# Li Lance Android Seraphim Framework Flutter Widgets

> UI & Widgets

- Skill: `tomevault-io/li-lance-android-seraphim-framework-flutter-widgets` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/li-lance-android-seraphim-framework-flutter-widgets`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/li-lance-android-seraphim-framework-flutter-widgets/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/li-lance-android-seraphim-framework-flutter-widgets

---


# UI & Widgets

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

Standards for building reusable, performant Flutter widgets and UI components.

- **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`.
- **Widget Keys**: All interactive elements must use keys from `widget_keys.dart`.
- **File Size**: If a UI file exceeds ~80 lines, extract sub-widgets into private classes.
- **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`.

```dart
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));
}
```

## Anti-Patterns

- ❌ `setState(() { _orders = await repo.fetch(); })` — server/shared state belongs in a BLoC, not
  widget state
- ❌ Widget file over 80 lines without extracting private sub-widget classes — helper methods
  returning `Widget` are not a substitute
- ❌ `Key('submit-button')` inline in widget code — all keys must be constants defined in
  `widget_keys.dart`
- ❌ `Widget _buildHeader() { … }` helper methods — extract to a `const` `StatelessWidget` private
  class for proper rebuilding control

## Related Topics

performance | testing

---
> Source: [li-lance/android-seraphim-framework](https://github.com/li-lance/android-seraphim-framework) — distributed by [TomeVault](https://tomevault.io).
<!-- tomevault:4.0:skill_md:2026-06-16 -->