import { FocusOrigin } from '@angular/cdk/a11y';
import { BooleanInput } from '@angular/cdk/coercion';
import { ElementRef, EventEmitter, OnDestroy, OnInit, QueryList } from '@angular/core';
import { Observable } from 'rxjs';
import { MenuComponent } from '../menu/menu.component';
import * as i0 from "@angular/core";
export declare class MenuTriggerDirective implements OnInit, OnDestroy {
    private readonly _overlay;
    private readonly _elementRef;
    private readonly _viewContainerRef;
    private readonly _focusOrigin;
    private readonly _focusIndicatorService;
    private readonly _overlayPlacement;
    private readonly _parentMenu;
    private readonly _menuItem;
    /** Access the menu we should show */
    menu: MenuComponent;
    /** Determine if we should disable the trigger */
    disabled: boolean;
    /** Optionally specify the menu's parent element */
    parent: ElementRef;
    /** Determine if the menu should close when it loses focus */
    set closeOnBlur(value: boolean);
    get closeOnBlur(): boolean;
    /** Emit when the menu is closed */
    readonly closed: EventEmitter<void>;
    /** Reference to the portal based off the MenuCompont templateRef */
    private _portal;
    /** Store the reference to the overlay */
    private _overlayRef?;
    /** Get the aria controls for accessibility */
    get ariaControls(): string | null;
    /** Store the instance of the focus indicator */
    private _focusIndicator;
    /** Automatically unsubscribe on directive destroy */
    private readonly _onDestroy$;
    /** Reference to the menu should close when it loses focus */
    private _closeOnBlur;
    /** Determine if this triggers a submenu */
    private get _isSubmenuTrigger();
    /** Determine if this is the root trigger */
    private get _isRootTrigger();
    private readonly _debounceTime;
    menuTriggers: QueryList<MenuTriggerDirective>;
    /** If this is a submenu we want to know when the mouse leaves the items or parent item */
    private get _menuShouldClose();
    ngOnInit(): void;
    ngOnDestroy(): void;
    /** Focus the next focusable element */
    focusNextElement(): void;
    /** Open the menu */
    openMenu(): void;
    /** Close a menu or submenu */
    closeMenu(origin?: FocusOrigin, closeParents?: boolean, focusTrigger?: boolean, focusNextElement?: boolean): Observable<void>;
    /** Toggle the open state of a menu */
    toggleMenu(event?: MouseEvent | KeyboardEvent): void;
    /** Submenus should be opened by hovering on the menu item */
    _onMouseEnter(): void;
    _onMouseMove(): void;
    /** Pressing the escape key should close all menus */
    _onEscape(): void;
    /** Handle keyboard events for opening submenus */
    _onKeydown(event: KeyboardEvent): void;
    /** Blurring the trigger should check if the menu has focus and close it if not */
    _onBlur(): void;
    /** Remove the menu from the DOM */
    private destroyMenu;
    /** Create an overlay or return an existing instance */
    private getOverlay;
    /** Create a Template portal if one does not already exist (or the template has changed) */
    private getPortal;
    /** Get an observable that emits on any of the triggers that close a menu */
    private didMenuClose;
    /** When the menu opens we want to focus the first item in the list */
    private menuDidOpen;
    /** Handle keypresses in submenus where we may want to close them */
    private onMenuKeydown;
    /** Check whether the overlay has focus */
    private hasFocus;
    /** Close the menu if there is no element focused */
    private closeOnFocusout;
    private getSubMenuPlacement;
    static ngAcceptInputType_closeOnBlur: BooleanInput;
    static ɵfac: i0.ɵɵFactoryDeclaration<MenuTriggerDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<MenuTriggerDirective, "[uxMenuTriggerFor]", ["ux-menu-trigger"], { "menu": { "alias": "uxMenuTriggerFor"; "required": false; }; "disabled": { "alias": "disabled"; "required": false; }; "parent": { "alias": "uxMenuParent"; "required": false; }; "closeOnBlur": { "alias": "closeOnBlur"; "required": false; }; }, { "closed": "closed"; }, ["menuTriggers"], never, false, never>;
}