/******************************************************************************
* Copyright (c) 2014 Oracle
* 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:
* Konstantin Komissarchik - initial implementation and ongoing maintenance
******************************************************************************/
package org.eclipse.sapphire.ui.def.internal;
import org.eclipse.sapphire.DefaultValueService;
import org.eclipse.sapphire.Element;
import org.eclipse.sapphire.FilteredListener;
import org.eclipse.sapphire.Listener;
import org.eclipse.sapphire.PropertyContentEvent;
import org.eclipse.sapphire.ui.forms.MasterDetailsContentNodeDef;
import org.eclipse.sapphire.ui.forms.SectionDef;
/**
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class SectionDefLabelDefaultValueProvider extends DefaultValueService
{
private MasterDetailsContentNodeDef node;
private Listener listener;
@Override
protected void initDefaultValueService()
{
final SectionDef section = context( SectionDef.class );
if( section.parent() != null )
{
final Element parent = section.parent().element();
if( parent instanceof MasterDetailsContentNodeDef )
{
this.node = (MasterDetailsContentNodeDef) parent;
this.listener = new FilteredListener<PropertyContentEvent>()
{
@Override
protected void handleTypedEvent( final PropertyContentEvent event )
{
refresh();
}
};
this.node.getLabel().attach( this.listener );
}
}
}
@Override
protected String compute()
{
return this.node != null ? this.node.getLabel().text() : null;
}
@Override
public void dispose()
{
if( this.node != null )
{
if( ! this.node.disposed() )
{
this.node.getLabel().detach( this.listener );
}
this.node = null;
this.listener = null;
}
super.dispose();
}
}