import { ElementRef, EventEmitter, OnDestroy, Renderer2 } from '@angular/core';
import { DragAndDropEvent, TreeNode } from '../models';
import { TreeDraggingTargetService } from '../services/tree-dragging-target.service';
export declare type AllowDropPredicate = (element: TreeNode | null | undefined, $event: MouseEvent) => boolean;
export declare class TreeDropDirective implements OnDestroy {
    private el;
    private renderer;
    private treeDraggedElement;
    onDrop$: EventEmitter<DragAndDropEvent>;
    onDragOver$: EventEmitter<DragAndDropEvent>;
    onDragLeave$: EventEmitter<DragAndDropEvent>;
    onDragEnter$: EventEmitter<DragAndDropEvent>;
    set treeAllowDrop(allowDrop: boolean | AllowDropPredicate);
    get treeAllowDrop(): boolean | AllowDropPredicate;
    private dragOverClassAdded;
    private disabledClassAdded;
    constructor(el: ElementRef, renderer: Renderer2, treeDraggedElement: TreeDraggingTargetService);
    ngOnDestroy(): void;
    onDragOver($event: DragEvent): void;
    onDragEnter($event: DragEvent): void;
    onDragLeave($event: DragEvent): void;
    onDrop($event: DragEvent): void;
    allowDrop($event: MouseEvent): boolean;
    private _stopEvent;
    private _allowDrop;
    private addClass;
    private removeClass;
    private addDisabledClass;
    private removeDisabledClass;
}