UI & Widgets (P1)

• State: Use StatelessWidget by default. StatefulWidget only for local state/controllers.
• Composition: Extract UI into small, atomic const widgets.
• Theming: Use Theme.of(context). No hardcoded colors.
• Layout: Use Flex + Gap/SizedBox.
• Specialized:

- SelectionArea: For multi-widget text selection. - InteractiveViewer: For zoom/pan. - ListWheelScrollView: For pickers. - IntrinsicWidth/Height: Avoid unless strictly required.

• Large Lists: Always use ListView.builder.

class AppButton extends StatelessWidget {
  final String label;
  final VoidCallback onPressed;
  const AppButton({super.key, required this.label, required this.onPressed});

  @override
  Widget build(BuildContext context) => ElevatedButton(onPressed: onPressed, child: Text(label));
}

Related Topics

performance | testing