SignalRadioGroup<T> class

A reactive group of radio buttons for single-value selection, bound to a Field<T>.

Each SignalFieldOption in options renders as a Radio + label pair wrapped in a Material RadioGroup. Selecting an option writes its value to field.value and calls Field.touch. The Field.error is surfaced inside the InputDecorator once the field is touched.

T is the type of the selected value. field is the backing Field<T>. options is the ordered list of SignalFieldOption items to display. decoration wraps the group with a Material InputDecoration; the error text is driven by Field.error once touched. orientation — Axis.vertical stacks options top-to-bottom (default); Axis.horizontal wraps them in a Wrap side-by-side. activeColor overrides the selected radio button fill color. focusColor overrides the focus ring color. hoverColor overrides the hover ring color. splashRadius overrides the ink splash radius on tap. visualDensity adjusts the spacing around each radio button. enabled — when false, all radio buttons are disabled. focusNode overrides the internally managed FocusNode.

Example:

final gender = Field<String>('gender')
  ..required(message: 'Selecione uma opção');

SignalRadioGroup<String>(
  field: gender,
  decoration: const InputDecoration(labelText: 'Gênero'),
  options: const [
    SignalFieldOption(value: 'M', label: 'Masculino'),
    SignalFieldOption(value: 'F', label: 'Feminino'),
    SignalFieldOption(value: 'O', label: 'Outro'),
  ],
)