Struct ScrollMetrics 

pub struct ScrollMetrics {
    pub pixels: f64,
    pub min_scroll_extent: f64,
    pub max_scroll_extent: f64,
    pub viewport_dimension: f64,
    pub device_pixel_ratio: f64,
}

A read-only snapshot of a scroll surface’s extent/position, the argument every ScrollPhysics method reasons over (Flutter’s ScrollMetrics).

min_scroll_extent is carried for parity/chaining even though frust’s scroll surfaces always run it at 0.0 today — nothing in this crate produces a nonzero value yet.

Fields

pixels: f64

The current scroll position (px scrolled down/along the axis).

min_scroll_extent: f64

The minimum in-range position. Always 0.0 in this crate today.

max_scroll_extent: f64

The maximum in-range position (content − viewport, never negative).

viewport_dimension: f64

The visible extent along the scroll axis.

device_pixel_ratio: f64

The device’s logical-to-physical pixel scale, feeding Tolerance::for_device_pixel_ratio.

Implementations

impl ScrollMetrics

pub fn out_of_range(&self) -> bool

Whether pixels currently sits outside [min_scroll_extent, max_scroll_extent].

pub fn overscroll_past_leading(&self) -> f64

How far past the leading (top/start) edge pixels currently sits, 0.0 if not past it.

pub fn overscroll_past_trailing(&self) -> f64

How far past the trailing (bottom/end) edge pixels currently sits, 0.0 if not past it.

Trait Implementations

impl Clone for ScrollMetrics

fn clone(&self) -> ScrollMetrics

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ScrollMetrics

impl Debug for ScrollMetrics

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

Formats the value using the given formatter.

impl PartialEq for ScrollMetrics

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ScrollMetrics