/*******************************************************************************
* Copyright (c) 2006, 2008 Wind River Systems, Inc. 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:
* Markus Schorn - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.ui.includebrowser;
import java.util.Iterator;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.DropTargetListener;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.part.ResourceTransfer;
import org.eclipse.cdt.core.model.CoreModelUtil;
import org.eclipse.cdt.core.model.ITranslationUnit;
import org.eclipse.cdt.internal.core.resources.ResourceLookup;
public class IBDropTargetListener implements DropTargetListener {
private IBViewPart fIncludeBrowser;
private ITranslationUnit fTranslationUnit;
private boolean fEnabled= true;
public IBDropTargetListener(IBViewPart view) {
fIncludeBrowser= view;
}
public void setEnabled(boolean val) {
fEnabled= val;
}
public void dragEnter(DropTargetEvent event) {
fTranslationUnit= null;
checkOperation(event);
if (event.detail != DND.DROP_NONE) {
if (LocalSelectionTransfer.getTransfer().isSupportedType(event.currentDataType)) {
fTranslationUnit= checkLocalSelection();
if (fTranslationUnit == null) {
TransferData alternateDataType = checkForAlternateDataType(event.dataTypes,
new Transfer[] {ResourceTransfer.getInstance(), FileTransfer.getInstance()});
if (alternateDataType == null) {
event.detail= DND.DROP_NONE;
}
else {
event.currentDataType= alternateDataType;
}
}
}
}
}
private TransferData checkForAlternateDataType(TransferData[] dataTypes, Transfer[] transfers) {
for (int i = 0; i < dataTypes.length; i++) {
TransferData dataType = dataTypes[i];
for (int j = 0; j < transfers.length; j++) {
Transfer transfer = transfers[j];
if (transfer.isSupportedType(dataType)) {
return dataType;
}
}
}
return null;
}
private ITranslationUnit checkLocalSelection() {
ISelection sel= LocalSelectionTransfer.getTransfer().getSelection();
if (sel instanceof IStructuredSelection) {
for (Iterator<?> iter = ((IStructuredSelection)sel).iterator(); iter.hasNext();) {
Object element = iter.next();
if (element instanceof ITranslationUnit) {
return (ITranslationUnit) element;
}
}
}
return null;
}
public void dragLeave(DropTargetEvent event) {
}
public void dragOperationChanged(DropTargetEvent event) {
checkOperation(event);
}
public void dragOver(DropTargetEvent event) {
}
public void drop(DropTargetEvent event) {
if (fTranslationUnit == null) {
fTranslationUnit= findFirstTranslationUnit(event.data);
}
if (fTranslationUnit == null) {
fIncludeBrowser.setMessage(IBMessages.IBViewPart_falseInputMessage);
Display.getCurrent().beep();
}
else {
fIncludeBrowser.setInput(fTranslationUnit);
}
}
private ITranslationUnit findFirstTranslationUnit(Object o) {
if (o instanceof String[]) {
String[] filePaths= (String[]) o;
for (int i = 0; i < filePaths.length; i++) {
String filePath = filePaths[i];
ITranslationUnit tu= findTranslationUnit(ResourceLookup.findFilesForLocation(Path.fromOSString(filePath)));
if (tu != null) {
return tu;
}
}
return null;
}
if (o instanceof IResource[]) {
return findTranslationUnit((IResource[]) o);
}
return null;
}
private ITranslationUnit findTranslationUnit(IResource[] files) {
for (int i = 0; i < files.length; i++) {
IResource resource = files[i];
if (resource.getType() == IResource.FILE) {
ITranslationUnit tu= CoreModelUtil.findTranslationUnit((IFile) resource);
if (tu != null) {
return tu;
}
}
}
return null;
}
public void dropAccept(DropTargetEvent event) {
}
private void checkOperation(DropTargetEvent event) {
if (fEnabled && (event.operations & DND.DROP_COPY) != 0) {
event.detail= DND.DROP_COPY;
}
else {
event.detail= DND.DROP_NONE;
}
}
}