Mercurial > projects > dwt2
diff org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/value/IValueChangingListener.d @ 95:6208d4f6a277
Added trees for databinding.beans and observable
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 10:55:51 +0200 |
parents | |
children | b74ac5dfcc06 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/value/IValueChangingListener.d Tue Apr 21 10:55:51 2009 +0200 @@ -0,0 +1,34 @@ +/******************************************************************************* + * Copyright (c) 2005, 2007 IBM Corporation and others. + * All rights reserved. This program and the accompanying materials + * are made available under the terms of the Eclipse Public License v1.0 + * which accompanies this distribution, and is available at + * http://www.eclipse.org/legal/epl-v10.html + * + * Contributors: + * IBM Corporation - initial API and implementation + *******************************************************************************/ +package org.eclipse.core.databinding.observable.value; + +import org.eclipse.core.databinding.observable.IObservablesListener; + +/** + * Listener for pre-change events for observable values. + * + * @since 1.0 + * + */ +public interface IValueChangingListener : IObservablesListener { + + /** + * This method is called when the value is about to change and provides an + * opportunity to veto the change. The given event object must only be used + * locally in this method because it may be reused for other change + * notifications. The diff object referenced by the event is immutable and + * may be used non-locally. + * + * @param event + */ + public void handleValueChanging(ValueChangingEvent event); + +}