first commit

ui/src/FileSelectionPanel.java

@@ -0,0 +1,159 @@
+import javax.swing.*;
+import java.awt.*;
+import java.io.File;
+import java.util.List;
+
+public final class FileSelectionPanel extends JPanel {
+
+    private final DefaultListModel<File> fileModel;
+    private final JList<File> fileList;
+
+    public FileSelectionPanel() {
+        super(new BorderLayout(8, 8));
+
+        fileModel = new DefaultListModel<>();
+        fileList = new JList<>(fileModel);
+
+        fileList.setCellRenderer((list, file, index, selected, focus) -> {
+            String name = file.getName();
+
+            if (name.isEmpty()) {
+                name = file.getAbsolutePath();
+            }
+
+            JLabel label = new JLabel(
+                name + " — " + getFileSize(file)
+            );
+
+            label.setOpaque(true);
+            label.setBorder(
+                BorderFactory.createEmptyBorder(6, 8, 6, 8)
+            );
+
+            if (selected) {
+                label.setBackground(list.getSelectionBackground());
+                label.setForeground(list.getSelectionForeground());
+            } else {
+                label.setBackground(list.getBackground());
+                label.setForeground(list.getForeground());
+            }
+
+            return label;
+        });
+
+        JButton addFilesButton = new JButton("Añadir archivos");
+        JButton addFolderButton = new JButton("Añadir carpeta");
+        JButton removeButton = new JButton("Quitar selección");
+
+        addFilesButton.addActionListener(event -> selectFiles());
+        addFolderButton.addActionListener(event -> selectFolder());
+        removeButton.addActionListener(event -> removeSelectedFiles());
+
+        JPanel buttons = new JPanel(
+            new FlowLayout(FlowLayout.LEFT)
+        );
+
+        buttons.add(addFilesButton);
+        buttons.add(addFolderButton);
+        buttons.add(removeButton);
+
+        add(buttons, BorderLayout.NORTH);
+        add(new JScrollPane(fileList), BorderLayout.CENTER);
+    }
+
+    private void selectFiles() {
+        JFileChooser chooser = new JFileChooser();
+
+        chooser.setMultiSelectionEnabled(true);
+        chooser.setFileSelectionMode(
+            JFileChooser.FILES_ONLY
+        );
+
+        int result = chooser.showOpenDialog(this);
+
+        if (result == JFileChooser.APPROVE_OPTION) {
+            for (File file : chooser.getSelectedFiles()) {
+                addFile(file);
+            }
+        }
+    }
+
+    private void selectFolder() {
+        JFileChooser chooser = new JFileChooser();
+
+        chooser.setFileSelectionMode(
+            JFileChooser.DIRECTORIES_ONLY
+        );
+
+        int result = chooser.showOpenDialog(this);
+
+        if (result == JFileChooser.APPROVE_OPTION) {
+            addFile(chooser.getSelectedFile());
+        }
+    }
+
+    private void addFile(File file) {
+        if (!file.exists()) {
+            return;
+        }
+
+        for (int i = 0; i < fileModel.size(); i++) {
+            if (fileModel.get(i).equals(file)) {
+                return;
+            }
+        }
+
+        if (file.getName().toLowerCase().endsWith(".lbt")) {
+            JOptionPane.showMessageDialog(
+                this,
+                "No se pueden añadir archivos .lbt para comprimir.",
+                "Archivo no permitido",
+                JOptionPane.WARNING_MESSAGE
+            );
+
+            return;
+        }
+
+        fileModel.addElement(file);
+    }
+
+    private void removeSelectedFiles() {
+        List<File> selectedFiles = fileList.getSelectedValuesList();
+
+        for (File file : selectedFiles) {
+            fileModel.removeElement(file);
+        }
+    }
+
+    private String getFileSize(File file) {
+        if (file.isDirectory()) {
+            return "Carpeta";
+        }
+
+        long bytes = file.length();
+
+        if (bytes < 1024) {
+            return bytes + " B";
+        }
+
+        if (bytes < 1024 * 1024) {
+            return String.format("%.1f KB", bytes / 1024.0);
+        }
+
+        if (bytes < 1024L * 1024 * 1024) {
+            return String.format(
+                "%.1f MB",
+                bytes / (1024.0 * 1024.0)
+            );
+        }
+
+        return String.format(
+            "%.2f GB",
+            bytes / (1024.0 * 1024.0 * 1024.0)
+        );
+    }
+
+    public List<File> getSelectedFiles() {
+        return fileList.getSelectedValuesList();
+    }
+}