Struct ExponentialDecaySpec 

pub struct ExponentialDecaySpec { /* private fields */ }

Exponential decay animation spec matching UIScrollView’s deceleration.

initial_velocity and the values returned by get_velocity_from_nanos are in points/sec (Cranpose’s velocity-tracker convention throughout the gesture pipeline); internally the law is evaluated in points/ms, which is the unit UIScrollView.DecelerationRate and scrollViewWillEndDragging(_:withVelocity:targetContentOffset:) use.

Implementations

impl ExponentialDecaySpec

pub fn new(rate: f32) -> Self

Creates a decay spec for the given per-millisecond decay rate (e.g. IOS_DECELERATION_RATE_NORMAL).

Trait Implementations

impl Clone for ExponentialDecaySpec

fn clone(&self) -> ExponentialDecaySpec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ExponentialDecaySpec

impl Debug for ExponentialDecaySpec

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

Formats the value using the given formatter.

impl Default for ExponentialDecaySpec

fn default() -> Self

Returns the “default value” for a type.

impl FloatDecayAnimationSpec for ExponentialDecaySpec

fn abs_velocity_threshold(&self) -> f32

Velocity threshold below which animation is considered finished.

fn get_value_from_nanos( &self, play_time_nanos: i64, initial_value: f32, initial_velocity: f32, ) -> f32

Get position at a given time.

fn get_velocity_from_nanos( &self, play_time_nanos: i64, _initial_value: f32, initial_velocity: f32, ) -> f32

Get velocity at a given time.

fn get_duration_nanos(&self, _initial_value: f32, initial_velocity: f32) -> i64

Get total animation duration in nanoseconds.

fn get_target_value(&self, initial_value: f32, initial_velocity: f32) -> f32

Get the target value (final position) of the animation.