Comment écrire une condition if dans la propriété du widget ?

Je souhaite utiliser la condition if dans le widget d’icône, mais Dart donne une erreur. Comment l’utiliser correctement ? Merci.

class Cell extends StatelessWidget {
  const Cell({super.key, this.caseTrend = false});

  final bool caseTrend;

  @override
  Widget build(BuildContext context) {
    return Container(
      alignment: Alignment.center,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          const Text("23.410"),
          Icon(
          if(caseTrend) { //<== getting error here: Expected an identifier.dart Expected to find ')'.
            Icons.trending_up,
            color: Colors.green,
          } 
          else
          {
            Icons.trending_down,
            color: Colors.red,
          },
            size: 24, 
          )
        ],
      ),
    );
  }
}

Ce que j’ai essayé :

class Cell extends StatelessWidget {
  const Cell({super.key, this.caseTrend = false});

  final bool caseTrend;

  @override
  Widget build(BuildContext context) {
    return Container(
      alignment: Alignment.center,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          const Text("23.410"),
          Icon( //This way working well but using conditions two times
           caseTrend ? Icons.trending_up : Icons.trending_down, 
           color: caseTrend ? Colors.green : Colors.red,
            size: 24, 
          )
        ],
      ),
    );
  }
}