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/*
* Copyright (c) 2007-2009, 2011, 2012 Eike Stepper (Loehne, 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.net4j.buddies.internal.ui.views;
import org.eclipse.net4j.buddies.common.IBuddy;
import org.eclipse.net4j.buddies.internal.ui.dnd.BuddiesTransfer;
import org.eclipse.net4j.util.ui.dnd.DNDDragListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.Transfer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
/**
* @author Eike Stepper
*/
public class BuddiesDragListener extends DNDDragListener<IBuddy[]>
{
private static final Transfer[] TRANSFERS = new Transfer[] { BuddiesTransfer.INSTANCE };
protected BuddiesDragListener(StructuredViewer viewer)
{
super(TRANSFERS, viewer);
}
@Override
protected IBuddy[] getObject(IStructuredSelection selection)
{
Collection<IBuddy> buddies = new ArrayList<IBuddy>();
for (Iterator<?> it = selection.iterator(); it.hasNext();)
{
Object element = it.next();
if (element instanceof IBuddy)
{
IBuddy buddy = (IBuddy)element;
buddies.add(buddy);
}
}
if (buddies.isEmpty())
{
return null;
}
return buddies.toArray(new IBuddy[buddies.size()]);
}
public static void support(StructuredViewer viewer)
{
viewer.addDragSupport(DND.DROP_MOVE, TRANSFERS, new BuddiesDragListener(viewer));
}
}
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