CDE/cde/programs/dtmail/MotifApp/PixmapCycler.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: PixmapCycler.C /main/3 1996/04/21 19:40:27 drk $ */
/*
 *+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.
///////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////


//////////////////////////////////////////////////////////////////
// PixmapCycler.C: Abstract class that supports a continuous cycle
//                 of pixmaps for short animation sequences.
////////////////////////////////////////////////////////////////////
#include "PixmapCycler.h"

#define INVALID -1

PixmapCycler::PixmapCycler ( int numPixmaps, Dimension w, Dimension h )
{
    _numPixmaps = numPixmaps;
    _current    = INVALID;
    _pixmapList = new Pixmap[_numPixmaps];
    _width      = w;
    _height     = h;
}

PixmapCycler::~PixmapCycler()
{
    delete []_pixmapList;
}

Pixmap PixmapCycler::next()
{
    // The first time, call the createPixmaps() function 
    // implemented by the derived class to create the pixmaps
    
    if ( _current == INVALID )
    {
	createPixmaps();
	_current = 0;    // Initialize to the first pixmap
    }
    
    // If the counter is larger than the index of the 
    // last pixmap, roll it over and restart with zero
    
    if ( _current >= _numPixmaps )
	_current = 0;
    
    // Return the current pixmap and increment the counter
    
    return _pixmapList[_current++];
}