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!7

sclass LastImagesInDirectory extends DynSCP {
  new DynModuleRef mate;
  S dir;
  L<S> allFiles, imageFiles;
  
  transient DynamicHStack buttons;
  transient ButtonImageLoader imageLoader;

  File dirObject() { ret newFile(dir); }
  
  JComponent visualize2() {
    if (buttons == null) { buttons = makeNiceButtons(); updateButtons(); }
    if (imageLoader == null) imageLoader = new ButtonImageLoader(buttons);
    if (mate! == null) ret jcenteredlabel("Need directory");
    ret jHigherScrollPane(jfullcenter(buttons));
  }
  
  void update {
    lock lock;
    int oldChangeCount = mate! == null ? -1 : changeCount;
    try {
      if (mate! != null && !dm_moduleStillThere(mate!)) mate.set(null);
      if (mate! == null)
        if (setField(mate := DynModuleRef(print("Mate: ", dm_findMateOfType(this, 'DirectoryInfo)))))
          revisualize2();
      if (mate == null) ret;
      setField(dir := (S) call(mate!, 'getDir));
      L<S> allFiles = castCall(mate!, 'getFiles);
      if (this.allFiles != allFiles) {
        setField(+allFiles);
        setField(imageFiles := filterOrNull(allFiles, f isImageFileName));
      }
    } finally {
      if (changeCount != oldChangeCount) updateButtons();
    }
  }
  
  void updateButtons {
    if (dir == null || buttons == null) ret with setModuleName("Images in directory");
    L<TextImageAction> l = filesForNiceButtons(sortFilesByDate(
      fileNamesInDirToFile(new File(dir), imageFiles)), f showImage);
    for (final TextImageAction tia : l)
      tia.popupMenuMaker = voidfunc(JPopupMenu menu) {
        final File f = filesForNiceButtons_map.get(tia);
        if (f != null && !hasJPEGExtension(f))
          addMenuItem(menu, "Convert to JPEG (save space by lossy compression)", r-thread { jpegify(f) });
      };
    replaceNiceButtons(buttons, l);
    setModuleName(imageFiles == null
      ? "Not allowed to look in directory " + fileName(dirObject())
      : n2(l, "image") + " in directory " + fileName(dirObject()));
    if (imageLoader != null) imageLoader.update();
  }
}