svoid showDirChooser(File defaultDir, IVF1<File> action) {
  JFileChooser fileChooser = new JFileChooser(defaultDir);
  fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
  fileChooser.setAcceptAllFileFilterUsed(false);

  if (fileChooser.showOpenDialog(tfPath) == JFileChooser.APPROVE_OPTION)     action?.get(fileChooser.getSelectedFile());
}