import { OnInit, AfterViewInit } from '@angular/core';
import { PoTreeViewBaseComponent } from './po-tree-view-base.component';
/**
 * @docsExtends PoTreeViewBaseComponent
 *
 * @example
 *
 * <example name="po-tree-view-basic" title="PO Tree View Basic">
 *  <file name="sample-po-tree-view-basic/sample-po-tree-view-basic.component.html"> </file>
 *  <file name="sample-po-tree-view-basic/sample-po-tree-view-basic.component.ts"> </file>
 * </example>
 *
 * <example name="po-tree-view-labs" title="PO Tree View Labs">
 *  <file name="sample-po-tree-view-labs/sample-po-tree-view-labs.component.html"> </file>
 *  <file name="sample-po-tree-view-labs/sample-po-tree-view-labs.component.ts"> </file>
 * </example>
 *
 * <example name="po-tree-view-folder-structure" title="PO Tree View - Folder Structure">
 *  <file name="sample-po-tree-view-folder-structure/sample-po-tree-view-folder-structure.component.html"> </file>
 *  <file name="sample-po-tree-view-folder-structure/sample-po-tree-view-folder-structure.component.ts"> </file>
 * </example>
 *
 * <example name="po-tree-view-supermarket" title="PO Tree View - Supermarket">
 *  <file name="sample-po-tree-view-supermarket/sample-po-tree-view-supermarket.component.html"> </file>
 *  <file name="sample-po-tree-view-supermarket/sample-po-tree-view-supermarket.component.ts"> </file>
 * </example>
 */
export declare class PoTreeViewComponent extends PoTreeViewBaseComponent implements OnInit, AfterViewInit {
    private readonly elementRef;
    private readonly destroyRef;
    private readonly treeViewService;
    private readonly keyboardService;
    private readonly languageService;
    private readonly changeDetector;
    protected readonly literals: any;
    protected ariaLiveMessage: string;
    protected get hasItems(): boolean;
    constructor();
    ngOnInit(): void;
    ngAfterViewInit(): void;
    protected onTreeFocus(event: FocusEvent): void;
    protected onTreeKeydown(event: KeyboardEvent): void;
    protected trackByFunction(index: number): number;
    private announce;
}