kotlin-composable-preview

Development

Generate comprehensive @Preview functions for Jetpack Compose composables. Analyzes component parameters, states, and dependencies to create previews covering all visual states, edge cases, and configurations.

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Kotlin Composable Preview Generator

Skill for generating production-quality @Preview functions for Jetpack Compose UI components.

When to Use

Adding previews to new Composable functions
Enhancing existing previews with more state coverage
Creating previews for components with sealed class states
Generating multi-configuration previews (light/dark, device sizes)

Preview Categories

Simple Preview - Basic single-state preview
Multi-State Preview - Separate @Preview for each state (sealed class, enum)
Variant Preview - Column/Row showing all variants in one preview
Interactive Preview - Using PreviewParameter for data-driven previews
Configuration Preview - Device, font scale, UI mode configurations

Generation Workflow

Analyze Composable signature
- Extract parameters (required/optional)
- Identify state classes (data class, sealed class, enum)
- Find callback parameters (lambdas)
Identify preview requirements
- Check for HazeState dependency → needs hazeSource setup
- Check for modifier patterns → use appropriate sizing
- Check for sealed class states → generate preview for each subtype
Generate previews
- Follow naming: {ComposableName}Preview, {ComposableName}{State}Preview
- Use private modifier for preview functions
- Add dark background wrapper when needed
- Provide realistic sample data

Preview Patterns Reference

See references/preview-patterns.md for detailed examples.

Output Guidelines

Aspect	Guideline
Naming	`{ComposableName}Preview`, `{ComposableName}{State}Preview`
Visibility	`private` for preview functions
Background	Use `Box(Modifier.background(Black))` for dark-themed components
HazeState	Use `rememberHazeState()` + `hazeSource()` setup
Callbacks	Use empty lambdas `{}` for onClick, onDismiss
Sample Data	Use realistic Vietnamese text when appropriate

Quality Checklist

All sealed class/enum states have dedicated previews
Required parameters have realistic sample values
Preview renders correctly in Android Studio
Dark backgrounds used for dark-themed components
HazeState properly configured when needed
Proper imports added