Struct StyleVersion 

pub struct StyleVersion(pub u64);

Monotonic counter bumped whenever a class / palette / media-feature change invalidates computed style for at least one entity. Downstream consumers (the cascade re-resolver, the Visuals recompute) observe Changed<StyleVersion> and re-walk only the entities the invalidation cache flagged.

Here rather than with the cascade because the writers and the readers are in different crates: a scripted class edit bumps it from the scene layer, and the host that owns the cascade reads it. A counter both can name has to sit under both.

Tuple Fields

0: u64

Implementations

impl StyleVersion

pub fn bump(world: &mut World)

Record that something a rule could match has changed.

Takes the world rather than the resource: the writers are exclusive systems, and an app assembled without a cascade (a browser page, where the page’s own CSS engine resolves rules) carries no counter until the first edit puts one there.

Trait Implementations

impl Clone for StyleVersion

fn clone(&self) -> StyleVersion

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Component for StyleVersion

where Self: Send + Sync + 'static,

const STORAGE_TYPE: StorageType = bevy_ecs::component::StorageType::SparseSet

A constant indicating the storage type used for this component.

type Mutability = Mutable

A marker type to assist Bevy with determining if this component is mutable, or immutable. Mutable components will have Component<Mutability = Mutable>, while immutable components will instead have Component<Mutability = Immutable>.

fn register_required_components( _requiree: ComponentId, required_components: &mut RequiredComponentsRegistrator<'_, '_>, )

Registers required components.

fn clone_behavior() -> ComponentCloneBehavior

Called when registering this component, allowing to override clone function (or disable cloning altogether) for this component.

fn relationship_accessor() -> Option<ComponentRelationshipAccessor<Self>>

Returns [ComponentRelationshipAccessor] required for working with relationships in dynamic contexts.

fn on_add() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_add [ComponentHook] for this Component if one is defined.

fn on_insert() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_insert [ComponentHook] for this Component if one is defined.

fn on_discard() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_discard [ComponentHook] for this Component if one is defined.

fn on_remove() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_remove [ComponentHook] for this Component if one is defined.

fn on_despawn() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_despawn [ComponentHook] for this Component if one is defined.

fn map_entities<E>(_this: &mut Self, _mapper: &mut E)

where E: EntityMapper,

Maps the entities on this component using the given EntityMapper. This is used to remap entities in contexts like scenes and entity cloning. When deriving Component, this is populated by annotating fields containing entities with #[entities]

impl Debug for StyleVersion

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

Formats the value using the given formatter.

impl Default for StyleVersion

fn default() -> StyleVersion

Returns the “default value” for a type.

impl PartialEq for StyleVersion

fn eq(&self, other: &StyleVersion) -> 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 Copy for StyleVersion

impl Eq for StyleVersion

impl Resource for StyleVersion

where Self: Send + Sync + 'static,

impl StructuralPartialEq for StyleVersion