How to make a window transparent, draggable and add some layered components?

Question

I don't know how to add a JLabel on top of a JPanel. I want to display some information in a label on the mobile image. The image is in the JPanel. I already managed to make the JFrame undecorated.

Output http://i44.tinypic.com/2mhacsj.png

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Window;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

class Remote extends JFrame {
    JPanel p2;

    private Window Remote;

    public Remote() {
        createAndShowGUI();
    }

    public void createAndShowGUI() {
        // Set title and default close operation
        setTitle("Transparent Panel");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setUndecorated(true);
        p2 = new JPanel();
        JLabel label = new JLabel(new ImageIcon("C://Mobile.png"));
        p2.add(label);
        p2.setPreferredSize(new Dimension(1000, 800));
        add(p2);
        setLayout(new FlowLayout());
        setSize(315, 610);
        setVisible(true);
        setLocation(800, 100);
    }

    public static void main(String args[]) {
        // Run in the EDT
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                Remote remote = new Remote();
            }
        });
    }

}

I have 3 Questions:

1. How do I remove the borders [background] surrounding the mobile?

2. How do I add some label in the JPanel?

3. How to make the window movable?

Answer 1

This should meet your requirements:

public void createAndShowGUI() {
    setTitle("Transparent Panel");
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    setUndecorated(true);
    AWTUtilities.setWindowOpaque(this, false);

    JLayeredPane layeredPane = new JLayeredPane();
    layeredPane.setBounds(0, 0, 315, 610);

    JLabel mobileImageLabel = new JLabel(new ImageIcon("C://Mobile.png"));
    mobileImageLabel.setBounds(0, 0, 315, 610);
    layeredPane.add(mobileImageLabel, Integer.valueOf(0));

    JLabel textLabel = new JLabel(" Booting... ");
    textLabel.setVerticalAlignment(SwingConstants.TOP);
    textLabel.setForeground(Color.GREEN);
    textLabel.setBounds(26, 59, 263, 495);
    layeredPane.add(textLabel, Integer.valueOf(1));

    setContentPane(layeredPane);

    setSize(315, 610);
    setLocation(800, 100);
    setVisible(true);
}

For a draggable window, call this method from your Remote() constructor:

public void addListeners() {
    final Point offset = new Point();
    addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(final MouseEvent e) {
            offset.setLocation(e.getPoint());
        }
    });
    addMouseMotionListener(new MouseMotionAdapter() {
        @Override
        public void mouseDragged(final MouseEvent e) {
            setLocation(e.getXOnScreen()-offset.x, e.getYOnScreen()-offset.y);
        }
    });
}

Further notes:

• instead of JFrame.add() use: getContentPane().add() or setContentPane()
• AWTUtilities.setWindowOpaque() removes the gray background of an undecorated frame
• a JLayeredPane can be used to stack components on top of each other
• the layout in the JLayeredPane has to be done manually

---

It should now look something like this::