import { AnimationEvent } from '@angular/animations';
import { FocusKeyManager, FocusOrigin } from '@angular/cdk/a11y';
import { CdkPortal, CdkPortalOutlet } from '@angular/cdk/portal';
import { AfterContentInit, ElementRef, EventEmitter, OnDestroy, QueryList } from '@angular/core';
import { TypeRef } from '@sbb-esta/angular-core/common-behaviors';
import { SbbHeaderMenuItem } from '../header-menu-item/header-menu-item.directive';
import type { SbbHeader } from '../header/header.component';
export declare class SbbHeaderMenu implements AfterContentInit, OnDestroy {
    private _elementRef;
    _header: TypeRef<SbbHeader>;
    /** Unique ID to be used by menu trigger's "aria-owns" property. */
    id: string;
    /** Event emitted when the menu is closed. */
    readonly closed: EventEmitter<void | 'click' | 'keydown' | 'tab'>;
    /** Reference to the menu items. */
    _items: QueryList<SbbHeaderMenuItem>;
    /** @docs-private */
    _panelPortal: CdkPortal;
    /** @docs-private */
    _panelPortalOutlet: CdkPortalOutlet;
    /** Whether the menu panel is open. */
    get open(): boolean;
    set open(value: boolean);
    private _open;
    /**
     * This method takes classes set on the host sbb-header-menu element and applies them on the
     * menu template that displays in the overlay container.  Otherwise, it's difficult
     * to style the containing menu from outside the component.
     * @param classes list of class names
     */
    set panelClass(classes: string);
    private _previousPanelClass;
    /** Whether the autocomplete panel should be visible, depending on option length. */
    showPanel: boolean;
    /** Manages active item in item list based on key events. */
    _keyManager: FocusKeyManager<SbbHeaderMenuItem>;
    /** Class list for the panel. */
    _classList: {
        [key: string]: boolean;
    };
    /** @docs-private */
    _panel: CdkPortal | null;
    /** @docs-private */
    _animationState: 'closed' | 'open-panel' | 'open-menu';
    /** Subscription to tab events on the menu panel */
    private _tabSubscription;
    private _destroyed;
    constructor(_elementRef: ElementRef<HTMLElement>, _header: TypeRef<SbbHeader>);
    ngAfterContentInit(): void;
    ngOnDestroy(): void;
    /**
     * Focus the first item in the menu.
     * @param origin Action from which the focus originated. Used to set the correct styling.
     */
    focusFirstItem(origin?: FocusOrigin): void;
    /**
     * Resets the active item in the menu. This is used when the menu is opened, allowing
     * the user to start from the first option when pressing the down arrow.
     */
    resetActiveItem(): void;
    _onAnimationDone(event: AnimationEvent): void;
    _handleMenuKeydown(event: TypeRef<KeyboardEvent>): void;
    /** Handle a keyboard event from the menu, delegating to the appropriate action. */
    _handlePanelKeydown(event: KeyboardEvent): void;
}