import { AfterViewInit, ElementRef, EventEmitter, NgZone, OnDestroy, OnInit, Renderer2 } from '@angular/core';
export declare class KeyboardNavigationDirective implements OnInit, AfterViewInit, OnDestroy {
    private _render;
    private _elementRef;
    private _ngZone;
    currentIndex: number;
    closeOnTop: boolean;
    close: EventEmitter<any>;
    private _rootIndex;
    private _initialListener;
    constructor(_render: Renderer2, _elementRef: ElementRef, _ngZone: NgZone);
    ngOnInit(): void;
    ngAfterViewInit(): void;
    ngOnDestroy(): void;
    private targetIsInMenu(target);
    /**
     * Store the hovered item
     */
    private mouseMove(event);
    private keyDown(event);
    private mouseClick();
    /**
     * Focus an item in list or sub-list based on a direction
     */
    private focusItem(direction);
    /**
     * Add or remove the class 'active' from the parent of a sub-menu
     */
    private toggleActiveClass();
    /**
     * Return the list of button at the root level
     */
    private readonly rootList;
    /**
     * Return the list of button at the sub-menu level
     */
    private readonly childList;
    /**
     * Return a button at the root level
     */
    private rootLevelItem(i);
    /**
     * Return a button at the sub-menu level
     */
    private readonly childLevelItem;
    /**
     * Return the index of a element
     */
    private getElementIndex(node);
    /**
     * Trigger the click event of an item
     */
    private triggerClick();
    private reset();
}