import { TreeNode } from '@farris/ui-treetable';
import { LookupGridComponent } from '../lookup-grid.component';
import { TreeInfo } from '../lookup-grid-options';
export declare class TreeNodeHelper {
    private instance;
    treeInfo: TreeInfo;
    flatAllNodes: any[];
    constructor(instance: LookupGridComponent);
    getTreeInfo(treeNode: TreeNode): any;
    getTreeNodeLayer(treeNode: TreeNode): any;
    /** 更新节点的展开状态。 根据组件中 expandLevel 的值决定
     * -1：不展开，0：全部展开，>0 展开到指定级数
     */
    updateTreeNodeExpanded(treeNodes: TreeNode[], treeInfo?: TreeInfo): void;
    private treeData2Flat;
    private shoudExpand;
    private isSelectNodeParent;
    getLeafNode(treeNode: TreeNode): any;
    flatTreeNodes(items: any, result?: any[]): any;
}