using System;

 using System.Collections.Generic;

 using System.Text;

 using System.Drawing;

 using Aga.Controls.Properties;

 using System.Windows.Forms;

 using System.Windows.Forms.VisualStyles;

 namespace Aga.Controls.Tree.NodeControls

 {

 	internal class NodePlusMinus : NodeControl

 	{

 		public const int ImageSize = 9;

 		public const int Width = 16;

 		private Bitmap _plus;

 		private Bitmap _minus;

 		private VisualStyleRenderer _openedRenderer;

 		private VisualStyleRenderer OpenedRenderer

 		{

 			get

 			{

 				if (_openedRenderer == null)

 					_openedRenderer = new VisualStyleRenderer(VisualStyleElement.TreeView.Glyph.Opened);

 				return _openedRenderer;

 			}

 		}

 		private VisualStyleRenderer _closedRenderer;

 		private VisualStyleRenderer ClosedRenderer

 		{

 			get

 			{

 				if (_closedRenderer == null)

 					_closedRenderer = new VisualStyleRenderer(VisualStyleElement.TreeView.Glyph.Closed);

 				return _closedRenderer;

 			}

 		}

 		public NodePlusMinus()

 		{

 			_plus = Resources.plus;

 			_minus = Resources.minus;

 		}

 		public override Size MeasureSize(TreeNodeAdv node, DrawContext context)

 		{

 			return new Size(Width, Width);

 		}

 		public override void Draw(TreeNodeAdv node, DrawContext context)

 		{

 			if (node.CanExpand)

 			{

 				Rectangle r = context.Bounds;

 				int dy = (int)Math.Round((float)(r.Height - ImageSize) / 2);

 				if (Application.RenderWithVisualStyles)

 				{

 					VisualStyleRenderer renderer;

 					if (node.IsExpanded)

 						renderer = OpenedRenderer;

 					else

 						renderer = ClosedRenderer;

 					renderer.DrawBackground(context.Graphics, new Rectangle(r.X, r.Y + dy, ImageSize, ImageSize));

 				}

 				else

 				{

 					Image img;

 					if (node.IsExpanded)

 						img = _minus;

 					else

 						img = _plus;

 					context.Graphics.DrawImageUnscaled(img, new Point(r.X, r.Y + dy));

 				}

 			}

 		}

 		public override void MouseDown(TreeNodeAdvMouseEventArgs args)

 		{

 			if (args.Button == MouseButtons.Left)

 			{

 				args.Handled = true;

 				if (args.Node.CanExpand)

 					args.Node.IsExpanded = !args.Node.IsExpanded;

 			}

 		}

 		public override void MouseDoubleClick(TreeNodeAdvMouseEventArgs args)

 		{

 			args.Handled = true; // Supress expand/collapse when double click on plus/minus

 		}

 	}

 }