import { ComponentRef, ElementRef, EmbeddedViewRef } from '@angular/core';
import { FocusTrapFactory } from '@angular/cdk/a11y';
import { BasePortalOutlet, ComponentPortal, CdkPortalOutlet, TemplatePortal } from '@angular/cdk/portal';
import { Subject } from 'rxjs';
import { MdcDialogConfig } from './dialog-config';
/**
 * Throws an exception for the case when a ComponentPortal is
 * attached to a DomPortalOutlet without an origin.
 */
export declare function throwMdcDialogContentAlreadyAttachedError(): void;
export declare class MdcDialogPortal extends BasePortalOutlet {
    private _elementRef;
    private _focusTrapFactory;
    private _document;
    _config: MdcDialogConfig;
    _portalOutlet: CdkPortalOutlet;
    /** The class that traps and manages focus within the dialog. */
    private _focusTrap;
    /** Element that was focused before the dialog was opened. Save this to restore upon close. */
    private _elementFocusedBeforeDialogWasOpened;
    /** A subject emitting after the dialog exits the view. */
    _afterExit: Subject<void>;
    /** ID for the container DOM element. */
    _id: string;
    /**
     * Attach a ComponentPortal as content to this dialog container.
     * @param portal Portal to be attached as the dialog content.
     */
    attachComponentPortal<T>(portal: ComponentPortal<T>): ComponentRef<T>;
    /**
     * Attach a TemplatePortal as content to this dialog container.
     * @param portal Portal to be attached as the dialog content.
     */
    attachTemplatePortal<C>(portal: TemplatePortal<C>): EmbeddedViewRef<C>;
    constructor(_elementRef: ElementRef, _focusTrapFactory: FocusTrapFactory, _document: any, _config: MdcDialogConfig);
    /** Moves the focus inside the focus trap. */
    trapFocus(): void;
    /** Restores focus to the element that was focused before the dialog opened. */
    restoreFocus(): void;
    /** Saves a reference to the element that was focused before the dialog was opened. */
    private _savePreviouslyFocusedElement;
}