unit Main;
interface 
uses 
  Windows, Messages, SysUtils, Classes, Graphics, 
  Controls, Forms, Dialogs, StdCtrls;

type 
  TForm1 = class(TForm) 
    Button1: TButton; 
    Edit1: TEdit; 
    procedure Button1Click(Sender: TObject); 
    procedure FormCreate(Sender: TObject); 
  private 
    { Private declarations } 
    {Отлавливаем, сообщение о изменении разрешения экрана} 
    procedure WMDisplayChange(var message: TMessage); message WM_DISPLAYCHANGE; 
  public 
    { Public declarations } 
    W, H: integer; 
  end; 

var 
  Form1: TForm1; 

implementation 

{$R *.DFM} 

procedure TForm1.Button1Click(Sender: TObject); 
begin 
  Width := Round(Width * 1.5); 
  Height := Round(Height * 1.5); 
  ScaleBy(150, 100) 
end; 

procedure TForm1.WMDisplayChange(var message: TMessage); 
begin 
  inherited; 
  Width := Round(Width * LOWORD(message.LParam) / W); 
  Height := Round(Height * HIWORD(message.LParam) / H); 
  ScaleBy(LOWORD(message.LParam), W); 
  W := Screen.Width; 
  H := Screen.Height; 
end; 

procedure TForm1.FormCreate(Sender: TObject); 
begin 
  W := Screen.Width; 
  H := Screen.Height; 
end; 

end.