/******************************************************************************
* 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.samples.gallery.internal;
import org.eclipse.sapphire.DisposeEvent;
import org.eclipse.sapphire.Element;
import org.eclipse.sapphire.FilteredListener;
import org.eclipse.sapphire.Listener;
import org.eclipse.sapphire.PropertyContentEvent;
import org.eclipse.sapphire.Value;
import org.eclipse.sapphire.ui.Presentation;
import org.eclipse.sapphire.ui.SapphireAction;
import org.eclipse.sapphire.ui.def.ActionHandlerDef;
import org.eclipse.sapphire.ui.forms.PropertyEditorActionHandler;
/**
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class PrefixActionHandlerForValue extends PropertyEditorActionHandler
{
private String prefix;
@Override
public void init( final SapphireAction action,
final ActionHandlerDef def )
{
super.init( action, def );
this.prefix = def.getParam( "prefix" ) + " ";
final Element element = getModelElement();
final Listener listener = new FilteredListener<PropertyContentEvent>()
{
@Override
protected void handleTypedEvent( final PropertyContentEvent event )
{
refreshEnabledState();
refreshCheckedState();
}
};
final String path = property().name();
element.attach( listener, path );
refreshEnabledState();
refreshCheckedState();
attach
(
new FilteredListener<DisposeEvent>()
{
@Override
protected void handleTypedEvent( final DisposeEvent event )
{
element.detach( listener, path );
}
}
);
}
@Override
protected Object run( final Presentation context )
{
final String oldValue = ( (Value<?>) property() ).text();
final String newValue;
if( isChecked() )
{
newValue = this.prefix + oldValue;
}
else
{
if( oldValue.startsWith( this.prefix ) )
{
if( oldValue.length() == this.prefix.length() )
{
newValue = null;
}
else
{
newValue = oldValue.substring( this.prefix.length() );
}
}
else
{
newValue = oldValue;
}
}
( (Value<?>) property() ).write( newValue );
return null;
}
private void refreshEnabledState()
{
final String value = ( (Value<?>) property() ).text();
setEnabled( value != null );
}
private void refreshCheckedState()
{
final String value = ( (Value<?>) property() ).text();
setChecked( value != null && value.startsWith( this.prefix ) );
}
}