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/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly
*/
// MyFilterChooser.java
//Just a simple example to see what it takes to make one of these filters work.
//
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.filechooser.FileFilter;
public class MyFilterChooser extends JFrame {
public MyFilterChooser() {
super("Filter Test Frame");
setSize(350, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
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) {
String[] pics = new String[] { "gif", "jpg", "tif" };
String[] audios = new String[] { "au", "aiff", "wav" };
JFileChooser chooser = new JFileChooser();
chooser.addChoosableFileFilter(new SimpleFileFilter(pics,
"Images (*.gif, *.jpg, *.tif)"));
chooser.addChoosableFileFilter(new SimpleFileFilter(".MOV"));
chooser.addChoosableFileFilter(new SimpleFileFilter(audios,
"Sounds (*.aiff, *.au, *.wav)"));
int option = chooser.showOpenDialog(MyFilterChooser.this);
if (option == JFileChooser.APPROVE_OPTION) {
if (chooser.getSelectedFile() != null)
statusbar.setText("You chose "
+ chooser.getSelectedFile().getName());
} else {
statusbar.setText("You canceled.");
}
}
});
c.add(openButton);
c.add(statusbar);
setVisible(true);
}
public static void main(String args[]) {
MyFilterChooser mfc = new MyFilterChooser();
}
}
//SimpleFileFilter.java
//A straightforward extension-based example of a file filter. This should be
//replaced by a "first class" Swing class in a later release of Swing.
//
class SimpleFileFilter extends FileFilter {
String[] extensions;
String description;
public SimpleFileFilter(String ext) {
this(new String[] { ext }, null);
}
public SimpleFileFilter(String[] exts, String descr) {
// Clone and lowercase the extensions
extensions = new String[exts.length];
for (int i = exts.length - 1; i >= 0; i--) {
extensions[i] = exts[i].toLowerCase();
}
// Make sure we have a valid (if simplistic) description
description = (descr == null ? exts[0] + " files" : descr);
}
public boolean accept(File f) {
// We always allow directories, regardless of their extension
if (f.isDirectory()) {
return true;
}
// Ok, it's a regular file, so check the extension
String name = f.getName().toLowerCase();
for (int i = extensions.length - 1; i >= 0; i--) {
if (name.endsWith(extensions[i])) {
return true;
}
}
return false;
}
public String getDescription() {
return description;
}
}
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