FileSample.java Source code

Introduction

Here is the source code for FileSample.java

Source

/*
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.FileView;

public class FileSample {

    public static void main(String args[]) {
        JFrame frame = new JFrame("JFileChooser 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));
                FileView view = new JavaFileView();
                fileChooser.setFileView(view);
                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 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);
    }
}