import { TableRowData, VirtualScrollItem, LoadMoreConfig } from '../types';
import { MaybeRefOrGetter, Ref, ComputedRef } from 'vue';
import { DebouncedFunc } from 'lodash-es';

export interface UseVirtualScrollOptions {
    /** 容器高度 */
    containerHeight: number;
    /** 数据列表 */
    dataSource: TableRowData[];
    /** 预估行高 */
    estimatedRowHeight: number;
    /** 缓冲区大小 */
    bench?: number;
    /** 是否正在加载 */
    loading?: boolean;
    /** 是否还有更多数据 */
    hasMore?: boolean;
    /** LoadMore组件的预估高度 */
    loadMoreHeight?: number;
    /** 加载更多回调 */
    onLoadMore?: () => void;
    loadMoreConfig?: LoadMoreConfig;
}
export declare const useVirtualScroll: (options: MaybeRefOrGetter<UseVirtualScrollOptions>) => {
    containerRef: Ref<HTMLElement | undefined, HTMLElement | undefined>;
    setContainerRef: (el: HTMLElement | undefined) => void;
    scrollTop: Ref<number, number>;
    totalHeight: ComputedRef<number>;
    visibleItems: ComputedRef<VirtualScrollItem[]>;
    offsetY: ComputedRef<number>;
    remainingHeight: ComputedRef<number>;
    visibleRange: ComputedRef<{
        start: number;
        end: number;
        showLoadMore: boolean | undefined;
    }>;
    shouldShowLoadMore: ComputedRef<boolean | undefined>;
    handleScroll: (event: Event) => void;
    updateItemHeight: (index: number, height: number) => void;
    scrollToItem: (index: number) => void;
    setScrollTop: (top: number) => void;
    clearCache: (resetScroll?: boolean) => void;
    checkAndTriggerLoadMore: DebouncedFunc<(target: HTMLElement) => void>;
};