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1 /*******************************************************************************
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2 * Copyright (c) 2006, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Brad Reynolds - bug 116920
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11 * Matthew Hall - bugs 215531, 226765
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12 *******************************************************************************/
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13 module org.eclipse.jface.databinding.viewers.ObservableSetContentProvider;
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14
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15 import java.lang.all;
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16
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17 import java.util.Set;
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18
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19 import org.eclipse.core.databinding.observable.IObservableCollection;
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20 import org.eclipse.core.databinding.observable.set.IObservableSet;
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21 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
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22 import org.eclipse.core.databinding.observable.set.SetChangeEvent;
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23 import org.eclipse.core.runtime.Assert;
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24 import org.eclipse.jface.internal.databinding.viewers.ObservableCollectionContentProvider;
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25 import org.eclipse.jface.viewers.AbstractListViewer;
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26 import org.eclipse.jface.viewers.AbstractTableViewer;
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27 import org.eclipse.jface.viewers.IStructuredContentProvider;
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28 import org.eclipse.jface.viewers.Viewer;
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29
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30 /**
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31 * A {@link IStructuredContentProvider content provider} for
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32 * {@link AbstractTableViewer} or {@link AbstractListViewer} that provides
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33 * elements of an {@link IObservableSet} when set as the viewer's input. Objects
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34 * of this class listen for changes to the observable set, and will insert and
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35 * remove viewer elements to reflect observed changes.
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36 *
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37 * <p>
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38 * This class is not intended to be subclassed by clients.
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39 *
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40 * @since 1.1
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41 */
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42 public class ObservableSetContentProvider : IStructuredContentProvider {
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43 private ObservableCollectionContentProvider impl;
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44
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45 private static class Impl : ObservableCollectionContentProvider
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46 , ISetChangeListener {
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47 protected void checkInput(Object input) {
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48 Assert
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49 .isTrue(null !is cast(IObservableSet)input,
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50 "This content provider only works with input of type IObservableSet"); //$NON-NLS-1$
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51 }
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52
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53 protected void addCollectionChangeListener(
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54 IObservableCollection collection) {
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55 (cast(IObservableSet) collection).addSetChangeListener(this);
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56 }
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57
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58 protected void removeCollectionChangeListener(
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59 IObservableCollection collection) {
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60 (cast(IObservableSet) collection).removeSetChangeListener(this);
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61 }
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62
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63 public void handleSetChange(SetChangeEvent event) {
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64 if (isViewerDisposed())
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65 return;
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66
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67 Set removals = event.diff.getRemovals();
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68 viewerUpdater.remove(removals.toArray());
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69 knownElements.removeAll(removals);
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70
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71 Set additions = event.diff.getAdditions();
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72 knownElements.addAll(additions);
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73 viewerUpdater.add(additions.toArray());
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74 }
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75 }
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76
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77 /**
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78 * Constructs an ObservableSetContentProvider
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79 */
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80 public this() {
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81 impl = new Impl();
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82 }
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83
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84 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
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85 impl.inputChanged(viewer, oldInput, newInput);
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86 }
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87
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88 public Object[] getElements(Object inputElement) {
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89 return impl.getElements(inputElement);
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90 }
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91
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92 public void dispose() {
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93 impl.dispose();
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94 }
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95
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96 /**
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97 * Returns the set of elements known to this content provider. Label
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98 * providers may track this set if they need to be notified about additions
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99 * before the viewer sees the added element, and notified about removals
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100 * after the element was removed from the viewer. This is intended for use
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101 * by label providers, as it will always return the items that need labels.
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102 *
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103 * @return unmodifiable set of items that will need labels
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104 */
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105 public IObservableSet getKnownElements() {
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106 return impl.getKnownElements();
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107 }
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108 }
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