1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.ui.dnd;
14 import org.eclipse.jface.viewers.ISelection;
15 import org.eclipse.jface.viewers.ISelectionProvider;
16 import org.eclipse.swt.dnd.DragSourceEvent;
17 import org.eclipse.swt.dnd.DragSourceListener;
18 import org.eclipse.swt.dnd.DropTargetListener;
21 * An SWT drag source listener that provides the specified selection provider's
22 * {@link ISelection} as the dragged data to {@link DropTargetListener}s.
25 * Only guaranteed to work with {@link LocalObjectTransfer} which will only work
26 * within a single application.
28 * @author Tuukka Lehtonen
30 public class LocalSelectionDragSourceListener implements DragSourceListener {
32 ISelectionProvider selectionProvider;
35 public LocalSelectionDragSourceListener(ISelectionProvider selectionProvider) {
36 this.selectionProvider = selectionProvider;
39 public ISelection getSelection() {
44 public void dragFinished(DragSourceEvent event) {
45 //System.out.println("SOURCE FINISH " + event);
46 LocalObjectTransfer.getTransfer().clear();
51 public void dragSetData(DragSourceEvent event) {
52 //System.out.println("SOURCE PUT " + event + " " + selection);
53 event.data = selection;
54 LocalObjectTransfer.getTransfer().setObject(selection);
59 public void dragStart(DragSourceEvent event) {
60 //System.out.println("SOURCE START " + event + " " + selectionProvider.getSelection());
61 selection = selectionProvider.getSelection();
62 if (selection == null || selection.isEmpty())
66 LocalObjectTransfer.getTransfer().setObject(selection);