/// <summary>
/// 节点选中后的事件
/// </summary>
/// User:Ryan CreateTime:2012-9-28 15:42.
void PopDownTree_AfterCheck(object sender, TreeViewEventArgs e)
{
TreeNodeEx node = e.Node as TreeNodeEx;
if (node != null)
{
if (node is DefaultTreeNode)
{
return;
}
else
{
//add
if (node.Checked)
{
this._CheckedNodes.Add(node);
}
//remove
else
{
this._CheckedNodes.Remove(node);
}
//update text
this.UpdateText(node);
}
}
}
/// <summary>
/// 绑定一级节点
/// </summary>
/// <param name="item">The item.</param>
/// User:Ryan CreateTime:2012-9-27 17:39.
protected virtual void BindRootNode(object item)
{
TreeNodeEx node = this.GetRootNode(item);
this.PopDownTree.Nodes.Add(node);
//绑定子节点
this.BindChildNode(item, node);
}
/// <summary>
/// 获取指定接的的全部值
/// </summary>
/// User:Ryan CreateTime:2012-9-27 19:25.
private List <string> GetFullPathValues(TreeNodeEx node)
{
List <string> list = new List <string>();
list.Add(node.Value);
if (node.Parent != null)
{
list.AddRange(this.GetFullPathValues(node.Parent as TreeNodeEx));
}
return(list);
}
/// <summary>
/// 绑定子节点（自反射数据源）
/// </summary>
/// <param name="item">The item.</param>
/// <param name="node">The node.</param>
/// User:Ryan CreateTime:2012-9-27 17:39.
protected virtual void BindChildNode(object item, TreeNodeEx node)
{
//绑定多级节点
if (!string.IsNullOrEmpty(this.MultiLevelDataSourceMember))
{
object dataSource = item.TryGetValue(this.MultiLevelDataSourceMember);
if (dataSource != null)
{
this.BindChildNode(node, dataSource);
}
}
}
/// <summary>
/// 设置当即选中树节点
/// </summary>
/// <param name="node">The node.</param>
/// User:Ryan CreateTime:2012-9-27 20:14.
private void SetSelectedNode(TreeNodeEx node)
{
this.UpdateText(node);
if (node is DefaultTreeNode)
{
this.SelectedNode = null;
}
else
{
this.SelectedNode = node;
if (this.OnTreeNodeSelected != null)
{
TreeNodeEventArgs args = new TreeNodeEventArgs();
args.SelectedNode = this.SelectedNode;
this.OnTreeNodeSelected(this.PopDownTree, args);
}
}
}
/// <summary>
/// 树节点展开处理事件
/// </summary>
/// <param name="sender">(控件对象).The source of the event.</param>
/// <param name="e">(事件数据).The <see cref="System.Windows.Forms.TreeViewCancelEventArgs"/> instance containing the event data.</param>
/// User:Ryan CreateTime:2012-9-27 18:50.
void PopDownTree_BeforeExpand(object sender, TreeViewCancelEventArgs e)
{
TreeNodeEx node = e.Node as TreeNodeEx;
if (!node.LeafNode && node.Datasource == null && node.Nodes[0] != null && node.Nodes[0] is EmptyTreeNode)
{
//clear data
node.LeafNode = true;
node.Nodes.Clear();
//实现该事件以加载子节点数据
if (this.LoadChildNodesDataSource != null)
{
TreeNodeEventArgs args = new TreeNodeEventArgs();
args.SelectedNode = node;
this.LoadChildNodesDataSource(sender, args);
//bind data
this.BindChildNode(node, args.DataSource);
}
}
}
private void SetCheckedNodeByValues(string[] values, TreeNodeEx node)
{
if (node == null)
{
return;
}
if (values.Contains(node.Value))
{
node.Checked = true;
}
else
{
if (node.Nodes != null && node.Nodes.Count > 0)
{
foreach (TreeNodeEx item in node.Nodes)
{
this.SetCheckedNodeByValues(values, item);
}
}
}
}
private List <TreeNodeEx> GetCheckedNodes(TreeNodeEx node)
{
if (node != null && this.PopDownTree.CheckBoxes)
{
List <TreeNodeEx> list = new List <TreeNodeEx>();
if (node.Checked)
{
list.Add(node);
}
if (node.Nodes != null && node.Nodes.Count > 0)
{
list.AddRange(this.GetCheckedNodes(node));
}
return(list);
}
else
{
return(null);
}
}
/// <summary>
/// BindChildNode 绑定子节点（指定数据源）
/// </summary>
/// <param name="node">The node.</param>
/// <param name="dataSource">The data source.</param>
/// User:Ryan CreateTime:2012-9-27 17:40.
protected virtual void BindChildNode(TreeNodeEx node, object dataSource)
{
//验证绑定树的深度：如果TreeMaxDegree为0标示无限级数，其它只绑定相应级数的数据
if (node != null && dataSource != null && (this.TreeMaxDegree == 0 || node.Level < this.TreeMaxDegree - 1))
{
node.Datasource = dataSource;
//get data source
IEnumerable source = this.GetSource(dataSource);
if (source == null)
{
throw new ArgumentException("数据源必须是支持枚举器的列表数据！");
}
//bind data
node.Nodes.Clear();
foreach (object item in source)
{
TreeNodeEx childNode = this.GetChildNode(node, item);
node.Nodes.Add(childNode);
this.BindChildNode(item, childNode);
}
}
}
/// <summary>
/// 更新文本框显示的文本
/// </summary>
/// <param name="node">The node.</param>
/// User:Ryan CreateTime:2012-9-27 21:58.
private void UpdateText(TreeNodeEx node)
{
if (node == null)
{
return;
}
if (this.CheckBox)
{
this.Text = this.GetCheckedTexts();
}
else
{
if (this.ShowFullPathText)
{
this.Text = node.FullPath;
}
else
{
this.Text = node.Text;
}
}
}
private void SetSelectedNodeByValue(string value, TreeNodeEx node)
{
if (node == null)
{
return;
}
if (node.Value.Equals(value))
{
//this.SelectedNode = node;
this.SetSelectedNode(node);
return;
}
else
{
if (node.Nodes != null && node.Nodes.Count > 0)
{
foreach (TreeNodeEx item in node.Nodes)
{
this.SetSelectedNodeByValue(value, item);
}
}
}
}
protected virtual TreeNodeEx GetChildNode(TreeNodeEx node, object item)
{
return(new TreeNodeEx(this, item, node.Level == this.TreeMaxDegree - 2 ? true : false));
}