using System;

 using System.Collections.Generic;

 using System.Text;

 using System.Drawing;

 using Aga.Controls.Properties;

 namespace Aga.Controls.Tree.NodeControls

 {

 	public class NodeStateIcon: NodeIcon

 	{

 		private Image _leaf;

 		private Image _opened;

 		private Image _closed;

 		public NodeStateIcon()

 		{

 			_leaf = MakeTransparent(Resources.Leaf);

 			_opened = MakeTransparent(Resources.Folder);

 			_closed = MakeTransparent(Resources.FolderClosed);

 		}

 		private static Image MakeTransparent(Bitmap bitmap)

 		{

 			bitmap.MakeTransparent(bitmap.GetPixel(0,0));

 			return bitmap;

 		}

 		protected override Image GetIcon(TreeNodeAdv node)

 		{

 			Image icon = base.GetIcon(node);

 			if (icon != null)

 				return icon;

 			else if (node.IsLeaf)

 				return _leaf;

 			else if (node.CanExpand && node.IsExpanded)

 				return _opened;

 			else

 				return _closed;

 		}

 	}

 }