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1 /*******************************************************************************
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2 * Copyright (c) 2006, 2007 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 *******************************************************************************/
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11
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12 module org.eclipse.jface.databinding.viewers.ListeningLabelProvider;
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13
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14 import java.lang.all;
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15
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16 import java.util.Iterator;
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17
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18 import org.eclipse.core.databinding.observable.set.IObservableSet;
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19 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
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20 import org.eclipse.core.databinding.observable.set.SetChangeEvent;
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21 import org.eclipse.jface.internal.databinding.provisional.viewers.ViewerLabelProvider;
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22
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23 /**
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24 * @since 1.1
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25 *
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26 */
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27 public abstract class ListeningLabelProvider : ViewerLabelProvider {
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28
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29 private ISetChangeListener listener = new class() ISetChangeListener {
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30 public void handleSetChange(SetChangeEvent event) {
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31 for (Iterator it = event.diff.getAdditions().iterator(); it.hasNext();) {
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32 addListenerTo(it.next());
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33 }
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34 for (Iterator it = event.diff.getRemovals().iterator(); it.hasNext();) {
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35 removeListenerFrom(it.next());
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36 }
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37 }
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38 };
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39
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40 private IObservableSet items;
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41
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42 /**
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43 * @param itemsThatNeedLabels
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44 */
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45 public this(IObservableSet itemsThatNeedLabels) {
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46 this.items = itemsThatNeedLabels;
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47 items.addSetChangeListener(listener);
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48 for (Iterator it = items.iterator(); it.hasNext();) {
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49 addListenerTo(it.next());
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50 }
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51 }
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52
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53 /**
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54 * @param next
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55 */
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56 protected abstract void removeListenerFrom(Object next);
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57
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58 /**
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59 * @param next
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60 */
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61 protected abstract void addListenerTo(Object next);
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62
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63 public void dispose() {
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64 for (Iterator iter = items.iterator(); iter.hasNext();) {
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65 removeListenerFrom(iter.next());
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66 }
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67 items.removeSetChangeListener(listener);
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68 super.dispose();
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69 }
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70 }
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