import { EventEmitter, ElementRef, NgZone, Renderer2, OnInit, OnDestroy } from '@angular/core';
import { NgbDropdownConfig } from './dropdown-config';
import { PlacementArray, Placement } from '../util/positioning';
/**
 */
export declare class NgbDropdownMenu {
    dropdown: any;
    private _elementRef;
    private _renderer;
    placement: Placement;
    isOpen: boolean;
    constructor(dropdown: any, _elementRef: ElementRef, _renderer: Renderer2);
    isEventFrom($event: any): any;
    position(triggerEl: any, placement: any): void;
    applyPlacement(_placement: Placement): void;
}
/**
 * Marks an element to which dropdown menu will be anchored. This is a simple version
 * of the NgbDropdownToggle directive. It plays the same role as NgbDropdownToggle but
 * doesn't listen to click events to toggle dropdown menu thus enabling support for
 * events other than click.
 *
 * @since 1.1.0
 */
export declare class NgbDropdownAnchor {
    dropdown: any;
    private _elementRef;
    anchorEl: any;
    constructor(dropdown: any, _elementRef: ElementRef);
    isEventFrom($event: any): any;
}
/**
 * Allows the dropdown to be toggled via click. This directive is optional: you can use NgbDropdownAnchor as an
 * alternative.
 */
export declare class NgbDropdownToggle extends NgbDropdownAnchor {
    constructor(dropdown: any, elementRef: ElementRef);
    toggleOpen(): void;
}
/**
 * Transforms a node into a dropdown.
 */
export declare class NgbDropdown implements OnInit, OnDestroy {
    private _zoneSubscription;
    private _menu;
    private _anchor;
    /**
     * Indicates that dropdown should be closed when selecting one of dropdown items (click) or pressing ESC.
     * When it is true (default) dropdowns are automatically closed on both outside and inside (menu) clicks.
     * When it is false dropdowns are never automatically closed.
     * When it is 'outside' dropdowns are automatically closed on outside clicks but not on menu clicks.
     * When it is 'inside' dropdowns are automatically on menu clicks but not on outside clicks.
     */
    autoClose: boolean | 'outside' | 'inside';
    /**
     *  Defines whether or not the dropdown-menu is open initially.
     */
    _open: boolean;
    /**
     * Placement of a popover accepts:
     *    "top", "top-left", "top-right", "bottom", "bottom-left", "bottom-right",
     *    "left", "left-top", "left-bottom", "right", "right-top", "right-bottom"
     * and array of above values.
     */
    placement: PlacementArray;
    /**
     *  An event fired when the dropdown is opened or closed.
     *  Event's payload equals whether dropdown is open.
     */
    openChange: EventEmitter<{}>;
    constructor(config: NgbDropdownConfig, ngZone: NgZone);
    ngOnInit(): void;
    /**
     * Checks if the dropdown menu is open or not.
     */
    isOpen(): boolean;
    /**
     * Opens the dropdown menu of a given navbar or tabbed navigation.
     */
    open(): void;
    /**
     * Closes the dropdown menu of a given navbar or tabbed navigation.
     */
    close(): void;
    /**
     * Toggles the dropdown menu of a given navbar or tabbed navigation.
     */
    toggle(): void;
    closeFromClick($event: any): void;
    closeFromOutsideEsc(): void;
    ngOnDestroy(): void;
    private _isEventFromToggle($event);
    private _isEventFromMenu($event);
    private _positionMenu();
}