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;

		}

	}

}