01: /*******************************************************************************
02: * Copyright (c) 2000, 2006 IBM Corporation and others.
03: * All rights reserved. This program and the accompanying materials
04: * are made available under the terms of the Eclipse Public License v1.0
05: * which accompanies this distribution, and is available at
06: * http://www.eclipse.org/legal/epl-v10.html
07: *
08: * Contributors:
09: * IBM Corporation - initial API and implementation
10: *******************************************************************************/package org.eclipse.jdt.internal.ui.dnd;
11:
12: import org.eclipse.core.runtime.Assert;
13:
14: import org.eclipse.swt.dnd.DND;
15: import org.eclipse.swt.dnd.DragSourceAdapter;
16: import org.eclipse.swt.dnd.DragSourceEvent;
17: import org.eclipse.swt.dnd.Transfer;
18:
19: import org.eclipse.jface.util.TransferDragSourceListener;
20: import org.eclipse.jface.viewers.ISelection;
21: import org.eclipse.jface.viewers.ISelectionProvider;
22:
23: import org.eclipse.ui.views.navigator.LocalSelectionTransfer;
24:
25: public class BasicSelectionTransferDragAdapter extends
26: DragSourceAdapter implements TransferDragSourceListener {
27:
28: private ISelectionProvider fProvider;
29:
30: public BasicSelectionTransferDragAdapter(ISelectionProvider provider) {
31: Assert.isNotNull(provider);
32: fProvider = provider;
33: }
34:
35: /**
36: * @see TransferDragSourceListener#getTransfer
37: */
38: public Transfer getTransfer() {
39: return LocalSelectionTransfer.getInstance();
40: }
41:
42: /* non Java-doc
43: * @see org.eclipse.swt.dnd.DragSourceListener#dragStart
44: */
45: public void dragStart(DragSourceEvent event) {
46: ISelection selection = fProvider.getSelection();
47: LocalSelectionTransfer.getInstance().setSelection(selection);
48: LocalSelectionTransfer.getInstance().setSelectionSetTime(
49: event.time & 0xFFFFFFFFL);
50: event.doit = isDragable(selection);
51: }
52:
53: /**
54: * Checks if the elements contained in the given selection can
55: * be dragged.
56: * <p>
57: * Subclasses may override.
58: *
59: * @param selection containing the elements to be dragged
60: */
61: protected boolean isDragable(ISelection selection) {
62: return true;
63: }
64:
65: /* non Java-doc
66: * @see org.eclipse.swt.dnd.DragSourceListener#dragSetData
67: */
68: public void dragSetData(DragSourceEvent event) {
69: // For consistency set the data to the selection even though
70: // the selection is provided by the LocalSelectionTransfer
71: // to the drop target adapter.
72: event.data = LocalSelectionTransfer.getInstance()
73: .getSelection();
74: }
75:
76: /* non Java-doc
77: * @see org.eclipse.swt.dnd.DragSourceListener#dragFinished
78: */
79: public void dragFinished(DragSourceEvent event) {
80: // Make sure we don't have to do any remaining work
81: Assert.isTrue(event.detail != DND.DROP_MOVE);
82: LocalSelectionTransfer.getInstance().setSelection(null);
83: LocalSelectionTransfer.getInstance().setSelectionSetTime(0);
84: }
85: }
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