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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.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.papyrus.infra.tools.databinding.AggregatedObservable;
import org.eclipse.papyrus.infra.widgets.messages.Messages;
import org.eclipse.swt.custom.CLabel;
/**
* An IObservableValue to edit a CLabel (Text + Image), based on a LabelProvider
* It supports AggregatedObservable
*
* @author Camille Letavernier
*/
public class CLabelObservableValue extends AbstractObservableValue {
/**
* The observed CLabel
*/
protected CLabel label;
/**
* The current value
*/
protected Object currentValue;
/**
* The LabelProvider used to define the CLabel's text and image,
* based on the current value
*/
protected ILabelProvider labelProvider;
/**
* If the CLabel may represent more than one value,
* use an AggregatedObservable
*
* May be null
*/
protected AggregatedObservable aggregated;
/**
* Constructor
*
* @param label
* The observed CLabel
* @param modelObservable
* The Model IObservable
*/
public CLabelObservableValue(CLabel label, IObservableValue modelObservable) {
this(label, modelObservable, null);
}
/**
* Constructor
*
* @param label
* The observed CLabel
* @param modelObservable
* The Model IObservable
* @param labelProvider
* The LabelProvider used to define the CLabel's text/image from the current value
*/
public CLabelObservableValue(CLabel label, IObservableValue modelObservable, ILabelProvider labelProvider) {
this.label = label;
setLabelProvider(labelProvider);
if (modelObservable instanceof AggregatedObservable) {
this.aggregated = (AggregatedObservable) modelObservable;
}
}
/**
* @param labelProvider
* The LabelProvider used to define the CLabel's text and image,
* based on the current value
*/
public void setLabelProvider(ILabelProvider labelProvider) {
if (labelProvider != null) {
this.labelProvider = labelProvider;
} else {
this.labelProvider = new LabelProvider();
}
}
@Override
public Object getValueType() {
return Object.class;
}
@Override
protected Object doGetValue() {
return currentValue;
}
@Override
protected void doSetValue(Object value) {
this.currentValue = value;
if (null != label && !label.isDisposed()) {
if (aggregated != null && aggregated.hasDifferentValues()) {
label.setText(Messages.ReferenceDialogObservable_Unchanged);
label.setImage(null);
} else if (currentValue == null) {
label.setText(Messages.ReferenceDialog_Unset);
label.setImage(null);
} else {
label.setText(labelProvider.getText(value));
label.setImage(labelProvider.getImage(value));
}
}
}
}
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