import { OnDestroy, EventEmitter, ElementRef, SimpleChanges, OnChanges, AfterContentInit, QueryList } from '@angular/core';
import { CdkOverlayOrigin } from '@angular/cdk/overlay';
import { Subject, Observable } from 'rxjs';
import { DropDownService } from './dropdown.service';
export declare class DropDownDirective implements OnDestroy, OnChanges, AfterContentInit {
    private dropdownService;
    el: ElementRef;
    parentDropdown: DropDownDirective;
    dropdownChildren: QueryList<DropDownDirective>;
    private hoverSubscription;
    /**
     * 控制是否打开dropdown，绑定一个devui-dropdown-open class
     */
    isOpen: boolean;
    addClass: boolean;
    disabled: boolean;
    /**
     * dropdown触发方式
     */
    trigger: 'click' | 'hover';
    /**
     * 关闭区域，默认点击菜单链接也会关闭，blank点击其他空白区域才关闭
     */
    closeScope: 'all' | 'blank' | 'none';
    closeOnMouseLeaveMenu: boolean;
    toggleEvent: EventEmitter<boolean>;
    visibleSubject: Subject<boolean>;
    private _isOpen;
    menuEl: ElementRef;
    toggleEl: ElementRef;
    cdkConnectedOverlayOrigin: CdkOverlayOrigin;
    private _appendToBody;
    appendToBody: boolean;
    dropDownMenu: any;
    dropDownToggle: any;
    constructor(dropdownService: DropDownService, el: ElementRef, parentDropdown: DropDownDirective);
    ngOnChanges(changes: SimpleChanges): void;
    ngOnDestroy(): void;
    ngAfterContentInit(): void;
    toggle(): boolean;
    focusToggleElement(): void;
    updateCdkConnectedOverlayOrigin(): void;
    subscribeHoverAction(observable: Observable<boolean>): void;
    private unsubscribeHoverAction;
    handleHoverSubscriptionIfTriggerIsHover(): void;
    simulateEventDispatch($event: any, target?: any): void;
}