/** * @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 { coerceBooleanProperty } from '@angular/cdk/coercion'; import { _getFocusedElementPierceShadowDom } from '@angular/cdk/platform'; import { DOCUMENT } from '@angular/common'; import { Directive, ElementRef, Inject, Injectable, Input, NgZone, } from '@angular/core'; import { take } from 'rxjs/operators'; import { InteractivityChecker } from '../interactivity-checker/interactivity-checker'; import * as i0 from "@angular/core"; import * as i1 from "../interactivity-checker/interactivity-checker"; /** * Class that allows for trapping focus within a DOM element. * * This class currently uses a relatively simple approach to focus trapping. * It assumes that the tab order is the same as DOM order, which is not necessarily true. * Things like `tabIndex > 0`, flex `order`, and shadow roots can cause the two to be misaligned. * * @deprecated Use `ConfigurableFocusTrap` instead. * @breaking-change 11.0.0 */ export class FocusTrap { /** Whether the focus trap is active. */ get enabled() { return this._enabled; } set enabled(value) { this._enabled = value; if (this._startAnchor && this._endAnchor) { this._toggleAnchorTabIndex(value, this._startAnchor); this._toggleAnchorTabIndex(value, this._endAnchor); } } constructor(_element, _checker, _ngZone, _document, deferAnchors = false) { this._element = _element; this._checker = _checker; this._ngZone = _ngZone; this._document = _document; this._hasAttached = false; // Event listeners for the anchors. Need to be regular functions so that we can unbind them later. this.startAnchorListener = () => this.focusLastTabbableElement(); this.endAnchorListener = () => this.focusFirstTabbableElement(); this._enabled = true; if (!deferAnchors) { this.attachAnchors(); } } /** Destroys the focus trap by cleaning up the anchors. */ destroy() { const startAnchor = this._startAnchor; const endAnchor = this._endAnchor; if (startAnchor) { startAnchor.removeEventListener('focus', this.startAnchorListener); startAnchor.remove(); } if (endAnchor) { endAnchor.removeEventListener('focus', this.endAnchorListener); endAnchor.remove(); } this._startAnchor = this._endAnchor = null; this._hasAttached = false; } /** * Inserts the anchors into the DOM. This is usually done automatically * in the constructor, but can be deferred for cases like directives with `*ngIf`. * @returns Whether the focus trap managed to attach successfully. This may not be the case * if the target element isn't currently in the DOM. */ attachAnchors() { // If we're not on the browser, there can be no focus to trap. if (this._hasAttached) { return true; } this._ngZone.runOutsideAngular(() => { if (!this._startAnchor) { this._startAnchor = this._createAnchor(); this._startAnchor.addEventListener('focus', this.startAnchorListener); } if (!this._endAnchor) { this._endAnchor = this._createAnchor(); this._endAnchor.addEventListener('focus', this.endAnchorListener); } }); if (this._element.parentNode) { this._element.parentNode.insertBefore(this._startAnchor, this._element); this._element.parentNode.insertBefore(this._endAnchor, this._element.nextSibling); this._hasAttached = true; } return this._hasAttached; } /** * Waits for the zone to stabilize, then focuses the first tabbable element. * @returns Returns a promise that resolves with a boolean, depending * on whether focus was moved successfully. */ focusInitialElementWhenReady(options) { return new Promise(resolve => { this._executeOnStable(() => resolve(this.focusInitialElement(options))); }); } /** * Waits for the zone to stabilize, then focuses * the first tabbable element within the focus trap region. * @returns Returns a promise that resolves with a boolean, depending * on whether focus was moved successfully. */ focusFirstTabbableElementWhenReady(options) { return new Promise(resolve => { this._executeOnStable(() => resolve(this.focusFirstTabbableElement(options))); }); } /** * Waits for the zone to stabilize, then focuses * the last tabbable element within the focus trap region. * @returns Returns a promise that resolves with a boolean, depending * on whether focus was moved successfully. */ focusLastTabbableElementWhenReady(options) { return new Promise(resolve => { this._executeOnStable(() => resolve(this.focusLastTabbableElement(options))); }); } /** * Get the specified boundary element of the trapped region. * @param bound The boundary to get (start or end of trapped region). * @returns The boundary element. */ _getRegionBoundary(bound) { // Contains the deprecated version of selector, for temporary backwards comparability. const markers = this._element.querySelectorAll(`[cdk-focus-region-${bound}], ` + `[cdkFocusRegion${bound}], ` + `[cdk-focus-${bound}]`); if (typeof ngDevMode === 'undefined' || ngDevMode) { for (let i = 0; i < markers.length; i++) { // @breaking-change 8.0.0 if (markers[i].hasAttribute(`cdk-focus-${bound}`)) { 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]); } else if (markers[i].hasAttribute(`cdk-focus-region-${bound}`)) { console.warn(`Found use of deprecated attribute 'cdk-focus-region-${bound}', ` + `use 'cdkFocusRegion${bound}' instead. The deprecated attribute ` + `will be removed in 8.0.0.`, markers[i]); } } } if (bound == 'start') { return markers.length ? markers[0] : this._getFirstTabbableElement(this._element); } return markers.length ? markers[markers.length - 1] : this._getLastTabbableElement(this._element); } /** * Focuses the element that should be focused when the focus trap is initialized. * @returns Whether focus was moved successfully. */ focusInitialElement(options) { // Contains the deprecated version of selector, for temporary backwards comparability. const redirectToElement = this._element.querySelector(`[cdk-focus-initial], ` + `[cdkFocusInitial]`); if (redirectToElement) { // @breaking-change 8.0.0 if ((typeof ngDevMode === 'undefined' || ngDevMode) && redirectToElement.hasAttribute(`cdk-focus-initial`)) { console.warn(`Found use of deprecated attribute 'cdk-focus-initial', ` + `use 'cdkFocusInitial' instead. The deprecated attribute ` + `will be removed in 8.0.0`, redirectToElement); } // Warn the consumer if the element they've pointed to // isn't focusable, when not in production mode. if ((typeof ngDevMode === 'undefined' || ngDevMode) && !this._checker.isFocusable(redirectToElement)) { console.warn(`Element matching '[cdkFocusInitial]' is not focusable.`, redirectToElement); } if (!this._checker.isFocusable(redirectToElement)) { const focusableChild = this._getFirstTabbableElement(redirectToElement); focusableChild?.focus(options); return !!focusableChild; } redirectToElement.focus(options); return true; } return this.focusFirstTabbableElement(options); } /** * Focuses the first tabbable element within the focus trap region. * @returns Whether focus was moved successfully. */ focusFirstTabbableElement(options) { const redirectToElement = this._getRegionBoundary('start'); if (redirectToElement) { redirectToElement.focus(options); } return !!redirectToElement; } /** * Focuses the last tabbable element within the focus trap region. * @returns Whether focus was moved successfully. */ focusLastTabbableElement(options) { const redirectToElement = this._getRegionBoundary('end'); if (redirectToElement) { redirectToElement.focus(options); } return !!redirectToElement; } /** * Checks whether the focus trap has successfully been attached. */ hasAttached() { return this._hasAttached; } /** Get the first tabbable element from a DOM subtree (inclusive). */ _getFirstTabbableElement(root) { if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) { return root; } const children = root.children; for (let i = 0; i < children.length; i++) { const tabbableChild = children[i].nodeType === this._document.ELEMENT_NODE ? this._getFirstTabbableElement(children[i]) : null; if (tabbableChild) { return tabbableChild; } } return null; } /** Get the last tabbable element from a DOM subtree (inclusive). */ _getLastTabbableElement(root) { if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) { return root; } // Iterate in reverse DOM order. const children = root.children; for (let i = children.length - 1; i >= 0; i--) { const tabbableChild = children[i].nodeType === this._document.ELEMENT_NODE ? this._getLastTabbableElement(children[i]) : null; if (tabbableChild) { return tabbableChild; } } return null; } /** Creates an anchor element. */ _createAnchor() { const anchor = this._document.createElement('div'); this._toggleAnchorTabIndex(this._enabled, anchor); anchor.classList.add('cdk-visually-hidden'); anchor.classList.add('cdk-focus-trap-anchor'); anchor.setAttribute('aria-hidden', 'true'); return anchor; } /** * Toggles the `tabindex` of an anchor, based on the enabled state of the focus trap. * @param isEnabled Whether the focus trap is enabled. * @param anchor Anchor on which to toggle the tabindex. */ _toggleAnchorTabIndex(isEnabled, anchor) { // Remove the tabindex completely, rather than setting it to -1, because if the // element has a tabindex, the user might still hit it when navigating with the arrow keys. isEnabled ? anchor.setAttribute('tabindex', '0') : anchor.removeAttribute('tabindex'); } /** * Toggles the`tabindex` of both anchors to either trap Tab focus or allow it to escape. * @param enabled: Whether the anchors should trap Tab. */ toggleAnchors(enabled) { if (this._startAnchor && this._endAnchor) { this._toggleAnchorTabIndex(enabled, this._startAnchor); this._toggleAnchorTabIndex(enabled, this._endAnchor); } } /** Executes a function when the zone is stable. */ _executeOnStable(fn) { if (this._ngZone.isStable) { fn(); } else { this._ngZone.onStable.pipe(take(1)).subscribe(fn); } } } /** * Factory that allows easy instantiation of focus traps. * @deprecated Use `ConfigurableFocusTrapFactory` instead. * @breaking-change 11.0.0 */ export class FocusTrapFactory { constructor(_checker, _ngZone, _document) { this._checker = _checker; this._ngZone = _ngZone; this._document = _document; } /** * Creates a focus-trapped region around the given element. * @param element The element around which focus will be trapped. * @param deferCaptureElements Defers the creation of focus-capturing elements to be done * manually by the user. * @returns The created focus trap instance. */ create(element, deferCaptureElements = false) { return new FocusTrap(element, this._checker, this._ngZone, this._document, deferCaptureElements); } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusTrapFactory, deps: [{ token: i1.InteractivityChecker }, { token: i0.NgZone }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable }); } static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusTrapFactory, providedIn: 'root' }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusTrapFactory, decorators: [{ type: Injectable, args: [{ providedIn: 'root' }] }], ctorParameters: function () { return [{ type: i1.InteractivityChecker }, { type: i0.NgZone }, { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT] }] }]; } }); /** Directive for trapping focus within a region. */ export class CdkTrapFocus { /** Whether the focus trap is active. */ get enabled() { return this.focusTrap.enabled; } set enabled(value) { this.focusTrap.enabled = coerceBooleanProperty(value); } /** * Whether the directive should automatically move focus into the trapped region upon * initialization and return focus to the previous activeElement upon destruction. */ get autoCapture() { return this._autoCapture; } set autoCapture(value) { this._autoCapture = coerceBooleanProperty(value); } constructor(_elementRef, _focusTrapFactory, /** * @deprecated No longer being used. To be removed. * @breaking-change 13.0.0 */ _document) { this._elementRef = _elementRef; this._focusTrapFactory = _focusTrapFactory; /** Previously focused element to restore focus to upon destroy when using autoCapture. */ this._previouslyFocusedElement = null; this.focusTrap = this._focusTrapFactory.create(this._elementRef.nativeElement, true); } ngOnDestroy() { this.focusTrap.destroy(); // If we stored a previously focused element when using autoCapture, return focus to that // element now that the trapped region is being destroyed. if (this._previouslyFocusedElement) { this._previouslyFocusedElement.focus(); this._previouslyFocusedElement = null; } } ngAfterContentInit() { this.focusTrap.attachAnchors(); if (this.autoCapture) { this._captureFocus(); } } ngDoCheck() { if (!this.focusTrap.hasAttached()) { this.focusTrap.attachAnchors(); } } ngOnChanges(changes) { const autoCaptureChange = changes['autoCapture']; if (autoCaptureChange && !autoCaptureChange.firstChange && this.autoCapture && this.focusTrap.hasAttached()) { this._captureFocus(); } } _captureFocus() { this._previouslyFocusedElement = _getFocusedElementPierceShadowDom(); this.focusTrap.focusInitialElementWhenReady(); } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkTrapFocus, deps: [{ token: i0.ElementRef }, { token: FocusTrapFactory }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Directive }); } static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkTrapFocus, selector: "[cdkTrapFocus]", inputs: { enabled: ["cdkTrapFocus", "enabled"], autoCapture: ["cdkTrapFocusAutoCapture", "autoCapture"] }, exportAs: ["cdkTrapFocus"], usesOnChanges: true, ngImport: i0 }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkTrapFocus, decorators: [{ type: Directive, args: [{ selector: '[cdkTrapFocus]', exportAs: 'cdkTrapFocus', }] }], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: FocusTrapFactory }, { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT] }] }]; }, propDecorators: { enabled: [{ type: Input, args: ['cdkTrapFocus'] }], autoCapture: [{ type: Input, args: ['cdkTrapFocusAutoCapture'] }] } }); //# 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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 {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';\nimport {_getFocusedElementPierceShadowDom} from '@angular/cdk/platform';\nimport {DOCUMENT} from '@angular/common';\nimport {\n  AfterContentInit,\n  Directive,\n  ElementRef,\n  Inject,\n  Injectable,\n  Input,\n  NgZone,\n  OnDestroy,\n  DoCheck,\n  SimpleChanges,\n  OnChanges,\n} from '@angular/core';\nimport {take} from 'rxjs/operators';\nimport {InteractivityChecker} from '../interactivity-checker/interactivity-checker';\n\n/**\n * Class that allows for trapping focus within a DOM element.\n *\n * This class currently uses a relatively simple approach to focus trapping.\n * It assumes that the tab order is the same as DOM order, which is not necessarily true.\n * Things like `tabIndex > 0`, flex `order`, and shadow roots can cause the two to be misaligned.\n *\n * @deprecated Use `ConfigurableFocusTrap` instead.\n * @breaking-change 11.0.0\n */\nexport class FocusTrap {\n  private _startAnchor: HTMLElement | null;\n  private _endAnchor: HTMLElement | null;\n  private _hasAttached = false;\n\n  // Event listeners for the anchors. Need to be regular functions so that we can unbind them later.\n  protected startAnchorListener = () => this.focusLastTabbableElement();\n  protected endAnchorListener = () => this.focusFirstTabbableElement();\n\n  /** Whether the focus trap is active. */\n  get enabled(): boolean {\n    return this._enabled;\n  }\n  set enabled(value: boolean) {\n    this._enabled = value;\n\n    if (this._startAnchor && this._endAnchor) {\n      this._toggleAnchorTabIndex(value, this._startAnchor);\n      this._toggleAnchorTabIndex(value, this._endAnchor);\n    }\n  }\n  protected _enabled: boolean = true;\n\n  constructor(\n    readonly _element: HTMLElement,\n    private _checker: InteractivityChecker,\n    readonly _ngZone: NgZone,\n    readonly _document: Document,\n    deferAnchors = false,\n  ) {\n    if (!deferAnchors) {\n      this.attachAnchors();\n    }\n  }\n\n  /** Destroys the focus trap by cleaning up the anchors. */\n  destroy() {\n    const startAnchor = this._startAnchor;\n    const endAnchor = this._endAnchor;\n\n    if (startAnchor) {\n      startAnchor.removeEventListener('focus', this.startAnchorListener);\n      startAnchor.remove();\n    }\n\n    if (endAnchor) {\n      endAnchor.removeEventListener('focus', this.endAnchorListener);\n      endAnchor.remove();\n    }\n\n    this._startAnchor = this._endAnchor = null;\n    this._hasAttached = false;\n  }\n\n  /**\n   * Inserts the anchors into the DOM. This is usually done automatically\n   * in the constructor, but can be deferred for cases like directives with `*ngIf`.\n   * @returns Whether the focus trap managed to attach successfully. This may not be the case\n   * if the target element isn't currently in the DOM.\n   */\n  attachAnchors(): boolean {\n    // If we're not on the browser, there can be no focus to trap.\n    if (this._hasAttached) {\n      return true;\n    }\n\n    this._ngZone.runOutsideAngular(() => {\n      if (!this._startAnchor) {\n        this._startAnchor = this._createAnchor();\n        this._startAnchor!.addEventListener('focus', this.startAnchorListener);\n      }\n\n      if (!this._endAnchor) {\n        this._endAnchor = this._createAnchor();\n        this._endAnchor!.addEventListener('focus', this.endAnchorListener);\n      }\n    });\n\n    if (this._element.parentNode) {\n      this._element.parentNode.insertBefore(this._startAnchor!, this._element);\n      this._element.parentNode.insertBefore(this._endAnchor!, this._element.nextSibling);\n      this._hasAttached = true;\n    }\n\n    return this._hasAttached;\n  }\n\n  /**\n   * Waits for the zone to stabilize, then focuses the first tabbable element.\n   * @returns Returns a promise that resolves with a boolean, depending\n   * on whether focus was moved successfully.\n   */\n  focusInitialElementWhenReady(options?: FocusOptions): Promise<boolean> {\n    return new Promise<boolean>(resolve => {\n      this._executeOnStable(() => resolve(this.focusInitialElement(options)));\n    });\n  }\n\n  /**\n   * Waits for the zone to stabilize, then focuses\n   * the first tabbable element within the focus trap region.\n   * @returns Returns a promise that resolves with a boolean, depending\n   * on whether focus was moved successfully.\n   */\n  focusFirstTabbableElementWhenReady(options?: FocusOptions): Promise<boolean> {\n    return new Promise<boolean>(resolve => {\n      this._executeOnStable(() => resolve(this.focusFirstTabbableElement(options)));\n    });\n  }\n\n  /**\n   * Waits for the zone to stabilize, then focuses\n   * the last tabbable element within the focus trap region.\n   * @returns Returns a promise that resolves with a boolean, depending\n   * on whether focus was moved successfully.\n   */\n  focusLastTabbableElementWhenReady(options?: FocusOptions): Promise<boolean> {\n    return new Promise<boolean>(resolve => {\n      this._executeOnStable(() => resolve(this.focusLastTabbableElement(options)));\n    });\n  }\n\n  /**\n   * Get the specified boundary element of the trapped region.\n   * @param bound The boundary to get (start or end of trapped region).\n   * @returns The boundary element.\n   */\n  private _getRegionBoundary(bound: 'start' | 'end'): HTMLElement | null {\n    // Contains the deprecated version of selector, for temporary backwards comparability.\n    const markers = this._element.querySelectorAll(\n      `[cdk-focus-region-${bound}], ` + `[cdkFocusRegion${bound}], ` + `[cdk-focus-${bound}]`,\n    ) as NodeListOf<HTMLElement>;\n\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      for (let i = 0; i < markers.length; i++) {\n        // @breaking-change 8.0.0\n        if (markers[i].hasAttribute(`cdk-focus-${bound}`)) {\n          console.warn(\n            `Found use of deprecated attribute 'cdk-focus-${bound}', ` +\n              `use 'cdkFocusRegion${bound}' instead. The deprecated ` +\n              `attribute will be removed in 8.0.0.`,\n            markers[i],\n          );\n        } else if (markers[i].hasAttribute(`cdk-focus-region-${bound}`)) {\n          console.warn(\n            `Found use of deprecated attribute 'cdk-focus-region-${bound}', ` +\n              `use 'cdkFocusRegion${bound}' instead. The deprecated attribute ` +\n              `will be removed in 8.0.0.`,\n            markers[i],\n          );\n        }\n      }\n    }\n\n    if (bound == 'start') {\n      return markers.length ? markers[0] : this._getFirstTabbableElement(this._element);\n    }\n    return markers.length\n      ? markers[markers.length - 1]\n      : this._getLastTabbableElement(this._element);\n  }\n\n  /**\n   * Focuses the element that should be focused when the focus trap is initialized.\n   * @returns Whether focus was moved successfully.\n   */\n  focusInitialElement(options?: FocusOptions): boolean {\n    // Contains the deprecated version of selector, for temporary backwards comparability.\n    const redirectToElement = this._element.querySelector(\n      `[cdk-focus-initial], ` + `[cdkFocusInitial]`,\n    ) as HTMLElement;\n\n    if (redirectToElement) {\n      // @breaking-change 8.0.0\n      if (\n        (typeof ngDevMode === 'undefined' || ngDevMode) &&\n        redirectToElement.hasAttribute(`cdk-focus-initial`)\n      ) {\n        console.warn(\n          `Found use of deprecated attribute 'cdk-focus-initial', ` +\n            `use 'cdkFocusInitial' instead. The deprecated attribute ` +\n            `will be removed in 8.0.0`,\n          redirectToElement,\n        );\n      }\n\n      // Warn the consumer if the element they've pointed to\n      // isn't focusable, when not in production mode.\n      if (\n        (typeof ngDevMode === 'undefined' || ngDevMode) &&\n        !this._checker.isFocusable(redirectToElement)\n      ) {\n        console.warn(`Element matching '[cdkFocusInitial]' is not focusable.`, redirectToElement);\n      }\n\n      if (!this._checker.isFocusable(redirectToElement)) {\n        const focusableChild = this._getFirstTabbableElement(redirectToElement) as HTMLElement;\n        focusableChild?.focus(options);\n        return !!focusableChild;\n      }\n\n      redirectToElement.focus(options);\n      return true;\n    }\n\n    return this.focusFirstTabbableElement(options);\n  }\n\n  /**\n   * Focuses the first tabbable element within the focus trap region.\n   * @returns Whether focus was moved successfully.\n   */\n  focusFirstTabbableElement(options?: FocusOptions): boolean {\n    const redirectToElement = this._getRegionBoundary('start');\n\n    if (redirectToElement) {\n      redirectToElement.focus(options);\n    }\n\n    return !!redirectToElement;\n  }\n\n  /**\n   * Focuses the last tabbable element within the focus trap region.\n   * @returns Whether focus was moved successfully.\n   */\n  focusLastTabbableElement(options?: FocusOptions): boolean {\n    const redirectToElement = this._getRegionBoundary('end');\n\n    if (redirectToElement) {\n      redirectToElement.focus(options);\n    }\n\n    return !!redirectToElement;\n  }\n\n  /**\n   * Checks whether the focus trap has successfully been attached.\n   */\n  hasAttached(): boolean {\n    return this._hasAttached;\n  }\n\n  /** Get the first tabbable element from a DOM subtree (inclusive). */\n  private _getFirstTabbableElement(root: HTMLElement): HTMLElement | null {\n    if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {\n      return root;\n    }\n\n    const children = root.children;\n\n    for (let i = 0; i < children.length; i++) {\n      const tabbableChild =\n        children[i].nodeType === this._document.ELEMENT_NODE\n          ? this._getFirstTabbableElement(children[i] as HTMLElement)\n          : null;\n\n      if (tabbableChild) {\n        return tabbableChild;\n      }\n    }\n\n    return null;\n  }\n\n  /** Get the last tabbable element from a DOM subtree (inclusive). */\n  private _getLastTabbableElement(root: HTMLElement): HTMLElement | null {\n    if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {\n      return root;\n    }\n\n    // Iterate in reverse DOM order.\n    const children = root.children;\n\n    for (let i = children.length - 1; i >= 0; i--) {\n      const tabbableChild =\n        children[i].nodeType === this._document.ELEMENT_NODE\n          ? this._getLastTabbableElement(children[i] as HTMLElement)\n          : null;\n\n      if (tabbableChild) {\n        return tabbableChild;\n      }\n    }\n\n    return null;\n  }\n\n  /** Creates an anchor element. */\n  private _createAnchor(): HTMLElement {\n    const anchor = this._document.createElement('div');\n    this._toggleAnchorTabIndex(this._enabled, anchor);\n    anchor.classList.add('cdk-visually-hidden');\n    anchor.classList.add('cdk-focus-trap-anchor');\n    anchor.setAttribute('aria-hidden', 'true');\n    return anchor;\n  }\n\n  /**\n   * Toggles the `tabindex` of an anchor, based on the enabled state of the focus trap.\n   * @param isEnabled Whether the focus trap is enabled.\n   * @param anchor Anchor on which to toggle the tabindex.\n   */\n  private _toggleAnchorTabIndex(isEnabled: boolean, anchor: HTMLElement) {\n    // Remove the tabindex completely, rather than setting it to -1, because if the\n    // element has a tabindex, the user might still hit it when navigating with the arrow keys.\n    isEnabled ? anchor.setAttribute('tabindex', '0') : anchor.removeAttribute('tabindex');\n  }\n\n  /**\n   * Toggles the`tabindex` of both anchors to either trap Tab focus or allow it to escape.\n   * @param enabled: Whether the anchors should trap Tab.\n   */\n  protected toggleAnchors(enabled: boolean) {\n    if (this._startAnchor && this._endAnchor) {\n      this._toggleAnchorTabIndex(enabled, this._startAnchor);\n      this._toggleAnchorTabIndex(enabled, this._endAnchor);\n    }\n  }\n\n  /** Executes a function when the zone is stable. */\n  private _executeOnStable(fn: () => any): void {\n    if (this._ngZone.isStable) {\n      fn();\n    } else {\n      this._ngZone.onStable.pipe(take(1)).subscribe(fn);\n    }\n  }\n}\n\n/**\n * Factory that allows easy instantiation of focus traps.\n * @deprecated Use `ConfigurableFocusTrapFactory` instead.\n * @breaking-change 11.0.0\n */\n@Injectable({providedIn: 'root'})\nexport class FocusTrapFactory {\n  private _document: Document;\n\n  constructor(\n    private _checker: InteractivityChecker,\n    private _ngZone: NgZone,\n    @Inject(DOCUMENT) _document: any,\n  ) {\n    this._document = _document;\n  }\n\n  /**\n   * Creates a focus-trapped region around the given element.\n   * @param element The element around which focus will be trapped.\n   * @param deferCaptureElements Defers the creation of focus-capturing elements to be done\n   *     manually by the user.\n   * @returns The created focus trap instance.\n   */\n  create(element: HTMLElement, deferCaptureElements: boolean = false): FocusTrap {\n    return new FocusTrap(\n      element,\n      this._checker,\n      this._ngZone,\n      this._document,\n      deferCaptureElements,\n    );\n  }\n}\n\n/** Directive for trapping focus within a region. */\n@Directive({\n  selector: '[cdkTrapFocus]',\n  exportAs: 'cdkTrapFocus',\n})\nexport class CdkTrapFocus implements OnDestroy, AfterContentInit, OnChanges, DoCheck {\n  /** Underlying FocusTrap instance. */\n  focusTrap: FocusTrap;\n\n  /** Previously focused element to restore focus to upon destroy when using autoCapture. */\n  private _previouslyFocusedElement: HTMLElement | null = null;\n\n  /** Whether the focus trap is active. */\n  @Input('cdkTrapFocus')\n  get enabled(): boolean {\n    return this.focusTrap.enabled;\n  }\n  set enabled(value: BooleanInput) {\n    this.focusTrap.enabled = coerceBooleanProperty(value);\n  }\n\n  /**\n   * Whether the directive should automatically move focus into the trapped region upon\n   * initialization and return focus to the previous activeElement upon destruction.\n   */\n  @Input('cdkTrapFocusAutoCapture')\n  get autoCapture(): boolean {\n    return this._autoCapture;\n  }\n  set autoCapture(value: BooleanInput) {\n    this._autoCapture = coerceBooleanProperty(value);\n  }\n  private _autoCapture: boolean;\n\n  constructor(\n    private _elementRef: ElementRef<HTMLElement>,\n    private _focusTrapFactory: FocusTrapFactory,\n    /**\n     * @deprecated No longer being used. To be removed.\n     * @breaking-change 13.0.0\n     */\n    @Inject(DOCUMENT) _document: any,\n  ) {\n    this.focusTrap = this._focusTrapFactory.create(this._elementRef.nativeElement, true);\n  }\n\n  ngOnDestroy() {\n    this.focusTrap.destroy();\n\n    // If we stored a previously focused element when using autoCapture, return focus to that\n    // element now that the trapped region is being destroyed.\n    if (this._previouslyFocusedElement) {\n      this._previouslyFocusedElement.focus();\n      this._previouslyFocusedElement = null;\n    }\n  }\n\n  ngAfterContentInit() {\n    this.focusTrap.attachAnchors();\n\n    if (this.autoCapture) {\n      this._captureFocus();\n    }\n  }\n\n  ngDoCheck() {\n    if (!this.focusTrap.hasAttached()) {\n      this.focusTrap.attachAnchors();\n    }\n  }\n\n  ngOnChanges(changes: SimpleChanges) {\n    const autoCaptureChange = changes['autoCapture'];\n\n    if (\n      autoCaptureChange &&\n      !autoCaptureChange.firstChange &&\n      this.autoCapture &&\n      this.focusTrap.hasAttached()\n    ) {\n      this._captureFocus();\n    }\n  }\n\n  private _captureFocus() {\n    this._previouslyFocusedElement = _getFocusedElementPierceShadowDom();\n    this.focusTrap.focusInitialElementWhenReady();\n  }\n}\n"]}