Dev Express TreeList 控件 常用方法小結

常用方法： 

複選框的操作( 複選框選中狀態改變時，改變相應的父節點和子節點 的選中狀態)
獲取所有選中狀態的數據的主鍵集合
一些常用的屬性 
1. 複選框的操作

      顯示覆選框  ShowCheckBoxes屬性設爲True， 有用到BeforeCheckNode和AfterCheckNode 事件 

  

   

   #region 複選框的操作
        private void treeNavigation_AfterCheckNode(object sender, NodeEventArgs e)
        {
            SetCheckedChildNodes(e.Node, e.Node.CheckState);
            SetCheckedParentNodes(e.Node, e.Node.CheckState);
        }
        private void treeNavigation_BeforeCheckNode(object sender, CheckNodeEventArgs e)
        {
            e.State = (e.PrevState == CheckState.Checked ? CheckState.Unchecked : CheckState.Checked);
        }
 
        /// <summary>
        /// 設置子節點的狀態
        /// </summary> 
        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);
            }
        }
        /// <summary>
        /// 設置父節點的狀態
        /// </summary> 
        private void SetCheckedParentNodes(DevExpress.XtraTreeList.Nodes.TreeListNode node, CheckState check)
        {
            if (node.ParentNode != null)
            {
                bool b = false;
                CheckState state;
                for (int i = 0; i < node.ParentNode.Nodes.Count; i++)
                {
                    state = (CheckState)node.ParentNode.Nodes[i].CheckState;
                    if (!check.Equals(state))
                    {
                        b = !b;
                        break;
                    }
                }
                if (b)
                {
                    node.ParentNode.CheckState = CheckState.Indeterminate;
                }
                else
                {
                    node.ParentNode.CheckState = check;
                }
                SetCheckedParentNodes(node.ParentNode, check);
            }
        }
        #endregion

2   獲取所有選中狀態的數據的主鍵集合   代碼如下  

 

private void barBtnSave_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
    if (treeNavigation.Nodes.Count > 0)
    {
        foreach (TreeListNode root in treeNavigation.Nodes)
        {
            GetCheckedAuthorizatioId(root);
        }
    }
    // AuthorizatioIdList 變量就是 選中狀態的數據的主鍵集合 
}
        private List<string> AuthorizatioIdList = new List<string>();//所選擇的權限的ID集合
        /// <summary>
        /// 獲取選擇狀態的數據主鍵ID集合 
        /// </summary>
        /// <param name="parentNode">父級節點</param>
        private void GetCheckedAuthorizatioId(TreeListNode parentNode)
        {
            if (parentNode.Nodes.Count == 0)
            {
                return;//遞歸終止
            }
            foreach (TreeListNode node in parentNode.Nodes)
            {
                if (node.CheckState == CheckState.Checked)
                {
                    DataRowView drv = treeNavigation.GetDataRecordByNode(node) as DataRowView;
                    if (drv != null)
                    {
                        string nav_id = drv["nav_id"].ToString();
                        AuthorizatioIdList.Add(nav_id);
                    }
                }
                GetCheckedAuthorizatioId(node);
            }
        }

3 一些常用的屬性 

//treeNavigation.OptionsView.AutoWidth = false; //禁用自動寬度
//treeNavigation.Columns["stateName"].Width = 180; //設置指定列寬
//treeNavigation.BorderStyle = DevExpress.XtraEditors.Controls.BorderStyles.NoBorder;
//默認顯示下拉三角形樣式，設置TreeList的兩個皮膚屬性即可變成連接虛線
treeNavigation.LookAndFeel.UseDefaultLookAndFeel = false;
treeNavigation.LookAndFeel.UseWindowsXPTheme = true;
 
treeNavigation.OptionsView.ShowHorzLines = false; //是否顯示水平線。默認爲True； 
treeNavigation.OptionsView.ShowVertLines = true; //是否顯示垂直線。默認爲True； 
treeNavigation.OptionsView.ShowIndicator = false; //是否顯示Node的指示符面板，就是最左邊有個三角箭頭。默認爲True；
treeNavigation.OptionsView.ShowButtons = true; //是否顯示展開與收縮按鈕。默認爲True；
treeNavigation.OptionsView.ShowColumns = false; //是否顯示列標題。默認爲True；
treeNavigation.OptionsView.ShowIndentAsRowStyle = false; //是否用相應Node的Appearance設置來生成Tree的縮進（沒看懂）。默認爲False
treeNavigation.OptionsView.FocusRectStyle = DevExpress.XtraTreeList.DrawFocusRectStyle.None; //在獲得焦點的Cell上，是否顯示焦點框架。默認爲True；
 
//treeNavigation.OptionsView.FocusRectStyle = DrawFocusRectStyle.CellFocus;
treeNavigation.OptionsView.ShowRoot = true; //是否在根Node間顯示連接線。默認爲True；
treeNavigation.OptionsView.ShowCheckBoxes = false; //顯示勾選框。默認爲False
treeNavigation.OptionsDragAndDrop.DragNodesMode = DragNodesMode.None;//拖拽節點
treeNavigation.OptionsBehavior.ReadOnly = true; //只讀
treeNavigation.OptionsBehavior.Editable = false; //不可編輯
treeNavigation.OptionsBehavior.AllowIndeterminateCheckState = true; //設置節點是否有中間狀態，即一部分子節點選中，一部分子節點沒有選中
treeNavigation.OptionsSelection.InvertSelection = true; //選中風格是隻應用於選中的Cell
treeNavigation.OptionsSelection.MultiSelect = false; //允許多選 
treeNavigation.OptionsSelection.EnableAppearanceFocusedCell = true; //選中的Cell的Appearance設置是否可用 
treeNavigation.ExpandAll(); //展開所有層級 
// treeNavigation.ExpandToLevel(0); //展開的層級
 
////註冊這兩個事件實現選擇父節點自動選子節點，反之亦然 
//treeNavigation.BeforeCheckNode += treeNavigation_BeforeCheckNode; 
//treeNavigation.AfterCheckNode += treeNavigation_AfterCheckNode;
//treeNavigation.AfterFocusNode += treeNavigation_AfterFocusNode;
//treeNavigation.DoubleClick += treeNavigation_DoubleClick; //但要注意的是要在TreeList.OptionsBehavior.Editable = false的情況下，雙擊Node才能觸發該事件
 
////設置圖片 
//// treeNavigation.CustomDrawNodeImages += treeNavigation_CustomDrawNodeImages;
 
//// 顏色設置 
////  treeNavigation.Appearance.Row.BackColor = Color.Transparent;//節點默認背景色 
////  treeNavigation.Appearance.FocusedRow.BackColor = Color.Orange; // 選中節點的背景色 
////  treeNavigation.Appearance.HideSelectionRow.BackColor = Color.LightYellow;//選中節點失去焦點時的背景色

以上。