class _BasicActionDetectorState extends State<BasicActionDetector> {

  bool _hasFocus = false;

  @override

  Widget build(BuildContext context) {

    return FocusableActionDetector(

      onFocusChange: (value) => setState(() => _hasFocus = value),

      actions: <Type, Action<Intent>>{

        ActivateIntent: CallbackAction<Intent>(onInvoke: (intent) {

          print('Enter or Space was pressed!');

          return null;

        }),

      },

      child: Stack(

        clipBehavior: Clip.none,

        children: [

          FlutterLogo(size: 100),

          // Position focus in the negative margin for a cool effect

          if (_hasFocus)

            Positioned(

                left: -4,

                top: -4,

                bottom: -4,

                right: -4,

                child: _roundedBorder())

        ],

      ),

    );

  }

}