/*
 * ECatalog is a database front-end, with two main features:
 * 1. Use of preferences
 *  A preference-based approach, where the user is allowed to define the importance of each criterion.
 *  Then the items are ranked accordingly to his criteria.
 * 2. Trade-off analysis
 *  A cooperative database approach, where the system "argues" with the user about his criteria.
 *  When there are no matching items, the system explains the minimal conflicting set and
 *  give some possible strong and weak relaxations about his criteria.
 * This package also containts the software and the set-up details used for our User Study,
 * comparing the use or not of the two previous features mentioned above.
 *
 * Copyright (C) 2006 David Portabella Clotet, Artificial Intelligence Laboratory, EPFL
 * 
 * This file is part of ecatalog-1.0.zip
 * 
 * ECatalog is free software and a free user study set-up;
 * 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.
 * 
 * ECatalog 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 ECatalog; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * @version 1.0
 * @author David Portabella
 * To contact the author:
 * email: david@portabella.name and david.portabella@epfl.ch
 * 
 * More information about ECatalog:
 *  http://sourceforge.net/projects/ecatalog/
 *  http://icwww.epfl.ch/~portabel/ecatalogs/
 */

package utils;

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

/* A panel with JToggleButtons arranged horizontaly */
public class ButtonGroupPanel extends JPanel {
    LinkedList<ButtonGroupPanelListener> dl = new LinkedList<ButtonGroupPanelListener>();
    JToggleButton[] buttons;

    public ButtonGroupPanel(JToggleButton[] buttons){
	this.buttons = buttons;
	setLayout(new GridBagLayout());
	GridBagConstraints c = new GridBagConstraints();
	c.gridx = GridBagConstraints.RELATIVE;
	c.gridy = 0;
	c.fill = GridBagConstraints.NONE;

	ButtonGroup group = new ButtonGroup();
	for (int i = 0; i < buttons.length; i++) {
	    final int thisIndex = i;
	    buttons[i].addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { selected(thisIndex); }});
	    group.add(buttons[i]);
	    add(buttons[i],c);
	}
    }
	
    /* select the button index "index" */
    public void select(int index) {
	buttons[index].setSelected(true);
    }
	
    public void setEnabled(boolean enabled) {
	for (JToggleButton button : buttons)
	    button.setEnabled(enabled);
    }

    public boolean isEnabled(){
	//buttons[0] is arbitrary : I consider that all the buttons have the same state
	return buttons[0].isEnabled();
    }

    /* The selected button has changed. Notify to all the registered listeners */
    void selected(int index) {
	for (ButtonGroupPanelListener l : dl)
	    l.selected(index);
    }

    /* Add a listener */
    public void addButtonGroupPanelListener(ButtonGroupPanelListener l) { dl.add(l); }

    /* Remove a listener */
    public void removeButtonGroupPanelListener(ButtonGroupPanelListener l) {dl.remove(l); }
}