Visual Style Element Browser

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
using System.Reflection;

namespace WinApp1
{
	public partial class VisualStyleTree : UserControl
	{
		public event TreeViewEventHandler AfterSelect;
		public VisualStyleTree()
		{
			InitializeComponent();
			PopulateVisualStyleList();
			m_treeView.SelectedNode = m_treeView.Nodes[0];
		}
		public VisualStyleElement SelectedElement
		{
			get
			{
				Item item = m_treeView.SelectedNode.Tag as Item;
				if (item != null)
					return item.Element;
				return null;
			}
		}
		void PopulateVisualStyleList()
		{
			try
			{
				AddType(typeof(VisualStyleElement), null);
			}
			catch (InvalidOperationException error)
			{
				m_treeView.Nodes.Add(error.Message);
			}
			foreach (TreeNode node in m_treeView.Nodes)
				node.ExpandAll();

			ContextMenu menu = new ContextMenu();
			menu.MenuItems.Add(new MenuItem("Expand", new EventHandler(OnExpandSingle)));
			menu.MenuItems.Add(new MenuItem("Expand All", new EventHandler(OnExpandAll)));
			menu.MenuItems.Add(new MenuItem("Collapse All", new EventHandler(OnCollapseAll)));
			m_treeView.ContextMenu = menu;
		}
		void OnExpandSingle(object sender, EventArgs e)
		{
			m_treeView.BeginUpdate();
			m_treeView.SelectedNode.ExpandAll();
			m_treeView.EndUpdate();
		}
		void OnExpandAll(object sender, EventArgs e)
		{
			m_treeView.BeginUpdate();
			TreeNode selnode = m_treeView.SelectedNode;
			foreach (TreeNode node in m_treeView.Nodes)
				node.ExpandAll();
			m_treeView.SelectedNode = selnode;
			m_treeView.EndUpdate();
		}
		void OnCollapseAll(object sender, EventArgs e)
		{
			m_treeView.BeginUpdate();
			foreach (TreeNode node in m_treeView.Nodes)
				node.Collapse();
			m_treeView.EndUpdate();
		}
		class Item
		{
			public string Name;
			public PropertyInfo PropertyInfo;
			public VisualStyleElement Element;
			public Item(string name, PropertyInfo proeprtyinfo, VisualStyleElement element)
			{
				Name = name;
				Element = element;
				PropertyInfo = proeprtyinfo;
			}
			public override string ToString()
			{
				return Name;
			}
		}
		void AddType(Type type, TreeNode parent)
		{
			Type[] types = type.GetNestedTypes();
			foreach (Type subtype in types)
			{
				TreeNode node;
				if (parent == null)
					node = m_treeView.Nodes.Add(subtype.Name);
				else
					node = parent.Nodes.Add(subtype.Name);
				AddType(subtype, node);
			}
			PropertyInfo[] properties = type.GetProperties();
			foreach (PropertyInfo property in properties)
			{
				if (property.PropertyType != typeof(VisualStyleElement))
					continue;

				VisualStyleElement element = property.GetValue(null, BindingFlags.Static, null, null, null) as VisualStyleElement;
				string name = property.Name;
				if (VisualStyleRenderer.IsElementDefined(element) == false)
					name += " (Not defined)";
				TreeNode node = parent.Nodes.Add(name);
				node.Tag = new Item(property.DeclaringType.FullName + "+" + property.Name, property, element);
			}
		}
		private void OnTreeDrawNode(object sender, DrawTreeNodeEventArgs e)
		{
			Item item = e.Node.Tag as Item;
			e.DrawDefault = true;
			if (item == null)
				return;
			if (VisualStyleRenderer.IsElementDefined(item.Element) == false)
				return;
			
			Rectangle r = e.Bounds;
			r.Width += 20;
			e.Graphics.DrawString(e.Node.Text, Font, Brushes.Black, r, null);

			VisualStyleRenderer rendere = new VisualStyleRenderer(item.Element);
			r.Y      += 1;
			r.Height -= 1;
			r.X = 180;
			r.Width = 50;
			Size size = rendere.GetPartSize(e.Graphics, r, ThemeSizeType.True);
			rendere.DrawBackground(e.Graphics, r);
		}
		private void OnTreeAfterSelect(object sender, TreeViewEventArgs e)
		{
			string s = string.Empty;
			Item item = m_treeView.SelectedNode.Tag as Item;
			if (item != null)
			{
				s = item.Name.Replace("System.Windows.Forms.VisualStyles.", "");
				s = s.Replace('+', '.');
			}
			m_label.Text = s;
			if (AfterSelect != null)
				AfterSelect(this, e);
		}
	}
}