How to make JLabel floating above same JComponent inside JScrollPane

Question

There are 20 JLabels inside JScrollPane. There is also floatingLabel added to JLayeredPane together with JscrollPane mentioned above.

The requirement is that when I click inside JScrollPane it should scroll automatically to make JLabel with index 11 completely visible. Also floatingLabel should start floating above that JLabel 11 when a user scrolls JScrollPane, refer to AdjustmentListener.

Issues [EDIT]: 1. How to check that JLabel 11 becomes completely or partially invisible?

SSCCE:

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Point;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;

public class JScrollPaneTest {
    protected ArrayList<JLabel> labels = new ArrayList<JLabel>();
    protected JLabel floatingLabel = new JLabel("floating");
    protected JFrame frame;
    protected JScrollPane sPane;
    protected JLayeredPane lPane;

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new JScrollPaneTest();
            }
        });
    }

    public JScrollPaneTest() {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());

                lPane = new JLayeredPane() {
                    private static final long serialVersionUID = 1L;

                    @Override
                    public Dimension getPreferredSize() {
                        return new Dimension(800, 600);
                    }
                };

                JPanel panel = new JPanel ();

                panel.setLayout(new GridBagLayout());
                GridBagConstraints gbc = new GridBagConstraints();

                for (int i = 0; i < 20; i++) {
                    JLabel label = new JLabel("  | Label" + i + " |  ");
                    panel.add(label, gbc);
                    labels.add(label);
                }

                panel.addMouseListener(new MouseAdapter(){
                    public void mousePressed (MouseEvent me) {
                        JLabel label = labels.get(11);
                        label.scrollRectToVisible(label.getBounds());

                        Point loc = label.getLocation();
                        Point wrPos = SwingUtilities.convertPoint(label, loc, lPane);
                        floatingLabel.setLocation(wrPos);
                        floatingLabel.setVisible(true);
                    }
                });

                sPane = new JScrollPane(panel) {
                    private static final long serialVersionUID = 1L;

                    @Override
                    public Dimension getPreferredSize() {
                        return new Dimension(600, 400);
                    }
                };

                sPane.getHorizontalScrollBar().addAdjustmentListener(new AdjustmentListener() {
                    @Override
                    public void adjustmentValueChanged(AdjustmentEvent ae) {
                        System.out.println("adjustmentValueChanged: " + ae.getValue());

                        //if label11 is not visible
                        //floatingLabel.setVisible(false);
                        //else floatingLabel.setLocation();
                    }
                });

                lPane.add(sPane, JLayeredPane.PALETTE_LAYER);
                sPane.setBounds(100, 100, (int)sPane.getPreferredSize().getWidth(), (int)sPane.getPreferredSize().getHeight());

                lPane.add(floatingLabel, JLayeredPane.POPUP_LAYER);
                floatingLabel.setBounds(100, 100, 50, 30);
                floatingLabel.setBorder(BorderFactory.createLineBorder(Color.red));

                frame.getContentPane().add(lPane);
                frame.pack();
                frame.setVisible(true);
            }
        });
    }
}

Solved issues:

1. JLabel 11 is not completely visible after click, it is half cropped
2. I fail to calculate proper location for floatingPanel on click
3. I don't know how to calculate new location on scrolling

Answer 1

label.scrollRectToVisible(new Rectangle(0,0,label.getWidth(), label.getHeight()));

Use this instead in the click

public void mousePressed (MouseEvent me) {
  JLabel label = labels.get(11);
  label.scrollRectToVisible(new Rectangle(0,0,label.getWidth(), label.getHeight()));

  //Point loc = label.getLocation();
  Point loc = new Point(0,0);
  Point wrPos = SwingUtilities.convertPoint(label, loc, lPane);
  floatingLabel.setLocation(wrPos);
  floatingLabel.setVisible(true);
}

public void adjustmentValueChanged(AdjustmentEvent ae) {
  System.out.println("adjustmentValueChanged: " + ae.getValue());

  JLabel label = labels.get(11);

  Point loc = new Point(0,0);
  Point wrPos = SwingUtilities.convertPoint(label, loc, lPane);
  floatingLabel.setLocation(wrPos);
  floatingLabel.setVisible(true);
}