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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.net4j.util.ui.dnd;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.ViewerDropAdapter;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.dnd.TransferData;
/**
* @author Eike Stepper
*/
public abstract class DNDDropAdapter<TYPE> extends ViewerDropAdapter
{
private Transfer[] transfers;
/**
* Specifies if dropping between two viewer elements is allowed.
*/
private boolean dropBetweenEnabled;
/**
* @since 3.0
*/
protected DNDDropAdapter(Transfer[] transfers, StructuredViewer viewer)
{
super(viewer);
this.transfers = transfers;
}
/**
* @since 3.0
*/
public Transfer[] getTransfers()
{
return transfers;
}
@Override
public StructuredViewer getViewer()
{
return (StructuredViewer)super.getViewer();
}
public boolean isDropBetweenEnabled()
{
return dropBetweenEnabled;
}
public void setDropBetweenEnabled(boolean dropBetweenEnabled)
{
this.dropBetweenEnabled = dropBetweenEnabled;
}
@Override
protected int determineLocation(DropTargetEvent event)
{
int location = super.determineLocation(event);
if (location == LOCATION_BEFORE || location == LOCATION_AFTER)
{
if (!dropBetweenEnabled)
{
location = LOCATION_ON;
}
}
return location;
}
@SuppressWarnings("unchecked")
@Override
public boolean performDrop(Object data)
{
Object target = getCurrentTarget();
if (target == null)
{
target = getViewer().getInput();
}
return performDrop((TYPE)data, target);
}
@Override
public boolean validateDrop(Object target, int operation, TransferData type)
{
if (target != null && !validateTarget(target, operation))
{
return false;
}
for (Transfer transfer : transfers)
{
if (transfer.isSupportedType(type))
{
return true;
}
}
return false;
}
protected abstract boolean validateTarget(Object target, int operation);
protected abstract boolean performDrop(TYPE data, Object target);
}
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