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comparison org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/viewers/ObservableSetContentProvider.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, 2008 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 * Brad Reynolds - bug 116920
11 * Matthew Hall - bugs 215531, 226765
12 *******************************************************************************/
13 module org.eclipse.jface.databinding.viewers.ObservableSetContentProvider;
14
15 import java.lang.all;
16
17 import java.util.Set;
18
19 import org.eclipse.core.databinding.observable.IObservableCollection;
20 import org.eclipse.core.databinding.observable.set.IObservableSet;
21 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
22 import org.eclipse.core.databinding.observable.set.SetChangeEvent;
23 import org.eclipse.core.runtime.Assert;
24 import org.eclipse.jface.internal.databinding.viewers.ObservableCollectionContentProvider;
25 import org.eclipse.jface.viewers.AbstractListViewer;
26 import org.eclipse.jface.viewers.AbstractTableViewer;
27 import org.eclipse.jface.viewers.IStructuredContentProvider;
28 import org.eclipse.jface.viewers.Viewer;
29
30 /**
31 * A {@link IStructuredContentProvider content provider} for
32 * {@link AbstractTableViewer} or {@link AbstractListViewer} that provides
33 * elements of an {@link IObservableSet} when set as the viewer's input. Objects
34 * of this class listen for changes to the observable set, and will insert and
35 * remove viewer elements to reflect observed changes.
36 *
37 * <p>
38 * This class is not intended to be subclassed by clients.
39 *
40 * @since 1.1
41 */
42 public class ObservableSetContentProvider : IStructuredContentProvider {
43 private ObservableCollectionContentProvider impl;
44
45 private static class Impl : ObservableCollectionContentProvider
46 , ISetChangeListener {
47 protected void checkInput(Object input) {
48 Assert
49 .isTrue(null !is cast(IObservableSet)input,
50 "This content provider only works with input of type IObservableSet"); //$NON-NLS-1$
51 }
52
53 protected void addCollectionChangeListener(
54 IObservableCollection collection) {
55 (cast(IObservableSet) collection).addSetChangeListener(this);
56 }
57
58 protected void removeCollectionChangeListener(
59 IObservableCollection collection) {
60 (cast(IObservableSet) collection).removeSetChangeListener(this);
61 }
62
63 public void handleSetChange(SetChangeEvent event) {
64 if (isViewerDisposed())
65 return;
66
67 Set removals = event.diff.getRemovals();
68 viewerUpdater.remove(removals.toArray());
69 knownElements.removeAll(removals);
70
71 Set additions = event.diff.getAdditions();
72 knownElements.addAll(additions);
73 viewerUpdater.add(additions.toArray());
74 }
75 }
76
77 /**
78 * Constructs an ObservableSetContentProvider
79 */
80 public this() {
81 impl = new Impl();
82 }
83
84 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
85 impl.inputChanged(viewer, oldInput, newInput);
86 }
87
88 public Object[] getElements(Object inputElement) {
89 return impl.getElements(inputElement);
90 }
91
92 public void dispose() {
93 impl.dispose();
94 }
95
96 /**
97 * Returns the set of elements known to this content provider. Label
98 * providers may track this set if they need to be notified about additions
99 * before the viewer sees the added element, and notified about removals
100 * after the element was removed from the viewer. This is intended for use
101 * by label providers, as it will always return the items that need labels.
102 *
103 * @return unmodifiable set of items that will need labels
104 */
105 public IObservableSet getKnownElements() {
106 return impl.getKnownElements();
107 }
108 }