/*
 * ColorList.java demos a GridBagLayout with ListSelectionListeners for 
/* twO buttons.
 */

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


public class ColorList extends JPanel implements ListSelectionListener{
    private JList list;
    private DefaultListModel listModel;
    private JButton SetForegr, SetBackgr, b1;

      public ColorList(){
         this.setLayout(new GridBagLayout());
         GridBagConstraints c = new GridBagConstraints();
         c.fill = GridBagConstraints.HORIZONTAL;

         SetForegr = new JButton("Left Button");
	 c.insets = new Insets(10,10,10,5);   //TLBR
         c.gridx = 1;
         c.gridwidth = 3;
         c.gridy = 1;
         this.add(SetForegr, c);

         SetBackgr = new JButton("Right Button");
	 c.insets = new Insets(10,5,10,10);
         c.gridx = 5;
         c.gridy = 1;
         this.add(SetBackgr, c);

	 // Disable buttons until a color has been selected
         SetForegr.setEnabled(false);
         SetBackgr.setEnabled(false);

         b1 = new JButton("Example Button");
         b1.setActionCommand("EX");
         b1.addActionListener(new ColorListener());
         c.insets = new Insets(10,10,10,5);
         c.gridx = 1;
         c.gridy = 3;
         this.add(b1, c);

	c.insets = new Insets(10,5,10,10);  
        listModel = new DefaultListModel();
        listModel.addElement("A");
        listModel.addElement("B");
	listModel.addElement("C");
        listModel.addElement("D");
        listModel.addElement("E");
        

        //Create the list and put it in a scroll pane.
        list = new JList(listModel);
        list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        SetForegr.setEnabled(false);
        SetBackgr.setEnabled(false);
        list.addListSelectionListener(this);
        list.setVisibleRowCount(4);
        JScrollPane listScrollPane = new JScrollPane(list);
	c.insets = new Insets(10,10,10,10);  //padding around list
        c.gridx = 6;
        c.gridy = 3;
        this.add(listScrollPane, c);

      }

    class ColorListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            //This method can be called only if
            //there's a valid selection
            //so go ahead and remove whatever's selected.
            int index = list.getSelectedIndex();
            System.out.println(index);

        }
    }

    //This method is required by ListSelectionListener.
    public void valueChanged(ListSelectionEvent e) {
        if (e.getValueIsAdjusting() == false) {

            //Selection, enable the fire button.
            SetBackgr.setEnabled(true);
            SetForegr.setEnabled(true);
        }
    }

}