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/*
* Copyright © 2010 Anthony Towns <aj@erisian.com.au>
*
* 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 org.altusmetrum.altosuilib_8;
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 static boolean grab_n_drag(MouseEvent e) {
return e.getModifiers() == InputEvent.BUTTON1_MASK;
}
public void mousePressed(MouseEvent e) {
if (grab_n_drag(e))
startPt.setLocation(e.getPoint());
}
public void mouseDragged(MouseEvent e) {
if (grab_n_drag(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);
}
}
}
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