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/*******************************************************************************
* Copyright (c) 2000, 2008 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.cdt.internal.ui.dnd;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.actions.ReadOnlyStateChecker;
import org.eclipse.ui.part.ResourceTransfer;
import org.eclipse.cdt.internal.ui.CUIMessages;
/**
* 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 implements TransferDragSourceListener {
private final ISelectionProvider provider;
/**
* Creates a new ResourceTransferDragAdapter for the given selection provider.
*
* @param provider the selection provider to access the viewer's selection
*/
public ResourceTransferDragAdapter(ISelectionProvider provider) {
super();
this.provider = provider;
Assert.isNotNull(provider);
}
public Transfer getTransfer() {
return ResourceTransfer.getInstance();
}
public void dragStart(DragSourceEvent event) {
IResource[] resources = getSelectedResources();
event.doit = resources.length > 0;
}
public void dragSetData(DragSourceEvent event) {
event.data = getSelectedResources();
}
public void dragFinished(DragSourceEvent event) {
if (event.doit && event.detail == DND.DROP_MOVE) {
IResource[] resources = getSelectedResources();
if (resources.length == 0)
return;
DragSource dragSource = (DragSource) event.widget;
Control control = dragSource.getControl();
Shell shell = control.getShell();
String title = CUIMessages.getString("Drag.move.problem.title"); //$NON-NLS-1$
String message = CUIMessages.getString("Drag.move.problem.message"); //$NON-NLS-1$
ReadOnlyStateChecker checker = new ReadOnlyStateChecker(shell, title, message);
resources = checker.checkReadOnlyResources(resources);
// delete the old elements
for (int i = 0; i < resources.length; ++i) {
try {
resources[i].delete(IResource.KEEP_HISTORY | IResource.FORCE, null);
} catch (CoreException e) {
e.printStackTrace();
}
}
}
}
private IResource[] getSelectedResources() {
List<IResource> resources = Collections.emptyList();
ISelection selection = provider.getSelection();
if (selection instanceof IStructuredSelection) {
IStructuredSelection structured = (IStructuredSelection) selection;
resources = new ArrayList<IResource>(structured.size());
for (Iterator<?> iterator = structured.iterator(); iterator.hasNext();) {
Object element = iterator.next();
IResource resource = null;
if (element instanceof IResource) {
resource = (IResource)element;
} else if (element instanceof IAdaptable) {
IAdaptable adaptable = (IAdaptable) element;
resource = (IResource) adaptable.getAdapter(IResource.class);
}
if (resource != null) {
resources.add(resource);
}
}
}
IResource[] result = new IResource[resources.size()];
resources.toArray(result);
return result;
}
}
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