import Grid, { GridFunction, GridOptions, GridOutlines, Properties, PROPERTY_TYPE, RenderOptions } from "@egjs/grid";
import { GROUP_TYPE, STATUS_TYPE } from "./consts";
import { InfiniteGridItem, InfiniteGridItemStatus } from "./InfiniteGridItem";
import { InfiniteGridGroup, InfiniteGridItemInfo } from "./types";
export interface InfiniteGridGroupStatus {
    type: GROUP_TYPE;
    groupKey: string | number;
    items: InfiniteGridItemStatus[];
    outlines: GridOutlines;
}
export interface GroupManagerOptions extends GridOptions {
    gridConstructor: GridFunction | null;
    gridOptions: Record<string, any>;
}
export interface GroupManagerStatus {
    cursors: [number, number];
    orgCursors: [number, number];
    itemCursors: [number, number];
    startGroupKey: number | string;
    endGroupKey: number | string;
    groups: InfiniteGridGroupStatus[];
    outlines: GridOutlines;
}
export declare class GroupManager extends Grid<GroupManagerOptions> {
    static defaultOptions: Required<GroupManagerOptions>;
    static propertyTypes: {
        readonly gridConstructor: PROPERTY_TYPE.PROPERTY;
        readonly gridOptions: PROPERTY_TYPE.PROPERTY;
        readonly gap: PROPERTY_TYPE;
        readonly defaultDirection: PROPERTY_TYPE;
        readonly renderOnPropertyChange: PROPERTY_TYPE;
        readonly preserveUIOnDestroy: PROPERTY_TYPE;
        readonly useFit: PROPERTY_TYPE;
    };
    protected items: InfiniteGridItem[];
    protected groupItems: InfiniteGridItem[];
    protected groups: InfiniteGridGroup[];
    protected itemKeys: Record<string | number, InfiniteGridItem>;
    protected groupKeys: Record<string | number, InfiniteGridGroup>;
    protected startCursor: number;
    protected endCursor: number;
    private _placeholder;
    private _loadingGrid;
    constructor(container: HTMLElement, options: GroupManagerOptions);
    set gridOptions(options: Record<string, any>);
    getItemByKey(key: string | number): InfiniteGridItem | null;
    getGroupItems(includePlaceholders?: boolean): InfiniteGridItem[];
    getVisibleItems(includePlaceholders?: boolean): InfiniteGridItem[];
    getRenderingItems(): InfiniteGridItem[];
    getGroups(includePlaceholders?: boolean): InfiniteGridGroup[];
    hasVisibleVirtualGroups(): boolean;
    hasPlaceholder(): boolean;
    hasLoadingItem(): boolean;
    setPlaceholder(placeholder: Partial<InfiniteGridItemStatus> | null): void;
    getLoadingType(): "" | "end" | "start";
    startLoading(type: "start" | "end"): boolean;
    endLoading(): boolean;
    setLoading(loading: Partial<InfiniteGridItemStatus> | null): void;
    getVisibleGroups(includePlaceholders?: boolean): InfiniteGridGroup[];
    applyGrid(items: InfiniteGridItem[], direction: "end" | "start", outline: number[]): GridOutlines;
    syncItems(nextItemInfos: InfiniteGridItemInfo[]): void;
    renderItems(options?: RenderOptions): this;
    setCursors(startCursor: number, endCursor: number): void;
    getStartCursor(): number;
    getEndCursor(): number;
    getGroupStatus(type?: STATUS_TYPE): GroupManagerStatus;
    setGroupStatus(status: GroupManagerStatus): void;
    appendPlaceholders(items: number | InfiniteGridItemStatus[], groupKey?: string | number): {
        group: {
            type: GROUP_TYPE;
            groupKey: string | number;
            grid: Grid<GridOptions>;
            items: InfiniteGridItem[];
            renderItems: InfiniteGridItem[];
        };
        items: InfiniteGridItem[];
    };
    prependPlaceholders(items: number | InfiniteGridItemStatus[], groupKey?: string | number): {
        group: {
            type: GROUP_TYPE;
            groupKey: string | number;
            grid: Grid<GridOptions>;
            items: InfiniteGridItem[];
            renderItems: InfiniteGridItem[];
        };
        items: InfiniteGridItem[];
    };
    removePlaceholders(type: "start" | "end" | {
        groupKey: string | number;
    }): void;
    insertPlaceholders(direction: "start" | "end", items: number | InfiniteGridItemStatus[], groupKey?: string | number): {
        group: {
            type: GROUP_TYPE;
            groupKey: string | number;
            grid: Grid<GridOptions>;
            items: InfiniteGridItem[];
            renderItems: InfiniteGridItem[];
        };
        items: InfiniteGridItem[];
    };
    shouldRerenderItems(): boolean;
    private _getGroupItems;
    private _getRenderingItems;
    private _checkShouldRender;
    private _applyVirtualGrid;
    private _syncItemInfos;
    private _registerGroups;
    private _splitVirtualGroups;
    private _mergeVirtualGroups;
    private _updatePlaceholder;
    private _makeGrid;
    private _getLoadingGroup;
    private _getLoadingItem;
}
export interface GroupManager extends Properties<typeof GroupManager> {
    getItems(): InfiniteGridItem[];
}