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

		}

	}

}