echopointng.model.DefaultExpansionModel Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of ibis-echo2 Show documentation
Echo2 bundled with Echo2_Extras, Echo2_FileTransfer and echopointing and various improvements/bugfixes
There is a newer version: 2.0.4
package echopointng.model;

/* 
 * This file is part of the Echo Point Project.  This project is a collection
 * of Components that have extended the Echo Web Application Framework.
 *
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 */

import java.io.Serializable;
import java.util.EventListener;

import nextapp.echo2.app.event.ChangeEvent;
import nextapp.echo2.app.event.ChangeListener;
import nextapp.echo2.app.event.EventListenerList;
/**
 * A generic implementation of ExpansionModel.
 *
 */
public class DefaultExpansionModel implements ExpansionModel, Serializable {

	/**
	 * Only one ChangeEvent is needed per model instance since the
	 * event's only (read-only) state is the source property.  The source
	 * of events generated here is always "this".
	 */
	protected transient ChangeEvent changeEvent;

	protected boolean isExpanded;

	protected EventListenerList listenerList = new EventListenerList();
	
	/**
	 * An ExpansionModel that is not expanded 
	 */
	public DefaultExpansionModel() {
		this.isExpanded = false;
	}
	
	/**
	 * An ExpansionModel that is set to 'isExpanded'. 
	 */
	public DefaultExpansionModel(boolean isExpanded) {
		this.isExpanded = isExpanded;
	}
	/**
	 * Adds a ChangeListener to the button.
	 *
	 * @param l The ChangeListener to be added.
	 */
	public void addChangeListener(ChangeListener l) {
		listenerList.addListener(ChangeListener.class, l);
	}
	/**
	 * Notifies all listeners that have registered for this event type.
	 */
	public void fireStateChanged() {
		EventListener[] listeners = listenerList.getListeners(ChangeListener.class);
		if (changeEvent == null) {
			changeEvent = new ChangeEvent(this);
		}
		for (int index = 0; index < listeners.length; ++index) {
			ChangeListener listener = (ChangeListener) listeners[index];
			if (listener != null ) 
				listener.stateChanged(changeEvent);
		}
	}
	/**
	 * Returns the model's expansion.
	 *
	 */
	public boolean isExpanded() {
		return isExpanded;
	}
	/**
	 * Removes a ChangeListener from the button.
	 *
	 * @param l The ChangeListener to be removed.
	 */
	public void removeChangeListener(ChangeListener l) {
		listenerList.removeListener(ChangeListener.class, l);
	}
	/**
	 * Sets the model's expansion
	 * 

	 * Notifies any listeners if the model changes
	 * 

	 */
	public void setExpanded(boolean isExpanded) {
		if (this.isExpanded != isExpanded) {
			this.isExpanded = isExpanded;
			fireStateChanged();
		}
	}
}