import { ElementRef } from "@angular/core";
import { BehaviorSubject, Observable } from "rxjs";
import * as i0 from "@angular/core";
export interface KeyboardHandlingOptions {
    menuElement: ElementRef | null;
    menuId: string;
    itemIndex?: number;
}
export interface DropdownState {
    activeMenuId: string;
}
export declare class DropdownService {
    private readonly initialState;
    state$: BehaviorSubject<DropdownState | null>;
    readonly activeMenuId$: Observable<string | undefined>;
    openMenu(menuId: string): void;
    closeAllMenus(): void;
    isMenuActive(menuId: string): Observable<boolean>;
    reset(): void;
    handleKeyboardInput(key: string, options: KeyboardHandlingOptions): void;
    handleKeyboardNavigation(key: string, options: KeyboardHandlingOptions): void;
    private focusNextElement;
    private focusPreviousElement;
    private getFocusableElements;
    static ɵfac: i0.ɵɵFactoryDeclaration<DropdownService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<DropdownService>;
}