IconList.cs

using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using be.gaudry.model.drawing;
 
namespace be.gaudry.view.controls
{
    /// <summary>
    /// Extends ImageList features.
    /// If the icon is not yet in the imagelist, 
    /// add it before return it.
    /// </summary>
    public partial class IconList : Component
    {
        private Hashtable m_ExtensionIndex;
        private ImageList m_ImageList;
 
        public IconList()
        {
            m_ExtensionIndex = new Hashtable();
            m_ImageList = new ImageList();
            InitializeComponent();
        }
 
        public IconList(IContainer container)
        {
            m_ExtensionIndex = new Hashtable();
            m_ImageList = new ImageList(container);
            m_ImageList.ColorDepth = ColorDepth.Depth32Bit;
            container.Add(this);
 
            InitializeComponent();
        }
 
        public int this[string fileName]
        {
            get
            {
                string extension = Path.GetExtension(fileName);
                string key;
 
                if (extension == ".ico" || extension == ".exe" || extension == ".lnk")
                {
                    key = fileName;
                }
                else
                {
                    key = extension;
                }
 
                if (!m_ExtensionIndex.ContainsKey(key))
                {
                    Icon icon = IconExtractor.ExtractIcon(fileName);
 
                    int index = m_ImageList.Images.Add(icon.ToBitmap(), Color.Transparent);
 
                    m_ExtensionIndex.Add(key, index);
                }
 
                return (int)m_ExtensionIndex[key];
            }
        }
        /// <summary>
        /// Get the system icon associated to the file. 
        /// If not yet exists in the imagelist, add it.
        /// </summary>
        /// <param name="fileName">(String) name of the file</param>
        /// <returns>(Image) System Icon</returns>
        public Image getImage(string fileName)
        {
            /*
             * todo : if file not found, 
             * create a temp file with the same extension, 
             * call again this method with the temp file, 
             * and delete the temp file.
             */ 
            return this.ImageList.Images[this[fileName]];
        }
 
        public int addIcon(string fileName)
        {
            return this[fileName];
        }
 
        public ImageList ImageList
        {
            get
            {
                return m_ImageList;
            }
        }
 
    }
}