\n ngOnDestroy() {\n if (this._subscription) {\n this._subscription.unsubscribe();\n }\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.io/license\n */\n\nimport {\n Platform,\n normalizePassiveListenerOptions,\n _getShadowRoot,\n _getEventTarget,\n} from '@angular/cdk/platform';\nimport {\n Directive,\n ElementRef,\n EventEmitter,\n Inject,\n Injectable,\n InjectionToken,\n NgZone,\n OnDestroy,\n Optional,\n Output,\n AfterViewInit,\n} from '@angular/core';\nimport {Observable, of as observableOf, Subject, Subscription} from 'rxjs';\nimport {takeUntil} from 'rxjs/operators';\nimport {coerceElement} from '@angular/cdk/coercion';\nimport {DOCUMENT} from '@angular/common';\nimport {InputModalityDetector, TOUCH_BUFFER_MS} from '../input-modality/input-modality-detector';\n\nexport type FocusOrigin = 'touch' | 'mouse' | 'keyboard' | 'program' | null;\n\n/**\n * Corresponds to the options that can be passed to the native `focus` event.\n * via https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/focus\n */\nexport interface FocusOptions {\n /** Whether the browser should scroll to the element when it is focused. */\n preventScroll?: boolean;\n}\n\n/** Detection mode used for attributing the origin of a focus event. */\nexport const enum FocusMonitorDetectionMode {\n /**\n * Any mousedown, keydown, or touchstart event that happened in the previous\n * tick or the current tick will be used to assign a focus event's origin (to\n * either mouse, keyboard, or touch). This is the default option.\n */\n IMMEDIATE,\n /**\n * A focus event's origin is always attributed to the last corresponding\n * mousedown, keydown, or touchstart event, no matter how long ago it occurred.\n */\n EVENTUAL,\n}\n\n/** Injectable service-level options for FocusMonitor. */\nexport interface FocusMonitorOptions {\n detectionMode?: FocusMonitorDetectionMode;\n}\n\n/** InjectionToken for FocusMonitorOptions. */\nexport const FOCUS_MONITOR_DEFAULT_OPTIONS = new InjectionToken<FocusMonitorOptions>(\n 'cdk-focus-monitor-default-options',\n);\n\ntype MonitoredElementInfo = {\n checkChildren: boolean;\n readonly subject: Subject<FocusOrigin>;\n rootNode: HTMLElement | ShadowRoot | Document;\n};\n\n/**\n * Event listener options that enable capturing and also\n * mark the listener as passive if the browser supports it.\n */\nconst captureEventListenerOptions = normalizePassiveListenerOptions({\n passive: true,\n capture: true,\n});\n\n/** Monitors mouse and keyboard events to determine the cause of focus events. */\n@Injectable({providedIn: 'root'})\nexport class FocusMonitor implements OnDestroy {\n /** The focus origin that the next focus event is a result of. */\n private _origin: FocusOrigin = null;\n\n /** The FocusOrigin of the last focus event tracked by the FocusMonitor. */\n private _lastFocusOrigin: FocusOrigin;\n\n /** Whether the window has just been focused. */\n private _windowFocused = false;\n\n /** The timeout id of the window focus timeout. */\n private _windowFocusTimeoutId: number;\n\n /** The timeout id of the origin clearing timeout. */\n private _originTimeoutId: number;\n\n /**\n * Whether the origin was determined via a touch interaction. Necessary as properly attributing\n * focus events to touch interactions requires special logic.\n */\n private _originFromTouchInteraction = false;\n\n /** Map of elements being monitored to their info. */\n private _elementInfo = new Map<HTMLElement, MonitoredElementInfo>();\n\n /** The number of elements currently being monitored. */\n private _monitoredElementCount = 0;\n\n /**\n * Keeps track of the root nodes to which we've currently bound a focus/blur handler,\n * as well as the number of monitored elements that they contain. We have to treat focus/blur\n * handlers differently from the rest of the events, because the browser won't emit events\n * to the document when focus moves inside of a shadow root.\n */\n private _rootNodeFocusListenerCount = new Map<HTMLElement | Document | ShadowRoot, number>();\n\n /**\n * The specified detection mode, used for attributing the origin of a focus\n * event.\n */\n private readonly _detectionMode: FocusMonitorDetectionMode;\n\n /**\n * Event listener for `focus` events on the window.\n * Needs to be an arrow function in order to preserve the context when it gets bound.\n */\n private _windowFocusListener = () => {\n // Make a note of when the window regains focus, so we can\n // restore the origin info for the focused element.\n this._windowFocused = true;\n this._windowFocusTimeoutId = window.setTimeout(() => (this._windowFocused = false));\n };\n\n /** Used to reference correct document/window */\n protected _document?: Document;\n\n /** Subject for stopping our InputModalityDetector subscription. */\n private readonly _stopInputModalityDetector = new Subject<void>();\n\n constructor(\n private _ngZone: NgZone,\n private _platform: Platform,\n private readonly _inputModalityDetector: InputModalityDetector,\n /** @breaking-change 11.0.0 make document required */\n @Optional() @Inject(DOCUMENT) document: any | null,\n @Optional() @Inject(FOCUS_MONITOR_DEFAULT_OPTIONS) options: FocusMonitorOptions | null,\n ) {\n this._document = document;\n this._detectionMode = options?.detectionMode || FocusMonitorDetectionMode.IMMEDIATE;\n }\n /**\n * Event listener for `focus` and 'blur' events on the document.\n * Needs to be an arrow function in order to preserve the context when it gets bound.\n */\n private _rootNodeFocusAndBlurListener = (event: Event) => {\n const target = _getEventTarget<HTMLElement>(event);\n\n // We need to walk up the ancestor chain in order to support `checkChildren`.\n for (let element = target; element; element = element.parentElement) {\n if (event.type === 'focus') {\n this._onFocus(event as FocusEvent, element);\n } else {\n this._onBlur(event as FocusEvent, element);\n }\n }\n };\n\n /**\n * Monitors focus on an element and applies appropriate CSS classes.\n * @param element The element to monitor\n * @param checkChildren Whether to count the element as focused when its children are focused.\n * @returns An observable that emits when the focus state of the element changes.\n * When the element is blurred, null will be emitted.\n */\n monitor(element: HTMLElement, checkChildren?: boolean): Observable<FocusOrigin>;\n\n /**\n * Monitors focus on an element and applies appropriate CSS classes.\n * @param element The element to monitor\n * @param checkChildren Whether to count the element as focused when its children are focused.\n * @returns An observable that emits when the focus state of the element changes.\n * When the element is blurred, null will be emitted.\n */\n monitor(element: ElementRef<HTMLElement>, checkChildren?: boolean): Observable<FocusOrigin>;\n\n monitor(\n element: HTMLElement | ElementRef<HTMLElement>,\n checkChildren: boolean = false,\n ): Observable<FocusOrigin> {\n const nativeElement = coerceElement(element);\n\n // Do nothing if we're not on the browser platform or the passed in node isn't an element.\n if (!this._platform.isBrowser || nativeElement.nodeType !== 1) {\n // 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<FocusOrigin>(),\n rootNode,\n };\n this._elementInfo.set(nativeElement, info);\n this._registerGlobalListeners(info);\n\n return info.subject;\n }\n\n /**\n * Stops monitoring an element and removes all focus classes.\n * @param element The element to stop monitoring.\n */\n stopMonitoring(element: HTMLElement): void;\n\n /**\n * Stops monitoring an element and removes all focus classes.\n * @param element The element to stop monitoring.\n */\n stopMonitoring(element: ElementRef<HTMLElement>): void;\n\n stopMonitoring(element: HTMLElement | ElementRef<HTMLElement>): void {\n const nativeElement = coerceElement(element);\n const elementInfo = this._elementInfo.get(nativeElement);\n\n if (elementInfo) {\n elementInfo.subject.complete();\n\n this._setClasses(nativeElement);\n this._elementInfo.delete(nativeElement);\n this._removeGlobalListeners(elementInfo);\n }\n }\n\n /**\n * Focuses the element via the specified focus origin.\n * @param element Element to focus.\n * @param origin Focus origin.\n * @param options Options that can be used to configure the focus behavior.\n */\n focusVia(element: HTMLElement, origin: FocusOrigin, options?: FocusOptions): void;\n\n /**\n * Focuses the element via the specified focus origin.\n * @param element Element to focus.\n * @param origin Focus origin.\n * @param options Options that can be used to configure the focus behavior.\n */\n focusVia(element: ElementRef<HTMLElement>, origin: FocusOrigin, options?: FocusOptions): void;\n\n focusVia(\n element: HTMLElement | ElementRef<HTMLElement>,\n origin: FocusOrigin,\n options?: FocusOptions,\n ): void {\n const nativeElement = coerceElement(element);\n const focusedElement = this._getDocument().activeElement;\n\n // If the element is focused already, calling `focus` again won't trigger the event listener\n // which means that the focus classes won't be updated. If that's the case, update the classes\n // directly without waiting for an event.\n if (nativeElement === focusedElement) {\n this._getClosestElementsInfo(nativeElement).forEach(([currentElement, info]) =>\n this._originChanged(currentElement, origin, info),\n );\n } else {\n this._setOrigin(origin);\n\n // `focus` isn't available on the server\n if (typeof nativeElement.focus === 'function') {\n nativeElement.focus(options);\n }\n }\n }\n\n ngOnDestroy() {\n this._elementInfo.forEach((_info, element) => this.stopMonitoring(element));\n }\n\n /** Access injected document if available or fallback to global document reference */\n private _getDocument(): Document {\n return this._document || document;\n }\n\n /** Use defaultView of injected document if available or fallback to global window reference */\n private _getWindow(): Window {\n const doc = this._getDocument();\n return doc.defaultView || window;\n }\n\n private _getFocusOrigin(focusEventTarget: HTMLElement | null): FocusOrigin {\n if (this._origin) {\n // If the origin was realized via a touch interaction, we need to perform additional checks\n // to determine whether the focus origin should be attributed to touch or program.\n if (this._originFromTouchInteraction) {\n return this._shouldBeAttributedToTouch(focusEventTarget) ? 'touch' : 'program';\n } else {\n return this._origin;\n }\n }\n\n // If the window has just regained focus, we can restore the most recent origin from before the\n // window blurred. Otherwise, we've reached the point where we can't identify the source of the\n // focus. This typically means one of two things happened:\n //\n // 1) The element was programmatically focused, or\n // 2) The element was focused via screen reader navigation (which generally doesn't fire\n // events).\n //\n // Because we can't distinguish between these two cases, we default to setting `program`.\n if (this._windowFocused && this._lastFocusOrigin) {\n return this._lastFocusOrigin;\n }\n\n // If the interaction is coming from an input label, we consider it a mouse interactions.\n // This is a special case where focus moves on `click`, rather than `mousedown` which breaks\n // our detection, because all our assumptions are for `mousedown`. We need to handle this\n // special case, because it's very common for checkboxes and radio buttons.\n if (focusEventTarget && this._isLastInteractionFromInputLabel(focusEventTarget)) {\n return 'mouse';\n }\n\n return 'program';\n }\n\n /**\n * Returns whether the focus event should be attributed to touch. Recall that in IMMEDIATE mode, a\n * touch origin isn't immediately reset at the next tick (see _setOrigin). This means that when we\n * handle a focus event following a touch interaction, we need to determine whether (1) the focus\n * event was directly caused by the touch interaction or (2) the focus event was caused by a\n * subsequent programmatic focus call triggered by the touch interaction.\n * @param focusEventTarget The target of the focus event under examination.\n */\n private _shouldBeAttributedToTouch(focusEventTarget: HTMLElement | null): boolean {\n // Please note that this check is not perfect. Consider the following edge case:\n //\n // <div #parent tabindex=\"0\">\n // <div #child tabindex=\"0\" (click)=\"#parent.focus()\"></div>\n // </div>\n //\n // Suppose there is a FocusMonitor in IMMEDIATE mode attached to #parent. When the user touches\n // #child, #parent is programmatically focused. This code will attribute the focus to touch\n // instead of program. This is a relatively minor edge-case that can be worked around by using\n // focusVia(parent, 'program') to focus #parent.\n return (\n this._detectionMode === FocusMonitorDetectionMode.EVENTUAL ||\n !!focusEventTarget?.contains(this._inputModalityDetector._mostRecentTarget)\n );\n }\n\n /**\n * Sets the focus classes on the element based on the given focus origin.\n * @param element The element to update the classes on.\n * @param origin The focus origin.\n */\n private _setClasses(element: HTMLElement, origin?: FocusOrigin): void {\n element.classList.toggle('cdk-focused', !!origin);\n element.classList.toggle('cdk-touch-focused', origin === 'touch');\n element.classList.toggle('cdk-keyboard-focused', origin === 'keyboard');\n element.classList.toggle('cdk-mouse-focused', origin === 'mouse');\n element.classList.toggle('cdk-program-focused', origin === 'program');\n }\n\n /**\n * Updates the focus origin. If we're using immediate detection mode, we schedule an async\n * function to clear the origin at the end of a timeout. The duration of the timeout depends on\n * the origin being set.\n * @param origin The origin to set.\n * @param isFromInteraction Whether we are setting the origin from an interaction event.\n */\n private _setOrigin(origin: FocusOrigin, isFromInteraction = false): void {\n this._ngZone.runOutsideAngular(() => {\n this._origin = origin;\n this._originFromTouchInteraction = origin === 'touch' && isFromInteraction;\n\n // If we're in IMMEDIATE mode, reset the origin at the next tick (or in `TOUCH_BUFFER_MS` ms\n // for a touch event). We reset the origin at the next tick because Firefox focuses one tick\n // after the interaction event. We wait `TOUCH_BUFFER_MS` ms before resetting the origin for\n // a touch event because when a touch event is fired, the associated focus event isn't yet in\n // the event queue. Before doing so, clear any pending timeouts.\n if (this._detectionMode === FocusMonitorDetectionMode.IMMEDIATE) {\n clearTimeout(this._originTimeoutId);\n const ms = this._originFromTouchInteraction ? TOUCH_BUFFER_MS : 1;\n this._originTimeoutId = setTimeout(() => (this._origin = null), ms);\n }\n });\n }\n\n /**\n * Handles focus events on a registered element.\n * @param event The focus event.\n * @param element The monitored element.\n */\n private _onFocus(event: FocusEvent, element: HTMLElement) {\n // NOTE(mmalerba): We currently set the classes based on the focus origin of the most recent\n // focus event affecting the monitored element. If we want to use the origin of the first event\n // instead we should check for the cdk-focused class here and return if the element already has\n // it. (This only matters for elements that have includesChildren = true).\n\n // If we are not counting child-element-focus as focused, make sure that the event target is the\n // monitored element itself.\n const elementInfo = this._elementInfo.get(element);\n const focusEventTarget = _getEventTarget<HTMLElement>(event);\n if (!elementInfo || (!elementInfo.checkChildren && element !== focusEventTarget)) {\n return;\n }\n\n this._originChanged(element, this._getFocusOrigin(focusEventTarget), elementInfo);\n }\n\n /**\n * Handles blur events on a registered element.\n * @param event The blur event.\n * @param element The monitored element.\n */\n _onBlur(event: FocusEvent, element: HTMLElement) {\n // If we are counting child-element-focus as focused, make sure that we aren't just blurring in\n // order to focus another child of the monitored element.\n const elementInfo = this._elementInfo.get(element);\n\n if (\n !elementInfo ||\n (elementInfo.checkChildren &&\n event.relatedTarget instanceof Node &&\n element.contains(event.relatedTarget))\n ) {\n return;\n }\n\n this._setClasses(element);\n this._emitOrigin(elementInfo, null);\n }\n\n private _emitOrigin(info: MonitoredElementInfo, origin: FocusOrigin) {\n if (info.subject.observers.length) {\n this._ngZone.run(() => info.subject.next(origin));\n }\n }\n\n private _registerGlobalListeners(elementInfo: MonitoredElementInfo) {\n if (!this._platform.isBrowser) {\n return;\n }\n\n const rootNode = elementInfo.rootNode;\n const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode) || 0;\n\n if (!rootNodeFocusListeners) {\n this._ngZone.runOutsideAngular(() => {\n rootNode.addEventListener(\n 'focus',\n this._rootNodeFocusAndBlurListener,\n captureEventListenerOptions,\n );\n rootNode.addEventListener(\n 'blur',\n this._rootNodeFocusAndBlurListener,\n captureEventListenerOptions,\n );\n });\n }\n\n this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners + 1);\n\n // Register global listeners when first element is monitored.\n if (++this._monitoredElementCount === 1) {\n // Note: we listen to events in the capture phase so we\n // can detect them even if the user stops propagation.\n this._ngZone.runOutsideAngular(() => {\n const window = this._getWindow();\n window.addEventListener('focus', this._windowFocusListener);\n });\n\n // The InputModalityDetector is also just a collection of global listeners.\n this._inputModalityDetector.modalityDetected\n .pipe(takeUntil(this._stopInputModalityDetector))\n .subscribe(modality => {\n this._setOrigin(modality, true /* isFromInteraction */);\n });\n }\n }\n\n private _removeGlobalListeners(elementInfo: MonitoredElementInfo) {\n const rootNode = elementInfo.rootNode;\n\n if (this._rootNodeFocusListenerCount.has(rootNode)) {\n const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode)!;\n\n if (rootNodeFocusListeners > 1) {\n this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners - 1);\n } else {\n rootNode.removeEventListener(\n 'focus',\n this._rootNodeFocusAndBlurListener,\n captureEventListenerOptions,\n );\n rootNode.removeEventListener(\n 'blur',\n this._rootNodeFocusAndBlurListener,\n captureEventListenerOptions,\n );\n this._rootNodeFocusListenerCount.delete(rootNode);\n }\n }\n\n // Unregister global listeners when last element is unmonitored.\n if (!--this._monitoredElementCount) {\n const window = this._getWindow();\n window.removeEventListener('focus', this._windowFocusListener);\n\n // Equivalently, stop our InputModalityDetector subscription.\n this._stopInputModalityDetector.next();\n\n // Clear timeouts for all potentially pending timeouts to prevent the leaks.\n clearTimeout(this._windowFocusTimeoutId);\n clearTimeout(this._originTimeoutId);\n }\n }\n\n /** Updates all the state on an element once its focus origin has changed. */\n private _originChanged(\n element: HTMLElement,\n origin: FocusOrigin,\n elementInfo: MonitoredElementInfo,\n ) {\n this._setClasses(element, origin);\n this._emitOrigin(elementInfo, origin);\n this._lastFocusOrigin = origin;\n }\n\n /**\n * Collects the `MonitoredElementInfo` of a particular element and\n * all of its ancestors that have enabled `checkChildren`.\n * @param element Element from which to start the search.\n */\n private _getClosestElementsInfo(element: HTMLElement): [HTMLElement, MonitoredElementInfo][] {\n const results: [HTMLElement, MonitoredElementInfo][] = [];\n\n this._elementInfo.forEach((info, currentElement) => {\n if (currentElement === element || (info.checkChildren && currentElement.contains(element))) {\n results.push([currentElement, info]);\n }\n });\n\n return results;\n }\n\n /**\n * Returns whether an interaction is likely to have come from the user clicking the `label` of\n * an `input` or `textarea` in order to focus it.\n * @param focusEventTarget Target currently receiving focus.\n */\n private _isLastInteractionFromInputLabel(focusEventTarget: HTMLElement): boolean {\n const {_mostRecentTarget: mostRecentTarget, mostRecentModality} = this._inputModalityDetector;\n\n // If the last interaction used the mouse on an element contained by one of the labels\n // of an `input`/`textarea` that is currently focused, it is very likely that the\n // user redirected focus using the label.\n if (\n mostRecentModality !== 'mouse' ||\n !mostRecentTarget ||\n mostRecentTarget === focusEventTarget ||\n (focusEventTarget.nodeName !== 'INPUT' && focusEventTarget.nodeName !== 'TEXTAREA') ||\n (focusEventTarget as HTMLInputElement | HTMLTextAreaElement).disabled\n ) {\n return false;\n }\n\n const labels = (focusEventTarget as HTMLInputElement | HTMLTextAreaElement).labels;\n\n if (labels) {\n for (let i = 0; i < labels.length; i++) {\n if (labels[i].contains(mostRecentTarget)) {\n return true;\n }\n }\n }\n\n return false;\n }\n}\n\n/**\n * Directive that determines how a particular element was focused (via keyboard, mouse, touch, or\n * programmatically) and adds corresponding classes to the element.\n *\n * There are two variants of this directive:\n * 1) cdkMonitorElementFocus: does not consider an element to be focused if one of its children is\n * focused.\n * 2) cdkMonitorSubtreeFocus: considers an element focused if it or any of its children are focused.\n */\n@Directive({\n selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',\n exportAs: 'cdkMonitorFocus',\n})\nexport class CdkMonitorFocus implements AfterViewInit, OnDestroy {\n private _monitorSubscription: Subscription;\n private _focusOrigin: FocusOrigin = null;\n\n @Output() readonly cdkFocusChange = new EventEmitter<FocusOrigin>();\n\n constructor(private _elementRef: ElementRef<HTMLElement>, private _focusMonitor: FocusMonitor) {}\n\n get focusOrigin(): FocusOrigin {\n return this._focusOrigin;\n }\n\n ngAfterViewInit() {\n const element = this._elementRef.nativeElement;\n this._monitorSubscription = this._focusMonitor\n .monitor(element, element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))\n .subscribe(origin => {\n this._focusOrigin = origin;\n this.cdkFocusChange.emit(origin);\n });\n }\n\n ngOnDestroy() {\n this._focusMonitor.stopMonitoring(this._elementRef);\n\n if (this._monitorSubscription) {\n this._monitorSubscription.unsubscribe();\n }\n }\n}\n","/**\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.io/license\n */\n\nimport {inject, Inject, Injectable, OnDestroy} from '@angular/core';\nimport {BreakpointObserver} from '@angular/cdk/layout';\nimport {Platform} from '@angular/cdk/platform';\nimport {DOCUMENT} from '@angular/common';\nimport {Subscription} from 'rxjs';\n\n/** Set of possible high-contrast mode backgrounds. */\nexport const enum HighContrastMode {\n NONE,\n BLACK_ON_WHITE,\n WHITE_ON_BLACK,\n}\n\n/** CSS class applied to the document body when in black-on-white high-contrast mode. */\nexport const BLACK_ON_WHITE_CSS_CLASS = 'cdk-high-contrast-black-on-white';\n\n/** CSS class applied to the document body when in white-on-black high-contrast mode. */\nexport const WHITE_ON_BLACK_CSS_CLASS = 'cdk-high-contrast-white-on-black';\n\n/** CSS class applied to the document body when in high-contrast mode. */\nexport const HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS = 'cdk-high-contrast-active';\n\n/**\n * Service to determine whether the browser is currently in a high-contrast-mode environment.\n *\n * Microsoft Windows supports an accessibility feature called \"High Contrast Mode\". This mode\n * changes the appearance of all applications, including web applications, to dramatically increase\n * contrast.\n *\n * IE, Edge, and Firefox currently support this mode. Chrome does not support Windows High Contrast\n * Mode. This service does not detect high-contrast mode as added by the Chrome \"High Contrast\"\n * browser extension.\n */\n@Injectable({providedIn: 'root'})\nexport class HighContrastModeDetector implements OnDestroy {\n /**\n * Figuring out the high contrast mode and adding the body classes can cause\n * some expensive layouts. This flag is used to ensure that we only do it once.\n */\n private _hasCheckedHighContrastMode: boolean;\n private _document: Document;\n private _breakpointSubscription: Subscription;\n\n constructor(private _platform: Platform, @Inject(DOCUMENT) document: any) {\n this._document = document;\n\n this._breakpointSubscription = inject(BreakpointObserver)\n .observe('(forced-colors: active)')\n .subscribe(() => {\n if (this._hasCheckedHighContrastMode) {\n this._hasCheckedHighContrastMode = false;\n this._applyBodyHighContrastModeCssClasses();\n }\n });\n }\n\n /** Gets the current high-contrast-mode for the page. */\n getHighContrastMode(): HighContrastMode {\n if (!this._platform.isBrowser) {\n return HighContrastMode.NONE;\n }\n\n // Create a test element with an arbitrary background-color that is neither black nor\n // white; high-contrast mode will coerce the color to either black or white. Also ensure that\n // appending the test element to the DOM does not affect layout by absolutely positioning it\n const testElement = this._document.createElement('div');\n testElement.style.backgroundColor = 'rgb(1,2,3)';\n testElement.style.position = 'absolute';\n this._document.body.appendChild(testElement);\n\n // Get the computed style for the background color, collapsing spaces to normalize between\n // browsers. Once we get this color, we no longer need the test element. Access the `window`\n // via the document so we can fake it in tests. 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