Csharp: TreeList Drag and Drop

  /// <summary>
    /// https://www.codeproject.com/articles/3225/treelistview
    /// https://www.codeproject.com/tips/572728/treelistviewex-tree-list-and-drag-and-drop     
    /// https://sourceforge.net/projects/objectlistview/
    /// 涂聚文 20190704
    /// geovin du
    /// </summary>
    public partial class trytreelistview : form
    {
        list<int> selectindex = new list<int>();//
  
        treelistviewitem draggednode=new treelistviewitem();
        /// <summary>
        /// 
        /// </summary>
        public string draggtext
        {
            set;
            get;
        }
        /// <summary>
        /// 
        /// </summary>
        string beforeedit = "";
        /// <summary>
        /// 
        /// </summary>
        string beforeeditname = "";
        /// <summary>
        /// 
        /// </summary>
        string afteredit = "";
        string nodechildid = "";
        string nodeparentid = "";
        string nodechild = "";
        string nodeparent = "";
        string nodetitle = "";
        /// <summary>
        /// 
        /// </summary>
        list<treelistviewitem> getlist = new list<treelistviewitem>();
        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
       datatable setlist()
       {

            datatable dt = new datatable();
            dt.columns.add("id", typeof(int));
            dt.columns.add("name", typeof(string));
            dt.columns.add("parentid", typeof(int));
            dt.columns.add("level", typeof(int));
            dt.rows.add(1, "六福集团", 0,0);
            dt.rows.add(2, "广州六福", 1,1);
            dt.rows.add(3, "北京六福", 1,1);
            dt.rows.add(4, "上海六福", 1,1);
            dt.rows.add(5, "深圳六福", 1,1);
            dt.rows.add(6, "人事部", 5,2);
            dt.rows.add(7, "科技部", 5,2);
            dt.rows.add(8, "恒大集团", 0, 0);
            dt.rows.add(9, "恒大广州", 8, 1);
            dt.rows.add(10, "恒大北京", 8, 1);
            dt.rows.add(11, "恒大上海", 8, 1);
            dt.rows.add(12, "恒大深圳", 8, 1);
            dt.rows.add(13, "人事部", 11, 2);
            dt.rows.add(14, "科技部", 11, 2);


            return dt;
       }
       /// <summary>
       /// 
       /// </summary>
       /// <param name="tr1"></param>
       /// <param name="parentid"></param>
       private void settreeview(treeview tr1, int parentid)
       {

           datarow[] ds = setlist().select("parentid=" + parentid.tostring());
           if (ds.length > 0)
           {
               int pid = -1;
               foreach (datarow row in ds)
               {
                   treenode node = new treenode();
                   node.text = row["name"].tostring();
                   node.tag = (int)row["id"];
                   pid = (int)row["parentid"];
                   if (pid == 0)
                   {
                       //添加根节点
                       tr1.nodes.add(node);
                   }
                   else
                   {
                       //添加根节点之外的其他节点
                       refreshchildnode(tr1, node, pid);
                   }
                   //查找以node为父节点的子节点
                   settreeview(tr1, (int)node.tag);

               }
           }
                  
       }
        /// <summary>
        /// 
        /// </summary>
        public void bind()
       {

           columnheader head=new columnheader();
           head.text = "level";        
           treelistview1.columns.add(head);
           datarow[] ds = setlist().select("parentid=0");
           
           

           foreach (datarow row in ds)
           {

               //第一层
               treelistviewitem itema = new treelistviewitem(row["name"].tostring(), 0);
               itema.expand();
               itema.subitems.add(row["id"].tostring());
               itema.subitems.add(row["parentid"].tostring());
               itema.subitems.add(row["level"].tostring());
               itema.tooltiptext = row["parentid"].tostring();
               treelistview1.items.add(itema);
               datarow[] ds1 = setlist().select("parentid=" + row["id"].tostring());
               if (ds1.length > 0)
               {
                   //第二层
                   foreach (datarow row1 in ds1)
                   {
                       if (row["id"].tostring() == row1["parentid"].tostring())
                       {
                           treelistviewitem item = new treelistviewitem(row1["name"].tostring(), 1);
                           item.subitems.add(row1["id"].tostring());
                           item.subitems.add(row1["parentid"].tostring());
                           item.subitems.add(row1["level"].tostring());
                           item.tooltiptext = row1["parentid"].tostring();
                           itema.items.add(item);

                           datarow[] ds2 = setlist().select("parentid=" + row1["id"].tostring());
                           if (ds2.length > 0)
                           {
                               foreach (datarow row2 in ds2)
                               {
                                   //第三层
                                   if (row1["id"].tostring() == row2["parentid"].tostring())
                                   {
                                       treelistviewitem item2 = new treelistviewitem(row2["name"].tostring(), 2);
                                       item2.subitems.add(row2["id"].tostring());
                                       item2.subitems.add(row2["parentid"].tostring());
                                       item2.subitems.add(row2["level"].tostring());
                                       item2.tooltiptext = row2["parentid"].tostring();
                                       item.items.add(item2);
                                   }


                               }
                           }
                       }    
                   }
               }



           }

       }
       /// <summary>
       /// 处理根节点的子节点
       /// </summary>
       /// <param name="tr1"></param>
       /// <param name="treenode"></param>
       /// <param name="parentid"></param>
       private void refreshchildnode(treeview tr1, treenode treenode, int parentid)
       {
           foreach (treenode node in tr1.nodes)
           {
               if ((int)node.tag == parentid)
               {
                   node.nodes.add(treenode);
                   return;
               }
               else if (node.nodes.count > 0)
               {
                   findchildnode(node, treenode, parentid);
               }
           }
       }
       /// <summary>
       /// 处理根节点的子节点的子节点
       /// </summary>
       /// <param name="tnode"></param>
       /// <param name="treenode"></param>
       /// <param name="parentid"></param>
       private void findchildnode(treenode tnode, treenode treenode, int parentid)
       {

           foreach (treenode node in tnode.nodes)
           {
               if ((int)node.tag == parentid)
               {
                   node.nodes.add(treenode);
                   return;
               }
               else if (node.nodes.count > 0)
               {
                   findchildnode(node, treenode, parentid);

               }

           }

       }


        /// <summary>
        /// 
        /// </summary>
        public trytreelistview()
        {
            initializecomponent();
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void trytreelistview_load(object sender, eventargs e)
        {
            settreeview(this.treeview1, 0);
            this.treeview1.expandall();
            bind();
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_itemcheck(object sender, itemcheckeventargs e)
        {

            treelistviewitem item = new treelistviewitem();
            //messagebox.show(e.index.tostring());
            // treelistviewitem
            //messagebox.show(treelistview1.selecteditems.count.tostring());
            // messagebox.show(treelistview1.items[0].subitems[0].text);
            //messagebox.show(treelistview1.gettreelistviewitemfromindex(e.index).text);
            if (treelistview1.gettreelistviewitemfromindex(e.index).checked == false)
            {

                //messagebox.show(treelistview1.gettreelistviewitemfromindex(e.index).subitems[0].text);  //从子节点开始
                item = treelistview1.gettreelistviewitemfromindex(e.index);
                getlist.add(item);
            }

            //取消
            //if (treelistview1.gettreelistviewitemfromindex(e.index).checked == true)
            //{
            //    messagebox.show(treelistview1.gettreelistviewitemfromindex(e.index).subitems[0].text);
            //}

            //messagebox.show(e.index.tostring());
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_itemactivate(object sender, eventargs e)
        {
            
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_click(object sender, eventargs e)
        {
            this.textbox1.text=getlist.count.tostring();
            string s = getlist[0].fullpath; //节点路径
            string l=getlist[0].level.tostring();
            string ss = getlist[0].parent.text;
            string sb = getlist[0].parent.subitems[0].text;
            form1 frm = new form1();
            frm.fullpath = getlist[0].fullpath; //节点路径
            frm.editname = getlist[0].text;
            frm.id = getlist[0].subitems[1].text;
            if (frm.showdialog() == dialogresult.ok)
            {

            }
             getlist = new list<treelistviewitem>();

          

            
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_itemmousehover(object sender, listviewitemmousehovereventargs e)
        {
            //messagebox.show(e.item.text);
        }
        /// <summary>
        /// 编辑前的值
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_beforelabeledit(object sender, treelistviewbeforelabelediteventargs e)
        {
            messagebox.show(e.item.text);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_afterlabeledit(object sender, treelistviewlabelediteventargs e)
        {
            messagebox.show(e.item.text);
        }
        /// <summary>
        /// 拖放完成发生
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_dragdrop(object sender, drageventargs e)
        {
            try
            {

                // retrieve the client coordinates of the drop location.
                point targetpoint = treelistview1.pointtoclient(new point(e.x, e.y));
                //所要放置的位置
                // retrieve the node at the drop location.
                treelistviewitem targetnode = treelistview1.getitemat(targetpoint);
                treelistviewitem fullnode = treelistview1.getitematfullrow(targetpoint);
                // draggednode = (treelistviewitem)e.data.getdata(typeof(treelistviewitem));
                //string s = e.data.getdata(typeof(treelistviewitem)).tostring();
                system.windows.forms.treelistview.dragitemdata data = (system.windows.forms.treelistview.dragitemdata)e.data.getdata(typeof(system.windows.forms.treelistview.dragitemdata));
                draggednode = (treelistviewitem)data.dragitems[0];

                if (!draggednode.equals(targetnode) && !containsnode(draggednode, targetnode))
                {
                    // if it is a move operation, remove the node from its current 
                    // location and add it to the node at the drop location.
                    if (e.effect == dragdropeffects.move)
                    {


                        //draggednode.remove();
                        // int indx=targetnode.index;
                        // targetnode.items.insert(draggednode.index,draggednode);
                        //treelistview1.items.insert(indx, targetnode);

                        draggednode.remove();
                        targetnode.items.add(draggednode);

                        // targetnode.items.insert(indx, draggednode); //父节点，添加移动的子节点

                        nodechildid = draggednode.subitems[1].text;//子节点
                        nodeparentid = targetnode.subitems[1].text;//父节点
                        nodechild = draggednode.text;//子节点
                        nodeparent = targetnode.text;//父节点
                        nodetitle = draggednode.tooltiptext;

                        //bookkindlistinfo.bookkindid = int.parse(nodechildid);
                        //bookkindlistinfo.bookkindparent = int.parse(nodeparentid);
                        //bookkindlistinfo.bookkindname = nodechild;
                        //bookkindlistinfo.bookkindcode = nodetitle;
                        //this.textbox1.text = nodeparent;
                        //this.textbox2.text = nodechild;
                        //this.textbox3.text = nodetitle;
                        //formoperatingstringinfo.nodemoveupdated = true;

                        //button1.text = "移動區域節點";

                        //administrativearealistinfo.areaid = int.parse(nodechildid);                  
                        //administrativearealistinfo.areaparentid = int.parse(nodeparentid);
                        //administrativearealistinfo.areaname = nodechild;
                        //int k = bookkindlistbll.updatebookkindlist(bookkindlistinfo);
                        //if (k >= 1)
                        //{
                        //    messagebox.show("移動书目录成功！");
                        //    initdatatable();
                        //    bindroot();
                        //    treeview1.expandall(); //全部展开
                        //}
                        //else
                        //{
                        //    messagebox.show("移動书目录不成功！");
                        //}


                        /// messagebox.show("子节点：" + nodechild + ",父节点：" + nodeparent, "拖动节点", messageboxbuttons.ok, messageboxicon.information);
                    }

                    // if it is a copy operation, clone the dragged node 
                    // and add it to the node at the drop location.
                    else if (e.effect == dragdropeffects.copy)
                    {
                        targetnode.items.add((treelistviewitem)draggednode.clone());
                    }

                    // expand the node at the location 
                    // to show the dropped node.
                    targetnode.expand();
                }
            }
            catch (exception ex)
            {
                ex.message.tostring();
            }
        }

        /// <summary>
        ///determine whether one node is a parent 
        ///or ancestor of a second node.
        /// </summary>
        /// <param name="node1"></param>
        /// <param name="node2"></param>
        /// <returns></returns>
        private bool containsnode(treelistviewitem node1, treelistviewitem node2)
        {
            // check the parent node of the second node.
            if (node2.parent == null) return false;
            if (node2.parent.equals(node1)) return true;

            // if the parent node is not null or equal to the first node, 
            // call the containsnode method recursively using the parent of 
            // the second node.
            return containsnode(node1, node2.parent);
        }

        /// <summary>
        /// 施放离开边界时发生
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_dragleave(object sender, eventargs e)
        {
            
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_dragenter(object sender, drageventargs e)
        {
            e.effect = e.allowedeffect;
            
            
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_itemdrag(object sender, itemdrageventargs e)
        {
            // move the dragged node when the left mouse button is used.
            if (e.button == mousebuttons.left)
            {
                dodragdrop(e.item, dragdropeffects.move);
                draggednode = (treelistviewitem)e.item;

            }

            // copy the dragged node when the right mouse button is used.
            else if (e.button == mousebuttons.right)
            {
                dodragdrop(e.item, dragdropeffects.copy);
                draggednode = (treelistviewitem)e.item;
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_dragover(object sender, drageventargs e)
        {
            //draggednode = (treelistviewitem)e.data.getdata(typeof(treelistviewitem));

                //point draggedpoint = treelistview1.pointtoclient(new point(e.x, e.y));
                //draggednode = treelistview1.getitemat(draggedpoint);         


        }
        /// <summary>
        /// 双控件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_doubleclick(object sender, eventargs e)
        {
           string selectedname=treelistview1.selecteditems[0].text;
           form1 frm = new form1();
           frm.fullpath = treelistview1.selecteditems[0].fullpath; //节点路径
           frm.editname = treelistview1.selecteditems[0].text;
           frm.id = treelistview1.selecteditems[0].subitems[1].text;
           if (frm.showdialog() == dialogresult.ok)
           {

           }
           this.textbox1.text = selectedname;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treelistview1_leave(object sender, eventargs e)
        {
            if (treelistview1.selecteditems!= null)
            {
                //让选中项背景色呈现红色
                treelistview1.selecteditems[0].backcolor = color.red;
                //前景色为白色
                treelistview1.selecteditems[0].forecolor = color.white;
            }
        }
        /// <summary>
        /// 添加子节点
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void addtoolstripmenuitem_click(object sender, eventargs e)
        {

        }
        /// <summary>
        /// 编辑当前节点
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void edittoolstripmenuitem_click(object sender, eventargs e)
        {

        }
        /// <summary>
        /// 删除当前节点
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void deltoolstripmenuitem_click(object sender, eventargs e)
        {

        }
        /// <summary>
        /// 添加同层节点
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void addleveltoolstripmenuitem_click(object sender, eventargs e)
        {

        }


    }