/******************************************************************************
 * Product: Compiere ERP & CRM Smart Business Solution                        *
 * Copyright (C) 1999-2007 ComPiere, Inc. All Rights Reserved.                *
 * This program is free software, you can redistribute it and/or modify it    *
 * under the terms version 2 of the GNU General Public License as published   *
 * by the Free Software Foundation. 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.,    *
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.                     *
 * For the text or an alternative of this public license, you may reach us    *
 * ComPiere, Inc., 3600 Bridge Parkway #102, Redwood City, CA 94065, USA      *
 * or via info@compiere.org or http://www.compiere.org/license.html           *
 *****************************************************************************/
package org.compiere.pos;

import java.awt.event.*;
import java.util.*;

import org.compiere.apps.*;
import org.compiere.util.*;


/**
 *	POS Keyboard Focus Manager
 *	
 *  @author Jorg Janke
 *  @version $Id: PosKeyboardFocusManager.java,v 1.1 2008/01/16 07:43:00 jrmt Exp $
 */
public class PosKeyboardFocusManager extends AKeyboardFocusManager
	implements ActionListener
{
	/**
	 * 	PosKeyboardFocusManager
	 */
	public PosKeyboardFocusManager ()
	{
		super ();
	}	//	PosKeyboardFocusManager

	/** FirstIn First Out List			*/
	private LinkedList<KeyEvent>	m_fifo = new LinkedList<KeyEvent>();
	/** Timer							*/
	private javax.swing.Timer		m_timer = null;
	/**	Logger			*/
	private static CLogger log = CLogger.getCLogger(PosKeyboardFocusManager.class);
	
	/**
	 * 	Dispose
	 */
	public void dispose()
	{
		if (m_timer != null)
			m_timer.stop();
		m_timer = null;
		if (m_fifo != null)
			m_fifo.clear();
		m_fifo = null;
	}	//	dispose

	
	/**
	 * 	Start Timer
	 */
	public void start()
	{
		//	Unqueue time - 200 ms
		int delay = 200;
		log.fine("" + delay); 
		if (m_timer == null)
			m_timer = new javax.swing.Timer (delay, this);
		if (!m_timer.isRunning())
			m_timer.start();
	}	//	start
	
	/**
	 * 	Stop Timer
	 */
	public void stop()
	{
		log.fine("" + m_timer); 
		if (m_timer != null)
			m_timer.stop();
	}	//	stop
	
	
	/**************************************************************************
	 * 	Dispatch Key Event - queue
	 *	@param event event
	 *	@return true
	 */
	public boolean dispatchKeyEvent (KeyEvent event)
	{
		if (m_timer == null)
			super.dispatchKeyEvent (event);
		else
			m_fifo.add(event);
		return true;
	}	//	displatchEvent
	
	
	/**
	 * 	Action Performed - unqueue
	 *	@param e event
	 */
	public void actionPerformed (ActionEvent e)
	{
		if (m_timer == null)
			return;
	//	log.fine( "actionPerformed - " + m_fifo.size()); 
		while (m_fifo.size() > 0)
		{
			KeyEvent event = (KeyEvent)m_fifo.removeFirst();
			super.dispatchKeyEvent (event);
		}
	}	//	actionPerformed
	
}	//	PosKeyboardFocusManager
