using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace ImageListBox
{
	/// <summary>
	/// ImageListBox malt schöne Bildchen
	/// wenn man als Items voll referenzierte Pfade zu Bildern liefert,
	/// welche mit ImageFromFile geladen werden können.
	/// 
	/// Exceptions werden direkt in der ListBox angezeigt !!
	/// 
	/// Erstellt durch: Programmierhans
	/// Art:            Freeware
	/// Zeitaufwand:	20 Minuten (wobei die Thumb-Methode schon existiert hat)
	/// </summary>
	public class ImageListBox : ListBox
	{
		public ImageListBox():base()
		{
			this.DrawMode=DrawMode.OwnerDrawFixed;
		}

		protected override void OnDrawItem(DrawItemEventArgs e)
		{
			base.OnDrawItem(e);
			if (e.Index>-1 && this.Items.Count>e.Index)
			{
				object itm=this.Items[e.Index];
				if (itm!=null)
				{
					string fileName=itm.ToString();
					if (System.IO.File.Exists(fileName))
					{
						Image img=null;
						try
						{
							img=Image.FromFile(fileName);
							if (img!=null)
							{
								Graphics g=e.Graphics;
								Image img2=this.GetThumbnail(img,e.Bounds);
								g.DrawImageUnscaled(img2,e.Bounds);
							}
						}
						catch (Exception ex)
						{
							Graphics g=e.Graphics;
							StringFormat sf=new StringFormat();
							sf.Trimming=StringTrimming.EllipsisCharacter;
							string message=string.Format("{0} konnte nicht geladen werden. Exception: {1}",fileName,ex.ToString());
							g.DrawString(message,this.Font,new SolidBrush(this.ForeColor),e.Bounds,sf);
						}
					}
				}
			}
		}
		
		private Image GetThumbnail(Image pImage, Rectangle pBounds)
		{
			Image ret=new Bitmap(pBounds.Width,pBounds.Height);
			Graphics g=Graphics.FromImage(ret);
			g.FillRectangle(new SolidBrush(Color.White),0,0,ret.Width,ret.Height);
            
			float factor = Math.Max ((float)pImage.Width/(float)pBounds.Width, (float)pImage.Height/(float)pBounds.Height);
			g.DrawImage(pImage,0,0,(float)pImage.Width/factor,(float)pImage.Height/factor);
			g.Dispose();
            
			return ret;
		}

	}
}

		private void Form1_Load(object sender, System.EventArgs e)
		{
			//Höhe der Items festlegen (die Breite floatet)
			this.imageListBox1.ItemHeight=80;

			string windir = System.Environment.GetEnvironmentVariable ("SystemRoot");
			string[] files=System.IO.Directory.GetFiles(windir,"*.bmp");
			foreach (string file in files)
			{
				this.imageListBox1.Items.Add(file);
			}
		}

this.imageListBox.ItemHeight=80;

public class ImageListBox : ListBox