Struct System 

pub struct System { /* private fields */ }

Authoring-time system node: stage placement, ordering, conditions, and event roles.

Implementations

impl System

pub fn new( name: impl Into<String>, stage: impl Into<String>, body: impl FnMut(&mut World, f32) + 'static, ) -> Self

Infallible body wrapper; panics and world errors must be handled inside the closure.

pub fn try_new( name: impl Into<String>, stage: impl Into<String>, body: impl FnMut(&mut World, f32) -> Result<(), String> + 'static, ) -> Self

Fallible body that can abort the stage pass with a detail string.

pub fn with_local<L: 'static>( name: impl Into<String>, stage: impl Into<String>, init: impl FnOnce(&mut SystemInitContext<'_>) -> Result<L, String> + 'static, run: impl FnMut(&mut World, f32, &mut L) -> Result<(), String> + 'static, ) -> Self

Creates a system whose persistent local state is initialized at build time.

pub fn before(self, label: impl Into<String>) -> Self

Runs before the named system within the same stage.

pub fn after(self, label: impl Into<String>) -> Self

Runs after the named system within the same stage.

pub fn before_set(self, set: &SystemSet) -> Self

Runs before every system in the set that shares this stage.

pub fn after_set(self, set: &SystemSet) -> Self

Runs after every system in the set that shares this stage.

pub fn in_set(self, set: &SystemSet) -> Self

Membership for set-level ordering edges and shared run-if gates.

pub fn run_if(self, condition: Condition) -> Self

Skips the system body when the condition evaluates false.

pub fn requires_resource<R: 'static>(self) -> Self

Build fails unless the resource is present; attaches a world lease lock.

pub fn emits<E: Clone + 'static>(self) -> Self

Declares that this system may send events of type E.

pub fn consumes<E: Clone + 'static>(self) -> Self

Declares that this system may create readers for and read events of type E.

pub fn consumes_on_add<T: 'static>(self) -> Self

Declares that this system consumes the added lifecycle channel for T.

pub fn consumes_on_remove<T: 'static>(self) -> Self

Declares that this system consumes the removed lifecycle channel for T.

pub fn flush_mode(self, mode: FlushMode) -> Self

Overrides deferred-command flush timing for this system on Update stages.

pub fn flush_after(self) -> Self

Shorthand for FlushMode::AfterSystem on Update stages.

pub fn disabled(self) -> Self

Registers the system but leaves it disabled until toggled at runtime.

pub fn name(&self) -> &str

Authoring label and runtime diagnostic name.