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comparison org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/viewers/ObservableListContentProvider.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 * Tom Schindl<tom.schindl@bestsolution.at> - bugfix in: 214355
11 * Matthew Hall - bugs 215531, 226765
12 *******************************************************************************/
13
14 module org.eclipse.jface.databinding.viewers.ObservableListContentProvider;
15
16 import java.lang.all;
17
18 import java.util.Set;
19
20 import org.eclipse.core.databinding.observable.IObservableCollection;
21 import org.eclipse.core.databinding.observable.list.IListChangeListener;
22 import org.eclipse.core.databinding.observable.list.IObservableList;
23 import org.eclipse.core.databinding.observable.list.ListChangeEvent;
24 import org.eclipse.core.databinding.observable.list.ListDiffVisitor;
25 import org.eclipse.core.databinding.observable.set.IObservableSet;
26 import org.eclipse.core.runtime.Assert;
27 import org.eclipse.jface.internal.databinding.viewers.ObservableCollectionContentProvider;
28 import org.eclipse.jface.internal.databinding.viewers.ViewerElementSet;
29 import org.eclipse.jface.viewers.AbstractListViewer;
30 import org.eclipse.jface.viewers.AbstractTableViewer;
31 import org.eclipse.jface.viewers.IStructuredContentProvider;
32 import org.eclipse.jface.viewers.Viewer;
33
34 /**
35 * A {@link IStructuredContentProvider content provider} for
36 * {@link AbstractTableViewer} or {@link AbstractListViewer} that provides
37 * elements of an {@link IObservableList} when set as the viewer's input.
38 * Objects of this class listen for changes to the observable list, and will
39 * insert and remove viewer elements to reflect observed changes.
40 *
41 * <p>
42 * This class is not intended to be subclassed by clients.
43 *
44 * @since 1.1
45 */
46 public class ObservableListContentProvider :
47 IStructuredContentProvider {
48 private ObservableCollectionContentProvider impl;
49
50 private static class Impl : ObservableCollectionContentProvider
51 , IListChangeListener {
52 protected void checkInput(Object input) {
53 Assert
54 .isTrue(null !is cast(IObservableList)input,
55 "This content provider only works with input of type IObservableList"); //$NON-NLS-1$
56 }
57
58 protected void addCollectionChangeListener(
59 IObservableCollection collection) {
60 (cast(IObservableList) collection).addListChangeListener(this);
61 }
62
63 protected void removeCollectionChangeListener(
64 IObservableCollection collection) {
65 (cast(IObservableList) collection).removeListChangeListener(this);
66 }
67
68 public void handleListChange(ListChangeEvent event) {
69 if (isViewerDisposed())
70 return;
71 final Set removals = ViewerElementSet.withComparer(comparer);
72
73 event.diff.accept(new class() ListDiffVisitor {
74 public void handleAdd(int index, Object element) {
75 knownElements.add(element);
76 viewerUpdater.insert(element, index);
77 }
78
79 public void handleRemove(int index, Object element) {
80 viewerUpdater.remove(element, index);
81 removals.add(element);
82 }
83
84 public void handleReplace(int index, Object oldElement,
85 Object newElement) {
86 knownElements.add(newElement);
87 viewerUpdater.replace(oldElement, newElement, index);
88 removals.add(oldElement);
89 }
90
91 public void handleMove(int oldIndex, int newIndex,
92 Object element) {
93 viewerUpdater.move(element, oldIndex, newIndex);
94 }
95 });
96
97 // For each removed element, do not remove from known elements if
98 // the element is still present elsewhere in the list.
99 removals.removeAll(event.getObservableList());
100 knownElements.removeAll(removals);
101 }
102 }
103
104 /**
105 * Constructs an ObservableListContentProvider
106 */
107 public this() {
108 impl = new Impl();
109 }
110
111 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
112 impl.inputChanged(viewer, oldInput, newInput);
113 }
114
115 public Object[] getElements(Object inputElement) {
116 return impl.getElements(inputElement);
117 }
118
119 public void dispose() {
120 impl.dispose();
121 }
122
123 /**
124 * Returns the set of elements known to this content provider. Label
125 * providers may track this set if they need to be notified about additions
126 * before the viewer sees the added element, and notified about removals
127 * after the element was removed from the viewer. This is intended for use
128 * by label providers, as it will always return the items that need labels.
129 *
130 * @return readableSet of items that will need labels
131 */
132 public IObservableSet getKnownElements() {
133 return impl.getKnownElements();
134 }
135 }