TMainMenu 类[三] 手动建立菜单(6) : 更换菜单

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Menus, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

var
  MyMenu1,MyMenu2: TMainMenu;
  Item: TMenuItem;


procedure TForm1.FormCreate(Sender: TObject);
begin
  {建立第一个菜单}
  MyMenu1 := TMainMenu.Create(Self);
  MyMenu1.AutoHotkeys := maManual;

  Item := TMenuItem.Create(MyMenu1);
  Item.Caption := 'AA';
  MyMenu1.Items.Add(Item);

  Item := TMenuItem.Create(MyMenu1);
  Item.Caption := 'BB';
  MyMenu1.Items.Add(Item);

  Item := TMenuItem.Create(MyMenu1);
  Item.Caption := 'CC';
  MyMenu1.Items.Add(Item);


  {建立第二个菜单}
  MyMenu2 := TMainMenu.Create(Self);
  MyMenu2.AutoHotkeys := maManual;

  Item := TMenuItem.Create(MyMenu2);
  Item.Caption := 'XX';
  MyMenu2.Items.Add(Item);

  Item := TMenuItem.Create(MyMenu2);
  Item.Caption := 'YY';
  MyMenu2.Items.Add(Item);

  Item := TMenuItem.Create(MyMenu2);
  Item.Caption := 'ZZ';
  MyMenu2.Items.Add(Item);


  Self.Menu := nil; {当前 Form 没有指向任何一个菜单}
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  Self.Menu := MyMenu1; {指向第一个菜单}
end;


procedure TForm1.Button2Click(Sender: TObject);
begin
  Self.Menu := MyMenu2; {指向第二个菜单}
end;

end.

效果图:

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