flutter-idiomatic-flutter

Included with Lifetime

$97 forever

Compose modern Flutter layouts and widgets idiomatically. Use when composing widget trees, managing layout constraints, or following idiomatic Flutter patterns.

General

What this skill does

# Idiomatic Flutter

## **Priority: P1 (OPERATIONAL)**

- **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: Prefer `spacing` parameter on `Row`/`Column` (Flutter 3.10+) over inserting `SizedBox`/`Gap` between children.
  - Fallback: Use `Gap(n)` or `SizedBox` only when `spacing` cannot express the layout (e.g., conditional gaps).
  - Empty UI: Use `const SizedBox.shrink()`.
  - Intrinsic: Avoid `IntrinsicWidth/Height`; use `Stack` + `FractionallySizedBox` for overlays.
  - Spacing: Use `Gap(n)` or `SizedBox` over `Padding` for simple gaps.
  - Optimization: Use `ColoredBox`/`Padding`/`DecoratedBox` instead of `Container` when possible.
  - Themes: Use extensions for `Theme.of(context)` access.

## Anti-Patterns

- **No BuildContext after await without mounted check**: Check `context.mounted` to prevent crashes across async gaps.
- **No _buildXxx() helper methods**: Extract to `const StatelessWidget` for proper rebuild control.
- **No direct controller access in widget**: Use BLoC or Signals to decouple UI from state.
- **No Container for empty space**: Use `const SizedBox.shrink()`.

Files: 2

Size: 3.5 KB

Complexity: 13/100

Category: General

Source: https://github.com/hoangnguyen0403/agent-skills-standard/tree/main/skills/flutter/flutter-idiomatic-flutter

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