Module aframe::component[−][src]

Expand description

A component_struct is simply a type that implements these 2 traits:

pub trait Component: Display + std::fmt::Debug + std::any::Any
{
    fn clone(&self) -> Box<dyn Component>;
    fn eq(&self, other: &'static dyn Component) -> bool;
    fn as_map(&self) -> HashMap<Cow<'static, str>, Cow<'static, str>>;
}

pub trait ConstDefault
{
    const DEFAULT: Self;
}

As long as clone provides a valid clone, eq provides a valid equality check, and as_map provides a serialization of keys to values that Aframe can understand, and a DEFAULT value is provided that can be evaluated at compile time, a struct is a valid component.

A ComponentReg is slightly more complicated, but details on its low-level API may be added here at a later date.

Macros

complex_enum

A macro to define an enum in which each variant maps to an arbitrary number of fields which will themselves be flattened into fields of the component itself. Works similarly to the component_struct! macro.

component

A macro to instantiate a component. Mimics struct creation syntax, but allows any number of fields to be left out (in which case defaults will be used). Note that the ability to leave out fields does not extend to struct_like enum variants created in this macro. For example: component!{component::Camera} will create a camera component with all its fields set to default values, whereas component!{component::Camera, active = false} will create a camera component with all its fields set to default values except the active field.

component_def

Top-level macro to define components. Usage resembles struct creation syntax. The js! macro is available for writing inline javascript, and returns a js_sys::Function object. This macro calls into on expressions passed into the fields expecting function, allowing the js! macro to be used as a catch-all. Takes the optional fields described in the table below.

component_struct

While component_def! creates a component that Aframe can access from its own runtime, the component_struct! macro creates a Rust struct that mimics the internal details of that Aframe component. Component structs are already provided for Aframe’s built-in components (WIP: not all components are defined yet. Once all aframe components are defined, calling component_struct! should only be necessary for locally-defined components. Once all components from Aframe have been defined, component_def! and component_struct! may be merged into a single macro to do the heavy-lifting of both at once). The component must be already registered in aframe before this struct may be used (although constructing it before that is safe). There are 2 variation of syntax provided, depending on the desired resulting Display implementation.

simple_enum

Defines an enum in which each variant maps to a single string (via a Display implementation). This can be combined with component_def! to crate fields with a limited number of possiblities.