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; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
19 package org.altusmetrum.altosuilib_12;
22 import java.awt.event.*;
24 import javax.swing.event.MouseInputAdapter;
26 class GrabNDrag extends MouseInputAdapter {
27 private JComponent scroll;
28 private Point startPt = new Point();
30 public GrabNDrag(JComponent scroll) {
32 scroll.addMouseMotionListener(this);
33 scroll.addMouseListener(this);
34 scroll.setAutoscrolls(true);
37 public static boolean grab_n_drag(MouseEvent e) {
38 return e.getModifiers() == InputEvent.BUTTON1_MASK;
41 public void mousePressed(MouseEvent e) {
43 startPt.setLocation(e.getPoint());
45 public void mouseDragged(MouseEvent e) {
47 int xd = e.getX() - startPt.x;
48 int yd = e.getY() - startPt.y;
50 Rectangle r = scroll.getVisibleRect();
53 scroll.scrollRectToVisible(r);