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Eudes Inácio
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281 KiB
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{"ast":null,"code":"import { DOCUMENT } from '@angular/common';\nimport { ɵɵdefineInjectable, ɵɵinject, Injectable, Inject, QueryList, NgZone, Directive, ElementRef, Input, InjectionToken, Optional, EventEmitter, Output, NgModule } from '@angular/core';\nimport { Subject, Subscription, of } from 'rxjs';\nimport { hasModifierKey, A, Z, ZERO, NINE, END, HOME, LEFT_ARROW, RIGHT_ARROW, UP_ARROW, DOWN_ARROW, TAB } from '@angular/cdk/keycodes';\nimport { tap, debounceTime, filter, map, take } from 'rxjs/operators';\nimport { coerceBooleanProperty, coerceElement } from '@angular/cdk/coercion';\nimport { Platform, normalizePassiveListenerOptions, _getShadowRoot, PlatformModule } from '@angular/cdk/platform';\nimport { ContentObserver, ObserversModule } from '@angular/cdk/observers';\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/** IDs are delimited by an empty space, as per the spec. */\nimport * as ɵngcc0 from '@angular/core';\nimport * as ɵngcc1 from '@angular/cdk/platform';\nimport * as ɵngcc2 from '@angular/cdk/observers';\nconst ID_DELIMITER = ' ';\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 */\nfunction addAriaReferencedId(el, attr, id) {\n const ids = getAriaReferenceIds(el, attr);\n if (ids.some(existingId => existingId.trim() == id.trim())) {\n return;\n }\n ids.push(id.trim());\n el.setAttribute(attr, ids.join(ID_DELIMITER));\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 */\nfunction removeAriaReferencedId(el, attr, id) {\n const ids = getAriaReferenceIds(el, attr);\n const filteredIds = ids.filter(val => val != id.trim());\n if (filteredIds.length) {\n el.setAttribute(attr, filteredIds.join(ID_DELIMITER));\n } else {\n el.removeAttribute(attr);\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 */\nfunction getAriaReferenceIds(el, attr) {\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/**\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/** ID used for the body container where all messages are appended. */\nconst MESSAGES_CONTAINER_ID = 'cdk-describedby-message-container';\n/** ID prefix used for each created message element. */\nconst CDK_DESCRIBEDBY_ID_PREFIX = 'cdk-describedby-message';\n/** Attribute given to each host element that is described by a message element. */\nconst CDK_DESCRIBEDBY_HOST_ATTRIBUTE = 'cdk-describedby-host';\n/** Global incremental identifier for each registered message element. */\nlet nextId = 0;\n/** Global map of all registered message elements that have been placed into the document. */\nconst messageRegistry = new Map();\n/** Container for all registered messages. */\nlet messagesContainer = null;\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 */\nclass AriaDescriber {\n constructor(_document) {\n this._document = _document;\n }\n describe(hostElement, message, role) {\n if (!this._canBeDescribed(hostElement, message)) {\n return;\n }\n const key = getKey(message, role);\n if (typeof message !== 'string') {\n // We need to ensure that the element has an ID.\n setMessageId(message);\n messageRegistry.set(key, {\n messageElement: message,\n referenceCount: 0\n });\n } else if (!messageRegistry.has(key)) {\n this._createMessageElement(message, role);\n }\n if (!this._isElementDescribedByMessage(hostElement, key)) {\n this._addMessageReference(hostElement, key);\n }\n }\n removeDescription(hostElement, message, role) {\n if (!message || !this._isElementNode(hostElement)) {\n return;\n }\n const key = getKey(message, role);\n if (this._isElementDescribedByMessage(hostElement, key)) {\n this._removeMessageReference(hostElement, key);\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 if (messagesContainer && messagesContainer.childNodes.length === 0) {\n this._deleteMessagesContainer();\n }\n }\n /** Unregisters all created message elements and removes the message container. */\n ngOnDestroy() {\n const describedElements = this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}]`);\n for (let i = 0; i < describedElements.length; i++) {\n this._removeCdkDescribedByReferenceIds(describedElements[i]);\n describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n }\n if (messagesContainer) {\n this._deleteMessagesContainer();\n }\n messageRegistry.clear();\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 _createMessageElement(message, role) {\n const messageElement = this._document.createElement('div');\n setMessageId(messageElement);\n messageElement.textContent = message;\n if (role) {\n messageElement.setAttribute('role', role);\n }\n this._createMessagesContainer();\n messagesContainer.appendChild(messageElement);\n messageRegistry.set(getKey(message, role), {\n messageElement,\n referenceCount: 0\n });\n }\n /** Deletes the message element from the global messages container. */\n _deleteMessageElement(key) {\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 /** Creates the global container for all aria-describedby messages. */\n _createMessagesContainer() {\n if (!messagesContainer) {\n const preExistingContainer = this._document.getElementById(MESSAGES_CONTAINER_ID);\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 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 this._document.body.appendChild(messagesContainer);\n }\n }\n /** Deletes the global messages container. */\n _deleteMessagesContainer() {\n if (messagesContainer && messagesContainer.parentNode) {\n messagesContainer.parentNode.removeChild(messagesContainer);\n messagesContainer = null;\n }\n }\n /** Removes all cdk-describedby messages that are hosted through the element. */\n _removeCdkDescribedByReferenceIds(element) {\n // Remove all aria-describedby reference IDs that are prefixed by CDK_DESCRIBEDBY_ID_PREFIX\n const originalReferenceIds = getAriaReferenceIds(element, 'aria-describedby').filter(id => id.indexOf(CDK_DESCRIBEDBY_ID_PREFIX) != 0);\n element.setAttribute('aria-describedby', originalReferenceIds.join(' '));\n }\n /**\n * Adds a message reference to the element using aria-describedby and increments the registered\n * message's reference count.\n */\n _addMessageReference(element, key) {\n const registeredMessage = messageRegistry.get(key);\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 * Removes a message reference from the element using aria-describedby\n * and decrements the registered message's reference count.\n */\n _removeMessageReference(element, key) {\n const registeredMessage = messageRegistry.get(key);\n registeredMessage.referenceCount--;\n removeAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id);\n element.removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n }\n /** Returns true if the element has been described by the provided message ID. */\n _isElementDescribedByMessage(element, key) {\n const referenceIds = getAriaReferenceIds(element, 'aria-describedby');\n const registeredMessage = messageRegistry.get(key);\n const messageId = registeredMessage && registeredMessage.messageElement.id;\n return !!messageId && referenceIds.indexOf(messageId) != -1;\n }\n /** Determines whether a message can be described on a particular element. */\n _canBeDescribed(element, message) {\n if (!this._isElementNode(element)) {\n return false;\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 const trimmedMessage = message == null ? '' : `${message}`.trim();\n const ariaLabel = element.getAttribute('aria-label');\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 /** Checks whether a node is an Element node. */\n _isElementNode(element) {\n return element.nodeType === this._document.ELEMENT_NODE;\n }\n}\nAriaDescriber.ɵfac = function AriaDescriber_Factory(t) {\n return new (t || AriaDescriber)(ɵngcc0.ɵɵinject(DOCUMENT));\n};\nAriaDescriber.ɵprov = ɵɵdefineInjectable({\n factory: function AriaDescriber_Factory() {\n return new AriaDescriber(ɵɵinject(DOCUMENT));\n },\n token: AriaDescriber,\n providedIn: \"root\"\n});\nAriaDescriber.ctorParameters = () => [{\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n}];\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(AriaDescriber, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], function () {\n return [{\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }];\n }, null);\n})();\n/** Gets a key that can be used to look messages up in the registry. */\nfunction getKey(message, role) {\n return typeof message === 'string' ? `${role || ''}/${message}` : message;\n}\n/** Assigns a unique ID to an element, if it doesn't have one already. */\nfunction setMessageId(element) {\n if (!element.id) {\n element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${nextId++}`;\n }\n}\n\n/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n/**\n * 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 */\nclass ListKeyManager {\n constructor(_items) {\n this._items = _items;\n this._activeItemIndex = -1;\n this._activeItem = null;\n this._wrap = false;\n this._letterKeyStream = new Subject();\n this._typeaheadSubscription = Subscription.EMPTY;\n this._vertical = true;\n this._allowedModifierKeys = [];\n this._homeAndEnd = false;\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 this._skipPredicateFn = item => item.disabled;\n // Buffer for the letters that the user has pressed when the typeahead option is turned on.\n this._pressedLetters = [];\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 this.tabOut = new Subject();\n /** Stream that emits whenever the active item of the list manager changes. */\n this.change = new Subject();\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 => {\n if (this._activeItem) {\n const itemArray = newItems.toArray();\n const newIndex = itemArray.indexOf(this._activeItem);\n if (newIndex > -1 && newIndex !== this._activeItemIndex) {\n this._activeItemIndex = newIndex;\n }\n }\n });\n }\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) {\n this._skipPredicateFn = predicate;\n return this;\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) {\n this._wrap = shouldWrap;\n return this;\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 = true) {\n this._vertical = enabled;\n return this;\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) {\n this._horizontal = direction;\n return this;\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) {\n this._allowedModifierKeys = keys;\n return this;\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 = 200) {\n if ((typeof ngDevMode === 'undefined' || ngDevMode) && this._items.length && this._items.some(item => typeof item.getLabel !== 'function')) {\n throw Error('ListKeyManager items in typeahead mode must implement the `getLabel` method.');\n }\n this._typeaheadSubscription.unsubscribe();\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(tap(letter => this._pressedLetters.push(letter)), debounceTime(debounceInterval), filter(() => this._pressedLetters.length > 0), map(() => this._pressedLetters.join(''))).subscribe(inputString => {\n const items = this._getItemsArray();\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 if (!this._skipPredicateFn(item) && item.getLabel().toUpperCase().trim().indexOf(inputString) === 0) {\n this.setActiveItem(index);\n break;\n }\n }\n this._pressedLetters = [];\n });\n return this;\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 = true) {\n this._homeAndEnd = enabled;\n return this;\n }\n setActiveItem(item) {\n const previousActiveItem = this._activeItem;\n this.updateActiveItem(item);\n if (this._activeItem !== previousActiveItem) {\n this.change.next(this._activeItemIndex);\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) {\n const keyCode = event.keyCode;\n const modifiers = ['altKey', 'ctrlKey', 'metaKey', 'shiftKey'];\n const isModifierAllowed = modifiers.every(modifier => {\n return !event[modifier] || this._allowedModifierKeys.indexOf(modifier) > -1;\n });\n switch (keyCode) {\n case TAB:\n this.tabOut.next();\n return;\n case DOWN_ARROW:\n if (this._vertical && isModifierAllowed) {\n this.setNextItemActive();\n break;\n } else {\n return;\n }\n case UP_ARROW:\n if (this._vertical && isModifierAllowed) {\n this.setPreviousItemActive();\n break;\n } else {\n return;\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 case LEFT_ARROW:\n if (this._horizontal && isModifierAllowed) {\n this._horizontal === 'rtl' ? this.setNextItemActive() : this.setPreviousItemActive();\n break;\n } else {\n return;\n }\n case HOME:\n if (this._homeAndEnd && isModifierAllowed) {\n this.setFirstItemActive();\n break;\n } else {\n return;\n }\n case END:\n if (this._homeAndEnd && isModifierAllowed) {\n this.setLastItemActive();\n break;\n } else {\n return;\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 // Note that we return here, in order to avoid preventing\n // the default action of non-navigational keys.\n return;\n }\n this._pressedLetters = [];\n event.preventDefault();\n }\n /** Index of the currently active item. */\n get activeItemIndex() {\n return this._activeItemIndex;\n }\n /** The active item. */\n get activeItem() {\n return this._activeItem;\n }\n /** Gets whether the user is currently typing into the manager using the typeahead feature. */\n isTyping() {\n return this._pressedLetters.length > 0;\n }\n /** Sets the active item to the first enabled item in the list. */\n setFirstItemActive() {\n this._setActiveItemByIndex(0, 1);\n }\n /** Sets the active item to the last enabled item in the list. */\n setLastItemActive() {\n this._setActiveItemByIndex(this._items.length - 1, -1);\n }\n /** Sets the active item to the next enabled item in the list. */\n setNextItemActive() {\n this._activeItemIndex < 0 ? this.setFirstItemActive() : this._setActiveItemByDelta(1);\n }\n /** Sets the active item to a previous enabled item in the list. */\n setPreviousItemActive() {\n this._activeItemIndex < 0 && this._wrap ? this.setLastItemActive() : this._setActiveItemByDelta(-1);\n }\n updateActiveItem(item) {\n const itemArray = this._getItemsArray();\n const index = typeof item === 'number' ? item : itemArray.indexOf(item);\n const activeItem = itemArray[index];\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 * 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 _setActiveItemByDelta(delta) {\n this._wrap ? this._setActiveInWrapMode(delta) : this._setActiveInDefaultMode(delta);\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 _setActiveInWrapMode(delta) {\n const items = this._getItemsArray();\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 if (!this._skipPredicateFn(item)) {\n this.setActiveItem(index);\n return;\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 _setActiveInDefaultMode(delta) {\n this._setActiveItemByIndex(this._activeItemIndex + delta, delta);\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 _setActiveItemByIndex(index, fallbackDelta) {\n const items = this._getItemsArray();\n if (!items[index]) {\n return;\n }\n while (this._skipPredicateFn(items[index])) {\n index += fallbackDelta;\n if (!items[index]) {\n return;\n }\n }\n this.setActiveItem(index);\n }\n /** Returns the items as an array. */\n _getItemsArray() {\n return this._items instanceof QueryList ? this._items.toArray() : this._items;\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 */\nclass ActiveDescendantKeyManager extends ListKeyManager {\n setActiveItem(index) {\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 */\nclass FocusKeyManager extends ListKeyManager {\n constructor() {\n super(...arguments);\n this._origin = '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) {\n this._origin = origin;\n return this;\n }\n setActiveItem(item) {\n super.setActiveItem(item);\n if (this.activeItem) {\n this.activeItem.focus(this._origin);\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/**\n * Configuration for the isFocusable method.\n */\nclass IsFocusableConfig {\n constructor() {\n /**\n * Whether to count an element as focusable even if it is not currently visible.\n */\n this.ignoreVisibility = 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 * Utility for checking the interactivity of an element, such as whether is is focusable or\n * tabbable.\n */\nclass InteractivityChecker {\n constructor(_platform) {\n this._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) {\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 * 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) {\n return hasGeometry(element) && getComputedStyle(element).visibility === 'visible';\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) {\n // Nothing is tabbable on the server 😎\n if (!this._platform.isBrowser) {\n return false;\n }\n const frameElement = getFrameElement(getWindow(element));\n if (frameElement) {\n // Frame elements inherit their tabindex onto all child elements.\n if (getTabIndexValue(frameElement) === -1) {\n return false;\n }\n // Browsers disable tabbing to an element inside of an invisible frame.\n if (!this.isVisible(frameElement)) {\n return false;\n }\n }\n let nodeName = element.nodeName.toLowerCase();\n let tabIndexValue = getTabIndexValue(element);\n if (element.hasAttribute('contenteditable')) {\n return tabIndexValue !== -1;\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 // 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 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 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 return element.tabIndex >= 0;\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, config) {\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) && ((config === null || config === void 0 ? void 0 : config.ignoreVisibility) || this.isVisible(element));\n }\n}\nInteractivityChecker.ɵfac = function InteractivityChecker_Factory(t) {\n return new (t || InteractivityChecker)(ɵngcc0.ɵɵinject(ɵngcc1.Platform));\n};\nInteractivityChecker.ɵprov = ɵɵdefineInjectable({\n factory: function InteractivityChecker_Factory() {\n return new InteractivityChecker(ɵɵinject(Platform));\n },\n token: InteractivityChecker,\n providedIn: \"root\"\n});\nInteractivityChecker.ctorParameters = () => [{\n type: Platform\n}];\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(InteractivityChecker, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], function () {\n return [{\n type: ɵngcc1.Platform\n }];\n }, null);\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) {\n try {\n return window.frameElement;\n } catch (_a) {\n return null;\n }\n}\n/** Checks whether the specified element has any geometry / rectangles. */\nfunction hasGeometry(element) {\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 || typeof element.getClientRects === 'function' && element.getClientRects().length);\n}\n/** Gets whether an element's */\nfunction isNativeFormElement(element) {\n let nodeName = element.nodeName.toLowerCase();\n return nodeName === 'input' || nodeName === 'select' || nodeName === 'button' || nodeName === 'textarea';\n}\n/** Gets whether an element is an `<input type=\"hidden\">`. */\nfunction isHiddenInput(element) {\n return isInputElement(element) && element.type == 'hidden';\n}\n/** Gets whether an element is an anchor that has an href attribute. */\nfunction isAnchorWithHref(element) {\n return isAnchorElement(element) && element.hasAttribute('href');\n}\n/** Gets whether an element is an input element. */\nfunction isInputElement(element) {\n return element.nodeName.toLowerCase() == 'input';\n}\n/** Gets whether an element is an anchor element. */\nfunction isAnchorElement(element) {\n return element.nodeName.toLowerCase() == 'a';\n}\n/** Gets whether an element has a valid tabindex. */\nfunction hasValidTabIndex(element) {\n if (!element.hasAttribute('tabindex') || element.tabIndex === undefined) {\n return false;\n }\n let tabIndex = element.getAttribute('tabindex');\n // IE11 parses tabindex=\"\" as the value \"-32768\"\n if (tabIndex == '-32768') {\n return false;\n }\n return !!(tabIndex && !isNaN(parseInt(tabIndex, 10)));\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) {\n if (!hasValidTabIndex(element)) {\n return null;\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 return isNaN(tabIndex) ? -1 : tabIndex;\n}\n/** Checks whether the specified element is potentially tabbable on iOS */\nfunction isPotentiallyTabbableIOS(element) {\n let nodeName = element.nodeName.toLowerCase();\n let inputType = nodeName === 'input' && element.type;\n return inputType === 'text' || inputType === 'password' || nodeName === 'select' || nodeName === 'textarea';\n}\n/**\n * Gets whether an element is potentially focusable without taking current visible/disabled state\n * into account.\n */\nfunction isPotentiallyFocusable(element) {\n // Inputs are potentially focusable *unless* they're type=\"hidden\".\n if (isHiddenInput(element)) {\n return false;\n }\n return isNativeFormElement(element) || isAnchorWithHref(element) || element.hasAttribute('contenteditable') || hasValidTabIndex(element);\n}\n/** Gets the parent window of a DOM node with regards of being inside of an iframe. */\nfunction getWindow(node) {\n // ownerDocument is null if `node` itself *is* a document.\n return node.ownerDocument && node.ownerDocument.defaultView || window;\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 * 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 */\nclass FocusTrap {\n constructor(_element, _checker, _ngZone, _document, deferAnchors = false) {\n this._element = _element;\n this._checker = _checker;\n this._ngZone = _ngZone;\n this._document = _document;\n this._hasAttached = false;\n // Event listeners for the anchors. Need to be regular functions so that we can unbind them later.\n this.startAnchorListener = () => this.focusLastTabbableElement();\n this.endAnchorListener = () => this.focusFirstTabbableElement();\n this._enabled = true;\n if (!deferAnchors) {\n this.attachAnchors();\n }\n }\n /** Whether the focus trap is active. */\n get enabled() {\n return this._enabled;\n }\n set enabled(value) {\n this._enabled = value;\n if (this._startAnchor && this._endAnchor) {\n this._toggleAnchorTabIndex(value, this._startAnchor);\n this._toggleAnchorTabIndex(value, this._endAnchor);\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 if (startAnchor) {\n startAnchor.removeEventListener('focus', this.startAnchorListener);\n if (startAnchor.parentNode) {\n startAnchor.parentNode.removeChild(startAnchor);\n }\n }\n if (endAnchor) {\n endAnchor.removeEventListener('focus', this.endAnchorListener);\n if (endAnchor.parentNode) {\n endAnchor.parentNode.removeChild(endAnchor);\n }\n }\n this._startAnchor = this._endAnchor = null;\n this._hasAttached = false;\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() {\n // If we're not on the browser, there can be no focus to trap.\n if (this._hasAttached) {\n return true;\n }\n this._ngZone.runOutsideAngular(() => {\n if (!this._startAnchor) {\n this._startAnchor = this._createAnchor();\n this._startAnchor.addEventListener('focus', this.startAnchorListener);\n }\n if (!this._endAnchor) {\n this._endAnchor = this._createAnchor();\n this._endAnchor.addEventListener('focus', this.endAnchorListener);\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 return this._hasAttached;\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() {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusInitialElement()));\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() {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusFirstTabbableElement()));\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() {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusLastTabbableElement()));\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 _getRegionBoundary(bound) {\n // Contains the deprecated version of selector, for temporary backwards comparability.\n let markers = this._element.querySelectorAll(`[cdk-focus-region-${bound}], ` + `[cdkFocusRegion${bound}], ` + `[cdk-focus-${bound}]`);\n for (let i = 0; i < markers.length; i++) {\n // @breaking-change 8.0.0\n if (markers[i].hasAttribute(`cdk-focus-${bound}`)) {\n console.warn(`Found use of deprecated attribute 'cdk-focus-${bound}', ` + `use 'cdkFocusRegion${bound}' instead. The deprecated ` + `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}', ` + `use 'cdkFocusRegion${bound}' instead. The deprecated attribute ` + `will be removed in 8.0.0.`, markers[i]);\n }\n }\n if (bound == 'start') {\n return markers.length ? markers[0] : this._getFirstTabbableElement(this._element);\n }\n return markers.length ? markers[markers.length - 1] : this._getLastTabbableElement(this._element);\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() {\n // Contains the deprecated version of selector, for temporary backwards comparability.\n const redirectToElement = this._element.querySelector(`[cdk-focus-initial], ` + `[cdkFocusInitial]`);\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', ` + `use 'cdkFocusInitial' instead. The deprecated attribute ` + `will be removed in 8.0.0`, redirectToElement);\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) && !this._checker.isFocusable(redirectToElement)) {\n console.warn(`Element matching '[cdkFocusInitial]' is not focusable.`, redirectToElement);\n }\n if (!this._checker.isFocusable(redirectToElement)) {\n const focusableChild = this._getFirstTabbableElement(redirectToElement);\n focusableChild === null || focusableChild === void 0 ? void 0 : focusableChild.focus();\n return !!focusableChild;\n }\n redirectToElement.focus();\n return true;\n }\n return this.focusFirstTabbableElement();\n }\n /**\n * Focuses the first tabbable element within the focus trap region.\n * @returns Whether focus was moved successfully.\n */\n focusFirstTabbableElement() {\n const redirectToElement = this._getRegionBoundary('start');\n if (redirectToElement) {\n redirectToElement.focus();\n }\n return !!redirectToElement;\n }\n /**\n * Focuses the last tabbable element within the focus trap region.\n * @returns Whether focus was moved successfully.\n */\n focusLastTabbableElement() {\n const redirectToElement = this._getRegionBoundary('end');\n if (redirectToElement) {\n redirectToElement.focus();\n }\n return !!redirectToElement;\n }\n /**\n * Checks whether the focus trap has successfully been attached.\n */\n hasAttached() {\n return this._hasAttached;\n }\n /** Get the first tabbable element from a DOM subtree (inclusive). */\n _getFirstTabbableElement(root) {\n if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {\n return root;\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 for (let i = 0; i < children.length; i++) {\n let tabbableChild = children[i].nodeType === this._document.ELEMENT_NODE ? this._getFirstTabbableElement(children[i]) : null;\n if (tabbableChild) {\n return tabbableChild;\n }\n }\n return null;\n }\n /** Get the last tabbable element from a DOM subtree (inclusive). */\n _getLastTabbableElement(root) {\n if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {\n return root;\n }\n // Iterate in reverse DOM order.\n let children = root.children || root.childNodes;\n for (let i = children.length - 1; i >= 0; i--) {\n let tabbableChild = children[i].nodeType === this._document.ELEMENT_NODE ? this._getLastTabbableElement(children[i]) : null;\n if (tabbableChild) {\n return tabbableChild;\n }\n }\n return null;\n }\n /** Creates an anchor element. */\n _createAnchor() {\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 * 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 _toggleAnchorTabIndex(isEnabled, anchor) {\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 * 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 toggleAnchors(enabled) {\n if (this._startAnchor && this._endAnchor) {\n this._toggleAnchorTabIndex(enabled, this._startAnchor);\n this._toggleAnchorTabIndex(enabled, this._endAnchor);\n }\n }\n /** Executes a function when the zone is stable. */\n _executeOnStable(fn) {\n if (this._ngZone.isStable) {\n fn();\n } else {\n this._ngZone.onStable.pipe(take(1)).subscribe(fn);\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 */\nclass FocusTrapFactory {\n constructor(_checker, _ngZone, _document) {\n this._checker = _checker;\n this._ngZone = _ngZone;\n this._document = _document;\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, deferCaptureElements = false) {\n return new FocusTrap(element, this._checker, this._ngZone, this._document, deferCaptureElements);\n }\n}\nFocusTrapFactory.ɵfac = function FocusTrapFactory_Factory(t) {\n return new (t || FocusTrapFactory)(ɵngcc0.ɵɵinject(InteractivityChecker), ɵngcc0.ɵɵinject(ɵngcc0.NgZone), ɵngcc0.ɵɵinject(DOCUMENT));\n};\nFocusTrapFactory.ɵprov = ɵɵdefineInjectable({\n factory: function FocusTrapFactory_Factory() {\n return new FocusTrapFactory(ɵɵinject(InteractivityChecker), ɵɵinject(NgZone), ɵɵinject(DOCUMENT));\n },\n token: FocusTrapFactory,\n providedIn: \"root\"\n});\nFocusTrapFactory.ctorParameters = () => [{\n type: InteractivityChecker\n}, {\n type: NgZone\n}, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n}];\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(FocusTrapFactory, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], function () {\n return [{\n type: InteractivityChecker\n }, {\n type: ɵngcc0.NgZone\n }, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }];\n }, null);\n})();\n/** Directive for trapping focus within a region. */\nclass CdkTrapFocus {\n constructor(_elementRef, _focusTrapFactory, _document) {\n this._elementRef = _elementRef;\n this._focusTrapFactory = _focusTrapFactory;\n /** Previously focused element to restore focus to upon destroy when using autoCapture. */\n this._previouslyFocusedElement = null;\n this._document = _document;\n this.focusTrap = this._focusTrapFactory.create(this._elementRef.nativeElement, true);\n }\n /** Whether the focus trap is active. */\n get enabled() {\n return this.focusTrap.enabled;\n }\n set enabled(value) {\n 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 get autoCapture() {\n return this._autoCapture;\n }\n set autoCapture(value) {\n this._autoCapture = coerceBooleanProperty(value);\n }\n ngOnDestroy() {\n this.focusTrap.destroy();\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 ngAfterContentInit() {\n this.focusTrap.attachAnchors();\n if (this.autoCapture) {\n this._captureFocus();\n }\n }\n ngDoCheck() {\n if (!this.focusTrap.hasAttached()) {\n this.focusTrap.attachAnchors();\n }\n }\n ngOnChanges(changes) {\n const autoCaptureChange = changes['autoCapture'];\n if (autoCaptureChange && !autoCaptureChange.firstChange && this.autoCapture && this.focusTrap.hasAttached()) {\n this._captureFocus();\n }\n }\n _captureFocus() {\n var _a, _b;\n // If the `activeElement` is inside a shadow root, `document.activeElement` will\n // point to the shadow root so we have to descend into it ourselves.\n const activeElement = (_a = this._document) === null || _a === void 0 ? void 0 : _a.activeElement;\n this._previouslyFocusedElement = ((_b = activeElement === null || activeElement === void 0 ? void 0 : activeElement.shadowRoot) === null || _b === void 0 ? void 0 : _b.activeElement) || activeElement;\n this.focusTrap.focusInitialElementWhenReady();\n }\n}\nCdkTrapFocus.ɵfac = function CdkTrapFocus_Factory(t) {\n return new (t || CdkTrapFocus)(ɵngcc0.ɵɵdirectiveInject(ɵngcc0.ElementRef), ɵngcc0.ɵɵdirectiveInject(FocusTrapFactory), ɵngcc0.ɵɵdirectiveInject(DOCUMENT));\n};\nCdkTrapFocus.ɵdir = /*@__PURE__*/ɵngcc0.ɵɵdefineDirective({\n type: CdkTrapFocus,\n selectors: [[\"\", \"cdkTrapFocus\", \"\"]],\n inputs: {\n enabled: [\"cdkTrapFocus\", \"enabled\"],\n autoCapture: [\"cdkTrapFocusAutoCapture\", \"autoCapture\"]\n },\n exportAs: [\"cdkTrapFocus\"],\n features: [ɵngcc0.ɵɵNgOnChangesFeature]\n});\nCdkTrapFocus.ctorParameters = () => [{\n type: ElementRef\n}, {\n type: FocusTrapFactory\n}, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n}];\nCdkTrapFocus.propDecorators = {\n enabled: [{\n type: Input,\n args: ['cdkTrapFocus']\n }],\n autoCapture: [{\n type: Input,\n args: ['cdkTrapFocusAutoCapture']\n }]\n};\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(CdkTrapFocus, [{\n type: Directive,\n args: [{\n selector: '[cdkTrapFocus]',\n exportAs: 'cdkTrapFocus'\n }]\n }], function () {\n return [{\n type: ɵngcc0.ElementRef\n }, {\n type: FocusTrapFactory\n }, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }];\n }, {\n enabled: [{\n type: Input,\n args: ['cdkTrapFocus']\n }],\n autoCapture: [{\n type: Input,\n args: ['cdkTrapFocusAutoCapture']\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/**\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 */\nclass ConfigurableFocusTrap extends FocusTrap {\n constructor(_element, _checker, _ngZone, _document, _focusTrapManager, _inertStrategy, config) {\n super(_element, _checker, _ngZone, _document, config.defer);\n this._focusTrapManager = _focusTrapManager;\n this._inertStrategy = _inertStrategy;\n this._focusTrapManager.register(this);\n }\n /** Whether the FocusTrap is enabled. */\n get enabled() {\n return this._enabled;\n }\n set enabled(value) {\n this._enabled = value;\n if (this._enabled) {\n this._focusTrapManager.register(this);\n } else {\n this._focusTrapManager.deregister(this);\n }\n }\n /** Notifies the FocusTrapManager that this FocusTrap will be destroyed. */\n destroy() {\n this._focusTrapManager.deregister(this);\n super.destroy();\n }\n /** @docs-private Implemented as part of ManagedFocusTrap. */\n _enable() {\n this._inertStrategy.preventFocus(this);\n this.toggleAnchors(true);\n }\n /** @docs-private Implemented as part of ManagedFocusTrap. */\n _disable() {\n this._inertStrategy.allowFocus(this);\n this.toggleAnchors(false);\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/** IE 11 compatible closest implementation that is able to start from non-Element Nodes. */\nfunction closest(element, selector) {\n if (!(element instanceof Node)) {\n return null;\n }\n let curr = element;\n while (curr != null && !(curr instanceof Element)) {\n curr = curr.parentNode;\n }\n return curr && (hasNativeClosest ? curr.closest(selector) : polyfillClosest(curr, selector));\n}\n/** Polyfill for browsers without Element.closest. */\nfunction polyfillClosest(element, selector) {\n let curr = element;\n while (curr != null && !(curr instanceof Element && matches(curr, selector))) {\n curr = curr.parentNode;\n }\n return curr || null;\n}\nconst hasNativeClosest = typeof Element != 'undefined' && !!Element.prototype.closest;\n/** IE 11 compatible matches implementation. */\nfunction matches(element, selector) {\n return element.matches ? element.matches(selector) : element['msMatchesSelector'](selector);\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 * Lightweight FocusTrapInertStrategy that adds a document focus event\n * listener to redirect focus back inside the FocusTrap.\n */\nclass EventListenerFocusTrapInertStrategy {\n constructor() {\n /** Focus event handler. */\n this._listener = null;\n }\n /** Adds a document event listener that keeps focus inside the FocusTrap. */\n preventFocus(focusTrap) {\n // Ensure there's only one listener per document\n if (this._listener) {\n focusTrap._document.removeEventListener('focus', this._listener, true);\n }\n this._listener = e => this._trapFocus(focusTrap, e);\n focusTrap._ngZone.runOutsideAngular(() => {\n focusTrap._document.addEventListener('focus', this._listener, true);\n });\n }\n /** Removes the event listener added in preventFocus. */\n allowFocus(focusTrap) {\n if (!this._listener) {\n return;\n }\n focusTrap._document.removeEventListener('focus', this._listener, true);\n this._listener = null;\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 _trapFocus(focusTrap, event) {\n const target = event.target;\n const focusTrapRoot = focusTrap._element;\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/**\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 * Configuration for creating a ConfigurableFocusTrap.\n */\nclass ConfigurableFocusTrapConfig {\n constructor() {\n /**\n * Whether to defer the creation of FocusTrap elements to be\n * done manually by the user. Default is to create them\n * automatically.\n */\n this.defer = false;\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/** The injection token used to specify the inert strategy. */\nconst FOCUS_TRAP_INERT_STRATEGY = new InjectionToken('FOCUS_TRAP_INERT_STRATEGY');\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/** Injectable that ensures only the most recently enabled FocusTrap is active. */\nclass FocusTrapManager {\n constructor() {\n // A stack of the FocusTraps on the page. Only the FocusTrap at the\n // top of the stack is active.\n this._focusTrapStack = [];\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) {\n // Dedupe focusTraps that register multiple times.\n this._focusTrapStack = this._focusTrapStack.filter(ft => ft !== focusTrap);\n let stack = this._focusTrapStack;\n if (stack.length) {\n stack[stack.length - 1]._disable();\n }\n stack.push(focusTrap);\n focusTrap._enable();\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) {\n focusTrap._disable();\n const stack = this._focusTrapStack;\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}\nFocusTrapManager.ɵfac = function FocusTrapManager_Factory(t) {\n return new (t || FocusTrapManager)();\n};\nFocusTrapManager.ɵprov = ɵɵdefineInjectable({\n factory: function FocusTrapManager_Factory() {\n return new FocusTrapManager();\n },\n token: FocusTrapManager,\n providedIn: \"root\"\n});\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(FocusTrapManager, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], function () {\n return [];\n }, null);\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/** Factory that allows easy instantiation of configurable focus traps. */\nclass ConfigurableFocusTrapFactory {\n constructor(_checker, _ngZone, _focusTrapManager, _document, _inertStrategy) {\n this._checker = _checker;\n this._ngZone = _ngZone;\n this._focusTrapManager = _focusTrapManager;\n this._document = _document;\n // TODO split up the strategies into different modules, similar to DateAdapter.\n this._inertStrategy = _inertStrategy || new EventListenerFocusTrapInertStrategy();\n }\n create(element, config = new ConfigurableFocusTrapConfig()) {\n let configObject;\n if (typeof config === 'boolean') {\n configObject = new ConfigurableFocusTrapConfig();\n configObject.defer = config;\n } else {\n configObject = config;\n }\n return new ConfigurableFocusTrap(element, this._checker, this._ngZone, this._document, this._focusTrapManager, this._inertStrategy, configObject);\n }\n}\nConfigurableFocusTrapFactory.ɵfac = function ConfigurableFocusTrapFactory_Factory(t) {\n return new (t || ConfigurableFocusTrapFactory)(ɵngcc0.ɵɵinject(InteractivityChecker), ɵngcc0.ɵɵinject(ɵngcc0.NgZone), ɵngcc0.ɵɵinject(FocusTrapManager), ɵngcc0.ɵɵinject(DOCUMENT), ɵngcc0.ɵɵinject(FOCUS_TRAP_INERT_STRATEGY, 8));\n};\nConfigurableFocusTrapFactory.ɵprov = ɵɵdefineInjectable({\n factory: function ConfigurableFocusTrapFactory_Factory() {\n return new ConfigurableFocusTrapFactory(ɵɵinject(InteractivityChecker), ɵɵinject(NgZone), ɵɵinject(FocusTrapManager), ɵɵinject(DOCUMENT), ɵɵinject(FOCUS_TRAP_INERT_STRATEGY, 8));\n },\n token: ConfigurableFocusTrapFactory,\n providedIn: \"root\"\n});\nConfigurableFocusTrapFactory.ctorParameters = () => [{\n type: InteractivityChecker\n}, {\n type: NgZone\n}, {\n type: FocusTrapManager\n}, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n}, {\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [FOCUS_TRAP_INERT_STRATEGY]\n }]\n}];\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(ConfigurableFocusTrapFactory, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], function () {\n return [{\n type: InteractivityChecker\n }, {\n type: ɵngcc0.NgZone\n }, {\n type: FocusTrapManager\n }, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }, {\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [FOCUS_TRAP_INERT_STRATEGY]\n }]\n }];\n }, null);\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 */\nconst LIVE_ANNOUNCER_ELEMENT_TOKEN = new InjectionToken('liveAnnouncerElement', {\n providedIn: 'root',\n factory: LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY\n});\n/** @docs-private */\nfunction LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY() {\n return null;\n}\n/** Injection token that can be used to configure the default options for the LiveAnnouncer. */\nconst LIVE_ANNOUNCER_DEFAULT_OPTIONS = new InjectionToken('LIVE_ANNOUNCER_DEFAULT_OPTIONS');\n\n/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nclass LiveAnnouncer {\n constructor(elementToken, _ngZone, _document, _defaultOptions) {\n this._ngZone = _ngZone;\n this._defaultOptions = _defaultOptions;\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 announce(message, ...args) {\n const defaultOptions = this._defaultOptions;\n let politeness;\n let duration;\n if (args.length === 1 && typeof args[0] === 'number') {\n duration = args[0];\n } else {\n [politeness, duration] = args;\n }\n this.clear();\n clearTimeout(this._previousTimeout);\n if (!politeness) {\n politeness = defaultOptions && defaultOptions.politeness ? defaultOptions.politeness : 'polite';\n }\n if (duration == null && defaultOptions) {\n duration = defaultOptions.duration;\n }\n // TODO: ensure changing the politeness works on all environments we support.\n this._liveElement.setAttribute('aria-live', politeness);\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 if (typeof duration === 'number') {\n this._previousTimeout = setTimeout(() => this.clear(), duration);\n }\n }, 100);\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 ngOnDestroy() {\n clearTimeout(this._previousTimeout);\n if (this._liveElement && this._liveElement.parentNode) {\n this._liveElement.parentNode.removeChild(this._liveElement);\n this._liveElement = null;\n }\n }\n _createLiveElement() {\n const elementClass = 'cdk-live-announcer-element';\n const previousElements = this._document.getElementsByClassName(elementClass);\n const liveEl = this._document.createElement('div');\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 liveEl.classList.add(elementClass);\n liveEl.classList.add('cdk-visually-hidden');\n liveEl.setAttribute('aria-atomic', 'true');\n liveEl.setAttribute('aria-live', 'polite');\n this._document.body.appendChild(liveEl);\n return liveEl;\n }\n}\nLiveAnnouncer.ɵfac = function LiveAnnouncer_Factory(t) {\n return new (t || LiveAnnouncer)(ɵngcc0.ɵɵinject(LIVE_ANNOUNCER_ELEMENT_TOKEN, 8), ɵngcc0.ɵɵinject(ɵngcc0.NgZone), ɵngcc0.ɵɵinject(DOCUMENT), ɵngcc0.ɵɵinject(LIVE_ANNOUNCER_DEFAULT_OPTIONS, 8));\n};\nLiveAnnouncer.ɵprov = ɵɵdefineInjectable({\n factory: function LiveAnnouncer_Factory() {\n return new LiveAnnouncer(ɵɵinject(LIVE_ANNOUNCER_ELEMENT_TOKEN, 8), ɵɵinject(NgZone), ɵɵinject(DOCUMENT), ɵɵinject(LIVE_ANNOUNCER_DEFAULT_OPTIONS, 8));\n },\n token: LiveAnnouncer,\n providedIn: \"root\"\n});\nLiveAnnouncer.ctorParameters = () => [{\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [LIVE_ANNOUNCER_ELEMENT_TOKEN]\n }]\n}, {\n type: NgZone\n}, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n}, {\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [LIVE_ANNOUNCER_DEFAULT_OPTIONS]\n }]\n}];\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(LiveAnnouncer, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], function () {\n return [{\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [LIVE_ANNOUNCER_ELEMENT_TOKEN]\n }]\n }, {\n type: ɵngcc0.NgZone\n }, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }, {\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [LIVE_ANNOUNCER_DEFAULT_OPTIONS]\n }]\n }];\n }, null);\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 */\nclass CdkAriaLive {\n constructor(_elementRef, _liveAnnouncer, _contentObserver, _ngZone) {\n this._elementRef = _elementRef;\n this._liveAnnouncer = _liveAnnouncer;\n this._contentObserver = _contentObserver;\n this._ngZone = _ngZone;\n this._politeness = 'polite';\n }\n /** The aria-live politeness level to use when announcing messages. */\n get politeness() {\n return this._politeness;\n }\n set politeness(value) {\n this._politeness = value === 'off' || value === 'assertive' ? value : 'polite';\n if (this._politeness === 'off') {\n if (this._subscription) {\n this._subscription.unsubscribe();\n this._subscription = null;\n }\n } else if (!this._subscription) {\n this._subscription = this._ngZone.runOutsideAngular(() => {\n return this._contentObserver.observe(this._elementRef).subscribe(() => {\n // Note that we use textContent here, rather than innerText, in order to avoid a reflow.\n const elementText = this._elementRef.nativeElement.textContent;\n // 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 ngOnDestroy() {\n if (this._subscription) {\n this._subscription.unsubscribe();\n }\n }\n}\nCdkAriaLive.ɵfac = function CdkAriaLive_Factory(t) {\n return new (t || CdkAriaLive)(ɵngcc0.ɵɵdirectiveInject(ɵngcc0.ElementRef), ɵngcc0.ɵɵdirectiveInject(LiveAnnouncer), ɵngcc0.ɵɵdirectiveInject(ɵngcc2.ContentObserver), ɵngcc0.ɵɵdirectiveInject(ɵngcc0.NgZone));\n};\nCdkAriaLive.ɵdir = /*@__PURE__*/ɵngcc0.ɵɵdefineDirective({\n type: CdkAriaLive,\n selectors: [[\"\", \"cdkAriaLive\", \"\"]],\n inputs: {\n politeness: [\"cdkAriaLive\", \"politeness\"]\n },\n exportAs: [\"cdkAriaLive\"]\n});\nCdkAriaLive.ctorParameters = () => [{\n type: ElementRef\n}, {\n type: LiveAnnouncer\n}, {\n type: ContentObserver\n}, {\n type: NgZone\n}];\nCdkAriaLive.propDecorators = {\n politeness: [{\n type: Input,\n args: ['cdkAriaLive']\n }]\n};\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(CdkAriaLive, [{\n type: Directive,\n args: [{\n selector: '[cdkAriaLive]',\n exportAs: 'cdkAriaLive'\n }]\n }], function () {\n return [{\n type: ɵngcc0.ElementRef\n }, {\n type: LiveAnnouncer\n }, {\n type: ɵngcc2.ContentObserver\n }, {\n type: ɵngcc0.NgZone\n }];\n }, {\n politeness: [{\n type: Input,\n args: ['cdkAriaLive']\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/** Gets whether an event could be a faked `mousedown` event dispatched by a screen reader. */\nfunction isFakeMousedownFromScreenReader(event) {\n // We can typically distinguish between these faked mousedown events and real mousedown events\n // using the \"buttons\" property. While real mousedowns will indicate the mouse button that was\n // pressed (e.g. \"1\" for the left mouse button), faked mousedowns will usually set the property\n // value to 0.\n return event.buttons === 0;\n}\n/** Gets whether an event could be a faked `touchstart` event dispatched by a screen reader. */\nfunction isFakeTouchstartFromScreenReader(event) {\n const touch = event.touches && event.touches[0] || event.changedTouches && event.changedTouches[0];\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) && (touch.radiusY == null || touch.radiusY === 1);\n}\n\n/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n// 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.\nconst TOUCH_BUFFER_MS = 650;\n/** InjectionToken for FocusMonitorOptions. */\nconst FOCUS_MONITOR_DEFAULT_OPTIONS = new InjectionToken('cdk-focus-monitor-default-options');\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/** Monitors mouse and keyboard events to determine the cause of focus events. */\nclass FocusMonitor {\n constructor(_ngZone, _platform, /** @breaking-change 11.0.0 make document required */\n document, options) {\n this._ngZone = _ngZone;\n this._platform = _platform;\n /** The focus origin that the next focus event is a result of. */\n this._origin = null;\n /** Whether the window has just been focused. */\n this._windowFocused = false;\n /** Map of elements being monitored to their info. */\n this._elementInfo = new Map();\n /** The number of elements currently being monitored. */\n this._monitoredElementCount = 0;\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 this._rootNodeFocusListenerCount = new Map();\n /**\n * Event listener for `keydown` events on the document.\n * Needs to be an arrow function in order to preserve the context when it gets bound.\n */\n this._documentKeydownListener = () => {\n // On keydown record the origin and clear any touch event that may be in progress.\n this._lastTouchTarget = null;\n this._setOriginForCurrentEventQueue('keyboard');\n };\n /**\n * Event listener for `mousedown` events on the document.\n * Needs to be an arrow function in order to preserve the context when it gets bound.\n */\n this._documentMousedownListener = event => {\n // On mousedown record the origin only if there is not touch\n // target, since a mousedown can happen as a result of a touch event.\n if (!this._lastTouchTarget) {\n // In some cases screen readers fire fake `mousedown` events instead of `keydown`.\n // Resolve the focus source to `keyboard` if we detect one of them.\n const source = isFakeMousedownFromScreenReader(event) ? 'keyboard' : 'mouse';\n this._setOriginForCurrentEventQueue(source);\n }\n };\n /**\n * Event listener for `touchstart` events on the document.\n * Needs to be an arrow function in order to preserve the context when it gets bound.\n */\n this._documentTouchstartListener = event => {\n // Some screen readers will fire a fake `touchstart` event if an element is activated using\n // the keyboard while on a device with a touchsreen. Consider such events as keyboard focus.\n if (!isFakeTouchstartFromScreenReader(event)) {\n // When the touchstart event fires the focus event is not yet in the event queue. This means\n // we can't rely on the trick used above (setting timeout of 1ms). Instead we wait 650ms to\n // see if a focus happens.\n if (this._touchTimeoutId != null) {\n clearTimeout(this._touchTimeoutId);\n }\n this._lastTouchTarget = getTarget(event);\n this._touchTimeoutId = setTimeout(() => this._lastTouchTarget = null, TOUCH_BUFFER_MS);\n } else if (!this._lastTouchTarget) {\n this._setOriginForCurrentEventQueue('keyboard');\n }\n };\n /**\n * Event listener for `focus` events on the window.\n * Needs to be an arrow function in order to preserve the context when it gets bound.\n */\n this._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 * 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 this._rootNodeFocusAndBlurListener = event => {\n const target = getTarget(event);\n const handler = event.type === 'focus' ? this._onFocus : this._onBlur;\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, element);\n }\n };\n this._document = document;\n this._detectionMode = (options === null || options === void 0 ? void 0 : options.detectionMode) || 0 /* IMMEDIATE */;\n }\n\n monitor(element, checkChildren = false) {\n const nativeElement = coerceElement(element);\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 of(null);\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 // 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 return cachedInfo.subject;\n }\n // Create monitored element info.\n const info = {\n checkChildren: checkChildren,\n subject: new Subject(),\n rootNode\n };\n this._elementInfo.set(nativeElement, info);\n this._registerGlobalListeners(info);\n return info.subject;\n }\n stopMonitoring(element) {\n const nativeElement = coerceElement(element);\n const elementInfo = this._elementInfo.get(nativeElement);\n if (elementInfo) {\n elementInfo.subject.complete();\n this._setClasses(nativeElement);\n this._elementInfo.delete(nativeElement);\n this._removeGlobalListeners(elementInfo);\n }\n }\n focusVia(element, origin, options) {\n const nativeElement = coerceElement(element);\n const focusedElement = this._getDocument().activeElement;\n // If the element is focused already, calling `focus` again won't trigger the event listener\n // which means that the focus classes won't be updated. If that's the case, update the classes\n // directly without waiting for an event.\n if (nativeElement === focusedElement) {\n this._getClosestElementsInfo(nativeElement).forEach(([currentElement, info]) => this._originChanged(currentElement, origin, info));\n } else {\n this._setOriginForCurrentEventQueue(origin);\n // `focus` isn't available on the server\n if (typeof nativeElement.focus === 'function') {\n nativeElement.focus(options);\n }\n }\n }\n ngOnDestroy() {\n this._elementInfo.forEach((_info, element) => this.stopMonitoring(element));\n }\n /** Access injected document if available or fallback to global document reference */\n _getDocument() {\n return this._document || document;\n }\n /** Use defaultView of injected document if available or fallback to global window reference */\n _getWindow() {\n const doc = this._getDocument();\n return doc.defaultView || window;\n }\n _toggleClass(element, className, shouldSet) {\n if (shouldSet) {\n element.classList.add(className);\n } else {\n element.classList.remove(className);\n }\n }\n _getFocusOrigin(event) {\n // If we couldn't detect a cause for the focus event, it's due to one of three reasons:\n // 1) The window has just regained focus, in which case we want to restore the focused state of\n // the element from before the window blurred.\n // 2) It was caused by a touch event, in which case we mark the origin as 'touch'.\n // 3) The element was programmatically focused, in which case we should mark the origin as\n // 'program'.\n if (this._origin) {\n return this._origin;\n }\n if (this._windowFocused && this._lastFocusOrigin) {\n return this._lastFocusOrigin;\n } else if (this._wasCausedByTouch(event)) {\n return 'touch';\n } else {\n return 'program';\n }\n }\n /**\n * 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 _setClasses(element, origin) {\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 * Sets the origin and schedules an async function to clear it at the end of the event queue.\n * If the detection mode is 'eventual', the origin is never cleared.\n * @param origin The origin to set.\n */\n _setOriginForCurrentEventQueue(origin) {\n this._ngZone.runOutsideAngular(() => {\n this._origin = origin;\n if (this._detectionMode === 0 /* IMMEDIATE */) {\n // Sometimes the focus origin won't be valid in Firefox because Firefox seems to focus *one*\n // tick after the interaction event fired. To ensure the focus origin is always correct,\n // the focus origin will be determined at the beginning of the next tick.\n this._originTimeoutId = setTimeout(() => this._origin = null, 1);\n }\n });\n }\n /**\n * Checks whether the given focus event was caused by a touchstart event.\n * @param event The focus event to check.\n * @returns Whether the event was caused by a touch.\n */\n _wasCausedByTouch(event) {\n // Note(mmalerba): This implementation is not quite perfect, there is a small edge case.\n // Consider the following dom structure:\n //\n // <div #parent tabindex=\"0\" cdkFocusClasses>\n // <div #child (click)=\"#parent.focus()\"></div>\n // </div>\n //\n // If the user touches the #child element and the #parent is programmatically focused as a\n // result, this code will still consider it to have been caused by the touch event and will\n // apply the cdk-touch-focused class rather than the cdk-program-focused class. This is a\n // relatively small edge-case that can be worked around by using\n // focusVia(parentEl, 'program') to focus the parent element.\n //\n // If we decide that we absolutely must handle this case correctly, we can do so by listening\n // for the first focus event after the touchstart, and then the first blur event after that\n // focus event. When that blur event fires we know that whatever follows is not a result of the\n // touchstart.\n const focusTarget = getTarget(event);\n return this._lastTouchTarget instanceof Node && focusTarget instanceof Node && (focusTarget === this._lastTouchTarget || focusTarget.contains(this._lastTouchTarget));\n }\n /**\n * Handles focus events on a registered element.\n * @param event The focus event.\n * @param element The monitored element.\n */\n _onFocus(event, element) {\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. 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this._emitOrigin(elementInfo.subject, null);\n }\n _emitOrigin(subject, origin) {\n this._ngZone.run(() => subject.next(origin));\n }\n _registerGlobalListeners(elementInfo) {\n if (!this._platform.isBrowser) {\n return;\n }\n const rootNode = elementInfo.rootNode;\n const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode) || 0;\n if (!rootNodeFocusListeners) {\n this._ngZone.runOutsideAngular(() => {\n rootNode.addEventListener('focus', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);\n rootNode.addEventListener('blur', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);\n });\n }\n this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners + 1);\n // Register global listeners when first element is monitored.\n if (++this._monitoredElementCount === 1) {\n // Note: we listen to events in the capture phase so we\n // can detect them even if the user stops propagation.\n this._ngZone.runOutsideAngular(() => {\n const document = this._getDocument();\n const window = this._getWindow();\n document.addEventListener('keydown', this._documentKeydownListener, captureEventListenerOptions);\n document.addEventListener('mousedown', this._documentMousedownListener, captureEventListenerOptions);\n document.addEventListener('touchstart', this._documentTouchstartListener, captureEventListenerOptions);\n window.addEventListener('focus', this._windowFocusListener);\n });\n }\n }\n _removeGlobalListeners(elementInfo) {\n const rootNode = elementInfo.rootNode;\n if (this._rootNodeFocusListenerCount.has(rootNode)) {\n const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode);\n if (rootNodeFocusListeners > 1) {\n this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners - 1);\n } else {\n rootNode.removeEventListener('focus', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);\n rootNode.removeEventListener('blur', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);\n this._rootNodeFocusListenerCount.delete(rootNode);\n }\n }\n // Unregister global listeners when last element is unmonitored.\n if (! --this._monitoredElementCount) {\n const document = this._getDocument();\n const window = this._getWindow();\n document.removeEventListener('keydown', this._documentKeydownListener, captureEventListenerOptions);\n document.removeEventListener('mousedown', this._documentMousedownListener, captureEventListenerOptions);\n document.removeEventListener('touchstart', this._documentTouchstartListener, captureEventListenerOptions);\n window.removeEventListener('focus', this._windowFocusListener);\n // Clear timeouts for all potentially pending timeouts to prevent the leaks.\n clearTimeout(this._windowFocusTimeoutId);\n clearTimeout(this._touchTimeoutId);\n clearTimeout(this._originTimeoutId);\n }\n }\n /** Updates all the state on an element once its focus origin has changed. */\n _originChanged(element, origin, elementInfo) {\n this._setClasses(element, origin);\n this._emitOrigin(elementInfo.subject, origin);\n this._lastFocusOrigin = origin;\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 _getClosestElementsInfo(element) {\n const results = [];\n this._elementInfo.forEach((info, currentElement) => {\n if (currentElement === element || info.checkChildren && currentElement.contains(element)) {\n results.push([currentElement, info]);\n }\n });\n return results;\n }\n}\nFocusMonitor.ɵfac = function FocusMonitor_Factory(t) {\n return new (t || FocusMonitor)(ɵngcc0.ɵɵinject(ɵngcc0.NgZone), ɵngcc0.ɵɵinject(ɵngcc1.Platform), ɵngcc0.ɵɵinject(DOCUMENT, 8), ɵngcc0.ɵɵinject(FOCUS_MONITOR_DEFAULT_OPTIONS, 8));\n};\nFocusMonitor.ɵprov = ɵɵdefineInjectable({\n factory: function FocusMonitor_Factory() {\n return new FocusMonitor(ɵɵinject(NgZone), ɵɵinject(Platform), ɵɵinject(DOCUMENT, 8), ɵɵinject(FOCUS_MONITOR_DEFAULT_OPTIONS, 8));\n },\n token: FocusMonitor,\n providedIn: \"root\"\n});\nFocusMonitor.ctorParameters = () => [{\n type: NgZone\n}, {\n type: Platform\n}, {\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [DOCUMENT]\n }]\n}, {\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [FOCUS_MONITOR_DEFAULT_OPTIONS]\n }]\n}];\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(FocusMonitor, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], function () {\n return [{\n type: ɵngcc0.NgZone\n }, {\n type: ɵngcc1.Platform\n }, {\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [DOCUMENT]\n }]\n }, {\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [FOCUS_MONITOR_DEFAULT_OPTIONS]\n }]\n }];\n }, null);\n})();\n/** Gets the target of an event, accounting for Shadow DOM. */\nfunction getTarget(event) {\n // If an event is bound outside the Shadow DOM, the `event.target` will\n // point to the shadow root so we have to use `composedPath` instead.\n return event.composedPath ? event.composedPath()[0] : event.target;\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 */\nclass CdkMonitorFocus {\n constructor(_elementRef, _focusMonitor) {\n this._elementRef = _elementRef;\n this._focusMonitor = _focusMonitor;\n this.cdkFocusChange = new EventEmitter();\n }\n ngAfterViewInit() {\n const element = this._elementRef.nativeElement;\n this._monitorSubscription = this._focusMonitor.monitor(element, element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus')).subscribe(origin => this.cdkFocusChange.emit(origin));\n }\n ngOnDestroy() {\n this._focusMonitor.stopMonitoring(this._elementRef);\n if (this._monitorSubscription) {\n this._monitorSubscription.unsubscribe();\n }\n }\n}\nCdkMonitorFocus.ɵfac = function CdkMonitorFocus_Factory(t) {\n return new (t || CdkMonitorFocus)(ɵngcc0.ɵɵdirectiveInject(ɵngcc0.ElementRef), ɵngcc0.ɵɵdirectiveInject(FocusMonitor));\n};\nCdkMonitorFocus.ɵdir = /*@__PURE__*/ɵngcc0.ɵɵdefineDirective({\n type: CdkMonitorFocus,\n selectors: [[\"\", \"cdkMonitorElementFocus\", \"\"], [\"\", \"cdkMonitorSubtreeFocus\", \"\"]],\n outputs: {\n cdkFocusChange: \"cdkFocusChange\"\n }\n});\nCdkMonitorFocus.ctorParameters = () => [{\n type: ElementRef\n}, {\n type: FocusMonitor\n}];\nCdkMonitorFocus.propDecorators = {\n cdkFocusChange: [{\n type: Output\n }]\n};\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(CdkMonitorFocus, [{\n type: Directive,\n args: [{\n selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]'\n }]\n }], function () {\n return [{\n type: ɵngcc0.ElementRef\n }, {\n type: FocusMonitor\n }];\n }, {\n cdkFocusChange: [{\n type: Output\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/** CSS class applied to the document body when in black-on-white high-contrast mode. */\nconst BLACK_ON_WHITE_CSS_CLASS = 'cdk-high-contrast-black-on-white';\n/** CSS class applied to the document body when in white-on-black high-contrast mode. */\nconst WHITE_ON_BLACK_CSS_CLASS = 'cdk-high-contrast-white-on-black';\n/** CSS class applied to the document body when in high-contrast mode. */\nconst HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS = 'cdk-high-contrast-active';\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 */\nclass HighContrastModeDetector {\n constructor(_platform, document) {\n this._platform = _platform;\n this._document = document;\n }\n /** Gets the current high-contrast-mode for the page. */\n getHighContrastMode() {\n if (!this._platform.isBrowser) {\n return 0 /* NONE */;\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 // 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 ? documentWindow.getComputedStyle(testElement) : null;\n const computedColor = (computedStyle && computedStyle.backgroundColor || '').replace(/ /g, '');\n this._document.body.removeChild(testElement);\n switch (computedColor) {\n case 'rgb(0,0,0)':\n return 2 /* WHITE_ON_BLACK */;\n case 'rgb(255,255,255)':\n return 1 /* BLACK_ON_WHITE */;\n }\n\n return 0 /* NONE */;\n }\n /** Applies CSS classes indicating high-contrast mode to document body (browser-only). */\n _applyBodyHighContrastModeCssClasses() {\n if (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 const mode = this.getHighContrastMode();\n if (mode === 1 /* BLACK_ON_WHITE */) {\n bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);\n bodyClasses.add(BLACK_ON_WHITE_CSS_CLASS);\n } else if (mode === 2 /* WHITE_ON_BLACK */) {\n bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);\n bodyClasses.add(WHITE_ON_BLACK_CSS_CLASS);\n }\n }\n }\n}\nHighContrastModeDetector.ɵfac = function HighContrastModeDetector_Factory(t) {\n return new (t || HighContrastModeDetector)(ɵngcc0.ɵɵinject(ɵngcc1.Platform), ɵngcc0.ɵɵinject(DOCUMENT));\n};\nHighContrastModeDetector.ɵprov = ɵɵdefineInjectable({\n factory: function HighContrastModeDetector_Factory() {\n return new HighContrastModeDetector(ɵɵinject(Platform), ɵɵinject(DOCUMENT));\n },\n token: HighContrastModeDetector,\n providedIn: \"root\"\n});\nHighContrastModeDetector.ctorParameters = () => [{\n type: Platform\n}, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n}];\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(HighContrastModeDetector, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], function () {\n return [{\n type: ɵngcc1.Platform\n }, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }];\n }, null);\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 */\nclass A11yModule {\n constructor(highContrastModeDetector) {\n highContrastModeDetector._applyBodyHighContrastModeCssClasses();\n }\n}\nA11yModule.ɵfac = function A11yModule_Factory(t) {\n return new (t || A11yModule)(ɵngcc0.ɵɵinject(HighContrastModeDetector));\n};\nA11yModule.ɵmod = /*@__PURE__*/ɵngcc0.ɵɵdefineNgModule({\n type: A11yModule\n});\nA11yModule.ɵinj = /*@__PURE__*/ɵngcc0.ɵɵdefineInjector({\n imports: [PlatformModule, ObserversModule]\n});\nA11yModule.ctorParameters = () => [{\n type: HighContrastModeDetector\n}];\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(A11yModule, [{\n type: NgModule,\n args: [{\n imports: [PlatformModule, ObserversModule],\n declarations: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],\n exports: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus]\n }]\n }], function () {\n return [{\n type: HighContrastModeDetector\n }];\n }, null);\n})();\n(function () {\n (typeof ngJitMode === \"undefined\" || ngJitMode) && ɵngcc0.ɵɵsetNgModuleScope(A11yModule, {\n declarations: function () {\n return [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus];\n },\n imports: function () {\n return [PlatformModule, ObserversModule];\n },\n exports: function () {\n return [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus];\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\n/**\n * Generated bundle index. Do not edit.\n */\n\nexport { A11yModule, ActiveDescendantKeyManager, AriaDescriber, CDK_DESCRIBEDBY_HOST_ATTRIBUTE, CDK_DESCRIBEDBY_ID_PREFIX, CdkAriaLive, CdkMonitorFocus, CdkTrapFocus, ConfigurableFocusTrap, ConfigurableFocusTrapFactory, EventListenerFocusTrapInertStrategy, FOCUS_MONITOR_DEFAULT_OPTIONS, FOCUS_TRAP_INERT_STRATEGY, FocusKeyManager, FocusMonitor, FocusTrap, FocusTrapFactory, HighContrastModeDetector, InteractivityChecker, IsFocusableConfig, LIVE_ANNOUNCER_DEFAULT_OPTIONS, LIVE_ANNOUNCER_ELEMENT_TOKEN, LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY, ListKeyManager, LiveAnnouncer, MESSAGES_CONTAINER_ID, TOUCH_BUFFER_MS, isFakeMousedownFromScreenReader, isFakeTouchstartFromScreenReader, FocusTrapManager as ɵangular_material_src_cdk_a11y_a11y_a, ConfigurableFocusTrapConfig as ɵangular_material_src_cdk_a11y_a11y_b 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{ DOCUMENT } from '@angular/common';\nimport { ɵɵdefineInjectable, ɵɵinject, Injectable, Inject, QueryList, NgZone, Directive, ElementRef, Input, InjectionToken, Optional, EventEmitter, Output, NgModule } from '@angular/core';\nimport { Subject, Subscription, of } from 'rxjs';\nimport { hasModifierKey, A, Z, ZERO, NINE, END, HOME, LEFT_ARROW, RIGHT_ARROW, UP_ARROW, DOWN_ARROW, TAB } from '@angular/cdk/keycodes';\nimport { tap, debounceTime, filter, map, take } from 'rxjs/operators';\nimport { coerceBooleanProperty, coerceElement } from '@angular/cdk/coercion';\nimport { Platform, normalizePassiveListenerOptions, _getShadowRoot, PlatformModule } from '@angular/cdk/platform';\nimport { ContentObserver, ObserversModule } from '@angular/cdk/observers';\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/** IDs are delimited by an empty space, as per the spec. */\nimport * as ɵngcc0 from '@angular/core';\nimport * as ɵngcc1 from '@angular/cdk/platform';\nimport * as ɵngcc2 from '@angular/cdk/observers';\nconst ID_DELIMITER = ' ';\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 */\nfunction addAriaReferencedId(el, attr, id) {\n const ids = getAriaReferenceIds(el, attr);\n if (ids.some(existingId => existingId.trim() == id.trim())) {\n return;\n }\n ids.push(id.trim());\n el.setAttribute(attr, ids.join(ID_DELIMITER));\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 */\nfunction removeAriaReferencedId(el, attr, id) {\n const ids = getAriaReferenceIds(el, attr);\n const filteredIds = ids.filter(val => val != id.trim());\n if (filteredIds.length) {\n el.setAttribute(attr, filteredIds.join(ID_DELIMITER));\n }\n else {\n el.removeAttribute(attr);\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 */\nfunction getAriaReferenceIds(el, attr) {\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/**\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/** ID used for the body container where all messages are appended. */\nconst MESSAGES_CONTAINER_ID = 'cdk-describedby-message-container';\n/** ID prefix used for each created message element. */\nconst CDK_DESCRIBEDBY_ID_PREFIX = 'cdk-describedby-message';\n/** Attribute given to each host element that is described by a message element. */\nconst CDK_DESCRIBEDBY_HOST_ATTRIBUTE = 'cdk-describedby-host';\n/** Global incremental identifier for each registered message element. */\nlet nextId = 0;\n/** Global map of all registered message elements that have been placed into the document. */\nconst messageRegistry = new Map();\n/** Container for all registered messages. */\nlet messagesContainer = null;\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 */\nclass AriaDescriber {\n constructor(_document) {\n this._document = _document;\n }\n describe(hostElement, message, role) {\n if (!this._canBeDescribed(hostElement, message)) {\n return;\n }\n const key = getKey(message, role);\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 }\n else if (!messageRegistry.has(key)) {\n this._createMessageElement(message, role);\n }\n if (!this._isElementDescribedByMessage(hostElement, key)) {\n this._addMessageReference(hostElement, key);\n }\n }\n removeDescription(hostElement, message, role) {\n if (!message || !this._isElementNode(hostElement)) {\n return;\n }\n const key = getKey(message, role);\n if (this._isElementDescribedByMessage(hostElement, key)) {\n this._removeMessageReference(hostElement, key);\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 if (messagesContainer && messagesContainer.childNodes.length === 0) {\n this._deleteMessagesContainer();\n }\n }\n /** Unregisters all created message elements and removes the message container. */\n ngOnDestroy() {\n const describedElements = this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}]`);\n for (let i = 0; i < describedElements.length; i++) {\n this._removeCdkDescribedByReferenceIds(describedElements[i]);\n describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n }\n if (messagesContainer) {\n this._deleteMessagesContainer();\n }\n messageRegistry.clear();\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 _createMessageElement(message, role) {\n const messageElement = this._document.createElement('div');\n setMessageId(messageElement);\n messageElement.textContent = message;\n if (role) {\n messageElement.setAttribute('role', role);\n }\n this._createMessagesContainer();\n messagesContainer.appendChild(messageElement);\n messageRegistry.set(getKey(message, role), { messageElement, referenceCount: 0 });\n }\n /** Deletes the message element from the global messages container. */\n _deleteMessageElement(key) {\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 /** Creates the global container for all aria-describedby messages. */\n _createMessagesContainer() {\n if (!messagesContainer) {\n const preExistingContainer = this._document.getElementById(MESSAGES_CONTAINER_ID);\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 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 this._document.body.appendChild(messagesContainer);\n }\n }\n /** Deletes the global messages container. */\n _deleteMessagesContainer() {\n if (messagesContainer && messagesContainer.parentNode) {\n messagesContainer.parentNode.removeChild(messagesContainer);\n messagesContainer = null;\n }\n }\n /** Removes all cdk-describedby messages that are hosted through the element. */\n _removeCdkDescribedByReferenceIds(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 * Adds a message reference to the element using aria-describedby and increments the registered\n * message's reference count.\n */\n _addMessageReference(element, key) {\n const registeredMessage = messageRegistry.get(key);\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 * Removes a message reference from the element using aria-describedby\n * and decrements the registered message's reference count.\n */\n _removeMessageReference(element, key) {\n const registeredMessage = messageRegistry.get(key);\n registeredMessage.referenceCount--;\n removeAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id);\n element.removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n }\n /** Returns true if the element has been described by the provided message ID. */\n _isElementDescribedByMessage(element, key) {\n const referenceIds = getAriaReferenceIds(element, 'aria-describedby');\n const registeredMessage = messageRegistry.get(key);\n const messageId = registeredMessage && registeredMessage.messageElement.id;\n return !!messageId && referenceIds.indexOf(messageId) != -1;\n }\n /** Determines whether a message can be described on a particular element. */\n _canBeDescribed(element, message) {\n if (!this._isElementNode(element)) {\n return false;\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 const trimmedMessage = message == null ? '' : `${message}`.trim();\n const ariaLabel = element.getAttribute('aria-label');\n // We shouldn't set descriptions if they're exactly the same as the `aria-label` of the\n // element, because screen readers will end up reading out the same text twice in a row.\n return trimmedMessage ? (!ariaLabel || ariaLabel.trim() !== trimmedMessage) : false;\n }\n /** Checks whether a node is an Element node. */\n _isElementNode(element) {\n return element.nodeType === this._document.ELEMENT_NODE;\n }\n}\nAriaDescriber.ɵfac = function AriaDescriber_Factory(t) { return new (t || AriaDescriber)(ɵngcc0.ɵɵinject(DOCUMENT)); };\nAriaDescriber.ɵprov = ɵɵdefineInjectable({ factory: function AriaDescriber_Factory() { return new AriaDescriber(ɵɵinject(DOCUMENT)); }, token: AriaDescriber, providedIn: \"root\" });\nAriaDescriber.ctorParameters = () => [\n { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }\n];\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(AriaDescriber, [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], function () { return [{ type: undefined, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }]; }, null); })();\n/** Gets a key that can be used to look messages up in the registry. */\nfunction getKey(message, role) {\n return typeof message === 'string' ? `${role || ''}/${message}` : message;\n}\n/** Assigns a unique ID to an element, if it doesn't have one already. */\nfunction setMessageId(element) {\n if (!element.id) {\n element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${nextId++}`;\n }\n}\n\n/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n/**\n * 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 */\nclass ListKeyManager {\n constructor(_items) {\n this._items = _items;\n this._activeItemIndex = -1;\n this._activeItem = null;\n this._wrap = false;\n this._letterKeyStream = new Subject();\n this._typeaheadSubscription = Subscription.EMPTY;\n this._vertical = true;\n this._allowedModifierKeys = [];\n this._homeAndEnd = false;\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 this._skipPredicateFn = (item) => item.disabled;\n // Buffer for the letters that the user has pressed when the typeahead option is turned on.\n this._pressedLetters = [];\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 this.tabOut = new Subject();\n /** Stream that emits whenever the active item of the list manager changes. */\n this.change = new Subject();\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) => {\n if (this._activeItem) {\n const itemArray = newItems.toArray();\n const newIndex = itemArray.indexOf(this._activeItem);\n if (newIndex > -1 && newIndex !== this._activeItemIndex) {\n this._activeItemIndex = newIndex;\n }\n }\n });\n }\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) {\n this._skipPredicateFn = predicate;\n return this;\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) {\n this._wrap = shouldWrap;\n return this;\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 = true) {\n this._vertical = enabled;\n return this;\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) {\n this._horizontal = direction;\n return this;\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) {\n this._allowedModifierKeys = keys;\n return this;\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 = 200) {\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 this._typeaheadSubscription.unsubscribe();\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(tap(letter => this._pressedLetters.push(letter)), debounceTime(debounceInterval), filter(() => this._pressedLetters.length > 0), map(() => this._pressedLetters.join(''))).subscribe(inputString => {\n const items = this._getItemsArray();\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 if (!this._skipPredicateFn(item) &&\n item.getLabel().toUpperCase().trim().indexOf(inputString) === 0) {\n this.setActiveItem(index);\n break;\n }\n }\n this._pressedLetters = [];\n });\n return this;\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 = true) {\n this._homeAndEnd = enabled;\n return this;\n }\n setActiveItem(item) {\n const previousActiveItem = this._activeItem;\n this.updateActiveItem(item);\n if (this._activeItem !== previousActiveItem) {\n this.change.next(this._activeItemIndex);\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) {\n const keyCode = event.keyCode;\n const modifiers = ['altKey', 'ctrlKey', 'metaKey', 'shiftKey'];\n const isModifierAllowed = modifiers.every(modifier => {\n return !event[modifier] || this._allowedModifierKeys.indexOf(modifier) > -1;\n });\n switch (keyCode) {\n case TAB:\n this.tabOut.next();\n return;\n case DOWN_ARROW:\n if (this._vertical && isModifierAllowed) {\n this.setNextItemActive();\n break;\n }\n else {\n return;\n }\n case UP_ARROW:\n if (this._vertical && isModifierAllowed) {\n this.setPreviousItemActive();\n break;\n }\n else {\n return;\n }\n case RIGHT_ARROW:\n if (this._horizontal && isModifierAllowed) {\n this._horizontal === 'rtl' ? this.setPreviousItemActive() : this.setNextItemActive();\n break;\n }\n else {\n return;\n }\n case LEFT_ARROW:\n if (this._horizontal && isModifierAllowed) {\n this._horizontal === 'rtl' ? this.setNextItemActive() : this.setPreviousItemActive();\n break;\n }\n else {\n return;\n }\n case HOME:\n if (this._homeAndEnd && isModifierAllowed) {\n this.setFirstItemActive();\n break;\n }\n else {\n return;\n }\n case END:\n if (this._homeAndEnd && isModifierAllowed) {\n this.setLastItemActive();\n break;\n }\n else {\n return;\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 }\n else if ((keyCode >= A && keyCode <= Z) || (keyCode >= ZERO && keyCode <= NINE)) {\n this._letterKeyStream.next(String.fromCharCode(keyCode));\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 this._pressedLetters = [];\n event.preventDefault();\n }\n /** Index of the currently active item. */\n get activeItemIndex() {\n return this._activeItemIndex;\n }\n /** The active item. */\n get activeItem() {\n return this._activeItem;\n }\n /** Gets whether the user is currently typing into the manager using the typeahead feature. */\n isTyping() {\n return this._pressedLetters.length > 0;\n }\n /** Sets the active item to the first enabled item in the list. */\n setFirstItemActive() {\n this._setActiveItemByIndex(0, 1);\n }\n /** Sets the active item to the last enabled item in the list. */\n setLastItemActive() {\n this._setActiveItemByIndex(this._items.length - 1, -1);\n }\n /** Sets the active item to the next enabled item in the list. */\n setNextItemActive() {\n this._activeItemIndex < 0 ? this.setFirstItemActive() : this._setActiveItemByDelta(1);\n }\n /** Sets the active item to a previous enabled item in the list. */\n setPreviousItemActive() {\n this._activeItemIndex < 0 && this._wrap ? this.setLastItemActive()\n : this._setActiveItemByDelta(-1);\n }\n updateActiveItem(item) {\n const itemArray = this._getItemsArray();\n const index = typeof item === 'number' ? item : itemArray.indexOf(item);\n const activeItem = itemArray[index];\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 * 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 _setActiveItemByDelta(delta) {\n this._wrap ? this._setActiveInWrapMode(delta) : this._setActiveInDefaultMode(delta);\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 _setActiveInWrapMode(delta) {\n const items = this._getItemsArray();\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 if (!this._skipPredicateFn(item)) {\n this.setActiveItem(index);\n return;\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 _setActiveInDefaultMode(delta) {\n this._setActiveItemByIndex(this._activeItemIndex + delta, delta);\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 _setActiveItemByIndex(index, fallbackDelta) {\n const items = this._getItemsArray();\n if (!items[index]) {\n return;\n }\n while (this._skipPredicateFn(items[index])) {\n index += fallbackDelta;\n if (!items[index]) {\n return;\n }\n }\n this.setActiveItem(index);\n }\n /** Returns the items as an array. */\n _getItemsArray() {\n return this._items instanceof QueryList ? this._items.toArray() : this._items;\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 */\nclass ActiveDescendantKeyManager extends ListKeyManager {\n setActiveItem(index) {\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 */\nclass FocusKeyManager extends ListKeyManager {\n constructor() {\n super(...arguments);\n this._origin = '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) {\n this._origin = origin;\n return this;\n }\n setActiveItem(item) {\n super.setActiveItem(item);\n if (this.activeItem) {\n this.activeItem.focus(this._origin);\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/**\n * Configuration for the isFocusable method.\n */\nclass IsFocusableConfig {\n constructor() {\n /**\n * Whether to count an element as focusable even if it is not currently visible.\n */\n this.ignoreVisibility = 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 * Utility for checking the interactivity of an element, such as whether is is focusable or\n * tabbable.\n */\nclass InteractivityChecker {\n constructor(_platform) {\n this._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) {\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 * 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) {\n return hasGeometry(element) && getComputedStyle(element).visibility === 'visible';\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) {\n // Nothing is tabbable on the server 😎\n if (!this._platform.isBrowser) {\n return false;\n }\n const frameElement = getFrameElement(getWindow(element));\n if (frameElement) {\n // Frame elements inherit their tabindex onto all child elements.\n if (getTabIndexValue(frameElement) === -1) {\n return false;\n }\n // Browsers disable tabbing to an element inside of an invisible frame.\n if (!this.isVisible(frameElement)) {\n return false;\n }\n }\n let nodeName = element.nodeName.toLowerCase();\n let tabIndexValue = getTabIndexValue(element);\n if (element.hasAttribute('contenteditable')) {\n return tabIndexValue !== -1;\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 // 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 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 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 return element.tabIndex >= 0;\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, config) {\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 === null || config === void 0 ? void 0 : config.ignoreVisibility) || this.isVisible(element));\n }\n}\nInteractivityChecker.ɵfac = function InteractivityChecker_Factory(t) { return new (t || InteractivityChecker)(ɵngcc0.ɵɵinject(ɵngcc1.Platform)); };\nInteractivityChecker.ɵprov = ɵɵdefineInjectable({ factory: function InteractivityChecker_Factory() { return new InteractivityChecker(ɵɵinject(Platform)); }, token: InteractivityChecker, providedIn: \"root\" });\nInteractivityChecker.ctorParameters = () => [\n { type: Platform }\n];\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(InteractivityChecker, [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], function () { return [{ type: ɵngcc1.Platform }]; }, null); })();\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) {\n try {\n return window.frameElement;\n }\n catch (_a) {\n return null;\n }\n}\n/** Checks whether the specified element has any geometry / rectangles. */\nfunction hasGeometry(element) {\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/** Gets whether an element's */\nfunction isNativeFormElement(element) {\n let nodeName = element.nodeName.toLowerCase();\n return nodeName === 'input' ||\n nodeName === 'select' ||\n nodeName === 'button' ||\n nodeName === 'textarea';\n}\n/** Gets whether an element is an `<input type=\"hidden\">`. */\nfunction isHiddenInput(element) {\n return isInputElement(element) && element.type == 'hidden';\n}\n/** Gets whether an element is an anchor that has an href attribute. */\nfunction isAnchorWithHref(element) {\n return isAnchorElement(element) && element.hasAttribute('href');\n}\n/** Gets whether an element is an input element. */\nfunction isInputElement(element) {\n return element.nodeName.toLowerCase() == 'input';\n}\n/** Gets whether an element is an anchor element. */\nfunction isAnchorElement(element) {\n return element.nodeName.toLowerCase() == 'a';\n}\n/** Gets whether an element has a valid tabindex. */\nfunction hasValidTabIndex(element) {\n if (!element.hasAttribute('tabindex') || element.tabIndex === undefined) {\n return false;\n }\n let tabIndex = element.getAttribute('tabindex');\n // IE11 parses tabindex=\"\" as the value \"-32768\"\n if (tabIndex == '-32768') {\n return false;\n }\n return !!(tabIndex && !isNaN(parseInt(tabIndex, 10)));\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) {\n if (!hasValidTabIndex(element)) {\n return null;\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 return isNaN(tabIndex) ? -1 : tabIndex;\n}\n/** Checks whether the specified element is potentially tabbable on iOS */\nfunction isPotentiallyTabbableIOS(element) {\n let nodeName = element.nodeName.toLowerCase();\n let inputType = nodeName === 'input' && element.type;\n return inputType === 'text'\n || inputType === 'password'\n || nodeName === 'select'\n || nodeName === 'textarea';\n}\n/**\n * Gets whether an element is potentially focusable without taking current visible/disabled state\n * into account.\n */\nfunction isPotentiallyFocusable(element) {\n // Inputs are potentially focusable *unless* they're type=\"hidden\".\n if (isHiddenInput(element)) {\n return false;\n }\n return isNativeFormElement(element) ||\n isAnchorWithHref(element) ||\n element.hasAttribute('contenteditable') ||\n hasValidTabIndex(element);\n}\n/** Gets the parent window of a DOM node with regards of being inside of an iframe. */\nfunction getWindow(node) {\n // ownerDocument is null if `node` itself *is* a document.\n return node.ownerDocument && node.ownerDocument.defaultView || window;\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 * 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 */\nclass FocusTrap {\n constructor(_element, _checker, _ngZone, _document, deferAnchors = false) {\n this._element = _element;\n this._checker = _checker;\n this._ngZone = _ngZone;\n this._document = _document;\n this._hasAttached = false;\n // Event listeners for the anchors. Need to be regular functions so that we can unbind them later.\n this.startAnchorListener = () => this.focusLastTabbableElement();\n this.endAnchorListener = () => this.focusFirstTabbableElement();\n this._enabled = true;\n if (!deferAnchors) {\n this.attachAnchors();\n }\n }\n /** Whether the focus trap is active. */\n get enabled() { return this._enabled; }\n set enabled(value) {\n this._enabled = value;\n if (this._startAnchor && this._endAnchor) {\n this._toggleAnchorTabIndex(value, this._startAnchor);\n this._toggleAnchorTabIndex(value, this._endAnchor);\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 if (startAnchor) {\n startAnchor.removeEventListener('focus', this.startAnchorListener);\n if (startAnchor.parentNode) {\n startAnchor.parentNode.removeChild(startAnchor);\n }\n }\n if (endAnchor) {\n endAnchor.removeEventListener('focus', this.endAnchorListener);\n if (endAnchor.parentNode) {\n endAnchor.parentNode.removeChild(endAnchor);\n }\n }\n this._startAnchor = this._endAnchor = null;\n this._hasAttached = false;\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() {\n // If we're not on the browser, there can be no focus to trap.\n if (this._hasAttached) {\n return true;\n }\n this._ngZone.runOutsideAngular(() => {\n if (!this._startAnchor) {\n this._startAnchor = this._createAnchor();\n this._startAnchor.addEventListener('focus', this.startAnchorListener);\n }\n if (!this._endAnchor) {\n this._endAnchor = this._createAnchor();\n this._endAnchor.addEventListener('focus', this.endAnchorListener);\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 return this._hasAttached;\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() {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusInitialElement()));\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() {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusFirstTabbableElement()));\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() {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusLastTabbableElement()));\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 _getRegionBoundary(bound) {\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}]`);\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${bound}' instead. The deprecated ` +\n `attribute will be removed in 8.0.0.`, markers[i]);\n }\n else if (markers[i].hasAttribute(`cdk-focus-region-${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 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 * Focuses the element that should be focused when the focus trap is initialized.\n * @returns Whether focus was moved successfully.\n */\n focusInitialElement() {\n // Contains the deprecated version of selector, for temporary backwards comparability.\n const redirectToElement = this._element.querySelector(`[cdk-focus-initial], ` +\n `[cdkFocusInitial]`);\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 // 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 if (!this._checker.isFocusable(redirectToElement)) {\n const focusableChild = this._getFirstTabbableElement(redirectToElement);\n focusableChild === null || focusableChild === void 0 ? void 0 : focusableChild.focus();\n return !!focusableChild;\n }\n redirectToElement.focus();\n return true;\n }\n return this.focusFirstTabbableElement();\n }\n /**\n * Focuses the first tabbable element within the focus trap region.\n * @returns Whether focus was moved successfully.\n */\n focusFirstTabbableElement() {\n const redirectToElement = this._getRegionBoundary('start');\n if (redirectToElement) {\n redirectToElement.focus();\n }\n return !!redirectToElement;\n }\n /**\n * Focuses the last tabbable element within the focus trap region.\n * @returns Whether focus was moved successfully.\n */\n focusLastTabbableElement() {\n const redirectToElement = this._getRegionBoundary('end');\n if (redirectToElement) {\n redirectToElement.focus();\n }\n return !!redirectToElement;\n }\n /**\n * Checks whether the focus trap has successfully been attached.\n */\n hasAttached() {\n return this._hasAttached;\n }\n /** Get the first tabbable element from a DOM subtree (inclusive). */\n _getFirstTabbableElement(root) {\n if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {\n return root;\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 for (let i = 0; i < children.length; i++) {\n let tabbableChild = children[i].nodeType === this._document.ELEMENT_NODE ?\n this._getFirstTabbableElement(children[i]) :\n null;\n if (tabbableChild) {\n return tabbableChild;\n }\n }\n return null;\n }\n /** Get the last tabbable element from a DOM subtree (inclusive). */\n _getLastTabbableElement(root) {\n if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {\n return root;\n }\n // Iterate in reverse DOM order.\n let children = root.children || root.childNodes;\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]) :\n null;\n if (tabbableChild) {\n return tabbableChild;\n }\n }\n return null;\n }\n /** Creates an anchor element. */\n _createAnchor() {\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 * 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 _toggleAnchorTabIndex(isEnabled, anchor) {\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 * 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 toggleAnchors(enabled) {\n if (this._startAnchor && this._endAnchor) {\n this._toggleAnchorTabIndex(enabled, this._startAnchor);\n this._toggleAnchorTabIndex(enabled, this._endAnchor);\n }\n }\n /** Executes a function when the zone is stable. */\n _executeOnStable(fn) {\n if (this._ngZone.isStable) {\n fn();\n }\n else {\n this._ngZone.onStable.pipe(take(1)).subscribe(fn);\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 */\nclass FocusTrapFactory {\n constructor(_checker, _ngZone, _document) {\n this._checker = _checker;\n this._ngZone = _ngZone;\n this._document = _document;\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, deferCaptureElements = false) {\n return new FocusTrap(element, this._checker, this._ngZone, this._document, deferCaptureElements);\n }\n}\nFocusTrapFactory.ɵfac = function FocusTrapFactory_Factory(t) { return new (t || FocusTrapFactory)(ɵngcc0.ɵɵinject(InteractivityChecker), ɵngcc0.ɵɵinject(ɵngcc0.NgZone), ɵngcc0.ɵɵinject(DOCUMENT)); };\nFocusTrapFactory.ɵprov = ɵɵdefineInjectable({ factory: function FocusTrapFactory_Factory() { return new FocusTrapFactory(ɵɵinject(InteractivityChecker), ɵɵinject(NgZone), ɵɵinject(DOCUMENT)); }, token: FocusTrapFactory, providedIn: \"root\" });\nFocusTrapFactory.ctorParameters = () => [\n { type: InteractivityChecker },\n { type: NgZone },\n { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }\n];\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(FocusTrapFactory, [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], function () { return [{ type: InteractivityChecker }, { type: ɵngcc0.NgZone }, { type: undefined, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }]; }, null); })();\n/** Directive for trapping focus within a region. */\nclass CdkTrapFocus {\n constructor(_elementRef, _focusTrapFactory, _document) {\n this._elementRef = _elementRef;\n this._focusTrapFactory = _focusTrapFactory;\n /** Previously focused element to restore focus to upon destroy when using autoCapture. */\n this._previouslyFocusedElement = null;\n this._document = _document;\n this.focusTrap = this._focusTrapFactory.create(this._elementRef.nativeElement, true);\n }\n /** Whether the focus trap is active. */\n get enabled() { return this.focusTrap.enabled; }\n set enabled(value) { this.focusTrap.enabled = coerceBooleanProperty(value); }\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 get autoCapture() { return this._autoCapture; }\n set autoCapture(value) { this._autoCapture = coerceBooleanProperty(value); }\n ngOnDestroy() {\n this.focusTrap.destroy();\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 ngAfterContentInit() {\n this.focusTrap.attachAnchors();\n if (this.autoCapture) {\n this._captureFocus();\n }\n }\n ngDoCheck() {\n if (!this.focusTrap.hasAttached()) {\n this.focusTrap.attachAnchors();\n }\n }\n ngOnChanges(changes) {\n const autoCaptureChange = changes['autoCapture'];\n if (autoCaptureChange && !autoCaptureChange.firstChange && this.autoCapture &&\n this.focusTrap.hasAttached()) {\n this._captureFocus();\n }\n }\n _captureFocus() {\n var _a, _b;\n // If the `activeElement` is inside a shadow root, `document.activeElement` will\n // point to the shadow root so we have to descend into it ourselves.\n const activeElement = (_a = this._document) === null || _a === void 0 ? void 0 : _a.activeElement;\n this._previouslyFocusedElement =\n ((_b = activeElement === null || activeElement === void 0 ? void 0 : activeElement.shadowRoot) === null || _b === void 0 ? void 0 : _b.activeElement) || activeElement;\n this.focusTrap.focusInitialElementWhenReady();\n }\n}\nCdkTrapFocus.ɵfac = function CdkTrapFocus_Factory(t) { return new (t || CdkTrapFocus)(ɵngcc0.ɵɵdirectiveInject(ɵngcc0.ElementRef), ɵngcc0.ɵɵdirectiveInject(FocusTrapFactory), ɵngcc0.ɵɵdirectiveInject(DOCUMENT)); };\nCdkTrapFocus.ɵdir = /*@__PURE__*/ ɵngcc0.ɵɵdefineDirective({ type: CdkTrapFocus, selectors: [[\"\", \"cdkTrapFocus\", \"\"]], inputs: { enabled: [\"cdkTrapFocus\", \"enabled\"], autoCapture: [\"cdkTrapFocusAutoCapture\", \"autoCapture\"] }, exportAs: [\"cdkTrapFocus\"], features: [ɵngcc0.ɵɵNgOnChangesFeature] });\nCdkTrapFocus.ctorParameters = () => [\n { type: ElementRef },\n { type: FocusTrapFactory },\n { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }\n];\nCdkTrapFocus.propDecorators = {\n enabled: [{ type: Input, args: ['cdkTrapFocus',] }],\n autoCapture: [{ type: Input, args: ['cdkTrapFocusAutoCapture',] }]\n};\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(CdkTrapFocus, [{\n type: Directive,\n args: [{\n selector: '[cdkTrapFocus]',\n exportAs: 'cdkTrapFocus'\n }]\n }], function () { return [{ type: ɵngcc0.ElementRef }, { type: FocusTrapFactory }, { type: undefined, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }]; }, { enabled: [{\n type: Input,\n args: ['cdkTrapFocus']\n }], autoCapture: [{\n type: Input,\n args: ['cdkTrapFocusAutoCapture']\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 * 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 */\nclass ConfigurableFocusTrap extends FocusTrap {\n constructor(_element, _checker, _ngZone, _document, _focusTrapManager, _inertStrategy, config) {\n super(_element, _checker, _ngZone, _document, config.defer);\n this._focusTrapManager = _focusTrapManager;\n this._inertStrategy = _inertStrategy;\n this._focusTrapManager.register(this);\n }\n /** Whether the FocusTrap is enabled. */\n get enabled() { return this._enabled; }\n set enabled(value) {\n this._enabled = value;\n if (this._enabled) {\n this._focusTrapManager.register(this);\n }\n else {\n this._focusTrapManager.deregister(this);\n }\n }\n /** Notifies the FocusTrapManager that this FocusTrap will be destroyed. */\n destroy() {\n this._focusTrapManager.deregister(this);\n super.destroy();\n }\n /** @docs-private Implemented as part of ManagedFocusTrap. */\n _enable() {\n this._inertStrategy.preventFocus(this);\n this.toggleAnchors(true);\n }\n /** @docs-private Implemented as part of ManagedFocusTrap. */\n _disable() {\n this._inertStrategy.allowFocus(this);\n this.toggleAnchors(false);\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/** IE 11 compatible closest implementation that is able to start from non-Element Nodes. */\nfunction closest(element, selector) {\n if (!(element instanceof Node)) {\n return null;\n }\n let curr = element;\n while (curr != null && !(curr instanceof Element)) {\n curr = curr.parentNode;\n }\n return curr && (hasNativeClosest ?\n curr.closest(selector) : polyfillClosest(curr, selector));\n}\n/** Polyfill for browsers without Element.closest. */\nfunction polyfillClosest(element, selector) {\n let curr = element;\n while (curr != null && !(curr instanceof Element && matches(curr, selector))) {\n curr = curr.parentNode;\n }\n return (curr || null);\n}\nconst hasNativeClosest = typeof Element != 'undefined' && !!Element.prototype.closest;\n/** IE 11 compatible matches implementation. */\nfunction matches(element, selector) {\n return element.matches ?\n element.matches(selector) :\n element['msMatchesSelector'](selector);\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 * Lightweight FocusTrapInertStrategy that adds a document focus event\n * listener to redirect focus back inside the FocusTrap.\n */\nclass EventListenerFocusTrapInertStrategy {\n constructor() {\n /** Focus event handler. */\n this._listener = null;\n }\n /** Adds a document event listener that keeps focus inside the FocusTrap. */\n preventFocus(focusTrap) {\n // Ensure there's only one listener per document\n if (this._listener) {\n focusTrap._document.removeEventListener('focus', this._listener, true);\n }\n this._listener = (e) => this._trapFocus(focusTrap, e);\n focusTrap._ngZone.runOutsideAngular(() => {\n focusTrap._document.addEventListener('focus', this._listener, true);\n });\n }\n /** Removes the event listener added in preventFocus. */\n allowFocus(focusTrap) {\n if (!this._listener) {\n return;\n }\n focusTrap._document.removeEventListener('focus', this._listener, true);\n this._listener = null;\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 _trapFocus(focusTrap, event) {\n const target = event.target;\n const focusTrapRoot = focusTrap._element;\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/**\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 * Configuration for creating a ConfigurableFocusTrap.\n */\nclass ConfigurableFocusTrapConfig {\n constructor() {\n /**\n * Whether to defer the creation of FocusTrap elements to be\n * done manually by the user. Default is to create them\n * automatically.\n */\n this.defer = false;\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/** The injection token used to specify the inert strategy. */\nconst FOCUS_TRAP_INERT_STRATEGY = new InjectionToken('FOCUS_TRAP_INERT_STRATEGY');\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/** Injectable that ensures only the most recently enabled FocusTrap is active. */\nclass FocusTrapManager {\n constructor() {\n // A stack of the FocusTraps on the page. Only the FocusTrap at the\n // top of the stack is active.\n this._focusTrapStack = [];\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) {\n // Dedupe focusTraps that register multiple times.\n this._focusTrapStack = this._focusTrapStack.filter((ft) => ft !== focusTrap);\n let stack = this._focusTrapStack;\n if (stack.length) {\n stack[stack.length - 1]._disable();\n }\n stack.push(focusTrap);\n focusTrap._enable();\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) {\n focusTrap._disable();\n const stack = this._focusTrapStack;\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}\nFocusTrapManager.ɵfac = function FocusTrapManager_Factory(t) { return new (t || FocusTrapManager)(); };\nFocusTrapManager.ɵprov = ɵɵdefineInjectable({ factory: function FocusTrapManager_Factory() { return new FocusTrapManager(); }, token: FocusTrapManager, providedIn: \"root\" });\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(FocusTrapManager, [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], function () { return []; }, null); })();\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/** Factory that allows easy instantiation of configurable focus traps. */\nclass ConfigurableFocusTrapFactory {\n constructor(_checker, _ngZone, _focusTrapManager, _document, _inertStrategy) {\n this._checker = _checker;\n this._ngZone = _ngZone;\n this._focusTrapManager = _focusTrapManager;\n this._document = _document;\n // TODO split up the strategies into different modules, similar to DateAdapter.\n this._inertStrategy = _inertStrategy || new EventListenerFocusTrapInertStrategy();\n }\n create(element, config = new ConfigurableFocusTrapConfig()) {\n let configObject;\n if (typeof config === 'boolean') {\n configObject = new ConfigurableFocusTrapConfig();\n configObject.defer = config;\n }\n else {\n configObject = config;\n }\n return new ConfigurableFocusTrap(element, this._checker, this._ngZone, this._document, this._focusTrapManager, this._inertStrategy, configObject);\n }\n}\nConfigurableFocusTrapFactory.ɵfac = function ConfigurableFocusTrapFactory_Factory(t) { return new (t || ConfigurableFocusTrapFactory)(ɵngcc0.ɵɵinject(InteractivityChecker), ɵngcc0.ɵɵinject(ɵngcc0.NgZone), ɵngcc0.ɵɵinject(FocusTrapManager), ɵngcc0.ɵɵinject(DOCUMENT), ɵngcc0.ɵɵinject(FOCUS_TRAP_INERT_STRATEGY, 8)); };\nConfigurableFocusTrapFactory.ɵprov = ɵɵdefineInjectable({ factory: function ConfigurableFocusTrapFactory_Factory() { return new ConfigurableFocusTrapFactory(ɵɵinject(InteractivityChecker), ɵɵinject(NgZone), ɵɵinject(FocusTrapManager), ɵɵinject(DOCUMENT), ɵɵinject(FOCUS_TRAP_INERT_STRATEGY, 8)); }, token: ConfigurableFocusTrapFactory, providedIn: \"root\" });\nConfigurableFocusTrapFactory.ctorParameters = () => [\n { type: InteractivityChecker },\n { type: NgZone },\n { type: FocusTrapManager },\n { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },\n { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [FOCUS_TRAP_INERT_STRATEGY,] }] }\n];\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(ConfigurableFocusTrapFactory, [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], function () { return [{ type: InteractivityChecker }, { type: ɵngcc0.NgZone }, { type: FocusTrapManager }, { type: undefined, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }, { type: undefined, decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [FOCUS_TRAP_INERT_STRATEGY]\n }] }]; }, null); })();\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 */\nconst LIVE_ANNOUNCER_ELEMENT_TOKEN = new InjectionToken('liveAnnouncerElement', {\n providedIn: 'root',\n factory: LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY,\n});\n/** @docs-private */\nfunction LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY() {\n return null;\n}\n/** Injection token that can be used to configure the default options for the LiveAnnouncer. */\nconst LIVE_ANNOUNCER_DEFAULT_OPTIONS = new InjectionToken('LIVE_ANNOUNCER_DEFAULT_OPTIONS');\n\n/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nclass LiveAnnouncer {\n constructor(elementToken, _ngZone, _document, _defaultOptions) {\n this._ngZone = _ngZone;\n this._defaultOptions = _defaultOptions;\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 announce(message, ...args) {\n const defaultOptions = this._defaultOptions;\n let politeness;\n let duration;\n if (args.length === 1 && typeof args[0] === 'number') {\n duration = args[0];\n }\n else {\n [politeness, duration] = args;\n }\n this.clear();\n clearTimeout(this._previousTimeout);\n if (!politeness) {\n politeness =\n (defaultOptions && defaultOptions.politeness) ? defaultOptions.politeness : 'polite';\n }\n if (duration == null && defaultOptions) {\n duration = defaultOptions.duration;\n }\n // TODO: ensure changing the politeness works on all environments we support.\n this._liveElement.setAttribute('aria-live', politeness);\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 if (typeof duration === 'number') {\n this._previousTimeout = setTimeout(() => this.clear(), duration);\n }\n }, 100);\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 ngOnDestroy() {\n clearTimeout(this._previousTimeout);\n if (this._liveElement && this._liveElement.parentNode) {\n this._liveElement.parentNode.removeChild(this._liveElement);\n this._liveElement = null;\n }\n }\n _createLiveElement() {\n const elementClass = 'cdk-live-announcer-element';\n const previousElements = this._document.getElementsByClassName(elementClass);\n const liveEl = this._document.createElement('div');\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 liveEl.classList.add(elementClass);\n liveEl.classList.add('cdk-visually-hidden');\n liveEl.setAttribute('aria-atomic', 'true');\n liveEl.setAttribute('aria-live', 'polite');\n this._document.body.appendChild(liveEl);\n return liveEl;\n }\n}\nLiveAnnouncer.ɵfac = function LiveAnnouncer_Factory(t) { return new (t || LiveAnnouncer)(ɵngcc0.ɵɵinject(LIVE_ANNOUNCER_ELEMENT_TOKEN, 8), ɵngcc0.ɵɵinject(ɵngcc0.NgZone), ɵngcc0.ɵɵinject(DOCUMENT), ɵngcc0.ɵɵinject(LIVE_ANNOUNCER_DEFAULT_OPTIONS, 8)); };\nLiveAnnouncer.ɵprov = ɵɵdefineInjectable({ factory: function LiveAnnouncer_Factory() { return new LiveAnnouncer(ɵɵinject(LIVE_ANNOUNCER_ELEMENT_TOKEN, 8), ɵɵinject(NgZone), ɵɵinject(DOCUMENT), ɵɵinject(LIVE_ANNOUNCER_DEFAULT_OPTIONS, 8)); }, token: LiveAnnouncer, providedIn: \"root\" });\nLiveAnnouncer.ctorParameters = () => [\n { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [LIVE_ANNOUNCER_ELEMENT_TOKEN,] }] },\n { type: NgZone },\n { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },\n { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [LIVE_ANNOUNCER_DEFAULT_OPTIONS,] }] }\n];\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(LiveAnnouncer, [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], function () { return [{ type: undefined, decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [LIVE_ANNOUNCER_ELEMENT_TOKEN]\n }] }, { type: ɵngcc0.NgZone }, { type: undefined, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }, { type: undefined, decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [LIVE_ANNOUNCER_DEFAULT_OPTIONS]\n }] }]; }, null); })();\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 */\nclass CdkAriaLive {\n constructor(_elementRef, _liveAnnouncer, _contentObserver, _ngZone) {\n this._elementRef = _elementRef;\n this._liveAnnouncer = _liveAnnouncer;\n this._contentObserver = _contentObserver;\n this._ngZone = _ngZone;\n this._politeness = 'polite';\n }\n /** The aria-live politeness level to use when announcing messages. */\n get politeness() { return this._politeness; }\n set politeness(value) {\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 }\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 // 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 ngOnDestroy() {\n if (this._subscription) {\n this._subscription.unsubscribe();\n }\n }\n}\nCdkAriaLive.ɵfac = function CdkAriaLive_Factory(t) { return new (t || CdkAriaLive)(ɵngcc0.ɵɵdirectiveInject(ɵngcc0.ElementRef), ɵngcc0.ɵɵdirectiveInject(LiveAnnouncer), ɵngcc0.ɵɵdirectiveInject(ɵngcc2.ContentObserver), ɵngcc0.ɵɵdirectiveInject(ɵngcc0.NgZone)); };\nCdkAriaLive.ɵdir = /*@__PURE__*/ ɵngcc0.ɵɵdefineDirective({ type: CdkAriaLive, selectors: [[\"\", \"cdkAriaLive\", \"\"]], inputs: { politeness: [\"cdkAriaLive\", \"politeness\"] }, exportAs: [\"cdkAriaLive\"] });\nCdkAriaLive.ctorParameters = () => [\n { type: ElementRef },\n { type: LiveAnnouncer },\n { type: ContentObserver },\n { type: NgZone }\n];\nCdkAriaLive.propDecorators = {\n politeness: [{ type: Input, args: ['cdkAriaLive',] }]\n};\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(CdkAriaLive, [{\n type: Directive,\n args: [{\n selector: '[cdkAriaLive]',\n exportAs: 'cdkAriaLive'\n }]\n }], function () { return [{ type: ɵngcc0.ElementRef }, { type: LiveAnnouncer }, { type: ɵngcc2.ContentObserver }, { type: ɵngcc0.NgZone }]; }, { politeness: [{\n type: Input,\n args: ['cdkAriaLive']\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/** Gets whether an event could be a faked `mousedown` event dispatched by a screen reader. */\nfunction isFakeMousedownFromScreenReader(event) {\n // We can typically distinguish between these faked mousedown events and real mousedown events\n // using the \"buttons\" property. While real mousedowns will indicate the mouse button that was\n // pressed (e.g. \"1\" for the left mouse button), faked mousedowns will usually set the property\n // value to 0.\n return event.buttons === 0;\n}\n/** Gets whether an event could be a faked `touchstart` event dispatched by a screen reader. */\nfunction isFakeTouchstartFromScreenReader(event) {\n const touch = (event.touches && event.touches[0]) ||\n (event.changedTouches && event.changedTouches[0]);\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/**\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// 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.\nconst TOUCH_BUFFER_MS = 650;\n/** InjectionToken for FocusMonitorOptions. */\nconst FOCUS_MONITOR_DEFAULT_OPTIONS = new InjectionToken('cdk-focus-monitor-default-options');\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/** Monitors mouse and keyboard events to determine the cause of focus events. */\nclass FocusMonitor {\n constructor(_ngZone, _platform, \n /** @breaking-change 11.0.0 make document required */\n document, options) {\n this._ngZone = _ngZone;\n this._platform = _platform;\n /** The focus origin that the next focus event is a result of. */\n this._origin = null;\n /** Whether the window has just been focused. */\n this._windowFocused = false;\n /** Map of elements being monitored to their info. */\n this._elementInfo = new Map();\n /** The number of elements currently being monitored. */\n this._monitoredElementCount = 0;\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 this._rootNodeFocusListenerCount = new Map();\n /**\n * Event listener for `keydown` events on the document.\n * Needs to be an arrow function in order to preserve the context when it gets bound.\n */\n this._documentKeydownListener = () => {\n // On keydown record the origin and clear any touch event that may be in progress.\n this._lastTouchTarget = null;\n this._setOriginForCurrentEventQueue('keyboard');\n };\n /**\n * Event listener for `mousedown` events on the document.\n * Needs to be an arrow function in order to preserve the context when it gets bound.\n */\n this._documentMousedownListener = (event) => {\n // On mousedown record the origin only if there is not touch\n // target, since a mousedown can happen as a result of a touch event.\n if (!this._lastTouchTarget) {\n // In some cases screen readers fire fake `mousedown` events instead of `keydown`.\n // Resolve the focus source to `keyboard` if we detect one of them.\n const source = isFakeMousedownFromScreenReader(event) ? 'keyboard' : 'mouse';\n this._setOriginForCurrentEventQueue(source);\n }\n };\n /**\n * Event listener for `touchstart` events on the document.\n * Needs to be an arrow function in order to preserve the context when it gets bound.\n */\n this._documentTouchstartListener = (event) => {\n // Some screen readers will fire a fake `touchstart` event if an element is activated using\n // the keyboard while on a device with a touchsreen. Consider such events as keyboard focus.\n if (!isFakeTouchstartFromScreenReader(event)) {\n // When the touchstart event fires the focus event is not yet in the event queue. This means\n // we can't rely on the trick used above (setting timeout of 1ms). Instead we wait 650ms to\n // see if a focus happens.\n if (this._touchTimeoutId != null) {\n clearTimeout(this._touchTimeoutId);\n }\n this._lastTouchTarget = getTarget(event);\n this._touchTimeoutId = setTimeout(() => this._lastTouchTarget = null, TOUCH_BUFFER_MS);\n }\n else if (!this._lastTouchTarget) {\n this._setOriginForCurrentEventQueue('keyboard');\n }\n };\n /**\n * Event listener for `focus` events on the window.\n * Needs to be an arrow function in order to preserve the context when it gets bound.\n */\n this._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 * 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 this._rootNodeFocusAndBlurListener = (event) => {\n const target = getTarget(event);\n const handler = event.type === 'focus' ? this._onFocus : this._onBlur;\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, element);\n }\n };\n this._document = document;\n this._detectionMode = (options === null || options === void 0 ? void 0 : options.detectionMode) || 0 /* IMMEDIATE */;\n }\n monitor(element, checkChildren = false) {\n const nativeElement = coerceElement(element);\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 of(null);\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 // 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 return cachedInfo.subject;\n }\n // Create monitored element info.\n const info = {\n checkChildren: checkChildren,\n subject: new Subject(),\n rootNode\n };\n this._elementInfo.set(nativeElement, info);\n this._registerGlobalListeners(info);\n return info.subject;\n }\n stopMonitoring(element) {\n const nativeElement = coerceElement(element);\n const elementInfo = this._elementInfo.get(nativeElement);\n if (elementInfo) {\n elementInfo.subject.complete();\n this._setClasses(nativeElement);\n this._elementInfo.delete(nativeElement);\n this._removeGlobalListeners(elementInfo);\n }\n }\n focusVia(element, origin, options) {\n const nativeElement = coerceElement(element);\n const focusedElement = this._getDocument().activeElement;\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 }\n else {\n this._setOriginForCurrentEventQueue(origin);\n // `focus` isn't available on the server\n if (typeof nativeElement.focus === 'function') {\n nativeElement.focus(options);\n }\n }\n }\n ngOnDestroy() {\n this._elementInfo.forEach((_info, element) => this.stopMonitoring(element));\n }\n /** Access injected document if available or fallback to global document reference */\n _getDocument() {\n return this._document || document;\n }\n /** Use defaultView of injected document if available or fallback to global window reference */\n _getWindow() {\n const doc = this._getDocument();\n return doc.defaultView || window;\n }\n _toggleClass(element, className, shouldSet) {\n if (shouldSet) {\n element.classList.add(className);\n }\n else {\n element.classList.remove(className);\n }\n }\n _getFocusOrigin(event) {\n // If we couldn't detect a cause for the focus event, it's due to one of three reasons:\n // 1) The window has just regained focus, in which case we want to restore the focused state of\n // the element from before the window blurred.\n // 2) It was caused by a touch event, in which case we mark the origin as 'touch'.\n // 3) The element was programmatically focused, in which case we should mark the origin as\n // 'program'.\n if (this._origin) {\n return this._origin;\n }\n if (this._windowFocused && this._lastFocusOrigin) {\n return this._lastFocusOrigin;\n }\n else if (this._wasCausedByTouch(event)) {\n return 'touch';\n }\n else {\n return 'program';\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 _setClasses(element, origin) {\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 * Sets the origin and schedules an async function to clear it at the end of the event queue.\n * If the detection mode is 'eventual', the origin is never cleared.\n * @param origin The origin to set.\n */\n _setOriginForCurrentEventQueue(origin) {\n this._ngZone.runOutsideAngular(() => {\n this._origin = origin;\n if (this._detectionMode === 0 /* IMMEDIATE */) {\n // Sometimes the focus origin won't be valid in Firefox because Firefox seems to focus *one*\n // tick after the interaction event fired. To ensure the focus origin is always correct,\n // the focus origin will be determined at the beginning of the next tick.\n this._originTimeoutId = setTimeout(() => this._origin = null, 1);\n }\n });\n }\n /**\n * Checks whether the given focus event was caused by a touchstart event.\n * @param event The focus event to check.\n * @returns Whether the event was caused by a touch.\n */\n _wasCausedByTouch(event) {\n // Note(mmalerba): This implementation is not quite perfect, there is a small edge case.\n // Consider the following dom structure:\n //\n // <div #parent tabindex=\"0\" cdkFocusClasses>\n // <div #child (click)=\"#parent.focus()\"></div>\n // </div>\n //\n // If the user touches the #child element and the #parent is programmatically focused as a\n // result, this code will still consider it to have been caused by the touch event and will\n // apply the cdk-touch-focused class rather than the cdk-program-focused class. This is a\n // relatively small edge-case that can be worked around by using\n // focusVia(parentEl, 'program') to focus the parent element.\n //\n // If we decide that we absolutely must handle this case correctly, we can do so by listening\n // for the first focus event after the touchstart, and then the first blur event after that\n // focus event. When that blur event fires we know that whatever follows is not a result of the\n // touchstart.\n const focusTarget = getTarget(event);\n return this._lastTouchTarget instanceof Node && focusTarget instanceof Node &&\n (focusTarget === this._lastTouchTarget || focusTarget.contains(this._lastTouchTarget));\n }\n /**\n * Handles focus events on a registered element.\n * @param event The focus event.\n * @param element The monitored element.\n */\n _onFocus(event, element) {\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 // If we are not counting child-element-focus as focused, make sure that the event target is the\n // monitored element itself.\n const elementInfo = this._elementInfo.get(element);\n if (!elementInfo || (!elementInfo.checkChildren && element !== getTarget(event))) {\n return;\n }\n this._originChanged(element, this._getFocusOrigin(event), elementInfo);\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, element) {\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 if (!elementInfo || (elementInfo.checkChildren && event.relatedTarget instanceof Node &&\n element.contains(event.relatedTarget))) {\n return;\n }\n this._setClasses(element);\n this._emitOrigin(elementInfo.subject, null);\n }\n _emitOrigin(subject, origin) {\n this._ngZone.run(() => subject.next(origin));\n }\n _registerGlobalListeners(elementInfo) {\n if (!this._platform.isBrowser) {\n return;\n }\n const rootNode = elementInfo.rootNode;\n const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode) || 0;\n if (!rootNodeFocusListeners) {\n this._ngZone.runOutsideAngular(() => {\n rootNode.addEventListener('focus', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);\n rootNode.addEventListener('blur', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);\n });\n }\n this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners + 1);\n // Register global listeners when first element is monitored.\n if (++this._monitoredElementCount === 1) {\n // Note: we listen to events in the capture phase so we\n // can detect them even if the user stops propagation.\n this._ngZone.runOutsideAngular(() => {\n const document = this._getDocument();\n const window = this._getWindow();\n document.addEventListener('keydown', this._documentKeydownListener, captureEventListenerOptions);\n document.addEventListener('mousedown', this._documentMousedownListener, captureEventListenerOptions);\n document.addEventListener('touchstart', this._documentTouchstartListener, captureEventListenerOptions);\n window.addEventListener('focus', this._windowFocusListener);\n });\n }\n }\n _removeGlobalListeners(elementInfo) {\n const rootNode = elementInfo.rootNode;\n if (this._rootNodeFocusListenerCount.has(rootNode)) {\n const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode);\n if (rootNodeFocusListeners > 1) {\n this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners - 1);\n }\n else {\n rootNode.removeEventListener('focus', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);\n rootNode.removeEventListener('blur', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);\n this._rootNodeFocusListenerCount.delete(rootNode);\n }\n }\n // Unregister global listeners when last element is unmonitored.\n if (!--this._monitoredElementCount) {\n const document = this._getDocument();\n const window = this._getWindow();\n document.removeEventListener('keydown', this._documentKeydownListener, captureEventListenerOptions);\n document.removeEventListener('mousedown', this._documentMousedownListener, captureEventListenerOptions);\n document.removeEventListener('touchstart', this._documentTouchstartListener, captureEventListenerOptions);\n window.removeEventListener('focus', this._windowFocusListener);\n // Clear timeouts for all potentially pending timeouts to prevent the leaks.\n clearTimeout(this._windowFocusTimeoutId);\n clearTimeout(this._touchTimeoutId);\n clearTimeout(this._originTimeoutId);\n }\n }\n /** Updates all the state on an element once its focus origin has changed. */\n _originChanged(element, origin, elementInfo) {\n this._setClasses(element, origin);\n this._emitOrigin(elementInfo.subject, origin);\n this._lastFocusOrigin = origin;\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 _getClosestElementsInfo(element) {\n const results = [];\n this._elementInfo.forEach((info, currentElement) => {\n if (currentElement === element || (info.checkChildren && currentElement.contains(element))) {\n results.push([currentElement, info]);\n }\n });\n return results;\n }\n}\nFocusMonitor.ɵfac = function FocusMonitor_Factory(t) { return new (t || FocusMonitor)(ɵngcc0.ɵɵinject(ɵngcc0.NgZone), ɵngcc0.ɵɵinject(ɵngcc1.Platform), ɵngcc0.ɵɵinject(DOCUMENT, 8), ɵngcc0.ɵɵinject(FOCUS_MONITOR_DEFAULT_OPTIONS, 8)); };\nFocusMonitor.ɵprov = ɵɵdefineInjectable({ factory: function FocusMonitor_Factory() { return new FocusMonitor(ɵɵinject(NgZone), ɵɵinject(Platform), ɵɵinject(DOCUMENT, 8), ɵɵinject(FOCUS_MONITOR_DEFAULT_OPTIONS, 8)); }, token: FocusMonitor, providedIn: \"root\" });\nFocusMonitor.ctorParameters = () => [\n { type: NgZone },\n { type: Platform },\n { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] },\n { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [FOCUS_MONITOR_DEFAULT_OPTIONS,] }] }\n];\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(FocusMonitor, [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], function () { return [{ type: ɵngcc0.NgZone }, { type: ɵngcc1.Platform }, { type: undefined, decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [DOCUMENT]\n }] }, { type: undefined, decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [FOCUS_MONITOR_DEFAULT_OPTIONS]\n }] }]; }, null); })();\n/** Gets the target of an event, accounting for Shadow DOM. */\nfunction getTarget(event) {\n // If an event is bound outside the Shadow DOM, the `event.target` will\n // point to the shadow root so we have to use `composedPath` instead.\n return (event.composedPath ? event.composedPath()[0] : event.target);\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 */\nclass CdkMonitorFocus {\n constructor(_elementRef, _focusMonitor) {\n this._elementRef = _elementRef;\n this._focusMonitor = _focusMonitor;\n this.cdkFocusChange = new EventEmitter();\n }\n ngAfterViewInit() {\n const element = this._elementRef.nativeElement;\n this._monitorSubscription = this._focusMonitor.monitor(element, element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))\n .subscribe(origin => this.cdkFocusChange.emit(origin));\n }\n ngOnDestroy() {\n this._focusMonitor.stopMonitoring(this._elementRef);\n if (this._monitorSubscription) {\n this._monitorSubscription.unsubscribe();\n }\n }\n}\nCdkMonitorFocus.ɵfac = function CdkMonitorFocus_Factory(t) { return new (t || CdkMonitorFocus)(ɵngcc0.ɵɵdirectiveInject(ɵngcc0.ElementRef), ɵngcc0.ɵɵdirectiveInject(FocusMonitor)); };\nCdkMonitorFocus.ɵdir = /*@__PURE__*/ ɵngcc0.ɵɵdefineDirective({ type: CdkMonitorFocus, selectors: [[\"\", \"cdkMonitorElementFocus\", \"\"], [\"\", \"cdkMonitorSubtreeFocus\", \"\"]], outputs: { cdkFocusChange: \"cdkFocusChange\" } });\nCdkMonitorFocus.ctorParameters = () => [\n { type: ElementRef },\n { type: FocusMonitor }\n];\nCdkMonitorFocus.propDecorators = {\n cdkFocusChange: [{ type: Output }]\n};\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(CdkMonitorFocus, [{\n type: Directive,\n args: [{\n selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]'\n }]\n }], function () { return [{ type: ɵngcc0.ElementRef }, { type: FocusMonitor }]; }, { cdkFocusChange: [{\n type: Output\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/** CSS class applied to the document body when in black-on-white high-contrast mode. */\nconst BLACK_ON_WHITE_CSS_CLASS = 'cdk-high-contrast-black-on-white';\n/** CSS class applied to the document body when in white-on-black high-contrast mode. */\nconst WHITE_ON_BLACK_CSS_CLASS = 'cdk-high-contrast-white-on-black';\n/** CSS class applied to the document body when in high-contrast mode. */\nconst HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS = 'cdk-high-contrast-active';\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 */\nclass HighContrastModeDetector {\n constructor(_platform, document) {\n this._platform = _platform;\n this._document = document;\n }\n /** Gets the current high-contrast-mode for the page. */\n getHighContrastMode() {\n if (!this._platform.isBrowser) {\n return 0 /* NONE */;\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 // 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 = (computedStyle && computedStyle.backgroundColor || '').replace(/ /g, '');\n this._document.body.removeChild(testElement);\n switch (computedColor) {\n case 'rgb(0,0,0)': return 2 /* WHITE_ON_BLACK */;\n case 'rgb(255,255,255)': return 1 /* BLACK_ON_WHITE */;\n }\n return 0 /* NONE */;\n }\n /** Applies CSS classes indicating high-contrast mode to document body (browser-only). */\n _applyBodyHighContrastModeCssClasses() {\n if (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 const mode = this.getHighContrastMode();\n if (mode === 1 /* BLACK_ON_WHITE */) {\n bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);\n bodyClasses.add(BLACK_ON_WHITE_CSS_CLASS);\n }\n else if (mode === 2 /* WHITE_ON_BLACK */) {\n bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);\n bodyClasses.add(WHITE_ON_BLACK_CSS_CLASS);\n }\n }\n }\n}\nHighContrastModeDetector.ɵfac = function HighContrastModeDetector_Factory(t) { return new (t || HighContrastModeDetector)(ɵngcc0.ɵɵinject(ɵngcc1.Platform), ɵngcc0.ɵɵinject(DOCUMENT)); };\nHighContrastModeDetector.ɵprov = ɵɵdefineInjectable({ factory: function HighContrastModeDetector_Factory() { return new HighContrastModeDetector(ɵɵinject(Platform), ɵɵinject(DOCUMENT)); }, token: HighContrastModeDetector, providedIn: \"root\" });\nHighContrastModeDetector.ctorParameters = () => [\n { type: Platform },\n { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }\n];\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(HighContrastModeDetector, [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], function () { return [{ type: ɵngcc1.Platform }, { type: undefined, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }]; }, null); })();\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 */\nclass A11yModule {\n constructor(highContrastModeDetector) {\n highContrastModeDetector._applyBodyHighContrastModeCssClasses();\n }\n}\nA11yModule.ɵfac = function A11yModule_Factory(t) { return new (t || A11yModule)(ɵngcc0.ɵɵinject(HighContrastModeDetector)); };\nA11yModule.ɵmod = /*@__PURE__*/ ɵngcc0.ɵɵdefineNgModule({ type: A11yModule });\nA11yModule.ɵinj = /*@__PURE__*/ ɵngcc0.ɵɵdefineInjector({ imports: [PlatformModule, ObserversModule] });\nA11yModule.ctorParameters = () => [\n { type: HighContrastModeDetector }\n];\n(function () { (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(A11yModule, [{\n type: NgModule,\n args: [{\n imports: [PlatformModule, ObserversModule],\n declarations: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],\n exports: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus]\n }]\n }], function () { return [{ type: HighContrastModeDetector }]; }, null); })();\n(function () { (typeof ngJitMode === \"undefined\" || ngJitMode) && ɵngcc0.ɵɵsetNgModuleScope(A11yModule, { declarations: function () { return [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus]; }, imports: function () { return [PlatformModule, ObserversModule]; }, exports: function () { return [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus]; } }); })();\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 * Generated bundle index. Do not edit.\n */\n\nexport { A11yModule, ActiveDescendantKeyManager, AriaDescriber, CDK_DESCRIBEDBY_HOST_ATTRIBUTE, CDK_DESCRIBEDBY_ID_PREFIX, CdkAriaLive, CdkMonitorFocus, CdkTrapFocus, ConfigurableFocusTrap, ConfigurableFocusTrapFactory, EventListenerFocusTrapInertStrategy, FOCUS_MONITOR_DEFAULT_OPTIONS, FOCUS_TRAP_INERT_STRATEGY, FocusKeyManager, FocusMonitor, FocusTrap, FocusTrapFactory, HighContrastModeDetector, InteractivityChecker, IsFocusableConfig, LIVE_ANNOUNCER_DEFAULT_OPTIONS, LIVE_ANNOUNCER_ELEMENT_TOKEN, LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY, ListKeyManager, LiveAnnouncer, MESSAGES_CONTAINER_ID, TOUCH_BUFFER_MS, isFakeMousedownFromScreenReader, isFakeTouchstartFromScreenReader, FocusTrapManager as ɵangular_material_src_cdk_a11y_a11y_a, ConfigurableFocusTrapConfig as ɵangular_material_src_cdk_a11y_a11y_b 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