import { NgxInfiniteScrollerDirective } from '../ngx-infinite-scroller.directive';
import { DirectiveStateService } from '../directive-state.service';
import { ScrollPosition } from '../model/scroll-position.model';
import { InitialScrollPosition } from '../enum/initial-scroll-position-type.enum';
export declare abstract class StrategyBase {
    protected directive: NgxInfiniteScrollerDirective;
    protected state: DirectiveStateService;
    constructor(directive: NgxInfiniteScrollerDirective, state: DirectiveStateService);
    protected wasScrolledDown(prevPos: ScrollPosition, currentPos: ScrollPosition): boolean;
    protected wasScrolledUp(prevPos: ScrollPosition, currentPos: ScrollPosition): boolean;
    protected isScrollDownEnough(pos: ScrollPosition, scrollPositionTrigger: number): boolean;
    protected isScrollUpEnough(pos: ScrollPosition, scrollPositionTrigger: number): boolean;
    protected getInitialScrollPositionValue(defaultScrollPosition: InitialScrollPosition): number;
    private getInitialScrollPositions;
}