MenuItem.OnSelect : MenuItem « System.Windows.Forms « C# / C Sharp by API

1. C# / C Sharp by API
2. System.Windows.Forms
3. MenuItem

MenuItem.OnSelect

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class MenuItemHelp: MenuItem
{
     StatusBarPanel sbpHelpPanel;
     string         strHelpText;

     public MenuItemHelp(string strText): base(strText)
     {
     }
     public StatusBarPanel HelpPanel
     {
          get { return sbpHelpPanel; }
          set { sbpHelpPanel = value; }
     }
     public string HelpText
     {
          get { return strHelpText; }
          set { strHelpText = value; }
     }
     protected override void OnSelect(EventArgs ea)
     {
          base.OnSelect(ea);
   
          if (HelpPanel != null)
               HelpPanel.Text = HelpText;
     }
}


class MenuHelpSubclass: Form
{
     StatusBarPanel sbpMenuHelp;
     string         strSavePanelText;
   
     public static void Main()
     {
          Application.Run(new MenuHelpSubclass());
     }
     public MenuHelpSubclass()
     {

          StatusBar sb = new StatusBar();
          sb.Parent = this;
          sb.ShowPanels = true;
   
          sbpMenuHelp = new StatusBarPanel();
          sbpMenuHelp.Text = "Ready";
          sbpMenuHelp.AutoSize = StatusBarPanelAutoSize.Spring;
   
          sb.Panels.Add(sbpMenuHelp);
   
          Menu = new MainMenu();
          
          MenuItemHelp mi = new MenuItemHelp("&File");
          mi.HelpPanel = sbpMenuHelp;
          mi.HelpText = "Commands for working with files";
          Menu.MenuItems.Add(mi);
   
          mi = new MenuItemHelp("&Open...");
          mi.HelpPanel = sbpMenuHelp;
          mi.HelpText = "Opens an existing document";
          Menu.MenuItems[0].MenuItems.Add(mi);
          
          mi = new MenuItemHelp("&Close");
          mi.HelpPanel = sbpMenuHelp;
          mi.HelpText = "Closes the current document";
          Menu.MenuItems[0].MenuItems.Add(mi);
   
          mi = new MenuItemHelp("&Save");
          mi.HelpPanel = sbpMenuHelp;
          mi.HelpText = "Saves the current document";
          Menu.MenuItems[0].MenuItems.Add(mi);
   
          mi = new MenuItemHelp("&Edit");
          mi.HelpPanel = sbpMenuHelp;
          mi.HelpText = "Commands for editing the document";
          Menu.MenuItems.Add(mi);
   
          mi = new MenuItemHelp("Cu&t");
          mi.HelpPanel = sbpMenuHelp;
          mi.HelpText = "Deletes the selection and " +
                        "copies it to the clipboard";
          Menu.MenuItems[1].MenuItems.Add(mi);
          
          mi = new MenuItemHelp("&Copy");
          mi.HelpPanel = sbpMenuHelp;
          mi.HelpText = "Copies the selection to the clipboard";
          Menu.MenuItems[1].MenuItems.Add(mi);
   
          mi = new MenuItemHelp("&Paste");
          mi.HelpPanel = sbpMenuHelp;
          mi.HelpText = "Replaces the current selection " +
                        "with the clipboard contents";
          Menu.MenuItems[1].MenuItems.Add(mi);
     }
     protected override void OnMenuStart(EventArgs ea)
     {
          strSavePanelText = sbpMenuHelp.Text;
     }
     protected override void OnMenuComplete(EventArgs ea)
     {
          sbpMenuHelp.Text = strSavePanelText;
     }
}

   
  

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