!7

static int windowSize = 11; // odd should look nice. Set to 1 for an invisible window
static int clickDelay = 0; // Delay in ms between closing window and forwarding click. 0 seems to work fine.
static int trackingSpeed = 10; // How often to move the window (ms)

p {
  final new JWindow window;
  window.setSize(windowSize, windowSize);
  window.setVisible(true);
  window.setAlwaysOnTop(true);
  JPanel panel = singleColorPanel(Color.red);
  window.setContentPane(panel);
  revalidate(window);
  final new Robot robot;
  panel.addMouseListener(new MouseAdapter {
    // public void mousePressed(final MouseEvent e) {}
    
    public void mouseReleased(final MouseEvent e) {
      print("release! " + e);
      window.setVisible(false);
      int b = e.getButton();
      final int mod =
        b == 1 ? InputEvent.BUTTON1_DOWN_MASK
        : b == 2 ? InputEvent.BUTTON2_DOWN_MASK
        : InputEvent.BUTTON3_DOWN_MASK;
      swingLater(clickDelay, r {
        print("clicking " + mod);
        robot.mousePress(mod);
        robot.mouseRelease(mod);
      });
    }
  });
  
  swingEvery(window, trackingSpeed, r {
    Point p = getMouseLocation();
    window.setLocation(p.x-windowSize/2, p.y-windowSize/2);
    //print("moving");
  });
}