/**
 * @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 { Platform } from 'cdk/platform';
import { NgZone, OnDestroy } from '@angular/core';
import { Observable } from 'rxjs';
/** Time in ms to throttle the resize events by default. */
import * as ɵngcc0 from '@angular/core';
export declare const DEFAULT_RESIZE_TIME = 20;
/** Object that holds the scroll position of the viewport in each direction. */
export interface ViewportScrollPosition {
	top: number;
	left: number;
}
/**
 * Simple utility for getting the bounds of the browser viewport.
 * @docs-private
 */
export declare class ViewportRuler implements OnDestroy {
	private _platform;
	/** Cached viewport dimensions. */
	private _viewportSize;
	/** Stream of viewport change events. */
	private readonly _change;
	/** Event listener that will be used to handle the viewport change events. */
	private _changeListener;
	/** Used to reference correct document/window */
	protected _document: Document;
	constructor(_platform: Platform, ngZone: NgZone, document: any);
	ngOnDestroy(): void;
	/** Returns the viewport's width and height. */
	getViewportSize(): Readonly<{
		width: number;
		height: number;
	}>;
	/** Gets a ClientRect for the viewport's bounds. */
	getViewportRect(): ClientRect;
	/** Gets the (top, left) scroll position of the viewport. */
	getViewportScrollPosition(): ViewportScrollPosition;
	/**
	 * Returns a stream that emits whenever the size of the viewport changes.
	 * This stream emits outside of the Angular zone.
	 * @param throttleTime Time in milliseconds to throttle the stream.
	 */
	change(throttleTime?: number): Observable<Event>;
	/** Use defaultView of injected document if available or fallback to global window reference */
	private _getWindow;
	/** Updates the cached viewport size. */
	private _updateViewportSize;
	static ɵfac: ɵngcc0.ɵɵFactoryDef<
		ViewportRuler,
		[null, null, { optional: true }]
	>;
}

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