| /** |
| * @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, } 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 be misaligned. |
| * |
| * @deprecated Use `ConfigurableFocusTrap` instead. |
| * @breaking-change 11.0.0 |
| */ |
| 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 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 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 successfully. |
| */ |
| 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 successfully. |
| */ |
| 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 successfully. |
| */ |
| 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 successfully. |
| */ |
| 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 ((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 === null || focusableChild === void 0 ? void 0 : focusableChild.focus(); |
| return !!focusableChild; |
| } |
| redirectToElement.focus(); |
| return true; |
| } |
| return this.focusFirstTabbableElement(); |
| } |
| /** |
| * Focuses the first tabbable element within the focus trap region. |
| * @returns Whether focus was moved successfully. |
| */ |
| 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 successfully. |
| */ |
| focusLastTabbableElement() { |
| const redirectToElement = this._getRegionBoundary('end'); |
| if (redirectToElement) { |
| redirectToElement.focus(); |
| } |
| 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; |
| } |
| // 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.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); |
| } |
| } |
| 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 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); } |
| 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() { |
| var _a, _b; |
| // If the `activeElement` is inside a shadow root, `document.activeElement` will |
| // point to the shadow root so we have to descend into it ourselves. |
| const activeElement = (_a = this._document) === null || _a === void 0 ? void 0 : _a.activeElement; |
| this._previouslyFocusedElement = |
| ((_b = activeElement === null || activeElement === void 0 ? void 0 : activeElement.shadowRoot) === null || _b === void 0 ? void 0 : _b.activeElement) || 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  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 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 { 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 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 either focuses the first element that the\n   * user specified, or the first tabbable element.\n   * @returns Returns a promise that resolves with a boolean, depending\n   * on whether focus was moved successfully.\n   */\n  focusInitialElementWhenReady(): 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 successfully.\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 successfully.\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 successfully.\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 ((typeof ngDevMode === 'undefined' || ngDevMode) &&\n        !this._checker.isFocusable(redirectToElement)) {\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();\n        return !!focusableChild;\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 successfully.\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 successfully.\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 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    // 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.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, 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 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 { 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    // If the `activeElement` is inside a shadow root, `document.activeElement` will\n    // point to the shadow root so we have to descend into it ourselves.\n    const activeElement = this._document?.activeElement as HTMLElement|null;\n    this._previouslyFocusedElement =\n      activeElement?.shadowRoot?.activeElement as HTMLElement || activeElement;\n    this.focusTrap.focusInitialElementWhenReady();\n  }\n\n  static ngAcceptInputType_enabled: BooleanInput;\n  static ngAcceptInputType_autoCapture: BooleanInput;\n}\n"]} |