| /******************************************************************************* |
| * Copyright (c) 2000, 2006 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 |
| * |
| * Derived from org.eclipse.search.internal.ui.ResourceTransferDragAdapter |
| *******************************************************************************/ |
| package org.eclipse.wst.common.ui.internal.search.basecode; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.eclipse.core.runtime.Assert; |
| |
| import org.eclipse.core.resources.IResource; |
| |
| import org.eclipse.swt.dnd.DragSourceAdapter; |
| import org.eclipse.swt.dnd.DragSourceEvent; |
| import org.eclipse.swt.dnd.Transfer; |
| |
| import org.eclipse.jface.util.TransferDragSourceListener; |
| import org.eclipse.jface.viewers.ISelection; |
| import org.eclipse.jface.viewers.ISelectionProvider; |
| import org.eclipse.jface.viewers.IStructuredSelection; |
| |
| import org.eclipse.ui.part.ResourceTransfer; |
| |
| /** |
| * A drag adapter that transfers the current selection as </code> |
| * IResource</code>. Only those elements in the selection are part |
| * of the transfer which can be converted into an <code>IResource |
| * </code>. |
| */ |
| public class ResourceTransferDragAdapter extends DragSourceAdapter implements TransferDragSourceListener { |
| |
| private ISelectionProvider fProvider; |
| |
| /** |
| * Creates a new ResourceTransferDragAdapter for the given selection |
| * provider. |
| * |
| * @param provider the selection provider to access the viewer's selection |
| */ |
| public ResourceTransferDragAdapter(ISelectionProvider provider) { |
| fProvider= provider; |
| Assert.isNotNull(fProvider); |
| } |
| |
| public Transfer getTransfer() { |
| return ResourceTransfer.getInstance(); |
| } |
| |
| public void dragStart(DragSourceEvent event) { |
| event.doit= convertSelection().size() > 0; |
| } |
| |
| public void dragSetData(DragSourceEvent event) { |
| List resources= convertSelection(); |
| event.data= resources.toArray(new IResource[resources.size()]); |
| } |
| |
| public void dragFinished(DragSourceEvent event) { |
| if (!event.doit) |
| return; |
| } |
| |
| private List convertSelection() { |
| ISelection s= fProvider.getSelection(); |
| if (!(s instanceof IStructuredSelection)) |
| return Collections.EMPTY_LIST; |
| IStructuredSelection selection= (IStructuredSelection) s; |
| List result= new ArrayList(selection.size()); |
| for (Iterator iter= selection.iterator(); iter.hasNext();) { |
| Object element= iter.next(); |
| if (element instanceof IResource) { |
| result.add(element); |
| } |
| } |
| return result; |
| } |
| } |