import { ElementRef } from "@angular/core";
import { Observable } from "rxjs";
import { OverlayPosition, OverlayStatus } from "./overlay.interface";
import { OverlayService } from "./overlay.service";
export declare class OverlayBase {
    protected overlayService: OverlayService;
    constructor(overlayService: OverlayService);
    private _$isPositionChange;
    private _$isOutviewPort;
    /**
  * Check if target is a children of element in input.
  *
  * @author Federico Gambardella<fedega86@libero.it>
  * @param {HTMLElmenet} element
  * @param {EventTarget} target
  */
    protected _isTargetNotElementChildren(element: HTMLElement, target: EventTarget): boolean;
    /**
      * Gets elementRef
      *
      * @author Federico Gamabrdella<federico.gamabrdella@micegroup.it>
      * @param {ElementRef} elRef
      * @param element
      */
    protected _getElementRef(elRef: ElementRef, element: any): ElementRef;
    /**
  * Sets overlayObj.
  *
  * @author Federico Gambardella<fedega86@libero.it>
  * @param {OverlayPosition} overlayObj
  */
    protected _setOverlayObj(overlayObj: OverlayPosition): OverlayPosition;
    listenToPositionChanged(): Observable<OverlayStatus>;
    notifyPositionChanged(value: OverlayStatus): void;
    listenToViewportBound(): Observable<string>;
    notifyOutViewPort(value: string): void;
}