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transient sclass JGallery is Swingable {
  L<File> files;
  gettable File selectedFile;
  settable bool horizontal = true;

  simplyCached DynamicStack buttons() {
    ret horizontal ? makeNiceButtons() : verticalNiceButtons();
  }

  simplyCached ButtonImageLoader imageLoader() {
    ret new ButtonImageLoader(buttons());
  }
  
  void setImageFiles(Cl<File> filesCollection) swing {
    var files = asList(filesCollection);
    if (eq(this.files, files)) ret;
    this.files = files;
    printVars("JGallery.setImageFiles", n2(files));
    L<TextImageAction> l = filesForNiceButtons(files, lambda1 openImage);
    replaceNiceButtons(buttons(), l);
    File selectedFile = selectedFile();
    //buttonGroup = buttonGroupForAllButtons(buttons());
    selectFile(selectedFile);
    imageLoader().update();
  }
  
  void selectFile(File file) swing {
    selectedFile = file;
    int idx = indexOf(files, file);
    for (int i, JButton btn : unpair iterateWithIndex(allButtons(buttons()))) {
      bool selected = i == idx;
      setSelected(btn, selected);
      if (selected) {
        print("Selected button: " + btn);
        scrollIntoView(btn);
      }
    }
  }
  
  cachedVisual jHigherScrollPane(jfullcenter(buttons()));
  
  swappable void openImage(File f) { showImage(f); }
}