/* * Copyright © 2010 Anthony Towns * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ package altosui; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.MouseInputAdapter; class GrabNDrag extends MouseInputAdapter { private JComponent scroll; private Point startPt = new Point(); public GrabNDrag(JComponent scroll) { this.scroll = scroll; scroll.addMouseMotionListener(this); scroll.addMouseListener(this); scroll.setAutoscrolls(true); } public void mousePressed(MouseEvent e) { startPt.setLocation(e.getPoint()); } public void mouseDragged(MouseEvent e) { int xd = e.getX() - startPt.x; int yd = e.getY() - startPt.y; Rectangle r = scroll.getVisibleRect(); r.x -= xd; r.y -= yd; scroll.scrollRectToVisible(r); } }