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/*
* Copyright (c) 2004 - 2012 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.transfer.ui;
import org.eclipse.emf.cdo.transfer.CDOTransfer;
import org.eclipse.emf.cdo.transfer.CDOTransferElement;
import org.eclipse.emf.cdo.transfer.spi.ui.TransferUIProvider;
import org.eclipse.emf.cdo.transfer.spi.ui.TransferUIProvider.Factory;
import org.eclipse.net4j.util.container.IManagedContainer;
import org.eclipse.net4j.util.container.IPluginContainer;
import org.eclipse.net4j.util.ui.dnd.DNDDropAdapter;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.widgets.Shell;
import java.util.ArrayList;
import java.util.List;
/**
* A {@link DNDDropAdapter drop adapter} that can {@link #support(StructuredViewer) support} a {@link StructuredViewer viewer} to create and perform
* {@link CDOTransfer transfers} of the dragged elements to target {@link CDOTransferElement elements}.
*
* @author Eike Stepper
*/
public class TransferDropAdapter extends DNDDropAdapter<Object>
{
private TransferUIProvider[] uiProviders;
public TransferDropAdapter(StructuredViewer viewer)
{
super(viewer);
uiProviders = getUIProviders();
List<Transfer> transfers = new ArrayList<Transfer>();
for (int i = 0; i < uiProviders.length; i++)
{
TransferUIProvider uiProvider = uiProviders[i];
uiProvider.addSupportedTransfers(transfers);
}
setTransfers(transfers.toArray(new Transfer[transfers.size()]));
}
protected IManagedContainer getContainer()
{
return IPluginContainer.INSTANCE;
}
protected TransferUIProvider[] getUIProviders()
{
return Factory.getAll(getContainer());
}
@Override
protected boolean validateTarget(Object target, int operation)
{
CDOTransferElement targetElement = getTargetElement(target);
if (targetElement != null && targetElement.isDirectory())
{
overrideOperation(DND.DROP_COPY);
return true;
}
return false;
}
@Override
protected boolean performDrop(Object data, Object target)
{
if (data == null)
{
return false;
}
final List<CDOTransferElement> sourceElements = getSourceElements(data);
if (sourceElements == null || sourceElements.isEmpty())
{
return false;
}
final CDOTransferElement targetElement = getTargetElement(target);
if (targetElement == null || !targetElement.isDirectory())
{
return false;
}
Shell shell = getViewer().getControl().getShell();
return TransferDialog.open(shell, sourceElements, targetElement);
}
protected List<CDOTransferElement> getSourceElements(Object data)
{
for (int i = 0; i < uiProviders.length; i++)
{
TransferUIProvider uiProvider = uiProviders[i];
List<CDOTransferElement> elements = uiProvider.convertTransferData(data);
if (elements != null)
{
return elements;
}
}
return null;
}
protected CDOTransferElement getTargetElement(Object target)
{
for (int i = 0; i < uiProviders.length; i++)
{
TransferUIProvider uiProvider = uiProviders[i];
CDOTransferElement element = uiProvider.convertTransferTarget(target);
if (element != null)
{
return element;
}
}
return null;
}
public static TransferDropAdapter support(StructuredViewer viewer)
{
TransferDropAdapter dropAdapter = new TransferDropAdapter(viewer);
Transfer[] transfers = dropAdapter.getTransfers();
viewer.addDropSupport(DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_DEFAULT, transfers, dropAdapter);
return dropAdapter;
}
}
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