using System;

using System.Collections.Generic;

using System.Text;

using System.Drawing;

using System.Windows.Forms;

using Aga.Controls.Properties;

using System.ComponentModel;

namespace Aga.Controls.Tree.NodeControls

{

	public class NodeIcon : BindableControl

	{

		public NodeIcon()

		{

			LeftMargin = 1;

		}

		public override Size MeasureSize(TreeNodeAdv node, DrawContext context)

		{

			Image image = GetIcon(node);

			if (image != null)

				return image.Size;

			else

				return Size.Empty;

		}

		public override void Draw(TreeNodeAdv node, DrawContext context)

		{

			Image image = GetIcon(node);

			if (image != null)

			{

				Rectangle r = GetBounds(node, context);

				if ( image.Width > 0 && image.Height > 0 )

				{

					switch (_scaleMode)

					{

						case ImageScaleMode.Fit:

							context.Graphics.DrawImage(image, r);

							break;

						case ImageScaleMode.ScaleDown:

							{

								float factor = Math.Min((float)r.Width / (float)image.Width, (float)r.Height / (float)image.Height);

								if (factor < 1)

									context.Graphics.DrawImage(image, r.X, r.Y, image.Width * factor, image.Height * factor);

								else

									context.Graphics.DrawImage(image, r.X, r.Y, image.Width, image.Height);

							} break;

						case ImageScaleMode.ScaleUp:

							{

								float factor = Math.Max((float)r.Width / (float)image.Width, (float)r.Height / (float)image.Height);

								if (factor > 1)

									context.Graphics.DrawImage(image, r.X, r.Y, image.Width * factor, image.Height * factor);

								else

									context.Graphics.DrawImage(image, r.X, r.Y, image.Width, image.Height);

							} break;

						case ImageScaleMode.AlwaysScale:

							{

								float fx = (float)r.Width / (float)image.Width;

								float fy = (float)r.Height / (float)image.Height;

								if (Math.Min(fx, fy) < 1)

								{ //scale down

									float factor = Math.Min(fx, fy);

									context.Graphics.DrawImage(image, r.X, r.Y, image.Width * factor, image.Height * factor);

								}

								else if (Math.Max(fx, fy) > 1)

								{

									float factor = Math.Max(fx, fy);

									context.Graphics.DrawImage(image, r.X, r.Y, image.Width * factor, image.Height * factor);

								}

								else

									context.Graphics.DrawImage(image, r.X, r.Y, image.Width, image.Height);

							} break;

						case ImageScaleMode.Clip:

						default: 

							context.Graphics.DrawImage(image, r.X, r.Y, image.Width, image.Height);

							break;

					}

				}

			}

		}

		protected virtual Image GetIcon(TreeNodeAdv node)

		{

			return GetValue(node) as Image;

		}

        private ImageScaleMode _scaleMode = ImageScaleMode.Clip;

        [DefaultValue("Clip"), Category("Appearance")]

        public ImageScaleMode ScaleMode

        {

            get { return _scaleMode; }

            set { _scaleMode = value; }

        }

	}

}