Devexpress treelist 树形控件 实现带三种状态的CheckBox

it2022-05-09  55

树形控件是使用频率很高的一种控件。对于属性控件往往需要下面两个功能

1.TreeList带有CheckBox,并且节点要有三种状态(所有的子节点都选中,所有的子节点都没选择,一部分子节点选中)。使用 DevXpress的TreeList控件很容易实现这一功能。

设置TreeList.OptionsView.ShowCheckBoxes = true            //是否显示CheckBox

设置TreeList.OptionsBehavior.AllowIndeterminateCheckState = true;         //设置节点是否有中间状态,即一部分子节点选中,一部分子节点没有选中

设置这两个属性之后就实现了TreeList带有CheckBox,并且节点有三种状态。

2.选中父节点或者子节点相互影响的功能,如选择父节点选择所有子节点。绑定TreeList的两个事件AfterCheckNode和 BeforeCheckNode

实现功能的代码如下:

        private void treeList1_AfterCheckNode(object sender, DevExpress.XtraTreeList.NodeEventArgs e)        {            SetCheckedChildNodes(e.Node, e.Node.CheckState);            SetCheckedParentNodes(e.Node, e.Node.CheckState);

        }

        private void treeList1_BeforeCheckNode(object sender, DevExpress.XtraTreeList.CheckNodeEventArgs e)        {            e.State = (e.PrevState == CheckState.Checked ? CheckState.Unchecked : CheckState.Checked);        }

        /// <summary>        /// 设置子节点的状态        /// </summary>        /// <param name="node"></param>        /// <param name="check"></param>        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>        /// 设置父节点的状态        /// </summary>        /// <param name="node"></param>        /// <param name="check"></param>        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;                    }                }                node.ParentNode.CheckState = b ? CheckState.Indeterminate : check;                SetCheckedParentNodes(node.ParentNode, check);            }        }

转载于:https://www.cnblogs.com/goto/p/4092086.html

相关资源:树形列表控件(C#,Winfrom)

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