Little Registry Cleaner/Common Tools/TreeViewAdv/Tree/Node.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Collections.ObjectModel;
using System.Windows.Forms;
using System.Drawing;

namespace Common_Tools.TreeViewAdv.Tree
{
	public class Node
	{
		#region NodeCollection

		private class NodeCollection : Collection<Node>
		{
			private Node _owner;

			public NodeCollection(Node owner)
			{
				_owner = owner;
			}

			protected override void ClearItems()
			{
				while (this.Count != 0)
					this.RemoveAt(this.Count - 1);
			}

			protected override void InsertItem(int index, Node item)
			{
				if (item == null)
					throw new ArgumentNullException("item");

				if (item.Parent != _owner)
				{
					if (item.Parent != null)
						item.Parent.Nodes.Remove(item);
					item._parent = _owner;
					item._index = index;
					for (int i = index; i < Count; i++)
						this[i]._index++;
					base.InsertItem(index, item);

					TreeModel model = _owner.FindModel();
					if (model != null)
						model.OnNodeInserted(_owner, index, item);
				}
			}

			protected override void RemoveItem(int index)
			{
				Node item = this[index];
				item._parent = null;
				item._index = -1;
				for (int i = index + 1; i < Count; i++)
					this[i]._index--;
				base.RemoveItem(index);

				TreeModel model = _owner.FindModel();
				if (model != null)