org.eclipse.jface.databinding.viewers.ViewerValueProperty Maven / Gradle / Ivy
/*******************************************************************************
* 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:
*
* - Calling {@link #observe(Object)} should create the observable on the
* display realm of the viewer's control, rather than the current default realm
*
- All
observe() methods should return an
* {@link IViewerObservableValue}
*
*
* @param type of the source object
* @param type of the value of the property
*
* @since 1.3
*/
public abstract class ViewerValueProperty extends SimpleValueProperty
implements IViewerValueProperty {
@Override
public IObservableValue observe(S source) {
if (source instanceof Viewer) {
return observe((Viewer) source);
}
return super.observe(source);
}
@Override
public IObservableValue observe(Realm realm, S source) {
IObservableValue observable = super.observe(realm, source);
if (source instanceof Viewer)
observable = new ViewerObservableValueDecorator<>(observable, (Viewer) source);
return observable;
}
@SuppressWarnings("unchecked")
@Override
public IViewerObservableValue observe(Viewer viewer) {
return (IViewerObservableValue) observe(DisplayRealm.getRealm(viewer.getControl().getDisplay()), (S) viewer);
}
@Override
public IViewerObservableValue observeDelayed(int delay, Viewer viewer) {
IViewerObservableValue observable = observe(viewer);
return new ViewerObservableValueDecorator<>(Observables.observeDelayedValue(delay, observable), viewer);
}
}