UPascal Code

{
 ***************************************************************************
 *                                                                         *
 *   This source is free software; you can redistribute it and/or modify   *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This code is distributed in the hope that it will be useful, but      *
 *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
 *   General Public License for more details.                              *
 *                                                                         *
 *   A copy of the GNU General Public License is available on the World    *
 *   Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also      *
 *   obtain it by writing to the Free Software Foundation,                 *
 *   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.        *
 *                                                                         *
 ***************************************************************************
}

unit UPageControl;

{$INCLUDE upascal.inc}

interface

uses
  Classes, ComCtrls, Controls, SysUtils;

type

  CPageControl = class(TPageControl)
  protected
    procedure MouseDown(AMouseButton: TMouseButton; AShift: TShiftState;
      AX, AY: integer); override;
    function CanChange: boolean; override;
    procedure DoChange; override;
  end;

implementation

uses Windows;

function CPageControl.CanChange: boolean;
begin
  Result := inherited CanChange;
  if Result then begin
    if HasParent then begin
      SendMessage(Parent.Handle, WM_SETREDRAW, WPARAM(False), 0);
    end;
  end;
end;

procedure CPageControl.DoChange;
begin
  if HasParent then begin
    SendMessage(Parent.Handle, WM_SETREDRAW, WPARAM(True), 0);
    Invalidate;
  end;
  inherited DoChange;
end;

procedure CPageControl.MouseDown(AMouseButton: TMouseButton; AShift: TShiftState; AX, AY: integer);
begin
  if AMouseButton = mbRight then begin
    AX := IndexOfTabAt(AX, AY);
    if AX >= 0 then begin
      ActivePageIndex := AX;
    end;
  end;
  inherited MouseDown(AMouseButton, AShift, AX, AY);
end;

end.