show thumbnails of graphic files : File Chooser « Swing JFC « Java

show thumbnails of graphic files

show thumbnails of graphic files
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
//An example that uses custom file views to show thumbnails of graphic files
//rather than the regular file icon. (see

import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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.FileView;
import javax.swing.plaf.metal.MetalIconFactory;

public class MyViewChooser extends JFrame {
  JFrame parent;

  public MyViewChooser() {
    super("File View Test Frame");
    setSize(350, 200);
    parent = this;

    Container c = getContentPane();
    c.setLayout(new FlowLayout());

    JButton openButton = new JButton("Open");
    final JLabel statusbar = new JLabel(
        "Output of your selection will go here");

    openButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        JFileChooser chooser = new JFileChooser();

        // Ok, set up our own file view for the chooser
        chooser.setFileView(new ThumbNailFileView(MyViewChooser.this));

        int option = chooser.showOpenDialog(parent);
        if (option == JFileChooser.APPROVE_OPTION) {
          statusbar.setText("You chose "
              + chooser.getSelectedFile().getName());
        } else {
          statusbar.setText("You cancelled.");


  public static void main(String args[]) {
    MyViewChooser vc = new MyViewChooser();

//A simple implementation of the FileView class that provides a 16x16 image of
//each GIF or JPG file for its icon. This could be SLOW for large images, as we
//simply load the real image and then scale it.

class ThumbNailFileView extends FileView {

  private Icon fileIcon = MetalIconFactory.getTreeLeafIcon();

  private Icon folderIcon = MetalIconFactory.getTreeFolderIcon();

  private Component observer;

  public ThumbNailFileView(Component c) {
    // We need a component around to create our icon's image
    observer = c;

  public String getDescription(File f) {
    // We won't store individual descriptions, so just return the
    // type description.
    return getTypeDescription(f);

  public Icon getIcon(File f) {
    // Is it a folder?
    if (f.isDirectory()) {
      return folderIcon;

    // Ok, it's a file, so return a custom icon if it's an image file
    String name = f.getName().toLowerCase();
    if (name.endsWith(".jpg") || name.endsWith(".gif")) {
      return new Icon16(f.getAbsolutePath());

    // Return the generic file icon if it's not
    return fileIcon;

  public String getName(File f) {
    String name = f.getName();
    return name.equals("") ? f.getPath() : name;

  public String getTypeDescription(File f) {
    String name = f.getName().toLowerCase();
    if (f.isDirectory()) {
      return "Folder";
    if (name.endsWith(".jpg")) {
      return "JPEG Image";
    if (name.endsWith(".gif")) {
      return "GIF Image";
    return "Generic File";

  public Boolean isTraversable(File f) {
    // We'll mark all directories as traversable
    return f.isDirectory() ? Boolean.TRUE : Boolean.FALSE;

  public class Icon16 extends ImageIcon {
    public Icon16(String f) {
      Image i = observer.createImage(16, 16);
      i.getGraphics().drawImage(getImage(), 0, 0, 16, 16, observer);

    public int getIconHeight() {
      return 16;

    public int getIconWidth() {
      return 16;

    public void paintIcon(Component c, Graphics g, int x, int y) {
      g.drawImage(getImage(), x, y, c);


Related examples in the same category

1.JFileChooser is a standard dialog for selecting a file from the file system.
2.A demo which makes extensive use of the file chooserA demo which makes extensive use of the file chooser
3.Demonstration of File dialog boxesDemonstration of File dialog boxes
4.JFileChooser class in action with an accessoryJFileChooser class in action with an accessory
5.A simple file chooser to see what it takes to make one of these workA simple file chooser to see what it takes to make one of these work
6.see what it takes to make one of these filters worksee what it takes to make one of these filters work
7.FileChooser file filter customized filechooserFileChooser file filter customized filechooser
8.Choose a FileChoose a File
9.Customizing a JFileChooserCustomizing a JFileChooser
10.A simple FileFilter class that works by filename extension
11.Swing File Chooser DemoSwing File Chooser Demo
12.FileChooser DemoFileChooser Demo
13.File Chooser Demo 2File Chooser Demo 2
14.File Chooser Demo 4File Chooser Demo 4
15.Getting the File-Type Icon of a File
16.Getting the Large File-Type Icon of a File
17.Listening for Approve and Cancel Events in a JFileChooser Dialog
18.String javax.swing.JFileChooser.APPROVE_SELECTION
19.void javax.swing.JFileChooser.addActionListener(ActionListener l)
20.JDialog javax.swing.JFileChooser.createDialog(Component parent)
21.void javax.swing.JFileChooser.setDialogType(int dialogType)
22.Changing the Text of the Approve Button in a JFileChooser Dialog
23.Determining If a File Is Hidden
24.Showing Hidden Files in a JFileChooser Dialog
25.Enabling Multiple Selections in a JFileChooser Dialog
26.Listening for Changes to the Selected File in a JFileChooser Dialog
27.Getting the File-Type Name of a File
28.Getting and Setting the Selected File of a JFileChooser Dialog
29.Getting and Setting the Current Directory of a JFileChooser Dialog
30.Determining If the Approve or Cancel Button Was Clicked in a JFileChooser Dialog
31.Adding a Filter to a File Chooser Dialog
32.Displaying Only Directories in a File Chooser Dialog
33.Creating a JFileChooser Dialog
34.Localize a JFileChooser
35.Select a directory with a JFileChooser
36.Disable the JFileChooser's "New folder" button
37.Validate a filename from a JFileChooser
38.extends FileView to create custom File chooser
39.Suffix FileFilter
40.Extension File Filter
41.Files filter that filters files by their suffix (or extension)
42.Generic File Filter
43.Get Directory Choice
44.Get File Choice
45.A file view that displays an icon for all files that match a file filterA file view that displays an icon for all files that match a file filter
46.Dir File Filter extends javax.swing.filechooser.FileFilter