Enum ScrollPhase 

#[non_exhaustive]
pub enum ScrollPhase {
    Discrete,
    Began,
    Changed,
    Ended,
    Momentum,
    MomentumEnded,
    Fling,
    Cancelled,
}

Where a scroll sits in a continuous gesture.

A wheel notch is Discrete — it has no beginning and no end — which is why that is the default and why nothing changes for a mouse. A trackpad gesture and a synthesised touch pan run Began → Changed* → Ended, optionally followed by Momentum* → MomentumEnded while the content coasts.

#[non_exhaustive]: a rubber-band settle phase is anticipated.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Discrete

A self-contained scroll with no phase structure — a wheel notch. The default, and what every scroll in Teksilo was before the touch programme.

Began

The user’s fingers went down and the gesture began.

Changed

The gesture is in progress.

Ended

The user’s fingers lifted. Any momentum follows separately.

Momentum

The content is coasting after the fingers lifted.

MomentumEnded

The coast finished.

Fling

A one-shot flick with a release velocity, for backends that report a fling rather than a momentum stream.

Cancelled

The gesture was revoked before it ended.

Trait Implementations

impl Clone for ScrollPhase

fn clone(&self) -> ScrollPhase

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ScrollPhase

impl Debug for ScrollPhase

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

Formats the value using the given formatter.

impl Default for ScrollPhase

fn default() -> ScrollPhase

Returns the “default value” for a type.

impl Eq for ScrollPhase

impl Hash for ScrollPhase

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 ScrollPhase

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ScrollPhase