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| public class DemoPanel extends JPanel {
private final JTextField[] fields;
private final JButton[] buttonsPaste;
private final JButton[] buttonsShow;
private File lastDir;
private JButton clearAllButton;
public DemoPanel(int nbRows) {
super(new GridBagLayout());
fields = new JTextField[nbRows];
buttonsPaste = new JButton[nbRows];
buttonsShow = new JButton[nbRows];
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets=new Insets(2, 2, 2, 2);
for(int i=0; i<nbRows; i++) {
gbc.gridy=i;
// label
JLabel label = new JLabel("Champ " + (i+1) + " : ");
gbc.gridx=0;
gbc.anchor=GridBagConstraints.EAST;
gbc.fill=GridBagConstraints.NONE;
gbc.weightx=0;
add(label, gbc);
// field
JTextField field = new JTextField();
label.setLabelFor(field);
gbc.gridx=1;
gbc.anchor=GridBagConstraints.CENTER;
gbc.fill=GridBagConstraints.HORIZONTAL;
gbc.weightx=1;
add(field, gbc);
fields[i]=field;
// button1
JButton buttonPaste = new JButton("Paste");
gbc.gridx=2;
gbc.anchor=GridBagConstraints.CENTER;
gbc.fill=GridBagConstraints.NONE;
gbc.weightx=0;
add(buttonPaste, gbc);
buttonPaste.addActionListener(e-> pasteTo(field));
buttonsPaste[i]=buttonPaste;
// button2
JButton buttonShow = new JButton("Show");
gbc.gridx=3;
gbc.anchor=GridBagConstraints.CENTER;
gbc.fill=GridBagConstraints.NONE;
gbc.weightx=0;
add(buttonShow, gbc);
int index=i;
buttonShow.addActionListener(e-> showImage(index));
buttonShow.setEnabled(false);
buttonsShow[i]=buttonShow;
//
field.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void removeUpdate(DocumentEvent e) {
changedUpdate(e);
}
@Override
public void insertUpdate(DocumentEvent e) {
changedUpdate(e);
}
@Override
public void changedUpdate(DocumentEvent e) {
buttonShow.setEnabled(!field.getText().trim().isEmpty());
boolean enabled = false ;
for(JTextField field : fields) {
if ( !field.getText().isEmpty() ) {
enabled = true;
break;
}
}
clearAllButton.setEnabled(enabled);
}
});
}
clearAllButton = new JButton("Clear all fields");
gbc.gridx=2;
gbc.gridy=-1;
gbc.gridwidth=2;
gbc.anchor=GridBagConstraints.CENTER;
gbc.fill=GridBagConstraints.HORIZONTAL;
gbc.weightx=0;
add(clearAllButton, gbc);
clearAllButton.addActionListener(e->clearAllFields());
clearAllButton.setEnabled(false);
}
private void clearAllFields() {
for(JTextField field : fields) {
field.setText("");
}
}
private void showImage(int index) {
JTextField field = fields[index];
String text = field.getText();
if ( !text.trim().isEmpty() ) {
File file = new File(text);
if ( file.exists() ) {
try {
BufferedImage image = ImageIO.read(file);
int width = image.getWidth();
int height = image.getHeight();
Image fimage;
float scale = -1;
if ( width>300 || height>300 ) {
scale = 300f/Math.max(width, height);
fimage = image.getScaledInstance((int)(width*scale), (int)(height*scale), Image.SCALE_SMOOTH);
}
else {
fimage = image;
}
JPanel imagePanel = new JPanel(new BorderLayout());
JLabel imageLabel = new JLabel(new ImageIcon(fimage));
imagePanel.add(imageLabel, BorderLayout.NORTH);
Map<String, String> prop = new LinkedHashMap<>();
prop.put("Largeur×Hauteur, en pixels : ", width + " × " + height );
prop.put("Fichier : ", file.getName());
prop.put("Emplacement : ", file.getParentFile().getAbsolutePath().toString() );
prop.put("Taille fichier, en octets : ", String.valueOf(file.length()) );
if ( scale>0 ) {
prop.put("Echelle d'affichage : ", NumberFormat.getPercentInstance().format(scale) );
}
JTable proptable = new JTable(new AbstractTableModel() {
@Override
public Object getValueAt(int row, int col) {
for(Map.Entry<String, String> entry : prop.entrySet() ) {
if ( row==0 ) {
if ( col==1 ) {
return entry.getValue();
}
else {
return entry.getKey();
}
}
row--;
}
return null;
}
@Override
public Class<?> getColumnClass(int col) {
return String.class;
}
@Override
public String getColumnName(int col) {
if ( col==1 ) {
return "Valeur";
}
else {
return "Nom";
}
}
@Override
public int getRowCount() {
return prop.size();
}
@Override
public int getColumnCount() {
return 2;
}
});
JScrollPane scrollPane = new JScrollPane(proptable);
proptable.setFillsViewportHeight(true);
proptable.setPreferredScrollableViewportSize(new Dimension(500,75));
imagePanel.add(scrollPane, BorderLayout.CENTER);
JOptionPane.showMessageDialog(this, imagePanel, "Image " + (index+1), JOptionPane.INFORMATION_MESSAGE);
} catch (IOException e) {
JOptionPane.showMessageDialog(this, "Impossible de visualiser l'image.\n\nFormat non supporté ou erreur de lecture.", "Erreur", JOptionPane.ERROR_MESSAGE);
}
}
else {
JOptionPane.showMessageDialog(this, "Impossible de visualiser l'image.\n\nFichier " + file.getName() + " non trouvé.\n\nChemin complet : " + file.getAbsolutePath(), "Erreur", JOptionPane.ERROR_MESSAGE);
}
}
}
private void pasteTo(JTextField field) {
JFileChooser chooser = new JFileChooser(lastDir);
chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
chooser.setMultiSelectionEnabled(false);
chooser.setFileFilter(new FileFilter() {
@Override
public boolean accept(File f) {
return f.isDirectory() || isImageExtension(f.getName());
}
@Override
public String getDescription() {
return "Fichier image";
}
});
chooser.setDialogTitle("Choisir une image");
if ( chooser.showOpenDialog(this)==JFileChooser.APPROVE_OPTION ) {
File selected = chooser.getSelectedFile();
if ( selected.exists() && isImageExtension(selected.getName()) ) {
field.setText(selected.toString());
}
lastDir = selected.getParentFile();
}
}
private boolean isImageExtension(String name) {
return MimetypesFileTypeMap.getDefaultFileTypeMap().getContentType(name).startsWith("image/");
}
public static void main(String[] args) {
JFrame frame = new JFrame("Démo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new DemoPanel(10));
frame.setSize(640, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
} |
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