TMainMenu 类[一]

自动建立一个 SDI Application 程序, 程序包含了漂亮的菜单:

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在窗体文件内记录着菜单数据:

object MainMenu1: TMainMenu
  Images = ImageList1
  Left = 8
  Top = 152
  object File1: TMenuItem
    Caption = '&File'
    Hint = 'File related commands'
    object FileNewItem: TMenuItem
      Action = FileNew1
    end
    object FileOpenItem: TMenuItem
      Action = FileOpen1
    end
    object FileSaveItem: TMenuItem
      Action = FileSave1
    end
    object FileSaveAsItem: TMenuItem
      Action = FileSaveAs1
    end
    object N1: TMenuItem
      Caption = '-'
    end
    object FileExitItem: TMenuItem
      Action = FileExit1
    end
  end
  object Edit1: TMenuItem
    Caption = '&Edit'
    Hint = 'Edit commands'
    object CutItem: TMenuItem
      Action = EditCut1
    end
    object CopyItem: TMenuItem
      Action = EditCopy1
    end
    object PasteItem: TMenuItem
      Action = EditPaste1
    end
  end
  object Help1: TMenuItem
    Caption = '&Help'
    Hint = 'Help topics'
    object HelpAboutItem: TMenuItem
      Action = HelpAbout1
    end
  end
end

菜单是一个 TMainMenu 类型的对象; 每一个菜单项都是一个 TMenuItem 类型的对象. 单元文件中有声明:

MainMenu1     : TMainMenu;

File1         : TMenuItem;
FileNewItem   : TMenuItem;
FileOpenItem  : TMenuItem;
FileSaveItem  : TMenuItem;
FileSaveAsItem: TMenuItem;
N1            : TMenuItem;
FileExitItem  : TMenuItem;
Edit1         : TMenuItem;
CutItem       : TMenuItem;
CopyItem      : TMenuItem;
PasteItem     : TMenuItem;
Help1         : TMenuItem;
HelpAboutItem : TMenuItem;

看来学习 TMainMenu 类, 必须同时学习 TMenuItem 类; 因为菜单是由若干菜单项(TMenuItem)构成的.

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