90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*
|
|
* CDE - Common Desktop Environment
|
|
*
|
|
* Copyright (c) 1993-2012, The Open Group. All rights reserved.
|
|
*
|
|
* These libraries and programs are free software; you can
|
|
* redistribute them and/or modify them under the terms of the GNU
|
|
* Lesser General Public License as published by the Free Software
|
|
* Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
* These libraries and programs are distributed in the hope that
|
|
* they will be useful, but WITHOUT ANY WARRANTY; without even the
|
|
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
* PURPOSE. See the GNU Lesser General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with these libraries and programs; if not, write
|
|
* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
|
|
* Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
/* $XConsortium: UndoCmd.C /main/3 1995/11/06 16:02:46 rswiston $ */
|
|
/*
|
|
*+SNOTICE
|
|
*
|
|
* RESTRICTED CONFIDENTIAL INFORMATION:
|
|
*
|
|
* The information in this document is subject to special
|
|
* restrictions in a confidential disclosure agreement bertween
|
|
* HP, IBM, Sun, USL, SCO and Univel. Do not distribute this
|
|
* document outside HP, IBM, Sun, USL, SCO, or Univel wihtout
|
|
* Sun's specific written approval. This documment and all copies
|
|
* and derivative works thereof must be returned or destroyed at
|
|
* Sun's request.
|
|
*
|
|
* Copyright 1993 Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
*+ENOTICE
|
|
*/
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
// This example code is from the book:
|
|
//
|
|
// Object-Oriented Programming with C++ and OSF/Motif
|
|
// by
|
|
// Douglas Young
|
|
// Prentice Hall, 1992
|
|
// ISBN 0-13-630252-1
|
|
//
|
|
// Copyright 1991 by Prentice Hall
|
|
// All Rights Reserved
|
|
//
|
|
// Permission to use, copy, modify, and distribute this software for
|
|
// any purpose except publication and without fee is hereby granted, provided
|
|
// that the above copyright notice appear in all copies of the software.
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
//////////////////////////////////////////////////////////
|
|
// UndoCmd.C: An interface to undoing the last command
|
|
//////////////////////////////////////////////////////////
|
|
#include "UndoCmd.h"
|
|
|
|
#define NULL 0
|
|
|
|
// Declare a global object: theUndoCmd
|
|
|
|
UndoCmd *theUndoCmd = new UndoCmd ( "Undo", "Undo" );
|
|
|
|
UndoCmd::UndoCmd ( char *name, char *label ) : NoUndoCmd ( name, label, 0 )
|
|
{
|
|
// Empty
|
|
}
|
|
|
|
void UndoCmd::doit()
|
|
{
|
|
// If there is a current command, undo it
|
|
|
|
if ( _lastCmd != NULL )
|
|
{
|
|
// Undo the previous command
|
|
|
|
_lastCmd->undo();
|
|
|
|
_lastCmd = NULL; // Make sure we can't undo twice
|
|
}
|
|
}
|