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1 /*******************************************************************************
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2 * Copyright (c) 2005, 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 module org.eclipse.core.databinding.observable.value.IValueChangingListener;
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81
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12 import org.eclipse.core.databinding.observable.value.ValueChangingEvent;
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78
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13
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14 import java.lang.all;
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15
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16 import org.eclipse.core.databinding.observable.IObservablesListener;
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17
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18 /**
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19 * Listener for pre-change events for observable values.
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20 *
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21 * @since 1.0
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22 *
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23 */
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24 public interface IValueChangingListener : IObservablesListener {
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25
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26 /**
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27 * This method is called when the value is about to change and provides an
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28 * opportunity to veto the change. The given event object must only be used
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29 * locally in this method because it may be reused for other change
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30 * notifications. The diff object referenced by the event is immutable and
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31 * may be used non-locally.
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32 *
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33 * @param event
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34 */
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35 public void handleValueChanging(ValueChangingEvent event);
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36
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37 }
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