| /** |
| * @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 { ContentObserver } from '@angular/cdk/observers'; |
| import { ElementRef, NgZone, OnDestroy, Provider } from '@angular/core'; |
| import { AriaLivePoliteness, LiveAnnouncerDefaultOptions } from './live-announcer-tokens'; |
| export declare class LiveAnnouncer implements OnDestroy { |
| private _ngZone; |
| private _defaultOptions?; |
| private _liveElement; |
| private _document; |
| private _previousTimeout?; |
| constructor(elementToken: any, _ngZone: NgZone, _document: any, _defaultOptions?: LiveAnnouncerDefaultOptions | undefined); |
| /** |
| * Announces a message to screenreaders. |
| * @param message Message to be announced to the screenreader. |
| * @returns Promise that will be resolved when the message is added to the DOM. |
| */ |
| announce(message: string): Promise<void>; |
| /** |
| * Announces a message to screenreaders. |
| * @param message Message to be announced to the screenreader. |
| * @param politeness The politeness of the announcer element. |
| * @returns Promise that will be resolved when the message is added to the DOM. |
| */ |
| announce(message: string, politeness?: AriaLivePoliteness): Promise<void>; |
| /** |
| * Announces a message to screenreaders. |
| * @param message Message to be announced to the screenreader. |
| * @param duration Time in milliseconds after which to clear out the announcer element. Note |
| * that this takes effect after the message has been added to the DOM, which can be up to |
| * 100ms after `announce` has been called. |
| * @returns Promise that will be resolved when the message is added to the DOM. |
| */ |
| announce(message: string, duration?: number): Promise<void>; |
| /** |
| * Announces a message to screenreaders. |
| * @param message Message to be announced to the screenreader. |
| * @param politeness The politeness of the announcer element. |
| * @param duration Time in milliseconds after which to clear out the announcer element. Note |
| * that this takes effect after the message has been added to the DOM, which can be up to |
| * 100ms after `announce` has been called. |
| * @returns Promise that will be resolved when the message is added to the DOM. |
| */ |
| announce(message: string, politeness?: AriaLivePoliteness, duration?: number): Promise<void>; |
| /** |
| * Clears the current text from the announcer element. Can be used to prevent |
| * screen readers from reading the text out again while the user is going |
| * through the page landmarks. |
| */ |
| clear(): void; |
| ngOnDestroy(): void; |
| private _createLiveElement; |
| } |
| /** |
| * A directive that works similarly to aria-live, but uses the LiveAnnouncer to ensure compatibility |
| * with a wider range of browsers and screen readers. |
| */ |
| export declare class CdkAriaLive implements OnDestroy { |
| private _elementRef; |
| private _liveAnnouncer; |
| private _contentObserver; |
| private _ngZone; |
| /** The aria-live politeness level to use when announcing messages. */ |
| politeness: AriaLivePoliteness; |
| private _politeness; |
| private _previousAnnouncedText?; |
| private _subscription; |
| constructor(_elementRef: ElementRef, _liveAnnouncer: LiveAnnouncer, _contentObserver: ContentObserver, _ngZone: NgZone); |
| ngOnDestroy(): void; |
| } |
| /** @docs-private @deprecated @breaking-change 8.0.0 */ |
| export declare function LIVE_ANNOUNCER_PROVIDER_FACTORY(parentAnnouncer: LiveAnnouncer, liveElement: any, _document: any, ngZone: NgZone): LiveAnnouncer; |
| /** @docs-private @deprecated @breaking-change 8.0.0 */ |
| export declare const LIVE_ANNOUNCER_PROVIDER: Provider; |