/// <reference types="jquery" />
import { ISurfaceContext } from '@devexpress/analytics-core/analytics-elements';
import { DragDropHandler, DragHelperContent, SurfaceSelection } from '@devexpress/analytics-core/analytics-internal';
import { UndoEngine } from '@devexpress/analytics-core/analytics-utils';
import { TreeListItemViewModel } from '@devexpress/analytics-core/analytics-widgets-internal';
import * as ko from 'knockout';
import { ObjectExplorerDragDropHelper } from './_objectExplorerDragDropHelper';
export declare class ObjectExplorerDragDropHandler extends DragDropHandler {
    private _canAddItems;
    protected undoEngine: ko.Observable<UndoEngine> | ko.Computed<UndoEngine>;
    protected _lastList: TreeListItemViewModel;
    protected _timeout: any;
    constructor(_canAddItems: ko.Computed<boolean>, surface: ko.Observable<ISurfaceContext> | ko.Computed<ISurfaceContext>, selection: SurfaceSelection, undoEngine: ko.Observable<UndoEngine> | ko.Computed<UndoEngine>, dragHelperContent: DragHelperContent);
    drag(event: MouseEvent | JQueryEventObject, ui: HTMLElement): void;
    reportControlsDragDropHelper: ObjectExplorerDragDropHelper;
}