/**
 * @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 { Directionality } from '@angular/cdk/bidi';
import { ElementRef, InjectionToken, NgZone } from '@angular/core';
import { ScrollDispatcher } from './scroll-dispatcher';
import { CdkScrollable } from './scrollable';
import * as i0 from "@angular/core";
export declare const VIRTUAL_SCROLLABLE: InjectionToken<CdkVirtualScrollable>;
/**
 * Extending the {@link CdkScrollable} to be used as scrolling container for virtual scrolling.
 */
export declare abstract class CdkVirtualScrollable extends CdkScrollable {
    constructor(elementRef: ElementRef<HTMLElement>, scrollDispatcher: ScrollDispatcher, ngZone: NgZone, dir?: Directionality);
    /**
     * Measure the viewport size for the provided orientation.
     *
     * @param orientation The orientation to measure the size from.
     */
    measureViewportSize(orientation: 'horizontal' | 'vertical'): number;
    /**
     * Measure the bounding ClientRect size including the scroll offset.
     *
     * @param from The edge to measure from.
     */
    abstract measureBoundingClientRectWithScrollOffset(from: 'left' | 'top' | 'right' | 'bottom'): number;
    static ɵfac: i0.ɵɵFactoryDeclaration<CdkVirtualScrollable, [null, null, null, { optional: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<CdkVirtualScrollable, never, never, {}, {}, never, never, false, never>;
}