Trait EntityTrigger 

pub trait EntityTrigger:
    'static
    + Send
    + Sync {
    type Out: TriggerOut;

    // Required methods
    fn init(&mut self, world: &mut World);
    fn check(&mut self, entity: Entity, world: &World) -> Result<Self::Out>;
}

Types that implement this may be used in StateMachines to transition from one state to another. Look at an example for implementing this trait, since it can be tricky.

Required Associated Types

type Out: TriggerOut

The trigger’s output. See TriggerOut.

Required Methods

fn init(&mut self, world: &mut World)

Initializes/resets this trigger. Runs every time the state machine transitions.

fn check(&mut self, entity: Entity, world: &World) -> Result<Self::Out>

Checks whether the state machine should transition

Trait Implementations

impl<O: 'static + TriggerOut> EntityTrigger for Box<dyn EntityTrigger<Out = O>>

type Out = O

The trigger’s output. See TriggerOut.

fn init(&mut self, world: &mut World)

Initializes/resets this trigger. Runs every time the state machine transitions.

fn check(&mut self, entity: Entity, world: &World) -> Result<Self::Out>

Checks whether the state machine should transition

Implementations on Foreign Types

impl<O: 'static + TriggerOut> EntityTrigger for Box<dyn EntityTrigger<Out = O>>

type Out = O

fn init(&mut self, world: &mut World)

fn check(&mut self, entity: Entity, world: &World) -> Result<Self::Out>

Implementors

impl<T: ReadOnlySystem> EntityTrigger for SystemTrigger<T>

where T::In: TriggerIn, T::Out: TriggerOut,

type Out = <T as System>::Out

impl<T: EntityTrigger> EntityTrigger for NotTrigger<T>

type Out = Result<<<T as EntityTrigger>::Out as TriggerOut>::Err, <<T as EntityTrigger>::Out as TriggerOut>::Ok>

impl<T: EntityTrigger, U: EntityTrigger> EntityTrigger for AndTrigger<T, U>

type Out = Result<(<<T as EntityTrigger>::Out as TriggerOut>::Ok, <<U as EntityTrigger>::Out as TriggerOut>::Ok), Either<<<T as EntityTrigger>::Out as TriggerOut>::Err, <<U as EntityTrigger>::Out as TriggerOut>::Err>>

impl<T: EntityTrigger, U: EntityTrigger> EntityTrigger for IgnoreAndTrigger<T, U>

type Out = Result<<<U as EntityTrigger>::Out as TriggerOut>::Ok, Either<<<T as EntityTrigger>::Out as TriggerOut>::Err, <<U as EntityTrigger>::Out as TriggerOut>::Err>>

impl<T: EntityTrigger, U: EntityTrigger> EntityTrigger for OrTrigger<T, U>

type Out = Result<Either<<<T as EntityTrigger>::Out as TriggerOut>::Ok, <<U as EntityTrigger>::Out as TriggerOut>::Ok>, (<<T as EntityTrigger>::Out as TriggerOut>::Err, <<U as EntityTrigger>::Out as TriggerOut>::Err)>