无标题栏能调整大小的窗体

unit Unit1; 

interface 

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

type
  TForm1 = class(TForm)
  private
    { Private declarations }
  public
    { Public declarations }
    procedure CreateParams(var Params: TCreateParams); override;
  end; 

var
  Form1: TForm1; 

implementation 

{$R *.dfm} 

{ TForm1 } 

procedure TForm1.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  Params.Style := WS_THICKFRAME or WS_POPUP or WS_BORDER;
end; 

end. 

object Form1: TForm1
  Left = 223
  Top = 113
  Width = 870
  Height = 640
  Caption = 'Form1'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
end