Is there an existing issue for this?

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Use case

I'm extending the FormFieldState class to create a custom type of form. I've overridden the save method to call another method in the codebase, whenever save is triggered from the wrapping Form. I only want to call this other method if the field has been interacted with.

FormField has a private flag for this, _hasInteractedByUser, which could provide the required information. A way to currently solve this is to override didChange and reset to keep track of my own boolean flag.

Proposal

I would like FormFieldState to expose a boolean getter for the value of _hasInteractedByUser. I see two cases in which this could be useful.

1. When accessing the FormFieldState via a key.

final key = GlobalKey<FormFieldState<String>>;

TextFormField(
  key: key,
),

final changed = key.currentState!.hasInteractedByUser;

2. When extending FormFieldState.

@override
void save() {
  super.save();
  if(hasInteractedByUser) {
    doSomethingAwesome();
  }
}