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/*****************************************************************************
* Copyright (c) 2015 Christian W. Damus 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:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.properties.databinding;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.databinding.observable.IObserving;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.gef.EditPart;
import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart;
import org.eclipse.gmf.runtime.notation.CanonicalStyle;
import org.eclipse.papyrus.infra.emf.gmf.command.GMFtoEMFCommandWrapper;
import org.eclipse.papyrus.infra.gmfdiag.canonical.editpolicy.CanonicalStateListener;
import org.eclipse.papyrus.infra.gmfdiag.common.commands.SetCanonicalCommand;
import org.eclipse.papyrus.infra.gmfdiag.common.helper.NotationHelper;
import org.eclipse.papyrus.infra.gmfdiag.common.utils.DiagramEditPartsUtil;
import org.eclipse.papyrus.infra.gmfdiag.properties.modelelement.SynchronizationModelElement;
import org.eclipse.papyrus.infra.services.edit.ui.databinding.AggregatedPapyrusObservableValue;
import org.eclipse.papyrus.infra.tools.databinding.AggregatedObservable;
import org.eclipse.papyrus.infra.tools.databinding.CommandBasedObservableValue;
import org.eclipse.papyrus.infra.tools.databinding.ReferenceCountedObservable;
/**
* The observable boolean "canonical synchronization" state of an {@link EditPart}, as represented by
* a {@link SynchronizationModelElement}.
*/
public class CanonicalObservableValue extends ReferenceCountedObservable.Value implements CommandBasedObservableValue, AggregatedObservable, IObserving {
private TransactionalEditingDomain domain;
private EditPart editPart;
private boolean lastComputed;
private CanonicalStateListener canonicalStateListener;
private CanonicalStateListener.Handler refreshHandler;
public CanonicalObservableValue(TransactionalEditingDomain domain, EditPart editPart) {
super();
this.domain = domain;
this.editPart = editPart;
final Runnable update = new Runnable() {
@Override
public void run() {
boolean oldValue = lastComputed; // doGetValue updates this
fireValueChange(Diffs.createValueDiff(oldValue, doGetValue()));
}
};
if (editPart instanceof IGraphicalEditPart) {
IGraphicalEditPart graphical = (IGraphicalEditPart) editPart;
canonicalStateListener = CanonicalStateListener.getInstance(graphical);
refreshHandler = new CanonicalStateListener.Handler() {
@Override
public Runnable handleAdd(CanonicalStyle style) {
return update;
}
@Override
public Runnable handleRemove(CanonicalStyle style) {
return update;
}
};
canonicalStateListener.addCanonicalRefreshHandler(refreshHandler);
}
}
@Override
public synchronized void dispose() {
try {
if (canonicalStateListener != null) {
canonicalStateListener.removeCanonicalRefreshHandler(refreshHandler);
canonicalStateListener.release();
canonicalStateListener = null;
}
} finally {
super.dispose();
}
}
@Override
public Object getObserved() {
return editPart;
}
@Override
public Object getValueType() {
return Boolean.class;
}
@Override
protected Object doGetValue() {
boolean result = DiagramEditPartsUtil.isCanonical(editPart);
lastComputed = result;
return result;
}
@Override
protected void doSetValue(Object value) {
Command command = getCommand(value);
domain.getCommandStack().execute(command);
}
@Override
public Command getCommand(Object value) {
boolean canonical = (value instanceof Boolean) && ((Boolean) value).booleanValue();
return GMFtoEMFCommandWrapper.wrap(new SetCanonicalCommand(domain, NotationHelper.findView(editPart), canonical));
}
@Override
public AggregatedObservable aggregate(IObservable observable) {
return new AggregatedPapyrusObservableValue(domain, this, observable);
}
@Override
public boolean hasDifferentValues() {
return false; // Primitive component has only one value
}
}
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