/*
 *    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.
 */

/*
 * Created on 2005/7/27
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package eti.bi.alphaminer.jhelpcomponent;

import java.awt.Cursor;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;

import javax.swing.Icon;
import javax.swing.JButton;

import eti.bi.alphaminer.core.observer.HelpObserver;
import eti.bi.alphaminer.core.observer.HelpObserveSubject;

/**
 * @author tyleung
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class JHelpButton extends JButton implements 
MouseListener, HelpObserver {
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private boolean m_HelpState;
	private boolean m_NormalState;
	private Icon m_DefaultDisabledIcon;
	private Icon m_HelpDisabledIcon;
	
	public JHelpButton() {
	    setHelpState(false);
	    m_DefaultDisabledIcon = this.getDisabledIcon();
	    setDisabledIcon(m_DefaultDisabledIcon);
	    addMouseListener(this);
	    HelpObserveSubject.registerInterest(this);
	}
	
	public JHelpButton(Icon icon) {
	    super.setIcon(icon);
	    setHelpState(false);
	    m_DefaultDisabledIcon = this.getDisabledIcon();
	    addMouseListener(this);
	    HelpObserveSubject.registerInterest(this);
	}
	
	public void setDefaultDisabledIcon() {
	    super.setDisabledIcon(m_DefaultDisabledIcon);
	}
	
	public void setHelpDisabledIcon(Icon icon) {
	    m_HelpDisabledIcon = icon;
	}
	
	public void Update(boolean a_HelpState) {
	    setHelpMode(a_HelpState);
	}
	
	private void setHelpMode(boolean a_HelpState) {
	    HelpCursor helpCursor = new HelpCursor();
	    
	    setHelpState(a_HelpState);
	    
	    if ( a_HelpState ) {
	        getParent().setCursor(helpCursor.getCursor());
	        if ( isEnabled() ) {
	            setDisabledIcon(m_HelpDisabledIcon);
	        } else {
	            setDisabledIcon(m_DefaultDisabledIcon);
	        }
	        setNormalState(isEnabled());
	        setEnabled(false);
	    }
	    else {
	        getParent().setCursor(
	                Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
	        setDisabledIcon(m_DefaultDisabledIcon);
	        setEnabled(getNormalState());
	    }
	}
	
	private void setNormalState(boolean state) {
	    m_NormalState = state;
	}
	
	private boolean getNormalState() {
	    return m_NormalState;
	}
	
	private void setHelpState(boolean a_HelpState) {
	    m_HelpState = a_HelpState;
	}
	
	private boolean isHelpMode() {
	    return m_HelpState;
	}
	
	/**
	 * @see java.awt.event.MouseListener#mouseEntered(MouseEvent)
	 */
	public void mouseEntered(MouseEvent e) {
	}
	
	/**
	 * @see java.awt.event.MouseListener#mouseExited(MouseEvent)
	 */
	public void mouseExited(MouseEvent e) {
	}
	
	/**
	 * @see java.awt.event.MouseListener#mousePressed(MouseEvent)
	 */
	public void mousePressed(MouseEvent e) {
	    if ( isHelpMode() ) {
	        setHelpMode(false);
	        HelpObserveSubject.sendNotify(false);
	    }
	}
	
	/**
	 * @see java.awt.event.MouseListener#mouseReleased(MouseEvent)
	 */
	public void mouseReleased(MouseEvent e) {
	}
	
	/**
	 * @see java.awt.event.MouseListener#mouseClicked(MouseEvent)
	 */
	public void mouseClicked(MouseEvent e) {
	}
}