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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.value.ValueChangingEvent;
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81
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13 import org.eclipse.core.databinding.observable.value.ValueDiff;
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14 import org.eclipse.core.databinding.observable.value.IObservableValue;
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15 import org.eclipse.core.databinding.observable.value.IValueChangingListener;
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78
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16
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17 import java.lang.all;
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18
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19 import org.eclipse.core.databinding.observable.IObservablesListener;
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20 import org.eclipse.core.databinding.observable.ObservableEvent;
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21
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22 /**
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23 * Value changing event describing a pending change of an
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24 * {@link IObservableValue} object's current value. Listeners can veto the
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25 * pending change by setting {@link #veto} to <code>true</code>.
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26 *
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27 * @since 1.0
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28 *
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29 */
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30 public class ValueChangingEvent : ObservableEvent {
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31
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32 /**
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33 *
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34 */
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35 private static final long serialVersionUID = 2305345286999701156L;
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36
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37 static final Object TYPE = new Object();
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38
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39 /**
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40 * Description of the change to the source observable value. Listeners must
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41 * not change this field.
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42 */
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43 public ValueDiff diff;
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44
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45 /**
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46 * Flag for vetoing this change. Default value is <code>false</code>, can
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47 * be set to <code>true</code> by listeners to veto this change.
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48 */
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49 public bool veto = false;
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50
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51 /**
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52 * Creates a new value changing event.
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53 *
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54 * @param source
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55 * the source observable value
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56 * @param diff
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57 * the value change
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58 */
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59 public this(IObservableValue source, ValueDiff diff) {
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60 super(source);
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61 this.diff = diff;
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62 }
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63
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64 /**
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65 * @return the observable value from which this event originated
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66 */
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67 public IObservableValue getObservableValue() {
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68 return cast(IObservableValue) source;
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69 }
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70
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71 protected void dispatch(IObservablesListener listener) {
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72 (cast(IValueChangingListener) listener).handleValueChanging(this);
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73 }
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74
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75 protected Object getListenerType() {
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76 return TYPE;
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77 }
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78
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79 }
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