Module bevy::ecs::prelude

Most commonly used re-exported types.

Structs

• Added
  A filter on a component that only retains results added after the system last ran.
• AnyOf
  The AnyOf query parameter fetches entities with any of the component types included in T.
• AppTypeRegistry
  A Resource storing TypeRegistry for type registrations relevant to a whole app.
• Changed
  A filter on a component that only retains results added or mutably dereferenced after the system last ran.
• Commands
  A Command queue to perform structural changes to the World.
• Deferred
  A SystemParam that stores a buffer which gets applied to the World during apply_deferred. This is used internally by Commands to defer World mutations.
• Entity
  Lightweight identifier of an entity.
• EntityMut
  Provides mutable access to a single entity and all of its components.
• EntityRef
  A read-only reference to a particular Entity and all of its components.
• EntityWorldMut
  A mutable reference to a particular Entity, and the entire world. This is essentially a performance-optimized (Entity, &mut World) tuple, which caches the EntityLocation to reduce duplicate lookups.
• EventReader
  Reads events of type T in order and tracks which events have already been read.
• EventWriter
  Sends events of type T.
• Events
  An event collection that represents the events that occurred within the last two Events::update calls. Events can be written to using an EventWriter and are typically cheaply read using an EventReader.
• Has
  Returns a bool that describes if an entity has the component T.
• In
  Wrapper type to mark a SystemParam as an input.
• Local
  A system local SystemParam.
• Mut
  Unique mutable borrow of an entity’s component or of a resource.
• NextState
  The next state of State<S>.
• NonSend
  Shared borrow of a non-Send resource.
• NonSendMut
  Unique borrow of a non-Send resource.
• OnEnter
  The label of a Schedule that runs whenever State<S> enters this state.
• OnExit
  The label of a Schedule that runs whenever State<S> exits this state.
• OnTransition
  The label of a Schedule that only runs whenever State<S> exits the from state, AND enters the to state.
• Or
  A filter that tests if any of the given filters apply.
• ParallelCommands
  An alternative to Commands that can be used in parallel contexts, such as those in Query::par_iter
• ParamSet
  A collection of potentially conflicting SystemParams allowed by disjoint access.
• Query
  System parameter that provides selective access to the Component data stored in a World.
• QueryBuilder
  Builder struct to create QueryState instances at runtime.
• QueryState
  Provides scoped access to a World state according to a given QueryData and QueryFilter.
• Ref
  Shared borrow of an entity’s component with access to change detection. Similar to Mut but is immutable and so doesn’t require unique access.
• ReflectComponent
  A struct used to operate on reflected Component trait of a type.
• ReflectFromWorld
  A struct used to operate on the reflected FromWorld trait of a type.
• ReflectResource
  A struct used to operate on reflected Resource of a type.
• RemovedComponents
  A SystemParam that yields entities that had their T Component removed or have been despawned with it.
• Res
  Shared borrow of a Resource.
• ResMut
  Unique mutable borrow of a Resource.
• Schedule
  A collection of systems, and the metadata and executor needed to run them in a certain order under certain conditions.
• Schedules
  Resource that stores Schedules mapped to ScheduleLabels excluding the current running Schedule.
• State
  A finite-state machine whose transitions have associated schedules ([OnEnter(state)] and [OnExit(state)]).
• StateTransitionEvent
  Event sent when any state transition of S happens.
• With
  Filter that selects entities with a component T.
• Without
  Filter that selects entities without a component T.
• World
  Stores and exposes operations on entities, components, resources, and their associated metadata.

Traits

• Bundle
  The Bundle trait enables insertion and removal of Components from an entity.
• Component
  A data type that can be used to store data for an entity.
• Condition
  A system that determines if one or more scheduled systems should run.
• DetectChanges
  Types that can read change detection information. This change detection is controlled by DetectChangesMut types such as ResMut.
• DetectChangesMut
  Types that implement reliable change detection.
• EntityMapper
  An implementor of this trait knows how to map an Entity into another Entity.
• Event
  A type that can be stored in an Events<E> resource You can conveniently access events using the EventReader and EventWriter system parameter.
• FromWorld
  Creates an instance of the type this trait is implemented for using data from the supplied World.
• IntoSystem
  Conversion trait to turn something into a System.
• IntoSystemConfigs
  Types that can convert into a SystemConfigs.
• IntoSystemSet
  Types that can be converted into a SystemSet.
• IntoSystemSetConfigs
  Types that can convert into a SystemSetConfigs.
• ReadOnlySystem
  System types that do not modify the World when run. This is implemented for any systems whose parameters all implement ReadOnlySystemParam.
• Resource
  A type that can be inserted into a World as a singleton.
• States
  Types that can define world-wide states in a finite-state machine.
• System
  An ECS system that can be added to a Schedule
• SystemParamFunction
  A trait implemented for all functions that can be used as Systems.
• SystemSet
  Types that identify logical groups of systems.

Functions

• any_component_removed
  Generates a Condition-satisfying closure that returns true if there are any entity with a component of the given type removed.
• any_with_component
  A Condition-satisfying system that returns true if there are any entities with the given component type.
• apply_deferred
  Instructs the executor to call System::apply_deferred on the systems that have run but not applied their Deferred system parameters (like Commands) or other system buffers.
• apply_state_transition
  If a new state is queued in NextState<S>, this system:
• in_state
  Generates a Condition-satisfying closure that returns true if the state machine is currently in state.
• not
  Generates a Condition that inverses the result of passed one.
• on_event
  Generates a Condition-satisfying closure that returns true if there are any new events of the given type since it was last called.
• resource_added
  A Condition-satisfying system that returns true if the resource of the given type has been added since the condition was last checked.
• resource_changed
  A Condition-satisfying system that returns true if the resource of the given type has had its value changed since the condition was last checked.
• resource_changed_or_removed
  Generates a Condition-satisfying closure that returns true if the resource of the given type has had its value changed since the condition was last checked.
• resource_equals
  Generates a Condition-satisfying closure that returns true if the resource is equal to value.
• resource_exists
  A Condition-satisfying system that returns true if the resource exists.
• resource_exists_and_changed
  A Condition-satisfying system that returns true if the resource of the given type has had its value changed since the condition was last checked.
• resource_exists_and_equals
  Generates a Condition-satisfying closure that returns true if the resource exists and is equal to value.
• resource_removed
  Generates a Condition-satisfying closure that returns true if the resource of the given type has been removed since the condition was last checked.
• run_once
  Generates a Condition-satisfying closure that returns true if the first time the condition is run and false every time after
• state_changed
  A Condition-satisfying system that returns true if the state machine changed state.
• state_exists
  A Condition-satisfying system that returns true if the state machine exists.
• state_exists_and_equalsDeprecated
  Identical to in_state - use that instead.

Derive Macros

• Bundle
• Component
• Event
• Resource
• States
• SystemSet
  Derive macro generating an impl of the trait SystemSet.