Enum ScrollDecelerationRate 

pub enum ScrollDecelerationRate {
    Normal,
    Fast,
}

How fast a fling’s momentum is taken away — the bouncing family’s second deceleration profile.

It is chosen by what is doing the scrolling, not by how fast. A finger throws a surface and lets go of it; a trackpad or a wheel is a hand resting on a device that reports motion, and the two want different endings. So this is a property of the physics a scrollable is built with — settled once, from the platform — and not something recomputed per fling.

Variants

Normal

A finger’s. What a touch screen expects, and the default.

Fast

A trackpad’s or a wheel’s — what desktop software expects from a pointing device more precise than a fingertip.

Four things differ, not one: the fling carries a constant deceleration so that it actually stops rather than coasting to a halt at infinity, the rubber band is twice as stiff, a fling may be twice again as fast, and easing back out of an overscroll is not resisted at all — which is a behaviour rather than a number, and the one a reader notices.

Trait Implementations

impl Clone for ScrollDecelerationRate

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 ScrollDecelerationRate

impl Debug for ScrollDecelerationRate

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

Formats the value using the given formatter.

impl Default for ScrollDecelerationRate

fn default() -> Self

Returns the “default value” for a type.

impl Eq for ScrollDecelerationRate

impl Hash for ScrollDecelerationRate

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ScrollDecelerationRate

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ScrollDecelerationRate