Remove the border of a TPageControl

Problem/Question/Abstract:

How to remove the border of a TPageControl

Answer:

{TPageControlEx component
Copyright (c) 1998 Sigbjoern Revheim, Sigbjoern@mad.scientist.com
This component removes the border of the pagecontrol only if there are one ore more tabs.}

unit PageControlEx;

interface

uses
  Windows, Messages, Classes, CommCtrl, ComCtrls, Controls;

type
  TPageControlEx = class(TPageControl)
  private
    FThickFrame: Boolean;
    procedure SetThickFrame(const Value: Boolean);
  protected
    procedure WndProc(var Msg: TMessage); override;
    procedure CreateParams(var Params: TCreateParams); override;
  public
    constructor Create(AOwner: TComponent); override;
  published
    property ThickFrame: Boolean read FThickFrame write SetThickFrame default true;
  end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('Extra', [TPageControlEx]);
end;

constructor TPageControlEx.Create(AOwner: TComponent);
begin
  inherited;
  FThickFrame := True;
  {DoubleBuffered := True;}
  ParentBackground := False;
end;

procedure TPageControlEx.CreateParams(var Params: TCreateParams);
begin
  inherited;
  {BorderWidth := 0;}
  {Params.Style := Params.Style or WS_POPUP;}
  ParentBackground := False;
end;

procedure TPageControlEx.SetThickFrame(const Value: Boolean);
begin
  if FThickFrame <> Value then
  begin
    FThickFrame := Value;
    RecreateWnd;
  end;
end;

procedure TPageControlEx.WndProc(var Msg: TMessage);
begin
  inherited WndProc(Msg);
  if not FThickFrame and (Msg.Msg = TCM_ADJUSTRECT) then
    with PRect(Msg.LParam)^ do
    begin
      Left := 0;
      Right := ClientWidth;
      Top := Top - 8;
      Bottom := ClientHeight;
    end;
end;

end.