/**-----------------------------------------------------------------------------------------
* Copyright © 2026 Progress Software Corporation. All rights reserved.
* Licensed under commercial license. See LICENSE.md in the project root for more information
*-------------------------------------------------------------------------------------------*/
import { EventEmitter, OnDestroy } from '@angular/core';
import { GridComponent } from '../grid.component';
import { GroupRowArgs } from '../grouping/group-rows-args.interface';
import * as i0 from "@angular/core";
/**
 * Controls the expanded state of group rows in the Grid.
 * Use this directive to manage which group rows are expanded or collapsed
 * ([see example](https://www.telerik.com/kendo-angular-ui/components/grid/grouping/expanded-state#built-in-directive)).
 *
 * @example
 * ```typescript
 * <kendo-grid [kendoGridExpandGroupBy]="expandGroupBy" [expandedGroupKeys]="expandedGroupKeys"></kendo-grid>
 * ```
 * @remarks
 * Applied to: {@link GridComponent}.
 */
export declare class ExpandGroupDirective implements OnDestroy {
    protected grid: GridComponent;
    /**
     * Fires when the `expandedGroupKeys` collection changes.
     */
    expandedGroupKeysChange: EventEmitter<any[]>;
    /**
     * Sets the item format stored in the `expandedGroupKeys` collection.
     * Accepts a property name or a function that returns a unique key for each group
     * ([see example](https://www.telerik.com/kendo-angular-ui/components/grid/grouping/expanded-state#custom-group-key-format)).
     */
    get expandGroupBy(): string | ((group: GroupRowArgs) => any);
    set expandGroupBy(key: string | ((group: GroupRowArgs) => any));
    /**
     * Holds the collection of expanded group keys.
     * Set this property to control which group rows are expanded.
     */
    get expandedGroupKeys(): any[];
    set expandedGroupKeys(expandedGroups: any[]);
    /**
     * Specifies if group items are expanded by default.
     * @default false
     */
    groupsInitiallyExpanded: boolean;
    private _expandGroupBy;
    private _expandedGroupKeys;
    private subscriptions;
    constructor(grid: GridComponent);
    ngOnDestroy(): void;
    protected get keyGetter(): any;
    /**
     * @hidden
     */
    isExpanded(groupArgs: GroupRowArgs): boolean;
    private getItemIndex;
    private toggleState;
    static ɵfac: i0.ɵɵFactoryDeclaration<ExpandGroupDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<ExpandGroupDirective, "[kendoGridExpandGroupBy]", ["kendoGridExpandGroupBy"], { "expandGroupBy": { "alias": "kendoGridExpandGroupBy"; "required": false; }; "expandedGroupKeys": { "alias": "expandedGroupKeys"; "required": false; }; "groupsInitiallyExpanded": { "alias": "groupsInitiallyExpanded"; "required": false; }; }, { "expandedGroupKeysChange": "expandedGroupKeysChange"; }, never, never, true, never>;
}