What is StatelessWidget?

Learn that StatelessWidget has no internal state.

What is StatelessWidget?

A StatelessWidget is a widget whose internal state does not change after creation. It produces its appearance solely from data passed via constructor parameters. It suits static content like clocks, labels and info cards. The build method is only re-called when the parameters change.

class Selam extends StatelessWidget {
  const Selam({super.key});

  @override
  Widget build(BuildContext context) {
    return Text('Merhaba');
  }
}

Stateless vs Stateful

StatelessWidget has no state; StatefulWidget has state. In a stateless widget data only arrives via the constructor and never changes; in a stateful widget variables inside the State object update with user interaction and build is called again. A counter is stateful; a title is stateless.

// Stateless: data comes from constructor
class Etiket extends StatelessWidget {
  final String metin;
  const Etiket({super.key, required this.metin});

  @override
  Widget build(BuildContext context) {
    return Text(metin);
  }
}

Exercise Print stateless info

In main, print two lines with print: stateless statik and build gorunum.

Show example solution

void main() {
  print('stateless statik');
  print('build gorunum');
}

Test yourself

When is StatelessWidget preferred?
- Only for animated widgets
- For widgets exchanging data with a server
- Only for static views based on constructor params
- For widgets with constantly changing state
Show answer

Only for static views based on constructor params — StatelessWidget is for widgets without state that rely only on constructor params; data that changes like a counter requires StatefulWidget.

Stateless class definition

class Selam extends ____ {
  @override
  Widget build(BuildContext context) {
    return Text('Selam');
  }
}

Show answer

class Selam extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Text('Selam');
  }
}

StatelessWidget concepts

StatelessWidget

Stateless widget class
değişmez örnek

Not updated outside constructor
no state

No internal data stored
statik görünüm

Suitable for StatelessWidget

Next lesson: The build method

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