dev treelist 常用用法小結

作者：jiankunking 出處：http://blog.csdn.net/jiankunking

要求如下：

具體程式碼顯示如下：

 #region 樹形 點選節點前
        /// <summary>  
        /// 點選節點前  
        /// </summary>  
        /// <param name="sender"></param>  
        /// <param name="e"></param>  
        private void treeList_BeforeCheckNode(object sender, CheckNodeEventArgs e)
        {
            if (!this.ifMultipleChoice)
            {
                //選擇前取消前面已經選擇的，實現單選功能
                List<DevExpress.XtraTreeList.Nodes.TreeListNode> treeListNodes = treeList.GetAllCheckedNodes();
                foreach (DevExpress.XtraTreeList.Nodes.TreeListNode node in treeListNodes)
                {
                    node.Checked = false;
                }
            }
            e.State = (e.PrevState == CheckState.Checked ? CheckState.Unchecked : CheckState.Checked);
        }
        #endregion

        #region 樹形 點選節點後
        /// <summary>  
        /// 點選節點後  
        /// </summary>  
        /// <param name="sender"></param>  
        /// <param name="e"></param>  
        private void treeList_AfterCheckNode(object sender, NodeEventArgs e)
        {
            if (!this.ifMultipleChoice)
            {
                return;
            }
            if (e.Node == null)
            {
                return;
            }
            if (e.Node.CheckState == CheckState.Indeterminate)
            {
                e.Node.CheckState = CheckState.Checked;
            }
            if (e.Node.CheckState == CheckState.Checked)
            {
                if (e.Node.HasChildren)
                {
                    this.CheckNode(e.Node);
                }
                this.ValidParentIsChecked(e.Node);
            }
            else if (e.Node.CheckState == CheckState.Unchecked)
            {
                if (e.Node.HasChildren)
                {
                    this.SetCheckedChildNodes(e.Node, CheckState.Unchecked);
                }
                //從根節點往下 查詢 是否有打鉤的子節點，如果有那麼 父節點的 半選狀態不變 否則變為 不選擇狀態  
                //this.ValidParentNodeIsCanleSel(e.Node);
                SetCheckedParentNodes(e.Node, e.Node.CheckState);

            }
        }
        #endregion

        #region 樹形 節點操作集合
        /// <summary>  
        /// 選擇某個節點及其子節點  
        /// </summary>  
        /// <param name="node"></param>  
        private void CheckNode(DevExpress.XtraTreeList.Nodes.TreeListNode node)
        {
            foreach (DevExpress.XtraTreeList.Nodes.TreeListNode cnode in node.Nodes)
            {
                if (cnode != null)
                {
                    cnode.CheckState = CheckState.Checked;
                }
                if (cnode.HasChildren)
                {
                    CheckNode(cnode);
                }
            }
        }

        /// <summary>  
        /// 勾選子節點後，修改父節點的狀態  
        /// </summary>  
        /// <param name="node"></param>  
        private void ValidParentIsChecked(DevExpress.XtraTreeList.Nodes.TreeListNode node)
        {
            if (node.ParentNode != null)
            {
                //父節點未被選中  
                if (node.ParentNode.CheckState == CheckState.Unchecked)
                {
                    //該節點有子節點 並且  該節點與子節點均被選中  
                    if (node.HasChildren && ValidIsCheckAllChildNode(node.ParentNode))
                    {
                        node.ParentNode.CheckState = CheckState.Checked;
                    }
                    //該節點沒有子節點 並且 其父節點下的子節點均被選中  
                    else if ((!node.HasChildren) && ValidIsCheckAllChildNode(node.ParentNode))
                    {
                        node.ParentNode.CheckState = CheckState.Checked;
                    }
                    else
                    {
                        node.ParentNode.CheckState = CheckState.Indeterminate;
                    }
                }
                else if (node.ParentNode.CheckState == CheckState.Indeterminate)
                {
                    //該節點有子節點並且 子節點均未被選中時，修改其狀態   
                    if (node.HasChildren && (!this.ValidIsHasCheckChildNode(node)))
                    {
                        node.ParentNode.CheckState = CheckState.Unchecked;
                    }
                    // 該節點的父節點下所有節點均被選中 ValidIsCheckAllChildNode  
                    else if (ValidIsCheckAllChildNode(node.ParentNode))
                    {
                        node.ParentNode.CheckState = CheckState.Checked;
                    }
                }
                this.ValidParentIsChecked(node.ParentNode);
            }
        }

        /// <summary>  
        /// 從該節點往下 查詢 是否有打鉤的子節點，如果有那麼 父節點的 半選、選中狀態不變否則變為 不選擇狀態  
        /// </summary>  
        /// <param name="node"></param>  
        private void ValidParentNodeIsCanleSel(DevExpress.XtraTreeList.Nodes.TreeListNode node)
        {
            bool isSel = false;
            if (node.ParentNode != null)
            {
                if (node.ParentNode.CheckState == CheckState.Indeterminate)
                {
                    //如果父節點的 狀態為 半選 狀態 這 根據父節點 判斷子節點是否打鉤  
                    isSel = ValidIsHasCheckChildNode(node.ParentNode);
                    if (isSel == false)
                    {
                        //如果所有的 子節點 都沒有 “選中”那麼 父節點的狀態 變為 非選中狀態  
                        node.ParentNode.CheckState = CheckState.Unchecked;
                    }
                }
                this.ValidParentNodeIsCanleSel(node.ParentNode);
            }
        }

        /// <summary>  
        /// 判斷該節點下是否有節點被選中，如果有返回true  
        /// </summary>  
        /// <param name="node"></param>  
        /// <returns></returns>  
        private bool ValidIsHasCheckChildNode(DevExpress.XtraTreeList.Nodes.TreeListNode node)
        {
            bool isCheck = false;
            foreach (DevExpress.XtraTreeList.Nodes.TreeListNode cnode in node.Nodes)
            {
                if (cnode != null)
                {
                    if (cnode.CheckState == CheckState.Checked)
                    {
                        isCheck = true;
                        return isCheck;
                    }
                }
                if (cnode.HasChildren)
                {
                    isCheck = this.ValidIsHasCheckChildNode(cnode);
                    if (isCheck == true)
                    {
                        return isCheck;
                    }
                }
            }
            return isCheck;
        }
        /// <summary>  
        /// 節點全選  
        /// </summary>  
        /// <param name="node"></param>  
        /// <returns></returns>  
        private bool ValidIsCheckAllChildNode(DevExpress.XtraTreeList.Nodes.TreeListNode node)
        {
            bool isCheck = true;
            foreach (DevExpress.XtraTreeList.Nodes.TreeListNode cnode in node.Nodes)
            {
                if (cnode != null)
                {
                    if (cnode.CheckState == CheckState.Unchecked)
                    {
                        isCheck = false;
                        return isCheck;
                    }
                }
                if (cnode.HasChildren)
                {
                    isCheck = this.ValidIsCheckAllChildNode(cnode);
                    if (isCheck == false)
                    {
                        return isCheck;
                    }
                }
            }
            return isCheck;
        }


        #endregion

        #region  樹形 獲取全部子節點
        private void GetChildNodes(TreeListNode parentNode, List<TreeListNode> list)
        {
            if (parentNode == null)
            {
                return;
            }
            if (parentNode.Nodes.Count > 0)
            {
                foreach (TreeListNode node in parentNode.Nodes)
                {
                    list.Add(node);
                    if (node.Nodes.Count > 0)
                    {
                        GetChildNodes(node, list);
                    }
                }
            }
        }
        #endregion

        #region 樹形 選擇子節點時觸發
        /// <summary>  
        /// 選擇子節點時觸發  
        /// </summary>  
        /// <param name="node"></param>  
        /// <param name="check"></param>  
        private void SetCheckedChildNodes(TreeListNode node, CheckState check)
        {
            foreach (TreeListNode tn in node.Nodes)
            {
                tn.CheckState = check;
                if (tn.HasChildren)
                {
                    SetCheckedChildNodes(tn, check);
                }
            }
        }
        #endregion

        #region  樹形 選擇父節點時觸發
        /// <summary>  
        /// 選擇父節點時觸發  
        /// </summary>  
        /// <param name="node"></param>  
        /// <param name="check"></param>  
        private void SetCheckedParentNodes(TreeListNode node, CheckState check)
        {
            if (node.ParentNode != null)
            {
                bool b = false;
                CheckState state;
                foreach (TreeListNode tln in node.ParentNode.Nodes)
                {
                    state = (CheckState)tln.CheckState;
                    if (!check.Equals(state))
                    {
                        b = !b;
                        break;
                    }
                }
                node.ParentNode.CheckState = b ? CheckState.Indeterminate : check;
                SetCheckedParentNodes(node.ParentNode, check);
            }
        }
        #endregion

        #region 樹形 判斷此節點下的所有孩子節點是否選中
        /// <summary>  
        /// 判斷此節點下的所有孩子節點是否選中  
        /// </summary>  
        /// <param name="node"></param>  
        /// <returns></returns>  
        private Boolean IsChildsChecked(TreeListNode node)
        {
            foreach (TreeListNode tln in node.ParentNode.Nodes)
            {
                if (tln.CheckState == CheckState.Unchecked)
                {
                    return false;
                }
                if (tln.HasChildren)
                {
                    IsChildsChecked(tln);
                }
            }
            return true;
        }
        #endregion