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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/ProxyObservableList.d @ 95:6208d4f6a277

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Added trees for databinding.beans and observable
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 10:55:51 +0200
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children b74ac5dfcc06
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1 /*******************************************************************************
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2 * Copyright (c) 2007 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 208332)
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10 * IBM Corporation - initial API and implementation
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11 * (through ProxyObservableSet.java)
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12 ******************************************************************************/
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13
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14 package org.eclipse.core.internal.databinding.observable;
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15
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16 import org.eclipse.core.databinding.observable.IStaleListener;
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17 import org.eclipse.core.databinding.observable.StaleEvent;
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18 import org.eclipse.core.databinding.observable.list.*;
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19
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20 /**
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21 * Wraps an observable list. This object acts like an exact copy of the original
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22 * list, and tracks all the changes in the original. The only difference is that
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23 * disposing the wrapper will not dispose the original. You can use this
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24 * whenever you need to return an IObservableList from a method that expects the
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25 * caller to dispose the list, but you have an IObservableList that you don't
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26 * want disposed.
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27 *
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28 * @since 1.1
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29 */
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30 public class ProxyObservableList : ObservableList {
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31 private IListChangeListener listChangelistener = new class() IListChangeListener {
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32 public void handleListChange(ListChangeEvent event) {
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33 fireListChange(event.diff);
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34 }
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35 };
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36
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37 private IStaleListener staleListener = new class() IStaleListener {
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38 public void handleStale(StaleEvent event) {
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39 fireStale();
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40 }
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41 };
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42
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43 private IObservableList wrappedList;
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44
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45 /**
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46 * Constructs a ProxyObservableList that tracks the state of the given list.
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47 *
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48 * @param wrappedList
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49 * the list being wrapped
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50 */
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51 public this(IObservableList wrappedList) {
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52 super(wrappedList.getRealm(), wrappedList, wrappedList.getElementType());
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53 this.wrappedList = wrappedList;
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54 wrappedList.addListChangeListener(listChangelistener);
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55 wrappedList.addStaleListener(staleListener);
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56 }
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57
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58 public bool isStale() {
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59 getterCalled();
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60 return wrappedList is null ? false : wrappedList.isStale();
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61 }
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62
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63 public void dispose() {
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64 if (wrappedList !is null) {
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65 wrappedList.removeListChangeListener(listChangelistener);
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66 listChangelistener = null;
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67 wrappedList.removeStaleListener(staleListener);
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68 staleListener = null;
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69 wrappedList = null;
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70 }
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71 super.dispose();
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72 }
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73 }