Introduction

DEPRECATED API

This documentation describes the legacy Spec API (Codegen) which is deprecated and maintained only for existing code.

For new development:

• Use KComponents instead of @LayoutSpec
• Use Primitive Components instead of @MountSpec
• See Migration Strategies for converting existing Spec components

Support Status: Bug fixes only. No new features will be added to the Spec API.

The documentation for Spec APIs includes the following pages:

• Layout Specs - the logical equivalents of composite views on Android.
• Mount Specs - components that can render views or drawables.
• Dynamic Props - illustrates properties that are applied directly to a View or Drawable and are updated without computing a layout or remounting.
• Accessibility - explains why accessibility is important and how to implement accessibility features, and lists the supported accessibility events of the Style object.
• Sections API - documentation for the Sections API for writing lists.
• Props and TreeProps - the ways you can pass data to components.
• State in Specs - data that is encapsulated and managed within the component and is transparent to its parent.
• Events for Specs - a general-purpose API to connect components with one another.
• Triggering Events with Handles - how to use a Handle to trigger events on components.