Module traits 

The backend roles, plus the Bindable trait declaring a component as a property-bus participant.

Each role is a trait a caller drives without naming an implementation. A WindowBackend runs the app and drives a Renderer and an A11yBackend through their traits; a LayoutEngine installs the systems that solve layout. Implementations register themselves into the registry of their kind (see crate::backends), and the launch picks from there.

Re-exports

pub use crate::task::Spawn;

pub use crate::task::Timer;

Structs

A11yBridgeFactory

Builds the accessibility bridge for a window once the window exists.

FrameRequest

What the caller knows about the frame it is asking for.

Enums

FrameTarget

Where a Renderer puts its frames.

RenderError

Why a renderer could not bind to its target or put a frame on it.

WindowError

Why a window backend could not run the app.

Traits

A11yBackend

The bridge between the ECS world and the platform accessibility API.

Bindable

Declares that a Component participates in the entity-property bus exposed by crate::property_store::PropertyStore.

LayoutEngine

A layout engine: what turns the styled tree into absolute boxes.

RenderTarget

A live OS window a Renderer presents into.

Renderer

A render backend’s renderer: everything between the retained scene and the pixels.

WindowBackend

A window backend: the OS window, the event loop, and the translation of platform events into the app’s messages.