devexpress treelist ，treelist checkbox，treelist右击菜单使用

TREELIST

1. 绑定数据源

//如果只是无层级tree，可不绑定PID
treeList1.DataSource = treeData;//数据源
treeList1.KeyFieldName = "ID"; //主键字段名称
treeList1.ParentFieldName = "PID"; //父级字段名称
            

2. 展开节点

//展开所有节点
treeList1.ExpandAll();
//treeList1.ExpandToLevel(0);展开节点level 展开1级菜单 --》二级菜单

3. 开启checkbox
   AllowIndeterminateCheckState TREELIST 第三种状态
   OptionsView.ShowColumns = False//不显示列标题
   OptionsView.ShowCheckBoxes = True //开启复选框
   如果想达到选择父节点，子节点也同时选中的效果，需将treeList.OptionsBehavior.AllowRecursiveNodeChecking设置为True。

4. 注册事件

treeList1.DoubleClick += new EventHandler(treeList_DoubleClick);//注册双击事件 
private void treeList_DoubleClick(object sender, EventArgs e)
{           TreeList tree = sender as TreeList;
            //var tableName = tree.FocusedNode.GetDisplayText(0);
            var treeDoubleValue = tree.FocusedValue.ToString();//节点显示的NAME值
           var ID= tree.FocusedNode.GetValue("列filedName").ToString();//节点绑定的字段值
}

//注册列Draw事件
treeListNavUP.CustomDrawNodeCell += new CustomDrawNodeCellEventHandler(treeListNavUP_CustomDrawNodeCell);//注册列Draw事件 可用于节点列的背景颜色设置或者checkbox勾选设置   类似的事件还有CustomColumnDisplayText 用于重写显示的Name值

private void treeListNavUP_CustomDrawNodeCell(object sender, CustomDrawNodeCellEventArgs e)
        {    //TreeListNode node = sender as TreeListNode;
            //checkList 为需要选中的数据 用于设置选中状态
            foreach (var item in checkList)
            {
                if (e.Node.GetValue("ID").ToString() == item)
                {
                    e.Node.CheckState = CheckState.Checked;
                    e.Node.ParentNode.CheckState = CheckState.Indeterminate;
                    e.Node.ParentNode.ParentNode.CheckState = CheckState.Indeterminate;
                    SyncNodeCheckState_Parent(e.Node, CheckState.Checked);
                }
            }
            if (e.Node.CheckState == CheckState.Checked || e.Node.CheckState == CheckState.Indeterminate)
            {
                e.Appearance.BackColor = Color.LightBlue;
            }
        }


        private void treeListNavUP_CustomColumnDisplayText(object sender, CustomColumnDisplayTextEventArgs e)
        {
           var ID=  e.Node.GetValue("ID").ToString();//可根据ID值改变显示的NAME值
            if (e.Column.FieldName == "ID") {//可根据列绑定的字段名称改变显示的NAME值

                e.DisplayText = "";
            }
        }

5. 父子节点级联勾选
   注册事件 treeListNavUP_AfterCheckNode treeListNavUP_BeforeCheckNode

		private void treeListNavUP_AfterCheckNode(object sender, NodeEventArgs e)
        {
            SetCheckedChildNodes(e.Node, e.Node.CheckState);// 设置子节点的状态
            SyncNodeCheckParentState(e.Node, e.Node.CheckState);//设置父节点的状态
        }
        
         private void treeListNavUP_BeforeCheckNode(object sender, CheckNodeEventArgs e)
        {
           e.State = (e.PrevState == CheckState.Checked ? CheckState.Unchecked : CheckState.Checked);
        }

private static void SyncNodeCheckParentState(TreeListNode node, CheckState check)
        {
            if (node.ParentNode != null)
            {
                bool _cked = false;
                CheckState _ckState;
                foreach (TreeListNode cn in node.ParentNode.Nodes)
                {
                    _ckState = cn.CheckState;
                    if (check != _ckState)
                    {
                        _cked = !_cked;
                        break;
                    }
                }
                node.ParentNode.CheckState = _cked ? CheckState.Indeterminate : check;
                SyncNodeCheckParentState(node.ParentNode, check);
            }
        }
        /// 

        /// 设置子节点的状态
        /// 
        /// 
        /// 
        private void SetCheckedChildNodes(DevExpress.XtraTreeList.Nodes.TreeListNode node, CheckState check)
        {
            for (int i = 0; i < node.Nodes.Count; i++)
            {
                node.Nodes[i].CheckState = check;
                SetCheckedChildNodes(node.Nodes[i], check);
            }
        }

6. treelist 右击菜单
   1、拖入控件popupMenu
   
   2、 Run Designer 点击add可以增加自己需要的控件
   
   3、注册itemclick事件

private void bindusertable_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
 {
 //ToDo 
 }
        ```
7、给treelist注册单击事件 

```csharp
 /// 

        /// treelist 右击弹出菜单
        /// 添加
        /// 
        /// 
        /// 
        private void treeList1_MouseClick(object sender, MouseEventArgs e)
        {
            try
            {
                TreeList tree = sender as TreeList;
                //判断是鼠标右击
                if (e.Button == MouseButtons.Right
                        && ModifierKeys == Keys.None
                        && treeList1.State == TreeListState.Regular)
                {
                    Point p = new Point(Cursor.Position.X, Cursor.Position.Y);//位置
                    
                    TreeListHitInfo hitInfo = tree.CalcHitInfo(e.Location);

                    if (hitInfo.HitInfoType == HitInfoType.Cell)
                    {
                        tree.SetFocusedNode(hitInfo.Node);
                    }

                    if (tree.FocusedNode != null)
                    {
                        TreeFocusNode = tree.FocusedNode;//鼠标焦点所在的node
                        //获取点击菜单 的值 进行判断 不是表 就弹出菜单1 是表就弹出菜单2
                        string focusValue = tree.FocusedNode.GetValue(0).ToString();//点击菜单的值
                        string focusValueId = tree.FocusedNode.GetValue(treeId).ToString();//点击菜单的id
                       //根据不同条件显示不同popup
                        if (focusValue == "条件")
                        {
                            popupMenu3.ShowPopup(p);//新建专题
                        }
                        else
                        {
                            if (string.IsNullOrEmpty(tableName))//不是表
                                popupMenu1.ShowPopup(p);//绑定用户表
                            else
                                popupMenu2.ShowPopup(p);//移除分类
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                return;
            }
        }

8. 节点绑定图片
   事件GetSelectImage
   页面拖入控件ImageList，然后添加图像
   

/// 

        /// tree 图片
        /// 
        /// 
        /// 
        private void TreeListGeo_GetSelectImage(object sender, DevExpress.XtraTreeList.GetSelectImageEventArgs e)
        {
            if (e.Node == null) return;
            TreeListNode node = e.Node;
            string nodeVal = node.GetValue("id").ToString();
             if (node.GetDisplayText(0).ToString() == yuanshuju)
            {
                e.NodeImageIndex = 3;//根据 NodeImageIndex 执行图片
            }
        }