import { ElementRef } from '@angular/core';
import { Platform } from '@angular/cdk/platform';
import { Observable, Subject } from 'rxjs';
import { NgScrollbar } from '../ng-scrollbar';
import { EventTargetLike } from 'rxjs/internal-compatibility';
export declare abstract class ScrollbarRef {
    protected scrollbarRef: NgScrollbar;
    protected document: any;
    protected destroyed: Subject<void>;
    protected eventContext: EventTargetLike<ElementRef>;
    protected readonly viewElement: HTMLElement;
    protected readonly trackElement: HTMLElement;
    protected readonly thumbElement: HTMLElement;
    protected readonly hoveredState: Subject<boolean>;
    protected readonly draggingState: Subject<boolean>;
    protected readonly pointerEvents: Subject<boolean>;
    protected abstract readonly scrollSize: number;
    protected abstract readonly viewportSize: number;
    protected abstract readonly trackSize: number;
    protected abstract readonly thumbSize: number;
    protected abstract readonly scrollOffset: number;
    protected abstract readonly dragStartOffset: number;
    protected abstract readonly dragOffset: number;
    protected abstract readonly pageProperty: string;
    protected abstract readonly clientProperty: string;
    protected readonly scrollMax: number;
    protected readonly trackMax: number;
    protected constructor(scrollbarRef: NgScrollbar, document: any, trackRef: ElementRef, thumbRef: ElementRef, platform: Platform, destroyed: Subject<void>, eventContext: EventTargetLike<ElementRef>);
    /**
     * Updates scrollbar's thumb position and size
     */
    protected updateThumb(): void;
    dragged(event: any): Observable<number>;
    /**
     * Stream that emits when a scrollbar is hovered
     */
    private hovered;
    /**
     * Stream that emits when scrollbar track is clicked
     */
    protected trackClicked(e: any): Observable<number>;
    /**
     * Stream that emits when view is scrolled
     */
    protected abstract scrolled(): Observable<any>;
    /**
     * Return a scrollTo option parameter
     */
    protected abstract mapToScrollToOption(value: number): ScrollToOptions;
    /**
     * Updates scrollbar's thumb size and position
     */
    protected abstract applyThumbStyle(size: number, position: number, trackMax?: number): void;
    /**
     * On drag function
     */
    protected abstract handleDragPosition(position: number, scrollMax: number): number;
    protected abstract scrollTo(point: number): void;
    protected abstract setDragging(value: boolean): void;
    protected abstract setHovered(value: boolean): void;
}