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/*
* Copyright (c) 2013 Eike Stepper (Berlin, Germany) 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.internal.ui.dnd;
import org.eclipse.emf.cdo.common.branch.CDOBranchPoint;
import org.eclipse.emf.cdo.transaction.CDOMerger;
import org.eclipse.emf.cdo.transaction.CDOTransaction;
import org.eclipse.net4j.util.ui.dnd.DNDDropAdapter;
import org.eclipse.emf.spi.cdo.DefaultCDOMerger;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.Transfer;
/**
* @author Eike Stepper
*/
public class CDOMergeDropAdapter extends DNDDropAdapter<TreeSelection>
{
public static final Transfer[] TRANSFERS = new Transfer[] { org.eclipse.emf.edit.ui.dnd.LocalTransfer.getInstance() };
protected CDOMergeDropAdapter(StructuredViewer viewer)
{
super(TRANSFERS, viewer);
setExpandEnabled(false);
}
@Override
protected boolean performDrop(TreeSelection data, Object target)
{
if (target instanceof CDOTransaction)
{
for (Object obj : data.toArray())
{
if (obj instanceof CDOBranchPoint)
{
CDOBranchPoint sourceBranchPoint = (CDOBranchPoint)obj;
CDOTransaction targetTransaction = (CDOTransaction)target;
CDOMerger merger = new DefaultCDOMerger.PerFeature.ManyValued();
targetTransaction.merge(sourceBranchPoint, merger);
return true;
}
}
}
return false;
}
@Override
protected boolean validateTarget(Object target, int operation)
{
return target instanceof CDOTransaction && !((CDOTransaction)target).isDirty();
}
public static void support(StructuredViewer viewer)
{
int dndOperations = DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK;
viewer.addDropSupport(dndOperations, TRANSFERS, new CDOMergeDropAdapter(viewer));
}
}
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