Trait Widget 

pub trait Widget:
    Sized
    + Send
    + Sync
    + 'static {
    // Required methods
    fn name() -> &'static str;
    fn parser_tag() -> &'static str;
    fn spawn(entity: Entity, attrs: &Attributes, world: &mut World);
}

Thin surface implemented by #[derive(Widget)].

The derive emits the plugin struct + the parser-glue impl; widget authors only fill in the per-widget systems.

Required Methods

fn name() -> &'static str

Display name - defaults to the Rust type name in the derive.

fn parser_tag() -> &'static str

Markup tag handled by the widget. The derive picks this up from #[widget(tag = "...")]. <Type>::register() publishes it into the registry behind is_widget_tag_registered, which is what makes the lumenc parser accept the tag.

fn spawn(entity: Entity, attrs: &Attributes, world: &mut World)

Make entity this widget, reading its props out of attrs.

The spawner calls this for every element whose tag the widget was registered for (register_widget), once the element’s own components are in place and before its children spawn: entity is that element and attrs every attribute it was written with. The derive emits a body that parses the #[widget(prop)] fields out of attrs over the struct’s Default and inserts the component on entity. Outside markup, spawn the entity first (world.spawn_empty().id()) and hand it in.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors