MotionPanel.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication14;

import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 *
 * @author bangmaple
 */
public class MotionPanel extends JPanel {
    private Point initialClick;
    private JFrame parent;

    public MotionPanel(final JFrame parent){
    this.parent = parent;

    addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent e) {
            initialClick = e.getPoint();
            getComponentAt(initialClick);
        }
    });

    addMouseMotionListener(new MouseMotionAdapter() {
        @Override
        public void mouseDragged(MouseEvent e) {

            // get location of Window
            int thisX = parent.getLocation().x;
            int thisY = parent.getLocation().y;

            // Determine how much the mouse moved since the initial click
            int xMoved = e.getX() - initialClick.x;
            int yMoved = e.getY() - initialClick.y;

            // Move window to this position
            int X = thisX + xMoved;
            int Y = thisY + yMoved;
            parent.setLocation(X, Y);
        }
    });
    }
}