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

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

namespace Common_Tools.TreeViewAdv.Tree
{
	internal class TreeColumnCollection : Collection<TreeColumn>
	{
		private TreeViewAdv _treeView;

		public TreeColumnCollection(TreeViewAdv treeView)
		{
			_treeView = treeView;
		}

		protected override void InsertItem(int index, TreeColumn item)
		{
			base.InsertItem(index, item);
			BindEvents(item);
			_treeView.UpdateColumns();
		}

		protected override void RemoveItem(int index)
		{
			UnbindEvents(this[index]);
			base.RemoveItem(index);
			_treeView.UpdateColumns();
		}

		protected override void SetItem(int index, TreeColumn item)
		{
			UnbindEvents(this[index]);
			base.SetItem(index, item);
			item.Owner = this;
			BindEvents(item);
			_treeView.UpdateColumns();
		}

		protected override void ClearItems()
		{
			foreach (TreeColumn c in Items)
				UnbindEvents(c);
			Items.Clear();
			_treeView.UpdateColumns();
		}

		private void BindEvents(TreeColumn item)
		{
			item.Owner = this;
			item.HeaderChanged += HeaderChanged;
			item.IsVisibleChanged += IsVisibleChanged;
			item.WidthChanged += WidthChanged;
			item.SortOrderChanged += SortOrderChanged;
		}

		private void UnbindEvents(TreeColumn item)
		{