| /******************************************************************************* |
| * Copyright (c) 2008, 2015 Matthew Hall and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Matthew Hall - initial API and implementation (bug 194734) |
| * Matthew Hall - bugs 263413, 264286 |
| ******************************************************************************/ |
| |
| package org.eclipse.jface.databinding.viewers; |
| |
| import org.eclipse.core.databinding.observable.Observables; |
| import org.eclipse.core.databinding.observable.Realm; |
| import org.eclipse.core.databinding.observable.value.IObservableValue; |
| import org.eclipse.core.databinding.property.value.SimpleValueProperty; |
| import org.eclipse.jface.databinding.swt.DisplayRealm; |
| import org.eclipse.jface.internal.databinding.viewers.ViewerObservableValueDecorator; |
| import org.eclipse.jface.viewers.Viewer; |
| |
| /** |
| * Abstract value property implementation for {@link Viewer} properties. This |
| * class implements some basic behavior that viewer properties are generally |
| * expected to have, namely: |
| * <ul> |
| * <li>Calling {@link #observe(Object)} should create the observable on the |
| * display realm of the viewer's control, rather than the current default realm |
| * <li>All <code>observe()</code> methods should return an |
| * {@link IViewerObservableValue} |
| * </ul> |
| * |
| * @param <S> type of the source object |
| * @param <T> type of the value of the property |
| * |
| * @since 1.3 |
| */ |
| public abstract class ViewerValueProperty<S, T> extends SimpleValueProperty<S, T> |
| implements IViewerValueProperty<S, T> { |
| @Override |
| public IObservableValue<T> observe(S source) { |
| if (source instanceof Viewer) { |
| return observe((Viewer) source); |
| } |
| return super.observe(source); |
| } |
| |
| @Override |
| public IObservableValue<T> observe(Realm realm, S source) { |
| IObservableValue<T> observable = super.observe(realm, source); |
| if (source instanceof Viewer) |
| observable = new ViewerObservableValueDecorator<>(observable, (Viewer) source); |
| return observable; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public IViewerObservableValue<T> observe(Viewer viewer) { |
| return (IViewerObservableValue<T>) observe(DisplayRealm.getRealm(viewer.getControl().getDisplay()), (S) viewer); |
| } |
| |
| @Override |
| public IViewerObservableValue<T> observeDelayed(int delay, Viewer viewer) { |
| IViewerObservableValue<T> observable = observe(viewer); |
| return new ViewerObservableValueDecorator<>(Observables.observeDelayedValue(delay, observable), viewer); |
| } |
| } |