ngx-bootstrap/focus-trap/fesm2015/ngx-bootstrap-focus-trap.js

import { ɵɵdefineInjectable, Injectable, ɵɵinject, PLATFORM_ID, Inject, NgZone, Directive, ElementRef, Input, NgModule } from '@angular/core';
import { isPlatformBrowser, DOCUMENT, CommonModule } from '@angular/common';
import { take } from 'rxjs/operators';

/**
 * @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
 */
/** Injectable that ensures only the most recently enabled FocusTrap is active. */
class FocusTrapManager {
    constructor() {
        // A stack of the FocusTraps on the page. Only the FocusTrap at the
        // top of the stack is active.
        this._focusTrapStack = [];
    }
    /**
     * Disables the FocusTrap at the top of the stack, and then pushes
     * the new FocusTrap onto the stack.
     */
    register(focusTrap) {
        // Dedupe focusTraps that register multiple times.
        this._focusTrapStack = this._focusTrapStack.filter((ft) => ft !== focusTrap);
        let stack = this._focusTrapStack;
        if (stack.length) {
            stack[stack.length - 1]._disable();
        }
        stack.push(focusTrap);
        focusTrap._enable();
    }
    /**
     * Removes the FocusTrap from the stack, and activates the
     * FocusTrap that is the new top of the stack.
     */
    deregister(focusTrap) {
        focusTrap._disable();
        const stack = this._focusTrapStack;
        const i = stack.indexOf(focusTrap);
        if (i !== -1) {
            stack.splice(i, 1);
            if (stack.length) {
                stack[stack.length - 1]._enable();
            }
        }
    }
}
FocusTrapManager.ɵprov = ɵɵdefineInjectable({ factory: function FocusTrapManager_Factory() { return new FocusTrapManager(); }, token: FocusTrapManager, providedIn: "root" });
FocusTrapManager.decorators = [
    { type: Injectable, args: [{ providedIn: 'root' },] }
];

/**
 * @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
 */
// Whether the current platform supports the V8 Break Iterator. The V8 check
// is necessary to detect all Blink based browsers.
let hasV8BreakIterator;
// We need a try/catch around the reference to `Intl`, because accessing it in some cases can
// cause IE to throw. These cases are tied to particular versions of Windows and can happen if
// the consumer is providing a polyfilled `Map`. See:
// https://github.com/Microsoft/ChakraCore/issues/3189
// https://github.com/angular/components/issues/15687
try {
    hasV8BreakIterator = (typeof Intl !== 'undefined' && Intl.v8BreakIterator);
}
catch (_a) {
    hasV8BreakIterator = false;
}
/**
 * Service to detect the current platform by comparing the userAgent strings and
 * checking browser-specific global properties.
 */
class Platform {
    constructor(_platformId) {
        this._platformId = _platformId;
        // We want to use the Angular platform check because if the Document is shimmed
        // without the navigator, the following checks will fail. This is preferred because
        // sometimes the Document may be shimmed without the user's knowledge or intention
        /** Whether the Angular application is being rendered in the browser. */
        this.isBrowser = this._platformId ?
            isPlatformBrowser(this._platformId) : typeof document === 'object' && !!document;
        /** Whether the current browser is Microsoft Edge. */
        this.EDGE = this.isBrowser && /(edge)/i.test(navigator.userAgent);
        /** Whether the current rendering engine is Microsoft Trident. */
        this.TRIDENT = this.isBrowser && /(msie|trident)/i.test(navigator.userAgent);
        // EdgeHTML and Trident mock Blink specific things and need to be excluded from this check.
        /** Whether the current rendering engine is Blink. */
        this.BLINK = this.isBrowser && (!!(window.chrome || hasV8BreakIterator) &&
            typeof CSS !== 'undefined' && !this.EDGE && !this.TRIDENT);
        // Webkit is part of the userAgent in EdgeHTML, Blink and Trident. Therefore we need to
        // ensure that Webkit runs standalone and is not used as another engine's base.
        /** Whether the current rendering engine is WebKit. */
        this.WEBKIT = this.isBrowser &&
            /AppleWebKit/i.test(navigator.userAgent) && !this.BLINK && !this.EDGE && !this.TRIDENT;
        /** Whether the current platform is Apple iOS. */
        this.IOS = this.isBrowser && /iPad|iPhone|iPod/.test(navigator.userAgent) &&
            !('MSStream' in window);
        // It's difficult to detect the plain Gecko engine, because most of the browsers identify
        // them self as Gecko-like browsers and modify the userAgent's according to that.
        // Since we only cover one explicit Firefox case, we can simply check for Firefox
        // instead of having an unstable check for Gecko.
        /** Whether the current browser is Firefox. */
        this.FIREFOX = this.isBrowser && /(firefox|minefield)/i.test(navigator.userAgent);
        /** Whether the current platform is Android. */
        // Trident on mobile adds the android platform to the userAgent to trick detections.
        this.ANDROID = this.isBrowser && /android/i.test(navigator.userAgent) && !this.TRIDENT;
        // Safari browsers will include the Safari keyword in their userAgent. Some browsers may fake
        // this and just place the Safari keyword in the userAgent. To be more safe about Safari every
        // Safari browser should also use Webkit as its layout engine.
        /** Whether the current browser is Safari. */
        this.SAFARI = this.isBrowser && /safari/i.test(navigator.userAgent) && this.WEBKIT;
    }
}
Platform.ɵprov = ɵɵdefineInjectable({ factory: function Platform_Factory() { return new Platform(ɵɵinject(PLATFORM_ID)); }, token: Platform, providedIn: "root" });
Platform.decorators = [
    { type: Injectable, args: [{ providedIn: 'root' },] }
];
Platform.ctorParameters = () => [
    { type: Object, decorators: [{ type: Inject, args: [PLATFORM_ID,] }] }
];

/**
 * @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
 */
/**
 * Configuration for the isFocusable method.
 */
class IsFocusableConfig {
    constructor() {
        /**
         * Whether to count an element as focusable even if it is not currently visible.
         */
        this.ignoreVisibility = false;
    }
}
// The InteractivityChecker leans heavily on the ally.js accessibility utilities.
// Methods like `isTabbable` are only covering specific edge-cases for the browsers which are
// supported.
/**
 * Utility for checking the interactivity of an element, such as whether is is focusable or
 * tabbable.
 */
class InteractivityChecker {
    constructor(_platform) {
        this._platform = _platform;
    }
    /**
     * Gets whether an element is disabled.
     *
     * @param element Element to be checked.
     * @returns Whether the element is disabled.
     */
    isDisabled(element) {
        // This does not capture some cases, such as a non-form control with a disabled attribute or
        // a form control inside of a disabled form, but should capture the most common cases.
        return element.hasAttribute('disabled');
    }
    /**
     * Gets whether an element is visible for the purposes of interactivity.
     *
     * This will capture states like `display: none` and `visibility: hidden`, but not things like
     * being clipped by an `overflow: hidden` parent or being outside the viewport.
     *
     * @returns Whether the element is visible.
     */
    isVisible(element) {
        return hasGeometry(element) && getComputedStyle(element).visibility === 'visible';
    }
    /**
     * Gets whether an element can be reached via Tab key.
     * Assumes that the element has already been checked with isFocusable.
     *
     * @param element Element to be checked.
     * @returns Whether the element is tabbable.
     */
    isTabbable(element) {
        // Nothing is tabbable on the server 😎
        if (!this._platform.isBrowser) {
            return false;
        }
        const frameElement = getFrameElement(getWindow(element));
        if (frameElement) {
            // Frame elements inherit their tabindex onto all child elements.
            if (getTabIndexValue(frameElement) === -1) {
                return false;
            }
            // Browsers disable tabbing to an element inside of an invisible frame.
            if (!this.isVisible(frameElement)) {
                return false;
            }
        }
        let nodeName = element.nodeName.toLowerCase();
        let tabIndexValue = getTabIndexValue(element);
        if (element.hasAttribute('contenteditable')) {
            return tabIndexValue !== -1;
        }
        if (nodeName === 'iframe' || nodeName === 'object') {
            // The frame or object's content may be tabbable depending on the content, but it's
            // not possibly to reliably detect the content of the frames. We always consider such
            // elements as non-tabbable.
            return false;
        }
        // In iOS, the browser only considers some specific elements as tabbable.
        if (this._platform.WEBKIT && this._platform.IOS && !isPotentiallyTabbableIOS(element)) {
            return false;
        }
        if (nodeName === 'audio') {
            // Audio elements without controls enabled are never tabbable, regardless
            // of the tabindex attribute explicitly being set.
            if (!element.hasAttribute('controls')) {
                return false;
            }
            // Audio elements with controls are by default tabbable unless the
            // tabindex attribute is set to `-1` explicitly.
            return tabIndexValue !== -1;
        }
        if (nodeName === 'video') {
            // For all video elements, if the tabindex attribute is set to `-1`, the video
            // is not tabbable. Note: We cannot rely on the default `HTMLElement.tabIndex`
            // property as that one is set to `-1` in Chrome, Edge and Safari v13.1. The
            // tabindex attribute is the source of truth here.
            if (tabIndexValue === -1) {
                return false;
            }
            // If the tabindex is explicitly set, and not `-1` (as per check before), the
            // video element is always tabbable (regardless of whether it has controls or not).
            if (tabIndexValue !== null) {
                return true;
            }
            // Otherwise (when no explicit tabindex is set), a video is only tabbable if it
            // has controls enabled. Firefox is special as videos are always tabbable regardless
            // of whether there are controls or not.
            return this._platform.FIREFOX || element.hasAttribute('controls');
        }
        return element.tabIndex >= 0;
    }
    /**
     * Gets whether an element can be focused by the user.
     *
     * @param element Element to be checked.
     * @param config The config object with options to customize this method's behavior
     * @returns Whether the element is focusable.
     */
    isFocusable(element, config) {
        // Perform checks in order of left to most expensive.
        // Again, naive approach that does not capture many edge cases and browser quirks.
        return isPotentiallyFocusable(element) && !this.isDisabled(element) &&
            ((config === null || config === void 0 ? void 0 : config.ignoreVisibility) || this.isVisible(element));
    }
}
InteractivityChecker.ɵprov = ɵɵdefineInjectable({ factory: function InteractivityChecker_Factory() { return new InteractivityChecker(ɵɵinject(Platform)); }, token: InteractivityChecker, providedIn: "root" });
InteractivityChecker.decorators = [
    { type: Injectable, args: [{ providedIn: 'root' },] }
];
InteractivityChecker.ctorParameters = () => [
    { type: Platform }
];
/**
 * Returns the frame element from a window object. Since browsers like MS Edge throw errors if
 * the frameElement property is being accessed from a different host address, this property
 * should be accessed carefully.
 */
function getFrameElement(window) {
    try {
        return window.frameElement;
    }
    catch (_a) {
        return null;
    }
}
/** Checks whether the specified element has any geometry / rectangles. */
function hasGeometry(element) {
    // Use logic from jQuery to check for an invisible element.
    // See https://github.com/jquery/jquery/blob/master/src/css/hiddenVisibleSelectors.js#L12
    return !!(element.offsetWidth || element.offsetHeight ||
        (typeof element.getClientRects === 'function' && element.getClientRects().length));
}
/** Gets whether an element's  */
function isNativeFormElement(element) {
    let nodeName = element.nodeName.toLowerCase();
    return nodeName === 'input' ||
        nodeName === 'select' ||
        nodeName === 'button' ||
        nodeName === 'textarea';
}
/** Gets whether an element is an `<input type="hidden">`. */
function isHiddenInput(element) {
    return isInputElement(element) && element.type == 'hidden';
}
/** Gets whether an element is an anchor that has an href attribute. */
function isAnchorWithHref(element) {
    return isAnchorElement(element) && element.hasAttribute('href');
}
/** Gets whether an element is an input element. */
function isInputElement(element) {
    return element.nodeName.toLowerCase() == 'input';
}
/** Gets whether an element is an anchor element. */
function isAnchorElement(element) {
    return element.nodeName.toLowerCase() == 'a';
}
/** Gets whether an element has a valid tabindex. */
function hasValidTabIndex(element) {
    if (!element.hasAttribute('tabindex') || element.tabIndex === undefined) {
        return false;
    }
    let tabIndex = element.getAttribute('tabindex');
    // IE11 parses tabindex="" as the value "-32768"
    if (tabIndex == '-32768') {
        return false;
    }
    return !!(tabIndex && !isNaN(parseInt(tabIndex, 10)));
}
/**
 * Returns the parsed tabindex from the element attributes instead of returning the
 * evaluated tabindex from the browsers defaults.
 */
function getTabIndexValue(element) {
    if (!hasValidTabIndex(element)) {
        return null;
    }
    // See browser issue in Gecko https://bugzilla.mozilla.org/show_bug.cgi?id=1128054
    const tabIndex = parseInt(element.getAttribute('tabindex') || '', 10);
    return isNaN(tabIndex) ? -1 : tabIndex;
}
/** Checks whether the specified element is potentially tabbable on iOS */
function isPotentiallyTabbableIOS(element) {
    let nodeName = element.nodeName.toLowerCase();
    let inputType = nodeName === 'input' && element.type;
    return inputType === 'text'
        || inputType === 'password'
        || nodeName === 'select'
        || nodeName === 'textarea';
}
/**
 * Gets whether an element is potentially focusable without taking current visible/disabled state
 * into account.
 */
function isPotentiallyFocusable(element) {
    // Inputs are potentially focusable *unless* they're type="hidden".
    if (isHiddenInput(element)) {
        return false;
    }
    return isNativeFormElement(element) ||
        isAnchorWithHref(element) ||
        element.hasAttribute('contenteditable') ||
        hasValidTabIndex(element);
}
/** Gets the parent window of a DOM node with regards of being inside of an iframe. */
function getWindow(node) {
    // ownerDocument is null if `node` itself *is* a document.
    return node.ownerDocument && node.ownerDocument.defaultView || window;
}

/**
 * @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
 */
/** Coerces a data-bound value (typically a string) to a boolean. */
function coerceBooleanProperty(value) {
    return value != null && `${value}` !== 'false';
}

/**
 * @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
 */
/**
 * 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.
 */
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 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 (!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 for 11.0.0 Remove this class.
 */
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 = ɵɵdefineInjectable({ factory: function FocusTrapFactory_Factory() { return new FocusTrapFactory(ɵɵinject(InteractivityChecker), ɵɵinject(NgZone), ɵɵinject(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. */
class FocusTrapDirective {
    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._autoCapture = false;
        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() {
        this._previouslyFocusedElement = this._document.activeElement;
        this.focusTrap.focusInitialElementWhenReady();
    }
}
FocusTrapDirective.decorators = [
    { type: Directive, args: [{
                selector: '[focusTrap]',
                exportAs: 'focusTrap'
            },] }
];
FocusTrapDirective.ctorParameters = () => [
    { type: ElementRef },
    { type: FocusTrapFactory },
    { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }
];
FocusTrapDirective.propDecorators = {
    enabled: [{ type: Input, args: ['cdkTrapFocus',] }],
    autoCapture: [{ type: Input, args: ['cdkTrapFocusAutoCapture',] }]
};

class FocusTrapModule {
    static forRoot() {
        return {
            ngModule: FocusTrapModule,
            providers: [
                FocusTrapManager,
                Platform,
                InteractivityChecker
            ]
        };
    }
}
FocusTrapModule.decorators = [
    { type: NgModule, args: [{
                imports: [CommonModule],
                declarations: [FocusTrapDirective],
                exports: [FocusTrapDirective]
            },] }
];

/**
 * Generated bundle index. Do not edit.
 */

export { FocusTrap, FocusTrapDirective, FocusTrapModule, FocusTrapFactory as ɵa, InteractivityChecker as ɵb, Platform as ɵc, FocusTrapManager as ɵd };
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