/*******************************************************************************
* Copyright (c) 2007 MyGWT and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Darrell Meyer <darrell@mygwt.net> - initial API and implementation
*******************************************************************************/
package net.mygwt.ui.client.viewer;
import net.mygwt.ui.client.data.ChangeEvent;
import net.mygwt.ui.client.data.ChangeListener;
import net.mygwt.ui.client.data.Model;
/**
* A <code>ContentProvider</code> implementation for <code>Models</code>.
*/
public class ModelContentProvider implements IContentProvider, ChangeListener {
/**
* monitorChanges specifies if model changes should be monitored. Default
* value is <code>true</code>.
*/
public boolean monitorChanges = true;
protected Viewer viewer;
public Object[] getElements(Object input) {
if (input instanceof Model) {
return ((Model) input).getChildren().toArray();
}
return null;
}
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
this.viewer = viewer;
if (monitorChanges) {
if (oldInput != null) {
Model m = (Model) oldInput;
m.removeChangeListener(this);
}
Model m = (Model) newInput;
m.addChangeListener(this);
}
}
public void modelChanged(ChangeEvent event) {
int type = event.type;
switch (type) {
case Model.Add: {
viewer.add(event.item);
break;
}
case Model.Insert: {
viewer.insert(event.item, event.index);
break;
}
case Model.Remove: {
viewer.remove(event.item);
break;
}
case Model.Update: {
viewer.update(event.item);
break;
}
}
}
}