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comparison org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/viewers/ListeningLabelProvider.d @ 78:0a55d2d5a946

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Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2006, 2007 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 *******************************************************************************/
11
12 module org.eclipse.jface.databinding.viewers.ListeningLabelProvider;
13
14 import java.lang.all;
15
16 import java.util.Iterator;
17
18 import org.eclipse.core.databinding.observable.set.IObservableSet;
19 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
20 import org.eclipse.core.databinding.observable.set.SetChangeEvent;
21 import org.eclipse.jface.internal.databinding.provisional.viewers.ViewerLabelProvider;
22
23 /**
24 * @since 1.1
25 *
26 */
27 public abstract class ListeningLabelProvider : ViewerLabelProvider {
28
29 private ISetChangeListener listener = new class() ISetChangeListener {
30 public void handleSetChange(SetChangeEvent event) {
31 for (Iterator it = event.diff.getAdditions().iterator(); it.hasNext();) {
32 addListenerTo(it.next());
33 }
34 for (Iterator it = event.diff.getRemovals().iterator(); it.hasNext();) {
35 removeListenerFrom(it.next());
36 }
37 }
38 };
39
40 private IObservableSet items;
41
42 /**
43 * @param itemsThatNeedLabels
44 */
45 public this(IObservableSet itemsThatNeedLabels) {
46 this.items = itemsThatNeedLabels;
47 items.addSetChangeListener(listener);
48 for (Iterator it = items.iterator(); it.hasNext();) {
49 addListenerTo(it.next());
50 }
51 }
52
53 /**
54 * @param next
55 */
56 protected abstract void removeListenerFrom(Object next);
57
58 /**
59 * @param next
60 */
61 protected abstract void addListenerTo(Object next);
62
63 public void dispose() {
64 for (Iterator iter = items.iterator(); iter.hasNext();) {
65 removeListenerFrom(iter.next());
66 }
67 items.removeSetChangeListener(listener);
68 super.dispose();
69 }
70 }