Module scroll 

Structs

HorizontalScrollState

X-only state

ScrollAxisBinding

Callbacks for a single-axis (vertical or horizontal) scroll container.

ScrollBothBinding

Callbacks for a 2D (both-axis) scroll container.

ScrollPhysics

Handles velocity estimation from input deltas, frame-rate-independent exponential decay, edge snapping, and animation state tracking.

ScrollState

Inertial scroll state (single axis Y).

ScrollStateXY

2D state

ScrollbarStyle

Enums

ScrollAxis

Axis (or axes) a scroll modifier operates on.

ScrollBinding

Constants

SCROLL_DECAY_PER_60HZ

Per-60Hz-frame velocity decay at low speed. Higher stops the fling sooner.

SCROLL_FLING_ACTIVATE_VELOCITY

A gesture must exceed this speed (px/s) to leave a fling behind.

SCROLL_OVERSROLL_BAND_MAX

Rubber-band asymptote: overscroll never stretches past this many px.

SCROLL_STOP_VELOCITY

Fling is abandoned once speed falls below this (px/s).

Functions

os_scroll_axis

Fold leftover into one axis’s rubber band after the nested parent chain has declined it. Returns whatever is still unconsumed.

rubber_band

Asymptotic rubber band: never reaches max, so pulling harder always moves a little more without ever running away.

run_post_scroll

run_pre_scroll

tick_os_axis

Decay one axis’s rubber band back to rest. Returns true while it is active.