Trait EventPattern 

pub trait EventPattern:
    Send
    + Sync
    + 'static {
    type Event: Event;
    type Components: Bundle;
}

Trait for types that can be ‘matched’ on by Observers to register additional metadata for an Event trigger. All Events are also implicitly EventPatterns, but this trait can be manually implemented.

The following are lifecycle EventPatterns that register components to watch for via their generic Bundle type parameter:

• Add
• Insert
• Discard
• Remove
• Despawn

Required Associated Types

type Event: Event

The event type being observed.

type Components: Bundle

Components to watch for this event. This is used by EntityComponentsTrigger to determine which entities to run observers for.

See EntityComponentsTrigger for more info.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl<B> EventPattern for Add<B>

where B: Bundle,

type Event = AddEvent

type Components = B

impl<B> EventPattern for Despawn<B>

where B: Bundle,

type Event = DespawnEvent

type Components = B

impl<B> EventPattern for Discard<B>

where B: Bundle,

type Event = DiscardEvent

type Components = B

impl<B> EventPattern for Insert<B>

where B: Bundle,

type Event = InsertEvent

type Components = B

impl<B> EventPattern for Remove<B>

where B: Bundle,

type Event = RemoveEvent

type Components = B

impl<E> EventPattern for E

where E: Event,

type Event = E

type Components = ()