ActionFocusSupport.java

/* ActionFocusSupport.java created 2007-11-17
 *
 */

package org.signalml.app.action.selector;

import javax.swing.event.EventListenerList;

/** ActionFocusSupport
 *
 *
 * @author Michal Dobaczewski © 2007-2008 CC Otwarte Systemy Komputerowe Sp. z o.o.
 */
public class ActionFocusSupport {

	private Object source;

	private EventListenerList listenerList = new EventListenerList();

	public ActionFocusSupport(Object source) {
		if (source == null) {
			throw new NullPointerException("No source");
		}
		this.source = source;
	}

	public void addActionFocusListener(ActionFocusListener listener) {
		listenerList.add(ActionFocusListener.class, listener);
	}

	public void removeActionFocusListener(ActionFocusListener listener) {
		listenerList.remove(ActionFocusListener.class, listener);
	}

	public void fireActionFocusChanged() {
		Object[] listeners = listenerList.getListenerList();
		ActionFocusEvent e = null;
		for (int i = listeners.length-2; i>=0; i-=2) {
			if (listeners[i]==ActionFocusListener.class) {
				if (e == null) {
					e = new ActionFocusEvent(source);
				}
				((ActionFocusListener)listeners[i+1]).actionFocusChanged(e);
			}
		}
	}
}