feat: Phase 1.5 Extensibility Foundation #2
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- WidgetRegistry with thread-safe registration/creation - WidgetFactory pattern for dynamic widget instantiation - init() auto-registration support for third-party packages - Custom errors: ErrWidgetNotFound, ErrWidgetExists, etc. - 100% test coverage
- LayoutAlgorithm interface for pluggable layout computation - LayoutTree interface for tree traversal - LayoutRegistry with thread-safe registration - Built-in layouts: Flex, VStack, HStack, ZStack, Grid - Style struct with CSS-like properties - 89.5% test coverage
- ColorPalette with semantic colors and Material 3 inspired palette - Typography scale: Display, Headline, Title, Body, Label variants - SpacingScale with XS/S/M/L/XL/XXL values - ShadowStyles with 6 elevation levels - RadiusScale for consistent border radii - ThemeMode: Light, Dark, System preference - DefaultLight() and DefaultDark() presets - Extensions map for future ThemeExtension support (UI-042) - 100% test coverage
…-042) - ThemeExtension interface: Name, Merge, Lerp, CopyWith - Thread-safe typedExtensions storage with sync.RWMutex - Generic ExtensionAs[T] for type-safe retrieval - Theme methods: RegisterExtension, TypedExtension, MergeExtensions, LerpExtensions - Helper functions: LerpString, LerpFloat32, LerpInt - Flutter-inspired pattern for enterprise extensibility - 100% test coverage
- ThemeRegistry with thread-safe registration/retrieval - ThemeInfo metadata: Name, Description, Author, Version, Variants - ThemeVariant type: Light, Dark, System - Built-in themes: light, dark, high-contrast, purple, green, orange - Package-level functions: Register, Get, MustGet, List, Info, ListByVariant - init() auto-registration for built-in themes - 100% test coverage
- Plugin interface: Name, Version, Dependencies, Init, Shutdown - PluginManager with lifecycle management - Dependency resolution with topological sort - Circular dependency detection - Semver version constraint checking (=, >=, <=, >, <, ranges) - PluginContext providing access to Widget, Theme, Layout registries - AssetLoader interface with MemoryAssetLoader implementation - Global functions: Register, Initialize, Shutdown, List, Info - 99.4% test coverage
- Add Phase 1.5 Extensibility section to CHANGELOG - Update README with new packages and architecture - Update ROADMAP to show Phase 1.5 as complete - Create docs/EXTENSIONS.md for community extensions
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Summary
Complete implementation of Phase 1.5 Extensibility Foundation, enabling community to create custom widgets, themes, layouts, and plugins.
New Packages
registry/layout/theme/plugin/Documentation
docs/EXTENSIONS.md— Comprehensive guide for creating extensionsTasks Completed
Statistics
Test plan
go test ./...)golangci-lint run)go fmt)