File Chooser Demo 4 : File Chooser « Swing JFC « Java

File Chooser Demo 4

File Chooser Demo 4
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski     
ISBN: 1-893115-78-X
Publisher: APress

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Polygon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileView;

public class FilterSample {

  public static void main(String args[]) {
    JFrame frame = new JFrame("JFileChooser Filter Popup");
    Container contentPane = frame.getContentPane();

    final JLabel directoryLabel = new JLabel();
    contentPane.add(directoryLabel, BorderLayout.NORTH);

    final JLabel filenameLabel = new JLabel();
    contentPane.add(filenameLabel, BorderLayout.SOUTH);

    final JButton button = new JButton("Open FileChooser");
    ActionListener actionListener = new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        Component parent = (Component) actionEvent.getSource();
        JFileChooser fileChooser = new JFileChooser(".");
        fileChooser.setAccessory(new LabelAccessory(fileChooser));
        FileFilter filter1 = new ExtensionFileFilter(null,
            new String[] { "JPG", "JPEG" });
        //        fileChooser.setFileFilter(filter1);
        FileFilter filter2 = new ExtensionFileFilter("gif",
            new String[] { "gif" });
        fileChooser.setFileView(new JavaFileView());
        int status = fileChooser.showOpenDialog(parent);
        if (status == JFileChooser.APPROVE_OPTION) {
          File selectedFile = fileChooser.getSelectedFile();
        } else if (status == JFileChooser.CANCEL_OPTION) {
          directoryLabel.setText(" ");
          filenameLabel.setText(" ");
    contentPane.add(button, BorderLayout.CENTER);

    frame.setSize(300, 200);

class LabelAccessory extends JLabel implements PropertyChangeListener {
  private static final int PREFERRED_WIDTH = 125;

  private static final int PREFERRED_HEIGHT = 100;

  public LabelAccessory(JFileChooser chooser) {
    setPreferredSize(new Dimension(PREFERRED_WIDTH, PREFERRED_HEIGHT));

  public void propertyChange(PropertyChangeEvent changeEvent) {
    String changeName = changeEvent.getPropertyName();
    if (changeName.equals(JFileChooser.SELECTED_FILE_CHANGED_PROPERTY)) {
      File file = (File) changeEvent.getNewValue();
      if (file != null) {
        ImageIcon icon = new ImageIcon(file.getPath());
        if (icon.getIconWidth() > PREFERRED_WIDTH) {
          icon = new ImageIcon(icon.getImage().getScaledInstance(
              PREFERRED_WIDTH, -1, Image.SCALE_DEFAULT));
          if (icon.getIconHeight() > PREFERRED_HEIGHT) {
            icon = new ImageIcon(icon.getImage().getScaledInstance(
                -1, PREFERRED_HEIGHT, Image.SCALE_DEFAULT));

class ExtensionFileFilter extends FileFilter {
  String description;

  String extensions[];

  public ExtensionFileFilter(String description, String extension) {
    this(description, new String[] { extension });

  public ExtensionFileFilter(String description, String extensions[]) {
    if (description == null) {
      // Since no description, use first extension and # of extensions as
      // description
      this.description = extensions[0] + "{" + extensions.length + "}";
    } else {
      this.description = description;
    this.extensions = (String[]) extensions.clone();
    // Convert array to lowercase
    // Don't alter original entries

  private void toLower(String array[]) {
    for (int i = 0, n = array.length; i < n; i++) {
      array[i] = array[i].toLowerCase();

  public String getDescription() {
    return description;

  // ignore case, always accept directories
  // character before extension must be a period
  public boolean accept(File file) {
    if (file.isDirectory()) {
      return true;
    } else {
      String path = file.getAbsolutePath().toLowerCase();
      for (int i = 0, n = extensions.length; i < n; i++) {
        String extension = extensions[i];
        if ((path.endsWith(extension) && (path.charAt(path.length()
            - extension.length() - 1)) == '.')) {
          return true;
    return false;

class JavaFileView extends FileView {
  Icon javaIcon = new DiamondIcon(;

  Icon classIcon = new DiamondIcon(;

  Icon htmlIcon = new DiamondIcon(;

  Icon jarIcon = new DiamondIcon(;

  public String getName(File file) {
    String filename = file.getName();
    if (filename.endsWith(".java")) {
      String name = filename + " : " + file.length();
      return name;
    return null;

  public String getTypeDescription(File file) {
    String typeDescription = null;
    String filename = file.getName().toLowerCase();

    if (filename.endsWith(".java")) {
      typeDescription = "Java Source";
    } else if (filename.endsWith(".class")) {
      typeDescription = "Java Class File";
    } else if (filename.endsWith(".jar")) {
      typeDescription = "Java Archive";
    } else if (filename.endsWith(".html") || filename.endsWith(".htm")) {
      typeDescription = "Applet Loader";
    return typeDescription;

  public Icon getIcon(File file) {
    if (file.isDirectory()) {
      return null;
    Icon icon = null;
    String filename = file.getName().toLowerCase();
    if (filename.endsWith(".java")) {
      icon = javaIcon;
    } else if (filename.endsWith(".class")) {
      icon = classIcon;
    } else if (filename.endsWith(".jar")) {
      icon = jarIcon;
    } else if (filename.endsWith(".html") || filename.endsWith(".htm")) {
      icon = htmlIcon;
    return icon;

class DiamondIcon implements Icon {
  private Color color;

  private boolean selected;

  private int width;

  private int height;

  private Polygon poly;

  private static final int DEFAULT_WIDTH = 10;

  private static final int DEFAULT_HEIGHT = 10;

  public DiamondIcon(Color color) {
    this(color, true, DEFAULT_WIDTH, DEFAULT_HEIGHT);

  public DiamondIcon(Color color, boolean selected) {
    this(color, selected, DEFAULT_WIDTH, DEFAULT_HEIGHT);

  public DiamondIcon(Color color, boolean selected, int width, int height) {
    this.color = color;
    this.selected = selected;
    this.width = width;
    this.height = height;

  private void initPolygon() {
    poly = new Polygon();
    int halfWidth = width / 2;
    int halfHeight = height / 2;
    poly.addPoint(0, halfHeight);
    poly.addPoint(halfWidth, 0);
    poly.addPoint(width, halfHeight);
    poly.addPoint(halfWidth, height);

  public int getIconHeight() {
    return height;

  public int getIconWidth() {
    return width;

  public void paintIcon(Component c, Graphics g, int x, int y) {
    g.translate(x, y);
    if (selected) {
    } else {
    g.translate(-x, -y);


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