import { IStoreState } from '../../index.data';
export declare class VScrollBarHelper {
    barOffset: number;
    barSize: number;
    private _allVisibleRowHeight;
    private state;
    constructor(state: IStoreState);
    getBarOffset(): number;
    getBarSize(): number;
    getThumbOffset(): number;
    getThumbSize(): number;
}
export declare function get_allVisibleRowHeight_exceptFrozen(state: IStoreState): number;
/**
 * 找到某个区域内的全部可加载行, 包括可见行和预加载行 及 冻结行
 * @param state
 * @param clipHeight 区域高度
 * @return [true, false, false...], true表示可见, 数组长度等于state.rows.length
 */
export declare function getAllLoadableRowFlags(state: IStoreState): boolean[];
export declare function _getAllLoadableRowFlags(state: IStoreState, loadingHeight: number, collapsedFlags: boolean[], scrollY: number): boolean[];