Menu Text Provider Host

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/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald

Publisher: Apress
ISBN: 1590590457
*/

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

namespace ExtenderProviderHost
{
    /// <summary>
    /// Summary description for MenuTextProviderHost.
    /// </summary>
    public class MenuTextProviderHost : System.Windows.Forms.Form
    {
        internal System.Windows.Forms.MainMenu mnuMain;
        internal System.Windows.Forms.MenuItem MenuItem1;
        internal System.Windows.Forms.MenuItem mnuNew;
        internal System.Windows.Forms.MenuItem mnuOpen;
        internal System.Windows.Forms.MenuItem mnuSave;
        private MenuTextProvider menuTextProvider1;
        internal System.Windows.Forms.GroupBox GroupBox1;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;

        public MenuTextProviderHost()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if(components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.mnuMain = new System.Windows.Forms.MainMenu();
            this.MenuItem1 = new System.Windows.Forms.MenuItem();
            this.mnuNew = new System.Windows.Forms.MenuItem();
            this.mnuOpen = new System.Windows.Forms.MenuItem();
            this.mnuSave = new System.Windows.Forms.MenuItem();
            this.menuTextProvider1 = new MenuTextProvider();
            this.GroupBox1 = new System.Windows.Forms.GroupBox();
            this.SuspendLayout();
            // 
            // mnuMain
            // 
            this.mnuMain.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                    this.MenuItem1});
            // 
            // MenuItem1
            // 
            this.MenuItem1.Index = 0;
            this.MenuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                      this.mnuNew,
                                                                                      this.mnuOpen,
                                                                                      this.mnuSave});
            this.MenuItem1.Text = "File";
            // 
            // mnuNew
            // 
            this.mnuNew.Index = 0;
            this.mnuNew.Text = "New";
            // 
            // mnuOpen
            // 
            this.mnuOpen.Index = 1;
            this.mnuOpen.Text = "Open";
            // 
            // mnuSave
            // 
            this.mnuSave.Index = 2;
            this.mnuSave.Text = "Save";
            // 
            // menuTextProvider1
            // 
            this.menuTextProvider1.Location = new System.Drawing.Point(0, 244);
            this.menuTextProvider1.Name = "menuTextProvider1";
            this.menuTextProvider1.Size = new System.Drawing.Size(292, 22);
            this.menuTextProvider1.TabIndex = 0;
            this.menuTextProvider1.Text = "menuTextProvider1";
            // 
            // GroupBox1
            // 
            this.GroupBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left) 
                | System.Windows.Forms.AnchorStyles.Right);
            this.GroupBox1.Location = new System.Drawing.Point(0, 240);
            this.GroupBox1.Name = "GroupBox1";
            this.GroupBox1.Size = new System.Drawing.Size(292, 4);
            this.GroupBox1.TabIndex = 2;
            this.GroupBox1.TabStop = false;
            this.GroupBox1.Text = "GroupBox1";
            // 
            // MenuTextProviderHost
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.GroupBox1,
                                                                          this.menuTextProvider1});
            this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
            this.Menu = this.mnuMain;
            this.Name = "MenuTextProviderHost";
            this.Text = "MenuTextProviderHost";
            this.Load += new System.EventHandler(this.MenuTextProviderHost_Load);
            this.ResumeLayout(false);

        }
        #endregion

        private void MenuTextProviderHost_Load(object sender, System.EventArgs e)
        {
            menuTextProvider1.SetHelpText(mnuNew, " Create a new document and abandon the current one.");
        }

        static void Main() 
        {
            Application.Run(new MenuTextProviderHost());
        }
    }
    [ProvideProperty("HelpText", typeof(string))]
    public class MenuTextProvider : StatusBar, IExtenderProvider
    {
        public bool CanExtend(object extendee)
        {
            if (extendee.GetType() == typeof(MenuItem))
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        private Hashtable helpText = new Hashtable();

        public void SetHelpText(object extendee, string value)
        {
            // Specifying an empty value removes the extension.
            if (value == "")
            {
                helpText.Remove(extendee);
                MenuItem mnu = (MenuItem)extendee;
                mnu.Select -= new EventHandler(MenuSelect);
            }
            else
            {
                helpText[extendee] = value;
                MenuItem mnu = (MenuItem)extendee;
                mnu.Select += new EventHandler(MenuSelect);
            }
        }

        public string GetHelpText(object extendee)
        {
            if (helpText[extendee] != null)
            {
                return helpText[extendee].ToString();
            }
            else
            {
                return string.Empty;
            }
            }

            private void MenuSelect(object sender, System.EventArgs e)
            {
                this.Text = helpText[sender].ToString();
            }

    }




}