import { AnimationEvent } from '@angular/animations';
import { AriaLivePoliteness } from '@angular/cdk/a11y';
import { Platform } from '@angular/cdk/platform';
import { BasePortalOutlet, CdkPortalOutlet, ComponentPortal, DomPortal, TemplatePortal } from '@angular/cdk/portal';
import { ChangeDetectorRef, ComponentRef, ElementRef, EmbeddedViewRef, NgZone, OnDestroy } from '@angular/core';
import { Observable, Subject } from 'rxjs';
import { BaoSnackBarConfig } from './snack-bar-config';
import * as i0 from "@angular/core";
/**
 * Internal interface for a snack bar container.
 * @docs-private
 */
export interface IBaoSnackBarContainer {
    snackBarConfig: BaoSnackBarConfig;
    _onAnnounce: Subject<any>;
    _onExit: Subject<any>;
    _onEnter: Subject<any>;
    enter: () => void;
    exit: () => Observable<void>;
    attachTemplatePortal: <C>(portal: TemplatePortal<C>) => EmbeddedViewRef<C>;
    attachComponentPortal: <T>(portal: ComponentPortal<T>) => ComponentRef<T>;
}
/**
 * Internal component that wraps user-provided snack bar content.
 * @docs-private
 */
export declare class BaoSnackBarContainerComponent extends BasePortalOutlet implements OnDestroy, IBaoSnackBarContainer {
    private _ngZone;
    private _elementRef;
    private _changeDetectorRef;
    private _platform;
    /** The snack bar configuration. */
    snackBarConfig: BaoSnackBarConfig;
    /** The portal outlet inside of this container into which the snack bar content will be loaded. */
    _portalOutlet: CdkPortalOutlet;
    private _document;
    private _trackedModals;
    /** Subject for notifying that the snack bar has announced to screen readers. */
    readonly _onAnnounce: Subject<void>;
    /** Subject for notifying that the snack bar has exited from view. */
    readonly _onExit: Subject<void>;
    /** Subject for notifying that the snack bar has finished entering the view. */
    readonly _onEnter: Subject<void>;
    /** The state of the snack bar animations. */
    _animationState: string;
    /** aria-live value for the live region. */
    _live: AriaLivePoliteness;
    /** The number of milliseconds to wait before announcing the snack bar's content. */
    private readonly _announceDelay;
    /** The timeout for announcing the snack bar's content. */
    private _announceTimeoutId;
    /** Whether the component has been destroyed. */
    private _destroyed;
    /**
     * Role of the live region. This is only for Firefox as there is a known issue where Firefox +
     * JAWS does not read out aria-live message.
     */
    _role?: 'status' | 'alert';
    /** Unique ID of the aria-live element. */
    readonly _liveElementId: string;
    constructor(_ngZone: NgZone, _elementRef: ElementRef<HTMLElement>, _changeDetectorRef: ChangeDetectorRef, _platform: Platform, 
    /** The snack bar configuration. */
    snackBarConfig: BaoSnackBarConfig);
    /** Attach a component portal as content to this snack bar container. */
    attachComponentPortal<T>(portal: ComponentPortal<T>): ComponentRef<T>;
    /** Attach a template portal as content to this snack bar container. */
    attachTemplatePortal<C>(portal: TemplatePortal<C>): EmbeddedViewRef<C>;
    /**
     * Attaches a DOM portal to the snack bar container.
     * @deprecated To be turned into a method.
     * @breaking-change 10.0.0
     */
    attachDomPortal: (portal: DomPortal) => void;
    /** Handle end of animations, updating the state of the snackbar. */
    onAnimationEnd(event: AnimationEvent): void;
    /** Begin animation of snack bar entrance into view. */
    enter(): void;
    /** Begin animation of the snack bar exiting from view. */
    exit(): Observable<void>;
    /** Makes sure the exit callbacks have been invoked when the element is destroyed. */
    ngOnDestroy(): void;
    /**
     * Waits for the zone to settle before removing the element. Helps prevent
     * errors where we end up removing an element which is in the middle of an animation.
     */
    private completeExit;
    /** Applies the various positioning and user-configured CSS classes to the snack bar. */
    private applySnackBarClasses;
    /**
     * Called after the portal contents have been attached. Can be
     * used to modify the DOM once it's guaranteed to be in place.
     */
    protected _afterPortalAttached(): void;
    /**
     * Some browsers won't expose the accessibility node of the live element if there is an
     * `aria-modal` and the live element is outside of it. This method works around the issue by
     * pointing the `aria-owns` of all modals to the live element.
     */
    private _exposeToModals;
    /** Clears the references to the live element from any modals it was added to. */
    private _clearFromModals;
    /** Asserts that no content is already attached to the container. */
    private assertNotAttached;
    /**
     * Starts a timeout to move the snack bar content to the live region so screen readers will
     * announce it.
     */
    private screenReaderAnnounce;
    static ɵfac: i0.ɵɵFactoryDeclaration<BaoSnackBarContainerComponent, never>;
    static ɵcmp: i0.ɵɵComponentDeclaration<BaoSnackBarContainerComponent, "bao-snack-bar-container", never, {}, {}, never, never, false, never>;
}