!7

sclass DynSCP extends DynModule {
  SingleComponentPanel scp;
  
  final JComponent visualize() { ret scp = singleComponentPanel(visualize2()); }
  void unvisualize2() { scp = null; }
  JComponent visualize2() { null; }
}

sclass LastImagesInDirectory extends DynModule {
  /*DirectoryInfo*/O mate;
  S dir;
  L<S> allFiles, imageFiles;
  
  transient DynamicHStack stack;

  File dirObject() { ret newFile(dir); }
  
  JComponent visualize2() {
    if (mate == null) ret jcenteredlabel("Need directory");
    ret jHigherScrollPane(jfullcenter(stack = makeNiceButtons());
  }
  
  void update {
    lock lock;
    if (mate == null)
      mate = dm_findMateOfType(this, 'DirectoryInfo);
    if (mate == null) ret;
    setField(dir := (S) call(mate, 'getDir));
    L<S> allFiles = castCall(mate, 'getFiles);
    if (this.allFiles != allFiles) {
      setField(this, +allFiles);
      if (setField(imageFiles := filterOrNull(allFiles, f isImageFileName)))
        revisualize();
    }
  }
}