import { IgxOverlayService } from '../overlay';
import { ScrollStrategy } from './scroll-strategy';
/**
 * Uses a tolerance and closes the shown component upon scrolling if the tolerance is exceeded
 */
export declare class CloseScrollStrategy extends ScrollStrategy {
    private _document;
    private _overlayService;
    private _id;
    private initialScrollTop;
    private initialScrollLeft;
    private _threshold;
    private _initialized;
    private _sourceElement;
    private _scrollContainer;
    private _overlayInfo;
    constructor(scrollContainer?: HTMLElement);
    /**
     * Initializes the strategy. Should be called once
     *
     * @param document reference to Document object.
     * @param overlayService IgxOverlay service to use in this strategy.
     * @param id Unique id for this strategy.
     * ```typescript
     * settings.scrollStrategy.initialize(document, overlay, id);
     * ```
     */
    initialize(document: Document, overlayService: IgxOverlayService, id: string): void;
    /**
     * Attaches the strategy
     * ```typescript
     * settings.scrollStrategy.attach();
     * ```
     */
    attach(): void;
    /**
     * Detaches the strategy
     * ```typescript
     * settings.scrollStrategy.detach();
     * ```
     */
    detach(): void;
    private onScroll;
}