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 java.io.File;
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");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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);
fileChooser.addChoosableFileFilter(filter1);
FileFilter filter2 = new ExtensionFileFilter("gif",
new String[] { "gif" });
fileChooser.addChoosableFileFilter(filter2);
fileChooser.setFileView(new JavaFileView());
int status = fileChooser.showOpenDialog(parent);
if (status == JFileChooser.APPROVE_OPTION) {
File selectedFile = fileChooser.getSelectedFile();
directoryLabel.setText(selectedFile.getParent());
filenameLabel.setText(selectedFile.getName());
} else if (status == JFileChooser.CANCEL_OPTION) {
directoryLabel.setText(" ");
filenameLabel.setText(" ");
}
}
};
button.addActionListener(actionListener);
contentPane.add(button, BorderLayout.CENTER);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
class LabelAccessory extends JLabel implements PropertyChangeListener {
private static final int PREFERRED_WIDTH = 125;
private static final int PREFERRED_HEIGHT = 100;
public LabelAccessory(JFileChooser chooser) {
setVerticalAlignment(JLabel.CENTER);
setHorizontalAlignment(JLabel.CENTER);
chooser.addPropertyChangeListener(this);
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));
}
}
setIcon(icon);
}
}
}
}
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
toLower(this.extensions);
}
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(Color.blue);
Icon classIcon = new DiamondIcon(Color.green);
Icon htmlIcon = new DiamondIcon(Color.red);
Icon jarIcon = new DiamondIcon(Color.pink);
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;
initPolygon();
}
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.setColor(color);
g.translate(x, y);
if (selected) {
g.fillPolygon(poly);
} else {
g.drawPolygon(poly);
}
g.translate(-x, -y);
}
}
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