!7

sclass DirectoryInfo extends DynModule {
  S dir;
  bool allowedToLook, exists, isFile;
  L<S> filesContained;
  
  File dirObject() { ret newFile(dir); }
  
  JComponent visualize() {
    if (dir == null)
      ret jcenteredbutton("Select directory...", r {
        selectFile("Select directory to show", voidfunc(File dir) {
          setField(dir := f2s(dir));
          revisualize();
        });
      });
      
    ret makeForm(+dir, +allowedToLook, +exists, +isFile, "Files contained", l(filesContained));
  }
  
  void update {
    if (dir != null && allowedToLook) {
      File dirObject = dirObject();
      setField(exists := dirObject.isDirectory());
      setField(isFile := dirObject.isFile());
      if (filesContained == null)
        setField(filesContained := listFileNames(dirObject));
    }
  }
}