/** * @fileoverview added by tsickle * Generated from: src/cdk/a11y/key-manager/list-key-manager.ts * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc */ /** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import { QueryList } from '@angular/core'; import { Subject, Subscription } from 'rxjs'; import { UP_ARROW, DOWN_ARROW, LEFT_ARROW, RIGHT_ARROW, TAB, A, Z, ZERO, NINE, hasModifierKey, } from '@angular/cdk/keycodes'; import { debounceTime, filter, map, tap } from 'rxjs/operators'; /** * This interface is for items that can be passed to a ListKeyManager. * @record */ export function ListKeyManagerOption() { } if (false) { /** * Whether the option is disabled. * @type {?|undefined} */ ListKeyManagerOption.prototype.disabled; /** * Gets the label for this option. * @return {?} */ ListKeyManagerOption.prototype.getLabel = function () { }; } /** * This class manages keyboard events for selectable lists. If you pass it a query list * of items, it will set the active item correctly when arrow events occur. * @template T */ export class ListKeyManager { /** * @param {?} _items */ constructor(_items) { this._items = _items; this._activeItemIndex = -1; this._activeItem = null; this._wrap = false; this._letterKeyStream = new Subject(); this._typeaheadSubscription = Subscription.EMPTY; this._vertical = true; this._allowedModifierKeys = []; /** * Predicate function that can be used to check whether an item should be skipped * by the key manager. By default, disabled items are skipped. */ this._skipPredicateFn = (/** * @param {?} item * @return {?} */ (item) => item.disabled); // Buffer for the letters that the user has pressed when the typeahead option is turned on. this._pressedLetters = []; /** * Stream that emits any time the TAB key is pressed, so components can react * when focus is shifted off of the list. */ this.tabOut = new Subject(); /** * Stream that emits whenever the active item of the list manager changes. */ this.change = new Subject(); // We allow for the items to be an array because, in some cases, the consumer may // not have access to a QueryList of the items they want to manage (e.g. when the // items aren't being collected via `ViewChildren` or `ContentChildren`). if (_items instanceof QueryList) { _items.changes.subscribe((/** * @param {?} newItems * @return {?} */ (newItems) => { if (this._activeItem) { /** @type {?} */ const itemArray = newItems.toArray(); /** @type {?} */ const newIndex = itemArray.indexOf(this._activeItem); if (newIndex > -1 && newIndex !== this._activeItemIndex) { this._activeItemIndex = newIndex; } } })); } } /** * Sets the predicate function that determines which items should be skipped by the * list key manager. * @template THIS * @this {THIS} * @param {?} predicate Function that determines whether the given item should be skipped. * @return {THIS} */ skipPredicate(predicate) { (/** @type {?} */ (this))._skipPredicateFn = predicate; return (/** @type {?} */ (this)); } /** * Configures wrapping mode, which determines whether the active item will wrap to * the other end of list when there are no more items in the given direction. * @template THIS * @this {THIS} * @param {?=} shouldWrap Whether the list should wrap when reaching the end. * @return {THIS} */ withWrap(shouldWrap = true) { (/** @type {?} */ (this))._wrap = shouldWrap; return (/** @type {?} */ (this)); } /** * Configures whether the key manager should be able to move the selection vertically. * @template THIS * @this {THIS} * @param {?=} enabled Whether vertical selection should be enabled. * @return {THIS} */ withVerticalOrientation(enabled = true) { (/** @type {?} */ (this))._vertical = enabled; return (/** @type {?} */ (this)); } /** * Configures the key manager to move the selection horizontally. * Passing in `null` will disable horizontal movement. * @template THIS * @this {THIS} * @param {?} direction Direction in which the selection can be moved. * @return {THIS} */ withHorizontalOrientation(direction) { (/** @type {?} */ (this))._horizontal = direction; return (/** @type {?} */ (this)); } /** * Modifier keys which are allowed to be held down and whose default actions will be prevented * as the user is pressing the arrow keys. Defaults to not allowing any modifier keys. * @template THIS * @this {THIS} * @param {?} keys * @return {THIS} */ withAllowedModifierKeys(keys) { (/** @type {?} */ (this))._allowedModifierKeys = keys; return (/** @type {?} */ (this)); } /** * Turns on typeahead mode which allows users to set the active item by typing. * @template THIS * @this {THIS} * @param {?=} debounceInterval Time to wait after the last keystroke before setting the active item. * @return {THIS} */ withTypeAhead(debounceInterval = 200) { if ((/** @type {?} */ (this))._items.length && (/** @type {?} */ (this))._items.some((/** * @param {?} item * @return {?} */ item => typeof item.getLabel !== 'function'))) { throw Error('ListKeyManager items in typeahead mode must implement the `getLabel` method.'); } (/** @type {?} */ (this))._typeaheadSubscription.unsubscribe(); // Debounce the presses of non-navigational keys, collect the ones that correspond to letters // and convert those letters back into a string. Afterwards find the first item that starts // with that string and select it. (/** @type {?} */ (this))._typeaheadSubscription = (/** @type {?} */ (this))._letterKeyStream.pipe(tap((/** * @param {?} letter * @return {?} */ letter => (/** @type {?} */ (this))._pressedLetters.push(letter))), debounceTime(debounceInterval), filter((/** * @return {?} */ () => (/** @type {?} */ (this))._pressedLetters.length > 0)), map((/** * @return {?} */ () => (/** @type {?} */ (this))._pressedLetters.join('')))).subscribe((/** * @param {?} inputString * @return {?} */ inputString => { /** @type {?} */ const items = (/** @type {?} */ (this))._getItemsArray(); // Start at 1 because we want to start searching at the item immediately // following the current active item. for (let i = 1; i < items.length + 1; i++) { /** @type {?} */ const index = ((/** @type {?} */ (this))._activeItemIndex + i) % items.length; /** @type {?} */ const item = items[index]; if (!(/** @type {?} */ (this))._skipPredicateFn(item) && (/** @type {?} */ (item.getLabel))().toUpperCase().trim().indexOf(inputString) === 0) { (/** @type {?} */ (this)).setActiveItem(index); break; } } (/** @type {?} */ (this))._pressedLetters = []; })); return (/** @type {?} */ (this)); } /** * @param {?} item * @return {?} */ setActiveItem(item) { /** @type {?} */ const previousIndex = this._activeItemIndex; this.updateActiveItem(item); if (this._activeItemIndex !== previousIndex) { this.change.next(this._activeItemIndex); } } /** * Sets the active item depending on the key event passed in. * @param {?} event Keyboard event to be used for determining which element should be active. * @return {?} */ onKeydown(event) { /** @type {?} */ const keyCode = event.keyCode; /** @type {?} */ const modifiers = ['altKey', 'ctrlKey', 'metaKey', 'shiftKey']; /** @type {?} */ const isModifierAllowed = modifiers.every((/** * @param {?} modifier * @return {?} */ modifier => { return !event[modifier] || this._allowedModifierKeys.indexOf(modifier) > -1; })); switch (keyCode) { case TAB: this.tabOut.next(); return; case DOWN_ARROW: if (this._vertical && isModifierAllowed) { this.setNextItemActive(); break; } else { return; } case UP_ARROW: if (this._vertical && isModifierAllowed) { this.setPreviousItemActive(); break; } else { return; } case RIGHT_ARROW: if (this._horizontal && isModifierAllowed) { this._horizontal === 'rtl' ? this.setPreviousItemActive() : this.setNextItemActive(); break; } else { return; } case LEFT_ARROW: if (this._horizontal && isModifierAllowed) { this._horizontal === 'rtl' ? this.setNextItemActive() : this.setPreviousItemActive(); break; } else { return; } default: if (isModifierAllowed || hasModifierKey(event, 'shiftKey')) { // Attempt to use the `event.key` which also maps it to the user's keyboard language, // otherwise fall back to resolving alphanumeric characters via the keyCode. if (event.key && event.key.length === 1) { this._letterKeyStream.next(event.key.toLocaleUpperCase()); } else if ((keyCode >= A && keyCode <= Z) || (keyCode >= ZERO && keyCode <= NINE)) { this._letterKeyStream.next(String.fromCharCode(keyCode)); } } // Note that we return here, in order to avoid preventing // the default action of non-navigational keys. return; } this._pressedLetters = []; event.preventDefault(); } /** * Index of the currently active item. * @return {?} */ get activeItemIndex() { return this._activeItemIndex; } /** * The active item. * @return {?} */ get activeItem() { return this._activeItem; } /** * Gets whether the user is currently typing into the manager using the typeahead feature. * @return {?} */ isTyping() { return this._pressedLetters.length > 0; } /** * Sets the active item to the first enabled item in the list. * @return {?} */ setFirstItemActive() { this._setActiveItemByIndex(0, 1); } /** * Sets the active item to the last enabled item in the list. * @return {?} */ setLastItemActive() { this._setActiveItemByIndex(this._items.length - 1, -1); } /** * Sets the active item to the next enabled item in the list. * @return {?} */ setNextItemActive() { this._activeItemIndex < 0 ? this.setFirstItemActive() : this._setActiveItemByDelta(1); } /** * Sets the active item to a previous enabled item in the list. * @return {?} */ setPreviousItemActive() { this._activeItemIndex < 0 && this._wrap ? this.setLastItemActive() : this._setActiveItemByDelta(-1); } /** * @param {?} item * @return {?} */ updateActiveItem(item) { /** @type {?} */ const itemArray = this._getItemsArray(); /** @type {?} */ const index = typeof item === 'number' ? item : itemArray.indexOf(item); /** @type {?} */ const activeItem = itemArray[index]; // Explicitly check for `null` and `undefined` because other falsy values are valid. this._activeItem = activeItem == null ? null : activeItem; this._activeItemIndex = index; } /** * This method sets the active item, given a list of items and the delta between the * currently active item and the new active item. It will calculate differently * depending on whether wrap mode is turned on. * @private * @param {?} delta * @return {?} */ _setActiveItemByDelta(delta) { this._wrap ? this._setActiveInWrapMode(delta) : this._setActiveInDefaultMode(delta); } /** * Sets the active item properly given "wrap" mode. In other words, it will continue to move * down the list until it finds an item that is not disabled, and it will wrap if it * encounters either end of the list. * @private * @param {?} delta * @return {?} */ _setActiveInWrapMode(delta) { /** @type {?} */ const items = this._getItemsArray(); for (let i = 1; i <= items.length; i++) { /** @type {?} */ const index = (this._activeItemIndex + (delta * i) + items.length) % items.length; /** @type {?} */ const item = items[index]; if (!this._skipPredicateFn(item)) { this.setActiveItem(index); return; } } } /** * Sets the active item properly given the default mode. In other words, it will * continue to move down the list until it finds an item that is not disabled. If * it encounters either end of the list, it will stop and not wrap. * @private * @param {?} delta * @return {?} */ _setActiveInDefaultMode(delta) { this._setActiveItemByIndex(this._activeItemIndex + delta, delta); } /** * Sets the active item to the first enabled item starting at the index specified. If the * item is disabled, it will move in the fallbackDelta direction until it either * finds an enabled item or encounters the end of the list. * @private * @param {?} index * @param {?} fallbackDelta * @return {?} */ _setActiveItemByIndex(index, fallbackDelta) { /** @type {?} */ const items = this._getItemsArray(); if (!items[index]) { return; } while (this._skipPredicateFn(items[index])) { index += fallbackDelta; if (!items[index]) { return; } } this.setActiveItem(index); } /** * Returns the items as an array. * @private * @return {?} */ _getItemsArray() { return this._items instanceof QueryList ? this._items.toArray() : this._items; } } if (false) { /** * @type {?} * @private */ ListKeyManager.prototype._activeItemIndex; /** * @type {?} * @private */ ListKeyManager.prototype._activeItem; /** * @type {?} * @private */ ListKeyManager.prototype._wrap; /** * @type {?} * @private */ ListKeyManager.prototype._letterKeyStream; /** * @type {?} * @private */ ListKeyManager.prototype._typeaheadSubscription; /** * @type {?} * @private */ ListKeyManager.prototype._vertical; /** * @type {?} * @private */ ListKeyManager.prototype._horizontal; /** * @type {?} * @private */ ListKeyManager.prototype._allowedModifierKeys; /** * Predicate function that can be used to check whether an item should be skipped * by the key manager. By default, disabled items are skipped. * @type {?} * @private */ ListKeyManager.prototype._skipPredicateFn; /** * @type {?} * @private */ ListKeyManager.prototype._pressedLetters; /** * Stream that emits any time the TAB key is pressed, so components can react * when focus is shifted off of the list. * @type {?} */ ListKeyManager.prototype.tabOut; /** * Stream that emits whenever the active item of the list manager changes. * @type {?} */ ListKeyManager.prototype.change; /** * @type {?} * @private */ ListKeyManager.prototype._items; } //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {QueryList} from '@angular/core';\nimport {Subject, Subscription} from 'rxjs';\nimport {\n  UP_ARROW,\n  DOWN_ARROW,\n  LEFT_ARROW,\n  RIGHT_ARROW,\n  TAB,\n  A,\n  Z,\n  ZERO,\n  NINE,\n  hasModifierKey,\n} from '@angular/cdk/keycodes';\nimport {debounceTime, filter, map, tap} from 'rxjs/operators';\n\n/** This interface is for items that can be passed to a ListKeyManager. */\nexport interface ListKeyManagerOption {\n  /** Whether the option is disabled. */\n  disabled?: boolean;\n\n  /** Gets the label for this option. */\n  getLabel?(): string;\n}\n\n/** Modifier keys handled by the ListKeyManager. */\nexport type ListKeyManagerModifierKey = 'altKey' | 'ctrlKey' | 'metaKey' | 'shiftKey';\n\n/**\n * This class manages keyboard events for selectable lists. If you pass it a query list\n * of items, it will set the active item correctly when arrow events occur.\n */\nexport class ListKeyManager<T extends ListKeyManagerOption> {\n  private _activeItemIndex = -1;\n  private _activeItem: T | null = null;\n  private _wrap = false;\n  private _letterKeyStream = new Subject<string>();\n  private _typeaheadSubscription = Subscription.EMPTY;\n  private _vertical = true;\n  private _horizontal: 'ltr' | 'rtl' | null;\n  private _allowedModifierKeys: ListKeyManagerModifierKey[] = [];\n\n  /**\n   * Predicate function that can be used to check whether an item should be skipped\n   * by the key manager. By default, disabled items are skipped.\n   */\n  private _skipPredicateFn = (item: T) => item.disabled;\n\n  // Buffer for the letters that the user has pressed when the typeahead option is turned on.\n  private _pressedLetters: string[] = [];\n\n  constructor(private _items: QueryList<T> | T[]) {\n    // We allow for the items to be an array because, in some cases, the consumer may\n    // not have access to a QueryList of the items they want to manage (e.g. when the\n    // items aren't being collected via `ViewChildren` or `ContentChildren`).\n    if (_items instanceof QueryList) {\n      _items.changes.subscribe((newItems: QueryList<T>) => {\n        if (this._activeItem) {\n          const itemArray = newItems.toArray();\n          const newIndex = itemArray.indexOf(this._activeItem);\n\n          if (newIndex > -1 && newIndex !== this._activeItemIndex) {\n            this._activeItemIndex = newIndex;\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Stream that emits any time the TAB key is pressed, so components can react\n   * when focus is shifted off of the list.\n   */\n  tabOut: Subject<void> = new Subject<void>();\n\n  /** Stream that emits whenever the active item of the list manager changes. */\n  change = new Subject<number>();\n\n  /**\n   * Sets the predicate function that determines which items should be skipped by the\n   * list key manager.\n   * @param predicate Function that determines whether the given item should be skipped.\n   */\n  skipPredicate(predicate: (item: T) => boolean): this {\n    this._skipPredicateFn = predicate;\n    return this;\n  }\n\n  /**\n   * Configures wrapping mode, which determines whether the active item will wrap to\n   * the other end of list when there are no more items in the given direction.\n   * @param shouldWrap Whether the list should wrap when reaching the end.\n   */\n  withWrap(shouldWrap = true): this {\n    this._wrap = shouldWrap;\n    return this;\n  }\n\n  /**\n   * Configures whether the key manager should be able to move the selection vertically.\n   * @param enabled Whether vertical selection should be enabled.\n   */\n  withVerticalOrientation(enabled: boolean = true): this {\n    this._vertical = enabled;\n    return this;\n  }\n\n  /**\n   * Configures the key manager to move the selection horizontally.\n   * Passing in `null` will disable horizontal movement.\n   * @param direction Direction in which the selection can be moved.\n   */\n  withHorizontalOrientation(direction: 'ltr' | 'rtl' | null): this {\n    this._horizontal = direction;\n    return this;\n  }\n\n  /**\n   * Modifier keys which are allowed to be held down and whose default actions will be prevented\n   * as the user is pressing the arrow keys. Defaults to not allowing any modifier keys.\n   */\n  withAllowedModifierKeys(keys: ListKeyManagerModifierKey[]): this {\n    this._allowedModifierKeys = keys;\n    return this;\n  }\n\n  /**\n   * Turns on typeahead mode which allows users to set the active item by typing.\n   * @param debounceInterval Time to wait after the last keystroke before setting the active item.\n   */\n  withTypeAhead(debounceInterval: number = 200): this {\n    if (this._items.length && this._items.some(item => typeof item.getLabel !== 'function')) {\n      throw Error('ListKeyManager items in typeahead mode must implement the `getLabel` method.');\n    }\n\n    this._typeaheadSubscription.unsubscribe();\n\n    // Debounce the presses of non-navigational keys, collect the ones that correspond to letters\n    // and convert those letters back into a string. Afterwards find the first item that starts\n    // with that string and select it.\n    this._typeaheadSubscription = this._letterKeyStream.pipe(\n      tap(letter => this._pressedLetters.push(letter)),\n      debounceTime(debounceInterval),\n      filter(() => this._pressedLetters.length > 0),\n      map(() => this._pressedLetters.join(''))\n    ).subscribe(inputString => {\n      const items = this._getItemsArray();\n\n      // Start at 1 because we want to start searching at the item immediately\n      // following the current active item.\n      for (let i = 1; i < items.length + 1; i++) {\n        const index = (this._activeItemIndex + i) % items.length;\n        const item = items[index];\n\n        if (!this._skipPredicateFn(item) &&\n            item.getLabel!().toUpperCase().trim().indexOf(inputString) === 0) {\n\n          this.setActiveItem(index);\n          break;\n        }\n      }\n\n      this._pressedLetters = [];\n    });\n\n    return this;\n  }\n\n  /**\n   * Sets the active item to the item at the index specified.\n   * @param index The index of the item to be set as active.\n   */\n  setActiveItem(index: number): void;\n\n  /**\n   * Sets the active item to the specified item.\n   * @param item The item to be set as active.\n   */\n  setActiveItem(item: T): void;\n\n  setActiveItem(item: any): void {\n    const previousIndex = this._activeItemIndex;\n\n    this.updateActiveItem(item);\n\n    if (this._activeItemIndex !== previousIndex) {\n      this.change.next(this._activeItemIndex);\n    }\n  }\n\n  /**\n   * Sets the active item depending on the key event passed in.\n   * @param event Keyboard event to be used for determining which element should be active.\n   */\n  onKeydown(event: KeyboardEvent): void {\n    const keyCode = event.keyCode;\n    const modifiers: ListKeyManagerModifierKey[] = ['altKey', 'ctrlKey', 'metaKey', 'shiftKey'];\n    const isModifierAllowed = modifiers.every(modifier => {\n      return !event[modifier] || this._allowedModifierKeys.indexOf(modifier) > -1;\n    });\n\n    switch (keyCode) {\n      case TAB:\n        this.tabOut.next();\n        return;\n\n      case DOWN_ARROW:\n        if (this._vertical && isModifierAllowed) {\n          this.setNextItemActive();\n          break;\n        } else {\n          return;\n        }\n\n      case UP_ARROW:\n        if (this._vertical && isModifierAllowed) {\n          this.setPreviousItemActive();\n          break;\n        } else {\n          return;\n        }\n\n      case RIGHT_ARROW:\n        if (this._horizontal && isModifierAllowed) {\n          this._horizontal === 'rtl' ? this.setPreviousItemActive() : this.setNextItemActive();\n          break;\n        } else {\n          return;\n        }\n\n      case LEFT_ARROW:\n        if (this._horizontal && isModifierAllowed) {\n          this._horizontal === 'rtl' ? this.setNextItemActive() : this.setPreviousItemActive();\n          break;\n        } else {\n          return;\n        }\n\n      default:\n      if (isModifierAllowed || hasModifierKey(event, 'shiftKey')) {\n          // Attempt to use the `event.key` which also maps it to the user's keyboard language,\n          // otherwise fall back to resolving alphanumeric characters via the keyCode.\n          if (event.key && event.key.length === 1) {\n            this._letterKeyStream.next(event.key.toLocaleUpperCase());\n          } else if ((keyCode >= A && keyCode <= Z) || (keyCode >= ZERO && keyCode <= NINE)) {\n            this._letterKeyStream.next(String.fromCharCode(keyCode));\n          }\n        }\n\n        // Note that we return here, in order to avoid preventing\n        // the default action of non-navigational keys.\n        return;\n    }\n\n    this._pressedLetters = [];\n    event.preventDefault();\n  }\n\n  /** Index of the currently active item. */\n  get activeItemIndex(): number | null {\n    return this._activeItemIndex;\n  }\n\n  /** The active item. */\n  get activeItem(): T | null {\n    return this._activeItem;\n  }\n\n  /** Gets whether the user is currently typing into the manager using the typeahead feature. */\n  isTyping(): boolean {\n    return this._pressedLetters.length > 0;\n  }\n\n  /** Sets the active item to the first enabled item in the list. */\n  setFirstItemActive(): void {\n    this._setActiveItemByIndex(0, 1);\n  }\n\n  /** Sets the active item to the last enabled item in the list. */\n  setLastItemActive(): void {\n    this._setActiveItemByIndex(this._items.length - 1, -1);\n  }\n\n  /** Sets the active item to the next enabled item in the list. */\n  setNextItemActive(): void {\n    this._activeItemIndex < 0 ? this.setFirstItemActive() : this._setActiveItemByDelta(1);\n  }\n\n  /** Sets the active item to a previous enabled item in the list. */\n  setPreviousItemActive(): void {\n    this._activeItemIndex < 0 && this._wrap ? this.setLastItemActive()\n                                            : this._setActiveItemByDelta(-1);\n  }\n\n  /**\n   * Allows setting the active without any other effects.\n   * @param index Index of the item to be set as active.\n   */\n  updateActiveItem(index: number): void;\n\n  /**\n   * Allows setting the active item without any other effects.\n   * @param item Item to be set as active.\n   */\n  updateActiveItem(item: T): void;\n\n  updateActiveItem(item: any): void {\n    const itemArray = this._getItemsArray();\n    const index = typeof item === 'number' ? item : itemArray.indexOf(item);\n    const activeItem = itemArray[index];\n\n    // Explicitly check for `null` and `undefined` because other falsy values are valid.\n    this._activeItem = activeItem == null ? null : activeItem;\n    this._activeItemIndex = index;\n  }\n\n  /**\n   * This method sets the active item, given a list of items and the delta between the\n   * currently active item and the new active item. It will calculate differently\n   * depending on whether wrap mode is turned on.\n   */\n  private _setActiveItemByDelta(delta: -1 | 1): void {\n    this._wrap ? this._setActiveInWrapMode(delta) : this._setActiveInDefaultMode(delta);\n  }\n\n  /**\n   * Sets the active item properly given \"wrap\" mode. In other words, it will continue to move\n   * down the list until it finds an item that is not disabled, and it will wrap if it\n   * encounters either end of the list.\n   */\n  private _setActiveInWrapMode(delta: -1 | 1): void {\n    const items = this._getItemsArray();\n\n    for (let i = 1; i <= items.length; i++) {\n      const index = (this._activeItemIndex + (delta * i) + items.length) % items.length;\n      const item = items[index];\n\n      if (!this._skipPredicateFn(item)) {\n        this.setActiveItem(index);\n        return;\n      }\n    }\n  }\n\n  /**\n   * Sets the active item properly given the default mode. In other words, it will\n   * continue to move down the list until it finds an item that is not disabled. If\n   * it encounters either end of the list, it will stop and not wrap.\n   */\n  private _setActiveInDefaultMode(delta: -1 | 1): void {\n    this._setActiveItemByIndex(this._activeItemIndex + delta, delta);\n  }\n\n  /**\n   * Sets the active item to the first enabled item starting at the index specified. If the\n   * item is disabled, it will move in the fallbackDelta direction until it either\n   * finds an enabled item or encounters the end of the list.\n   */\n  private _setActiveItemByIndex(index: number, fallbackDelta: -1 | 1): void {\n    const items = this._getItemsArray();\n\n    if (!items[index]) {\n      return;\n    }\n\n    while (this._skipPredicateFn(items[index])) {\n      index += fallbackDelta;\n\n      if (!items[index]) {\n        return;\n      }\n    }\n\n    this.setActiveItem(index);\n  }\n\n  /** Returns the items as an array. */\n  private _getItemsArray(): T[] {\n    return this._items instanceof QueryList ? this._items.toArray() : this._items;\n  }\n}\n"]}