Struct Follow 

pub struct Follow;

Something following a stream of samples it does not control (a peer’s pointer, heard about thirty times a second): between two samples it glides over the gap so it arrives as the next is due (Self::glide), and when the stream goes quiet it fades over the caller’s retirement window. It has no token: the pace is the data’s own.

Implementations

impl Follow

pub const APPROACH: MotionSpec

An agent’s pointer travelling to the control it is about to act on, so the person sees where it acts: slow, longer across the screen. Reduced motion: it is there at once.

pub const GLIDE_MAX: Duration

The longest a glide between two samples takes, so a pointer that sat still goes where it was just put without drifting lazily there; a stream heard thirty times a second glides about 33 ms.

pub const FADE: Duration

How long something whose stream went quiet takes to fade out, at the end of its owner’s retirement window.

pub fn glide(since: Instant, span: Duration, now: Instant) -> f32

How far a glide that started at since and spans span has come at now, eased, 0..=1.

pub fn fading(left: Duration, fade: Duration) -> f32

The opacity of something that goes left from now, fading over the last fade of it; whole while fade is zero (reduced motion).