beaConcept BInput {
  S text;
  
  toString { ret "[\*id*/] Input " + quote(text); }
}

beaConcept BOutput {
  S text;
  
  toString { ret "[\*id*/] Output " + quote(text); }
}

asclass DynBEAReactor_textInOut > DynBEAReactor {
  S input, output;
  
  transient JPanel inputButtons;

  visual
    jvsplit(0.2, jhsplit(jCenteredSection("Input",
      centerAndSouth(dm_wordWrapTextArea input(), withMargin(inputButtons = jRightAlignedButtons(
        "Load input", rThreadEnter loadInput,
        "Load & process", rThreadEnter loadAndProcess)))),
      dm_wordWrapTextAreaAsSection output()),
      super);


  @Override bool hasOutput() { ret hasConcept(BOutput); }
  
  void loadInput {
    setField(output := "");
    deleteReactors();
    deleteConcepts(BInput);
    uniq BInput(text := input);
  }
  
  void loadAndProcess {
    loadInput();
    reactUntilOutput();
  }
}

Began life as a copy of #1030762