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/*
* Copyright (c) 2010-2021 Haifeng Li. All rights reserved.
*
* Smile 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.
*
* Smile is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Smile. If not, see .
*/
package smile.swing;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Collection;
import java.util.TreeSet;
import javax.imageio.ImageIO;
import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.UIManager;
import javax.swing.filechooser.FileFilter;
/**
* File chooser for with file/images preview. A simple file filter based on
* file extensions is also provided.
*
* @author Haifeng Li
*/
@SuppressWarnings("serial")
public class FileChooser extends JFileChooser {
private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(FileChooser.class);
/**
* Shared file chooser. An application should have only one file chooser
* so that it always points to the recent directory.
*/
private static FileChooser chooser = new FileChooser();
/**
* Constructor.
*/
public FileChooser() {
// Add the preview pane.
setAccessory(new FilePreview(this));
}
/**
* Returns the shared file chooser instance. In general, an application
* should have only one file chooser so that it always points to the recent
* directory.
*/
public static FileChooser getInstance() {
return chooser;
}
class FilePreview extends JComponent implements PropertyChangeListener {
/**
* The image of selected file.
*/
BufferedImage img = null;
/**
* The selected file.
*/
File file = null;
/**
* A buffer to hold file header.
*/
char[] buf = new char[1024];
/**
* Font for header text.
*/
Font font = (Font) UIManager.get("Label.font");
/**
* Font metrics.
*/
FontMetrics fm = getFontMetrics(font);
/**
* Color for header text.
*/
Color color = (Color) UIManager.get("Label.foreground");
/**
* Text file header.
*/
String header = null;
/**
* Constructor.
*/
public FilePreview(JFileChooser fc) {
setPreferredSize(new Dimension(160, 160));
fc.addPropertyChangeListener(this);
}
/**
* Loads the image or the beginning part of a text file.
*/
public void loadPreview() {
if (file == null) {
img = null;
header = null;
return;
}
if (!file.exists()) return;
if (SimpleFileFilter.readableImageFilter.accept(file)) {
try {
img = ImageIO.read(file);
} catch (IOException ex) {
logger.error("Failed to read image {}", file, ex);
}
} else {
try {
FileReader reader = new FileReader(file);
int len = reader.read(buf, 0, buf.length);
reader.close();
boolean binary = false;
for (int i = 0; i < len; i++) {
if (buf[i] >= 0 && buf[i] < 0x1F) {
if (buf[i] != 0x09 && // tab
buf[i] != 0x0A && // line feed
buf[i] != 0x0C && // form feed
buf[i] != 0x0D) { // carriage return)
binary = true;
break;
}
}
}
if (!binary) {
header = new String(buf, 0, len);
}
} catch (IOException ex) {
logger.error("Failed to read file {}", file, ex);
}
}
}
@Override
public void propertyChange(PropertyChangeEvent e) {
boolean update = false;
String prop = e.getPropertyName();
if (JFileChooser.DIRECTORY_CHANGED_PROPERTY.equals(prop)) {
// If the directory changed, don't show an image.
file = null;
update = true;
} else if (JFileChooser.SELECTED_FILE_CHANGED_PROPERTY.equals(prop)) {
// If a file became selected, find out which one.
file = (File) e.getNewValue();
update = true;
}
// Update the preview accordingly.
if (update) {
img = null;
header = null;
if (isShowing()) {
loadPreview();
repaint();
}
}
}
@Override
protected void paintComponent(Graphics g) {
if (img == null || header == null) {
loadPreview();
}
if (img != null) {
Graphics2D g2d = (Graphics2D) g;
if (getWidth() < img.getWidth() || getHeight() < img.getHeight()) {
int x = (getWidth() - img.getWidth()) / 2;
int y = (getHeight() - img.getHeight()) / 2;
if (x < 5) x = 5;
if (y < 5) y = 5;
int width = getWidth() - 2 * x;
int height = getHeight() - 2 * y;
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.drawImage(img, x, y, width, height, null);
} else {
int x = (getWidth() - img.getWidth()) / 2;
int y = (getHeight() - img.getHeight()) / 2;
g2d.drawImage(img, x, y, null);
}
}
if (header != null) {
Graphics2D g2d = (Graphics2D) g;
g2d.setFont(font);
g2d.setColor(color);
// Watch the margins
Insets insets = getInsets();
// Set the starting position to draw
int x = insets.left;
int y = insets.top;
if (x < 5) x = 5;
if (y < 5) y = 5;
int begin = 0;
int end = header.indexOf('\n', begin);
if (end == -1) end = header.length();
while (begin >= 0 && begin < header.length()) {
// Move down to baseline
y += fm.getAscent();
if (y >= getHeight()) {
break;
}
g2d.drawString(header.substring(begin, end), x, y);
begin = end + 1;
end = header.indexOf('\n', begin);
if (end == -1) end = header.length();
// Move down to top of next line
y += fm.getDescent() + fm.getLeading();
}
}
}
}
/**
* Returns the file name extension in lower case.
* @param f a file.
* @return the file name extension in lower case.
*/
public static String getExtension(File f) {
String ext = null;
String s = f.getName();
int i = s.lastIndexOf('.');
if (i > 0 && i < s.length() - 1) {
ext = s.substring(i + 1).toLowerCase();
}
return ext;
}
/**
* A simple extension-based file filter. Accept all directories and known
* file extensions. Extensions are typically found on Windows and Unix,
* but not on Macinthosh. Case is ignored.
*/
public static class SimpleFileFilter extends FileFilter {
/**
* Filter for readable image formats.
*/
private static SimpleFileFilter readableImageFilter;
/**
* Filter for writable image formats.
*/
private static SimpleFileFilter writableImageFilter;
static {
readableImageFilter = new SimpleFileFilter("Readable Images", ImageIO.getReaderFormatNames());
writableImageFilter = new SimpleFileFilter("Writable Images", ImageIO.getWriterFormatNames());
}
/**
* The file extensions in lower case.
*/
private TreeSet filters = new TreeSet<>();
/**
* The human readable description of this filter.
*/
private String description = null;
/**
* The human readable description of this filter with the list of
* file extensions.
*/
private String fullDescription = null;
/**
* Creates a file filter that accepts the given file type.
*
* Note that the "." before the extension is not needed. If
* provided, it will be ignored.
*/
public SimpleFileFilter(String description, String extension) {
if (description != null) {
setDescription(description);
}
if (extension != null) {
addExtension(extension);
}
}
/**
* Creates a file filter from the given string array and description.
*
* Note that the "." before the extension is not needed and will be ignored.
*/
public SimpleFileFilter(String description, String... filters) {
if (description != null) {
setDescription(description);
}
for (int i = 0; i < filters.length; i++) {
// add filters one by one
addExtension(filters[i]);
}
}
/**
* Creates a file filter from the given string array and description.
*
* Note that the "." before the extension is not needed and will be ignored.
*/
public SimpleFileFilter(String description, Collection filters) {
if (description != null) {
setDescription(description);
}
for (String extension : filters) {
// add filters one by one
addExtension(extension);
}
}
/**
* Returns the filter for readable images.
*/
public static SimpleFileFilter getReadableImageFilter() {
return readableImageFilter;
}
/**
* Returns the filter for writable images.
*/
public static SimpleFileFilter getWritableImageFIlter() {
return writableImageFilter;
}
@Override
public boolean accept(File f) {
if (f != null) {
if (f.isDirectory()) {
return true;
}
String extension = getExtension(f);
if (extension != null) {
return filters.contains(extension);
}
}
return false;
}
/**
* Adds a file type "dot" extension to filter against.
* Note that the "." before the extension is not needed and will be ignored.
*/
public void addExtension(String extension) {
filters.add(extension.toLowerCase());
fullDescription = null;
}
/**
* Returns the human readable description of this filter.
*/
@Override
public String getDescription() {
if (fullDescription == null) {
fullDescription = description == null ? "(" : description + " (";
// build the description from the extension list
for (String extension : filters) {
fullDescription += "." + extension;
}
fullDescription += ")";
}
return fullDescription;
}
/**
* Sets the human readable description of this filter.
*/
public void setDescription(String description) {
this.description = description;
fullDescription = null;
}
}
}
