TMainMenu 类[三] - 手动建立菜单(5) : 给菜单项添加事件

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure Proc(Sender: TObject); {声明将要被调用的方法}
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

var
  MyMenu: TMainMenu;
  Item: TMenuItem;

{实现将要被调用的方法}
procedure TForm1.Proc(Sender: TObject);
begin
  if Sender is TMenuItem then
    ShowMessage(TMenuItem(Sender).Caption);
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  Itemd: TMenuItem;
begin
  MyMenu := TMainMenu.Create(Self);
  MyMenu.AutoHotkeys := maManual;
  Self.Menu := MyMenu;

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

    Itemd := TMenuItem.Create(MyMenu);
    Itemd.Caption := 'A&1';
    Itemd.OnClick := Proc; {调用方法}
    Item.Add(Itemd);

    Itemd := TMenuItem.Create(Item);
    Itemd.Caption := 'A&2';
    Itemd.OnClick := Proc; {调用方法}
    Item.Add(Itemd);
end;

end.

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效果图:

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不过, 菜单事件一般是使用 ActionList 的, 添加一个 ActionList 同时添加一个方法, 实现和上面同样的功能:

---

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    ActionList1: TActionList;
    Action1: TAction;
    procedure FormCreate(Sender: TObject);
    procedure Action1Execute(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

var
  MyMenu: TMainMenu;
  Item: TMenuItem;

procedure TForm1.Action1Execute(Sender: TObject);
begin
  if Sender is TMenuItem then
    ShowMessage(TMenuItem(Sender).Caption);
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  Itemd: TMenuItem;
begin
  MyMenu := TMainMenu.Create(Self);
  MyMenu.AutoHotkeys := maManual;
  Self.Menu := MyMenu;

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

    Itemd := TMenuItem.Create(MyMenu);
    Itemd.Caption := 'A&1';
    Itemd.OnClick := Action1Execute; {调用方法}
    Item.Add(Itemd);

    Itemd := TMenuItem.Create(Item);
    Itemd.Caption := 'A&2';
    Itemd.OnClick := Action1Execute; {调用方法}
    Item.Add(Itemd);
end;

end.