org.eclipse.jface.databinding.viewers.ViewerValueProperty Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2008, 2009 Matthew Hall 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:
* 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.Realm;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.property.value.SimpleValueProperty;
import org.eclipse.jface.databinding.swt.SWTObservables;
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}
*
*
* @since 1.3
*/
public abstract class ViewerValueProperty extends SimpleValueProperty implements
IViewerValueProperty {
public IObservableValue observe(Object source) {
if (source instanceof Viewer) {
return observe((Viewer) source);
}
return super.observe(source);
}
public IObservableValue observe(Realm realm, Object source) {
IObservableValue observable = super.observe(realm, source);
if (source instanceof Viewer)
observable = new ViewerObservableValueDecorator(observable,
(Viewer) source);
return observable;
}
public IViewerObservableValue observe(Viewer viewer) {
return (IViewerObservableValue) observe(SWTObservables.getRealm(viewer
.getControl().getDisplay()), viewer);
}
public IViewerObservableValue observeDelayed(int delay, Viewer viewer) {
return ViewersObservables.observeDelayedValue(delay, observe(viewer));
}
}