/*
* $Id$
*
* Copyright 2009 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
package org.jdesktop.swingx.event;
import javax.swing.event.EventListenerList;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
/**
* Helper to listen to TreeExpansion events and notify with a remapped source.
*
* @author Jeanette Winzenburg
*/
public class TreeExpansionBroadcaster implements TreeExpansionListener {
private Object source;
private EventListenerList listeners;
public TreeExpansionBroadcaster(Object source) {
this.source = source;
}
public void addTreeExpansionListener(TreeExpansionListener l) {
getEventListenerList().add(TreeExpansionListener.class, l);
}
public void removeTreeExpansionListener(TreeExpansionListener l) {
if (!hasListeners())
return;
listeners.remove(TreeExpansionListener.class, l);
}
/**
* @return
*/
private EventListenerList getEventListenerList() {
if (listeners == null) {
listeners = new EventListenerList();
}
return listeners;
}
// -------------------- TreeExpansionListener
@Override
public void treeExpanded(TreeExpansionEvent event) {
if (!hasListeners())
return;
fireTreeExpanded(retarget(event));
}
@Override
public void treeCollapsed(TreeExpansionEvent event) {
if (!hasListeners())
return;
fireTreeCollapsed(retarget(event));
}
/**
* @param event
*/
private void fireTreeExpanded(TreeExpansionEvent event) {
TreeExpansionListener[] ls = listeners
.getListeners(TreeExpansionListener.class);
for (int i = ls.length - 1; i >= 0; i--) {
ls[i].treeExpanded(event);
}
}
/**
* @param event
*/
private void fireTreeCollapsed(TreeExpansionEvent event) {
TreeExpansionListener[] ls = listeners
.getListeners(TreeExpansionListener.class);
for (int i = ls.length - 1; i >= 0; i--) {
ls[i].treeCollapsed(event);
}
}
/**
* @param event
* @return
*/
private TreeExpansionEvent retarget(TreeExpansionEvent event) {
return new TreeExpansionEvent(source, event.getPath());
}
/**
* @return
*/
private boolean hasListeners() {
return listeners != null && listeners.getListenerCount() > 0;
}
}