abstract sclass DynPrintLog extends DynModule {
  transient JTextArea ta;
  
  JComponent visualize() {
    singleTimer(doEvery(1000, r updatePrintLog));
    ret jSection("Log", ta = moveCaretToEnd(typeWriterTextArea(localPrintLog())));
  }
  
  void updatePrintLog {
    // TODO: optimize
    if (ta != null) setText(ta, localPrintLog());
  }
}