name: Idiomatic Flutter description: Modern layout and widget composition standards. metadata: labels: [flutter, clean-code, widgets] triggers: files: ['lib/presentation/**/*.dart'] keywords: [context.mounted, SizedBox, Gap, composition, shrink]

Idiomatic Flutter (P1)

• Async Gaps: Check if (context.mounted) before using BuildContext after await.
• Composition: Extract complex UI into small widgets. Avoid deep nesting or large helper methods.
• Layout:
  • Spacing: Use Gap(n) or SizedBox over Padding for simple gaps.
  • Empty UI: Use const SizedBox.shrink().
  • Intrinsic: Avoid IntrinsicWidth/Height; use Stack + FractionallySizedBox for overlays.
• Optimization: Use ColoredBox/Padding/DecoratedBox instead of Container when possible.
• Themes: Use extensions for Theme.of(context) access.