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| public class JListExemple extends JPanel {
private File folder;
private JList<File> jlist;
private DefaultListModel<File> listModel;
public JListExemple() {
super(new BorderLayout());
JButton button = new JButton("Choisir dossier");
button.addActionListener(e -> selectFolder());
JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
buttonPanel.add(button);
add(buttonPanel, BorderLayout.SOUTH);
listModel = new DefaultListModel<>();
jlist = new JList<>(listModel);
jlist.setCellRenderer(new FileRenderer());
add(new JScrollPane(jlist), BorderLayout.CENTER);
selectFolder(new File(System.getProperty("java.home")));
}
private void selectFolder() {
JFileChooser chooser = new JFileChooser(folder);
chooser.setDialogTitle("Choisir dossier");
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
if (chooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION && chooser.getSelectedFile().isDirectory()) {
selectFolder(chooser.getSelectedFile());
}
}
private void selectFolder(File selectedFile) {
File[] files = selectedFile.listFiles(File::isFile);
listModel.removeAllElements();
if (files != null) {
Arrays.sort(files);
for (File file : files) {
listModel.addElement(file);
}
}
}
private static class FileRenderer extends JPanel implements ListCellRenderer<File> {
private static final Border DEFAULT_FOCUS_BORDER =
BorderFactory.createEtchedBorder(EtchedBorder.LOWERED);
private ImagePanel imagePanel;
private TextPanel textPanel;
private OtherPanel otherPanel;
private boolean ready;
private ImageCache imageCache;
public FileRenderer() {
this.setOpaque(true);
this.setBorder(DEFAULT_FOCUS_BORDER);
this.setName("List.cellRenderer");
setLayout(new BorderLayout());
imageCache = new ImageCache();
imagePanel = new ImagePanel(imageCache);
textPanel = new TextPanel();
otherPanel = new OtherPanel();
ready=true;
imagePanel.setFont(getFont());
textPanel.setFont(getFont());
otherPanel.setFont(getFont());
imagePanel.setForeground(getForeground());
textPanel.setForeground(getForeground());
otherPanel.setForeground(getForeground());
imagePanel.setBackground(getBackground());
textPanel.setBackground(getBackground());
otherPanel.setBackground(getBackground());
}
@Override
public void setBackground(Color color) {
super.setBackground(color);
if ( ready ) {
imagePanel.setBackground(color);
textPanel.setBackground(color);
otherPanel.setBackground(color);
}
}
@Override
public void setForeground(Color color) {
super.setForeground(color);
if ( ready ) {
imagePanel.setForeground(color);
textPanel.setForeground(color);
otherPanel.setForeground(color);
}
}
@Override
public void setEnabled(boolean enabled) {
super.setEnabled(enabled);
imagePanel.setEnabled(enabled);
textPanel.setEnabled(enabled);
otherPanel.setEnabled(enabled);
}
@Override
public void setFont(Font font) {
super.setFont(font);
if ( ready ) {
imagePanel.setFont(font);
textPanel.setFont(font);
otherPanel.setFont(font);
}
}
public void setFile(File file) {
String mimeType = MimetypesFileTypeMap.getDefaultFileTypeMap().getContentType(file.getName());
imageCache.drop();
removeAll();
if ( mimeType.startsWith("text/") ) {
textPanel.setFile(file);
add(textPanel);
}
else if ( mimeType.startsWith("image/") ) {
imagePanel.setFile(file);
add(imagePanel);
}
else {
otherPanel.setFile(file);
add(otherPanel);
}
}
@Override
public Component getListCellRendererComponent(JList<? extends File> jlist, File value, int index,
boolean isSelected, boolean cellHasFocus) {
setFile(value);
Color background;
Color foreground;
UIDefaults defaults = javax.swing.UIManager.getDefaults();
JList.DropLocation dropLocation = jlist.getDropLocation();
if (dropLocation != null && !dropLocation.isInsert() && dropLocation.getIndex() == index) {
background = defaults.getColor("List.dropCellBackground");
foreground = defaults.getColor("List.dropCellForeground");
} else if (isSelected) {
background = jlist.getSelectionBackground();
foreground = jlist.getSelectionForeground();
} else {
background = jlist.getBackground();
foreground = jlist.getForeground();
}
setBackground(background);
setForeground(foreground);
setEnabled(jlist.isEnabled());
setFont(jlist.getFont());
Border focusBorder = null;
if (cellHasFocus) {
if (isSelected) {
focusBorder = defaults.getBorder("List.focusSelectedCellHighlightBorder");
}
if (focusBorder == null) {
focusBorder = defaults.getBorder("List.focusCellHighlightBorder");
}
} else {
focusBorder = DEFAULT_FOCUS_BORDER;
}
this.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createMatteBorder(1, 1, 0, 1, new Color(0,0,0,0)),focusBorder));
return this;
}
}
private static abstract class AbstractPanel extends JPanel {
private JLabel label;
public AbstractPanel() {
super(new BorderLayout());
label = new JLabel();
add(label, BorderLayout.NORTH);
setFont(getFont());
label.setForeground(getForeground());
label.setBackground(getBackground());
}
@Override
public void setFont(Font font) {
super.setFont(font);
if ( label!=null ) {
label.setFont(font.deriveFont(Font.BOLD));
}
}
@Override
public void setEnabled(boolean enabled) {
super.setEnabled(enabled);
label.setEnabled(enabled);
}
@Override
public void setBackground(Color background) {
if ( label!=null ) {
super.setBackground(background);
}
}
@Override
public void setForeground(Color foreground) {
super.setForeground(foreground);
if ( label!=null ) {
label.setForeground(foreground);
}
}
public void setFile(File file) {
String name = file.getName();
Icon icon = FileSystemView.getFileSystemView().getSystemIcon(file);
if (name.length()>32 ) {
name = name.substring(0,32) + "\u2026";
}
label.setText(name);
label.setIcon(icon);
showAbstract(file);
}
protected abstract void showAbstract(File file);
}
private static class ImagePanel extends AbstractPanel {
private BufferedImage image;
private JPanel panel;
private ImageCache imageCache;
public ImagePanel(ImageCache imageCache) {
this.imageCache=imageCache;
panel = new JPanel() {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if ( image!=null ) {
double r;
if ( image.getWidth()<image.getHeight() ) {
r = image.getHeight()*1d/getHeight();
}
else {
r = image.getWidth()*1d/getWidth();
}
double width = image.getWidth()/r;
double height = image.getHeight()/r;
g.drawImage(image,(int)( (getWidth()-width)/2),(int)( (getHeight()-height)/2), (int)width, (int)height, null);
}
else {
g.setColor(getForeground());
g.drawLine(0, 0, getWidth(), getHeight());
g.drawLine(0, getHeight(), getWidth(), 0);
}
}
};
panel.setPreferredSize(new Dimension(64,64));
panel.setMaximumSize(new Dimension(64,64));
add(panel,BorderLayout.CENTER);
setFont(getFont());
panel.setForeground(getForeground());
panel.setBackground(getBackground());
}
@Override
public void setFont(Font font) {
super.setFont(font);
if ( panel!=null ) {
panel.setFont(font);
}
}
@Override
public void setEnabled(boolean enabled) {
super.setEnabled(enabled);
panel.setEnabled(enabled);
}
@Override
public void setBackground(Color background) {
if ( panel!=null ) {
super.setBackground(background);
}
}
@Override
public void setForeground(Color foreground) {
super.setForeground(foreground);
if ( panel!=null ) {
panel.setForeground(foreground);
}
}
@Override
protected void showAbstract(File file) {
image = imageCache.get(file);
}
}
private static class TextPanel extends AbstractPanel {
private JTextArea textarea;
public TextPanel() {
textarea = new JTextArea();
textarea.setLineWrap(true);
textarea.setWrapStyleWord(true);
textarea.setEditable(false);
add(textarea,BorderLayout.CENTER);
textarea.setForeground(getForeground());
textarea.setBackground(getBackground());
}
@Override
public void setFont(Font font) {
super.setFont(font);
if ( textarea!=null ) {
textarea.setFont(font.deriveFont(Font.PLAIN));
}
}
@Override
public void setEnabled(boolean enabled) {
super.setEnabled(enabled);
textarea.setEnabled(enabled);
}
@Override
public void setBackground(Color background) {
if ( textarea!=null ) {
super.setBackground(background);
}
}
@Override
public void setForeground(Color foreground) {
super.setForeground(foreground);
if ( textarea!=null ) {
textarea.setForeground(foreground);
}
}
@Override
protected void showAbstract(File file) {
try(BufferedReader reader=Files.newBufferedReader(file.toPath())) {
textarea.read(reader, file.getName());
} catch (IOException e) {
textarea.setText("");
}
float estsize = textarea.getLineCount()*textarea.getFont().getSize2D();
textarea.setPreferredSize(new Dimension(64,(int)Math.min(estsize,128)));
}
}
private static class OtherPanel extends AbstractPanel {
@Override
protected void showAbstract(File file) {
}
}
private static class ImageCache {
private Map<File, BufferedImage> map;
public ImageCache() {
map = new HashMap<>();
}
public void drop() {
map.clear();
}
public BufferedImage get(File file) {
return map.computeIfAbsent(file, this::loadImage);
}
private BufferedImage loadImage(File file) {
try {
return ImageIO.read(file);
} catch (IOException e) {
return null;
}
}
}
public static void main(String[] args) {
JFrame frame = new JFrame("Démo");
frame.add(new JListExemple());
frame.setSize(300, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
} |
