import { ElementRef } from '@angular/core';
/**
 * @docsPrivate
 *
 * @description
 *
 * Serviço responsável pelo gerenciamento de foco e navegação por teclado do PoTreeView.
 */
export declare class PoTreeViewKeyboardService {
    private hostElement;
    private lastFocusedNode;
    setHostElement(element: ElementRef<HTMLElement>): void;
    setLastFocusedNode(node: HTMLElement): void;
    focusLastOrFirst(): void;
    private getVisibleNodes;
    private getFocusableNodes;
    focusFirst(): void;
    focusLast(): void;
    focusNext(currentNode: HTMLElement): void;
    focusPrevious(currentNode: HTMLElement): void;
    focusFirstChild(currentNode: HTMLElement): void;
    focusParent(currentNode: HTMLElement): void;
    hasParentNode(currentNode: HTMLElement): boolean;
    focusByCharacter(char: string, currentNode: HTMLElement): void;
    private isNodeFocusable;
    private focusNode;
}