unit1.pas

Delphi面向对象编程思想附书源码 好用哦！

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    FontDialog1: TFontDialog;
    btnSet: TButton;
    Memo1: TMemo;
    procedure btnSetClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure WaitAWhile;
  private
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

uses uSnapshot;

{$R *.dfm}

procedure TForm1.btnSetClick(Sender: TObject);
var
  FontSnapshot:ISnapshot;
begin
  FontSnapshot:=TSnapshot.Create(Memo1.Font);
  {这里可以填写可能会改变TFont状态的任何代码}
  if  FontDialog1.Execute then
    Memo1.Font:=FontDialog1.Font;
  Memo1.Update;
  WaitAWhile;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Memo1.Lines.Add(
    '一个模拟对象状态改变后自动恢复的例子。') ;
end;

procedure TForm1.WaitAWhile;
var i:Integer;
begin
  for i :=0  to 5000  do
  begin
    caption:='状态恢复倒计时:'+Inttostr(5000-i);
  end;
end;

end.