Enum TickClass 

pub enum TickClass {
    CosmeticLoop,
    Transition,
}

The class of a continuation-frame request a widget makes during paint — how urgent the next frame is, so the mobile frame gate can decide whether it may be paced (see crate::app::RenderRoot::paint and the frame gate).

A widget continues an animation by asking for another frame during paint (PaintCtx::request_frame / PaintCtx::request_frame_paced); this tag says whether that next frame is user-visible motion that must land on the very next vsync (TickClass::Transition) or a decorative loop whose cadence can be throttled without a perceptible glitch (TickClass::CosmeticLoop).

Aggregation is a max-lattice: Transition dominates CosmeticLoop. Over a whole paint pass, ANY TickClass::Transition request makes the frame unpaced (must run every vsync, today’s behavior); only when every request this frame is TickClass::CosmeticLoop may the gate pace it. No request at all leaves the frame as it is today — the class is only meaningful once a frame was actually requested (see PaintCtx::frame_class).

A CosmeticLoop request may additionally name how often it wants to be re-run (PaintCtx::request_frame_paced_at); those intervals aggregate on their own MIN-lattice, orthogonal to this max-lattice over classes (see PaintCtx::paced_interval).

The gate-side pacing behavior is implemented separately (the mobile frame gate); this type is only the vocabulary a widget uses to declare intent.

Variants

CosmeticLoop

A pacable decorative loop (e.g. a skeleton shimmer, an idle pulse) — the gate may throttle its cadence when this is the only class requested this frame. Never dominates a concurrent TickClass::Transition.

Transition

User-visible motion that must reproduce every vsync — a page transition, a fling, a caret blink, a layout animation. Today’s request_frame behavior, and the dominant class in the aggregation above.

Trait Implementations

impl Clone for TickClass

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TickClass

impl Debug for TickClass

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

Formats the value using the given formatter.

impl Eq for TickClass

impl PartialEq for TickClass

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TickClass