submit method
Implementation
Future<bool> submit([
Future<void> Function(Map<String, dynamic> values)? onSubmit,
]) async {
trigger();
if (_isSubmitting || !isValid) return false;
_isSubmitting = true;
notifyListeners();
try {
await (onSubmit ?? _formOnSubmit)?.call(getValues());
return true;
} finally {
_isSubmitting = false;
notifyListeners();
}
}