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Java > Open Source Codes > org > eclipse > core > databinding > observable > value > IValueChangingListener


1 /*******************************************************************************
2  * Copyright (c) 2005, 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 package org.eclipse.core.databinding.observable.value;
12
13 import org.eclipse.core.databinding.observable.IObservablesListener;
14
15 /**
16  * Listener for pre-change events for observable values.
17  *
18  * @since 1.0
19  *
20  */
21 public interface IValueChangingListener extends IObservablesListener {
22
23     /**
24      * This method is called when the value is about to change and provides an
25      * opportunity to veto the change. The given event object must only be used
26      * locally in this method because it may be reused for other change
27      * notifications. The diff object referenced by the event is immutable and
28      * may be used non-locally.
29      *
30      * @param event
31      */
32     public void handleValueChanging(ValueChangingEvent event);
33
34 }
35
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