Drag and move a frame from its content area

    

import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JPanel {
  public void paintComponent(Graphics g) {
    g.setColor(Color.black);
    g.fillRect(0, 0, getWidth(), getHeight());
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setPreferredSize(new Dimension(300, 280));

    Main ch = new Main();
    frame.getContentPane().add(ch);
    frame.setUndecorated(true);

    MoveMouseListener mml = new MoveMouseListener(ch);
    ch.addMouseListener(mml);
    ch.addMouseMotionListener(mml);

    frame.pack();
    frame.setVisible(true);
  }
}

class MoveMouseListener implements MouseListener, MouseMotionListener {
  JComponent target;
  Point start_drag;
  Point start_loc;

  public MoveMouseListener(JComponent target) {
    this.target = target;
  }

  public static JFrame getFrame(Container target) {
    if (target instanceof JFrame) {
      return (JFrame) target;
    }
    return getFrame(target.getParent());
  }

  Point getScreenLocation(MouseEvent e) {
    Point cursor = e.getPoint();
    Point target_location = this.target.getLocationOnScreen();
    return new Point((int) (target_location.getX() + cursor.getX()),
        (int) (target_location.getY() + cursor.getY()));
  }

  public void mouseClicked(MouseEvent e) {
  }

  public void mouseEntered(MouseEvent e) {
  }

  public void mouseExited(MouseEvent e) {
  }

  public void mousePressed(MouseEvent e) {
    this.start_drag = this.getScreenLocation(e);
    this.start_loc = this.getFrame(this.target).getLocation();
  }

  public void mouseReleased(MouseEvent e) {
  }

  public void mouseDragged(MouseEvent e) {
    Point current = this.getScreenLocation(e);
    Point offset = new Point((int) current.getX() - (int) start_drag.getX(),
        (int) current.getY() - (int) start_drag.getY());
    JFrame frame = this.getFrame(target);
    Point new_location = new Point(
        (int) (this.start_loc.getX() + offset.getX()), (int) (this.start_loc
            .getY() + offset.getY()));
    frame.setLocation(new_location);
  }

  public void mouseMoved(MouseEvent e) {
  }
}

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Drag and move a frame from its content area : Frame « Swing JFC « Java

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