| /****************************************************************************** |
| * Copyright (c) 2005, 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.gmf.runtime.diagram.ui.internal.parts; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.core.resources.IFile; |
| import org.eclipse.core.runtime.IAdaptable; |
| import org.eclipse.emf.ecore.EObject; |
| import org.eclipse.gef.EditPartViewer; |
| import org.eclipse.gmf.runtime.diagram.ui.parts.DiagramDropTargetListener; |
| import org.eclipse.jface.viewers.IStructuredSelection; |
| import org.eclipse.swt.SWTException; |
| import org.eclipse.swt.dnd.DropTargetEvent; |
| import org.eclipse.swt.dnd.FileTransfer; |
| |
| /** |
| * Drop target listener to support dropping of image files onto the diagram |
| * surface. |
| * |
| * @author sshaw |
| */ |
| public class ImageFileDropTargetListener |
| extends DiagramDropTargetListener { |
| |
| /** |
| * @param viewer |
| * @param xfer |
| */ |
| public ImageFileDropTargetListener(EditPartViewer viewer) { |
| super(viewer, FileTransfer.getInstance()); |
| } |
| |
| /** |
| * This implementation includes in the list only elements that are instances |
| * of IElement. |
| * |
| * @see org.eclipse.gmf.runtime.diagram.ui.parts.DiagramDropTargetListener#getElementsBeingDropped() |
| */ |
| protected List getObjectsBeingDropped() { |
| List<String> filesList = new ArrayList<String>(); |
| if (getCurrentEvent().data instanceof String[]) { |
| insertFileNamesFromStringArray(filesList, |
| (String[]) getCurrentEvent().data); |
| } else if (getCurrentEvent().data instanceof IStructuredSelection) { |
| Object[] array = ((IStructuredSelection)getCurrentEvent().data).toArray(); |
| for (int j = 0; j < array.length; j++) { |
| if (array[j] instanceof IFile) { |
| IFile dropFile = (IFile)array[j]; |
| filesList.add(dropFile.getLocation().toOSString()); |
| } |
| } |
| |
| } else { |
| /* |
| * No needs to check if transfered data we're looking at is FileTransfer type data. |
| * This drop target listener is invoked as <code>DelegatingDropAdapter</code>, hence |
| * if we get here the transfer is supported for the DropTargetEvent#currentDataType |
| */ |
| try { |
| Object files = FileTransfer.getInstance().nativeToJava( |
| getCurrentEvent().currentDataType); |
| if (files instanceof String[]) { |
| insertFileNamesFromStringArray(filesList, (String[]) files); |
| } |
| } catch (SWTException e) { |
| return null; |
| } |
| } |
| |
| if (filesList.size() > 0) { |
| return filesList; |
| } |
| |
| return null; |
| } |
| |
| private void insertFileNamesFromStringArray(List<String> filesList, String[] fileNames) { |
| for (int i = 0; i < fileNames.length; i++) { |
| filesList.add(fileNames[i]); |
| } |
| } |
| |
| /** |
| * This implementation assumes that elements being dropped are instances of |
| * IElement. |
| * |
| */ |
| public boolean isEnabled(DropTargetEvent event) { |
| |
| if (super.isEnabled(event)) { |
| Object modelObj = getViewer().getContents().getModel(); |
| |
| if (modelObj instanceof EObject) { |
| return true; |
| } else if (modelObj instanceof IAdaptable) { |
| final EObject target = (EObject) ((IAdaptable) modelObj) |
| .getAdapter(EObject.class); |
| |
| // additional check |
| if (target == null) { |
| return false; |
| } |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.gmf.runtime.diagram.ui.parts.DiagramDropTargetListener#isDataTransfered() |
| */ |
| protected boolean isDataTransfered() { |
| /* |
| * The data transfer occurs at the drop time on Linux, hence data is transfered when the request |
| * has some objects that are being dropped. |
| */ |
| return super.isDataTransfered() && !getDropObjectsRequest().getObjects().isEmpty(); |
| } |
| |
| } |