/**
 * @license
 * Copyright Google Inc. 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 { ComponentFactoryResolver, ApplicationRef, Injector, NgZone, Provider } from '@angular/core';
import { OverlayState } from './overlay-state';
import { OverlayRef } from './overlay-ref';
import { OverlayPositionBuilder } from './position/overlay-position-builder';
import { OverlayContainer } from './overlay-container';
import { ScrollStrategyOptions } from './scroll/index';
/**
 * Service to create Overlays. Overlays are dynamically added pieces of floating UI, meant to be
 * used as a low-level building building block for other components. Dialogs, tooltips, menus,
 * selects, etc. can all be built using overlays. The service should primarily be used by authors
 * of re-usable components rather than developers building end-user applications.
 *
 * An overlay *is* a PortalHost, so any kind of Portal can be loaded into one.
 */
export declare class Overlay {
    scrollStrategies: ScrollStrategyOptions;
    private _overlayContainer;
    private _componentFactoryResolver;
    private _positionBuilder;
    private _appRef;
    private _injector;
    private _ngZone;
    constructor(scrollStrategies: ScrollStrategyOptions, _overlayContainer: OverlayContainer, _componentFactoryResolver: ComponentFactoryResolver, _positionBuilder: OverlayPositionBuilder, _appRef: ApplicationRef, _injector: Injector, _ngZone: NgZone);
    /**
     * Creates an overlay.
     * @param state State to apply to the overlay.
     * @returns Reference to the created overlay.
     */
    create(state?: OverlayState): OverlayRef;
    /**
     * Returns a position builder that can be used, via fluent API,
     * to construct and configure a position strategy.
     */
    position(): OverlayPositionBuilder;
    /**
     * Creates the DOM element for an overlay and appends it to the overlay container.
     * @returns Newly-created pane element
     */
    private _createPaneElement();
    /**
     * Create a DomPortalHost into which the overlay content can be loaded.
     * @param pane The DOM element to turn into a portal host.
     * @returns A portal host for the given DOM element.
     */
    private _createPortalHost(pane);
    /**
     * Creates an OverlayRef for an overlay in the given DOM element.
     * @param pane DOM element for the overlay
     * @param state
     */
    private _createOverlayRef(pane, state);
}
/** Providers for Overlay and its related injectables. */
export declare const OVERLAY_PROVIDERS: Provider[];