把事件保存到列表，然后再取出。

动态事件赋值与加载技术

最新推荐文章于 2022-02-24 09:35:31 发布

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本文介绍如何在编程中实现动态事件赋值和加载，通过实例演示了使用StringList来存储事件回调，并展示了如何调用这些事件进行操作。

目的：实现动态事件赋值和加载

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    FList: TStringList;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  FList.AddObject('1', @Button2.OnClick);
  ShowMessage(IntToStr(Integer(@Button2.OnClick)));
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  FList := TStringList.Create;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  FList.Free;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  ShowMessage('1');
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  vClick: TNotifyEvent;
  M: TMethod;
begin
  ShowMessage(IntToStr(Integer(Pointer(FList.Objects[0]))));
  m.Code := Pointer(FList.Objects[0]);
  m.Data := Pointer($FFFF);
  vClick := TNotifyEvent(M);
  vClick(self);
end;