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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_meshfnibkhmdkr0ep52ig45fnh, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
!7

sclass DirectoryInfo extends DynModule {
  S dir;
  bool allowedToLook;
  Bool exists, isFile;
  L<S> filesContained; // this should be an immutable list b/c of listeners
  
  transient JComboBox comboBox;
  
  File dirObject() { ret newFile(dir); }
  
  void start {
    ownTimer(doEvery(2.0, r fullUpdate)); // TODO: watch service
  }
  
  JComponent visualize() {
    if (dir == null)
      ret jcenteredbutton("Select directory...", r {
        selectFile("Select directory to show", voidfunc(File dir) {
          setField(dir := f2s(dir));
          revisualize();
        });
      });
      
    if (comboBox == null)
      comboBox = yesNoComboBox(allowedToLook,
        voidfunc(bool b) { setField(allowedToLook := b) });
        
    ret makeForm(
      "Directory" := dir,
      allowedToLook := comboBox,
      +exists,
      +isFile,
      "Files contained", filesContained == null ? "Unknown" : l(filesContained));
  }
  
  void fullUpdate { lock lock; filesContained = null; update(); }
  
  void update {
    lock lock;
    if (dir != null && allowedToLook) {
      File dirObject = dirObject();
      setField(exists := dirObject.isDirectory());
      setField(isFile := dirObject.isFile());
      if (filesContained == null
        && setField(filesContained := listFileNames(dirObject)))
          revisualize();
    } else
      if (setFields(exists := null, isFile := null, filesContained := null)) revisualize();
  }
  
  // API for other modules
  S getDir() { ret dir; }
  L<S> getFiles() { ret filesContained; }
}