Struct MomentumDecay 

pub struct MomentumDecay {
    pub model: Option<MomentumDecayModel>,
    pub half_life_ms: Option<f64>,
    pub stop_speed: Option<f64>,
    pub distance: Option<f64>,
    pub duration_ms: Option<f64>,
    pub easing: Option<UnitBezier>,
    pub min_speed: Option<f64>,
    pub max_speed: Option<f64>,
    pub max_distance: Option<f64>,
}

How one part of a gesture’s momentum slows from its release speed.

Speeds and distances are in the part’s unit: logical pixels for pan, zoom levels for zoom, and degrees for bearing and pitch. A setting whose bit isn’t set takes the part’s default, which GestureMomentum lists. min_speed is finite and not negative, and every other number is finite and positive. A friction decay can serve every release, as a preset that matches a platform’s scrolling. An eased glide takes its direction from the part’s velocity, and its distance and duration from the caller’s plan.

See mln_momentum_decay in the C API reference.

Fields

model: Option<MomentumDecayModel>

half_life_ms: Option<f64>

For MomentumDecayModel::Friction, how long the speed takes to halve.

stop_speed: Option<f64>

For MomentumDecayModel::Friction, the speed at which it ends.

distance: Option<f64>

Required for MomentumDecayModel::Ease.

duration_ms: Option<f64>

Required for MomentumDecayModel::Ease.

easing: Option<UnitBezier>

For MomentumDecayModel::Ease, the share of distance covered over the share of duration_ms. Its control points are between 0 and 1, so the glide never passes its distance. Defaults to (0, 0, 0.25, 1), the curve that camera animations ease along by default. Android’s scroll fling follows (0.175, 0.5, 0.35, 1).

min_speed: Option<f64>

A slower release starts no momentum.

max_speed: Option<f64>

For MomentumDecayModel::Friction, a faster release counts as this.

max_distance: Option<f64>

The farthest the part moves. A friction release that would move farther starts slower, so it ends sooner, and a planned glide moves at most this far over its duration.

Trait Implementations

impl Clone for MomentumDecay

fn clone(&self) -> MomentumDecay

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MomentumDecay

impl Debug for MomentumDecay

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

Formats the value using the given formatter.

impl Default for MomentumDecay

fn default() -> MomentumDecay

Returns the “default value” for a type.

impl PartialEq for MomentumDecay

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MomentumDecay