import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.plaf.metal.DefaultMetalTheme;
import javax.swing.plaf.metal.MetalLookAndFeel;
import javax.swing.plaf.metal.OceanTheme;

import swing.BonbonTheme;
import swing.DeepBlueTheme;

public class ThemeDemo implements ActionListener {

    private final JFrame frame;
    private JLabel label;
    private JButton lfButton, themeButton;
    private JTextArea area;
    private JScrollPane pane;
    private int lAF = 1, themeNr = 1;
    private DefaultMetalTheme theme;
    private JMenuItem exit;

    public ThemeDemo() {
        frame = new JFrame("Theme-Demo");
        initComponents();
        updateLAF();
    }

    private void initComponents() {
        if(frame == null) {
            System.err.println("Frame is not initialized");
            System.exit(1);
        }
        JMenuBar menuBar = new JMenuBar();
        JMenu menu = new JMenu("Datei");
        exit = new JMenuItem("exit");
        exit.addActionListener(this);
        menu.add(exit);
        menuBar.add(menu);
        lfButton = new JButton("L & F");
        lfButton.addActionListener(this);
        themeButton = new JButton("Theme");
        themeButton.addActionListener(this);
        label = new JLabel();
        area = new JTextArea();
        pane = new JScrollPane(area, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

        JPanel buttPanel = new JPanel(new FlowLayout());
        buttPanel.add(lfButton);
        buttPanel.add(themeButton);

        JPanel mainPanel = new JPanel(new BorderLayout());
        mainPanel.setBorder(BorderFactory.createEmptyBorder(30, 30, 10, 30));

        mainPanel.add(label, BorderLayout.NORTH);
        mainPanel.add(pane, BorderLayout.CENTER);
        mainPanel.add(buttPanel, BorderLayout.SOUTH);

        frame.add(menuBar, BorderLayout.NORTH);
        frame.add(mainPanel, BorderLayout.CENTER);
        frame.setSize(400, 300);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    private void updateLAF() {
        try {
            String plaf = "";
            themeButton.setEnabled(false);
            label.setText(" L & F Nr.: " + new Integer(lAF).toString());
            if (lAF == 1) {
                themeButton.setEnabled(true);
                return;
            } else if (lAF == 2) {
                plaf = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
            } else if (lAF == 3) {
                plaf = "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
            } else if (lAF == 4) {
                plaf = UIManager.getSystemLookAndFeelClassName();
            }

            UIManager.setLookAndFeel(plaf);
            setText(UIManager.getLookAndFeel().getName());
            SwingUtilities.updateComponentTreeUI(frame);

        } catch (UnsupportedLookAndFeelException ue) {
            System.err.println(ue.toString());
        } catch (ClassNotFoundException ce) {
            System.err.println(ce.toString());
        } catch (InstantiationException ie) {
            System.err.println(ie.toString());
        } catch (IllegalAccessException iae) {
            System.err.println(iae.toString());
        }
    }

    private void updateTheme() {
        switch (themeNr) {
        case 1:
            theme = new DeepBlueTheme();
            break;
        case 2:
            theme = new BonbonTheme();
            break;
        case 3:
            theme = new DefaultMetalTheme();
            break;
        case 4:
            theme = new OceanTheme();
            break;
        }
        
        MetalLookAndFeel.setCurrentTheme(theme);
        try {
            UIManager.setLookAndFeel(new MetalLookAndFeel());
        } catch (UnsupportedLookAndFeelException e) {
            e.printStackTrace();
        }
        setText(UIManager.getLookAndFeel().getName() + "\nTheme: "
                + theme.getName());
        SwingUtilities.updateComponentTreeUI(frame);

    }

    private void setText(String text) {
        area.setText(text);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == lfButton) {
            lAF++;
            if (lAF > 4)
                lAF = 1;
            updateLAF();
        }
        if (e.getSource() == themeButton) {
            themeNr++;
            if (themeNr > 4)
                themeNr = 1;
            updateTheme();
        }
        if (e.getSource() == exit) {
            System.exit(0);
        }
    }

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