import java.awt.event.*;

import javax.swing.*;

/*

* Add an Action to a JList that can be invoked either by using

* the keyboard or a mouse.

*

* By default the Enter key will will be used to invoke the Action

* from the keyboard although you can specify and KeyStroke you wish.

*

* A double click with the mouse will invoke the same Action.

*

* The Action can be reset at any time.

*/

public class ListAction implements MouseListener

{

private static final KeyStroke ENTER = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0);

private JList list;

private KeyStroke keyStroke;

/*

* Add an Action to the JList bound by the default KeyStroke

*/

public ListAction(JList list, Action action)

{

this(list, action, ENTER);

}

/*

* Add an Action to the JList bound by the specified KeyStroke

*/

public ListAction(JList list, Action action, KeyStroke keyStroke)

{

this.list = list;

this.keyStroke = keyStroke;

// Add the KeyStroke to the InputMap

InputMap im = list.getInputMap();

im.put(keyStroke, keyStroke);

// Add the Action to the ActionMap

setAction( action );

// Handle mouse double click

list.addMouseListener( this );

}

/*

* Add the Action to the ActionMap

*/

public void setAction(Action action)

{

list.getActionMap().put(keyStroke, action);

}

// Implement MouseListener interface

public void mouseClicked(MouseEvent e)

{

if (e.getClickCount() == 2)

{

Action action = list.getActionMap().get(keyStroke);

if (action != null)

{

ActionEvent event = new ActionEvent(

list,

ActionEvent.ACTION_PERFORMED,

"");

action.actionPerformed(event);

}

}

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

}