@angular/cdk
Version:
Angular Material Component Development Kit
383 lines • 49.6 kB
JavaScript
/**
* @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 { DOCUMENT } from '@angular/common';
import { Directive, ElementRef, Inject, Injectable, Input, NgZone, isDevMode, } 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";
import * as i2 from "@angular/common";
/**
* 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 misalign.
*
* @deprecated Use `ConfigurableFocusTrap` instead.
* @breaking-change for 11.0.0 Remove this class.
*/
export class FocusTrap {
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();
}
}
/** 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);
}
}
/** 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);
if (startAnchor.parentNode) {
startAnchor.parentNode.removeChild(startAnchor);
}
}
if (endAnchor) {
endAnchor.removeEventListener('focus', this.endAnchorListener);
if (endAnchor.parentNode) {
endAnchor.parentNode.removeChild(endAnchor);
}
}
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 successfuly. 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 either focuses the first element that the
* user specified, or the first tabbable element.
* @returns Returns a promise that resolves with a boolean, depending
* on whether focus was moved successfuly.
*/
focusInitialElementWhenReady() {
return new Promise(resolve => {
this._executeOnStable(() => resolve(this.focusInitialElement()));
});
}
/**
* 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 successfuly.
*/
focusFirstTabbableElementWhenReady() {
return new Promise(resolve => {
this._executeOnStable(() => resolve(this.focusFirstTabbableElement()));
});
}
/**
* 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 successfuly.
*/
focusLastTabbableElementWhenReady() {
return new Promise(resolve => {
this._executeOnStable(() => resolve(this.focusLastTabbableElement()));
});
}
/**
* 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.
let markers = this._element.querySelectorAll(`[cdk-focus-region-${bound}], ` +
`[cdkFocusRegion${bound}], ` +
`[cdk-focus-${bound}]`);
for (let i = 0; i < markers.length; i++) {
// @breaking-change 8.0.0
if (markers[i].hasAttribute(`cdk-focus-${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 successfuly.
*/
focusInitialElement() {
// 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 (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 (isDevMode() && !this._checker.isFocusable(redirectToElement)) {
console.warn(`Element matching '[cdkFocusInitial]' is not focusable.`, redirectToElement);
}
redirectToElement.focus();
return true;
}
return this.focusFirstTabbableElement();
}
/**
* Focuses the first tabbable element within the focus trap region.
* @returns Whether focus was moved successfuly.
*/
focusFirstTabbableElement() {
const redirectToElement = this._getRegionBoundary('start');
if (redirectToElement) {
redirectToElement.focus();
}
return !!redirectToElement;
}
/**
* Focuses the last tabbable element within the focus trap region.
* @returns Whether focus was moved successfuly.
*/
focusLastTabbableElement() {
const redirectToElement = this._getRegionBoundary('end');
if (redirectToElement) {
redirectToElement.focus();
}
return !!redirectToElement;
}
/**
* Checks whether the focus trap has successfuly 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;
}
// Iterate in DOM order. Note that IE doesn't have `children` for SVG so we fall
// back to `childNodes` which includes text nodes, comments etc.
let children = root.children || root.childNodes;
for (let i = 0; i < children.length; i++) {
let 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.
let children = root.children || root.childNodes;
for (let i = children.length - 1; i >= 0; i--) {
let 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.asObservable().pipe(take(1)).subscribe(fn);
}
}
}
/**
* Factory that allows easy instantiation of focus traps.
* @deprecated Use `ConfigurableFocusTrapFactory` instead.
* @breaking-change for 11.0.0 Remove this class.
*/
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);
}
}
FocusTrapFactory.ɵprov = i0.ɵɵdefineInjectable({ factory: function FocusTrapFactory_Factory() { return new FocusTrapFactory(i0.ɵɵinject(i1.InteractivityChecker), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(i2.DOCUMENT)); }, token: FocusTrapFactory, providedIn: "root" });
FocusTrapFactory.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
FocusTrapFactory.ctorParameters = () => [
{ type: InteractivityChecker },
{ type: NgZone },
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }
];
/** Directive for trapping focus within a region. */
export class CdkTrapFocus {
constructor(_elementRef, _focusTrapFactory, _document) {
this._elementRef = _elementRef;
this._focusTrapFactory = _focusTrapFactory;
/** Previously focused element to restore focus to upon destroy when using autoCapture. */
this._previouslyFocusedElement = null;
this._document = _document;
this.focusTrap = this._focusTrapFactory.create(this._elementRef.nativeElement, true);
}
/** Whether the focus trap is active. */
get enabled() { return this.focusTrap.enabled; }
set enabled(value) { this.focusTrap.enabled = coerceBooleanProperty(value); }
/**
* Whether the directive should automatially 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); }
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 = this._document.activeElement;
this.focusTrap.focusInitialElementWhenReady();
}
}
CdkTrapFocus.decorators = [
{ type: Directive, args: [{
selector: '[cdkTrapFocus]',
exportAs: 'cdkTrapFocus',
},] }
];
CdkTrapFocus.ctorParameters = () => [
{ type: ElementRef },
{ type: FocusTrapFactory },
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }
];
CdkTrapFocus.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 {DOCUMENT} from '@angular/common';\nimport {\n  AfterContentInit,\n  Directive,\n  ElementRef,\n  Inject,\n  Injectable,\n  Input,\n  NgZone,\n  OnDestroy,\n  DoCheck,\n  isDevMode,\n  SimpleChanges,\n  OnChanges,\n} from '@angular/core';\nimport {take} from 'rxjs/operators';\nimport {InteractivityChecker} from '../interactivity-checker/interactivity-checker';\n\n\n/**\n * Class that allows for trapping focus within a DOM element.\n *\n * This class currently uses a relatively simple approach to focus trapping.\n * It assumes that the tab order is the same as DOM order, which is not necessarily true.\n * Things like `tabIndex > 0`, flex `order`, and shadow roots can cause the two to misalign.\n *\n * @deprecated Use `ConfigurableFocusTrap` instead.\n * @breaking-change for 11.0.0 Remove this class.\n */\nexport class FocusTrap {\n  private _startAnchor: HTMLElement | null;\n  private _endAnchor: HTMLElement | null;\n  private _hasAttached = false;\n\n  // Event listeners for the anchors. Need to be regular functions so that we can unbind them later.\n  protected startAnchorListener = () => this.focusLastTabbableElement();\n  protected endAnchorListener = () => this.focusFirstTabbableElement();\n\n  /** Whether the focus trap is active. */\n  get enabled(): boolean { return this._enabled; }\n  set enabled(value: boolean) {\n    this._enabled = value;\n\n    if (this._startAnchor && this._endAnchor) {\n      this._toggleAnchorTabIndex(value, this._startAnchor);\n      this._toggleAnchorTabIndex(value, this._endAnchor);\n    }\n  }\n  protected _enabled: boolean = true;\n\n  constructor(\n    readonly _element: HTMLElement,\n    private _checker: InteractivityChecker,\n    readonly _ngZone: NgZone,\n    readonly _document: Document,\n    deferAnchors = false) {\n\n    if (!deferAnchors) {\n      this.attachAnchors();\n    }\n  }\n\n  /** Destroys the focus trap by cleaning up the anchors. */\n  destroy() {\n    const startAnchor = this._startAnchor;\n    const endAnchor = this._endAnchor;\n\n    if (startAnchor) {\n      startAnchor.removeEventListener('focus', this.startAnchorListener);\n\n      if (startAnchor.parentNode) {\n        startAnchor.parentNode.removeChild(startAnchor);\n      }\n    }\n\n    if (endAnchor) {\n      endAnchor.removeEventListener('focus', this.endAnchorListener);\n\n      if (endAnchor.parentNode) {\n        endAnchor.parentNode.removeChild(endAnchor);\n      }\n    }\n\n    this._startAnchor = this._endAnchor = null;\n    this._hasAttached = false;\n  }\n\n  /**\n   * Inserts the anchors into the DOM. This is usually done automatically\n   * in the constructor, but can be deferred for cases like directives with `*ngIf`.\n   * @returns Whether the focus trap managed to attach successfuly. This may not be the case\n   * if the target element isn't currently in the DOM.\n   */\n  attachAnchors(): boolean {\n    // If we're not on the browser, there can be no focus to trap.\n    if (this._hasAttached) {\n      return true;\n    }\n\n    this._ngZone.runOutsideAngular(() => {\n      if (!this._startAnchor) {\n        this._startAnchor = this._createAnchor();\n        this._startAnchor!.addEventListener('focus', this.startAnchorListener);\n      }\n\n      if (!this._endAnchor) {\n        this._endAnchor = this._createAnchor();\n        this._endAnchor!.addEventListener('focus', this.endAnchorListener);\n      }\n    });\n\n    if (this._element.parentNode) {\n      this._element.parentNode.insertBefore(this._startAnchor!, this._element);\n      this._element.parentNode.insertBefore(this._endAnchor!, this._element.nextSibling);\n      this._hasAttached = true;\n    }\n\n    return this._hasAttached;\n  }\n\n  /**\n   * Waits for the zone to stabilize, then either focuses the first element that the\n   * user specified, or the first tabbable element.\n   * @returns Returns a promise that resolves with a boolean, depending\n   * on whether focus was moved successfuly.\n   */\n  focusInitialElementWhenReady(): Promise<boolean> {\n    return new Promise<boolean>(resolve => {\n      this._executeOnStable(() => resolve(this.focusInitialElement()));\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 successfuly.\n   */\n  focusFirstTabbableElementWhenReady(): Promise<boolean> {\n    return new Promise<boolean>(resolve => {\n      this._executeOnStable(() => resolve(this.focusFirstTabbableElement()));\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 successfuly.\n   */\n  focusLastTabbableElementWhenReady(): Promise<boolean> {\n    return new Promise<boolean>(resolve => {\n      this._executeOnStable(() => resolve(this.focusLastTabbableElement()));\n    });\n  }\n\n  /**\n   * Get the specified boundary element of the trapped region.\n   * @param bound The boundary to get (start or end of trapped region).\n   * @returns The boundary element.\n   */\n  private _getRegionBoundary(bound: 'start' | 'end'): HTMLElement | null {\n    // Contains the deprecated version of selector, for temporary backwards comparability.\n    let markers = this._element.querySelectorAll(`[cdk-focus-region-${bound}], ` +\n                                                 `[cdkFocusRegion${bound}], ` +\n                                                 `[cdk-focus-${bound}]`) as NodeListOf<HTMLElement>;\n\n    for (let i = 0; i < markers.length; i++) {\n      // @breaking-change 8.0.0\n      if (markers[i].hasAttribute(`cdk-focus-${bound}`)) {\n        console.warn(`Found use of deprecated attribute 'cdk-focus-${bound}', ` +\n                     `use 'cdkFocusRegion${bound}' instead. The deprecated ` +\n                     `attribute will be removed in 8.0.0.`, markers[i]);\n      } else if (markers[i].hasAttribute(`cdk-focus-region-${bound}`)) {\n        console.warn(`Found use of deprecated attribute 'cdk-focus-region-${bound}', ` +\n                     `use 'cdkFocusRegion${bound}' instead. The deprecated attribute ` +\n                     `will be removed in 8.0.0.`, markers[i]);\n      }\n    }\n\n    if (bound == 'start') {\n      return markers.length ? markers[0] : this._getFirstTabbableElement(this._element);\n    }\n    return markers.length ?\n        markers[markers.length - 1] : this._getLastTabbableElement(this._element);\n  }\n\n  /**\n   * Focuses the element that should be focused when the focus trap is initialized.\n   * @returns Whether focus was moved successfuly.\n   */\n  focusInitialElement(): boolean {\n    // Contains the deprecated version of selector, for temporary backwards comparability.\n    const redirectToElement = this._element.querySelector(`[cdk-focus-initial], ` +\n                                                          `[cdkFocusInitial]`) as HTMLElement;\n\n    if (redirectToElement) {\n      // @breaking-change 8.0.0\n      if (redirectToElement.hasAttribute(`cdk-focus-initial`)) {\n        console.warn(`Found use of deprecated attribute 'cdk-focus-initial', ` +\n                    `use 'cdkFocusInitial' instead. The deprecated attribute ` +\n                    `will be removed in 8.0.0`, redirectToElement);\n      }\n\n      // Warn the consumer if the element they've pointed to\n      // isn't focusable, when not in production mode.\n      if (isDevMode() && !this._checker.isFocusable(redirectToElement)) {\n        console.warn(`Element matching '[cdkFocusInitial]' is not focusable.`, redirectToElement);\n      }\n\n      redirectToElement.focus();\n      return true;\n    }\n\n    return this.focusFirstTabbableElement();\n  }\n\n  /**\n   * Focuses the first tabbable element within the focus trap region.\n   * @returns Whether focus was moved successfuly.\n   */\n  focusFirstTabbableElement(): boolean {\n    const redirectToElement = this._getRegionBoundary('start');\n\n    if (redirectToElement) {\n      redirectToElement.focus();\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 successfuly.\n   */\n  focusLastTabbableElement(): boolean {\n    const redirectToElement = this._getRegionBoundary('end');\n\n    if (redirectToElement) {\n      redirectToElement.focus();\n    }\n\n    return !!redirectToElement;\n  }\n\n  /**\n   * Checks whether the focus trap has successfuly been attached.\n   */\n  hasAttached(): boolean {\n    return this._hasAttached;\n  }\n\n  /** Get the first tabbable element from a DOM subtree (inclusive). */\n  private _getFirstTabbableElement(root: HTMLElement): HTMLElement | null {\n    if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {\n      return root;\n    }\n\n    // Iterate in DOM order. Note that IE doesn't have `children` for SVG so we fall\n    // back to `childNodes` which includes text nodes, comments etc.\n    let children = root.children || root.childNodes;\n\n    for (let i = 0; i < children.length; i++) {\n      let tabbableChild = children[i].nodeType === this._document.ELEMENT_NODE ?\n        this._getFirstTabbableElement(children[i] as HTMLElement) :\n        null;\n\n      if (tabbableChild) {\n        return tabbableChild;\n      }\n    }\n\n    return null;\n  }\n\n  /** Get the last tabbable element from a DOM subtree (inclusive). */\n  private _getLastTabbableElement(root: HTMLElement): HTMLElement | null {\n    if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {\n      return root;\n    }\n\n    // Iterate in reverse DOM order.\n    let children = root.children || root.childNodes;\n\n    for (let i = children.length - 1; i >= 0; i--) {\n      let tabbableChild = children[i].nodeType === this._document.ELEMENT_NODE ?\n        this._getLastTabbableElement(children[i] as HTMLElement) :\n        null;\n\n      if (tabbableChild) {\n        return tabbableChild;\n      }\n    }\n\n    return null;\n  }\n\n  /** Creates an anchor element. */\n  private _createAnchor(): HTMLElement {\n    const anchor = this._document.createElement('div');\n    this._toggleAnchorTabIndex(this._enabled, anchor);\n    anchor.classList.add('cdk-visually-hidden');\n    anchor.classList.add('cdk-focus-trap-anchor');\n    anchor.setAttribute('aria-hidden', 'true');\n    return anchor;\n  }\n\n  /**\n   * Toggles the `tabindex` of an anchor, based on the enabled state of the focus trap.\n   * @param isEnabled Whether the focus trap is enabled.\n   * @param anchor Anchor on which to toggle the tabindex.\n   */\n  private _toggleAnchorTabIndex(isEnabled: boolean, anchor: HTMLElement) {\n    // Remove the tabindex completely, rather than setting it to -1, because if the\n    // element has a tabindex, the user might still hit it when navigating with the arrow keys.\n    isEnabled ? anchor.setAttribute('tabindex', '0') : anchor.removeAttribute('tabindex');\n  }\n\n  /**\n   * Toggles the`tabindex` of both anchors to either trap Tab focus or allow it to escape.\n   * @param enabled: Whether the anchors should trap Tab.\n   */\n  protected toggleAnchors(enabled: boolean) {\n    if (this._startAnchor && this._endAnchor) {\n      this._toggleAnchorTabIndex(enabled, this._startAnchor);\n      this._toggleAnchorTabIndex(enabled, this._endAnchor);\n    }\n  }\n\n  /** Executes a function when the zone is stable. */\n  private _executeOnStable(fn: () => any): void {\n    if (this._ngZone.isStable) {\n      fn();\n    } else {\n      this._ngZone.onStable.asObservable().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 for 11.0.0 Remove this class.\n */\n@Injectable({providedIn: 'root'})\nexport class FocusTrapFactory {\n  private _document: Document;\n\n  constructor(\n      private _checker: InteractivityChecker,\n      private _ngZone: NgZone,\n      @Inject(DOCUMENT) _document: any) {\n\n    this._document = _document;\n  }\n\n  /**\n   * Creates a focus-trapped region around the given element.\n   * @param element The element around which focus will be trapped.\n   * @param deferCaptureElements Defers the creation of focus-capturing elements to be done\n   *     manually by the user.\n   * @returns The created focus trap instance.\n   */\n  create(element: HTMLElement, deferCaptureElements: boolean = false): FocusTrap {\n    return new FocusTrap(\n        element, this._checker, this._ngZone, this._document, deferCaptureElements);\n  }\n}\n\n/** Directive for trapping focus within a region. */\n@Directive({\n  selector: '[cdkTrapFocus]',\n  exportAs: 'cdkTrapFocus',\n})\nexport class CdkTrapFocus implements OnDestroy, AfterContentInit, OnChanges, DoCheck {\n  private _document: Document;\n\n  /** Underlying FocusTrap instance. */\n  focusTrap: FocusTrap;\n\n  /** Previously focused element to restore focus to upon destroy when using autoCapture. */\n  private _previouslyFocusedElement: HTMLElement | null = null;\n\n  /** Whether the focus trap is active. */\n  @Input('cdkTrapFocus')\n  get enabled(): boolean { return this.focusTrap.enabled; }\n  set enabled(value: boolean) { this.focusTrap.enabled = coerceBooleanProperty(value); }\n\n  /**\n   * Whether the directive should automatially move focus into the trapped region upon\n   * initialization and return focus to the previous activeElement upon destruction.\n   */\n  @Input('cdkTrapFocusAutoCapture')\n  get autoCapture(): boolean { return this._autoCapture; }\n  set autoCapture(value: boolean) { this._autoCapture = coerceBooleanProperty(value); }\n  private _autoCapture: boolean;\n\n  constructor(\n      private _elementRef: ElementRef<HTMLElement>,\n      private _focusTrapFactory: FocusTrapFactory,\n      @Inject(DOCUMENT) _document: any) {\n\n    this._document = _document;\n    this.focusTrap = this._focusTrapFactory.create(this._elementRef.nativeElement, true);\n  }\n\n  ngOnDestroy() {\n    this.focusTrap.destroy();\n\n    // If we stored a previously focused element when using autoCapture, return focus to that\n    // element now that the trapped region is being destroyed.\n    if (this._previouslyFocusedElement) {\n      this._previouslyFocusedElement.focus();\n      this._previouslyFocusedElement = null;\n    }\n  }\n\n  ngAfterContentInit() {\n    this.focusTrap.attachAnchors();\n\n    if (this.autoCapture) {\n      this._captureFocus();\n    }\n  }\n\n  ngDoCheck() {\n    if (!this.focusTrap.hasAttached()) {\n      this.focusTrap.attachAnchors();\n    }\n  }\n\n  ngOnChanges(changes: SimpleChanges) {\n    const autoCaptureChange = changes['autoCapture'];\n\n    if (autoCaptureChange && !autoCaptureChange.firstChange && this.autoCapture &&\n        this.focusTrap.hasAttached()) {\n      this._captureFocus();\n    }\n  }\n\n  private _captureFocus() {\n    this._previouslyFocusedElement = this._document.activeElement as HTMLElement;\n    this.focusTrap.focusInitialElementWhenReady();\n  }\n\n  static ngAcceptInputType_enabled: BooleanInput;\n  static ngAcceptInputType_autoCapture: BooleanInput;\n}\n"]}