registerOnChange method

@override void registerOnChange(ChangeFunction<T> callback)

Set the function to be called when the control receives a change event.

NOTE: This function should only be called by view (i.e. user-initiated) changes. Incorrect implementation of registerOnChange will cause issues such as the control incorrectly being marked as dirty from a model update.

Implementation

@override
void registerOnChange(callback) {
  disposer.addStreamSubscription(_updateStream.listen((_) {
    if (input == null) return;
    final rawValue = input.inputText;
    final value = parseNumber(rawValue);
    if (value != null) {
      callback(value, rawValue: rawValue);
    }
  }));
}