flutter-ui

# Flutter UI Optimization Guide for GreenLeaf E-commerce

## Performance Best Practices
- **Widget Reuse**: Replace `Container` with `const` constructors where possible. For example:
  ```dart
  const ProductCard(/*...*/)  // Instead of dynamic Container
  ```
- **State Management**: Use `Provider` or `Riverpod` for complex state instead of `setState` in deep widgets
- **List Views**: Implement `ListView.builder` with estimated item heights for scrollable product listings

## Theming Strategy
- **Dark/Light Mode**: Create a `ThemeData` extension:
  ```dart
  extension ThemeX on BuildContext {
    ThemeData get theme => Theme.of(this);
    Color get primary => theme.colorScheme.primary;
  }
  ```
- **Typography**: Define text themes in `MaterialApp`:
  ```dart
  theme: ThemeData(
    textTheme: TextTheme(
      headlineSmall: TextStyle(fontSize: 16, fontWeight: FontWeight.bold)
    )
  )
  ```

## Reusable Components
- **Card Templates**: Create a `BaseCard` widget with configurable padding and shadows
- **Button Library**: Standardize primary/secondary buttons with consistent elevation
- **Animation Helpers**: Implement reusable `FadeIn`/`SlideIn` widgets for page transitions

## Key Metrics to Monitor
- FPS: Target 60fps for smooth scrolling
- Memory: Keep widget tree under 200 active widgets
- Bundle Size: Optimize assets with `flutter build apk --split-debug-info`