source: trip-planner-front/node_modules/@angular/cdk/fesm2015/a11y.js.map@ 6fe77af

{"version":3,"file":"a11y.js","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/configurable-focus-trap-config.ts","../../../../../../src/cdk/a11y/focus-trap/focus-trap-inert-strategy.ts","../../../../../../src/cdk/a11y/focus-trap/polyfill.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/public-api.ts","../../../../../../src/cdk/a11y/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: string, id: string) {\n  const ids = getAriaReferenceIds(el, attr);\n  if (ids.some(existingId => existingId.trim() == id.trim())) { return; }\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: 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} from '@angular/core';\nimport {addAriaReferencedId, getAriaReferenceIds, removeAriaReferencedId} from './aria-reference';\n\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/** ID used for the body container where all messages are appended. */\nexport const MESSAGES_CONTAINER_ID = 'cdk-describedby-message-container';\n\n/** ID prefix used for each created message element. */\nexport const CDK_DESCRIBEDBY_ID_PREFIX = 'cdk-describedby-message';\n\n/** Attribute given to each host element that is described by a message element. */\nexport const CDK_DESCRIBEDBY_HOST_ATTRIBUTE = 'cdk-describedby-host';\n\n/** Global incremental identifier for each registered message element. */\nlet nextId = 0;\n\n/** Global map of all registered message elements that have been placed into the document. */\nconst messageRegistry = new Map<string|Element, RegisteredMessage>();\n\n/** Container for all registered messages. */\nlet messagesContainer: HTMLElement | null = null;\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  constructor(\n    @Inject(DOCUMENT) _document: any) {\n    this._document = _document;\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);\n      messageRegistry.set(key, {messageElement: message, referenceCount: 0});\n    } else if (!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 = messageRegistry.get(key);\n      if (registeredMessage && registeredMessage.referenceCount === 0) {\n        this._deleteMessageElement(key);\n      }\n    }\n\n    if (messagesContainer && messagesContainer.childNodes.length === 0) {\n      this._deleteMessagesContainer();\n    }\n  }\n\n  /** Unregisters all created message elements and removes the message container. */\n  ngOnDestroy() {\n    const describedElements =\n        this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}]`);\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    if (messagesContainer) {\n      this._deleteMessagesContainer();\n    }\n\n    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);\n    messageElement.textContent = message;\n\n    if (role) {\n      messageElement.setAttribute('role', role);\n    }\n\n    this._createMessagesContainer();\n    messagesContainer!.appendChild(messageElement);\n    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    const registeredMessage = messageRegistry.get(key);\n    const messageElement = registeredMessage && registeredMessage.messageElement;\n    if (messagesContainer && messageElement) {\n      messagesContainer.removeChild(messageElement);\n    }\n    messageRegistry.delete(key);\n  }\n\n  /** Creates the global container for all aria-describedby messages. */\n  private _createMessagesContainer() {\n    if (!messagesContainer) {\n      const preExistingContainer = this._document.getElementById(MESSAGES_CONTAINER_ID);\n\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      if (preExistingContainer && preExistingContainer.parentNode) {\n        preExistingContainer.parentNode.removeChild(preExistingContainer);\n      }\n\n      messagesContainer = this._document.createElement('div');\n      messagesContainer.id = MESSAGES_CONTAINER_ID;\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('cdk-visually-hidden');\n\n      this._document.body.appendChild(messagesContainer);\n    }\n  }\n\n  /** Deletes the global messages container. */\n  private _deleteMessagesContainer() {\n    if (messagesContainer && messagesContainer.parentNode) {\n      messagesContainer.parentNode.removeChild(messagesContainer);\n      messagesContainer = null;\n    }\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')\n        .filter(id => id.indexOf(CDK_DESCRIBEDBY_ID_PREFIX) != 0);\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 = 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, '');\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 = 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 = 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) {\n  if (!element.id) {\n    element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${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} 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 _vertical = true;\n  private _horizontal: 'ltr' | 'rtl' | null;\n  private _allowedModifierKeys: ListKeyManagerModifierKey[] = [];\n  private _homeAndEnd = false;\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      _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 ((typeof ngDevMode === 'undefined' || ngDevMode) && (this._items.length &&\n        this._items.some(item => typeof item.getLabel !== 'function'))) {\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.pipe(\n      tap(letter => this._pressedLetters.push(letter)),\n      debounceTime(debounceInterval),\n      filter(() => this._pressedLetters.length > 0),\n      map(() => this._pressedLetters.join(''))\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 (!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  /**\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   * 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      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 ? 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  /**\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  /**\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","/**\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 is is focusable or\n * tabbable.\n */\n@Injectable({providedIn: 'root'})\nexport class InteractivityChecker {\n\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 isPotentiallyFocusable(element) && !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 !!(element.offsetWidth || element.offsetHeight ||\n      (typeof element.getClientRects === 'function' && element.getClientRects().length));\n}\n\n/** Gets whether an element's  */\nfunction isNativeFormElement(element: Node) {\n  let nodeName = element.nodeName.toLowerCase();\n  return nodeName === 'input' ||\n      nodeName === 'select' ||\n      nodeName === 'button' ||\n      nodeName === 'textarea';\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\n  // IE11 parses tabindex=\"\" as the value \"-32768\"\n  if (tabIndex == '-32768') {\n    return false;\n  }\n\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 inputType === 'text'\n      || inputType === 'password'\n      || nodeName === 'select'\n      || nodeName === 'textarea';\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 isNativeFormElement(element) ||\n      isAnchorWithHref(element) ||\n      element.hasAttribute('contenteditable') ||\n      hasValidTabIndex(element);\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/**\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 { return this._enabled; }\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\n      if (startAnchor.parentNode) {\n        startAnchor.parentNode.removeChild(startAnchor);\n      }\n    }\n\n    if (endAnchor) {\n      endAnchor.removeEventListener('focus', this.endAnchorListener);\n\n      if (endAnchor.parentNode) {\n        endAnchor.parentNode.removeChild(endAnchor);\n      }\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 either focuses the first element that the\n   * user specified, or 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    let markers = this._element.querySelectorAll(`[cdk-focus-region-${bound}], ` +\n                                                 `[cdkFocusRegion${bound}], ` +\n                                                 `[cdk-focus-${bound}]`) as NodeListOf<HTMLElement>;\n\n    for (let i = 0; i < markers.length; i++) {\n      // @breaking-change 8.0.0\n      if (markers[i].hasAttribute(`cdk-focus-${bound}`)) {\n        console.warn(`Found use of deprecated attribute 'cdk-focus-${bound}', ` +\n                     `use 'cdkFocusRegion${bound}' instead. The deprecated ` +\n                     `attribute will be removed in 8.0.0.`, markers[i]);\n      } else if (markers[i].hasAttribute(`cdk-focus-region-${bound}`)) {\n        console.warn(`Found use of deprecated attribute 'cdk-focus-region-${bound}', ` +\n                     `use 'cdkFocusRegion${bound}' instead. The deprecated attribute ` +\n                     `will be removed in 8.0.0.`, markers[i]);\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] : 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(`[cdk-focus-initial], ` +\n                                                          `[cdkFocusInitial]`) as HTMLElement;\n\n    if (redirectToElement) {\n      // @breaking-change 8.0.0\n      if (redirectToElement.hasAttribute(`cdk-focus-initial`)) {\n        console.warn(`Found use of deprecated attribute 'cdk-focus-initial', ` +\n                    `use 'cdkFocusInitial' instead. The deprecated attribute ` +\n                    `will be removed in 8.0.0`, redirectToElement);\n      }\n\n      // Warn the consumer if the element they've pointed to\n      // isn't focusable, when not in production mode.\n      if ((typeof ngDevMode === 'undefined' || ngDevMode) &&\n        !this._checker.isFocusable(redirectToElement)) {\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    // Iterate in DOM order. Note that IE doesn't have `children` for SVG so we fall\n    // back to `childNodes` which includes text nodes, comments etc.\n    let children = root.children || root.childNodes;\n\n    for (let i = 0; i < children.length; i++) {\n      let tabbableChild = 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    let children = root.children || root.childNodes;\n\n    for (let i = children.length - 1; i >= 0; i--) {\n      let tabbableChild = 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, this._checker, this._ngZone, this._document, deferCaptureElements);\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 { return this.focusTrap.enabled; }\n  set enabled(value: boolean) { this.focusTrap.enabled = coerceBooleanProperty(value); }\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 { return this._autoCapture; }\n  set autoCapture(value: boolean) { this._autoCapture = coerceBooleanProperty(value); }\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    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 (autoCaptureChange && !autoCaptureChange.firstChange && this.autoCapture &&\n        this.focusTrap.hasAttached()) {\n      this._captureFocus();\n    }\n  }\n\n  private _captureFocus() {\n    this._previouslyFocusedElement = _getFocusedElementPierceShadowDom();\n    this.focusTrap.focusInitialElementWhenReady();\n  }\n\n  static ngAcceptInputType_enabled: BooleanInput;\n  static ngAcceptInputType_autoCapture: BooleanInput;\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 { return this._enabled; }\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    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 */\n\n/**\n * Options for creating a ConfigurableFocusTrap.\n */\nexport interface ConfigurableFocusTrapConfig {\n  /**\n   * Whether to defer the creation of FocusTrap elements to be done manually by the user.\n   */\n  defer: boolean;\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 {\n  InjectionToken,\n} 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 =\n  new InjectionToken<FocusTrapInertStrategy>('FOCUS_TRAP_INERT_STRATEGY');\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\n/** IE 11 compatible closest implementation that is able to start from non-Element Nodes. */\nexport function closest(element: EventTarget|Element|null|undefined, selector: string):\n    Element|null {\n  if (!(element instanceof Node)) { return null; }\n\n  let curr: Node|null = element;\n  while (curr != null && !(curr instanceof Element)) {\n    curr = curr.parentNode;\n  }\n\n  return curr && (hasNativeClosest ?\n      curr.closest(selector) : polyfillClosest(curr, selector)) as Element|null;\n}\n\n/** Polyfill for browsers without Element.closest. */\nfunction polyfillClosest(element: Element, selector: string): Element|null {\n  let curr: Node|null = element;\n  while (curr != null && !(curr instanceof Element && matches(curr, selector))) {\n    curr = curr.parentNode;\n  }\n\n  return (curr || null) as Element|null;\n}\n\nconst hasNativeClosest = typeof Element != 'undefined' && !!Element.prototype.closest;\n\n/** IE 11 compatible matches implementation. */\nfunction matches(element: Element, selector: string): boolean {\n  return element.matches ?\n      element.matches(selector) :\n      (element as any)['msMatchesSelector'](selector);\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';\nimport {closest} from './polyfill';\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 (!focusTrapRoot.contains(target) && closest(target, 'div.cdk-overlay-pane') === null) {\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 {\n  Inject,\n  Injectable,\n  Optional,\n  NgZone,\n} 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(element: HTMLElement, 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, this._checker, this._ngZone, this._document, this._focusTrapManager,\n        this._inertStrategy, configObject);\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 both `offsetX` and `offsetY` are\n  // zero. Note that there's an edge case where the user could click the 0x0 spot of the screen\n  // themselves, but that is unlikely to contain interaction elements. Historially we used to check\n  // `event.buttons === 0`, however that no longer works on recent versions of NVDA.\n  return event.offsetX === 0 && event.offsetY === 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 = (event.touches && event.touches[0]) ||\n                                   (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 !!touch && touch.identifier === -1 && (touch.radiusX == null || touch.radiusX === 1) &&\n         (touch.radiusY == null || touch.radiusY === 1);\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 =\n  new InjectionToken<InputModalityDetectorOptions>('cdk-input-modality-detector-options');\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)) { return; }\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) { return; }\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() @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 =\n    new InjectionToken<HTMLElement | null>('liveAnnouncerElement', {\n      providedIn: 'root',\n      factory: LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY,\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 =\n    new InjectionToken<LiveAnnouncerDefaultOptions>('LIVE_ANNOUNCER_DEFAULT_OPTIONS');\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\n\n@Injectable({providedIn: 'root'})\nexport class LiveAnnouncer implements OnDestroy {\n  private _liveElement: HTMLElement;\n  private _document: Document;\n  private _previousTimeout: number;\n\n  constructor(\n      @Optional() @Inject(LIVE_ANNOUNCER_ELEMENT_TOKEN) elementToken: any,\n      private _ngZone: NgZone,\n      @Inject(DOCUMENT) _document: any,\n      @Optional() @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 screenreaders.\n   * @param message Message to be announced to the screenreader.\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 screenreaders.\n   * @param message Message to be announced to the screenreader.\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 screenreaders.\n   * @param message Message to be announced to the screenreader.\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 screenreaders.\n   * @param message Message to be announced to the screenreader.\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    // 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      return new Promise(resolve => {\n        clearTimeout(this._previousTimeout);\n        this._previousTimeout = setTimeout(() => {\n          this._liveElement.textContent = message;\n          resolve();\n\n          if (typeof duration === 'number') {\n            this._previousTimeout = setTimeout(() => this.clear(), duration);\n          }\n        }, 100);\n      });\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\n    if (this._liveElement && this._liveElement.parentNode) {\n      this._liveElement.parentNode.removeChild(this._liveElement);\n      this._liveElement = null!;\n    }\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].parentNode!.removeChild(previousElements[i]);\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\n    this._document.body.appendChild(liveEl);\n\n    return liveEl;\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 { return this._politeness; }\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\n          .observe(this._elementRef)\n          .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);\n              this._previousAnnouncedText = elementText;\n            }\n          });\n      });\n    }\n  }\n  private _politeness: AriaLivePoliteness = 'polite';\n\n  private _previousAnnouncedText?: string;\n  private _subscription: Subscription | null;\n\n  constructor(private _elementRef: ElementRef, private _liveAnnouncer: LiveAnnouncer,\n              private _contentObserver: ContentObserver, private _ngZone: NgZone) {}\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 {\n  InputModalityDetector,\n  TOUCH_BUFFER_MS,\n} from '../input-modality/input-modality-detector';\n\n\nexport type FocusOrigin = 'touch' | 'mouse' | 'keyboard' | 'program' | null;\n\n/**\n * Corresponds to the options that can be passed to the native `focus` event.\n * via https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/focus\n */\nexport interface FocusOptions {\n  /** Whether the browser should scroll to the element when it is focused. */\n  preventScroll?: boolean;\n}\n\n/** Detection mode used for attributing the origin of a focus event. */\nexport const enum FocusMonitorDetectionMode {\n  /**\n   * Any mousedown, keydown, or touchstart event that happened in the previous\n   * tick or the current tick will be used to assign a focus event's origin (to\n   * either mouse, keyboard, or touch). This is the default option.\n   */\n  IMMEDIATE,\n  /**\n   * A focus event's origin is always attributed to the last corresponding\n   * mousedown, keydown, or touchstart event, no matter how long ago it 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 =\n    new InjectionToken<FocusMonitorOptions>('cdk-focus-monitor-default-options');\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\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 = 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:\n          FocusMonitorOptions|null) {\n    this._document = document;\n    this._detectionMode = options?.detectionMode || FocusMonitorDetectionMode.IMMEDIATE;\n  }\n  /**\n   * Event listener for `focus` and 'blur' events on the document.\n   * Needs to be an arrow function in order to preserve the context when it gets bound.\n   */\n  private _rootNodeFocusAndBlurListener = (event: Event) => {\n    const target = _getEventTarget<HTMLElement>(event);\n    const handler = event.type === 'focus' ? this._onFocus : this._onBlur;\n\n    // We need to walk up the ancestor chain in order to support `checkChildren`.\n    for (let element = target; element; element = element.parentElement) {\n      handler.call(this, event as FocusEvent, element);\n    }\n  }\n\n  /**\n   * Monitors focus on an element and applies appropriate CSS classes.\n   * @param element The element to monitor\n   * @param checkChildren Whether to count the element as focused when its children are focused.\n   * @returns An observable that emits when the focus state of the element changes.\n   *     When the element is blurred, null will be emitted.\n   */\n  monitor(element: HTMLElement, checkChildren?: boolean): Observable<FocusOrigin>;\n\n  /**\n   * Monitors focus on an element and applies appropriate CSS classes.\n   * @param element The element to monitor\n   * @param checkChildren Whether to count the element as focused when its children are focused.\n   * @returns An observable that emits when the focus state of the element changes.\n   *     When the element is blurred, null will be emitted.\n   */\n  monitor(element: ElementRef<HTMLElement>, checkChildren?: boolean): Observable<FocusOrigin>;\n\n  monitor(element: HTMLElement | ElementRef<HTMLElement>,\n          checkChildren: boolean = false): Observable<FocusOrigin> {\n    const nativeElement = coerceElement(element);\n\n    // Do nothing if we're not on the browser platform or the passed in node isn't an element.\n    if (!this._platform.isBrowser || nativeElement.nodeType !== 1) {\n      return observableOf(null);\n    }\n\n    // If the element is inside the shadow DOM, we need to bind our focus/blur listeners to\n    // the shadow root, rather than the `document`, because the browser won't emit focus events\n    // to the `document`, if focus is moving within the same shadow root.\n    const rootNode = _getShadowRoot(nativeElement) || this._getDocument();\n    const cachedInfo = this._elementInfo.get(nativeElement);\n\n    // Check if we're already monitoring this element.\n    if (cachedInfo) {\n      if (checkChildren) {\n        // TODO(COMP-318): this can be problematic, because it'll turn all non-checkChildren\n        // observers into ones that behave as if `checkChildren` was turned on. We need a more\n        // robust solution.\n        cachedInfo.checkChildren = true;\n      }\n\n      return cachedInfo.subject;\n    }\n\n    // Create monitored element info.\n    const info: MonitoredElementInfo = {\n      checkChildren: checkChildren,\n      subject: new Subject<FocusOrigin>(),\n      rootNode\n    };\n    this._elementInfo.set(nativeElement, info);\n    this._registerGlobalListeners(info);\n\n    return info.subject;\n  }\n\n  /**\n   * Stops monitoring an element and removes all focus classes.\n   * @param element The element to stop monitoring.\n   */\n  stopMonitoring(element: HTMLElement): void;\n\n  /**\n   * Stops monitoring an element and removes all focus classes.\n   * @param element The element to stop monitoring.\n   */\n  stopMonitoring(element: ElementRef<HTMLElement>): void;\n\n  stopMonitoring(element: HTMLElement | ElementRef<HTMLElement>): void {\n    const nativeElement = coerceElement(element);\n    const elementInfo = this._elementInfo.get(nativeElement);\n\n    if (elementInfo) {\n      elementInfo.subject.complete();\n\n      this._setClasses(nativeElement);\n      this._elementInfo.delete(nativeElement);\n      this._removeGlobalListeners(elementInfo);\n    }\n  }\n\n  /**\n   * Focuses the element via the specified focus origin.\n   * @param element Element to focus.\n   * @param origin Focus origin.\n   * @param options Options that can be used to configure the focus behavior.\n   */\n  focusVia(element: HTMLElement, origin: FocusOrigin, options?: FocusOptions): void;\n\n  /**\n   * Focuses the element via the specified focus origin.\n   * @param element Element to focus.\n   * @param origin Focus origin.\n   * @param options Options that can be used to configure the focus behavior.\n   */\n  focusVia(element: ElementRef<HTMLElement>, origin: FocusOrigin, options?: FocusOptions): void;\n\n  focusVia(element: HTMLElement | ElementRef<HTMLElement>,\n          origin: FocusOrigin,\n          options?: FocusOptions): void {\n\n    const nativeElement = coerceElement(element);\n    const focusedElement = this._getDocument().activeElement;\n\n    // If the element is focused already, calling `focus` again won't trigger the event listener\n    // which means that the focus classes won't be updated. If that's the case, update the classes\n    // directly without waiting for an event.\n    if (nativeElement === focusedElement) {\n      this._getClosestElementsInfo(nativeElement)\n        .forEach(([currentElement, info]) => this._originChanged(currentElement, origin, info));\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 _toggleClass(element: Element, className: string, shouldSet: boolean) {\n    if (shouldSet) {\n      element.classList.add(className);\n    } else {\n      element.classList.remove(className);\n    }\n  }\n\n  private _getFocusOrigin(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    return (this._windowFocused && this._lastFocusOrigin) ? this._lastFocusOrigin : '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 (this._detectionMode === FocusMonitorDetectionMode.EVENTUAL) ||\n        !!focusEventTarget?.contains(this._inputModalityDetector._mostRecentTarget);\n  }\n\n  /**\n   * Sets the focus classes on the element based on the given focus origin.\n   * @param element The element to update the classes on.\n   * @param origin The focus origin.\n   */\n  private _setClasses(element: HTMLElement, origin?: FocusOrigin): void {\n    this._toggleClass(element, 'cdk-focused', !!origin);\n    this._toggleClass(element, 'cdk-touch-focused', origin === 'touch');\n    this._toggleClass(element, 'cdk-keyboard-focused', origin === 'keyboard');\n    this._toggleClass(element, 'cdk-mouse-focused', origin === 'mouse');\n    this._toggleClass(element, 'cdk-program-focused', origin === 'program');\n  }\n\n  /**\n   * 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 (!elementInfo || (elementInfo.checkChildren && event.relatedTarget instanceof Node &&\n        element.contains(event.relatedTarget))) {\n      return;\n    }\n\n    this._setClasses(element);\n    this._emitOrigin(elementInfo.subject, null);\n  }\n\n  private _emitOrigin(subject: Subject<FocusOrigin>, origin: FocusOrigin) {\n    this._ngZone.run(() => subject.next(origin));\n  }\n\n  private _registerGlobalListeners(elementInfo: MonitoredElementInfo) {\n    if (!this._platform.isBrowser) {\n      return;\n    }\n\n    const rootNode = elementInfo.rootNode;\n    const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode) || 0;\n\n    if (!rootNodeFocusListeners) {\n      this._ngZone.runOutsideAngular(() => {\n        rootNode.addEventListener('focus', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n        rootNode.addEventListener('blur', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n      });\n    }\n\n    this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners + 1);\n\n    // Register global listeners when first element is monitored.\n    if (++this._monitoredElementCount === 1) {\n      // Note: we listen to events in the capture phase so we\n      // can detect them even if the user stops propagation.\n      this._ngZone.runOutsideAngular(() => {\n        const 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 => { this._setOrigin(modality, true /* isFromInteraction */); });\n    }\n  }\n\n  private _removeGlobalListeners(elementInfo: MonitoredElementInfo) {\n    const rootNode = elementInfo.rootNode;\n\n    if (this._rootNodeFocusListenerCount.has(rootNode)) {\n      const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode)!;\n\n      if (rootNodeFocusListeners > 1) {\n        this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners - 1);\n      } else {\n        rootNode.removeEventListener('focus', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n        rootNode.removeEventListener('blur', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n        this._rootNodeFocusListenerCount.delete(rootNode);\n      }\n    }\n\n    // Unregister global listeners when last element is unmonitored.\n    if (!--this._monitoredElementCount) {\n      const 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(element: HTMLElement, origin: FocusOrigin,\n                         elementInfo: MonitoredElementInfo) {\n    this._setClasses(element, origin);\n    this._emitOrigin(elementInfo.subject, origin);\n    this._lastFocusOrigin = origin;\n  }\n\n  /**\n   * 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/**\n * Directive that determines how a particular element was focused (via keyboard, mouse, touch, or\n * programmatically) and adds corresponding classes to the element.\n *\n * There are two variants of this directive:\n * 1) cdkMonitorElementFocus: does not consider an element to be focused if one of its children is\n *    focused.\n * 2) cdkMonitorSubtreeFocus: considers an element focused if it or any of its children are focused.\n */\n@Directive({\n  selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',\n})\nexport class CdkMonitorFocus implements AfterViewInit, OnDestroy {\n  private _monitorSubscription: Subscription;\n  @Output() readonly cdkFocusChange = new EventEmitter<FocusOrigin>();\n\n  constructor(private _elementRef: ElementRef<HTMLElement>, private _focusMonitor: FocusMonitor) {}\n\n  ngAfterViewInit() {\n    const element = this._elementRef.nativeElement;\n    this._monitorSubscription = this._focusMonitor.monitor(\n      element,\n      element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))\n    .subscribe(origin => this.cdkFocusChange.emit(origin));\n  }\n\n  ngOnDestroy() {\n    this._focusMonitor.stopMonitoring(this._elementRef);\n\n    if (this._monitorSubscription) {\n      this._monitorSubscription.unsubscribe();\n    }\n  }\n}\n","/**\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 {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable} from '@angular/core';\n\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 {\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\n  constructor(private _platform: Platform, @Inject(DOCUMENT) document: any) {\n    this._document = document;\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. Note that we have extra null checks, because\n    // this logic will likely run during app bootstrap and throwing can break the entire app.\n    const documentWindow = this._document.defaultView || window;\n    const computedStyle = (documentWindow && documentWindow.getComputedStyle) ?\n        documentWindow.getComputedStyle(testElement) : null;\n    const computedColor =\n        (computedStyle && computedStyle.backgroundColor || '').replace(/ /g, '');\n    this._document.body.removeChild(testElement);\n\n    switch (computedColor) {\n      case 'rgb(0,0,0)': return HighContrastMode.WHITE_ON_BLACK;\n      case 'rgb(255,255,255)': return HighContrastMode.BLACK_ON_WHITE;\n    }\n    return HighContrastMode.NONE;\n  }\n\n  /** Applies CSS classes indicating high-contrast mode to document body (browser-only). */\n  _applyBodyHighContrastModeCssClasses(): void {\n    if (!this._hasCheckedHighContrastMode && this._platform.isBrowser && this._document.body) {\n      const bodyClasses = this._document.body.classList;\n      // IE11 doesn't support `classList` operations with multiple arguments\n      bodyClasses.remove(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);\n      bodyClasses.remove(BLACK_ON_WHITE_CSS_CLASS);\n      bodyClasses.remove(WHITE_ON_BLACK_CSS_CLASS);\n      this._hasCheckedHighContrastMode = true;\n\n      const mode = this.getHighContrastMode();\n      if (mode === HighContrastMode.BLACK_ON_WHITE) {\n        bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);\n        bodyClasses.add(BLACK_ON_WHITE_CSS_CLASS);\n      } else if (mode === HighContrastMode.WHITE_ON_BLACK) {\n        bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);\n        bodyClasses.add(WHITE_ON_BLACK_CSS_CLASS);\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 {ObserversModule} from '@angular/cdk/observers';\nimport {PlatformModule} from '@angular/cdk/platform';\nimport {NgModule} from '@angular/core';\nimport {CdkMonitorFocus} from './focus-monitor/focus-monitor';\nimport {CdkTrapFocus} from './focus-trap/focus-trap';\nimport {HighContrastModeDetector} from './high-contrast-mode/high-contrast-mode-detector';\nimport {CdkAriaLive} from './live-announcer/live-announcer';\n\n\n@NgModule({\n  imports: [PlatformModule, ObserversModule],\n  declarations: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],\n  exports: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],\n})\nexport class A11yModule {\n  constructor(highContrastModeDetector: HighContrastModeDetector) {\n    highContrastModeDetector._applyBodyHighContrastModeCssClasses();\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 */\nexport * from './aria-describer/aria-describer';\nexport * from './key-manager/activedescendant-key-manager';\nexport * from './key-manager/focus-key-manager';\nexport * from './key-manager/list-key-manager';\nexport * from './focus-trap/configurable-focus-trap';\nexport * from './focus-trap/configurable-focus-trap-config';\nexport * from './focus-trap/configurable-focus-trap-factory';\nexport * from './focus-trap/event-listener-inert-strategy';\nexport * from './focus-trap/focus-trap';\nexport * from './focus-trap/focus-trap-inert-strategy';\nexport * from './interactivity-checker/interactivity-checker';\nexport {\n  InputModality,\n  InputModalityDetector,\n  InputModalityDetectorOptions,\n  INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS,\n  INPUT_MODALITY_DETECTOR_OPTIONS,\n} from './input-modality/input-modality-detector';\nexport * from './live-announcer/live-announcer';\nexport * from './live-announcer/live-announcer-tokens';\nexport * from './focus-monitor/focus-monitor';\nexport * from './fake-event-detection';\nexport * from './a11y-module';\nexport {\n  HighContrastModeDetector,\n  HighContrastMode,\n} from './high-contrast-mode/high-contrast-mode-detector';\n","/**\n * Generated bundle index. Do not edit.\n */\n\nexport * from './public-api';\n\nexport {FocusTrapManager as ɵangular_material_src_cdk_a11y_a11y_a} from 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