1 /*
2 * File: TimeScaleDragSupport.java
3 * Copyright (c) 2004-2007 Peter Kliem (Peter.Kliem@jaret.de)
4 * A commercial license is available, see http://www.jaret.de.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20 package de.jaret.util.ui.timebars.swt.util;
21
22 import org.eclipse.swt.SWT;
23 import org.eclipse.swt.events.MouseEvent;
24 import org.eclipse.swt.events.MouseMoveListener;
25
26 import de.jaret.util.ui.timebars.TimeBarViewerDelegate;
27 import de.jaret.util.ui.timebars.swt.TimeBarViewer;
28
29 /**
30 * Little utility allowing dragging the time scale and optionaly the diagram area in addition to using the scroll bar.
31 *
32 * @author kliem
33 * @version $Id: TimeScaleDragSupport.java 622 2007-11-01 15:23:19Z kliem $
34 */
35 public class TimeScaleDragSupport implements MouseMoveListener {
36 /** last registered x position. */
37 private int _lastX = -1;
38 /** last registered y position. */
39 private int _lastY = -1;
40 /** viewer tha has been hooked. */
41 private TimeBarViewer _tbv;
42
43 /** true if dragging on the diagram is monitored as well. */
44 private boolean _includeDiagram = false;
45
46 /**
47 * Construct the support for a timebar viewer.
48 *
49 * @param tbv timebar viewer
50 * @param includeDiagram <code>true</code> causes dragging on the diagram itself to be translated into scrolling
51 */
52 public TimeScaleDragSupport(TimeBarViewer tbv, boolean includeDiagram) {
53 _tbv = tbv;
54 _includeDiagram = includeDiagram;
55 _tbv.addMouseMoveListener(this);
56 }
57
58 /**
59 * Construct the support for a timebar viewer. Timescale monitoring only.
60 *
61 * @param tbv timebar viewer
62 */
63 public TimeScaleDragSupport(TimeBarViewer tbv) {
64 this(tbv, false);
65 }
66
67 /**
68 * {@inheritDoc}
69 */
70 public void mouseMove(MouseEvent me) {
71 TimeBarViewerDelegate delegate = (TimeBarViewerDelegate) _tbv.getData("delegate");
72 if ((me.stateMask & SWT.BUTTON1) != 0
73 && (delegate.getXAxisRect().contains(me.x, me.y) || (_includeDiagram && delegate.getDiagramRect()
74 .contains(me.x, me.y)))) {
75 if (_lastX != -1) {
76 int seconds = _tbv.dateForXY(me.x, me.y).diffSeconds(_tbv.dateForXY(_lastX, _lastY));
77 _tbv.setStartDate(_tbv.getStartDate().copy().advanceSeconds(-seconds));
78 }
79 _lastX = me.x;
80 _lastY = me.y;
81 } else {
82 _lastX = -1;
83 }
84 }
85 }