Struct State 

pub struct State<S>(/* private fields */)
where
    S: States;

A finite-state machine whose transitions have associated schedules (OnEnter(state) and OnExit(state)).

The current state value can be accessed through this resource. To change the state, queue a transition in the NextState<S> resource, and it will be applied during the StateTransition schedule - which by default runs after PreUpdate.

You can also manually trigger the StateTransition schedule to apply the changes at an arbitrary time.

The starting state is defined via the Default implementation for S.

use bevy_state::prelude::*;
use bevy_ecs::prelude::*;
use bevy_state_macros::States;

#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, Default, States)]
enum GameState {
    #[default]
    MainMenu,
    SettingsMenu,
    InGame,
}

fn game_logic(game_state: Res<State<GameState>>) {
    match game_state.get() {
        GameState::InGame => {
            // Run game logic here...
        },
        _ => {},
    }
}

Implementations

impl<S> State<S>

where S: States,

pub fn new(state: S) -> State<S>

Creates a new state with a specific value.

To change the state use NextState<S> rather than using this to modify the State<S>.

pub fn get(&self) -> &S

Get the current state.

Examples found in repository

examples/testbed/2d.rs (line 57)

fn switch_scene(
    keyboard: Res<ButtonInput<KeyCode>>,
    scene: Res<State<Scene>>,
    mut next_scene: ResMut<NextState<Scene>>,
) {
    if keyboard.just_pressed(KeyCode::Space) {
        info!("Switching scene");
        next_scene.set(scene.get().next());
    }
}

examples/testbed/3d.rs (line 68)

fn switch_scene(
    keyboard: Res<ButtonInput<KeyCode>>,
    scene: Res<State<Scene>>,
    mut next_scene: ResMut<NextState<Scene>>,
) {
    if keyboard.just_pressed(KeyCode::Space) {
        info!("Switching scene");
        next_scene.set(scene.get().next());
    }
}

examples/testbed/ui.rs (line 75)

fn switch_scene(
    keyboard: Res<ButtonInput<KeyCode>>,
    scene: Res<State<Scene>>,
    mut next_scene: ResMut<NextState<Scene>>,
) {
    if keyboard.just_pressed(KeyCode::Space) {
        info!("Switching scene");
        next_scene.set(scene.get().next());
    }
}

examples/state/sub_states.rs (line 134)

fn toggle_pause(
    input: Res<ButtonInput<KeyCode>>,
    current_state: Res<State<IsPaused>>,
    mut next_state: ResMut<NextState<IsPaused>>,
) {
    if input.just_pressed(KeyCode::Space) {
        next_state.set(match current_state.get() {
            IsPaused::Running => IsPaused::Paused,
            IsPaused::Paused => IsPaused::Running,
        });
    }
}

examples/ecs/state_scoped.rs (line 122)

fn toggle(
    time: Res<Time>,
    mut timer: ResMut<TickTock>,
    state: Res<State<GameState>>,
    mut next_state: ResMut<NextState<GameState>>,
) {
    if !timer.0.tick(time.delta()).is_finished() {
        return;
    }
    *next_state = match state.get() {
        GameState::A => NextState::Pending(GameState::B),
        GameState::B => NextState::Pending(GameState::A),
    }
}

examples/math/render_primitives.rs (line 315)

fn update_active_cameras(
    state: Res<State<CameraActive>>,
    camera_2d: Single<(Entity, &mut Camera), With<Camera2d>>,
    camera_3d: Single<(Entity, &mut Camera), (With<Camera3d>, Without<Camera2d>)>,
    mut text: Query<&mut UiTargetCamera, With<HeaderNode>>,
) {
    let (entity_2d, mut cam_2d) = camera_2d.into_inner();
    let (entity_3d, mut cam_3d) = camera_3d.into_inner();
    let is_camera_2d_active = matches!(*state.get(), CameraActive::Dim2);

    cam_2d.is_active = is_camera_2d_active;
    cam_3d.is_active = !is_camera_2d_active;

    let active_camera = if is_camera_2d_active {
        entity_2d
    } else {
        entity_3d
    };

    text.iter_mut().for_each(|mut target_camera| {
        *target_camera = UiTargetCamera(active_camera);
    });
}

fn switch_cameras(current: Res<State<CameraActive>>, mut next: ResMut<NextState<CameraActive>>) {
    let next_state = match current.get() {
        CameraActive::Dim2 => CameraActive::Dim3,
        CameraActive::Dim3 => CameraActive::Dim2,
    };
    next.set(next_state);
}

fn setup_text(mut commands: Commands, cameras: Query<(Entity, &Camera)>) {
    let active_camera = cameras
        .iter()
        .find_map(|(entity, camera)| camera.is_active.then_some(entity))
        .expect("run condition ensures existence");
    commands.spawn((
        HeaderNode,
        Node {
            justify_self: JustifySelf::Center,
            top: px(5),
            ..Default::default()
        },
        UiTargetCamera(active_camera),
        children![(
            Text::default(),
            HeaderText,
            TextLayout::new_with_justify(Justify::Center),
            children![
                TextSpan::new("Primitive: "),
                TextSpan(format!("{text}", text = PrimitiveSelected::default())),
                TextSpan::new("\n\n"),
                TextSpan::new(
                    "Press 'C' to switch between 2D and 3D mode\n\
                    Press 'Up' or 'Down' to switch to the next/previous primitive",
                ),
                TextSpan::new("\n\n"),
                TextSpan::new("(If nothing is displayed, there's no rendering support yet)",),
            ]
        )],
    ));
}

fn update_text(
    primitive_state: Res<State<PrimitiveSelected>>,
    header: Query<Entity, With<HeaderText>>,
    mut writer: TextUiWriter,
) {
    let new_text = format!("{text}", text = primitive_state.get());
    header.iter().for_each(|header_text| {
        if let Some(mut text) = writer.get_text(header_text, 2) {
            (*text).clone_from(&new_text);
        };
    });
}

fn switch_to_next_primitive(
    current: Res<State<PrimitiveSelected>>,
    mut next: ResMut<NextState<PrimitiveSelected>>,
) {
    let next_state = current.get().next();
    next.set(next_state);
}

fn switch_to_previous_primitive(
    current: Res<State<PrimitiveSelected>>,
    mut next: ResMut<NextState<PrimitiveSelected>>,
) {
    let next_state = current.get().previous();
    next.set(next_state);
}

fn in_mode(active: CameraActive) -> impl Fn(Res<State<CameraActive>>) -> bool {
    move |state| *state.get() == active
}

fn draw_gizmos_2d(mut gizmos: Gizmos, state: Res<State<PrimitiveSelected>>, time: Res<Time>) {
    const POSITION: Vec2 = Vec2::new(-LEFT_RIGHT_OFFSET_2D, 0.0);
    let angle = time.elapsed_secs();
    let isometry = Isometry2d::new(POSITION, Rot2::radians(angle));
    let color = Color::WHITE;

    #[expect(
        clippy::match_same_arms,
        reason = "Certain primitives don't have any 2D rendering support yet."
    )]
    match state.get() {
        PrimitiveSelected::RectangleAndCuboid => {
            gizmos.primitive_2d(&RECTANGLE, isometry, color);
        }
        PrimitiveSelected::CircleAndSphere => {
            gizmos.primitive_2d(&CIRCLE, isometry, color);
        }
        PrimitiveSelected::Ellipse => drop(gizmos.primitive_2d(&ELLIPSE, isometry, color)),
        PrimitiveSelected::Triangle => gizmos.primitive_2d(&TRIANGLE_2D, isometry, color),
        PrimitiveSelected::Plane => gizmos.primitive_2d(&PLANE_2D, isometry, color),
        PrimitiveSelected::Line => drop(gizmos.primitive_2d(&LINE2D, isometry, color)),
        PrimitiveSelected::Segment => {
            drop(gizmos.primitive_2d(&SEGMENT_2D, isometry, color));
        }
        PrimitiveSelected::Polyline => gizmos.primitive_2d(
            &Polyline2d {
                vertices: vec![
                    Vec2::new(-BIG_2D, -SMALL_2D),
                    Vec2::new(-SMALL_2D, SMALL_2D),
                    Vec2::new(SMALL_2D, -SMALL_2D),
                    Vec2::new(BIG_2D, SMALL_2D),
                ],
            },
            isometry,
            color,
        ),
        PrimitiveSelected::Polygon => gizmos.primitive_2d(
            &Polygon {
                vertices: vec![
                    Vec2::new(-BIG_2D, -SMALL_2D),
                    Vec2::new(BIG_2D, -SMALL_2D),
                    Vec2::new(BIG_2D, SMALL_2D),
                    Vec2::new(0.0, 0.0),
                    Vec2::new(-BIG_2D, SMALL_2D),
                ],
            },
            isometry,
            color,
        ),
        PrimitiveSelected::RegularPolygon => {
            gizmos.primitive_2d(&REGULAR_POLYGON, isometry, color);
        }
        PrimitiveSelected::Capsule => gizmos.primitive_2d(&CAPSULE_2D, isometry, color),
        PrimitiveSelected::Cylinder => {}
        PrimitiveSelected::Cone => {}
        PrimitiveSelected::ConicalFrustum => {}
        PrimitiveSelected::Torus => drop(gizmos.primitive_2d(&ANNULUS, isometry, color)),
        PrimitiveSelected::Tetrahedron => {}
        PrimitiveSelected::Arc => gizmos.primitive_2d(&ARC, isometry, color),
        PrimitiveSelected::CircularSector => {
            gizmos.primitive_2d(&CIRCULAR_SECTOR, isometry, color);
        }
        PrimitiveSelected::CircularSegment => {
            gizmos.primitive_2d(&CIRCULAR_SEGMENT, isometry, color);
        }
    }
}

/// Marker for primitive meshes to record in which state they should be visible in
#[derive(Debug, Clone, Component, Default, Reflect)]
pub struct PrimitiveData {
    camera_mode: CameraActive,
    primitive_state: PrimitiveSelected,
}

/// Marker for meshes of 2D primitives
#[derive(Debug, Clone, Component, Default)]
pub struct MeshDim2;

/// Marker for meshes of 3D primitives
#[derive(Debug, Clone, Component, Default)]
pub struct MeshDim3;

fn spawn_primitive_2d(
    mut commands: Commands,
    mut materials: ResMut<Assets<ColorMaterial>>,
    mut meshes: ResMut<Assets<Mesh>>,
) {
    const POSITION: Vec3 = Vec3::new(LEFT_RIGHT_OFFSET_2D, 0.0, 0.0);
    let material: Handle<ColorMaterial> = materials.add(Color::WHITE);
    let camera_mode = CameraActive::Dim2;
    [
        Some(RECTANGLE.mesh().build()),
        Some(CIRCLE.mesh().build()),
        Some(ELLIPSE.mesh().build()),
        Some(TRIANGLE_2D.mesh().build()),
        None, // plane
        None, // line
        None, // segment
        None, // polyline
        None, // polygon
        Some(REGULAR_POLYGON.mesh().build()),
        Some(CAPSULE_2D.mesh().build()),
        None, // cylinder
        None, // cone
        None, // conical frustum
        Some(ANNULUS.mesh().build()),
        None, // tetrahedron
    ]
    .into_iter()
    .zip(PrimitiveSelected::ALL)
    .for_each(|(maybe_mesh, state)| {
        if let Some(mesh) = maybe_mesh {
            commands.spawn((
                MeshDim2,
                PrimitiveData {
                    camera_mode,
                    primitive_state: state,
                },
                Mesh2d(meshes.add(mesh)),
                MeshMaterial2d(material.clone()),
                Transform::from_translation(POSITION),
            ));
        }
    });
}

fn spawn_primitive_3d(
    mut commands: Commands,
    mut materials: ResMut<Assets<StandardMaterial>>,
    mut meshes: ResMut<Assets<Mesh>>,
) {
    const POSITION: Vec3 = Vec3::new(-LEFT_RIGHT_OFFSET_3D, 0.0, 0.0);
    let material: Handle<StandardMaterial> = materials.add(Color::WHITE);
    let camera_mode = CameraActive::Dim3;
    [
        Some(CUBOID.mesh().build()),
        Some(SPHERE.mesh().build()),
        None, // ellipse
        Some(TRIANGLE_3D.mesh().build()),
        Some(PLANE_3D.mesh().build()),
        None, // line
        None, // segment
        None, // polyline
        None, // polygon
        None, // regular polygon
        Some(CAPSULE_3D.mesh().build()),
        Some(CYLINDER.mesh().build()),
        None, // cone
        None, // conical frustum
        Some(TORUS.mesh().build()),
        Some(TETRAHEDRON.mesh().build()),
    ]
    .into_iter()
    .zip(PrimitiveSelected::ALL)
    .for_each(|(maybe_mesh, state)| {
        if let Some(mesh) = maybe_mesh {
            commands.spawn((
                MeshDim3,
                PrimitiveData {
                    camera_mode,
                    primitive_state: state,
                },
                Mesh3d(meshes.add(mesh)),
                MeshMaterial3d(material.clone()),
                Transform::from_translation(POSITION),
            ));
        }
    });
}

fn update_primitive_meshes(
    camera_state: Res<State<CameraActive>>,
    primitive_state: Res<State<PrimitiveSelected>>,
    mut primitives: Query<(&mut Visibility, &PrimitiveData)>,
) {
    primitives.iter_mut().for_each(|(mut vis, primitive)| {
        let visible = primitive.camera_mode == *camera_state.get()
            && primitive.primitive_state == *primitive_state.get();
        *vis = if visible {
            Visibility::Inherited
        } else {
            Visibility::Hidden
        };
    });
}

fn rotate_primitive_2d_meshes(
    mut primitives_2d: Query<
        (&mut Transform, &ViewVisibility),
        (With<PrimitiveData>, With<MeshDim2>),
    >,
    time: Res<Time>,
) {
    let rotation_2d = Quat::from_mat3(&Mat3::from_angle(time.elapsed_secs()));
    primitives_2d
        .iter_mut()
        .filter(|(_, vis)| vis.get())
        .for_each(|(mut transform, _)| {
            transform.rotation = rotation_2d;
        });
}

fn rotate_primitive_3d_meshes(
    mut primitives_3d: Query<
        (&mut Transform, &ViewVisibility),
        (With<PrimitiveData>, With<MeshDim3>),
    >,
    time: Res<Time>,
) {
    let rotation_3d = Quat::from_rotation_arc(
        Vec3::Z,
        Vec3::new(
            ops::sin(time.elapsed_secs()),
            ops::cos(time.elapsed_secs()),
            ops::sin(time.elapsed_secs()) * 0.5,
        )
        .try_normalize()
        .unwrap_or(Vec3::Z),
    );
    primitives_3d
        .iter_mut()
        .filter(|(_, vis)| vis.get())
        .for_each(|(mut transform, _)| {
            transform.rotation = rotation_3d;
        });
}

fn draw_gizmos_3d(mut gizmos: Gizmos, state: Res<State<PrimitiveSelected>>, time: Res<Time>) {
    const POSITION: Vec3 = Vec3::new(LEFT_RIGHT_OFFSET_3D, 0.0, 0.0);
    let rotation = Quat::from_rotation_arc(
        Vec3::Z,
        Vec3::new(
            ops::sin(time.elapsed_secs()),
            ops::cos(time.elapsed_secs()),
            ops::sin(time.elapsed_secs()) * 0.5,
        )
        .try_normalize()
        .unwrap_or(Vec3::Z),
    );
    let isometry = Isometry3d::new(POSITION, rotation);
    let color = Color::WHITE;
    let resolution = 10;

    #[expect(
        clippy::match_same_arms,
        reason = "Certain primitives don't have any 3D rendering support yet."
    )]
    match state.get() {
        PrimitiveSelected::RectangleAndCuboid => {
            gizmos.primitive_3d(&CUBOID, isometry, color);
        }
        PrimitiveSelected::CircleAndSphere => drop(
            gizmos
                .primitive_3d(&SPHERE, isometry, color)
                .resolution(resolution),
        ),
        PrimitiveSelected::Ellipse => {}
        PrimitiveSelected::Triangle => gizmos.primitive_3d(&TRIANGLE_3D, isometry, color),
        PrimitiveSelected::Plane => drop(gizmos.primitive_3d(&PLANE_3D, isometry, color)),
        PrimitiveSelected::Line => gizmos.primitive_3d(&LINE3D, isometry, color),
        PrimitiveSelected::Segment => gizmos.primitive_3d(&SEGMENT_3D, isometry, color),
        PrimitiveSelected::Polyline => gizmos.primitive_3d(
            &Polyline3d {
                vertices: vec![
                    Vec3::new(-BIG_3D, -SMALL_3D, -SMALL_3D),
                    Vec3::new(SMALL_3D, SMALL_3D, 0.0),
                    Vec3::new(-SMALL_3D, -SMALL_3D, 0.0),
                    Vec3::new(BIG_3D, SMALL_3D, SMALL_3D),
                ],
            },
            isometry,
            color,
        ),
        PrimitiveSelected::Polygon => {}
        PrimitiveSelected::RegularPolygon => {}
        PrimitiveSelected::Capsule => drop(
            gizmos
                .primitive_3d(&CAPSULE_3D, isometry, color)
                .resolution(resolution),
        ),
        PrimitiveSelected::Cylinder => drop(
            gizmos
                .primitive_3d(&CYLINDER, isometry, color)
                .resolution(resolution),
        ),
        PrimitiveSelected::Cone => drop(
            gizmos
                .primitive_3d(&CONE, isometry, color)
                .resolution(resolution),
        ),
        PrimitiveSelected::ConicalFrustum => {
            gizmos.primitive_3d(&CONICAL_FRUSTUM, isometry, color);
        }

        PrimitiveSelected::Torus => drop(
            gizmos
                .primitive_3d(&TORUS, isometry, color)
                .minor_resolution(resolution)
                .major_resolution(resolution),
        ),
        PrimitiveSelected::Tetrahedron => {
            gizmos.primitive_3d(&TETRAHEDRON, isometry, color);
        }

        PrimitiveSelected::Arc => {}
        PrimitiveSelected::CircularSector => {}
        PrimitiveSelected::CircularSegment => {}
    }
}

Additional examples can be found in:

• examples/testbed/helpers.rs
• examples/math/custom_primitives.rs
• examples/state/computed_states.rs

Trait Implementations

impl<S> Debug for State<S>

where S: Debug + States,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<S> Deref for State<S>

where S: States,

type Target = S

The resulting type after dereferencing.

fn deref(&self) -> &<State<S> as Deref>::Target

Dereferences the value.

impl<S> FromArg for State<S>

where S: States + TypePath + FromReflect + MaybeTyped + RegisterForReflection, State<S>: Any + Send + Sync,

type This<'from_arg> = State<S>

The type to convert into.

fn from_arg(arg: Arg<'_>) -> Result<<State<S> as FromArg>::This<'_>, ArgError>

Creates an item from an argument.

impl<S> FromReflect for State<S>

where S: States + TypePath + FromReflect + MaybeTyped + RegisterForReflection, State<S>: Any + Send + Sync,

fn from_reflect(reflect: &(dyn PartialReflect + 'static)) -> Option<State<S>>

Constructs a concrete instance of Self from a reflected value.

fn take_from_reflect( reflect: Box<dyn PartialReflect>, ) -> Result<Self, Box<dyn PartialReflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails.

impl<S> FromWorld for State<S>

where S: States + FromWorld,

fn from_world(world: &mut World) -> State<S>

Creates Self using data from the given World.

impl<S> GetOwnership for State<S>

where S: States + TypePath + FromReflect + MaybeTyped + RegisterForReflection, State<S>: Any + Send + Sync,

fn ownership() -> Ownership

Returns the ownership of Self.

impl<S> GetTypeRegistration for State<S>

where S: States + TypePath + FromReflect + MaybeTyped + RegisterForReflection, State<S>: Any + Send + Sync,

fn get_type_registration() -> TypeRegistration

Returns the default TypeRegistration for this type.

fn register_type_dependencies(registry: &mut TypeRegistry)

Registers other types needed by this type.

impl<S> IntoReturn for State<S>

where S: States + TypePath + FromReflect + MaybeTyped + RegisterForReflection, State<S>: Any + Send + Sync,

fn into_return<'into_return>(self) -> Return<'into_return>

where State<S>: 'into_return,

Converts Self into a Return value.

impl<S> PartialEq<S> for State<S>

where S: States,

fn eq(&self, other: &S) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<S> PartialReflect for State<S>

where S: States + TypePath + FromReflect + MaybeTyped + RegisterForReflection, State<S>: Any + Send + Sync,

fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value.

fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>

Tries to apply a reflected value to this value.

fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type.

fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type.

fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type.

fn reflect_owned(self: Box<State<S>>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type.

fn try_into_reflect( self: Box<State<S>>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

Attempts to cast this type to a boxed, fully-reflected value.

fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

Attempts to cast this type to a fully-reflected value.

fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>

Attempts to cast this type to a mutable, fully-reflected value.

fn into_partial_reflect(self: Box<State<S>>) -> Box<dyn PartialReflect>

Casts this type to a boxed, reflected value.

fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

Casts this type to a reflected value.

fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

Casts this type to a mutable, reflected value.

fn reflect_partial_eq( &self, value: &(dyn PartialReflect + 'static), ) -> Option<bool>

Returns a “partial equality” comparison result.

fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Debug formatter for the value.

fn reflect_clone(&self) -> Result<Box<dyn Reflect>, ReflectCloneError>

Attempts to clone Self using reflection.

fn apply(&mut self, value: &(dyn PartialReflect + 'static))

Applies a reflected value to this value.

fn to_dynamic(&self) -> Box<dyn PartialReflect>

Converts this reflected value into its dynamic representation based on its kind.

fn reflect_clone_and_take<T>(&self) -> Result<T, ReflectCloneError>

where T: 'static, Self: Sized + TypePath,

For a type implementing PartialReflect, combines reflect_clone and take in a useful fashion, automatically constructing an appropriate ReflectCloneError if the downcast fails.

fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type).

fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type.

impl<S> Reflect for State<S>

where S: States + TypePath + FromReflect + MaybeTyped + RegisterForReflection, State<S>: Any + Send + Sync,

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

Returns the value as a Box<dyn Any>.

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

Returns the value as a &dyn Any.

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

Returns the value as a &mut dyn Any.

fn into_reflect(self: Box<State<S>>) -> Box<dyn Reflect>

Casts this type to a boxed, fully-reflected value.

fn as_reflect(&self) -> &(dyn Reflect + 'static)

Casts this type to a fully-reflected value.

fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)

Casts this type to a mutable, fully-reflected value.

fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value.

impl<S> TupleStruct for State<S>

where S: States + TypePath + FromReflect + MaybeTyped + RegisterForReflection, State<S>: Any + Send + Sync,

fn field(&self, index: usize) -> Option<&(dyn PartialReflect + 'static)>

Returns a reference to the value of the field with index index as a &dyn Reflect.

fn field_mut( &mut self, index: usize, ) -> Option<&mut (dyn PartialReflect + 'static)>

Returns a mutable reference to the value of the field with index index as a &mut dyn Reflect.

fn field_len(&self) -> usize

Returns the number of fields in the tuple struct.

fn iter_fields(&self) -> TupleStructFieldIter<'_>

Returns an iterator over the values of the tuple struct’s fields.

fn to_dynamic_tuple_struct(&self) -> DynamicTupleStruct

Creates a new DynamicTupleStruct from this tuple struct.

fn get_represented_tuple_struct_info(&self) -> Option<&'static TupleStructInfo>

Will return None if TypeInfo is not available.

impl<S> TypePath for State<S>

where S: States + TypePath, State<S>: Any + Send + Sync,

fn type_path() -> &'static str

Returns the fully qualified path of the underlying type.

fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type.

fn type_ident() -> Option<&'static str>

Returns the name of the type, or None if it is anonymous.

fn crate_name() -> Option<&'static str>

Returns the name of the crate the type is in, or None if it is anonymous.

fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous.

impl<S> Typed for State<S>

where S: States + TypePath + FromReflect + MaybeTyped + RegisterForReflection, State<S>: Any + Send + Sync,

fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.

impl<S> Resource for State<S>

where S: States, State<S>: Send + Sync + 'static,