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comparison org.eclipse.core.databinding/src/org/eclipse/core/databinding/observable/value/ValueChangingEvent.d @ 78:0a55d2d5a946

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Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2006, 2007 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 ******************************************************************************/
11
12 module org.eclipse.core.databinding.observable.value.ValueChangingEvent;
13
14 import java.lang.all;
15
16 import org.eclipse.core.databinding.observable.IObservablesListener;
17 import org.eclipse.core.databinding.observable.ObservableEvent;
18
19 /**
20 * Value changing event describing a pending change of an
21 * {@link IObservableValue} object's current value. Listeners can veto the
22 * pending change by setting {@link #veto} to <code>true</code>.
23 *
24 * @since 1.0
25 *
26 */
27 public class ValueChangingEvent : ObservableEvent {
28
29 /**
30 *
31 */
32 private static final long serialVersionUID = 2305345286999701156L;
33
34 static final Object TYPE = new Object();
35
36 /**
37 * Description of the change to the source observable value. Listeners must
38 * not change this field.
39 */
40 public ValueDiff diff;
41
42 /**
43 * Flag for vetoing this change. Default value is <code>false</code>, can
44 * be set to <code>true</code> by listeners to veto this change.
45 */
46 public bool veto = false;
47
48 /**
49 * Creates a new value changing event.
50 *
51 * @param source
52 * the source observable value
53 * @param diff
54 * the value change
55 */
56 public this(IObservableValue source, ValueDiff diff) {
57 super(source);
58 this.diff = diff;
59 }
60
61 /**
62 * @return the observable value from which this event originated
63 */
64 public IObservableValue getObservableValue() {
65 return cast(IObservableValue) source;
66 }
67
68 protected void dispatch(IObservablesListener listener) {
69 (cast(IValueChangingListener) listener).handleValueChanging(this);
70 }
71
72 protected Object getListenerType() {
73 return TYPE;
74 }
75
76 }