| /******************************************************************************* |
| * Copyright (c) 2006, 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; |
| import org.eclipse.core.databinding.observable.ObservableEvent; |
| |
| /** |
| * Value changing event describing a pending change of an |
| * {@link IObservableValue} object's current value. Listeners can veto the |
| * pending change by setting {@link #veto} to <code>true</code>. |
| * |
| * @since 1.0 |
| * |
| */ |
| public class ValueChangingEvent extends ObservableEvent { |
| |
| /** |
| * |
| */ |
| private static final long serialVersionUID = 2305345286999701156L; |
| |
| static final Object TYPE = new Object(); |
| |
| /** |
| * Description of the change to the source observable value. Listeners must |
| * not change this field. |
| */ |
| public ValueDiff diff; |
| |
| /** |
| * Flag for vetoing this change. Default value is <code>false</code>, can |
| * be set to <code>true</code> by listeners to veto this change. |
| */ |
| public boolean veto = false; |
| |
| /** |
| * Creates a new value changing event. |
| * |
| * @param source |
| * the source observable value |
| * @param diff |
| * the value change |
| */ |
| public ValueChangingEvent(IObservableValue source, ValueDiff diff) { |
| super(source); |
| this.diff = diff; |
| } |
| |
| /** |
| * @return the observable value from which this event originated |
| */ |
| public IObservableValue getObservableValue() { |
| return (IObservableValue) source; |
| } |
| |
| protected void dispatch(IObservablesListener listener) { |
| ((IValueChangingListener) listener).handleValueChanging(this); |
| } |
| |
| protected Object getListenerType() { |
| return TYPE; |
| } |
| |
| } |