KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > eclipse > jdt > internal > ui > dnd > JdtViewerDragAdapter


1 /*******************************************************************************
2  * Copyright (c) 2000, 2006 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/
11 package org.eclipse.jdt.internal.ui.dnd;
12
13 import org.eclipse.core.runtime.Assert;
14
15 import org.eclipse.swt.dnd.DragSourceEvent;
16
17 import org.eclipse.jface.util.TransferDragSourceListener;
18 import org.eclipse.jface.viewers.IStructuredSelection;
19 import org.eclipse.jface.viewers.StructuredViewer;
20
21 public class JdtViewerDragAdapter extends DelegatingDragAdapter {
22
23     private StructuredViewer fViewer;
24
25     public JdtViewerDragAdapter(StructuredViewer viewer, TransferDragSourceListener[] listeners) {
26         super(listeners);
27         Assert.isNotNull(viewer);
28         fViewer= viewer;
29     }
30     
31     public void dragStart(DragSourceEvent event) {
32         IStructuredSelection selection= (IStructuredSelection)fViewer.getSelection();
33         if (selection.isEmpty()) {
34             event.doit= false;
35             return;
36         }
37         super.dragStart(event);
38     }
39 }
40
Popular Tags