/******************************************************************************
* 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.internal;
import org.eclipse.sapphire.FilteredListener;
import org.eclipse.sapphire.Listener;
import org.eclipse.sapphire.LocalizableText;
import org.eclipse.sapphire.Property;
import org.eclipse.sapphire.PropertyEnablementEvent;
import org.eclipse.sapphire.Text;
import org.eclipse.sapphire.modeling.el.Function;
import org.eclipse.sapphire.modeling.el.FunctionContext;
import org.eclipse.sapphire.modeling.el.FunctionException;
import org.eclipse.sapphire.modeling.el.FunctionResult;
import org.eclipse.sapphire.ui.PartFunctionContext;
import org.eclipse.sapphire.ui.SapphirePart;
import org.eclipse.sapphire.ui.forms.PropertyEditorPart;
/**
* Determines if the property associated with the property editor is enabled. Can only be used in the
* context of a property editor.
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class PropertyEditorEnabledFunction extends Function
{
@Text( "Context property editor not found." )
private static LocalizableText contextPropertyEditorNotFound;
static
{
LocalizableText.init( PropertyEditorEnabledFunction.class );
}
@Override
public String name()
{
return "Enabled";
}
@Override
public FunctionResult evaluate( final FunctionContext context )
{
if( context instanceof PartFunctionContext )
{
final PartFunctionContext fc = (PartFunctionContext) context;
final SapphirePart part = fc.part();
if( part instanceof PropertyEditorPart )
{
final Property property = ( (PropertyEditorPart) part ).property();
return new FunctionResult( this, fc )
{
private Listener listener;
@Override
protected void init()
{
this.listener = new FilteredListener<PropertyEnablementEvent>()
{
@Override
protected void handleTypedEvent( final PropertyEnablementEvent event )
{
refresh();
}
};
property.attach( this.listener );
}
@Override
protected Object evaluate()
{
return property.enabled();
}
@Override
public void dispose()
{
super.dispose();
property.detach( this.listener );
this.listener = null;
}
};
}
}
throw new FunctionException( contextPropertyEditorNotFound.text() );
}
}