updated build.xml
[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / ui / dnd / JdtViewerDragAdapter.java
1 /*******************************************************************************
2  * Copyright (c) 2000, 2003 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials 
4  * are made available under the terms of the Common Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/cpl-v10.html
7  * 
8  * Contributors:
9  *     IBM Corporation - initial API and implementation
10  *******************************************************************************/
11 package net.sourceforge.phpdt.internal.ui.dnd;
12
13 import org.eclipse.swt.dnd.DragSourceEvent;
14
15 import org.eclipse.jface.util.Assert;
16 import org.eclipse.jface.viewers.IStructuredSelection;
17 import org.eclipse.jface.viewers.StructuredViewer;
18
19 public class JdtViewerDragAdapter extends DelegatingDragAdapter {
20
21         private StructuredViewer fViewer;
22
23         public JdtViewerDragAdapter(StructuredViewer viewer, TransferDragSourceListener[] listeners) {
24                 super(listeners);
25                 Assert.isNotNull(viewer);
26                 fViewer= viewer;
27         }
28         
29         public void dragStart(DragSourceEvent event) {
30                 IStructuredSelection selection= (IStructuredSelection)fViewer.getSelection();
31                 if (selection.isEmpty()) {
32                         event.doit= false;
33                         return; 
34                 }
35                 super.dragStart(event);
36         }
37 }