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/*****************************************************************************
* Copyright (c) 2011 CEA LIST.
*
* 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.widgets.databinding;
import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.ValueDiff;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.papyrus.infra.tools.databinding.AggregatedObservable;
import org.eclipse.papyrus.infra.widgets.providers.ComboLabelProvider;
import org.eclipse.papyrus.infra.widgets.providers.UnchangedObject;
import org.eclipse.papyrus.infra.widgets.providers.UnsetObject;
/**
* An ObservableValue for a ComboViewer, with support for AggregatedObservable
*
* @author Camille Letavernier
*/
public class ComboObservableValue extends AbstractObservableValue implements ISelectionChangedListener {
/**
* The Observed ComboViewer
*/
protected ComboViewer viewer;
/**
* The current value
*/
protected Object currentValue;
/**
* If the Combo may represent more than one value,
* use an AggregatedObservable
*
* May be null
*/
protected AggregatedObservable modelProperty;
/**
*
* @param viewer
* The observed ComboViewer
* @param modelProperty
* The Model IObservable
*/
public ComboObservableValue(ComboViewer viewer, IObservableValue modelProperty) {
this.viewer = viewer;
viewer.setLabelProvider(new ComboLabelProvider(viewer.getLabelProvider()));
if (modelProperty instanceof AggregatedObservable) {
this.modelProperty = (AggregatedObservable) modelProperty;
}
viewer.addSelectionChangedListener(this);
}
@Override
public Object getValueType() {
return Object.class;
}
@Override
protected Object doGetValue() {
ISelection selection = viewer.getSelection();
if (!selection.isEmpty() && selection instanceof IStructuredSelection) {
IStructuredSelection structuredSelection = (IStructuredSelection) selection;
Object firstElement = structuredSelection.getFirstElement();
if (firstElement == UnsetObject.instance) {
return null;
}
if (firstElement == UnchangedObject.instance) {
return null;
}
return firstElement;
}
return null;
}
@Override
protected void doSetValue(Object value) {
currentValue = value;
if (modelProperty != null && modelProperty.hasDifferentValues()) {
viewer.setSelection(new StructuredSelection(UnchangedObject.instance));
} else if (value == null) {
viewer.setSelection(new StructuredSelection(UnsetObject.instance));
} else {
viewer.setSelection(new StructuredSelection(value));
}
}
@Override
public synchronized void dispose() {
viewer.removeSelectionChangedListener(this);
super.dispose();
}
@Override
public void selectionChanged(SelectionChangedEvent event) {
if (((IStructuredSelection) event.getSelection()).getFirstElement() != UnchangedObject.instance) {
final Object oldValue = currentValue;
final Object newValue = doGetValue();
currentValue = newValue;
fireValueChange(new ValueDiff() {
@Override
public Object getOldValue() {
return oldValue;
}
@Override
public Object getNewValue() {
return newValue;
}
});
}
}
}
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