| /******************************************************************************* |
| * Copyright (c) 2006, 2007 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.jface.databinding.viewers; |
| |
| import java.util.Iterator; |
| |
| import org.eclipse.core.databinding.observable.set.IObservableSet; |
| import org.eclipse.core.databinding.observable.set.ISetChangeListener; |
| import org.eclipse.core.databinding.observable.set.SetChangeEvent; |
| import org.eclipse.jface.internal.databinding.provisional.viewers.ViewerLabelProvider; |
| |
| /** |
| * @since 1.1 |
| * |
| */ |
| public abstract class ListeningLabelProvider extends ViewerLabelProvider { |
| |
| private ISetChangeListener<Object> listener = new ISetChangeListener<Object>() { |
| public void handleSetChange(SetChangeEvent<Object> event) { |
| for (Iterator<Object> it = event.diff.getAdditions().iterator(); it |
| .hasNext();) { |
| addListenerTo(it.next()); |
| } |
| for (Iterator<Object> it = event.diff.getRemovals().iterator(); it |
| .hasNext();) { |
| removeListenerFrom(it.next()); |
| } |
| } |
| }; |
| |
| private IObservableSet<Object> items; |
| |
| /** |
| * @param itemsThatNeedLabels |
| */ |
| public ListeningLabelProvider(IObservableSet<Object> itemsThatNeedLabels) { |
| this.items = itemsThatNeedLabels; |
| items.addSetChangeListener(listener); |
| for (Iterator<Object> it = items.iterator(); it.hasNext();) { |
| addListenerTo(it.next()); |
| } |
| } |
| |
| /** |
| * @param next |
| */ |
| protected abstract void removeListenerFrom(Object next); |
| |
| /** |
| * @param next |
| */ |
| protected abstract void addListenerTo(Object next); |
| |
| public void dispose() { |
| for (Iterator<Object> iter = items.iterator(); iter.hasNext();) { |
| removeListenerFrom(iter.next()); |
| } |
| items.removeSetChangeListener(listener); |
| super.dispose(); |
| } |
| } |