|
78
|
1 /*******************************************************************************
|
|
|
2 * Copyright (c) 2008 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 215531)
|
|
|
10 * Matthew Hall - bug 226765
|
|
|
11 ******************************************************************************/
|
|
|
12
|
|
|
13 module org.eclipse.jface.internal.databinding.viewers.ObservableCollectionContentProvider;
|
|
85
|
14 import org.eclipse.jface.internal.databinding.viewers.ViewerUpdater;
|
|
|
15 import org.eclipse.jface.internal.databinding.viewers.TableViewerUpdater;
|
|
|
16 import org.eclipse.jface.internal.databinding.viewers.ListViewerUpdater;
|
|
|
17 import org.eclipse.jface.internal.databinding.viewers.ObservableViewerElementSet;
|
|
78
|
18
|
|
|
19 import java.lang.all;
|
|
|
20
|
|
|
21 import org.eclipse.core.databinding.observable.IObservable;
|
|
|
22 import org.eclipse.core.databinding.observable.IObservableCollection;
|
|
|
23 import org.eclipse.core.databinding.observable.Observables;
|
|
|
24 import org.eclipse.core.databinding.observable.Realm;
|
|
|
25 import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
|
|
|
26 import org.eclipse.core.databinding.observable.masterdetail.MasterDetailObservables;
|
|
|
27 import org.eclipse.core.databinding.observable.set.IObservableSet;
|
|
|
28 import org.eclipse.core.databinding.observable.value.IObservableValue;
|
|
|
29 import org.eclipse.core.databinding.observable.value.WritableValue;
|
|
|
30 import org.eclipse.core.runtime.Assert;
|
|
|
31 import org.eclipse.jface.databinding.swt.SWTObservables;
|
|
|
32 import org.eclipse.jface.viewers.AbstractListViewer;
|
|
|
33 import org.eclipse.jface.viewers.AbstractTableViewer;
|
|
|
34 import org.eclipse.jface.viewers.IElementComparer;
|
|
|
35 import org.eclipse.jface.viewers.IStructuredContentProvider;
|
|
|
36 import org.eclipse.jface.viewers.StructuredViewer;
|
|
|
37 import org.eclipse.jface.viewers.Viewer;
|
|
|
38 import org.eclipse.swt.widgets.Display;
|
|
|
39
|
|
|
40 /**
|
|
|
41 * NON-API - Abstract base class for content providers where the viewer input is
|
|
|
42 * expected to be an {@link IObservableCollection}.
|
|
|
43 *
|
|
|
44 * @since 1.2
|
|
|
45 */
|
|
|
46 public abstract class ObservableCollectionContentProvider :
|
|
|
47 IStructuredContentProvider {
|
|
|
48 private IObservableValue viewerObservable;
|
|
|
49
|
|
|
50 /**
|
|
|
51 * Element comparer used by the viewer (may be null).
|
|
|
52 */
|
|
|
53 protected IElementComparer comparer;
|
|
|
54
|
|
|
55 /**
|
|
|
56 * Interface for sending updates to the viewer.
|
|
|
57 */
|
|
|
58 protected ViewerUpdater viewerUpdater;
|
|
|
59
|
|
|
60 /**
|
|
|
61 * Observable set of all elements known to the content provider. Subclasses
|
|
|
62 * must add new elements to this set <b>before</b> adding them to the
|
|
|
63 * viewer, and must remove old elements from this set <b>after</b> removing
|
|
|
64 * them from the viewer.
|
|
|
65 */
|
|
|
66 protected IObservableSet knownElements;
|
|
|
67
|
|
|
68 private IObservableSet unmodifiableKnownElements;
|
|
|
69 private IObservableCollection observableCollection;
|
|
|
70
|
|
|
71 /**
|
|
|
72 * Constructs an ObservableCollectionContentProvider
|
|
|
73 */
|
|
|
74 protected this() {
|
|
|
75 final Realm realm = SWTObservables.getRealm(Display.getDefault());
|
|
|
76 viewerObservable = new WritableValue(realm);
|
|
|
77 viewerUpdater = null;
|
|
|
78
|
|
|
79 // Known elements is a detail set of viewerObservable, so that when we
|
|
|
80 // get the viewer instance we can swap in a set that uses its
|
|
|
81 // IElementComparer, if any.
|
|
|
82 IObservableFactory knownElementsFactory = new class() IObservableFactory {
|
|
|
83 public IObservable createObservable(Object target) {
|
|
|
84 IElementComparer comparer = null;
|
|
|
85 if (null !is cast(StructuredViewer)target)
|
|
|
86 comparer = (cast(StructuredViewer) target).getComparer();
|
|
|
87 return ObservableViewerElementSet.withComparer(realm, null,
|
|
|
88 comparer);
|
|
|
89 }
|
|
|
90 };
|
|
|
91 knownElements = MasterDetailObservables.detailSet(viewerObservable,
|
|
|
92 knownElementsFactory, null);
|
|
|
93 unmodifiableKnownElements = Observables
|
|
|
94 .unmodifiableObservableSet(knownElements);
|
|
|
95
|
|
|
96 observableCollection = null;
|
|
|
97 }
|
|
|
98
|
|
|
99 public Object[] getElements(Object inputElement) {
|
|
|
100 if (observableCollection is null)
|
|
|
101 return new Object[0];
|
|
|
102 return observableCollection.toArray();
|
|
|
103 }
|
|
|
104
|
|
|
105 public void dispose() {
|
|
|
106 if (observableCollection !is null)
|
|
|
107 removeCollectionChangeListener(observableCollection);
|
|
|
108
|
|
|
109 if (viewerObservable !is null) {
|
|
|
110 viewerObservable.setValue(null);
|
|
|
111 viewerObservable.dispose();
|
|
|
112 viewerObservable = null;
|
|
|
113 }
|
|
|
114 viewerUpdater = null;
|
|
|
115 knownElements = null;
|
|
|
116 unmodifiableKnownElements = null;
|
|
|
117 }
|
|
|
118
|
|
|
119 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
|
|
|
120 setViewer(viewer);
|
|
|
121 setInput(newInput);
|
|
|
122 }
|
|
|
123
|
|
|
124 private void setViewer(Viewer viewer) {
|
|
|
125 viewerUpdater = createViewerUpdater(viewer);
|
|
|
126 comparer = getElementComparer(viewer);
|
|
|
127 viewerObservable.setValue(viewer); // (clears knownElements)
|
|
|
128 }
|
|
|
129
|
|
|
130 private static IElementComparer getElementComparer(Viewer viewer) {
|
|
|
131 if (null !is cast(StructuredViewer)viewer)
|
|
|
132 return (cast(StructuredViewer) viewer).getComparer();
|
|
|
133 return null;
|
|
|
134 }
|
|
|
135
|
|
|
136 ViewerUpdater createViewerUpdater(Viewer viewer) {
|
|
|
137 if (null !is cast(AbstractListViewer)viewer)
|
|
|
138 return new ListViewerUpdater(cast(AbstractListViewer) viewer);
|
|
|
139 if (null !is cast(AbstractTableViewer)viewer)
|
|
|
140 return new TableViewerUpdater(cast(AbstractTableViewer) viewer);
|
|
|
141 throw new IllegalArgumentException(
|
|
|
142 "This content provider only works with AbstractTableViewer or AbstractListViewer"); //$NON-NLS-1$
|
|
|
143 }
|
|
|
144
|
|
|
145 void setInput(Object input) {
|
|
|
146 if (observableCollection !is null) {
|
|
|
147 removeCollectionChangeListener(observableCollection);
|
|
|
148 observableCollection = null;
|
|
|
149 }
|
|
|
150
|
|
|
151 if (input !is null) {
|
|
|
152 checkInput(input);
|
|
|
153 Assert.isTrue(null !is cast(IObservableCollection)input,
|
|
|
154 "Input must be an IObservableCollection"); //$NON-NLS-1$
|
|
|
155 observableCollection = cast(IObservableCollection) input;
|
|
|
156 addCollectionChangeListener(observableCollection);
|
|
|
157 knownElements.addAll(observableCollection);
|
|
|
158 }
|
|
|
159 }
|
|
|
160
|
|
|
161 /**
|
|
|
162 * Throws an exception if the input is not the correct type.
|
|
|
163 *
|
|
|
164 * @param input
|
|
|
165 * the input to check
|
|
|
166 */
|
|
|
167 protected abstract void checkInput(Object input);
|
|
|
168
|
|
|
169 /**
|
|
|
170 * Register for change event notification from the given collection.
|
|
|
171 *
|
|
|
172 * @param collection
|
|
|
173 * observable collection to listen to
|
|
|
174 */
|
|
|
175 protected abstract void addCollectionChangeListener(
|
|
|
176 IObservableCollection collection);
|
|
|
177
|
|
|
178 /**
|
|
|
179 * Deregisters from change events notification on the given collection.
|
|
|
180 *
|
|
|
181 * @param collection
|
|
|
182 * observable collection to stop listening to
|
|
|
183 */
|
|
|
184 protected abstract void removeCollectionChangeListener(
|
|
|
185 IObservableCollection collection);
|
|
|
186
|
|
|
187 /**
|
|
|
188 * Returns whether the viewer is disposed. Collection change listeners in
|
|
|
189 * subclasses should verify that the viewer is not disposed before sending
|
|
|
190 * any updates to the {@link ViewerUpdater viewer updater}.
|
|
|
191 *
|
|
|
192 * @return whether the viewer is disposed.
|
|
|
193 */
|
|
|
194 protected final bool isViewerDisposed() {
|
|
|
195 Viewer viewer = cast(Viewer) viewerObservable.getValue();
|
|
|
196 return viewer is null || viewer.getControl() is null
|
|
|
197 || viewer.getControl().isDisposed();
|
|
|
198 }
|
|
|
199
|
|
|
200 /**
|
|
|
201 * Returns the set of elements known to this content provider. Label
|
|
|
202 * providers may track this set if they need to be notified about additions
|
|
|
203 * before the viewer sees the added element, and notified about removals
|
|
|
204 * after the element was removed from the viewer. This is intended for use
|
|
|
205 * by label providers, as it will always return the items that need labels.
|
|
|
206 *
|
|
|
207 * @return unmodifiable observable set of items that will need labels
|
|
|
208 */
|
|
|
209 public IObservableSet getKnownElements() {
|
|
|
210 return unmodifiableKnownElements;
|
|
|
211 }
|
|
|
212 }
|
