/*
 * Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 */

import javax.swing.*;
import javax.swing.filechooser.*;
import javax.swing.plaf.FileChooserUI;
import javax.swing.plaf.basic.BasicFileChooserUI;

import java.awt.*;
import java.io.File;
import java.awt.event.*;
import java.beans.*;
import java.util.Vector;

import static javax.swing.JFileChooser.*;

/**
 *
 * A demo which makes extensive use of the file chooser.
 *
 * @author Jeff Dinkins
 */
public class FileChooserDemo extends JPanel implements ActionListener {
    private static JFrame frame;

    private final Vector<SupportedLaF> supportedLaFs = new Vector();

    private static class SupportedLaF {
        private final String name;
        private final LookAndFeel laf;

        SupportedLaF(String name, LookAndFeel laf) {
            this.name = name;
            this.laf = laf;
        }

        public String toString() {
            return name;
        }
    }


    private JButton showButton;

    private JCheckBox showAllFilesFilterCheckBox;
    private JCheckBox showImageFilesFilterCheckBox;
    private JCheckBox showFullDescriptionCheckBox;

    private JCheckBox useFileViewCheckBox;
    private JCheckBox useFileSystemViewCheckBox;
    private JCheckBox accessoryCheckBox;
    private JCheckBox setHiddenCheckBox;
    private JCheckBox useEmbedInWizardCheckBox;
    private JCheckBox useControlsCheckBox;
    private JCheckBox enableDragCheckBox;

    private JRadioButton singleSelectionRadioButton;
    private JRadioButton multiSelectionRadioButton;

    private JRadioButton openRadioButton;
    private JRadioButton saveRadioButton;
    private JRadioButton customButton;

    private JComboBox lafComboBox;

    private JRadioButton justFilesRadioButton;
    private JRadioButton justDirectoriesRadioButton;
    private JRadioButton bothFilesAndDirectoriesRadioButton;

    private JTextField customField;

    private final ExampleFileView fileView;

    private final ExampleFileSystemView fileSystemView;

    private final static Dimension hpad10 = new Dimension(10,1);
    private final static Dimension vpad20 = new Dimension(1,20);
    private final static Dimension vpad7 = new Dimension(1, 7);
    private final static Dimension vpad4 = new Dimension(1, 4);
    private final static Insets insets = new Insets(5, 10, 0, 10);

    private final FilePreviewer previewer;
    private final JFileChooser chooser;

    public FileChooserDemo() {
        UIManager.LookAndFeelInfo[] installedLafs = UIManager.getInstalledLookAndFeels();
        for (UIManager.LookAndFeelInfo lafInfo : installedLafs) {
            try {
                Class lnfClass = Class.forName(lafInfo.getClassName());
                LookAndFeel laf = (LookAndFeel)(lnfClass.newInstance());
                if (laf.isSupportedLookAndFeel()) {
                    String name = lafInfo.getName();
                    supportedLaFs.add(new SupportedLaF(name, laf));
                }
            } catch (Exception e) { // If ANYTHING weird happens, don't add it
            }
        }

        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

        chooser = new JFileChooser();
        previewer = new FilePreviewer(chooser);

        // Create Custom FileView
        fileView = new ExampleFileView();
        fileView.putIcon("jpg", new ImageIcon(getClass().getResource("/resources/images/jpgIcon.jpg")));
        fileView.putIcon("gif", new ImageIcon(getClass().getResource("/resources/images/gifIcon.gif")));

        // Create Custom FileSystemView
        fileSystemView = new ExampleFileSystemView();

        // create a radio listener to listen to option changes
        OptionListener optionListener = new OptionListener();

        // Create options
        openRadioButton = new JRadioButton("Open");
        openRadioButton.setSelected(true);
        openRadioButton.addActionListener(optionListener);

        saveRadioButton = new JRadioButton("Save");
        saveRadioButton.addActionListener(optionListener);

        customButton = new JRadioButton("Custom");
        customButton.addActionListener(optionListener);

        customField = new JTextField(8) {
            public Dimension getMaximumSize() {
                return new Dimension(getPreferredSize().width, getPreferredSize().height);
            }
        };
        customField.setText("Doit");
        customField.setAlignmentY(JComponent.TOP_ALIGNMENT);
        customField.setEnabled(false);
        customField.addActionListener(optionListener);

        ButtonGroup group1 = new ButtonGroup();
        group1.add(openRadioButton);
        group1.add(saveRadioButton);
        group1.add(customButton);

        // filter buttons
        showAllFilesFilterCheckBox = new JCheckBox("Show \"All Files\" Filter");
        showAllFilesFilterCheckBox.addActionListener(optionListener);
        showAllFilesFilterCheckBox.setSelected(true);

        showImageFilesFilterCheckBox = new JCheckBox("Show JPG and GIF Filters");
        showImageFilesFilterCheckBox.addActionListener(optionListener);
        showImageFilesFilterCheckBox.setSelected(false);

        accessoryCheckBox = new JCheckBox("Show Preview");
        accessoryCheckBox.addActionListener(optionListener);
        accessoryCheckBox.setSelected(false);

        // more options
        setHiddenCheckBox = new JCheckBox("Show Hidden Files");
        setHiddenCheckBox.addActionListener(optionListener);

        showFullDescriptionCheckBox = new JCheckBox("With File Extensions");
        showFullDescriptionCheckBox.addActionListener(optionListener);
        showFullDescriptionCheckBox.setSelected(true);
        showFullDescriptionCheckBox.setEnabled(false);

        useFileViewCheckBox = new JCheckBox("Use FileView");
        useFileViewCheckBox.addActionListener(optionListener);
        useFileViewCheckBox.setSelected(false);

        useFileSystemViewCheckBox = new JCheckBox("Use FileSystemView", false);
        useFileSystemViewCheckBox.addActionListener(optionListener);

        useEmbedInWizardCheckBox = new JCheckBox("Embed in Wizard");
        useEmbedInWizardCheckBox.addActionListener(optionListener);
        useEmbedInWizardCheckBox.setSelected(false);

        useControlsCheckBox = new JCheckBox("Show Control Buttons");
        useControlsCheckBox.addActionListener(optionListener);
        useControlsCheckBox.setSelected(true);

        enableDragCheckBox = new JCheckBox("Enable Dragging");
        enableDragCheckBox.addActionListener(optionListener);

        // File or Directory chooser options
        ButtonGroup group3 = new ButtonGroup();
        justFilesRadioButton = new JRadioButton("Just Select Files");
        justFilesRadioButton.setSelected(true);
        group3.add(justFilesRadioButton);
        justFilesRadioButton.addActionListener(optionListener);

        justDirectoriesRadioButton = new JRadioButton("Just Select Directories");
        group3.add(justDirectoriesRadioButton);
        justDirectoriesRadioButton.addActionListener(optionListener);

        bothFilesAndDirectoriesRadioButton = new JRadioButton("Select Files or Directories");
        group3.add(bothFilesAndDirectoriesRadioButton);
        bothFilesAndDirectoriesRadioButton.addActionListener(optionListener);

        singleSelectionRadioButton = new JRadioButton("Single Selection", true);
        singleSelectionRadioButton.addActionListener(optionListener);

        multiSelectionRadioButton = new JRadioButton("Multi Selection");
        multiSelectionRadioButton.addActionListener(optionListener);

        ButtonGroup group4 = new ButtonGroup();
        group4.add(singleSelectionRadioButton);
        group4.add(multiSelectionRadioButton);


        // Create show button
        showButton = new JButton("Show FileChooser");
        showButton.addActionListener(this);
        showButton.setMnemonic('s');

        // Create laf combo box
        lafComboBox = new JComboBox(supportedLaFs);
        lafComboBox.setEditable(false);
        lafComboBox.addActionListener(optionListener);

        // ********************************************************
        // ******************** Dialog Type ***********************
        // ********************************************************
        JPanel control1 = new InsetPanel(insets);
        control1.setBorder(BorderFactory.createTitledBorder("Dialog Type"));

        control1.setLayout(new BoxLayout(control1, BoxLayout.Y_AXIS));
        control1.add(Box.createRigidArea(vpad20));
        control1.add(openRadioButton);
        control1.add(Box.createRigidArea(vpad7));
        control1.add(saveRadioButton);
        control1.add(Box.createRigidArea(vpad7));
        control1.add(customButton);
        control1.add(Box.createRigidArea(vpad4));
        JPanel fieldWrapper = new JPanel();
        fieldWrapper.setLayout(new BoxLayout(fieldWrapper, BoxLayout.X_AXIS));
        fieldWrapper.setAlignmentX(Component.LEFT_ALIGNMENT);
        fieldWrapper.add(Box.createRigidArea(hpad10));
        fieldWrapper.add(Box.createRigidArea(hpad10));
        fieldWrapper.add(customField);
        control1.add(fieldWrapper);
        control1.add(Box.createRigidArea(vpad20));
        control1.add(Box.createGlue());

        // ********************************************************
        // ***************** Filter Controls **********************
        // ********************************************************
        JPanel control2 = new InsetPanel(insets);
        control2.setBorder(BorderFactory.createTitledBorder("Filter Controls"));
        control2.setLayout(new BoxLayout(control2, BoxLayout.Y_AXIS));
        control2.add(Box.createRigidArea(vpad20));
        control2.add(showAllFilesFilterCheckBox);
        control2.add(Box.createRigidArea(vpad7));
        control2.add(showImageFilesFilterCheckBox);
        control2.add(Box.createRigidArea(vpad4));
        JPanel checkWrapper = new JPanel();
        checkWrapper.setLayout(new BoxLayout(checkWrapper, BoxLayout.X_AXIS));
        checkWrapper.setAlignmentX(Component.LEFT_ALIGNMENT);
        checkWrapper.add(Box.createRigidArea(hpad10));
        checkWrapper.add(Box.createRigidArea(hpad10));
        checkWrapper.add(showFullDescriptionCheckBox);
        control2.add(checkWrapper);
        control2.add(Box.createRigidArea(vpad20));
        control2.add(Box.createGlue());

        // ********************************************************
        // ****************** Display Options *********************
        // ********************************************************
        JPanel control3 = new InsetPanel(insets);
        control3.setBorder(BorderFactory.createTitledBorder("Display Options"));
        control3.setLayout(new BoxLayout(control3, BoxLayout.Y_AXIS));
        control3.add(Box.createRigidArea(vpad20));
        control3.add(setHiddenCheckBox);
        control3.add(Box.createRigidArea(vpad7));
        control3.add(useFileViewCheckBox);
        control3.add(Box.createRigidArea(vpad7));
        control3.add(useFileSystemViewCheckBox);
        control3.add(Box.createRigidArea(vpad7));
        control3.add(accessoryCheckBox);
        control3.add(Box.createRigidArea(vpad7));
        control3.add(useEmbedInWizardCheckBox);
        control3.add(Box.createRigidArea(vpad7));
        control3.add(useControlsCheckBox);
        control3.add(Box.createRigidArea(vpad7));
        control3.add(enableDragCheckBox);
        control3.add(Box.createRigidArea(vpad20));
        control3.add(Box.createGlue());

        // ********************************************************
        // ************* File & Directory Options *****************
        // ********************************************************
        JPanel control4 = new InsetPanel(insets);
        control4.setBorder(BorderFactory.createTitledBorder("File and Directory Options"));
        control4.setLayout(new BoxLayout(control4, BoxLayout.Y_AXIS));
        control4.add(Box.createRigidArea(vpad20));
        control4.add(justFilesRadioButton);
        control4.add(Box.createRigidArea(vpad7));
        control4.add(justDirectoriesRadioButton);
        control4.add(Box.createRigidArea(vpad7));
        control4.add(bothFilesAndDirectoriesRadioButton);
        control4.add(Box.createRigidArea(vpad20));
        control4.add(singleSelectionRadioButton);
        control4.add(Box.createRigidArea(vpad7));
        control4.add(multiSelectionRadioButton);
        control4.add(Box.createRigidArea(vpad20));
        control4.add(Box.createGlue());


        // ********************************************************
        // **************** Look & Feel Switch ********************
        // ********************************************************
        JPanel panel = new JPanel();
        panel.add(new JLabel("Look and Feel: "));
        panel.add(lafComboBox);
        panel.add(showButton);

        // ********************************************************
        // ****************** Wrap 'em all up *********************
        // ********************************************************
        JPanel wrapper = new JPanel();
        wrapper.setLayout(new BoxLayout(wrapper, BoxLayout.X_AXIS));

        add(Box.createRigidArea(vpad20));

        wrapper.add(Box.createRigidArea(hpad10));
        wrapper.add(Box.createRigidArea(hpad10));
        wrapper.add(control1);
        wrapper.add(Box.createRigidArea(hpad10));
        wrapper.add(control2);
        wrapper.add(Box.createRigidArea(hpad10));
        wrapper.add(control3);
        wrapper.add(Box.createRigidArea(hpad10));
        wrapper.add(control4);
        wrapper.add(Box.createRigidArea(hpad10));
        wrapper.add(Box.createRigidArea(hpad10));

        add(wrapper);
        add(Box.createRigidArea(vpad20));
        add(panel);
        add(Box.createRigidArea(vpad20));
    }

    public void actionPerformed(ActionEvent e) {
        if (customButton.isSelected()) {
            chooser.setApproveButtonText(customField.getText());
        }
        if (chooser.isMultiSelectionEnabled()) {
            chooser.setSelectedFiles(null);
        } else {
            chooser.setSelectedFile(null);
        }
        // clear the preview from the previous display of the chooser
        JComponent accessory = chooser.getAccessory();
        if (accessory != null) {
            ((FilePreviewer)accessory).loadImage(null);
        }

        if (useEmbedInWizardCheckBox.isSelected()) {
            WizardDialog wizard = new WizardDialog(frame, true);
            wizard.setVisible(true);
            wizard.dispose();
            return;
        }

        int retval = chooser.showDialog(frame, null);
        if (retval == APPROVE_OPTION) {
            JOptionPane.showMessageDialog(frame, getResultString());
        } else if (retval == CANCEL_OPTION) {
            JOptionPane.showMessageDialog(frame, "User cancelled operation. No file was chosen.");
        } else if (retval == ERROR_OPTION) {
            JOptionPane.showMessageDialog(frame, "An error occured. No file was chosen.");
        } else {
            JOptionPane.showMessageDialog(frame, "Unknown operation occured.");
        }
    }

    private void resetFileFilters(boolean enableFilters,
                                  boolean showExtensionInDescription) {
        chooser.resetChoosableFileFilters();
        if (enableFilters) {
            FileFilter jpgFilter = createFileFilter("JPEG Compressed Image Files",
                                         showExtensionInDescription, "jpg");
            FileFilter gifFilter = createFileFilter("GIF Image Files",
                                         showExtensionInDescription, "gif");
            FileFilter bothFilter = createFileFilter("JPEG and GIF Image Files",
                                          showExtensionInDescription, "jpg",
                                          "gif");
            chooser.addChoosableFileFilter(bothFilter);
            chooser.addChoosableFileFilter(jpgFilter);
            chooser.addChoosableFileFilter(gifFilter);
        }
    }

    private FileFilter createFileFilter(String description,
            boolean showExtensionInDescription, String...extensions) {
        if (showExtensionInDescription) {
            description = createFileNameFilterDescriptionFromExtensions(
                    description, extensions);
        }
        return new FileNameExtensionFilter(description, extensions);
    }

    private String createFileNameFilterDescriptionFromExtensions(
            String description, String[] extensions) {
        String fullDescription = (description == null) ?
                "(" : description + " (";
        // build the description from the extension list
        fullDescription += "." + extensions[0];
        for (int i = 1; i < extensions.length; i++) {
            fullDescription += ", .";
            fullDescription += extensions[i];
        }
        fullDescription += ")";
        return fullDescription;
    }

    private class WizardDialog extends JDialog implements ActionListener {
        CardLayout cardLayout;
        JPanel cardPanel;
        JLabel messageLabel;
        JButton backButton, nextButton, closeButton;

        WizardDialog(JFrame frame, boolean modal) {
            super(frame, "Embedded JFileChooser Demo", modal);

            cardLayout = new CardLayout();
            cardPanel = new JPanel(cardLayout);
            getContentPane().add(cardPanel, BorderLayout.CENTER);

            messageLabel = new JLabel("", JLabel.CENTER);
            cardPanel.add(chooser, "fileChooser");
            cardPanel.add(messageLabel, "label");
            cardLayout.show(cardPanel, "fileChooser");
            chooser.addActionListener(this);

            JPanel buttonPanel = new JPanel();
            backButton = new JButton("< Back");
            nextButton = new JButton("Next >");
            closeButton = new JButton("Close");

            buttonPanel.add(backButton);
            buttonPanel.add(nextButton);
            buttonPanel.add(closeButton);

            getContentPane().add(buttonPanel, BorderLayout.SOUTH);

            backButton.setEnabled(false);
            getRootPane().setDefaultButton(nextButton);

            backButton.addActionListener(this);
            nextButton.addActionListener(this);
            closeButton.addActionListener(this);

            pack();
            setLocationRelativeTo(frame);
        }

        public void actionPerformed(ActionEvent evt) {
            Object src = evt.getSource();
            String cmd = evt.getActionCommand();

            if (src == backButton) {
                back();
            } else if (src == nextButton) {
                FileChooserUI ui = chooser.getUI();
                if (ui instanceof BasicFileChooserUI) {
                    // Workaround for bug 4528663. This is necessary to
                    // pick up the contents of the file chooser text field.
                    // This will trigger an APPROVE_SELECTION action.
                    ((BasicFileChooserUI)ui).getApproveSelectionAction().actionPerformed(null);
                } else {
                    next();
                }
            } else if (src == closeButton) {
                close();
            } else if (cmd == APPROVE_SELECTION) {
                next();
            } else if (cmd == CANCEL_SELECTION) {
                close();
            }
        }

        private void back() {
            backButton.setEnabled(false);
            nextButton.setEnabled(true);
            cardLayout.show(cardPanel, "fileChooser");
            getRootPane().setDefaultButton(nextButton);
            chooser.requestFocus();
        }

        private void next() {
            backButton.setEnabled(true);
            nextButton.setEnabled(false);
            messageLabel.setText(getResultString());
            cardLayout.show(cardPanel, "label");
            getRootPane().setDefaultButton(closeButton);
            closeButton.requestFocus();
        }

        private void close() {
            setVisible(false);
        }

        public void dispose() {
            chooser.removeActionListener(this);

            // The chooser is hidden by CardLayout on remove
            // so fix it here
            cardPanel.remove(chooser);
            chooser.setVisible(true);

            super.dispose();
        }
    }

    private String getResultString() {
        String resultString;
        String filter = chooser.getFileFilter().getDescription();
        String path = null;
        boolean isDirMode = (chooser.getFileSelectionMode() == DIRECTORIES_ONLY);
        boolean isMulti = chooser.isMultiSelectionEnabled();

        if (isMulti) {
            File [] files = chooser.getSelectedFiles();
            if (files != null && files.length > 0) {
                path = "";
                for (File file : files) {
                    path = path + "<br>" + file.getPath();
                }
            }
        } else {
            File file = chooser.getSelectedFile();
            if (file != null) {
                path = "<br>" + file.getPath();
            }
        }
        if (path != null) {
            path = path.replace(" ", "&nbsp;");
            filter = filter.replace(" ", "&nbsp;");
            resultString =
                "<html>You chose " + (isMulti ? "these" : "this") + " " +
                (isDirMode ? (isMulti ? "directories" : "directory")
                           : (isMulti ? "files" : "file")) +
                ": <code>" + path +
                "</code><br><br>with filter: <br><code>" + filter;
        } else {
            resultString = "Nothing was chosen";
        }
        return resultString;
    }


    /** An ActionListener that listens to the radio buttons. */
    private class OptionListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            JComponent c = (JComponent) e.getSource();
            boolean selected = false;
            if (c instanceof JToggleButton) {
                selected = ((JToggleButton)c).isSelected();
            }

            if (c == openRadioButton) {
                chooser.setDialogType(OPEN_DIALOG);
                customField.setEnabled(false);
                repaint();
            } else if (c == useEmbedInWizardCheckBox) {
                useControlsCheckBox.setEnabled(!selected);
                useControlsCheckBox.setSelected(!selected);
                chooser.setControlButtonsAreShown(!selected);
            } else if (c == useControlsCheckBox) {
                chooser.setControlButtonsAreShown(selected);
            } else if (c == enableDragCheckBox) {
                chooser.setDragEnabled(selected);
            } else if (c == saveRadioButton) {
                chooser.setDialogType(SAVE_DIALOG);
                customField.setEnabled(false);
                repaint();
            } else if (c == customButton || c == customField) {
                customField.setEnabled(true);
                chooser.setDialogType(CUSTOM_DIALOG);
                repaint();
            } else if (c == showAllFilesFilterCheckBox) {
                chooser.setAcceptAllFileFilterUsed(selected);
            } else if (c == showImageFilesFilterCheckBox) {
                resetFileFilters(selected,
                                 showFullDescriptionCheckBox.isSelected());
                showFullDescriptionCheckBox.setEnabled(selected);
            } else if (c == setHiddenCheckBox) {
                chooser.setFileHidingEnabled(!selected);
            } else if (c == accessoryCheckBox) {
                if (selected) {
                    chooser.setAccessory(previewer);
                } else {
                    chooser.setAccessory(null);
                }
            } else if (c == useFileViewCheckBox) {
                if (selected) {
                    chooser.setFileView(fileView);
                } else {
                    chooser.setFileView(null);
                }
            } else if (c == useFileSystemViewCheckBox) {
                if (selected) {
                    chooser.setFileSystemView(fileSystemView);
                } else {
                    // Restore default behaviour
                    chooser.setFileSystemView(FileSystemView.getFileSystemView());
                }
            } else if (c == showFullDescriptionCheckBox) {
                resetFileFilters(showImageFilesFilterCheckBox.isSelected(),
                                 selected);
            } else if (c == justFilesRadioButton) {
                chooser.setFileSelectionMode(FILES_ONLY);
            } else if (c == justDirectoriesRadioButton) {
                chooser.setFileSelectionMode(DIRECTORIES_ONLY);
            } else if (c == bothFilesAndDirectoriesRadioButton) {
                chooser.setFileSelectionMode(FILES_AND_DIRECTORIES);
            } else if (c == singleSelectionRadioButton) {
                if (selected) {
                    chooser.setMultiSelectionEnabled(false);
                }
            } else if (c == multiSelectionRadioButton) {
                if (selected) {
                    chooser.setMultiSelectionEnabled(true);
                }
            } else if (c == lafComboBox) {
                SupportedLaF supportedLaF = ((SupportedLaF)lafComboBox.getSelectedItem());
                LookAndFeel laf = supportedLaF.laf;
                try {
                    UIManager.setLookAndFeel(laf);
                    SwingUtilities.updateComponentTreeUI(frame);
                    if(chooser != null) {
                        SwingUtilities.updateComponentTreeUI(chooser);
                    }
                    frame.pack();
                } catch (UnsupportedLookAndFeelException exc) {
                    // This should not happen because we already checked
                    ((DefaultComboBoxModel)lafComboBox.getModel()).removeElement(supportedLaF);
                }
            }

        }
    }

    private class FilePreviewer extends JComponent implements PropertyChangeListener {
        ImageIcon thumbnail = null;

        public FilePreviewer(JFileChooser fc) {
            setPreferredSize(new Dimension(100, 50));
            fc.addPropertyChangeListener(this);
        }

        public void loadImage(File f) {
            if (f == null) {
                thumbnail = null;
            } else {
                ImageIcon tmpIcon = new ImageIcon(f.getPath());
                if(tmpIcon.getIconWidth() > 90) {
                    thumbnail = new ImageIcon(
                        tmpIcon.getImage().getScaledInstance(90, -1, Image.SCALE_DEFAULT));
                } else {
                    thumbnail = tmpIcon;
                }
            }
        }

        public void propertyChange(PropertyChangeEvent e) {
            String prop = e.getPropertyName();
            if (prop == SELECTED_FILE_CHANGED_PROPERTY) {
                if(isShowing()) {
                    loadImage((File) e.getNewValue());
                    repaint();
                }
            }
        }

        public void paint(Graphics g) {
            if(thumbnail != null) {
                int x = getWidth()/2 - thumbnail.getIconWidth()/2;
                int y = getHeight()/2 - thumbnail.getIconHeight()/2;
                if(y < 0) {
                    y = 0;
                }

                if(x < 5) {
                    x = 5;
                }
                thumbnail.paintIcon(this, g, x, y);
            }
        }
    }

    public static void main(String s[]) {
        /*
           NOTE: By default, the look and feel will be set to the
           Cross Platform Look and Feel (which is currently Metal).
           The user may someday be able to override the default
           via a system property. If you as the developer want to
           be sure that a particular L&F is set, you can do so
           by calling UIManager.setLookAndFeel(). For example, the
           first code snippet below forcibly sets the UI to be the
           System Look and Feel. The second code snippet forcibly
           sets the look and feel to the Cross Platform L&F.

           Snippet 1:
           try {
              UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
           } catch (Exception exc) {
              System.err.println("Error loading L&F: " + exc);
           }

           Snippet 2:
           try {
              UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
           } catch (Exception exc) {
              System.err.println("Error loading L&F: " + exc);
           }
        */

        FileChooserDemo panel = new FileChooserDemo();

        frame = new JFrame("FileChooserDemo");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.getContentPane().add("Center", panel);
        frame.pack();
        frame.setVisible(true);
    }

    private static class InsetPanel extends JPanel {
        Insets i;
        InsetPanel(Insets i) {
            this.i = i;
        }
        public Insets getInsets() {
            return i;
        }
    }
}