| 1 |
- {"ast":null,"code":"var _AriaDescriber, _InteractivityChecker, _FocusTrapFactory, _CdkTrapFocus, _FocusTrapManager, _ConfigurableFocusTrapFactory, _InputModalityDetector, _LiveAnnouncer, _CdkAriaLive, _FocusMonitor, _CdkMonitorFocus, _HighContrastModeDetector, _A11yModule;\nimport { DOCUMENT } from '@angular/common';\nimport * as i0 from '@angular/core';\nimport { inject, APP_ID, Injectable, Inject, signal, QueryList, isSignal, effect, InjectionToken, afterNextRender, Injector, booleanAttribute, Directive, Input, Optional, EventEmitter, Output, NgModule } from '@angular/core';\nimport * as i1 from '@angular/cdk/platform';\nimport { Platform, _getFocusedElementPierceShadowDom, normalizePassiveListenerOptions, _getEventTarget, _getShadowRoot } from '@angular/cdk/platform';\nimport { A, Z, ZERO, NINE, hasModifierKey, PAGE_DOWN, PAGE_UP, END, HOME, LEFT_ARROW, RIGHT_ARROW, UP_ARROW, DOWN_ARROW, TAB, ALT, CONTROL, MAC_META, META, SHIFT } from '@angular/cdk/keycodes';\nimport { Subject, Subscription, isObservable, of, BehaviorSubject } from 'rxjs';\nimport { tap, debounceTime, filter, map, take, skip, distinctUntilChanged, takeUntil } from 'rxjs/operators';\nimport { coerceObservable } from '@angular/cdk/coercion/private';\nimport * as i1$1 from '@angular/cdk/observers';\nimport { ObserversModule } from '@angular/cdk/observers';\nimport { coerceElement } from '@angular/cdk/coercion';\nimport { BreakpointObserver } from '@angular/cdk/layout';\n\n/** IDs are delimited by an empty space, as per the spec. */\nconst ID_DELIMITER = ' ';\n/**\n * Adds the given ID to the specified ARIA attribute on an element.\n * Used for attributes such as aria-labelledby, aria-owns, etc.\n */\nfunction addAriaReferencedId(el, attr, id) {\n const ids = getAriaReferenceIds(el, attr);\n id = id.trim();\n if (ids.some(existingId => existingId.trim() === id)) {\n return;\n }\n ids.push(id);\n el.setAttribute(attr, ids.join(ID_DELIMITER));\n}\n/**\n * Removes the given ID from the specified ARIA attribute on an element.\n * Used for attributes such as aria-labelledby, aria-owns, etc.\n */\nfunction removeAriaReferencedId(el, attr, id) {\n const ids = getAriaReferenceIds(el, attr);\n id = id.trim();\n const filteredIds = ids.filter(val => val !== id);\n if (filteredIds.length) {\n el.setAttribute(attr, filteredIds.join(ID_DELIMITER));\n } else {\n el.removeAttribute(attr);\n }\n}\n/**\n * Gets the list of IDs referenced by the given ARIA attribute on an element.\n * Used for attributes such as aria-labelledby, aria-owns, etc.\n */\nfunction getAriaReferenceIds(el, attr) {\n var _attrValue$match;\n // Get string array of all individual ids (whitespace delimited) in the attribute value\n const attrValue = el.getAttribute(attr);\n return (_attrValue$match = attrValue === null || attrValue === void 0 ? void 0 : attrValue.match(/\\S+/g)) !== null && _attrValue$match !== void 0 ? _attrValue$match : [];\n}\n\n/**\n * ID used for the body container where all messages are appended.\n * @deprecated No longer being used. To be removed.\n * @breaking-change 14.0.0\n */\nconst MESSAGES_CONTAINER_ID = 'cdk-describedby-message-container';\n/**\n * ID prefix used for each created message element.\n * @deprecated To be turned into a private variable.\n * @breaking-change 14.0.0\n */\nconst CDK_DESCRIBEDBY_ID_PREFIX = 'cdk-describedby-message';\n/**\n * Attribute given to each host element that is described by a message element.\n * @deprecated To be turned into a private variable.\n * @breaking-change 14.0.0\n */\nconst CDK_DESCRIBEDBY_HOST_ATTRIBUTE = 'cdk-describedby-host';\n/** Global incremental identifier for each registered message element. */\nlet nextId = 0;\n/**\n * Utility that creates visually hidden elements with a message content. Useful for elements that\n * want to use aria-describedby to further describe themselves without adding additional visual\n * content.\n */\nclass AriaDescriber {\n constructor(_document,\n /**\n * @deprecated To be turned into a required parameter.\n * @breaking-change 14.0.0\n */\n _platform) {\n this._platform = _platform;\n /** Map of all registered message elements that have been placed into the document. */\n this._messageRegistry = new Map();\n /** Container for all registered messages. */\n this._messagesContainer = null;\n /** Unique ID for the service. */\n this._id = `${nextId++}`;\n this._document = _document;\n this._id = inject(APP_ID) + '-' + nextId++;\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, this._id);\n this._messageRegistry.set(key, {\n messageElement: message,\n referenceCount: 0\n });\n } else if (!this._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 var _this$_messagesContai;\n if (!message || !this._isElementNode(hostElement)) {\n return;\n }\n const key = getKey(message, role);\n if (this._isElementDescribedByMessage(hostElement, key)) {\n this._removeMessageReference(hostElement, key);\n }\n // If the message is a string, it means that it's one that we created for the\n // consumer so we can remove it safely, otherwise we should leave it in place.\n if (typeof message === 'string') {\n const registeredMessage = this._messageRegistry.get(key);\n if (registeredMessage && registeredMessage.referenceCount === 0) {\n this._deleteMessageElement(key);\n }\n }\n if (((_this$_messagesContai = this._messagesContainer) === null || _this$_messagesContai === void 0 ? void 0 : _this$_messagesContai.childNodes.length) === 0) {\n this._messagesContainer.remove();\n this._messagesContainer = null;\n }\n }\n /** Unregisters all created message elements and removes the message container. */\n ngOnDestroy() {\n var _this$_messagesContai2;\n const describedElements = this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}=\"${this._id}\"]`);\n for (let i = 0; i < describedElements.length; i++) {\n this._removeCdkDescribedByReferenceIds(describedElements[i]);\n describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n }\n (_this$_messagesContai2 = this._messagesContainer) === null || _this$_messagesContai2 === void 0 || _this$_messagesContai2.remove();\n this._messagesContainer = null;\n this._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, this._id);\n messageElement.textContent = message;\n if (role) {\n messageElement.setAttribute('role', role);\n }\n this._createMessagesContainer();\n this._messagesContainer.appendChild(messageElement);\n this._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 var _this$_messageRegistr;\n (_this$_messageRegistr = this._messageRegistry.get(key)) === null || _this$_messageRegistr === void 0 || (_this$_messageRegistr = _this$_messageRegistr.messageElement) === null || _this$_messageRegistr === void 0 || _this$_messageRegistr.remove();\n this._messageRegistry.delete(key);\n }\n /** Creates the global container for all aria-describedby messages. */\n _createMessagesContainer() {\n if (this._messagesContainer) {\n return;\n }\n const containerClassName = 'cdk-describedby-message-container';\n const serverContainers = this._document.querySelectorAll(`.${containerClassName}[platform=\"server\"]`);\n for (let i = 0; i < serverContainers.length; i++) {\n // When going from the server to the client, we may end up in a situation where there's\n // already a container on the page, but we don't have a reference to it. Clear the\n // old container so we don't get duplicates. Doing this, instead of emptying the previous\n // container, should be slightly faster.\n serverContainers[i].remove();\n }\n const messagesContainer = this._document.createElement('div');\n // We add `visibility: hidden` in order to prevent text in this container from\n // being searchable by the browser's Ctrl + F functionality.\n // Screen-readers will still read the description for elements with aria-describedby even\n // when the description element is not visible.\n messagesContainer.style.visibility = 'hidden';\n // Even though we use `visibility: hidden`, we still apply `cdk-visually-hidden` so that\n // the description element doesn't impact page layout.\n messagesContainer.classList.add(containerClassName);\n messagesContainer.classList.add('cdk-visually-hidden');\n // @breaking-change 14.0.0 Remove null check for `_platform`.\n if (this._platform && !this._platform.isBrowser) {\n messagesContainer.setAttribute('platform', 'server');\n }\n this._document.body.appendChild(messagesContainer);\n this._messagesContainer = messagesContainer;\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 = this._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, this._id);\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 = this._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 = this._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 ? '' : `${message}`.trim();\n const ariaLabel = element.getAttribute('aria-label');\n // We shouldn't set descriptions if they're exactly the same as the `aria-label` of the\n // element, because screen readers will end up reading out the same text twice in a row.\n return trimmedMessage ? !ariaLabel || ariaLabel.trim() !== trimmedMessage : false;\n }\n /** Checks whether a node is an Element node. */\n _isElementNode(element) {\n return element.nodeType === this._document.ELEMENT_NODE;\n }\n}\n_AriaDescriber = AriaDescriber;\n_AriaDescriber.ɵfac = function _AriaDescriber_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _AriaDescriber)(i0.ɵɵinject(DOCUMENT), i0.ɵɵinject(i1.Platform));\n};\n_AriaDescriber.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n token: _AriaDescriber,\n factory: _AriaDescriber.ɵfac,\n providedIn: 'root'\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(AriaDescriber, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], () => [{\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }, {\n type: i1.Platform\n }], null);\n})();\n/** Gets a key that can be used to look messages up in the registry. */\nfunction getKey(message, role) {\n return typeof message === 'string' ? `${role || ''}/${message}` : message;\n}\n/** Assigns a unique ID to an element, if it doesn't have one already. */\nfunction setMessageId(element, serviceId) {\n if (!element.id) {\n element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${serviceId}-${nextId++}`;\n }\n}\nconst DEFAULT_TYPEAHEAD_DEBOUNCE_INTERVAL_MS = 200;\n/**\n * Selects items based on keyboard inputs. Implements the typeahead functionality of\n * `role=\"listbox\"` or `role=\"tree\"` and other related roles.\n */\nclass Typeahead {\n constructor(initialItems, config) {\n this._letterKeyStream = new Subject();\n this._items = [];\n this._selectedItemIndex = -1;\n /** Buffer for the letters that the user has pressed */\n this._pressedLetters = [];\n this._selectedItem = new Subject();\n this.selectedItem = this._selectedItem;\n const typeAheadInterval = typeof (config === null || config === void 0 ? void 0 : config.debounceInterval) === 'number' ? config.debounceInterval : DEFAULT_TYPEAHEAD_DEBOUNCE_INTERVAL_MS;\n if (config !== null && config !== void 0 && config.skipPredicate) {\n this._skipPredicateFn = config.skipPredicate;\n }\n if ((typeof ngDevMode === 'undefined' || ngDevMode) && initialItems.length && initialItems.some(item => typeof item.getLabel !== 'function')) {\n throw new Error('KeyManager items in typeahead mode must implement the `getLabel` method.');\n }\n this.setItems(initialItems);\n this._setupKeyHandler(typeAheadInterval);\n }\n destroy() {\n this._pressedLetters = [];\n this._letterKeyStream.complete();\n this._selectedItem.complete();\n }\n setCurrentSelectedItemIndex(index) {\n this._selectedItemIndex = index;\n }\n setItems(items) {\n this._items = items;\n }\n handleKey(event) {\n const keyCode = event.keyCode;\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 /** Gets whether the user is currently typing into the manager using the typeahead feature. */\n isTyping() {\n return this._pressedLetters.length > 0;\n }\n /** Resets the currently stored sequence of typed letters. */\n reset() {\n this._pressedLetters = [];\n }\n _setupKeyHandler(typeAheadInterval) {\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._letterKeyStream.pipe(tap(letter => this._pressedLetters.push(letter)), debounceTime(typeAheadInterval), filter(() => this._pressedLetters.length > 0), map(() => this._pressedLetters.join('').toLocaleUpperCase())).subscribe(inputString => {\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 < this._items.length + 1; i++) {\n var _this$_skipPredicateF, _item$getLabel;\n const index = (this._selectedItemIndex + i) % this._items.length;\n const item = this._items[index];\n if (!((_this$_skipPredicateF = this._skipPredicateFn) !== null && _this$_skipPredicateF !== void 0 && _this$_skipPredicateF.call(this, item)) && ((_item$getLabel = item.getLabel) === null || _item$getLabel === void 0 ? void 0 : _item$getLabel.call(item).toLocaleUpperCase().trim().indexOf(inputString)) === 0) {\n this._selectedItem.next(item);\n break;\n }\n }\n this._pressedLetters = [];\n });\n }\n}\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, injector) {\n this._items = _items;\n this._activeItemIndex = -1;\n this._activeItem = signal(null);\n this._wrap = false;\n this._typeaheadSubscription = Subscription.EMPTY;\n this._vertical = true;\n this._allowedModifierKeys = [];\n this._homeAndEnd = false;\n this._pageUpAndDown = {\n enabled: false,\n delta: 10\n };\n /**\n * Predicate function that can be used to check whether an item should be skipped\n * by the key manager. By default, disabled items are skipped.\n */\n this._skipPredicateFn = item => item.disabled;\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 this._itemChangesSubscription = _items.changes.subscribe(newItems => this._itemsChanged(newItems.toArray()));\n } else if (isSignal(_items)) {\n if (!injector && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n throw new Error('ListKeyManager constructed with a signal must receive an injector');\n }\n this._effectRef = effect(() => this._itemsChanged(_items()), {\n injector\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) {\n const items = this._getItemsArray();\n if (items.length > 0 && items.some(item => typeof item.getLabel !== 'function')) {\n throw Error('ListKeyManager items in typeahead mode must implement the `getLabel` method.');\n }\n }\n this._typeaheadSubscription.unsubscribe();\n const items = this._getItemsArray();\n this._typeahead = new Typeahead(items, {\n debounceInterval: typeof debounceInterval === 'number' ? debounceInterval : undefined,\n skipPredicate: item => this._skipPredicateFn(item)\n });\n this._typeaheadSubscription = this._typeahead.selectedItem.subscribe(item => {\n this.setActiveItem(item);\n });\n return this;\n }\n /** Cancels the current typeahead sequence. */\n cancelTypeahead() {\n var _this$_typeahead;\n (_this$_typeahead = this._typeahead) === null || _this$_typeahead === void 0 || _this$_typeahead.reset();\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 /**\n * Configures the key manager to activate every 10th, configured or first/last element in up/down direction\n * respectively when the Page-Up or Page-Down key is pressed.\n * @param enabled Whether pressing the Page-Up or Page-Down key activates the first/last item.\n * @param delta Whether pressing the Home or End key activates the first/last item.\n */\n withPageUpDown(enabled = true, delta = 10) {\n this._pageUpAndDown = {\n enabled,\n delta\n };\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 var _this$_typeahead3;\n const keyCode = event.keyCode;\n const modifiers = ['altKey', 'ctrlKey', 'metaKey', 'shiftKey'];\n const isModifierAllowed = modifiers.every(modifier => {\n return !event[modifier] || this._allowedModifierKeys.indexOf(modifier) > -1;\n });\n switch (keyCode) {\n case TAB:\n this.tabOut.next();\n return;\n case DOWN_ARROW:\n if (this._vertical && isModifierAllowed) {\n this.setNextItemActive();\n break;\n } else {\n return;\n }\n case UP_ARROW:\n if (this._vertical && isModifierAllowed) {\n this.setPreviousItemActive();\n break;\n } else {\n return;\n }\n case RIGHT_ARROW:\n if (this._horizontal && isModifierAllowed) {\n this._horizontal === 'rtl' ? this.setPreviousItemActive() : this.setNextItemActive();\n break;\n } else {\n return;\n }\n case LEFT_ARROW:\n if (this._horizontal && isModifierAllowed) {\n this._horizontal === 'rtl' ? this.setNextItemActive() : this.setPreviousItemActive();\n break;\n } else {\n return;\n }\n case HOME:\n if (this._homeAndEnd && isModifierAllowed) {\n this.setFirstItemActive();\n break;\n } else {\n return;\n }\n case END:\n if (this._homeAndEnd && isModifierAllowed) {\n this.setLastItemActive();\n break;\n } else {\n return;\n }\n case PAGE_UP:\n if (this._pageUpAndDown.enabled && isModifierAllowed) {\n const targetIndex = this._activeItemIndex - this._pageUpAndDown.delta;\n this._setActiveItemByIndex(targetIndex > 0 ? targetIndex : 0, 1);\n break;\n } else {\n return;\n }\n case PAGE_DOWN:\n if (this._pageUpAndDown.enabled && isModifierAllowed) {\n const targetIndex = this._activeItemIndex + this._pageUpAndDown.delta;\n const itemsLength = this._getItemsArray().length;\n this._setActiveItemByIndex(targetIndex < itemsLength ? targetIndex : itemsLength - 1, -1);\n break;\n } else {\n return;\n }\n default:\n if (isModifierAllowed || hasModifierKey(event, 'shiftKey')) {\n var _this$_typeahead2;\n (_this$_typeahead2 = this._typeahead) === null || _this$_typeahead2 === void 0 || _this$_typeahead2.handleKey(event);\n }\n // Note that we return here, in order to avoid preventing\n // the default action of non-navigational keys.\n return;\n }\n (_this$_typeahead3 = this._typeahead) === null || _this$_typeahead3 === void 0 || _this$_typeahead3.reset();\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._typeahead && this._typeahead.isTyping();\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._getItemsArray().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 var _this$_typeahead4;\n const itemArray = this._getItemsArray();\n const index = typeof item === 'number' ? item : itemArray.indexOf(item);\n const activeItem = itemArray[index];\n // Explicitly check for `null` and `undefined` because other falsy values are valid.\n this._activeItem.set(activeItem == null ? null : activeItem);\n this._activeItemIndex = index;\n (_this$_typeahead4 = this._typeahead) === null || _this$_typeahead4 === void 0 || _this$_typeahead4.setCurrentSelectedItemIndex(index);\n }\n /** Cleans up the key manager. */\n destroy() {\n var _this$_itemChangesSub, _this$_effectRef, _this$_typeahead5;\n this._typeaheadSubscription.unsubscribe();\n (_this$_itemChangesSub = this._itemChangesSubscription) === null || _this$_itemChangesSub === void 0 || _this$_itemChangesSub.unsubscribe();\n (_this$_effectRef = this._effectRef) === null || _this$_effectRef === void 0 || _this$_effectRef.destroy();\n (_this$_typeahead5 = this._typeahead) === null || _this$_typeahead5 === void 0 || _this$_typeahead5.destroy();\n this.tabOut.complete();\n this.change.complete();\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 if (isSignal(this._items)) {\n return this._items();\n }\n return this._items instanceof QueryList ? this._items.toArray() : this._items;\n }\n /** Callback for when the items have changed. */\n _itemsChanged(newItems) {\n var _this$_typeahead6;\n (_this$_typeahead6 = this._typeahead) === null || _this$_typeahead6 === void 0 || _this$_typeahead6.setItems(newItems);\n const activeItem = this._activeItem();\n if (activeItem) {\n const newIndex = newItems.indexOf(activeItem);\n if (newIndex > -1 && newIndex !== this._activeItemIndex) {\n var _this$_typeahead7;\n this._activeItemIndex = newIndex;\n (_this$_typeahead7 = this._typeahead) === null || _this$_typeahead7 === void 0 || _this$_typeahead7.setCurrentSelectedItemIndex(newIndex);\n }\n }\n }\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}\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 * This class manages keyboard events for trees. If you pass it a QueryList or other list of tree\n * items, it will set the active item, focus, handle expansion and typeahead correctly when\n * keyboard events occur.\n */\nclass TreeKeyManager {\n _initializeFocus() {\n if (this._hasInitialFocused || this._items.length === 0) {\n return;\n }\n let activeIndex = 0;\n for (let i = 0; i < this._items.length; i++) {\n if (!this._skipPredicateFn(this._items[i]) && !this._isItemDisabled(this._items[i])) {\n activeIndex = i;\n break;\n }\n }\n const activeItem = this._items[activeIndex];\n // Use `makeFocusable` here, because we want the item to just be focusable, not actually\n // capture the focus since the user isn't interacting with it. See #29628.\n if (activeItem.makeFocusable) {\n var _this$_activeItem, _this$_typeahead8;\n (_this$_activeItem = this._activeItem) === null || _this$_activeItem === void 0 || _this$_activeItem.unfocus();\n this._activeItemIndex = activeIndex;\n this._activeItem = activeItem;\n (_this$_typeahead8 = this._typeahead) === null || _this$_typeahead8 === void 0 || _this$_typeahead8.setCurrentSelectedItemIndex(activeIndex);\n activeItem.makeFocusable();\n } else {\n // Backwards compatibility for items that don't implement `makeFocusable`.\n this.focusItem(activeIndex);\n }\n this._hasInitialFocused = true;\n }\n /**\n *\n * @param items List of TreeKeyManager options. Can be synchronous or asynchronous.\n * @param config Optional configuration options. By default, use 'ltr' horizontal orientation. By\n * default, do not skip any nodes. By default, key manager only calls `focus` method when items\n * are focused and does not call `activate`. If `typeaheadDefaultInterval` is `true`, use a\n * default interval of 200ms.\n */\n constructor(items, config) {\n /** The index of the currently active (focused) item. */\n this._activeItemIndex = -1;\n /** The currently active (focused) item. */\n this._activeItem = null;\n /** Whether or not we activate the item when it's focused. */\n this._shouldActivationFollowFocus = false;\n /**\n * The orientation that the tree is laid out in. In `rtl` mode, the behavior of Left and\n * Right arrow are switched.\n */\n this._horizontalOrientation = 'ltr';\n /**\n * Predicate function that can be used to check whether an item should be skipped\n * by the key manager.\n *\n * The default value for this doesn't skip any elements in order to keep tree items focusable\n * when disabled. This aligns with ARIA guidelines:\n * https://www.w3.org/WAI/ARIA/apg/practices/keyboard-interface/#focusabilityofdisabledcontrols.\n */\n this._skipPredicateFn = _item => false;\n /** Function to determine equivalent items. */\n this._trackByFn = item => item;\n /** Synchronous cache of the items to manage. */\n this._items = [];\n this._typeaheadSubscription = Subscription.EMPTY;\n this._hasInitialFocused = false;\n /** Stream that emits any time the focused item changes. */\n this.change = new Subject();\n // We allow for the items to be an array or Observable because, in some cases, the consumer may\n // not have access to a QueryList of the items they want to manage (e.g. when the\n // items aren't being collected via `ViewChildren` or `ContentChildren`).\n if (items instanceof QueryList) {\n this._items = items.toArray();\n items.changes.subscribe(newItems => {\n var _this$_typeahead9;\n this._items = newItems.toArray();\n (_this$_typeahead9 = this._typeahead) === null || _this$_typeahead9 === void 0 || _this$_typeahead9.setItems(this._items);\n this._updateActiveItemIndex(this._items);\n this._initializeFocus();\n });\n } else if (isObservable(items)) {\n items.subscribe(newItems => {\n var _this$_typeahead10;\n this._items = newItems;\n (_this$_typeahead10 = this._typeahead) === null || _this$_typeahead10 === void 0 || _this$_typeahead10.setItems(newItems);\n this._updateActiveItemIndex(newItems);\n this._initializeFocus();\n });\n } else {\n this._items = items;\n this._initializeFocus();\n }\n if (typeof config.shouldActivationFollowFocus === 'boolean') {\n this._shouldActivationFollowFocus = config.shouldActivationFollowFocus;\n }\n if (config.horizontalOrientation) {\n this._horizontalOrientation = config.horizontalOrientation;\n }\n if (config.skipPredicate) {\n this._skipPredicateFn = config.skipPredicate;\n }\n if (config.trackBy) {\n this._trackByFn = config.trackBy;\n }\n if (typeof config.typeAheadDebounceInterval !== 'undefined') {\n this._setTypeAhead(config.typeAheadDebounceInterval);\n }\n }\n /** Cleans up the key manager. */\n destroy() {\n var _this$_typeahead11;\n this._typeaheadSubscription.unsubscribe();\n (_this$_typeahead11 = this._typeahead) === null || _this$_typeahead11 === void 0 || _this$_typeahead11.destroy();\n this.change.complete();\n }\n /**\n * Handles a keyboard event on the tree.\n * @param event Keyboard event that represents the user interaction with the tree.\n */\n onKeydown(event) {\n var _this$_typeahead12, _this$_typeahead13;\n const key = event.key;\n switch (key) {\n case 'Tab':\n // Return early here, in order to allow Tab to actually tab out of the tree\n return;\n case 'ArrowDown':\n this._focusNextItem();\n break;\n case 'ArrowUp':\n this._focusPreviousItem();\n break;\n case 'ArrowRight':\n this._horizontalOrientation === 'rtl' ? this._collapseCurrentItem() : this._expandCurrentItem();\n break;\n case 'ArrowLeft':\n this._horizontalOrientation === 'rtl' ? this._expandCurrentItem() : this._collapseCurrentItem();\n break;\n case 'Home':\n this._focusFirstItem();\n break;\n case 'End':\n this._focusLastItem();\n break;\n case 'Enter':\n case ' ':\n this._activateCurrentItem();\n break;\n default:\n if (event.key === '*') {\n this._expandAllItemsAtCurrentItemLevel();\n break;\n }\n (_this$_typeahead12 = this._typeahead) === null || _this$_typeahead12 === void 0 || _this$_typeahead12.handleKey(event);\n // Return here, in order to avoid preventing the default action of non-navigational\n // keys or resetting the buffer of pressed letters.\n return;\n }\n // Reset the typeahead since the user has used a navigational key.\n (_this$_typeahead13 = this._typeahead) === null || _this$_typeahead13 === void 0 || _this$_typeahead13.reset();\n event.preventDefault();\n }\n /** Index of the currently active item. */\n getActiveItemIndex() {\n return this._activeItemIndex;\n }\n /** The currently active item. */\n getActiveItem() {\n return this._activeItem;\n }\n /** Focus the first available item. */\n _focusFirstItem() {\n this.focusItem(this._findNextAvailableItemIndex(-1));\n }\n /** Focus the last available item. */\n _focusLastItem() {\n this.focusItem(this._findPreviousAvailableItemIndex(this._items.length));\n }\n /** Focus the next available item. */\n _focusNextItem() {\n this.focusItem(this._findNextAvailableItemIndex(this._activeItemIndex));\n }\n /** Focus the previous available item. */\n _focusPreviousItem() {\n this.focusItem(this._findPreviousAvailableItemIndex(this._activeItemIndex));\n }\n focusItem(itemOrIndex, options = {}) {\n var _options$emitChangeEv, _this$_typeahead14, _this$_activeItem2;\n // Set default options\n (_options$emitChangeEv = options.emitChangeEvent) !== null && _options$emitChangeEv !== void 0 ? _options$emitChangeEv : options.emitChangeEvent = true;\n let index = typeof itemOrIndex === 'number' ? itemOrIndex : this._items.findIndex(item => this._trackByFn(item) === this._trackByFn(itemOrIndex));\n if (index < 0 || index >= this._items.length) {\n return;\n }\n const activeItem = this._items[index];\n // If we're just setting the same item, don't re-call activate or focus\n if (this._activeItem !== null && this._trackByFn(activeItem) === this._trackByFn(this._activeItem)) {\n return;\n }\n const previousActiveItem = this._activeItem;\n this._activeItem = activeItem !== null && activeItem !== void 0 ? activeItem : null;\n this._activeItemIndex = index;\n (_this$_typeahead14 = this._typeahead) === null || _this$_typeahead14 === void 0 || _this$_typeahead14.setCurrentSelectedItemIndex(index);\n (_this$_activeItem2 = this._activeItem) === null || _this$_activeItem2 === void 0 || _this$_activeItem2.focus();\n previousActiveItem === null || previousActiveItem === void 0 || previousActiveItem.unfocus();\n if (options.emitChangeEvent) {\n this.change.next(this._activeItem);\n }\n if (this._shouldActivationFollowFocus) {\n this._activateCurrentItem();\n }\n }\n _updateActiveItemIndex(newItems) {\n const activeItem = this._activeItem;\n if (!activeItem) {\n return;\n }\n const newIndex = newItems.findIndex(item => this._trackByFn(item) === this._trackByFn(activeItem));\n if (newIndex > -1 && newIndex !== this._activeItemIndex) {\n var _this$_typeahead15;\n this._activeItemIndex = newIndex;\n (_this$_typeahead15 = this._typeahead) === null || _this$_typeahead15 === void 0 || _this$_typeahead15.setCurrentSelectedItemIndex(newIndex);\n }\n }\n _setTypeAhead(debounceInterval) {\n this._typeahead = new Typeahead(this._items, {\n debounceInterval: typeof debounceInterval === 'number' ? debounceInterval : undefined,\n skipPredicate: item => this._skipPredicateFn(item)\n });\n this._typeaheadSubscription = this._typeahead.selectedItem.subscribe(item => {\n this.focusItem(item);\n });\n }\n _findNextAvailableItemIndex(startingIndex) {\n for (let i = startingIndex + 1; i < this._items.length; i++) {\n if (!this._skipPredicateFn(this._items[i])) {\n return i;\n }\n }\n return startingIndex;\n }\n _findPreviousAvailableItemIndex(startingIndex) {\n for (let i = startingIndex - 1; i >= 0; i--) {\n if (!this._skipPredicateFn(this._items[i])) {\n return i;\n }\n }\n return startingIndex;\n }\n /**\n * If the item is already expanded, we collapse the item. Otherwise, we will focus the parent.\n */\n _collapseCurrentItem() {\n if (!this._activeItem) {\n return;\n }\n if (this._isCurrentItemExpanded()) {\n this._activeItem.collapse();\n } else {\n const parent = this._activeItem.getParent();\n if (!parent || this._skipPredicateFn(parent)) {\n return;\n }\n this.focusItem(parent);\n }\n }\n /**\n * If the item is already collapsed, we expand the item. Otherwise, we will focus the first child.\n */\n _expandCurrentItem() {\n if (!this._activeItem) {\n return;\n }\n if (!this._isCurrentItemExpanded()) {\n this._activeItem.expand();\n } else {\n coerceObservable(this._activeItem.getChildren()).pipe(take(1)).subscribe(children => {\n const firstChild = children.find(child => !this._skipPredicateFn(child));\n if (!firstChild) {\n return;\n }\n this.focusItem(firstChild);\n });\n }\n }\n _isCurrentItemExpanded() {\n if (!this._activeItem) {\n return false;\n }\n return typeof this._activeItem.isExpanded === 'boolean' ? this._activeItem.isExpanded : this._activeItem.isExpanded();\n }\n _isItemDisabled(item) {\n var _item$isDisabled;\n return typeof item.isDisabled === 'boolean' ? item.isDisabled : (_item$isDisabled = item.isDisabled) === null || _item$isDisabled === void 0 ? void 0 : _item$isDisabled.call(item);\n }\n /** For all items that are the same level as the current item, we expand those items. */\n _expandAllItemsAtCurrentItemLevel() {\n if (!this._activeItem) {\n return;\n }\n const parent = this._activeItem.getParent();\n let itemsToExpand;\n if (!parent) {\n itemsToExpand = of(this._items.filter(item => item.getParent() === null));\n } else {\n itemsToExpand = coerceObservable(parent.getChildren());\n }\n itemsToExpand.pipe(take(1)).subscribe(items => {\n for (const item of items) {\n item.expand();\n }\n });\n }\n _activateCurrentItem() {\n var _this$_activeItem3;\n (_this$_activeItem3 = this._activeItem) === null || _this$_activeItem3 === void 0 || _this$_activeItem3.activate();\n }\n}\n/** @docs-private */\nfunction TREE_KEY_MANAGER_FACTORY() {\n return (items, options) => new TreeKeyManager(items, options);\n}\n/** Injection token that determines the key manager to use. */\nconst TREE_KEY_MANAGER = new InjectionToken('tree-key-manager', {\n providedIn: 'root',\n factory: TREE_KEY_MANAGER_FACTORY\n});\n/** @docs-private */\nconst TREE_KEY_MANAGER_FACTORY_PROVIDER = {\n provide: TREE_KEY_MANAGER,\n useFactory: TREE_KEY_MANAGER_FACTORY\n};\n\n// NoopTreeKeyManager is a \"noop\" implementation of TreeKeyMangerStrategy. Methods are noops. Does\n// not emit to streams.\n//\n// Used for applications built before TreeKeyManager to opt-out of TreeKeyManager and revert to\n// legacy behavior.\n/**\n * @docs-private\n *\n * Opt-out of Tree of key manager behavior.\n *\n * When provided, Tree has same focus management behavior as before TreeKeyManager was introduced.\n * - Tree does not respond to keyboard interaction\n * - Tree node allows tabindex to be set by Input binding\n * - Tree node allows tabindex to be set by attribute binding\n *\n * @deprecated NoopTreeKeyManager deprecated. Use TreeKeyManager or inject a\n * TreeKeyManagerStrategy instead. To be removed in a future version.\n *\n * @breaking-change 21.0.0\n */\nclass NoopTreeKeyManager {\n constructor() {\n this._isNoopTreeKeyManager = true;\n // Provide change as required by TreeKeyManagerStrategy. NoopTreeKeyManager is a \"noop\"\n // implementation that does not emit to streams.\n this.change = new Subject();\n }\n destroy() {\n this.change.complete();\n }\n onKeydown() {\n // noop\n }\n getActiveItemIndex() {\n // Always return null. NoopTreeKeyManager is a \"noop\" implementation that does not maintain\n // the active item.\n return null;\n }\n getActiveItem() {\n // Always return null. NoopTreeKeyManager is a \"noop\" implementation that does not maintain\n // the active item.\n return null;\n }\n focusItem() {\n // noop\n }\n}\n/**\n * @docs-private\n *\n * Opt-out of Tree of key manager behavior.\n *\n * When provided, Tree has same focus management behavior as before TreeKeyManager was introduced.\n * - Tree does not respond to keyboard interaction\n * - Tree node allows tabindex to be set by Input binding\n * - Tree node allows tabindex to be set by attribute binding\n *\n * @deprecated NoopTreeKeyManager deprecated. Use TreeKeyManager or inject a\n * TreeKeyManagerStrategy instead. To be removed in a future version.\n *\n * @breaking-change 21.0.0\n */\nfunction NOOP_TREE_KEY_MANAGER_FACTORY() {\n return () => new NoopTreeKeyManager();\n}\n/**\n * @docs-private\n *\n * Opt-out of Tree of key manager behavior.\n *\n * When provided, Tree has same focus management behavior as before TreeKeyManager was introduced.\n * - Tree does not respond to keyboard interaction\n * - Tree node allows tabindex to be set by Input binding\n * - Tree node allows tabindex to be set by attribute binding\n *\n * @deprecated NoopTreeKeyManager deprecated. Use TreeKeyManager or inject a\n * TreeKeyManagerStrategy instead. To be removed in a future version.\n *\n * @breaking-change 21.0.0\n */\nconst NOOP_TREE_KEY_MANAGER_FACTORY_PROVIDER = {\n provide: TREE_KEY_MANAGER,\n useFactory: NOOP_TREE_KEY_MANAGER_FACTORY\n};\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 it 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}\n_InteractivityChecker = InteractivityChecker;\n_InteractivityChecker.ɵfac = function _InteractivityChecker_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _InteractivityChecker)(i0.ɵɵinject(i1.Platform));\n};\n_InteractivityChecker.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n token: _InteractivityChecker,\n factory: _InteractivityChecker.ɵfac,\n providedIn: 'root'\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(InteractivityChecker, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], () => [{\n type: i1.Platform\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 {\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 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 * 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 */\nclass FocusTrap {\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 constructor(_element, _checker, _ngZone, _document, deferAnchors = false, /** @breaking-change 20.0.0 param to become required */\n _injector) {\n this._element = _element;\n this._checker = _checker;\n this._ngZone = _ngZone;\n this._document = _document;\n this._injector = _injector;\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 /** 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 startAnchor.remove();\n }\n if (endAnchor) {\n endAnchor.removeEventListener('focus', this.endAnchorListener);\n endAnchor.remove();\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 focuses the first tabbable element.\n * @returns Returns a promise that resolves with a boolean, depending\n * on whether focus was moved successfully.\n */\n focusInitialElementWhenReady(options) {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusInitialElement(options)));\n });\n }\n /**\n * Waits for the zone to stabilize, then focuses\n * the first tabbable element within the focus trap region.\n * @returns Returns a promise that resolves with a boolean, depending\n * on whether focus was moved successfully.\n */\n focusFirstTabbableElementWhenReady(options) {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusFirstTabbableElement(options)));\n });\n }\n /**\n * Waits for the zone to stabilize, then focuses\n * the last tabbable element within the focus trap region.\n * @returns Returns a promise that resolves with a boolean, depending\n * on whether focus was moved successfully.\n */\n focusLastTabbableElementWhenReady(options) {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusLastTabbableElement(options)));\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 const markers = this._element.querySelectorAll(`[cdk-focus-region-${bound}], ` + `[cdkFocusRegion${bound}], ` + `[cdk-focus-${bound}]`);\n if (typeof ngDevMode === 'undefined' || ngDevMode) {\n for (let i = 0; i < markers.length; i++) {\n // @breaking-change 8.0.0\n if (markers[i].hasAttribute(`cdk-focus-${bound}`)) {\n console.warn(`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 }\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(options) {\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 ((typeof ngDevMode === 'undefined' || ngDevMode) && 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 || focusableChild.focus(options);\n return !!focusableChild;\n }\n redirectToElement.focus(options);\n return true;\n }\n return this.focusFirstTabbableElement(options);\n }\n /**\n * Focuses the first tabbable element within the focus trap region.\n * @returns Whether focus was moved successfully.\n */\n focusFirstTabbableElement(options) {\n const redirectToElement = this._getRegionBoundary('start');\n if (redirectToElement) {\n redirectToElement.focus(options);\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(options) {\n const redirectToElement = this._getRegionBoundary('end');\n if (redirectToElement) {\n redirectToElement.focus(options);\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 const children = root.children;\n for (let i = 0; i < children.length; i++) {\n const 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 const children = root.children;\n for (let i = children.length - 1; i >= 0; i--) {\n const 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 // TODO: remove this conditional when injector is required in the constructor.\n if (this._injector) {\n afterNextRender(fn, {\n injector: this._injector\n });\n } else {\n setTimeout(fn);\n }\n }\n}\n/**\n * Factory that allows easy instantiation of focus traps.\n */\nclass FocusTrapFactory {\n constructor(_checker, _ngZone, _document) {\n this._checker = _checker;\n this._ngZone = _ngZone;\n this._injector = inject(Injector);\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, this._injector);\n }\n}\n_FocusTrapFactory = FocusTrapFactory;\n_FocusTrapFactory.ɵfac = function _FocusTrapFactory_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _FocusTrapFactory)(i0.ɵɵinject(InteractivityChecker), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(DOCUMENT));\n};\n_FocusTrapFactory.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n token: _FocusTrapFactory,\n factory: _FocusTrapFactory.ɵfac,\n providedIn: 'root'\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(FocusTrapFactory, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], () => [{\n type: InteractivityChecker\n }, {\n type: i0.NgZone\n }, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }], null);\n})();\n/** Directive for trapping focus within a region. */\nclass CdkTrapFocus {\n /** Whether the focus trap is active. */\n get enabled() {\n var _this$focusTrap;\n return ((_this$focusTrap = this.focusTrap) === null || _this$focusTrap === void 0 ? void 0 : _this$focusTrap.enabled) || false;\n }\n set enabled(value) {\n if (this.focusTrap) {\n this.focusTrap.enabled = value;\n }\n }\n constructor(_elementRef, _focusTrapFactory,\n /**\n * @deprecated No longer being used. To be removed.\n * @breaking-change 13.0.0\n */\n _document) {\n this._elementRef = _elementRef;\n this._focusTrapFactory = _focusTrapFactory;\n /** Previously focused element to restore focus to upon destroy when using autoCapture. */\n this._previouslyFocusedElement = null;\n const platform = inject(Platform);\n if (platform.isBrowser) {\n this.focusTrap = this._focusTrapFactory.create(this._elementRef.nativeElement, true);\n }\n }\n ngOnDestroy() {\n var _this$focusTrap2;\n (_this$focusTrap2 = this.focusTrap) === null || _this$focusTrap2 === void 0 || _this$focusTrap2.destroy();\n // If we stored a previously focused element when using autoCapture, return focus to that\n // element now that the trapped region is being destroyed.\n if (this._previouslyFocusedElement) {\n this._previouslyFocusedElement.focus();\n this._previouslyFocusedElement = null;\n }\n }\n ngAfterContentInit() {\n var _this$focusTrap3;\n (_this$focusTrap3 = this.focusTrap) === null || _this$focusTrap3 === void 0 || _this$focusTrap3.attachAnchors();\n if (this.autoCapture) {\n this._captureFocus();\n }\n }\n ngDoCheck() {\n if (this.focusTrap && !this.focusTrap.hasAttached()) {\n this.focusTrap.attachAnchors();\n }\n }\n ngOnChanges(changes) {\n var _this$focusTrap4;\n const autoCaptureChange = changes['autoCapture'];\n if (autoCaptureChange && !autoCaptureChange.firstChange && this.autoCapture && (_this$focusTrap4 = this.focusTrap) !== null && _this$focusTrap4 !== void 0 && _this$focusTrap4.hasAttached()) {\n this._captureFocus();\n }\n }\n _captureFocus() {\n var _this$focusTrap5;\n this._previouslyFocusedElement = _getFocusedElementPierceShadowDom();\n (_this$focusTrap5 = this.focusTrap) === null || _this$focusTrap5 === void 0 || _this$focusTrap5.focusInitialElementWhenReady();\n }\n}\n_CdkTrapFocus = CdkTrapFocus;\n_CdkTrapFocus.ɵfac = function _CdkTrapFocus_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _CdkTrapFocus)(i0.ɵɵdirectiveInject(i0.ElementRef), i0.ɵɵdirectiveInject(FocusTrapFactory), i0.ɵɵdirectiveInject(DOCUMENT));\n};\n_CdkTrapFocus.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n type: _CdkTrapFocus,\n selectors: [[\"\", \"cdkTrapFocus\", \"\"]],\n inputs: {\n enabled: [2, \"cdkTrapFocus\", \"enabled\", booleanAttribute],\n autoCapture: [2, \"cdkTrapFocusAutoCapture\", \"autoCapture\", booleanAttribute]\n },\n exportAs: [\"cdkTrapFocus\"],\n standalone: true,\n features: [i0.ɵɵInputTransformsFeature, i0.ɵɵNgOnChangesFeature]\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkTrapFocus, [{\n type: Directive,\n args: [{\n selector: '[cdkTrapFocus]',\n exportAs: 'cdkTrapFocus',\n standalone: true\n }]\n }], () => [{\n type: i0.ElementRef\n }, {\n type: FocusTrapFactory\n }, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }], {\n enabled: [{\n type: Input,\n args: [{\n alias: 'cdkTrapFocus',\n transform: booleanAttribute\n }]\n }],\n autoCapture: [{\n type: Input,\n args: [{\n alias: 'cdkTrapFocusAutoCapture',\n transform: booleanAttribute\n }]\n }]\n });\n})();\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 /** 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 constructor(_element, _checker, _ngZone, _document, _focusTrapManager, _inertStrategy, config, injector) {\n super(_element, _checker, _ngZone, _document, config.defer, injector);\n this._focusTrapManager = _focusTrapManager;\n this._inertStrategy = _inertStrategy;\n this._focusTrapManager.register(this);\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 * 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 var _target$closest;\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 (target && !focusTrapRoot.contains(target) && !((_target$closest = target.closest) !== null && _target$closest !== void 0 && _target$closest.call(target, 'div.cdk-overlay-pane'))) {\n // Some legacy FocusTrap usages have logic that focuses some element on the page\n // just before FocusTrap is destroyed. For backwards compatibility, wait\n // to be sure FocusTrap is still enabled before refocusing.\n setTimeout(() => {\n // Check whether focus wasn't put back into the focus trap while the timeout was pending.\n if (focusTrap.enabled && !focusTrapRoot.contains(focusTrap._document.activeElement)) {\n focusTrap.focusFirstTabbableElement();\n }\n });\n }\n }\n}\n\n/** The injection token used to specify the inert strategy. */\nconst FOCUS_TRAP_INERT_STRATEGY = new InjectionToken('FOCUS_TRAP_INERT_STRATEGY');\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}\n_FocusTrapManager = FocusTrapManager;\n_FocusTrapManager.ɵfac = function _FocusTrapManager_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _FocusTrapManager)();\n};\n_FocusTrapManager.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n token: _FocusTrapManager,\n factory: _FocusTrapManager.ɵfac,\n providedIn: 'root'\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(FocusTrapManager, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], null, null);\n})();\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._injector = inject(Injector);\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 = {\n defer: false\n }) {\n let configObject;\n if (typeof config === 'boolean') {\n configObject = {\n 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, this._injector);\n }\n}\n_ConfigurableFocusTrapFactory = ConfigurableFocusTrapFactory;\n_ConfigurableFocusTrapFactory.ɵfac = function _ConfigurableFocusTrapFactory_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _ConfigurableFocusTrapFactory)(i0.ɵɵinject(InteractivityChecker), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(FocusTrapManager), i0.ɵɵinject(DOCUMENT), i0.ɵɵinject(FOCUS_TRAP_INERT_STRATEGY, 8));\n};\n_ConfigurableFocusTrapFactory.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n token: _ConfigurableFocusTrapFactory,\n factory: _ConfigurableFocusTrapFactory.ɵfac,\n providedIn: 'root'\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(ConfigurableFocusTrapFactory, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], () => [{\n type: InteractivityChecker\n }, {\n type: i0.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 }], null);\n})();\n\n/** Gets whether an event could be a faked `mousedown` event dispatched by a screen reader. */\nfunction isFakeMousedownFromScreenReader(event) {\n // Some screen readers will dispatch a fake `mousedown` event when pressing enter or space on\n // a clickable element. We can distinguish these events when `event.buttons` is zero, or\n // `event.detail` is zero depending on the browser:\n // - `event.buttons` works on Firefox, but fails on Chrome.\n // - `detail` works on Chrome, but fails on Firefox.\n return event.buttons === 0 || event.detail === 0;\n}\n/** 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 * Injectable options for the InputModalityDetector. These are shallowly merged with the default\n * options.\n */\nconst INPUT_MODALITY_DETECTOR_OPTIONS = new InjectionToken('cdk-input-modality-detector-options');\n/**\n * Default options for the InputModalityDetector.\n *\n * Modifier keys are ignored by default (i.e. when pressed won't cause the service to detect\n * keyboard input modality) for two reasons:\n *\n * 1. Modifier keys are commonly used with mouse to perform actions such as 'right click' or 'open\n * in new tab', and are thus less representative of actual keyboard interaction.\n * 2. VoiceOver triggers some keyboard events when linearly navigating with Control + Option (but\n * confusingly not with Caps Lock). Thus, to have parity with other screen readers, we ignore\n * these keys so as to not update the input modality.\n *\n * Note that we do not by default ignore the right Meta key on Safari because it has the same key\n * code as the ContextMenu key on other browsers. When we switch to using event.key, we can\n * distinguish between the two.\n */\nconst INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS = {\n ignoreKeys: [ALT, CONTROL, MAC_META, META, SHIFT]\n};\n/**\n * The amount of time needed to pass after a touchstart event in order for a subsequent mousedown\n * event to be attributed as mouse and not touch.\n *\n * This is the value used by AngularJS Material. Through trial and error (on iPhone 6S) they found\n * that a value of around 650ms seems appropriate.\n */\nconst TOUCH_BUFFER_MS = 650;\n/**\n * Event listener options that enable capturing and also mark the listener as passive if the browser\n * supports it.\n */\nconst modalityEventListenerOptions = normalizePassiveListenerOptions({\n passive: true,\n capture: true\n});\n/**\n * Service that detects the user's input modality.\n *\n * This service does not update the input modality when a user navigates with a screen reader\n * (e.g. linear navigation with VoiceOver, object navigation / browse mode with NVDA, virtual PC\n * cursor mode with JAWS). This is in part due to technical limitations (i.e. keyboard events do not\n * fire as expected in these modes) but is also arguably the correct behavior. Navigating with a\n * screen reader is akin to visually scanning a page, and should not be interpreted as actual user\n * input interaction.\n *\n * When a user is not navigating but *interacting* with a screen reader, this service attempts to\n * update the input modality to keyboard, but in general this service's behavior is largely\n * undefined.\n */\nclass InputModalityDetector {\n /** The most recently detected input modality. */\n get mostRecentModality() {\n return this._modality.value;\n }\n constructor(_platform, ngZone, document, options) {\n this._platform = _platform;\n /**\n * The most recently detected input modality event target. Is null if no input modality has been\n * detected or if the associated event target is null for some unknown reason.\n */\n this._mostRecentTarget = null;\n /** The underlying BehaviorSubject that emits whenever an input modality is detected. */\n this._modality = new BehaviorSubject(null);\n /**\n * The timestamp of the last touch input modality. Used to determine whether mousedown events\n * should be attributed to mouse or touch.\n */\n this._lastTouchMs = 0;\n /**\n * Handles keydown events. Must be an arrow function in order to preserve the context when it gets\n * bound.\n */\n this._onKeydown = event => {\n var _this$_options;\n // If this is one of the keys we should ignore, then ignore it and don't update the input\n // modality to keyboard.\n if ((_this$_options = this._options) !== null && _this$_options !== void 0 && (_this$_options = _this$_options.ignoreKeys) !== null && _this$_options !== void 0 && _this$_options.some(keyCode => keyCode === event.keyCode)) {\n return;\n }\n this._modality.next('keyboard');\n this._mostRecentTarget = _getEventTarget(event);\n };\n /**\n * Handles mousedown events. Must be an arrow function in order to preserve the context when it\n * gets bound.\n */\n this._onMousedown = event => {\n // Touches trigger both touch and mouse events, so we need to distinguish between mouse events\n // that were triggered via mouse vs touch. To do so, check if the mouse event occurs closely\n // after the previous touch event.\n if (Date.now() - this._lastTouchMs < TOUCH_BUFFER_MS) {\n return;\n }\n // Fake mousedown events are fired by some screen readers when controls are activated by the\n // screen reader. Attribute them to keyboard input modality.\n this._modality.next(isFakeMousedownFromScreenReader(event) ? 'keyboard' : 'mouse');\n this._mostRecentTarget = _getEventTarget(event);\n };\n /**\n * Handles touchstart events. Must be an arrow function in order to preserve the context when it\n * gets bound.\n */\n this._onTouchstart = event => {\n // Same scenario as mentioned in _onMousedown, but on touch screen devices, fake touchstart\n // events are fired. Again, attribute to keyboard input modality.\n if (isFakeTouchstartFromScreenReader(event)) {\n this._modality.next('keyboard');\n return;\n }\n // Store the timestamp of this touch event, as it's used to distinguish between mouse events\n // triggered via mouse vs touch.\n this._lastTouchMs = Date.now();\n this._modality.next('touch');\n this._mostRecentTarget = _getEventTarget(event);\n };\n this._options = {\n ...INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS,\n ...options\n };\n // Skip the first emission as it's null.\n this.modalityDetected = this._modality.pipe(skip(1));\n this.modalityChanged = this.modalityDetected.pipe(distinctUntilChanged());\n // If we're not in a browser, this service should do nothing, as there's no relevant input\n // modality to detect.\n if (_platform.isBrowser) {\n ngZone.runOutsideAngular(() => {\n document.addEventListener('keydown', this._onKeydown, modalityEventListenerOptions);\n document.addEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);\n document.addEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);\n });\n }\n }\n ngOnDestroy() {\n this._modality.complete();\n if (this._platform.isBrowser) {\n document.removeEventListener('keydown', this._onKeydown, modalityEventListenerOptions);\n document.removeEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);\n document.removeEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);\n }\n }\n}\n_InputModalityDetector = InputModalityDetector;\n_InputModalityDetector.ɵfac = function _InputModalityDetector_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _InputModalityDetector)(i0.ɵɵinject(i1.Platform), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(DOCUMENT), i0.ɵɵinject(INPUT_MODALITY_DETECTOR_OPTIONS, 8));\n};\n_InputModalityDetector.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n token: _InputModalityDetector,\n factory: _InputModalityDetector.ɵfac,\n providedIn: 'root'\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(InputModalityDetector, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], () => [{\n type: i1.Platform\n }, {\n type: i0.NgZone\n }, {\n type: Document,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }, {\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [INPUT_MODALITY_DETECTOR_OPTIONS]\n }]\n }], null);\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');\nlet uniqueIds = 0;\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 if (this._liveElement.id) {\n this._exposeAnnouncerToModals(this._liveElement.id);\n }\n // This 100ms timeout is necessary for some browser + screen-reader combinations:\n // - Both JAWS and NVDA over IE11 will not announce anything without a non-zero timeout.\n // - With Chrome and IE11 with NVDA or JAWS, a repeated (identical) message won't be read a\n // second time without clearing and then using a non-zero delay.\n // (using JAWS 17 at time of this writing).\n return this._ngZone.runOutsideAngular(() => {\n if (!this._currentPromise) {\n this._currentPromise = new Promise(resolve => this._currentResolve = resolve);\n }\n clearTimeout(this._previousTimeout);\n this._previousTimeout = setTimeout(() => {\n var _this$_currentResolve;\n this._liveElement.textContent = message;\n if (typeof duration === 'number') {\n this._previousTimeout = setTimeout(() => this.clear(), duration);\n }\n // For some reason in tests this can be undefined\n // Probably related to ZoneJS and every other thing that patches browser APIs in tests\n (_this$_currentResolve = this._currentResolve) === null || _this$_currentResolve === void 0 || _this$_currentResolve.call(this);\n this._currentPromise = this._currentResolve = undefined;\n }, 100);\n return this._currentPromise;\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 var _this$_liveElement, _this$_currentResolve2;\n clearTimeout(this._previousTimeout);\n (_this$_liveElement = this._liveElement) === null || _this$_liveElement === void 0 || _this$_liveElement.remove();\n this._liveElement = null;\n (_this$_currentResolve2 = this._currentResolve) === null || _this$_currentResolve2 === void 0 || _this$_currentResolve2.call(this);\n this._currentPromise = this._currentResolve = undefined;\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].remove();\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 liveEl.id = `cdk-live-announcer-${uniqueIds++}`;\n this._document.body.appendChild(liveEl);\n return liveEl;\n }\n /**\n * Some browsers won't expose the accessibility node of the live announcer element if there is an\n * `aria-modal` and the live announcer is outside of it. This method works around the issue by\n * pointing the `aria-owns` of all modals to the live announcer element.\n */\n _exposeAnnouncerToModals(id) {\n // TODO(http://github.com/angular/components/issues/26853): consider de-duplicating this with\n // the `SnakBarContainer` and other usages.\n //\n // Note that the selector here is limited to CDK overlays at the moment in order to reduce the\n // section of the DOM we need to look through. This should cover all the cases we support, but\n // the selector can be expanded if it turns out to be too narrow.\n const modals = this._document.querySelectorAll('body > .cdk-overlay-container [aria-modal=\"true\"]');\n for (let i = 0; i < modals.length; i++) {\n const modal = modals[i];\n const ariaOwns = modal.getAttribute('aria-owns');\n if (!ariaOwns) {\n modal.setAttribute('aria-owns', id);\n } else if (ariaOwns.indexOf(id) === -1) {\n modal.setAttribute('aria-owns', ariaOwns + ' ' + id);\n }\n }\n }\n}\n_LiveAnnouncer = LiveAnnouncer;\n_LiveAnnouncer.ɵfac = function _LiveAnnouncer_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _LiveAnnouncer)(i0.ɵɵinject(LIVE_ANNOUNCER_ELEMENT_TOKEN, 8), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(DOCUMENT), i0.ɵɵinject(LIVE_ANNOUNCER_DEFAULT_OPTIONS, 8));\n};\n_LiveAnnouncer.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n token: _LiveAnnouncer,\n factory: _LiveAnnouncer.ɵfac,\n providedIn: 'root'\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(LiveAnnouncer, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], () => [{\n type: undefined,\n decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [LIVE_ANNOUNCER_ELEMENT_TOKEN]\n }]\n }, {\n type: i0.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 }], 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 /** 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, this.duration);\n this._previousAnnouncedText = elementText;\n }\n });\n });\n }\n }\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 ngOnDestroy() {\n if (this._subscription) {\n this._subscription.unsubscribe();\n }\n }\n}\n_CdkAriaLive = CdkAriaLive;\n_CdkAriaLive.ɵfac = function _CdkAriaLive_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _CdkAriaLive)(i0.ɵɵdirectiveInject(i0.ElementRef), i0.ɵɵdirectiveInject(LiveAnnouncer), i0.ɵɵdirectiveInject(i1$1.ContentObserver), i0.ɵɵdirectiveInject(i0.NgZone));\n};\n_CdkAriaLive.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n type: _CdkAriaLive,\n selectors: [[\"\", \"cdkAriaLive\", \"\"]],\n inputs: {\n politeness: [0, \"cdkAriaLive\", \"politeness\"],\n duration: [0, \"cdkAriaLiveDuration\", \"duration\"]\n },\n exportAs: [\"cdkAriaLive\"],\n standalone: true\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkAriaLive, [{\n type: Directive,\n args: [{\n selector: '[cdkAriaLive]',\n exportAs: 'cdkAriaLive',\n standalone: true\n }]\n }], () => [{\n type: i0.ElementRef\n }, {\n type: LiveAnnouncer\n }, {\n type: i1$1.ContentObserver\n }, {\n type: i0.NgZone\n }], {\n politeness: [{\n type: Input,\n args: ['cdkAriaLive']\n }],\n duration: [{\n type: Input,\n args: ['cdkAriaLiveDuration']\n }]\n });\n})();\n\n/** Detection mode used for attributing the origin of a focus event. */\nvar FocusMonitorDetectionMode;\n(function (FocusMonitorDetectionMode) {\n /**\n * Any mousedown, keydown, or touchstart event that happened in the previous\n * tick or the current tick will be used to assign a focus event's origin (to\n * either mouse, keyboard, or touch). This is the default option.\n */\n FocusMonitorDetectionMode[FocusMonitorDetectionMode[\"IMMEDIATE\"] = 0] = \"IMMEDIATE\";\n /**\n * A focus event's origin is always attributed to the last corresponding\n * mousedown, keydown, or touchstart event, no matter how long ago it occurred.\n */\n FocusMonitorDetectionMode[FocusMonitorDetectionMode[\"EVENTUAL\"] = 1] = \"EVENTUAL\";\n})(FocusMonitorDetectionMode || (FocusMonitorDetectionMode = {}));\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, _inputModalityDetector, /** @breaking-change 11.0.0 make document required */\n document, options) {\n this._ngZone = _ngZone;\n this._platform = _platform;\n this._inputModalityDetector = _inputModalityDetector;\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 /**\n * Whether the origin was determined via a touch interaction. Necessary as properly attributing\n * focus events to touch interactions requires special logic.\n */\n this._originFromTouchInteraction = 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 `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 = window.setTimeout(() => this._windowFocused = false);\n };\n /** Subject for stopping our InputModalityDetector subscription. */\n this._stopInputModalityDetector = new Subject();\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 = _getEventTarget(event);\n // We need to walk up the ancestor chain in order to support `checkChildren`.\n for (let element = target; element; element = element.parentElement) {\n if (event.type === 'focus') {\n this._onFocus(event, element);\n } else {\n this._onBlur(event, element);\n }\n }\n };\n this._document = document;\n this._detectionMode = (options === null || options === void 0 ? void 0 : options.detectionMode) || FocusMonitorDetectionMode.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 // Note: we don't want the observable to emit at all so we don't pass any parameters.\n return of();\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._setOrigin(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 _getFocusOrigin(focusEventTarget) {\n if (this._origin) {\n // If the origin was realized via a touch interaction, we need to perform additional checks\n // to determine whether the focus origin should be attributed to touch or program.\n if (this._originFromTouchInteraction) {\n return this._shouldBeAttributedToTouch(focusEventTarget) ? 'touch' : 'program';\n } else {\n return this._origin;\n }\n }\n // If the window has just regained focus, we can restore the most recent origin from before the\n // window blurred. Otherwise, we've reached the point where we can't identify the source of the\n // focus. This typically means one of two things happened:\n //\n // 1) The element was programmatically focused, or\n // 2) The element was focused via screen reader navigation (which generally doesn't fire\n // events).\n //\n // Because we can't distinguish between these two cases, we default to setting `program`.\n if (this._windowFocused && this._lastFocusOrigin) {\n return this._lastFocusOrigin;\n }\n // If the interaction is coming from an input label, we consider it a mouse interactions.\n // This is a special case where focus moves on `click`, rather than `mousedown` which breaks\n // our detection, because all our assumptions are for `mousedown`. We need to handle this\n // special case, because it's very common for checkboxes and radio buttons.\n if (focusEventTarget && this._isLastInteractionFromInputLabel(focusEventTarget)) {\n return 'mouse';\n }\n return 'program';\n }\n /**\n * Returns whether the focus event should be attributed to touch. Recall that in IMMEDIATE mode, a\n * touch origin isn't immediately reset at the next tick (see _setOrigin). This means that when we\n * handle a focus event following a touch interaction, we need to determine whether (1) the focus\n * event was directly caused by the touch interaction or (2) the focus event was caused by a\n * subsequent programmatic focus call triggered by the touch interaction.\n * @param focusEventTarget The target of the focus event under examination.\n */\n _shouldBeAttributedToTouch(focusEventTarget) {\n // Please note that this check is not perfect. Consider the following edge case:\n //\n // <div #parent tabindex=\"0\">\n // <div #child tabindex=\"0\" (click)=\"#parent.focus()\"></div>\n // </div>\n //\n // Suppose there is a FocusMonitor in IMMEDIATE mode attached to #parent. When the user touches\n // #child, #parent is programmatically focused. This code will attribute the focus to touch\n // instead of program. This is a relatively minor edge-case that can be worked around by using\n // focusVia(parent, 'program') to focus #parent.\n return this._detectionMode === FocusMonitorDetectionMode.EVENTUAL || !!(focusEventTarget !== null && focusEventTarget !== void 0 && focusEventTarget.contains(this._inputModalityDetector._mostRecentTarget));\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 element.classList.toggle('cdk-focused', !!origin);\n element.classList.toggle('cdk-touch-focused', origin === 'touch');\n element.classList.toggle('cdk-keyboard-focused', origin === 'keyboard');\n element.classList.toggle('cdk-mouse-focused', origin === 'mouse');\n element.classList.toggle('cdk-program-focused', origin === 'program');\n }\n /**\n * Updates the focus origin. If we're using immediate detection mode, we schedule an async\n * function to clear the origin at the end of a timeout. The duration of the timeout depends on\n * the origin being set.\n * @param origin The origin to set.\n * @param isFromInteraction Whether we are setting the origin from an interaction event.\n */\n _setOrigin(origin, isFromInteraction = false) {\n this._ngZone.runOutsideAngular(() => {\n this._origin = origin;\n this._originFromTouchInteraction = origin === 'touch' && isFromInteraction;\n // If we're in IMMEDIATE mode, reset the origin at the next tick (or in `TOUCH_BUFFER_MS` ms\n // for a touch event). We reset the origin at the next tick because Firefox focuses one tick\n // after the interaction event. We wait `TOUCH_BUFFER_MS` ms before resetting the origin for\n // a touch event because when a touch event is fired, the associated focus event isn't yet in\n // the event queue. Before doing so, clear any pending timeouts.\n if (this._detectionMode === FocusMonitorDetectionMode.IMMEDIATE) {\n clearTimeout(this._originTimeoutId);\n const ms = this._originFromTouchInteraction ? TOUCH_BUFFER_MS : 1;\n this._originTimeoutId = setTimeout(() => this._origin = null, ms);\n }\n });\n }\n /**\n * 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 const focusEventTarget = _getEventTarget(event);\n if (!elementInfo || !elementInfo.checkChildren && element !== focusEventTarget) {\n return;\n }\n this._originChanged(element, this._getFocusOrigin(focusEventTarget), 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 && element.contains(event.relatedTarget)) {\n return;\n }\n this._setClasses(element);\n this._emitOrigin(elementInfo, null);\n }\n _emitOrigin(info, origin) {\n if (info.subject.observers.length) {\n this._ngZone.run(() => info.subject.next(origin));\n }\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 window = this._getWindow();\n window.addEventListener('focus', this._windowFocusListener);\n });\n // The InputModalityDetector is also just a collection of global listeners.\n this._inputModalityDetector.modalityDetected.pipe(takeUntil(this._stopInputModalityDetector)).subscribe(modality => {\n this._setOrigin(modality, true /* isFromInteraction */);\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 window = this._getWindow();\n window.removeEventListener('focus', this._windowFocusListener);\n // Equivalently, stop our InputModalityDetector subscription.\n this._stopInputModalityDetector.next();\n // Clear timeouts for all potentially pending timeouts to prevent the leaks.\n clearTimeout(this._windowFocusTimeoutId);\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, 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 /**\n * Returns whether an interaction is likely to have come from the user clicking the `label` of\n * an `input` or `textarea` in order to focus it.\n * @param focusEventTarget Target currently receiving focus.\n */\n _isLastInteractionFromInputLabel(focusEventTarget) {\n const {\n _mostRecentTarget: mostRecentTarget,\n mostRecentModality\n } = this._inputModalityDetector;\n // If the last interaction used the mouse on an element contained by one of the labels\n // of an `input`/`textarea` that is currently focused, it is very likely that the\n // user redirected focus using the label.\n if (mostRecentModality !== 'mouse' || !mostRecentTarget || mostRecentTarget === focusEventTarget || focusEventTarget.nodeName !== 'INPUT' && focusEventTarget.nodeName !== 'TEXTAREA' || focusEventTarget.disabled) {\n return false;\n }\n const labels = focusEventTarget.labels;\n if (labels) {\n for (let i = 0; i < labels.length; i++) {\n if (labels[i].contains(mostRecentTarget)) {\n return true;\n }\n }\n }\n return false;\n }\n}\n_FocusMonitor = FocusMonitor;\n_FocusMonitor.ɵfac = function _FocusMonitor_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _FocusMonitor)(i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(i1.Platform), i0.ɵɵinject(InputModalityDetector), i0.ɵɵinject(DOCUMENT, 8), i0.ɵɵinject(FOCUS_MONITOR_DEFAULT_OPTIONS, 8));\n};\n_FocusMonitor.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n token: _FocusMonitor,\n factory: _FocusMonitor.ɵfac,\n providedIn: 'root'\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(FocusMonitor, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], () => [{\n type: i0.NgZone\n }, {\n type: i1.Platform\n }, {\n type: InputModalityDetector\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 }], null);\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._focusOrigin = null;\n this.cdkFocusChange = new EventEmitter();\n }\n get focusOrigin() {\n return this._focusOrigin;\n }\n ngAfterViewInit() {\n const element = this._elementRef.nativeElement;\n this._monitorSubscription = this._focusMonitor.monitor(element, element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus')).subscribe(origin => {\n this._focusOrigin = origin;\n this.cdkFocusChange.emit(origin);\n });\n }\n ngOnDestroy() {\n this._focusMonitor.stopMonitoring(this._elementRef);\n if (this._monitorSubscription) {\n this._monitorSubscription.unsubscribe();\n }\n }\n}\n_CdkMonitorFocus = CdkMonitorFocus;\n_CdkMonitorFocus.ɵfac = function _CdkMonitorFocus_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _CdkMonitorFocus)(i0.ɵɵdirectiveInject(i0.ElementRef), i0.ɵɵdirectiveInject(FocusMonitor));\n};\n_CdkMonitorFocus.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n type: _CdkMonitorFocus,\n selectors: [[\"\", \"cdkMonitorElementFocus\", \"\"], [\"\", \"cdkMonitorSubtreeFocus\", \"\"]],\n outputs: {\n cdkFocusChange: \"cdkFocusChange\"\n },\n exportAs: [\"cdkMonitorFocus\"],\n standalone: true\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkMonitorFocus, [{\n type: Directive,\n args: [{\n selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',\n exportAs: 'cdkMonitorFocus',\n standalone: true\n }]\n }], () => [{\n type: i0.ElementRef\n }, {\n type: FocusMonitor\n }], {\n cdkFocusChange: [{\n type: Output\n }]\n });\n})();\n\n/** Set of possible high-contrast mode backgrounds. */\nvar HighContrastMode;\n(function (HighContrastMode) {\n HighContrastMode[HighContrastMode[\"NONE\"] = 0] = \"NONE\";\n HighContrastMode[HighContrastMode[\"BLACK_ON_WHITE\"] = 1] = \"BLACK_ON_WHITE\";\n HighContrastMode[HighContrastMode[\"WHITE_ON_BLACK\"] = 2] = \"WHITE_ON_BLACK\";\n})(HighContrastMode || (HighContrastMode = {}));\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 this._breakpointSubscription = inject(BreakpointObserver).observe('(forced-colors: active)').subscribe(() => {\n if (this._hasCheckedHighContrastMode) {\n this._hasCheckedHighContrastMode = false;\n this._applyBodyHighContrastModeCssClasses();\n }\n });\n }\n /** Gets the current high-contrast-mode for the page. */\n getHighContrastMode() {\n if (!this._platform.isBrowser) {\n return HighContrastMode.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 testElement.remove();\n switch (computedColor) {\n // Pre Windows 11 dark theme.\n case 'rgb(0,0,0)':\n // Windows 11 dark themes.\n case 'rgb(45,50,54)':\n case 'rgb(32,32,32)':\n return HighContrastMode.WHITE_ON_BLACK;\n // Pre Windows 11 light theme.\n case 'rgb(255,255,255)':\n // Windows 11 light theme.\n case 'rgb(255,250,239)':\n return HighContrastMode.BLACK_ON_WHITE;\n }\n return HighContrastMode.NONE;\n }\n ngOnDestroy() {\n this._breakpointSubscription.unsubscribe();\n }\n /** Applies CSS classes indicating high-contrast mode to document body (browser-only). */\n _applyBodyHighContrastModeCssClasses() {\n if (!this._hasCheckedHighContrastMode && this._platform.isBrowser && this._document.body) {\n const bodyClasses = this._document.body.classList;\n bodyClasses.remove(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, BLACK_ON_WHITE_CSS_CLASS, WHITE_ON_BLACK_CSS_CLASS);\n this._hasCheckedHighContrastMode = true;\n const mode = this.getHighContrastMode();\n if (mode === HighContrastMode.BLACK_ON_WHITE) {\n bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, BLACK_ON_WHITE_CSS_CLASS);\n } else if (mode === HighContrastMode.WHITE_ON_BLACK) {\n bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, WHITE_ON_BLACK_CSS_CLASS);\n }\n }\n }\n}\n_HighContrastModeDetector = HighContrastModeDetector;\n_HighContrastModeDetector.ɵfac = function _HighContrastModeDetector_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _HighContrastModeDetector)(i0.ɵɵinject(i1.Platform), i0.ɵɵinject(DOCUMENT));\n};\n_HighContrastModeDetector.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n token: _HighContrastModeDetector,\n factory: _HighContrastModeDetector.ɵfac,\n providedIn: 'root'\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(HighContrastModeDetector, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], () => [{\n type: i1.Platform\n }, {\n type: undefined,\n decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }]\n }], null);\n})();\nclass A11yModule {\n constructor(highContrastModeDetector) {\n highContrastModeDetector._applyBodyHighContrastModeCssClasses();\n }\n}\n_A11yModule = A11yModule;\n_A11yModule.ɵfac = function _A11yModule_Factory(__ngFactoryType__) {\n return new (__ngFactoryType__ || _A11yModule)(i0.ɵɵinject(HighContrastModeDetector));\n};\n_A11yModule.ɵmod = /* @__PURE__ */i0.ɵɵdefineNgModule({\n type: _A11yModule\n});\n_A11yModule.ɵinj = /* @__PURE__ */i0.ɵɵdefineInjector({\n imports: [ObserversModule]\n});\n(() => {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(A11yModule, [{\n type: NgModule,\n args: [{\n imports: [ObserversModule, CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],\n exports: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus]\n }]\n }], () => [{\n type: HighContrastModeDetector\n }], null);\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, FocusMonitorDetectionMode, FocusTrap, FocusTrapFactory, HighContrastMode, HighContrastModeDetector, INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS, INPUT_MODALITY_DETECTOR_OPTIONS, InputModalityDetector, InteractivityChecker, IsFocusableConfig, LIVE_ANNOUNCER_DEFAULT_OPTIONS, LIVE_ANNOUNCER_ELEMENT_TOKEN, LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY, ListKeyManager, LiveAnnouncer, MESSAGES_CONTAINER_ID, NOOP_TREE_KEY_MANAGER_FACTORY, NOOP_TREE_KEY_MANAGER_FACTORY_PROVIDER, NoopTreeKeyManager, TREE_KEY_MANAGER, TREE_KEY_MANAGER_FACTORY, TREE_KEY_MANAGER_FACTORY_PROVIDER, TreeKeyManager, addAriaReferencedId, getAriaReferenceIds, isFakeMousedownFromScreenReader, isFakeTouchstartFromScreenReader, removeAriaReferencedId 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{ DOCUMENT } from '@angular/common';\nimport * as i0 from '@angular/core';\nimport { inject, APP_ID, Injectable, Inject, signal, QueryList, isSignal, effect, InjectionToken, afterNextRender, Injector, booleanAttribute, Directive, Input, Optional, EventEmitter, Output, NgModule } from '@angular/core';\nimport * as i1 from '@angular/cdk/platform';\nimport { Platform, _getFocusedElementPierceShadowDom, normalizePassiveListenerOptions, _getEventTarget, _getShadowRoot } from '@angular/cdk/platform';\nimport { A, Z, ZERO, NINE, hasModifierKey, PAGE_DOWN, PAGE_UP, END, HOME, LEFT_ARROW, RIGHT_ARROW, UP_ARROW, DOWN_ARROW, TAB, ALT, CONTROL, MAC_META, META, SHIFT } from '@angular/cdk/keycodes';\nimport { Subject, Subscription, isObservable, of, BehaviorSubject } from 'rxjs';\nimport { tap, debounceTime, filter, map, take, skip, distinctUntilChanged, takeUntil } from 'rxjs/operators';\nimport { coerceObservable } from '@angular/cdk/coercion/private';\nimport * as i1$1 from '@angular/cdk/observers';\nimport { ObserversModule } from '@angular/cdk/observers';\nimport { coerceElement } from '@angular/cdk/coercion';\nimport { BreakpointObserver } from '@angular/cdk/layout';\n\n/** IDs are delimited by an empty space, as per the spec. */\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 id = id.trim();\n if (ids.some(existingId => existingId.trim() === id)) {\n return;\n }\n ids.push(id);\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 id = id.trim();\n const filteredIds = ids.filter(val => val !== id);\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 const attrValue = el.getAttribute(attr);\n return attrValue?.match(/\\S+/g) ?? [];\n}\n\n/**\n * ID used for the body container where all messages are appended.\n * @deprecated No longer being used. To be removed.\n * @breaking-change 14.0.0\n */\nconst MESSAGES_CONTAINER_ID = 'cdk-describedby-message-container';\n/**\n * ID prefix used for each created message element.\n * @deprecated To be turned into a private variable.\n * @breaking-change 14.0.0\n */\nconst CDK_DESCRIBEDBY_ID_PREFIX = 'cdk-describedby-message';\n/**\n * Attribute given to each host element that is described by a message element.\n * @deprecated To be turned into a private variable.\n * @breaking-change 14.0.0\n */\nconst CDK_DESCRIBEDBY_HOST_ATTRIBUTE = 'cdk-describedby-host';\n/** Global incremental identifier for each registered message element. */\nlet nextId = 0;\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 /**\n * @deprecated To be turned into a required parameter.\n * @breaking-change 14.0.0\n */\n _platform) {\n this._platform = _platform;\n /** Map of all registered message elements that have been placed into the document. */\n this._messageRegistry = new Map();\n /** Container for all registered messages. */\n this._messagesContainer = null;\n /** Unique ID for the service. */\n this._id = `${nextId++}`;\n this._document = _document;\n this._id = inject(APP_ID) + '-' + nextId++;\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, this._id);\n this._messageRegistry.set(key, { messageElement: message, referenceCount: 0 });\n }\n else if (!this._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 = this._messageRegistry.get(key);\n if (registeredMessage && registeredMessage.referenceCount === 0) {\n this._deleteMessageElement(key);\n }\n }\n if (this._messagesContainer?.childNodes.length === 0) {\n this._messagesContainer.remove();\n this._messagesContainer = null;\n }\n }\n /** Unregisters all created message elements and removes the message container. */\n ngOnDestroy() {\n const describedElements = this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}=\"${this._id}\"]`);\n for (let i = 0; i < describedElements.length; i++) {\n this._removeCdkDescribedByReferenceIds(describedElements[i]);\n describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n }\n this._messagesContainer?.remove();\n this._messagesContainer = null;\n this._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, this._id);\n messageElement.textContent = message;\n if (role) {\n messageElement.setAttribute('role', role);\n }\n this._createMessagesContainer();\n this._messagesContainer.appendChild(messageElement);\n this._messageRegistry.set(getKey(message, role), { messageElement, referenceCount: 0 });\n }\n /** Deletes the message element from the global messages container. */\n _deleteMessageElement(key) {\n this._messageRegistry.get(key)?.messageElement?.remove();\n this._messageRegistry.delete(key);\n }\n /** Creates the global container for all aria-describedby messages. */\n _createMessagesContainer() {\n if (this._messagesContainer) {\n return;\n }\n const containerClassName = 'cdk-describedby-message-container';\n const serverContainers = this._document.querySelectorAll(`.${containerClassName}[platform=\"server\"]`);\n for (let i = 0; i < serverContainers.length; i++) {\n // When going from the server to the client, we may end up in a situation where there's\n // already a container on the page, but we don't have a reference to it. Clear the\n // old container so we don't get duplicates. Doing this, instead of emptying the previous\n // container, should be slightly faster.\n serverContainers[i].remove();\n }\n const messagesContainer = this._document.createElement('div');\n // We add `visibility: hidden` in order to prevent text in this container from\n // being searchable by the browser's Ctrl + F functionality.\n // Screen-readers will still read the description for elements with aria-describedby even\n // when the description element is not visible.\n messagesContainer.style.visibility = 'hidden';\n // Even though we use `visibility: hidden`, we still apply `cdk-visually-hidden` so that\n // the description element doesn't impact page layout.\n messagesContainer.classList.add(containerClassName);\n messagesContainer.classList.add('cdk-visually-hidden');\n // @breaking-change 14.0.0 Remove null check for `_platform`.\n if (this._platform && !this._platform.isBrowser) {\n messagesContainer.setAttribute('platform', 'server');\n }\n this._document.body.appendChild(messagesContainer);\n this._messagesContainer = messagesContainer;\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 = this._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, this._id);\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 = this._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 = this._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 static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: AriaDescriber, deps: [{ token: DOCUMENT }, { token: i1.Platform }], target: i0.ɵɵFactoryTarget.Injectable }); }\n static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: AriaDescriber, providedIn: 'root' }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: AriaDescriber, decorators: [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], ctorParameters: () => [{ type: undefined, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }, { type: i1.Platform }] });\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, serviceId) {\n if (!element.id) {\n element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${serviceId}-${nextId++}`;\n }\n}\n\nconst DEFAULT_TYPEAHEAD_DEBOUNCE_INTERVAL_MS = 200;\n/**\n * Selects items based on keyboard inputs. Implements the typeahead functionality of\n * `role=\"listbox\"` or `role=\"tree\"` and other related roles.\n */\nclass Typeahead {\n constructor(initialItems, config) {\n this._letterKeyStream = new Subject();\n this._items = [];\n this._selectedItemIndex = -1;\n /** Buffer for the letters that the user has pressed */\n this._pressedLetters = [];\n this._selectedItem = new Subject();\n this.selectedItem = this._selectedItem;\n const typeAheadInterval = typeof config?.debounceInterval === 'number'\n ? config.debounceInterval\n : DEFAULT_TYPEAHEAD_DEBOUNCE_INTERVAL_MS;\n if (config?.skipPredicate) {\n this._skipPredicateFn = config.skipPredicate;\n }\n if ((typeof ngDevMode === 'undefined' || ngDevMode) &&\n initialItems.length &&\n initialItems.some(item => typeof item.getLabel !== 'function')) {\n throw new Error('KeyManager items in typeahead mode must implement the `getLabel` method.');\n }\n this.setItems(initialItems);\n this._setupKeyHandler(typeAheadInterval);\n }\n destroy() {\n this._pressedLetters = [];\n this._letterKeyStream.complete();\n this._selectedItem.complete();\n }\n setCurrentSelectedItemIndex(index) {\n this._selectedItemIndex = index;\n }\n setItems(items) {\n this._items = items;\n }\n handleKey(event) {\n const keyCode = event.keyCode;\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 /** Gets whether the user is currently typing into the manager using the typeahead feature. */\n isTyping() {\n return this._pressedLetters.length > 0;\n }\n /** Resets the currently stored sequence of typed letters. */\n reset() {\n this._pressedLetters = [];\n }\n _setupKeyHandler(typeAheadInterval) {\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._letterKeyStream\n .pipe(tap(letter => this._pressedLetters.push(letter)), debounceTime(typeAheadInterval), filter(() => this._pressedLetters.length > 0), map(() => this._pressedLetters.join('').toLocaleUpperCase()))\n .subscribe(inputString => {\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 < this._items.length + 1; i++) {\n const index = (this._selectedItemIndex + i) % this._items.length;\n const item = this._items[index];\n if (!this._skipPredicateFn?.(item) &&\n item.getLabel?.().toLocaleUpperCase().trim().indexOf(inputString) === 0) {\n this._selectedItem.next(item);\n break;\n }\n }\n this._pressedLetters = [];\n });\n }\n}\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, injector) {\n this._items = _items;\n this._activeItemIndex = -1;\n this._activeItem = signal(null);\n this._wrap = false;\n this._typeaheadSubscription = Subscription.EMPTY;\n this._vertical = true;\n this._allowedModifierKeys = [];\n this._homeAndEnd = false;\n this._pageUpAndDown = { enabled: false, delta: 10 };\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 /**\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 this._itemChangesSubscription = _items.changes.subscribe((newItems) => this._itemsChanged(newItems.toArray()));\n }\n else if (isSignal(_items)) {\n if (!injector && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n throw new Error('ListKeyManager constructed with a signal must receive an injector');\n }\n this._effectRef = effect(() => this._itemsChanged(_items()), { injector });\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) {\n const items = this._getItemsArray();\n if (items.length > 0 && items.some(item => typeof item.getLabel !== 'function')) {\n throw Error('ListKeyManager items in typeahead mode must implement the `getLabel` method.');\n }\n }\n this._typeaheadSubscription.unsubscribe();\n const items = this._getItemsArray();\n this._typeahead = new Typeahead(items, {\n debounceInterval: typeof debounceInterval === 'number' ? debounceInterval : undefined,\n skipPredicate: item => this._skipPredicateFn(item),\n });\n this._typeaheadSubscription = this._typeahead.selectedItem.subscribe(item => {\n this.setActiveItem(item);\n });\n return this;\n }\n /** Cancels the current typeahead sequence. */\n cancelTypeahead() {\n this._typeahead?.reset();\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 /**\n * Configures the key manager to activate every 10th, configured or first/last element in up/down direction\n * respectively when the Page-Up or Page-Down key is pressed.\n * @param enabled Whether pressing the Page-Up or Page-Down key activates the first/last item.\n * @param delta Whether pressing the Home or End key activates the first/last item.\n */\n withPageUpDown(enabled = true, delta = 10) {\n this._pageUpAndDown = { enabled, delta };\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 case PAGE_UP:\n if (this._pageUpAndDown.enabled && isModifierAllowed) {\n const targetIndex = this._activeItemIndex - this._pageUpAndDown.delta;\n this._setActiveItemByIndex(targetIndex > 0 ? targetIndex : 0, 1);\n break;\n }\n else {\n return;\n }\n case PAGE_DOWN:\n if (this._pageUpAndDown.enabled && isModifierAllowed) {\n const targetIndex = this._activeItemIndex + this._pageUpAndDown.delta;\n const itemsLength = this._getItemsArray().length;\n this._setActiveItemByIndex(targetIndex < itemsLength ? targetIndex : itemsLength - 1, -1);\n break;\n }\n else {\n return;\n }\n default:\n if (isModifierAllowed || hasModifierKey(event, 'shiftKey')) {\n this._typeahead?.handleKey(event);\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._typeahead?.reset();\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._typeahead && this._typeahead.isTyping();\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._getItemsArray().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\n ? 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.set(activeItem == null ? null : activeItem);\n this._activeItemIndex = index;\n this._typeahead?.setCurrentSelectedItemIndex(index);\n }\n /** Cleans up the key manager. */\n destroy() {\n this._typeaheadSubscription.unsubscribe();\n this._itemChangesSubscription?.unsubscribe();\n this._effectRef?.destroy();\n this._typeahead?.destroy();\n this.tabOut.complete();\n this.change.complete();\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 if (isSignal(this._items)) {\n return this._items();\n }\n return this._items instanceof QueryList ? this._items.toArray() : this._items;\n }\n /** Callback for when the items have changed. */\n _itemsChanged(newItems) {\n this._typeahead?.setItems(newItems);\n const activeItem = this._activeItem();\n if (activeItem) {\n const newIndex = newItems.indexOf(activeItem);\n if (newIndex > -1 && newIndex !== this._activeItemIndex) {\n this._activeItemIndex = newIndex;\n this._typeahead?.setCurrentSelectedItemIndex(newIndex);\n }\n }\n }\n}\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\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 * This class manages keyboard events for trees. If you pass it a QueryList or other list of tree\n * items, it will set the active item, focus, handle expansion and typeahead correctly when\n * keyboard events occur.\n */\nclass TreeKeyManager {\n _initializeFocus() {\n if (this._hasInitialFocused || this._items.length === 0) {\n return;\n }\n let activeIndex = 0;\n for (let i = 0; i < this._items.length; i++) {\n if (!this._skipPredicateFn(this._items[i]) && !this._isItemDisabled(this._items[i])) {\n activeIndex = i;\n break;\n }\n }\n const activeItem = this._items[activeIndex];\n // Use `makeFocusable` here, because we want the item to just be focusable, not actually\n // capture the focus since the user isn't interacting with it. See #29628.\n if (activeItem.makeFocusable) {\n this._activeItem?.unfocus();\n this._activeItemIndex = activeIndex;\n this._activeItem = activeItem;\n this._typeahead?.setCurrentSelectedItemIndex(activeIndex);\n activeItem.makeFocusable();\n }\n else {\n // Backwards compatibility for items that don't implement `makeFocusable`.\n this.focusItem(activeIndex);\n }\n this._hasInitialFocused = true;\n }\n /**\n *\n * @param items List of TreeKeyManager options. Can be synchronous or asynchronous.\n * @param config Optional configuration options. By default, use 'ltr' horizontal orientation. By\n * default, do not skip any nodes. By default, key manager only calls `focus` method when items\n * are focused and does not call `activate`. If `typeaheadDefaultInterval` is `true`, use a\n * default interval of 200ms.\n */\n constructor(items, config) {\n /** The index of the currently active (focused) item. */\n this._activeItemIndex = -1;\n /** The currently active (focused) item. */\n this._activeItem = null;\n /** Whether or not we activate the item when it's focused. */\n this._shouldActivationFollowFocus = false;\n /**\n * The orientation that the tree is laid out in. In `rtl` mode, the behavior of Left and\n * Right arrow are switched.\n */\n this._horizontalOrientation = 'ltr';\n /**\n * Predicate function that can be used to check whether an item should be skipped\n * by the key manager.\n *\n * The default value for this doesn't skip any elements in order to keep tree items focusable\n * when disabled. This aligns with ARIA guidelines:\n * https://www.w3.org/WAI/ARIA/apg/practices/keyboard-interface/#focusabilityofdisabledcontrols.\n */\n this._skipPredicateFn = (_item) => false;\n /** Function to determine equivalent items. */\n this._trackByFn = (item) => item;\n /** Synchronous cache of the items to manage. */\n this._items = [];\n this._typeaheadSubscription = Subscription.EMPTY;\n this._hasInitialFocused = false;\n /** Stream that emits any time the focused item changes. */\n this.change = new Subject();\n // We allow for the items to be an array or Observable because, in some cases, the consumer may\n // not have access to a QueryList of the items they want to manage (e.g. when the\n // items aren't being collected via `ViewChildren` or `ContentChildren`).\n if (items instanceof QueryList) {\n this._items = items.toArray();\n items.changes.subscribe((newItems) => {\n this._items = newItems.toArray();\n this._typeahead?.setItems(this._items);\n this._updateActiveItemIndex(this._items);\n this._initializeFocus();\n });\n }\n else if (isObservable(items)) {\n items.subscribe(newItems => {\n this._items = newItems;\n this._typeahead?.setItems(newItems);\n this._updateActiveItemIndex(newItems);\n this._initializeFocus();\n });\n }\n else {\n this._items = items;\n this._initializeFocus();\n }\n if (typeof config.shouldActivationFollowFocus === 'boolean') {\n this._shouldActivationFollowFocus = config.shouldActivationFollowFocus;\n }\n if (config.horizontalOrientation) {\n this._horizontalOrientation = config.horizontalOrientation;\n }\n if (config.skipPredicate) {\n this._skipPredicateFn = config.skipPredicate;\n }\n if (config.trackBy) {\n this._trackByFn = config.trackBy;\n }\n if (typeof config.typeAheadDebounceInterval !== 'undefined') {\n this._setTypeAhead(config.typeAheadDebounceInterval);\n }\n }\n /** Cleans up the key manager. */\n destroy() {\n this._typeaheadSubscription.unsubscribe();\n this._typeahead?.destroy();\n this.change.complete();\n }\n /**\n * Handles a keyboard event on the tree.\n * @param event Keyboard event that represents the user interaction with the tree.\n */\n onKeydown(event) {\n const key = event.key;\n switch (key) {\n case 'Tab':\n // Return early here, in order to allow Tab to actually tab out of the tree\n return;\n case 'ArrowDown':\n this._focusNextItem();\n break;\n case 'ArrowUp':\n this._focusPreviousItem();\n break;\n case 'ArrowRight':\n this._horizontalOrientation === 'rtl'\n ? this._collapseCurrentItem()\n : this._expandCurrentItem();\n break;\n case 'ArrowLeft':\n this._horizontalOrientation === 'rtl'\n ? this._expandCurrentItem()\n : this._collapseCurrentItem();\n break;\n case 'Home':\n this._focusFirstItem();\n break;\n case 'End':\n this._focusLastItem();\n break;\n case 'Enter':\n case ' ':\n this._activateCurrentItem();\n break;\n default:\n if (event.key === '*') {\n this._expandAllItemsAtCurrentItemLevel();\n break;\n }\n this._typeahead?.handleKey(event);\n // Return here, in order to avoid preventing the default action of non-navigational\n // keys or resetting the buffer of pressed letters.\n return;\n }\n // Reset the typeahead since the user has used a navigational key.\n this._typeahead?.reset();\n event.preventDefault();\n }\n /** Index of the currently active item. */\n getActiveItemIndex() {\n return this._activeItemIndex;\n }\n /** The currently active item. */\n getActiveItem() {\n return this._activeItem;\n }\n /** Focus the first available item. */\n _focusFirstItem() {\n this.focusItem(this._findNextAvailableItemIndex(-1));\n }\n /** Focus the last available item. */\n _focusLastItem() {\n this.focusItem(this._findPreviousAvailableItemIndex(this._items.length));\n }\n /** Focus the next available item. */\n _focusNextItem() {\n this.focusItem(this._findNextAvailableItemIndex(this._activeItemIndex));\n }\n /** Focus the previous available item. */\n _focusPreviousItem() {\n this.focusItem(this._findPreviousAvailableItemIndex(this._activeItemIndex));\n }\n focusItem(itemOrIndex, options = {}) {\n // Set default options\n options.emitChangeEvent ??= true;\n let index = typeof itemOrIndex === 'number'\n ? itemOrIndex\n : this._items.findIndex(item => this._trackByFn(item) === this._trackByFn(itemOrIndex));\n if (index < 0 || index >= this._items.length) {\n return;\n }\n const activeItem = this._items[index];\n // If we're just setting the same item, don't re-call activate or focus\n if (this._activeItem !== null &&\n this._trackByFn(activeItem) === this._trackByFn(this._activeItem)) {\n return;\n }\n const previousActiveItem = this._activeItem;\n this._activeItem = activeItem ?? null;\n this._activeItemIndex = index;\n this._typeahead?.setCurrentSelectedItemIndex(index);\n this._activeItem?.focus();\n previousActiveItem?.unfocus();\n if (options.emitChangeEvent) {\n this.change.next(this._activeItem);\n }\n if (this._shouldActivationFollowFocus) {\n this._activateCurrentItem();\n }\n }\n _updateActiveItemIndex(newItems) {\n const activeItem = this._activeItem;\n if (!activeItem) {\n return;\n }\n const newIndex = newItems.findIndex(item => this._trackByFn(item) === this._trackByFn(activeItem));\n if (newIndex > -1 && newIndex !== this._activeItemIndex) {\n this._activeItemIndex = newIndex;\n this._typeahead?.setCurrentSelectedItemIndex(newIndex);\n }\n }\n _setTypeAhead(debounceInterval) {\n this._typeahead = new Typeahead(this._items, {\n debounceInterval: typeof debounceInterval === 'number' ? debounceInterval : undefined,\n skipPredicate: item => this._skipPredicateFn(item),\n });\n this._typeaheadSubscription = this._typeahead.selectedItem.subscribe(item => {\n this.focusItem(item);\n });\n }\n _findNextAvailableItemIndex(startingIndex) {\n for (let i = startingIndex + 1; i < this._items.length; i++) {\n if (!this._skipPredicateFn(this._items[i])) {\n return i;\n }\n }\n return startingIndex;\n }\n _findPreviousAvailableItemIndex(startingIndex) {\n for (let i = startingIndex - 1; i >= 0; i--) {\n if (!this._skipPredicateFn(this._items[i])) {\n return i;\n }\n }\n return startingIndex;\n }\n /**\n * If the item is already expanded, we collapse the item. Otherwise, we will focus the parent.\n */\n _collapseCurrentItem() {\n if (!this._activeItem) {\n return;\n }\n if (this._isCurrentItemExpanded()) {\n this._activeItem.collapse();\n }\n else {\n const parent = this._activeItem.getParent();\n if (!parent || this._skipPredicateFn(parent)) {\n return;\n }\n this.focusItem(parent);\n }\n }\n /**\n * If the item is already collapsed, we expand the item. Otherwise, we will focus the first child.\n */\n _expandCurrentItem() {\n if (!this._activeItem) {\n return;\n }\n if (!this._isCurrentItemExpanded()) {\n this._activeItem.expand();\n }\n else {\n coerceObservable(this._activeItem.getChildren())\n .pipe(take(1))\n .subscribe(children => {\n const firstChild = children.find(child => !this._skipPredicateFn(child));\n if (!firstChild) {\n return;\n }\n this.focusItem(firstChild);\n });\n }\n }\n _isCurrentItemExpanded() {\n if (!this._activeItem) {\n return false;\n }\n return typeof this._activeItem.isExpanded === 'boolean'\n ? this._activeItem.isExpanded\n : this._activeItem.isExpanded();\n }\n _isItemDisabled(item) {\n return typeof item.isDisabled === 'boolean' ? item.isDisabled : item.isDisabled?.();\n }\n /** For all items that are the same level as the current item, we expand those items. */\n _expandAllItemsAtCurrentItemLevel() {\n if (!this._activeItem) {\n return;\n }\n const parent = this._activeItem.getParent();\n let itemsToExpand;\n if (!parent) {\n itemsToExpand = of(this._items.filter(item => item.getParent() === null));\n }\n else {\n itemsToExpand = coerceObservable(parent.getChildren());\n }\n itemsToExpand.pipe(take(1)).subscribe(items => {\n for (const item of items) {\n item.expand();\n }\n });\n }\n _activateCurrentItem() {\n this._activeItem?.activate();\n }\n}\n/** @docs-private */\nfunction TREE_KEY_MANAGER_FACTORY() {\n return (items, options) => new TreeKeyManager(items, options);\n}\n/** Injection token that determines the key manager to use. */\nconst TREE_KEY_MANAGER = new InjectionToken('tree-key-manager', {\n providedIn: 'root',\n factory: TREE_KEY_MANAGER_FACTORY,\n});\n/** @docs-private */\nconst TREE_KEY_MANAGER_FACTORY_PROVIDER = {\n provide: TREE_KEY_MANAGER,\n useFactory: TREE_KEY_MANAGER_FACTORY,\n};\n\n// NoopTreeKeyManager is a \"noop\" implementation of TreeKeyMangerStrategy. Methods are noops. Does\n// not emit to streams.\n//\n// Used for applications built before TreeKeyManager to opt-out of TreeKeyManager and revert to\n// legacy behavior.\n/**\n * @docs-private\n *\n * Opt-out of Tree of key manager behavior.\n *\n * When provided, Tree has same focus management behavior as before TreeKeyManager was introduced.\n * - Tree does not respond to keyboard interaction\n * - Tree node allows tabindex to be set by Input binding\n * - Tree node allows tabindex to be set by attribute binding\n *\n * @deprecated NoopTreeKeyManager deprecated. Use TreeKeyManager or inject a\n * TreeKeyManagerStrategy instead. To be removed in a future version.\n *\n * @breaking-change 21.0.0\n */\nclass NoopTreeKeyManager {\n constructor() {\n this._isNoopTreeKeyManager = true;\n // Provide change as required by TreeKeyManagerStrategy. NoopTreeKeyManager is a \"noop\"\n // implementation that does not emit to streams.\n this.change = new Subject();\n }\n destroy() {\n this.change.complete();\n }\n onKeydown() {\n // noop\n }\n getActiveItemIndex() {\n // Always return null. NoopTreeKeyManager is a \"noop\" implementation that does not maintain\n // the active item.\n return null;\n }\n getActiveItem() {\n // Always return null. NoopTreeKeyManager is a \"noop\" implementation that does not maintain\n // the active item.\n return null;\n }\n focusItem() {\n // noop\n }\n}\n/**\n * @docs-private\n *\n * Opt-out of Tree of key manager behavior.\n *\n * When provided, Tree has same focus management behavior as before TreeKeyManager was introduced.\n * - Tree does not respond to keyboard interaction\n * - Tree node allows tabindex to be set by Input binding\n * - Tree node allows tabindex to be set by attribute binding\n *\n * @deprecated NoopTreeKeyManager deprecated. Use TreeKeyManager or inject a\n * TreeKeyManagerStrategy instead. To be removed in a future version.\n *\n * @breaking-change 21.0.0\n */\nfunction NOOP_TREE_KEY_MANAGER_FACTORY() {\n return () => new NoopTreeKeyManager();\n}\n/**\n * @docs-private\n *\n * Opt-out of Tree of key manager behavior.\n *\n * When provided, Tree has same focus management behavior as before TreeKeyManager was introduced.\n * - Tree does not respond to keyboard interaction\n * - Tree node allows tabindex to be set by Input binding\n * - Tree node allows tabindex to be set by attribute binding\n *\n * @deprecated NoopTreeKeyManager deprecated. Use TreeKeyManager or inject a\n * TreeKeyManagerStrategy instead. To be removed in a future version.\n *\n * @breaking-change 21.0.0\n */\nconst NOOP_TREE_KEY_MANAGER_FACTORY_PROVIDER = {\n provide: TREE_KEY_MANAGER,\n useFactory: NOOP_TREE_KEY_MANAGER_FACTORY,\n};\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 it 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) &&\n !this.isDisabled(element) &&\n (config?.ignoreVisibility || this.isVisible(element)));\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: InteractivityChecker, deps: [{ token: i1.Platform }], target: i0.ɵɵFactoryTarget.Injectable }); }\n static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: InteractivityChecker, providedIn: 'root' }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: InteractivityChecker, decorators: [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], ctorParameters: () => [{ type: i1.Platform }] });\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 {\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 ||\n 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 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 * 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 */\nclass FocusTrap {\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 constructor(_element, _checker, _ngZone, _document, deferAnchors = false, \n /** @breaking-change 20.0.0 param to become required */\n _injector) {\n this._element = _element;\n this._checker = _checker;\n this._ngZone = _ngZone;\n this._document = _document;\n this._injector = _injector;\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 /** 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 startAnchor.remove();\n }\n if (endAnchor) {\n endAnchor.removeEventListener('focus', this.endAnchorListener);\n endAnchor.remove();\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 focuses the first tabbable element.\n * @returns Returns a promise that resolves with a boolean, depending\n * on whether focus was moved successfully.\n */\n focusInitialElementWhenReady(options) {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusInitialElement(options)));\n });\n }\n /**\n * Waits for the zone to stabilize, then focuses\n * the first tabbable element within the focus trap region.\n * @returns Returns a promise that resolves with a boolean, depending\n * on whether focus was moved successfully.\n */\n focusFirstTabbableElementWhenReady(options) {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusFirstTabbableElement(options)));\n });\n }\n /**\n * Waits for the zone to stabilize, then focuses\n * the last tabbable element within the focus trap region.\n * @returns Returns a promise that resolves with a boolean, depending\n * on whether focus was moved successfully.\n */\n focusLastTabbableElementWhenReady(options) {\n return new Promise(resolve => {\n this._executeOnStable(() => resolve(this.focusLastTabbableElement(options)));\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 const markers = this._element.querySelectorAll(`[cdk-focus-region-${bound}], ` + `[cdkFocusRegion${bound}], ` + `[cdk-focus-${bound}]`);\n if (typeof ngDevMode === 'undefined' || ngDevMode) {\n for (let i = 0; i < markers.length; i++) {\n // @breaking-change 8.0.0\n if (markers[i].hasAttribute(`cdk-focus-${bound}`)) {\n console.warn(`Found use of deprecated attribute 'cdk-focus-${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 }\n if (bound == 'start') {\n return markers.length ? markers[0] : this._getFirstTabbableElement(this._element);\n }\n return markers.length\n ? markers[markers.length - 1]\n : this._getLastTabbableElement(this._element);\n }\n /**\n * Focuses the element that should be focused when the focus trap is initialized.\n * @returns Whether focus was moved successfully.\n */\n focusInitialElement(options) {\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 ((typeof ngDevMode === 'undefined' || ngDevMode) &&\n 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?.focus(options);\n return !!focusableChild;\n }\n redirectToElement.focus(options);\n return true;\n }\n return this.focusFirstTabbableElement(options);\n }\n /**\n * Focuses the first tabbable element within the focus trap region.\n * @returns Whether focus was moved successfully.\n */\n focusFirstTabbableElement(options) {\n const redirectToElement = this._getRegionBoundary('start');\n if (redirectToElement) {\n redirectToElement.focus(options);\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(options) {\n const redirectToElement = this._getRegionBoundary('end');\n if (redirectToElement) {\n redirectToElement.focus(options);\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 const children = root.children;\n for (let i = 0; i < children.length; i++) {\n const 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 const children = root.children;\n for (let i = children.length - 1; i >= 0; i--) {\n const 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 // TODO: remove this conditional when injector is required in the constructor.\n if (this._injector) {\n afterNextRender(fn, { injector: this._injector });\n }\n else {\n setTimeout(fn);\n }\n }\n}\n/**\n * Factory that allows easy instantiation of focus traps.\n */\nclass FocusTrapFactory {\n constructor(_checker, _ngZone, _document) {\n this._checker = _checker;\n this._ngZone = _ngZone;\n this._injector = inject(Injector);\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, this._injector);\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: FocusTrapFactory, deps: [{ token: InteractivityChecker }, { token: i0.NgZone }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable }); }\n static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: FocusTrapFactory, providedIn: 'root' }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: FocusTrapFactory, decorators: [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], ctorParameters: () => [{ type: InteractivityChecker }, { type: i0.NgZone }, { type: undefined, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }] });\n/** Directive for trapping focus within a region. */\nclass CdkTrapFocus {\n /** Whether the focus trap is active. */\n get enabled() {\n return this.focusTrap?.enabled || false;\n }\n set enabled(value) {\n if (this.focusTrap) {\n this.focusTrap.enabled = value;\n }\n }\n constructor(_elementRef, _focusTrapFactory, \n /**\n * @deprecated No longer being used. To be removed.\n * @breaking-change 13.0.0\n */\n _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 const platform = inject(Platform);\n if (platform.isBrowser) {\n this.focusTrap = this._focusTrapFactory.create(this._elementRef.nativeElement, true);\n }\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 && !this.focusTrap.hasAttached()) {\n this.focusTrap.attachAnchors();\n }\n }\n ngOnChanges(changes) {\n const autoCaptureChange = changes['autoCapture'];\n if (autoCaptureChange &&\n !autoCaptureChange.firstChange &&\n this.autoCapture &&\n this.focusTrap?.hasAttached()) {\n this._captureFocus();\n }\n }\n _captureFocus() {\n this._previouslyFocusedElement = _getFocusedElementPierceShadowDom();\n this.focusTrap?.focusInitialElementWhenReady();\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: CdkTrapFocus, deps: [{ token: i0.ElementRef }, { token: FocusTrapFactory }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Directive }); }\n static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: \"16.1.0\", version: \"18.2.0-next.2\", type: CdkTrapFocus, isStandalone: true, selector: \"[cdkTrapFocus]\", inputs: { enabled: [\"cdkTrapFocus\", \"enabled\", booleanAttribute], autoCapture: [\"cdkTrapFocusAutoCapture\", \"autoCapture\", booleanAttribute] }, exportAs: [\"cdkTrapFocus\"], usesOnChanges: true, ngImport: i0 }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: CdkTrapFocus, decorators: [{\n type: Directive,\n args: [{\n selector: '[cdkTrapFocus]',\n exportAs: 'cdkTrapFocus',\n standalone: true,\n }]\n }], ctorParameters: () => [{ type: i0.ElementRef }, { type: FocusTrapFactory }, { type: undefined, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }], propDecorators: { enabled: [{\n type: Input,\n args: [{ alias: 'cdkTrapFocus', transform: booleanAttribute }]\n }], autoCapture: [{\n type: Input,\n args: [{ alias: 'cdkTrapFocusAutoCapture', transform: booleanAttribute }]\n }] } });\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 /** 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 }\n else {\n this._focusTrapManager.deregister(this);\n }\n }\n constructor(_element, _checker, _ngZone, _document, _focusTrapManager, _inertStrategy, config, injector) {\n super(_element, _checker, _ngZone, _document, config.defer, injector);\n this._focusTrapManager = _focusTrapManager;\n this._inertStrategy = _inertStrategy;\n this._focusTrapManager.register(this);\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 * 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 (target && !focusTrapRoot.contains(target) && !target.closest?.('div.cdk-overlay-pane')) {\n // Some legacy FocusTrap usages have logic that focuses some element on the page\n // just before FocusTrap is destroyed. For backwards compatibility, wait\n // to be sure FocusTrap is still enabled before refocusing.\n setTimeout(() => {\n // Check whether focus wasn't put back into the focus trap while the timeout was pending.\n if (focusTrap.enabled && !focusTrapRoot.contains(focusTrap._document.activeElement)) {\n focusTrap.focusFirstTabbableElement();\n }\n });\n }\n }\n}\n\n/** The injection token used to specify the inert strategy. */\nconst FOCUS_TRAP_INERT_STRATEGY = new InjectionToken('FOCUS_TRAP_INERT_STRATEGY');\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 static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: FocusTrapManager, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }\n static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: FocusTrapManager, providedIn: 'root' }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: FocusTrapManager, decorators: [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }] });\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._injector = inject(Injector);\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 = { defer: false }) {\n let configObject;\n if (typeof config === 'boolean') {\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, this._injector);\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: ConfigurableFocusTrapFactory, deps: [{ token: InteractivityChecker }, { token: i0.NgZone }, { token: FocusTrapManager }, { token: DOCUMENT }, { token: FOCUS_TRAP_INERT_STRATEGY, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }\n static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: ConfigurableFocusTrapFactory, providedIn: 'root' }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: ConfigurableFocusTrapFactory, decorators: [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], ctorParameters: () => [{ type: InteractivityChecker }, { type: i0.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 }] }] });\n\n/** Gets whether an event could be a faked `mousedown` event dispatched by a screen reader. */\nfunction isFakeMousedownFromScreenReader(event) {\n // Some screen readers will dispatch a fake `mousedown` event when pressing enter or space on\n // a clickable element. We can distinguish these events when `event.buttons` is zero, or\n // `event.detail` is zero depending on the browser:\n // - `event.buttons` works on Firefox, but fails on Chrome.\n // - `detail` works on Chrome, but fails on Firefox.\n return event.buttons === 0 || event.detail === 0;\n}\n/** 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 &&\n touch.identifier === -1 &&\n (touch.radiusX == null || touch.radiusX === 1) &&\n (touch.radiusY == null || touch.radiusY === 1));\n}\n\n/**\n * Injectable options for the InputModalityDetector. These are shallowly merged with the default\n * options.\n */\nconst INPUT_MODALITY_DETECTOR_OPTIONS = new InjectionToken('cdk-input-modality-detector-options');\n/**\n * Default options for the InputModalityDetector.\n *\n * Modifier keys are ignored by default (i.e. when pressed won't cause the service to detect\n * keyboard input modality) for two reasons:\n *\n * 1. Modifier keys are commonly used with mouse to perform actions such as 'right click' or 'open\n * in new tab', and are thus less representative of actual keyboard interaction.\n * 2. VoiceOver triggers some keyboard events when linearly navigating with Control + Option (but\n * confusingly not with Caps Lock). Thus, to have parity with other screen readers, we ignore\n * these keys so as to not update the input modality.\n *\n * Note that we do not by default ignore the right Meta key on Safari because it has the same key\n * code as the ContextMenu key on other browsers. When we switch to using event.key, we can\n * distinguish between the two.\n */\nconst INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS = {\n ignoreKeys: [ALT, CONTROL, MAC_META, META, SHIFT],\n};\n/**\n * The amount of time needed to pass after a touchstart event in order for a subsequent mousedown\n * event to be attributed as mouse and not touch.\n *\n * This is the value used by AngularJS Material. Through trial and error (on iPhone 6S) they found\n * that a value of around 650ms seems appropriate.\n */\nconst TOUCH_BUFFER_MS = 650;\n/**\n * Event listener options that enable capturing and also mark the listener as passive if the browser\n * supports it.\n */\nconst modalityEventListenerOptions = normalizePassiveListenerOptions({\n passive: true,\n capture: true,\n});\n/**\n * Service that detects the user's input modality.\n *\n * This service does not update the input modality when a user navigates with a screen reader\n * (e.g. linear navigation with VoiceOver, object navigation / browse mode with NVDA, virtual PC\n * cursor mode with JAWS). This is in part due to technical limitations (i.e. keyboard events do not\n * fire as expected in these modes) but is also arguably the correct behavior. Navigating with a\n * screen reader is akin to visually scanning a page, and should not be interpreted as actual user\n * input interaction.\n *\n * When a user is not navigating but *interacting* with a screen reader, this service attempts to\n * update the input modality to keyboard, but in general this service's behavior is largely\n * undefined.\n */\nclass InputModalityDetector {\n /** The most recently detected input modality. */\n get mostRecentModality() {\n return this._modality.value;\n }\n constructor(_platform, ngZone, document, options) {\n this._platform = _platform;\n /**\n * The most recently detected input modality event target. Is null if no input modality has been\n * detected or if the associated event target is null for some unknown reason.\n */\n this._mostRecentTarget = null;\n /** The underlying BehaviorSubject that emits whenever an input modality is detected. */\n this._modality = new BehaviorSubject(null);\n /**\n * The timestamp of the last touch input modality. Used to determine whether mousedown events\n * should be attributed to mouse or touch.\n */\n this._lastTouchMs = 0;\n /**\n * Handles keydown events. Must be an arrow function in order to preserve the context when it gets\n * bound.\n */\n this._onKeydown = (event) => {\n // If this is one of the keys we should ignore, then ignore it and don't update the input\n // modality to keyboard.\n if (this._options?.ignoreKeys?.some(keyCode => keyCode === event.keyCode)) {\n return;\n }\n this._modality.next('keyboard');\n this._mostRecentTarget = _getEventTarget(event);\n };\n /**\n * Handles mousedown events. Must be an arrow function in order to preserve the context when it\n * gets bound.\n */\n this._onMousedown = (event) => {\n // Touches trigger both touch and mouse events, so we need to distinguish between mouse events\n // that were triggered via mouse vs touch. To do so, check if the mouse event occurs closely\n // after the previous touch event.\n if (Date.now() - this._lastTouchMs < TOUCH_BUFFER_MS) {\n return;\n }\n // Fake mousedown events are fired by some screen readers when controls are activated by the\n // screen reader. Attribute them to keyboard input modality.\n this._modality.next(isFakeMousedownFromScreenReader(event) ? 'keyboard' : 'mouse');\n this._mostRecentTarget = _getEventTarget(event);\n };\n /**\n * Handles touchstart events. Must be an arrow function in order to preserve the context when it\n * gets bound.\n */\n this._onTouchstart = (event) => {\n // Same scenario as mentioned in _onMousedown, but on touch screen devices, fake touchstart\n // events are fired. Again, attribute to keyboard input modality.\n if (isFakeTouchstartFromScreenReader(event)) {\n this._modality.next('keyboard');\n return;\n }\n // Store the timestamp of this touch event, as it's used to distinguish between mouse events\n // triggered via mouse vs touch.\n this._lastTouchMs = Date.now();\n this._modality.next('touch');\n this._mostRecentTarget = _getEventTarget(event);\n };\n this._options = {\n ...INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS,\n ...options,\n };\n // Skip the first emission as it's null.\n this.modalityDetected = this._modality.pipe(skip(1));\n this.modalityChanged = this.modalityDetected.pipe(distinctUntilChanged());\n // If we're not in a browser, this service should do nothing, as there's no relevant input\n // modality to detect.\n if (_platform.isBrowser) {\n ngZone.runOutsideAngular(() => {\n document.addEventListener('keydown', this._onKeydown, modalityEventListenerOptions);\n document.addEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);\n document.addEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);\n });\n }\n }\n ngOnDestroy() {\n this._modality.complete();\n if (this._platform.isBrowser) {\n document.removeEventListener('keydown', this._onKeydown, modalityEventListenerOptions);\n document.removeEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);\n document.removeEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);\n }\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: InputModalityDetector, deps: [{ token: i1.Platform }, { token: i0.NgZone }, { token: DOCUMENT }, { token: INPUT_MODALITY_DETECTOR_OPTIONS, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }\n static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: InputModalityDetector, providedIn: 'root' }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: InputModalityDetector, decorators: [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], ctorParameters: () => [{ type: i1.Platform }, { type: i0.NgZone }, { type: Document, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }, { type: undefined, decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [INPUT_MODALITY_DETECTOR_OPTIONS]\n }] }] });\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\nlet uniqueIds = 0;\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 if (this._liveElement.id) {\n this._exposeAnnouncerToModals(this._liveElement.id);\n }\n // This 100ms timeout is necessary for some browser + screen-reader combinations:\n // - Both JAWS and NVDA over IE11 will not announce anything without a non-zero timeout.\n // - With Chrome and IE11 with NVDA or JAWS, a repeated (identical) message won't be read a\n // second time without clearing and then using a non-zero delay.\n // (using JAWS 17 at time of this writing).\n return this._ngZone.runOutsideAngular(() => {\n if (!this._currentPromise) {\n this._currentPromise = new Promise(resolve => (this._currentResolve = resolve));\n }\n clearTimeout(this._previousTimeout);\n this._previousTimeout = setTimeout(() => {\n this._liveElement.textContent = message;\n if (typeof duration === 'number') {\n this._previousTimeout = setTimeout(() => this.clear(), duration);\n }\n // For some reason in tests this can be undefined\n // Probably related to ZoneJS and every other thing that patches browser APIs in tests\n this._currentResolve?.();\n this._currentPromise = this._currentResolve = undefined;\n }, 100);\n return this._currentPromise;\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 this._liveElement?.remove();\n this._liveElement = null;\n this._currentResolve?.();\n this._currentPromise = this._currentResolve = undefined;\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].remove();\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 liveEl.id = `cdk-live-announcer-${uniqueIds++}`;\n this._document.body.appendChild(liveEl);\n return liveEl;\n }\n /**\n * Some browsers won't expose the accessibility node of the live announcer element if there is an\n * `aria-modal` and the live announcer is outside of it. This method works around the issue by\n * pointing the `aria-owns` of all modals to the live announcer element.\n */\n _exposeAnnouncerToModals(id) {\n // TODO(http://github.com/angular/components/issues/26853): consider de-duplicating this with\n // the `SnakBarContainer` and other usages.\n //\n // Note that the selector here is limited to CDK overlays at the moment in order to reduce the\n // section of the DOM we need to look through. This should cover all the cases we support, but\n // the selector can be expanded if it turns out to be too narrow.\n const modals = this._document.querySelectorAll('body > .cdk-overlay-container [aria-modal=\"true\"]');\n for (let i = 0; i < modals.length; i++) {\n const modal = modals[i];\n const ariaOwns = modal.getAttribute('aria-owns');\n if (!ariaOwns) {\n modal.setAttribute('aria-owns', id);\n }\n else if (ariaOwns.indexOf(id) === -1) {\n modal.setAttribute('aria-owns', ariaOwns + ' ' + id);\n }\n }\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: LiveAnnouncer, deps: [{ token: LIVE_ANNOUNCER_ELEMENT_TOKEN, optional: true }, { token: i0.NgZone }, { token: DOCUMENT }, { token: LIVE_ANNOUNCER_DEFAULT_OPTIONS, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }\n static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: LiveAnnouncer, providedIn: 'root' }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: LiveAnnouncer, decorators: [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], ctorParameters: () => [{ type: undefined, decorators: [{\n type: Optional\n }, {\n type: Inject,\n args: [LIVE_ANNOUNCER_ELEMENT_TOKEN]\n }] }, { type: i0.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 }] }] });\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 /** 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 }\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, this.duration);\n this._previousAnnouncedText = elementText;\n }\n });\n });\n }\n }\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 ngOnDestroy() {\n if (this._subscription) {\n this._subscription.unsubscribe();\n }\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: CdkAriaLive, deps: [{ token: i0.ElementRef }, { token: LiveAnnouncer }, { token: i1$1.ContentObserver }, { token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Directive }); }\n static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: \"14.0.0\", version: \"18.2.0-next.2\", type: CdkAriaLive, isStandalone: true, selector: \"[cdkAriaLive]\", inputs: { politeness: [\"cdkAriaLive\", \"politeness\"], duration: [\"cdkAriaLiveDuration\", \"duration\"] }, exportAs: [\"cdkAriaLive\"], ngImport: i0 }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: CdkAriaLive, decorators: [{\n type: Directive,\n args: [{\n selector: '[cdkAriaLive]',\n exportAs: 'cdkAriaLive',\n standalone: true,\n }]\n }], ctorParameters: () => [{ type: i0.ElementRef }, { type: LiveAnnouncer }, { type: i1$1.ContentObserver }, { type: i0.NgZone }], propDecorators: { politeness: [{\n type: Input,\n args: ['cdkAriaLive']\n }], duration: [{\n type: Input,\n args: ['cdkAriaLiveDuration']\n }] } });\n\n/** Detection mode used for attributing the origin of a focus event. */\nvar FocusMonitorDetectionMode;\n(function (FocusMonitorDetectionMode) {\n /**\n * Any mousedown, keydown, or touchstart event that happened in the previous\n * tick or the current tick will be used to assign a focus event's origin (to\n * either mouse, keyboard, or touch). This is the default option.\n */\n FocusMonitorDetectionMode[FocusMonitorDetectionMode[\"IMMEDIATE\"] = 0] = \"IMMEDIATE\";\n /**\n * A focus event's origin is always attributed to the last corresponding\n * mousedown, keydown, or touchstart event, no matter how long ago it occurred.\n */\n FocusMonitorDetectionMode[FocusMonitorDetectionMode[\"EVENTUAL\"] = 1] = \"EVENTUAL\";\n})(FocusMonitorDetectionMode || (FocusMonitorDetectionMode = {}));\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, _inputModalityDetector, \n /** @breaking-change 11.0.0 make document required */\n document, options) {\n this._ngZone = _ngZone;\n this._platform = _platform;\n this._inputModalityDetector = _inputModalityDetector;\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 /**\n * Whether the origin was determined via a touch interaction. Necessary as properly attributing\n * focus events to touch interactions requires special logic.\n */\n this._originFromTouchInteraction = 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 `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 = window.setTimeout(() => (this._windowFocused = false));\n };\n /** Subject for stopping our InputModalityDetector subscription. */\n this._stopInputModalityDetector = new Subject();\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 = _getEventTarget(event);\n // We need to walk up the ancestor chain in order to support `checkChildren`.\n for (let element = target; element; element = element.parentElement) {\n if (event.type === 'focus') {\n this._onFocus(event, element);\n }\n else {\n this._onBlur(event, element);\n }\n }\n };\n this._document = document;\n this._detectionMode = options?.detectionMode || FocusMonitorDetectionMode.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 // Note: we don't want the observable to emit at all so we don't pass any parameters.\n return of();\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 }\n else {\n this._setOrigin(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 _getFocusOrigin(focusEventTarget) {\n if (this._origin) {\n // If the origin was realized via a touch interaction, we need to perform additional checks\n // to determine whether the focus origin should be attributed to touch or program.\n if (this._originFromTouchInteraction) {\n return this._shouldBeAttributedToTouch(focusEventTarget) ? 'touch' : 'program';\n }\n else {\n return this._origin;\n }\n }\n // If the window has just regained focus, we can restore the most recent origin from before the\n // window blurred. Otherwise, we've reached the point where we can't identify the source of the\n // focus. This typically means one of two things happened:\n //\n // 1) The element was programmatically focused, or\n // 2) The element was focused via screen reader navigation (which generally doesn't fire\n // events).\n //\n // Because we can't distinguish between these two cases, we default to setting `program`.\n if (this._windowFocused && this._lastFocusOrigin) {\n return this._lastFocusOrigin;\n }\n // If the interaction is coming from an input label, we consider it a mouse interactions.\n // This is a special case where focus moves on `click`, rather than `mousedown` which breaks\n // our detection, because all our assumptions are for `mousedown`. We need to handle this\n // special case, because it's very common for checkboxes and radio buttons.\n if (focusEventTarget && this._isLastInteractionFromInputLabel(focusEventTarget)) {\n return 'mouse';\n }\n return 'program';\n }\n /**\n * Returns whether the focus event should be attributed to touch. Recall that in IMMEDIATE mode, a\n * touch origin isn't immediately reset at the next tick (see _setOrigin). This means that when we\n * handle a focus event following a touch interaction, we need to determine whether (1) the focus\n * event was directly caused by the touch interaction or (2) the focus event was caused by a\n * subsequent programmatic focus call triggered by the touch interaction.\n * @param focusEventTarget The target of the focus event under examination.\n */\n _shouldBeAttributedToTouch(focusEventTarget) {\n // Please note that this check is not perfect. Consider the following edge case:\n //\n // <div #parent tabindex=\"0\">\n // <div #child tabindex=\"0\" (click)=\"#parent.focus()\"></div>\n // </div>\n //\n // Suppose there is a FocusMonitor in IMMEDIATE mode attached to #parent. When the user touches\n // #child, #parent is programmatically focused. This code will attribute the focus to touch\n // instead of program. This is a relatively minor edge-case that can be worked around by using\n // focusVia(parent, 'program') to focus #parent.\n return (this._detectionMode === FocusMonitorDetectionMode.EVENTUAL ||\n !!focusEventTarget?.contains(this._inputModalityDetector._mostRecentTarget));\n }\n /**\n * 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 element.classList.toggle('cdk-focused', !!origin);\n element.classList.toggle('cdk-touch-focused', origin === 'touch');\n element.classList.toggle('cdk-keyboard-focused', origin === 'keyboard');\n element.classList.toggle('cdk-mouse-focused', origin === 'mouse');\n element.classList.toggle('cdk-program-focused', origin === 'program');\n }\n /**\n * Updates the focus origin. If we're using immediate detection mode, we schedule an async\n * function to clear the origin at the end of a timeout. The duration of the timeout depends on\n * the origin being set.\n * @param origin The origin to set.\n * @param isFromInteraction Whether we are setting the origin from an interaction event.\n */\n _setOrigin(origin, isFromInteraction = false) {\n this._ngZone.runOutsideAngular(() => {\n this._origin = origin;\n this._originFromTouchInteraction = origin === 'touch' && isFromInteraction;\n // If we're in IMMEDIATE mode, reset the origin at the next tick (or in `TOUCH_BUFFER_MS` ms\n // for a touch event). We reset the origin at the next tick because Firefox focuses one tick\n // after the interaction event. We wait `TOUCH_BUFFER_MS` ms before resetting the origin for\n // a touch event because when a touch event is fired, the associated focus event isn't yet in\n // the event queue. Before doing so, clear any pending timeouts.\n if (this._detectionMode === FocusMonitorDetectionMode.IMMEDIATE) {\n clearTimeout(this._originTimeoutId);\n const ms = this._originFromTouchInteraction ? TOUCH_BUFFER_MS : 1;\n this._originTimeoutId = setTimeout(() => (this._origin = null), ms);\n }\n });\n }\n /**\n * 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 const focusEventTarget = _getEventTarget(event);\n if (!elementInfo || (!elementInfo.checkChildren && element !== focusEventTarget)) {\n return;\n }\n this._originChanged(element, this._getFocusOrigin(focusEventTarget), 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 ||\n (elementInfo.checkChildren &&\n event.relatedTarget instanceof Node &&\n element.contains(event.relatedTarget))) {\n return;\n }\n this._setClasses(element);\n this._emitOrigin(elementInfo, null);\n }\n _emitOrigin(info, origin) {\n if (info.subject.observers.length) {\n this._ngZone.run(() => info.subject.next(origin));\n }\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 window = this._getWindow();\n window.addEventListener('focus', this._windowFocusListener);\n });\n // The InputModalityDetector is also just a collection of global listeners.\n this._inputModalityDetector.modalityDetected\n .pipe(takeUntil(this._stopInputModalityDetector))\n .subscribe(modality => {\n this._setOrigin(modality, true /* isFromInteraction */);\n });\n }\n }\n _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 window = this._getWindow();\n window.removeEventListener('focus', this._windowFocusListener);\n // Equivalently, stop our InputModalityDetector subscription.\n this._stopInputModalityDetector.next();\n // Clear timeouts for all potentially pending timeouts to prevent the leaks.\n clearTimeout(this._windowFocusTimeoutId);\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, 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 /**\n * Returns whether an interaction is likely to have come from the user clicking the `label` of\n * an `input` or `textarea` in order to focus it.\n * @param focusEventTarget Target currently receiving focus.\n */\n _isLastInteractionFromInputLabel(focusEventTarget) {\n const { _mostRecentTarget: mostRecentTarget, mostRecentModality } = this._inputModalityDetector;\n // If the last interaction used the mouse on an element contained by one of the labels\n // of an `input`/`textarea` that is currently focused, it is very likely that the\n // user redirected focus using the label.\n if (mostRecentModality !== 'mouse' ||\n !mostRecentTarget ||\n mostRecentTarget === focusEventTarget ||\n (focusEventTarget.nodeName !== 'INPUT' && focusEventTarget.nodeName !== 'TEXTAREA') ||\n focusEventTarget.disabled) {\n return false;\n }\n const labels = focusEventTarget.labels;\n if (labels) {\n for (let i = 0; i < labels.length; i++) {\n if (labels[i].contains(mostRecentTarget)) {\n return true;\n }\n }\n }\n return false;\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: FocusMonitor, deps: [{ token: i0.NgZone }, { token: i1.Platform }, { token: InputModalityDetector }, { token: DOCUMENT, optional: true }, { token: FOCUS_MONITOR_DEFAULT_OPTIONS, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }\n static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: FocusMonitor, providedIn: 'root' }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: FocusMonitor, decorators: [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], ctorParameters: () => [{ type: i0.NgZone }, { type: i1.Platform }, { type: InputModalityDetector }, { 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 }] }] });\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._focusOrigin = null;\n this.cdkFocusChange = new EventEmitter();\n }\n get focusOrigin() {\n return this._focusOrigin;\n }\n ngAfterViewInit() {\n const element = this._elementRef.nativeElement;\n this._monitorSubscription = this._focusMonitor\n .monitor(element, element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))\n .subscribe(origin => {\n this._focusOrigin = origin;\n this.cdkFocusChange.emit(origin);\n });\n }\n ngOnDestroy() {\n this._focusMonitor.stopMonitoring(this._elementRef);\n if (this._monitorSubscription) {\n this._monitorSubscription.unsubscribe();\n }\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: CdkMonitorFocus, deps: [{ token: i0.ElementRef }, { token: FocusMonitor }], target: i0.ɵɵFactoryTarget.Directive }); }\n static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: \"14.0.0\", version: \"18.2.0-next.2\", type: CdkMonitorFocus, isStandalone: true, selector: \"[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]\", outputs: { cdkFocusChange: \"cdkFocusChange\" }, exportAs: [\"cdkMonitorFocus\"], ngImport: i0 }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: CdkMonitorFocus, decorators: [{\n type: Directive,\n args: [{\n selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',\n exportAs: 'cdkMonitorFocus',\n standalone: true,\n }]\n }], ctorParameters: () => [{ type: i0.ElementRef }, { type: FocusMonitor }], propDecorators: { cdkFocusChange: [{\n type: Output\n }] } });\n\n/** Set of possible high-contrast mode backgrounds. */\nvar HighContrastMode;\n(function (HighContrastMode) {\n HighContrastMode[HighContrastMode[\"NONE\"] = 0] = \"NONE\";\n HighContrastMode[HighContrastMode[\"BLACK_ON_WHITE\"] = 1] = \"BLACK_ON_WHITE\";\n HighContrastMode[HighContrastMode[\"WHITE_ON_BLACK\"] = 2] = \"WHITE_ON_BLACK\";\n})(HighContrastMode || (HighContrastMode = {}));\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 this._breakpointSubscription = inject(BreakpointObserver)\n .observe('(forced-colors: active)')\n .subscribe(() => {\n if (this._hasCheckedHighContrastMode) {\n this._hasCheckedHighContrastMode = false;\n this._applyBodyHighContrastModeCssClasses();\n }\n });\n }\n /** Gets the current high-contrast-mode for the page. */\n getHighContrastMode() {\n if (!this._platform.isBrowser) {\n return HighContrastMode.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)\n : null;\n const computedColor = ((computedStyle && computedStyle.backgroundColor) || '').replace(/ /g, '');\n testElement.remove();\n switch (computedColor) {\n // Pre Windows 11 dark theme.\n case 'rgb(0,0,0)':\n // Windows 11 dark themes.\n case 'rgb(45,50,54)':\n case 'rgb(32,32,32)':\n return HighContrastMode.WHITE_ON_BLACK;\n // Pre Windows 11 light theme.\n case 'rgb(255,255,255)':\n // Windows 11 light theme.\n case 'rgb(255,250,239)':\n return HighContrastMode.BLACK_ON_WHITE;\n }\n return HighContrastMode.NONE;\n }\n ngOnDestroy() {\n this._breakpointSubscription.unsubscribe();\n }\n /** Applies CSS classes indicating high-contrast mode to document body (browser-only). */\n _applyBodyHighContrastModeCssClasses() {\n if (!this._hasCheckedHighContrastMode && this._platform.isBrowser && this._document.body) {\n const bodyClasses = this._document.body.classList;\n bodyClasses.remove(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, BLACK_ON_WHITE_CSS_CLASS, WHITE_ON_BLACK_CSS_CLASS);\n this._hasCheckedHighContrastMode = true;\n const mode = this.getHighContrastMode();\n if (mode === HighContrastMode.BLACK_ON_WHITE) {\n bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, BLACK_ON_WHITE_CSS_CLASS);\n }\n else if (mode === HighContrastMode.WHITE_ON_BLACK) {\n bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, WHITE_ON_BLACK_CSS_CLASS);\n }\n }\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: HighContrastModeDetector, deps: [{ token: i1.Platform }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable }); }\n static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: HighContrastModeDetector, providedIn: 'root' }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: HighContrastModeDetector, decorators: [{\n type: Injectable,\n args: [{ providedIn: 'root' }]\n }], ctorParameters: () => [{ type: i1.Platform }, { type: undefined, decorators: [{\n type: Inject,\n args: [DOCUMENT]\n }] }] });\n\nclass A11yModule {\n constructor(highContrastModeDetector) {\n highContrastModeDetector._applyBodyHighContrastModeCssClasses();\n }\n static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: A11yModule, deps: [{ token: HighContrastModeDetector }], target: i0.ɵɵFactoryTarget.NgModule }); }\n static { this.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: \"14.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: A11yModule, imports: [ObserversModule, CdkAriaLive, CdkTrapFocus, CdkMonitorFocus], exports: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus] }); }\n static { this.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: A11yModule, imports: [ObserversModule] }); }\n}\ni0.ɵɵngDeclareClassMetadata({ minVersion: \"12.0.0\", version: \"18.2.0-next.2\", ngImport: i0, type: A11yModule, decorators: [{\n type: NgModule,\n args: [{\n imports: [ObserversModule, CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],\n exports: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],\n }]\n }], ctorParameters: () => [{ type: HighContrastModeDetector }] });\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, FocusMonitorDetectionMode, FocusTrap, FocusTrapFactory, HighContrastMode, HighContrastModeDetector, INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS, INPUT_MODALITY_DETECTOR_OPTIONS, InputModalityDetector, InteractivityChecker, IsFocusableConfig, LIVE_ANNOUNCER_DEFAULT_OPTIONS, LIVE_ANNOUNCER_ELEMENT_TOKEN, LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY, ListKeyManager, LiveAnnouncer, MESSAGES_CONTAINER_ID, NOOP_TREE_KEY_MANAGER_FACTORY, NOOP_TREE_KEY_MANAGER_FACTORY_PROVIDER, NoopTreeKeyManager, TREE_KEY_MANAGER, TREE_KEY_MANAGER_FACTORY, TREE_KEY_MANAGER_FACTORY_PROVIDER, TreeKeyManager, addAriaReferencedId, getAriaReferenceIds, 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