| 1 | 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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\n/* eslint-disable */\n\nimport { coerceBooleanProperty, BooleanInput } from './boolean-property';\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';\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 {\n return this._enabled;\n }\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\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 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\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 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: '[focusTrap]',\n exportAs: 'focusTrap'\n})\nexport class FocusTrapDirective 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 {\n return this.focusTrap.enabled;\n }\n\n set enabled(value: boolean) {\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\n set autoCapture(value: boolean) {\n this._autoCapture = coerceBooleanProperty(value);\n }\n\n private _autoCapture = false;\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"]} |