2 * Copyright © 2010 Anthony Towns <aj@erisian.com.au>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 import java.awt.event.*;
23 import javax.swing.event.MouseInputAdapter;
25 class GrabNDrag extends MouseInputAdapter {
26 private JComponent scroll;
27 private Point startPt = new Point();
29 public GrabNDrag(JComponent scroll) {
31 scroll.addMouseMotionListener(this);
32 scroll.addMouseListener(this);
33 scroll.setAutoscrolls(true);
36 public void mousePressed(MouseEvent e) {
37 startPt.setLocation(e.getPoint());
39 public void mouseDragged(MouseEvent e) {
40 int xd = e.getX() - startPt.x;
41 int yd = e.getY() - startPt.y;
43 Rectangle r = scroll.getVisibleRect();
46 scroll.scrollRectToVisible(r);