/* MessageArea.java */

/* 
 * Copyright (C) 1996-98 Mark Boyns <boyns@sdsu.edu>
 *
 * This file is part of Muffin.
 *
 * This program 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 program 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package org.doit.muffin;

public class MessageArea extends java.awt.TextArea
{
    private int maxLines;
    private int lines;
    
    public MessageArea (int maxLines)
    {
	this.maxLines = maxLines;
	lines = 0;
    }
    
    public void append (String message)
    {
	lines++;
	if (lines > maxLines)
	{
	    String text = getText ();
	    int offset = 0;
	    offset = text.indexOf ('\n', offset);
	    offset++;
	    lines--;
	    replaceRange ("", 0, offset);
	}
	super.append (message);
    }

    public void clear ()
    {
	setText ("");
	lines = 0;
    }
}
