pub struct EntityCommands<'a> { /* private fields */ }
Expand description

A list of commands that will be run to modify an entity.

Implementations§

source§

impl EntityCommands<'_>

source

pub fn id(&self) -> Entity

Returns the Entity id of the entity.

Example
fn my_system(mut commands: Commands) {
    let entity_id = commands.spawn_empty().id();
}
source

pub fn reborrow(&mut self) -> EntityCommands<'_>

Returns an EntityCommands with a smaller lifetime. This is useful if you have &mut EntityCommands but you need EntityCommands.

source

pub fn insert(&mut self, bundle: impl Bundle) -> &mut EntityCommands<'_>

Adds a Bundle of components to the entity.

This will overwrite any previous value(s) of the same component type.

Panics

The command will panic when applied if the associated entity does not exist.

To avoid a panic in this case, use the command Self::try_insert instead.

Example
#[derive(Component)]
struct Health(u32);
#[derive(Component)]
struct Strength(u32);
#[derive(Component)]
struct Defense(u32);

#[derive(Bundle)]
struct CombatBundle {
    health: Health,
    strength: Strength,
}

fn add_combat_stats_system(mut commands: Commands, player: Res<PlayerEntity>) {
    commands
        .entity(player.entity)
        // You can insert individual components:
        .insert(Defense(10))
        // You can also insert pre-defined bundles of components:
        .insert(CombatBundle {
            health: Health(100),
            strength: Strength(40),
        })
        // You can also insert tuples of components and bundles.
        // This is equivalent to the calls above:
        .insert((
            Defense(10),
            CombatBundle {
                health: Health(100),
                strength: Strength(40),
            },
        ));
}
source

pub fn try_insert(&mut self, bundle: impl Bundle) -> &mut EntityCommands<'_>

Tries to add a Bundle of components to the entity.

This will overwrite any previous value(s) of the same component type.

Note

Unlike Self::insert, this will not panic if the associated entity does not exist.

Example
#[derive(Component)]
struct Health(u32);
#[derive(Component)]
struct Strength(u32);
#[derive(Component)]
struct Defense(u32);

#[derive(Bundle)]
struct CombatBundle {
    health: Health,
    strength: Strength,
}

fn add_combat_stats_system(mut commands: Commands, player: Res<PlayerEntity>) {
  commands.entity(player.entity)
   // You can try_insert individual components:
    .try_insert(Defense(10))
     
   // You can also insert tuples of components:
    .try_insert(CombatBundle {
        health: Health(100),
        strength: Strength(40),
    });
    
   // Suppose this occurs in a parallel adjacent system or process
   commands.entity(player.entity)
     .despawn();

   commands.entity(player.entity)
   // This will not panic nor will it add the component
     .try_insert(Defense(5));
}
source

pub fn remove<T>(&mut self) -> &mut EntityCommands<'_>
where T: Bundle,

Removes a Bundle of components from the entity.

Example
#[derive(Component)]
struct Health(u32);
#[derive(Component)]
struct Strength(u32);
#[derive(Component)]
struct Defense(u32);

#[derive(Bundle)]
struct CombatBundle {
    health: Health,
    strength: Strength,
}

fn remove_combat_stats_system(mut commands: Commands, player: Res<PlayerEntity>) {
    commands
        .entity(player.entity)
        // You can remove individual components:
        .remove::<Defense>()
        // You can also remove pre-defined Bundles of components:
        .remove::<CombatBundle>()
        // You can also remove tuples of components and bundles.
        // This is equivalent to the calls above:
        .remove::<(Defense, CombatBundle)>();
}
source

pub fn despawn(&mut self)

Despawns the entity.

See World::despawn for more details.

Note

This won’t clean up external references to the entity (such as parent-child relationships if you’re using bevy_hierarchy), which may leave the world in an invalid state.

Panics

The command will panic when applied if the associated entity does not exist.

Example
fn remove_character_system(
    mut commands: Commands,
    character_to_remove: Res<CharacterToRemove>
)
{
    commands.entity(character_to_remove.entity).despawn();
}
source

pub fn add<M>( &mut self, command: impl EntityCommand<M> ) -> &mut EntityCommands<'_>
where M: 'static,

Pushes an EntityCommand to the queue, which will get executed for the current Entity.

Examples
commands
    .spawn_empty()
    // Closures with this signature implement `EntityCommand`.
    .add(|entity: EntityWorldMut| {
        println!("Executed an EntityCommand for {:?}", entity.id());
    });
source

pub fn retain<T>(&mut self) -> &mut EntityCommands<'_>
where T: Bundle,

Removes all components except the given Bundle from the entity.

This can also be used to remove all the components from the entity by passing it an empty Bundle.

Example
#[derive(Component)]
struct Health(u32);
#[derive(Component)]
struct Strength(u32);
#[derive(Component)]
struct Defense(u32);

#[derive(Bundle)]
struct CombatBundle {
    health: Health,
    strength: Strength,
}

fn remove_combat_stats_system(mut commands: Commands, player: Res<PlayerEntity>) {
    commands
        .entity(player.entity)
        // You can retain a pre-defined Bundle of components,
        // with this removing only the Defense component
        .retain::<CombatBundle>()
        // You can also retain only a single component
        .retain::<Health>()
        // And you can remove all the components by passing in an empty Bundle
        .retain::<()>();
}
source

pub fn log_components(&mut self)

Logs the components of the entity at the info level.

Panics

The command will panic when applied if the associated entity does not exist.

source

pub fn commands(&mut self) -> Commands<'_, '_>

Returns the underlying Commands.

Trait Implementations§

source§

impl BuildChildren for EntityCommands<'_>

source§

fn with_children( &mut self, spawn_children: impl FnOnce(&mut ChildBuilder<'_>) ) -> &mut EntityCommands<'_>

Takes a closure which builds children for this entity using ChildBuilder.
source§

fn push_children(&mut self, children: &[Entity]) -> &mut EntityCommands<'_>

Pushes children to the back of the builder’s children. For any entities that are already a child of this one, this method does nothing. Read more
source§

fn insert_children( &mut self, index: usize, children: &[Entity] ) -> &mut EntityCommands<'_>

Inserts children at the given index. Read more
source§

fn remove_children(&mut self, children: &[Entity]) -> &mut EntityCommands<'_>

Removes the given children Read more
source§

fn add_child(&mut self, child: Entity) -> &mut EntityCommands<'_>

Adds a single child. Read more
source§

fn clear_children(&mut self) -> &mut EntityCommands<'_>

Removes all children from this entity. The Children component will be removed if it exists, otherwise this does nothing.
source§

fn replace_children(&mut self, children: &[Entity]) -> &mut EntityCommands<'_>

Removes all current children from this entity, replacing them with the specified list of entities. Read more
source§

fn set_parent(&mut self, parent: Entity) -> &mut EntityCommands<'_>

Sets the parent of this entity. Read more
source§

fn remove_parent(&mut self) -> &mut EntityCommands<'_>

Removes the Parent of this entity. Read more
source§

impl BuildChildrenTransformExt for EntityCommands<'_>

source§

fn set_parent_in_place(&mut self, parent: Entity) -> &mut EntityCommands<'_>

Change this entity’s parent while preserving this entity’s GlobalTransform by updating its Transform. Read more
source§

fn remove_parent_in_place(&mut self) -> &mut EntityCommands<'_>

Make this entity parentless while preserving this entity’s GlobalTransform by updating its Transform to be equal to its current GlobalTransform. Read more
source§

impl DespawnRecursiveExt for EntityCommands<'_>

source§

fn despawn_recursive(self)

Despawns the provided entity and its children.

source§

fn despawn_descendants(&mut self) -> &mut EntityCommands<'_>

Despawns all descendants of the given entity.
source§

impl ReflectCommandExt for EntityCommands<'_>

source§

fn insert_reflect( &mut self, component: Box<dyn Reflect> ) -> &mut EntityCommands<'_>

Adds the given boxed reflect component to the entity using the reflection data in AppTypeRegistry. Read more
source§

fn insert_reflect_with_registry<T>( &mut self, component: Box<dyn Reflect> ) -> &mut EntityCommands<'_>

Same as insert_reflect, but using the T resource as type registry instead of AppTypeRegistry. Read more
source§

fn remove_reflect( &mut self, component_type_path: impl Into<Cow<'static, str>> ) -> &mut EntityCommands<'_>

Removes from the entity the component with the given type name registered in AppTypeRegistry. Read more
source§

fn remove_reflect_with_registry<T>( &mut self, component_type_name: impl Into<Cow<'static, str>> ) -> &mut EntityCommands<'_>

Same as remove_reflect, but using the T resource as type registry instead of AppTypeRegistry.

Auto Trait Implementations§

§

impl<'a> RefUnwindSafe for EntityCommands<'a>

§

impl<'a> Send for EntityCommands<'a>

§

impl<'a> Sync for EntityCommands<'a>

§

impl<'a> Unpin for EntityCommands<'a>

§

impl<'a> !UnwindSafe for EntityCommands<'a>

Blanket Implementations§

source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T, U> AsBindGroupShaderType<U> for T
where U: ShaderType, &'a T: for<'a> Into<U>,

source§

fn as_bind_group_shader_type(&self, _images: &RenderAssets<Image>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> Downcast<T> for T

source§

fn downcast(&self) -> &T

source§

impl<T> Downcast for T
where T: Any,

source§

fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
source§

fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
source§

fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
source§

fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
source§

impl<T> DowncastSync for T
where T: Any + Send + Sync,

source§

fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<S> FromSample<S> for S

source§

fn from_sample_(s: S) -> S

source§

impl<T> Instrument for T

source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T, U> ToSample<U> for T
where U: FromSample<T>,

source§

fn to_sample_(self) -> U

source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
source§

impl<T> Upcast<T> for T

source§

fn upcast(&self) -> Option<&T>

source§

impl<T> WithSubscriber for T

source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

impl<S, T> Duplex<S> for T
where T: FromSample<S> + ToSample<S>,

source§

impl<T> Settings for T
where T: 'static + Send + Sync,

source§

impl<T> WasmNotSend for T
where T: Send,

source§

impl<T> WasmNotSendSync for T

source§

impl<T> WasmNotSync for T
where T: Sync,