import { DataSource } from '@angular/cdk/collections';
import { CdkVirtualScrollViewport } from '@angular/cdk/scrolling';
import { BehaviorSubject, Observable, Subscription } from 'rxjs';
import { EsTableRow } from "../model/es-table.interface";
interface TableVirtualDataSourceAttributes {
    preloadOffset?: number;
}
export declare class TableVirtualDataSource extends DataSource<any> {
    private viewport;
    private itemSize;
    private pageSize;
    private totalRows;
    private initialOffset;
    private onPageChange?;
    private onPageRequest?;
    private attributes?;
    private data;
    pageIndex: BehaviorSubject<number>;
    offset: number;
    preloadPage: BehaviorSubject<number>;
    scrollSubscription: Subscription;
    lastScrollTop: number;
    ready: BehaviorSubject<boolean>;
    constructor(initialData: EsTableRow[], viewport: CdkVirtualScrollViewport, itemSize: number, pageSize: number, totalRows: number, initialOffset: number, onPageChange?: (number: any) => any, onPageRequest?: (number: any) => any, attributes?: TableVirtualDataSourceAttributes);
    setData(data: EsTableRow[]): void;
    readonly visibleData: BehaviorSubject<any[]>;
    onScrolled(ev: Event): void;
    updateVisibleData(offset?: number): void;
    sliceData(start: number, end: number): any[];
    onDestroy(): void;
    connect(collectionViewer: import('@angular/cdk/collections').CollectionViewer): Observable<any[] | ReadonlyArray<any>>;
    disconnect(collectionViewer: import('@angular/cdk/collections').CollectionViewer): void;
}
export {};