Flutter ima dva temeljna tipa gradnikov: StatelessWidget (nespremenljiv, brez notranjega stanja, ki se spreminja) in StatefulWidget (lahko drži in posodablja spremenljivo stanje, ponovno se gradi, ko se stanje spremeni). Izbira pravega je temeljnega pomena za gradnjo Flutter uporabniških vmesnikov.
StatelessWidget — brez spremenljivega stanja
// a StatelessWidget: just describes UI based on its inputs (immutable, no internal state)
class Greeting extends StatelessWidget {
final String name;
const Greeting(this.name);
@override
Widget build(BuildContext context) {
return Text('Hello, $name'); // UI depends only on inputs, never changes itself
}
}
// → use for UI that doesn't change on its own (static content, displays based on inputs)
