Struct SmoothScroll 

pub struct SmoothScroll {
    pub offset: f32,
    pub target: f32,
    pub velocity: f32,
    pub max: f32,
    pub stiffness: f32,
    pub friction: f32,
    pub smooth: bool,
}

A 1-D smooth scroll axis. offset is the current (fractional) pixel offset; target is where we’re easing toward; velocity carries momentum after a flick. Advance with advance (injected dt) — never reads wall-clock time.

Fields

offset: f32

Current sub-pixel offset (what the renderer draws at).

target: f32

Target offset we ease toward.

velocity: f32

Current momentum (px/s).

max: f32

Scrollable extent [0, max].

stiffness: f32

Easing stiffness (higher = snappier). 1/seconds.

friction: f32

Momentum friction per second (0..1 retained per second-ish).

smooth: bool

If false, jumps instantly to target (smooth-vs-instant toggle, SCRL-1).

Implementations

impl SmoothScroll

pub fn with_max(self, max: f32) -> Self

pub fn set_max(&mut self, max: f32)

Set the scrollable extent (e.g. total content height − viewport height), re-clamping the target.

pub fn scroll_to(&mut self, target: f32)

Request a scroll to an absolute offset (e.g. a scrollbar drag / key).

pub fn scroll_by(&mut self, delta: f32)

Scroll by a delta (wheel/keys). Adds momentum proportional to the delta so repeated flicks accelerate (SCRL-1).

pub fn flick(&mut self, velocity: f32)

Apply a momentum flick (px/s), e.g. from a fast drag release.

pub fn advance(&mut self, dt: f32)

Advance the animation by dt seconds (the injected clock). Integrates momentum + eases the offset toward the target with a critically-ish damped spring. Deterministic: same state + dt → same result.

pub fn animating(&self) -> bool

Whether the animation is still moving (caller requests a repaint while so).

pub fn first_row_and_frac(&self, row_h: f32) -> (usize, f32)

The integer row index at the current offset given a uniform row height, and the fractional pixel remainder the renderer draws at (SCRL-2: render at a fractional offset + clip).

Trait Implementations

impl Clone for SmoothScroll

fn clone(&self) -> SmoothScroll

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SmoothScroll

impl Debug for SmoothScroll

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

Formats the value using the given formatter.

impl Default for SmoothScroll

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SmoothScroll

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for SmoothScroll

fn eq(&self, other: &SmoothScroll) -> 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 Serialize for SmoothScroll

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for SmoothScroll