/*******************************************************************************
* Copyright (c) 2002, 2012 Innoopract Informationssysteme GmbH 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:
* Innoopract Informationssysteme GmbH - initial API and implementation
* EclipseSource - ongoing development
******************************************************************************/
package org.eclipse.rap.demo.controls;
import java.util.EventListener;
import java.util.EventObject;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.rap.rwt.SingletonUtil;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Shell;
final class DefaultButtonManager {
static final class ChangeEvent extends EventObject {
private static final long serialVersionUID = 1L;
public ChangeEvent( final Shell source ) {
super( source );
}
}
static interface ChangeListener extends EventListener {
void defaultButtonChanged( ChangeEvent event );
}
static DefaultButtonManager getInstance() {
return SingletonUtil.getSessionInstance( DefaultButtonManager.class );
}
private final Set<ChangeListener> changeListeners = new HashSet<ChangeListener>();
private DefaultButtonManager() {
// prevent instantiation from outside
}
void change( final Shell shell, final Button defaultButton ) {
shell.setDefaultButton( defaultButton );
if( changeListeners.size() > 0 ) {
ChangeListener[] listeners = new ChangeListener[ changeListeners.size() ];
changeListeners.toArray( listeners );
ChangeEvent event = new ChangeEvent( shell );
for( int i = 0; i < listeners.length; i++ ) {
listeners[ i ].defaultButtonChanged( event );
}
}
}
void addChangeListener( final ChangeListener listener ) {
changeListeners.add( listener );
}
void removeChangeListener( final ChangeListener listener ) {
changeListeners.remove( listener );
}
}