/*******************************************************************************
* Copyright (c) 2000, 2009 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.ui.views.navigator;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
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.DragSourceAdapter;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DragSourceListener;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.actions.ReadOnlyStateChecker;
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;
import org.eclipse.ui.internal.views.navigator.ResourceNavigatorMessages;
import org.eclipse.ui.part.ResourceTransfer;
import org.eclipse.ui.statushandlers.StatusManager;
/**
* Implements drag behaviour when items are dragged out of the
* resource navigator.
*
* @since 2.0
* @deprecated as of 3.5, use the Common Navigator Framework classes instead
*/
public class NavigatorDragAdapter extends DragSourceAdapter {
private static final String CHECK_MOVE_TITLE = ResourceNavigatorMessages.DragAdapter_title;
private static final String CHECK_DELETE_MESSAGE = ResourceNavigatorMessages.DragAdapter_checkDeleteMessage;
ISelectionProvider selectionProvider;
private TransferData lastDataType;
/**
* Constructs a new drag adapter.
* @param provider The selection provider
*/
public NavigatorDragAdapter(ISelectionProvider provider) {
selectionProvider = provider;
}
/**
* This implementation of {@link DragSourceListener#dragFinished(DragSourceEvent)}
* responds to a drag that has moved resources outside the Navigator by deleting
* the corresponding source resource.
*/
public void dragFinished(DragSourceEvent event) {
LocalSelectionTransfer.getInstance().setSelection(null);
if (event.doit == false) {
return;
}
final int typeMask = IResource.FOLDER | IResource.FILE;
if (event.detail == DND.DROP_MOVE) {
//never delete resources when dragging outside Eclipse.
//workaround for bug 30543.
if (lastDataType != null
&& FileTransfer.getInstance().isSupportedType(lastDataType)) {
return;
}
IResource[] resources = getSelectedResources(typeMask);
DragSource dragSource = (DragSource) event.widget;
Control control = dragSource.getControl();
Shell shell = control.getShell();
ReadOnlyStateChecker checker;
if (resources == null || resources.length == 0) {
return;
}
checker = new ReadOnlyStateChecker(shell, CHECK_MOVE_TITLE,
CHECK_DELETE_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) {
StatusManager.getManager().handle(e, IDEWorkbenchPlugin.IDE_WORKBENCH);
}
}
} else if (event.detail == DND.DROP_TARGET_MOVE) {
IResource[] resources = getSelectedResources(typeMask);
// file moved for us by OS, no need to delete the resources, just
// update the view
if (resources == null) {
return;
}
for (int i = 0; i < resources.length; i++) {
try {
resources[i].refreshLocal(IResource.DEPTH_INFINITE, null);
} catch (CoreException e) {
StatusManager.getManager().handle(e, IDEWorkbenchPlugin.IDE_WORKBENCH);
}
}
}
}
/**
* This implementation of {@link DragSourceListener#dragSetData(DragSourceEvent)}
* sets the drag event data based on the current selection in the Navigator.
*/
public void dragSetData(DragSourceEvent event) {
final int typeMask = IResource.FILE | IResource.FOLDER;
IResource[] resources = getSelectedResources(typeMask);
if (resources == null || resources.length == 0) {
return;
}
lastDataType = event.dataType;
//use local selection transfer if possible
if (LocalSelectionTransfer.getInstance()
.isSupportedType(event.dataType)) {
event.data = LocalSelectionTransfer.getInstance().getSelection();
return;
}
//use resource transfer if possible
if (ResourceTransfer.getInstance().isSupportedType(event.dataType)) {
event.data = resources;
return;
}
//resort to a file transfer
if (!FileTransfer.getInstance().isSupportedType(event.dataType)) {
return;
}
// Get the path of each file and set as the drag data
final int length = resources.length;
int actualLength = 0;
String[] fileNames = new String[length];
for (int i = 0; i < length; i++) {
IPath location = resources[i].getLocation();
// location may be null. See bug 29491.
if (location != null) {
fileNames[actualLength++] = location.toOSString();
}
}
if (actualLength == 0) {
return;
}
// was one or more of the locations null?
if (actualLength < length) {
String[] tempFileNames = fileNames;
fileNames = new String[actualLength];
for (int i = 0; i < actualLength; i++) {
fileNames[i] = tempFileNames[i];
}
}
event.data = fileNames;
}
/**
* This implementation of {@link DragSourceListener#dragStart(DragSourceEvent)}
* allows the drag to start if the current Navigator selection contains resources
* that can be dragged.
*/
public void dragStart(DragSourceEvent event) {
lastDataType = null;
// Workaround for 1GEUS9V
DragSource dragSource = (DragSource) event.widget;
Control control = dragSource.getControl();
if (control != control.getDisplay().getFocusControl()) {
event.doit = false;
return;
}
IStructuredSelection selection = (IStructuredSelection) selectionProvider
.getSelection();
for (Iterator i = selection.iterator(); i.hasNext();) {
Object next = i.next();
if (!(next instanceof IFile || next instanceof IFolder)) {
event.doit = false;
return;
}
}
if (selection.isEmpty()) {
event.doit = false;
return;
}
LocalSelectionTransfer.getInstance().setSelection(selection);
event.doit = true;
}
private IResource[] getSelectedResources(int resourceTypes) {
List resources = new ArrayList();
IResource[] result = new IResource[0];
ISelection selection = selectionProvider.getSelection();
if (!(selection instanceof IStructuredSelection) || selection.isEmpty()) {
return null;
}
IStructuredSelection structuredSelection = (IStructuredSelection) selection;
// loop through list and look for matching items
Iterator itr = structuredSelection.iterator();
while (itr.hasNext()) {
Object obj = itr.next();
if (obj instanceof IResource) {
IResource res = (IResource) obj;
if ((res.getType() & resourceTypes) == res.getType()) {
resources.add(res);
}
}
}
result = new IResource[resources.size()];
resources.toArray(result);
return result;
}
}