Таскаем форму за её поверхность

unit DragMain;
 
interface
 
uses
  SysUtils, WinTypes, WinProcs,  Messages,
  Classes, Graphics, Controls, Forms, Dialogs, StdCrtls;
 
type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure ButtonClick(Sender: TObject);
  private       
    procedure WMNCHitTest(var M: TWMNCHitTest);
                 message wm_NCCHitTest;
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.DFM}
 
procedure TForm1. WMNCHitTest(var M: TWMNCHitTest); 
 
begin
  inherited;
  if M.Result = htClient then
    M.Result := htCaption;
end;
 
 
procedure TForm1.Button1Click(Sender: TObject);
 
begin
  Close;
end;
 
end.