| /******************************************************************************* |
| * 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.ObservableEvent; |
| |
| /** |
| * Value change event describing a change of an {@link IObservableValue} |
| * object's current value. |
| * |
| * @param <T> |
| * |
| * @since 1.0 |
| * |
| */ |
| public class ValueChangeEvent<T> extends |
| ObservableEvent<ValueChangeEvent<T>, IValueChangeListener<T>> { |
| |
| /** |
| * |
| */ |
| 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<T> diff; |
| |
| /** |
| * Always identical to <code>EventObject.source</code> but the type |
| * information is maintained. |
| */ |
| private IObservableValue<T> typedSource; |
| |
| /** |
| * Creates a new value change event. |
| * |
| * @param source |
| * the source observable value |
| * @param diff |
| * the value change |
| */ |
| public ValueChangeEvent(IObservableValue<T> source, ValueDiff<T> diff) { |
| super(source); |
| this.typedSource = source; |
| this.diff = diff; |
| } |
| |
| /** |
| * Returns the observable value from which this event originated. |
| * |
| * @return returns the observable value from which this event originated |
| */ |
| public IObservableValue<T> getObservableValue() { |
| return typedSource; |
| } |
| |
| /** |
| * @since 1.5 |
| */ |
| protected void dispatch(IValueChangeListener<T> listener) { |
| listener.handleValueChange(this); |
| } |
| |
| protected Object getListenerType() { |
| return TYPE; |
| } |
| |
| } |