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
*/
// MyViewChooser.java
//An example that uses custom file views to show thumbnails of graphic files
//rather than the regular file icon. (see ThumbnailFileView.java)
//
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 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.FileView;
import javax.swing.plaf.metal.MetalIconFactory;
public class MyViewChooser extends JFrame {
JFrame parent;
public MyViewChooser() {
super("File View Test Frame");
setSize(350, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
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.");
}
}
});
c.add(openButton);
c.add(statusbar);
}
public static void main(String args[]) {
System.setProperty("swing.defaultlaf",
"javax.swing.plaf.metal.MetalLookAndFeel");
MyViewChooser vc = new MyViewChooser();
vc.setVisible(true);
}
}
//ThumbNailFileView.java
//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) {
super(f);
Image i = observer.createImage(16, 16);
i.getGraphics().drawImage(getImage(), 0, 0, 16, 16, observer);
setImage(i);
}
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);
}
}
}
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