Trait Layer 

pub trait Layer<S, E> {
    // Required method
    fn update(&mut self, _state: &mut S, _event: &E) -> Change<S, E>;

    // Provided method
    fn passive_update(&mut self, _state: &mut S, _event: &E) { ... }
}

A trait, every layer has to implement, in order to be used by the layer manager;

Required Methods

fn update(&mut self, _state: &mut S, _event: &E) -> Change<S, E>

Executed for top layer and optionally for more layers. Most useful for click events.

Provided Methods

fn passive_update(&mut self, _state: &mut S, _event: &E)

Executed for all layers from bottom to top. Most useful for rendering.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors