Struct ScrollbarState 

pub struct ScrollbarState {
    pub alpha: f32,
    pub idle_secs: f32,
    pub last_offset: Vec2,
}

Overlay-scrollbar paint + fade state, auto-attached to every Scroll entity by lumen_primitives::scrollbar::update_scrollbars (spec section 16.2 / section 16.6). The interaction FSM (hover / drag) is global per-pointer and lives in ScrollbarInteraction; this component only carries the per-container fade clock the extract pass reads.

Fields

alpha: f32

Current fade alpha in [0, 1]; multiplied into the bar colors at extract time. 0 = fully faded out (bars skip paint AND hit).

idle_secs: f32

Ticks-of-inactivity accumulator in seconds. Reset to zero on any activity (offset change, bar hover, drag); once it exceeds the fade delay the alpha ramps down.

last_offset: Vec2

ScrollOffset observed last tick - used to detect scroll activity from any source (wheel, keyboard, inertia, script).

Trait Implementations

impl Clone for ScrollbarState

fn clone(&self) -> ScrollbarState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Component for ScrollbarState

where Self: Send + Sync + 'static,

const STORAGE_TYPE: StorageType = bevy_ecs::component::StorageType::Table

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 ScrollbarState

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

Formats the value using the given formatter.

impl Default for ScrollbarState

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for ScrollbarState

fn eq(&self, other: &ScrollbarState) -> 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 ScrollbarState

impl StructuralPartialEq for ScrollbarState