import { Ctx } from '../../../internal-types';
export declare function useVirtualScroll(ctx: Ctx): {
    state: {
        selected: null | "horizontal" | "vertical";
    };
    onScrollLeftStart: (event: MouseEvent) => void;
    onScrollTopStart: (event: MouseEvent) => void;
    getWidthRatio: () => number;
    getHeightRatio: () => number;
};