Struct RubberBand 

pub struct RubberBand { /* private fields */ }

The give of a scroll view past its ends, per axis: negative before the start, positive past the end, in logical pixels.

Implementations

impl RubberBand

pub const SPEC: MotionSpec

The spring back: fast; reduced motion has no give to spring from, and nothing a shortcut does stretches it.

pub fn new() -> RubberBand

pub fn pull( &mut self, excess: Vec2, viewport: Vec2, motion: EffectiveMotion, now: Instant, )

The hand asked the content excess past its ends this input (what the content could not take, per axis; zero where it took it all), in a view viewport large: the give follows through the band. A give springing back is caught where it is drawn.

pub fn take_in( &mut self, delta: Vec2, viewport: Vec2, motion: EffectiveMotion, now: Instant, ) -> Vec2

The hand moved the content by delta while it may hold a give: the part of it that goes back toward the ends takes the give in first, through the band. Returns what is left to move the content by.

pub fn release( &mut self, velocity: Vec2, viewport: Vec2, motion: EffectiveMotion, now: Instant, )

The hand let go moving the content at velocity (logical pixels per second): the give springs back to the ends, starting at the speed the band gave it there.

pub fn stop(&mut self)

No give, at once.

pub fn give(&self, now: Instant, device_scale: f64) -> Vec2

The give drawn at now, in whole device pixels of device_scale per logical pixel, so a host that copies what a scroll keeps copies it.

pub fn needs_frame(&self, now: Instant, device_scale: f64) -> bool

Whether the content wants a frame for its give: it springs back, or was last drawn with another give than it has now.

pub fn is_stretched(&self, now: Instant) -> bool

Whether the content stands past an end, held or springing back.

pub fn is_moving(&self, now: Instant) -> bool

Whether the give is springing back at now.

pub fn settles_at(&self) -> Option<Instant>

When the spring back arrives; None at rest.

Trait Implementations

impl Clone for RubberBand

fn clone(&self) -> RubberBand

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RubberBand

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

Formats the value using the given formatter.

impl Default for RubberBand

fn default() -> RubberBand

Returns the “default value” for a type.