import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.RootPaneContainer;
import javax.swing.SwingUtilities;

public class GlassPaneDemo {

    private static final long serialVersionUID = 1L;
    private JFrame frame;
    private JPanel panel;
    private JLabel label;
    private JButton butt;
    private BufferedImage img;
    private String imgName = "src/img/wien.jpg";

    public GlassPaneDemo() {
        init();
    }

    public void init() {
        frame = new JFrame("GlassPane-Demo") {
            public void paint(Graphics g) {
                int x = (panel.getWidth() - label.getSize().width) / 2;
                int y = (panel.getHeight() - label.getSize().height) / 2;
                label.setBounds(x, y, img.getWidth(), img.getHeight());
                butt.setBounds(panel.getWidth() / 2 - butt.getWidth() / 2, 200,
                        butt.getWidth(), butt.getHeight());
            }
        };
        label = new JLabel();
        panel = new JPanel();
        panel.setOpaque(true);
        panel.setBackground(Color.DARK_GRAY);
        panel.add(label);
        loadImage();
        ImageIcon icon = new ImageIcon(img);
        label.setIcon(icon);
        label.setSize(new Dimension(icon.getIconWidth(), icon.getIconHeight()));
        butt = new JButton("Klick");
        panel.add(butt, 0);
        frame.setSize(label.getWidth() + 40, label.getHeight() + 60);
        Glass glass = new Glass(butt, label, frame);
        butt.addMouseListener(new ButtonMouseListener(glass, frame.getContentPane(),
                butt) {
            public void mouseReleased(MouseEvent e) {
                System.out.println("Button angeklickt");
            }
        });
        frame.getContentPane().add(panel);
        frame.setGlassPane(glass);
        glass.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public void loadImage() {
        File source = new File(imgName);
        if (source.canRead() && source.isFile()) {
            try {
                img = ImageIO.read(source);
            } catch (IOException e1) {
                e1.printStackTrace();
            }
        }
        if (img == null) {
            System.err.println("Kein Bild geladen.");
            System.exit(1);
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new GlassPaneDemo());
    }
}