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樹列表的拖拽涉及三個NX的回調(diào)，需要在三個回調(diào)設(shè)置好規(guī)則之后才能進(jìn)行拖拽操作。

            tree_control0.SetOnDropHandler(new Tree.OnDropCallback(OnDropCallback));
            tree_control0.SetIsDragAllowedHandler(new Tree.IsDragAllowedCallback(IsDragAllowedCallback));
            tree_control0.SetIsDropAllowedHandler(new Tree.IsDropAllowedCallback(IsDropAllowedCallback));

1.設(shè)置節(jié)點(diǎn)是否允許拖拽，下方設(shè)置的為父節(jié)點(diǎn)禁止拖拽。

        internal Node.DragType IsDragAllowedCallback(Tree tree, Node node, int columnId)
        {
            //是否允許拖動回調(diào)
            if (node.ParentNode != null)
            {
                return Node.DragType.All;
            }
            return Node.DragType.None;
        }

2.設(shè)置是否執(zhí)行拖拽回調(diào)，執(zhí)行的方式，下方為目標(biāo)節(jié)點(diǎn)為父節(jié)點(diǎn)時，作為子節(jié)點(diǎn)放置到其中，如果有父節(jié)點(diǎn)，則放到該節(jié)點(diǎn)后面。

       /// <summary>
        /// 是否執(zhí)行拖拽回調(diào)
        /// </summary>
        /// <param name="tree"></param>
        /// <param name="node">拖拽的節(jié)點(diǎn)</param>
        /// <param name="columnId"></param>
        /// <param name="targetNode">或拽到的目標(biāo)節(jié)點(diǎn)</param>
        /// <param name="targetColumnId"></param>
        /// <returns></returns>
        public Node.DropType IsDropAllowedCallback(Tree tree, Node node, int columnId, Node targetNode, int targetColumnId)
        {
            //是否執(zhí)行拖拽回調(diào)
            //SessionEx.WriteInformationWindow($"{targetNode.GetColumnDisplayText(0)}__{targetColumnId}");

            var dropType = targetNode.ParentNode == null ? Node.DropType.On : Node.DropType.After;
            return dropType;
        }

3.拖拽回調(diào)，拖拽發(fā)生后執(zhí)行此處的內(nèi)容，需要手工新建與移除拖拽后目標(biāo)節(jié)點(diǎn)。

        internal bool OnDropCallback(Tree tree, Node[] nodes, int columnId, Node targetNode, int targetColumnId, Node.DropType dropType, int dropMenuItemId)
        {
            //拖動回調(diào)
            foreach (var node in nodes)
            {
                var nodeData = NodeDataManage.First(x => x.Node == node);
                Node newNode = tree.CreateNode(node.GetColumnDisplayText(0));

                if (dropType == Node.DropType.On)
                {
                    tree.InsertNode(newNode, targetNode, null, Tree.NodeInsertOption.Last);
                }
                else if (dropType == Node.DropType.After)
                {
                    var parent = targetNode.ParentNode;
                    tree.InsertNode(newNode, parent, targetNode, Tree.NodeInsertOption.First);
                }
                newNode.SetColumnDisplayText(1, node.GetColumnDisplayText(1));
                newNode.SetColumnDisplayText(2, node.GetColumnDisplayText(2));
                newNode.DisplayIcon = node.DisplayIcon;
                newNode.SelectedIcon = node.SelectedIcon;
                tree.DeleteNode(node);
            }

            return true;
        }