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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.core.databinding.observable.StaleEvent;
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81
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13 import org.eclipse.core.databinding.observable.IStaleListener;
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14 import org.eclipse.core.databinding.observable.ObservableEvent;
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15 import org.eclipse.core.databinding.observable.IObservable;
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16 import org.eclipse.core.databinding.observable.IObservablesListener;
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78
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17
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18 import java.lang.all;
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19
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20 /**
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21 * Generic event denoting that the state of an {@link IObservable} object is
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22 * about to change. Note that this event is only fired when an observable
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23 * becomes stale, not when it becomes unstale; an observable that becomes
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24 * unstale should always fire a change event. Staleness can be used (for
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25 * example) to notify listeners when an observable has started a background
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26 * thread for updating its state. Clients can safely ignore staleness.
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27 *
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28 * @see IObservable#isStale()
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29 *
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30 * @since 1.0
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31 *
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32 */
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33 public class StaleEvent : ObservableEvent {
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34
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35 /**
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36 * Creates a new stale event.
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37 *
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38 * @param source
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39 * the source observable
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40 */
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41 public this(IObservable source) {
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42 super(source);
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43 }
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44
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45 /**
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46 *
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47 */
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85
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48 private static const long serialVersionUID = 3491012225431471077L;
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49
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85
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50 static const Object TYPE;
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51 static this(){
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52 TYPE = new Object();
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53 }
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78
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54
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55 protected void dispatch(IObservablesListener listener) {
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56 (cast(IStaleListener) listener).handleStale(this);
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57 }
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58
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59 protected Object getListenerType() {
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60 return TYPE;
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61 }
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62
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63 }
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