A file view that displays an icon for all files that match a file filter : File Chooser « Swing JFC « Java

A file view that displays an icon for all files that match a file filter

A file view that displays an icon for all files that match a file filter
   This program is a part of the companion code for Core Java 8th ed.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;

import javax.swing.BorderFactory;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.filechooser.FileView;

 * @version 1.23 2007-06-12
 * @author Cay Horstmann
public class FileChooserTest
   public static void main(String[] args)
      EventQueue.invokeLater(new Runnable()
            public void run()
               ImageViewerFrame frame = new ImageViewerFrame();

 * A frame that has a menu for loading an image and a display area for the loaded image.
class ImageViewerFrame extends JFrame
   public ImageViewerFrame()

      // set up menu bar
      JMenuBar menuBar = new JMenuBar();

      JMenu menu = new JMenu("File");

      JMenuItem openItem = new JMenuItem("Open");
      openItem.addActionListener(new FileOpenListener());

      JMenuItem exitItem = new JMenuItem("Exit");
      exitItem.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent event)

      // use a label to display the images
      label = new JLabel();

      // set up file chooser
      chooser = new JFileChooser();

      // accept all image files ending with .jpg, .jpeg, .gif
      final ExtensionFileFilter filter = new ExtensionFileFilter();
      filter.setDescription("Image files");
      FileNameExtensionFilter filter = new FileNameExtensionFilter("Image files", "jpg", "jpeg", "gif");

      chooser.setAccessory(new ImagePreviewer(chooser));

      chooser.setFileView(new FileIconView(filter, new ImageIcon("palette.gif")));

    * This is the listener for the File->Open menu item.
   private class FileOpenListener implements ActionListener
      public void actionPerformed(ActionEvent event)
         chooser.setCurrentDirectory(new File("."));

         // show file chooser dialog
         int result = chooser.showOpenDialog(ImageViewerFrame.this);

         // if image file accepted, set it as icon of the label
         if (result == JFileChooser.APPROVE_OPTION)
            String name = chooser.getSelectedFile().getPath();
            label.setIcon(new ImageIcon(name));

   public static final int DEFAULT_WIDTH = 300;
   public static final int DEFAULT_HEIGHT = 400;

   private JLabel label;
   private JFileChooser chooser;

 * A file view that displays an icon for all files that match a file filter.
class FileIconView extends FileView
    * Constructs a FileIconView.
    * @param aFilter a file filter--all files that this filter accepts will be shown with the icon.
    * @param anIcon--the icon shown with all accepted files.
   public FileIconView(FileFilter aFilter, Icon anIcon)
      filter = aFilter;
      icon = anIcon;

   public Icon getIcon(File f)
      if (!f.isDirectory() && filter.accept(f)) return icon;
      else return null;

   private FileFilter filter;
   private Icon icon;

 * A file chooser accessory that previews images.
class ImagePreviewer extends JLabel
    * Constructs an ImagePreviewer.
    * @param chooser the file chooser whose property changes trigger an image change in this
    * previewer
   public ImagePreviewer(JFileChooser chooser)
      setPreferredSize(new Dimension(100, 100));

      chooser.addPropertyChangeListener(new PropertyChangeListener()
            public void propertyChange(PropertyChangeEvent event)
               if (event.getPropertyName() == JFileChooser.SELECTED_FILE_CHANGED_PROPERTY)
                  // the user has selected a new file
                  File f = (File) event.getNewValue();
                  if (f == null)

                  // read the image into an icon
                  ImageIcon icon = new ImageIcon(f.getPath());

                  // if the icon is too large to fit, scale it
                  if (icon.getIconWidth() > getWidth()) icon = new ImageIcon(icon.getImage()
                        .getScaledInstance(getWidth(), -1, Image.SCALE_DEFAULT));



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