import { ElementRef, NgZone, OnDestroy, Renderer2 } from '@angular/core';
import { KitEventManagerService } from '../kit-event-manager/kit-event-manager.service';
import { KitFocusManagerRegistryService } from './kit-focus-manager-registry.service';
import { KitFocusDirective } from './kit-focus/kit-focus.directive';
/**
 * ### Usage
 *
 * Provide `KitFocusManagerService` on component.
 *
 * #### Focus element
 *
 * Add directive and set id to an element.
 *
 * ```html
 * <input kitFocus="start">
 * ```
 *
 * Focus element by `id`
 *
 * ```typescript
 * this.focusManager.focusItem('start');
 * ```
 *
 * #### Focus trap
 *
 * Great tool for improve accessibility of components. Keep focus inside component that provide
 * `KitFocusManagerService`.
 *
 * Inject and init service with `autoCapture`.
 *
 * ```typescript
 * providers: [KitFocusManagerService],
 * ...
 * constructor(private focusManager: KitFocusManagerService) {
 *   this.focusManager.autoCapture = true;
 *   this.focusManager.init();
 * }
 * ```
 *
 *
 * ### Example
 *
 * * collection:date-picker -
 * [sources](https://github.com/ngx-kit/ngx-kit/tree/master/packages/collection/lib/ui-date-picker),
 * [demo](https://ngx-kit.com/collection/module/ui-date-picker)
 */
export declare class KitFocusManagerService implements OnDestroy {
    private el;
    private zone;
    private renderer;
    private em;
    private registry;
    /**
     * Automatically capture focus after creating.
     */
    autoCapture: boolean;
    onHold: boolean;
    private current;
    private focusTrap;
    private items;
    private outsideSource;
    private unsubs;
    constructor(el: ElementRef, zone: NgZone, renderer: Renderer2, em: KitEventManagerService, registry: KitFocusManagerRegistryService);
    private readonly documentActiveElement;
    ngOnDestroy(): void;
    /**
     * Activate focus-trap.
     */
    capture(): void;
    /**
     * Focus first focusable element.
     */
    focusFirst(): void;
    /**
     * Focus item dy id.
     */
    focusItem(id: string | number): void;
    /**
     * Focus last focusable element.
     */
    focusLast(): void;
    /**
     * Focus next focusable element (from current focused).
     */
    focusNext(): void;
    /**
     * Focus prev focusable element (from currect focused).
     */
    focusPrev(): void;
    /**
     * Required method for start service.
     */
    init(): void;
    /**
     * Register item for manual focus.
     */
    add(item: KitFocusDirective): void;
    /**
     * Disable focus-trap.
     */
    release(): void;
    /**
     * Remove item.
     */
    remove(item: KitFocusDirective): void;
    private focusinHandler;
    private focusoutHandler;
    private getTabbable;
    private isDescendant;
    private keydownHandler;
}