[Lazarus] How do you remove form caption area?

[silvioprog]

2013/10/5 silvioprog <silvioprog at gmail.com>

> uses
>   unit2;
>
> procedure TForm1.Button1Click(Sender: TObject);
> begin
>   Form2 := TForm2.Create(Self);
>   Form2.ShowModal;
>   Form2.Free;
> end;
>
> ---
>
> uses
>   Windows;
>
> procedure TForm2.FormShow(Sender: TObject);
> begin
>   SetWindowLong(Handle, GWL_STYLE,
>     GetWindowLong(Handle, GWL_STYLE) and (not WS_CAPTION));
>   SetWindowPos(Handle, HWND_TOPMOST, 0, 0, 0, 0,
>     SWP_DRAWFRAME or SWP_NOMOVE or SWP_NOSIZE);
> end;
>

In mainform:

unit Unit1;

{$mode objfpc}{$H+}

interface

uses
  Windows, Forms;

type

  { TForm1 }

  TForm1 = class(TForm)
    procedure FormShow(Sender: TObject);
  private
    procedure WMNCHitTest(var Msg: TMessage); message WM_NCHITTEST;
  end;

var
  Form1: TForm1;

implementation

{$R *.lfm}

procedure TForm1.FormShow(Sender: TObject);
begin
  SetWindowLong(Handle, GWL_STYLE, WS_OVERLAPPEDWINDOW and (not
WS_CAPTION));
  SetWindowPos(Handle, HWND_TOPMOST, 0, 0, 0, 0, SWP_DRAWFRAME or
    SWP_NOMOVE or SWP_NOSIZE);
end;

procedure TForm1.WMNCHitTest(var Msg: TMessage);
begin
  inherited;
  case Msg.Result of
    HTTOP: Msg.Result := HTCLIENT;
    HTTOPLEFT: Msg.Result := HTCLIENT;
    HTTOPRIGHT: Msg.Result := HTCLIENT;
    HTBOTTOM: Msg.Result := HTCLIENT;
    HTBOTTOMLEFT: Msg.Result := HTCLIENT;
    HTBOTTOMRIGHT: Msg.Result := HTCLIENT;
    HTLEFT: Msg.Result := HTCLIENT;
    HTRIGHT: Msg.Result := HTCLIENT;
  end;
end;

end.

-- 
Silvio Clécio
My public projects - github.com/silvioprog
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