/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.jsdt.internal.ui.dnd;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.util.TransferDragSourceListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.swt.dnd.DragSourceEvent;
public class JdtViewerDragAdapter extends DelegatingDragAdapter {
private StructuredViewer fViewer;
public JdtViewerDragAdapter(StructuredViewer viewer, TransferDragSourceListener[] listeners) {
super(listeners);
Assert.isNotNull(viewer);
fViewer= viewer;
}
public void dragStart(DragSourceEvent event) {
IStructuredSelection selection= (IStructuredSelection)fViewer.getSelection();
if (selection.isEmpty()) {
event.doit= false;
return;
}
super.dragStart(event);
}
}