Struct MotionScheme 

pub struct MotionScheme {
    pub fast_spatial: MotionSpring,
    pub fast_effects: MotionSpring,
    pub default_spatial: MotionSpring,
    pub default_effects: MotionSpring,
    pub slow_spatial: MotionSpring,
    pub slow_effects: MotionSpring,
    pub durations: MotionDurations,
    pub easing: EasingSet,
    pub reduce_motion: bool,
    pub cosmetic_loop_rate: CosmeticLoopRate,
}

The design-token vocabulary: the Theme bundle plus its component token tables, flat-re-exported from frust-theme so app code never names that crate directly. A root component reads the active theme via use_context::<Theme>(); a widget reads it during paint/layout via PaintCtx::theme_as/LayoutCtx::theme_as (or Theme::from_paint_ctx).

Includes the glass material tokens — this crate ships the opaque recipe, and a design system authors its own translucent one over the same types:

use frust::GlassScale;

let glass = GlassScale::opaque_material();
assert_eq!(glass.chrome.blur_radius_intent, 0.0);
assert!(glass.control.is_opaque());

Also the composable-theming surface: ThemeBuilder (defineTheme/copyWith analog), the no-lock-in typed extension slot (ThemeExtensions) plus its first consumer StatusPalette/StatusColors (success/warning/info), and the motion vocabulary (MotionDurations/EasingSet) — all flat-re-exported so an app (or a design-system plugin) authors a theme against frust::* alone. Six motion spring presets, plus the Glyph duration/easing token vocabulary mapped onto each baseline.

Fields

fast_spatial: MotionSpring

fast_effects: MotionSpring

default_spatial: MotionSpring

default_effects: MotionSpring

slow_spatial: MotionSpring

slow_effects: MotionSpring

durations: MotionDurations

Named duration tokens (Glyph vocabulary; see MotionDurations).

easing: EasingSet

The three-easing vocabulary (Glyph vocabulary; see EasingSet).

reduce_motion: bool

Collapses patterned motion to a fast crossfade. Every baseline below defaults this to false — the correct value absent an OS signal — and a mobile shell raises it from the platform’s own reduced-motion accessibility preference:

• Android: Settings.Global.ANIMATOR_DURATION_SCALE, reduced when the scale is exactly 0 (the same signal ValueAnimator:: areAnimatorsEnabled consults). It is not a Configuration field, so onConfigurationChanged never reports it — the embedding registers a ContentObserver on that setting’s URI and re-reads it on every resume.
• iOS: UIAccessibility.isReduceMotionEnabled, observed through UIAccessibility.reduceMotionStatusDidChangeNotification. It is not a UITraitCollection trait, so traitCollectionDidChange never fires for it.
• Desktop: no source. winit 0.30 exposes no reduced-motion (or any other accessibility-preference) accessor and nothing else in the desktop path reads one, so the desktop shell leaves this at whatever the active theme authored — a deliberate, checked gap (2026-07-31), not an oversight to re-investigate.

Both mobile shells apply the OS report as a floor: the platform’s value is OR’d over the active theme’s own authored token (each shell’s effective_reduce_motion), never assigned over it. So a theme built with reduce_motion: true keeps it while the OS setting is off, and the OS setting still wins whenever it is on.

cosmetic_loop_rate: CosmeticLoopRate

The CosmeticLoop tick-rate cap — see CosmeticLoopRate. Every baseline below defaults this to 30Hz; override via crate::builder::ThemeBuilder::map_motion. reduce_motion interplay: a widget that honors reduce_motion collapses its loop entirely (this cap never applies then) — this token only paces the loops that still run when reduce_motion is off/unhonored by that widget.

Implementations

impl MotionScheme

pub const fn neutral() -> MotionScheme

The neutral, design-language-free motion scheme.

Every spring is critically damped (damping_ratio: 1.0, no overshoot) — unlike frust-material’s under-damped 0.9 spatial springs (a deliberate M3 Expressive personality trait) or frust-cupertino’s community-documented ζ≈0.5753 iOS spring, both of which bounce by design (see each plugin’s own tokens module). A neutral-themed transition settles without overshoot — a deliberately unbranded feel, not a missing feature. Stiffness still varies by speed tier (fast > default > slow), the same three-tier shape every design system’s own baseline uses.

Duration/easing tokens are a plain, Frust-authored round-number scale — not sourced from any published design system’s table, unlike the M3/Cupertino baselines each plugin crate carries — using only the generic CSS-keyword Curve variants (EaseOut/EaseInOut/EaseIn), never a design-language-specific bezier.

Trait Implementations

impl Clone for MotionScheme

fn clone(&self) -> MotionScheme

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MotionScheme

impl Debug for MotionScheme

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

Formats the value using the given formatter.

impl PartialEq for MotionScheme

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MotionScheme