作者：jiankunking
要求如下：
1：选择父节点后，子节点全部打钩；
2：选择子节点而不选择父节点，则从当前节点的父节点一直到根节点check框都是半选状态。
3：当子节点均未勾选时，设置父节点状态为：未选中状态
具体实现如下：
一、OptionView—ShowCheckBoxes属性为true,则每个节点前面自动增加一个check框。
二、设置OptionBehavior—AllIndeterminateCheckState属性为true,则check框可以出现半选状态。
具体代码显示如下：
#region 树形 点击节点前
/// <summary>
/// 点击节点前
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void treeList_BeforeCheckNode(object sender, CheckNodeEventArgs e)
{
if (!this.ifMultipleChoice)
{
//选择前取消前面已经选择的，实现单选功能
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 树形 点击节点后
/// <summary>
/// 点击节点后
/// </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);
}
//从根节点往下 查询 是否有打钩的子节点，如果有那么 父节点的 半选状态不变 否则变为 不选择状态
//this.ValidParentNodeIsCanleSel(e.Node);
SetCheckedParentNodes(e.Node, e.Node.CheckState);
}
}
#endregion
#region 树形 节点操作集合
/// <summary>
/// 选择某个节点及其子节点
/// </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>
/// 勾选子节点后，修改父节点的状态
/// </summary>
/// <param name="node"></param>
private void ValidParentIsChecked(DevExpress.XtraTreeList.Nodes.TreeListNode node)
{
if (node.ParentNode != null)
{
//父节点未被选中
if (node.ParentNode.CheckState == CheckState.Unchecked)
{
//该节点有子节点 并且 该节点与子节点均被选中
if (node.HasChildren && ValidIsCheckAllChildNode(node.ParentNode))
{
node.ParentNode.CheckState = CheckState.Checked;
}
//该节点没有子节点 并且 其父节点下的子节点均被选中
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)
{
//该节点有子节点并且 子节点均未被选中时，修改其状态
if (node.HasChildren && (!this.ValidIsHasCheckChildNode(node)))
{
node.ParentNode.CheckState = CheckState.Unchecked;
}
// 该节点的父节点下所有节点均被选中 ValidIsCheckAllChildNode
else if (ValidIsCheckAllChildNode(node.ParentNode))
{
node.ParentNode.CheckState = CheckState.Checked;
}
}
this.ValidParentIsChecked(node.ParentNode);
}
}
/// <summary>
/// 从该节点往下 查询 是否有打钩的子节点，如果有那么 父节点的 半选、选中状态不变否则变为 不选择状态
/// </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)
{
//如果父节点的 状态为 半选 状态 这 根据父节点 判断子节点是否打钩
isSel = ValidIsHasCheckChildNode(node.ParentNode);
if (isSel == false)
{
//如果所有的 子节点 都没有 “选中”那么 父节点的状态 变为 非选中状态
node.ParentNode.CheckState = CheckState.Unchecked;
}
}
this.ValidParentNodeIsCanleSel(node.ParentNode);
}
}
/// <summary>
/// 判断该节点下是否有节点被选中，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>
/// 节点全选
/// </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 树形 获取全部子节点
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 树形 选择子节点时触发
/// <summary>
/// 选择子节点时触发
/// </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 树形 选择父节点时触发
/// <summary>
/// 选择父节点时触发
/// </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 树形 判断此节点下的所有孩子节点是否选中
/// <summary>
/// 判断此节点下的所有孩子节点是否选中
/// </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
以上代码参考：点击打开链接
