/**-----------------------------------------------------------------------------------------
* Copyright © 2025 Progress Software Corporation. All rights reserved.
* Licensed under commercial license. See LICENSE.md in the project root for more information
*-------------------------------------------------------------------------------------------*/
import { Observable } from 'rxjs';
import { TreeViewComponent } from '../treeview.component';
import { LoadMoreRequestArgs } from './load-more-request-args';
import * as i0 from "@angular/core";
/**
 * A directive that enables the display of only a limited amount of nodes per level
 * ([see example]({% slug loadmorebutton_treeview %})).
 */
export declare class LoadMoreDirective {
    private treeview;
    /**
     * Specifies the callback that will be called when the load more button is clicked.
     * Providing a function is only required when additional nodes are fetched on demand
     * ([see example]({% slug loadmorebutton_treeview %}#toc-remote-data)).
     */
    set loadMoreNodes(loadMoreNodes: ((loadMoreArgs: LoadMoreRequestArgs) => Observable<any[]>) | string);
    /**
     * Specifies the initial number of nodes that will be rendered on each level.
     * Every time the load more button is clicked, the data item page size will be incremented with this number.
     */
    pageSize: number;
    /**
     * Specifies the total number of root nodes.
     * Used when additional nodes are fetched on demand
     * ([see example]({% slug loadmorebutton_treeview %}#toc-remote-data)).
     */
    totalRootNodes: number;
    /**
     * Specifies which field holds information about the total number of child nodes of the data item.
     * Used when additional nodes are fetched on demand
     * ([see example]({% slug loadmorebutton_treeview %}#toc-remote-data)).
     */
    totalField: string;
    /**
     * Keeps track of the current page size of each node over expand/collapse cycles.
     */
    private pageSizes;
    /**
     * Used as an identifier for the root page size as the root collection of nodes is not associated with a data item.
     */
    private rootLevelId;
    constructor(treeview: TreeViewComponent);
    ngOnChanges(): void;
    private verifySettings;
    private getGroupSize;
    private setGroupSize;
    private getTotalNodesCount;
    private getInitalPageSize;
    static ɵfac: i0.ɵɵFactoryDeclaration<LoadMoreDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<LoadMoreDirective, "[kendoTreeViewLoadMore]", never, { "loadMoreNodes": { "alias": "kendoTreeViewLoadMore"; "required": false; }; "pageSize": { "alias": "pageSize"; "required": false; }; "totalRootNodes": { "alias": "totalRootNodes"; "required": false; }; "totalField": { "alias": "totalField"; "required": false; }; }, {}, never, never, true, never>;
}