Struct Gesture 

pub struct Gesture {
    pub overscroll_reach_frac: f32,
    pub detent_magnet_frac: f32,
    pub fling_projection_ms: u32,
}

Tuning for direct-manipulation gestures — the numbers that decide how a dragged surface resists, catches and coasts. Shared for the same reason the springs are: two controls that resist differently read as two unrelated machines.

Each value is a fraction of the surface’s own reference extent rather than an absolute distance, so one number covers a scroll viewport and a detented wheel alike. The caller supplies the extent.

Fields

overscroll_reach_frac: f32

Ceiling on overscroll past an end, as a multiple of the surface’s reference extent — the pull approaches this and never reaches it.

Big enough that first contact reads as give rather than a stop, small enough the surface never leaves its region: slightly over one extent means you can pull an end clear of where it rests, see nothing beyond it, and be unable to pull further.

detent_magnet_frac: f32

Peak strength of the corrective pull toward the nearest detent while dragging, as a fraction of one detent.

What makes notches felt rather than merely landed on: crossing between two is a small acceleration then resistance. Zero would be a smooth slide; too large and the surface fights the hand and can’t be held between notches.

fling_projection_ms: u32

How long a release’s residual velocity is projected forward when choosing where a flick lands — the coast time the projection assumes; the settle spring supplies the actual deceleration. A flick should carry: distance travelled after release is what separates throwing something from pushing it.

Trait Implementations

impl Clone for Gesture

fn clone(&self) -> Gesture

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Gesture

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

Formats the value using the given formatter.

impl Default for Gesture

fn default() -> Gesture

Returns the “default value” for a type.

impl PartialEq for Gesture

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

impl StructuralPartialEq for Gesture