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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.ValueDiff;
import org.eclipse.papyrus.infra.tools.databinding.AggregatedObservable;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Button;
/**
* An ObservableValue for {@link Button}s with the {@link SWT.CHECK} style
* Allows the checkbox to take four states ; one for each possible combination
* of {@link Button#getSelection()} and {@link Button#getGrayed()}
*
* @author Camille Letavernier
*/
public class GrayedCheckboxObservableValue extends AbstractObservableValue implements SelectionListener {
private Button checkbox;
private Boolean currentValue;
private AggregatedObservable aggregated;
/**
* Constructor
*
* @param checkbox
* The observed checkbox
* @param aggregated
* The Observable aggregating the various observable booleans
*/
public GrayedCheckboxObservableValue(Button checkbox, AggregatedObservable aggregated) {
this.checkbox = checkbox;
this.checkbox.addSelectionListener(this);
this.aggregated = aggregated;
}
@Override
public Object getValueType() {
return Object.class; // Can be either Boolean or BooleanWithDefaultState
}
@Override
protected Boolean doGetValue() {
return checkbox.getSelection();
}
@Override
protected void doSetValue(Object value) {
if (aggregated.hasDifferentValues()) {
checkbox.setSelection(true);
checkbox.setGrayed(true);
return;
} else {
checkbox.setGrayed(false);
}
if (value instanceof Boolean) {
Boolean booleanValue = (Boolean) value;
checkbox.setSelection(booleanValue);
this.currentValue = booleanValue;
} else if (value == null) {
checkbox.setSelection(false);
}
}
@Override
public synchronized void dispose() {
checkbox.removeSelectionListener(this);
super.dispose();
}
@Override
public void widgetSelected(SelectionEvent e) {
final Boolean oldValue = currentValue;
final Boolean newValue = checkbox.getSelection();
currentValue = newValue;
checkbox.setGrayed(false);
fireValueChange(new ValueDiff() {
@Override
public Object getOldValue() {
return oldValue;
}
@Override
public Object getNewValue() {
return newValue;
}
});
}
@Override
public void widgetDefaultSelected(SelectionEvent e) {
// Nothing
}
}
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