Adapts the {@link ValueBoxBase} interface to the Editor framework. This adapter uses {@link ValueBoxBase#getValueOrThrow()} to report parse errors to the Editor framework.

@param <T> the type of value to be edited

class ValueBoxEditor<T> extends TakesValueEditor<T> implements HasEditorDelegate<T> {
 /**
  * Returns a new TakesValueEditor that adapts a {@link ValueBoxBase}
  * instance.
  *
  * @param valueBox a {@link ValueBoxBase} instance to adapt
  * @return a ValueBoxEditor instance of the same type as the
  *   adapted {@link ValueBoxBase} instance
  */
 factory ValueBoxEditor.of(ValueBoxBase valueBox) {
   return new ValueBoxEditor(valueBox);
 }

 EditorDelegate<T> _delegate;
 ValueBoxBase<T> _peer;
 T _value;

 /**
  * Constructs a new ValueBoxEditor that adapts a {@link ValueBoxBase} peer
  * instance.
  *
  * @param peer a {@link ValueBoxBase} instance of type T
  */
 ValueBoxEditor(ValueBoxBase peer) : super(peer) {
   this._peer = peer;
 }

 /**
  * Returns the {@link EditorDelegate} for this instance.
  *
  * @return an {@link EditorDelegate}, or {@code null}
  * @see #setDelegate(EditorDelegate)
  */
 EditorDelegate<T> getDelegate() {
   return _delegate;
 }

 /**
  * Calls {@link ValueBoxBase#getValueOrThrow()}. If a {@link ParseException}
  * is thrown, it will be available through
  * {@link com.google.gwt.editor.client.EditorError#getUserData()
  * EditorError.getUserData()}.
  *
  * @return a value of type T
  * @see #setValue(Object)
  */
 T getValue() {
   try {
     _value = _peer.getValueOrThrow();
   } on Exception catch (e) {
     // TODO i18n
     getDelegate().recordError("Bad value (${_peer.text})", _peer.text, e);
   }
   return _value;
 }

 /**
  * Sets the {@link EditorDelegate} for this instance. This method is only
  * called by the driver.
  *
  * @param delegate an {@link EditorDelegate}, or {@code null}
  * @see #getDelegate()
  */
 void setDelegate(EditorDelegate<T> delegate) {
   this._delegate = delegate;
 }

 void setValue(T value, [bool fireEvents = false]) {
   _peer.setValue(this._value = value);
 }
}