Struct ScrollAxisRange 

pub struct ScrollAxisRange {
    pub value: f32,
    pub max_value: f32,
    pub reverse: bool,
    pub content_padding_start: f32,
    pub content_padding_end: f32,
}

How far a container has scrolled along one axis and how far it can go.

This is Compose’s ScrollAxisRange (verticalScrollAxisRange, horizontalScrollAxisRange). A lazy list has no whole extent to give, so it reports the first visible item as the value and one more than that as the end while it can still scroll; a reader only needs to know whether it can page on.

content_padding_start and content_padding_end are the container’s content padding at its top and bottom (or left and right) edges, in layout pixels. Content scrolls under that padding, where a bar may cover it, so a control a reader or the keyboard moves to is brought in past it.

Fields

value: f32

The current scroll position, in layout pixels. A lazy list reports the index of its first visible item.

max_value: f32

The largest value that value reaches, in the same unit.

reverse: bool

Whether the container scrolls in reverse, so content starts at the far end. Compose’s reverseScrolling.

content_padding_start: f32

The content padding at the start edge of the container, in layout pixels.

content_padding_end: f32

The content padding at the end edge of the container, in layout pixels.

Implementations

impl ScrollAxisRange

pub fn new(value: f32, max_value: f32, reverse: bool) -> ScrollAxisRange

Creates a range for a container at scroll offset value that reaches at most max_value, with no content padding.

pub fn with_content_padding(self, start: f32, end: f32) -> ScrollAxisRange

The same range with the container’s content padding at its start and end edges, in layout pixels.

pub fn can_scroll_forward(&self) -> bool

Whether the container can scroll further in the forward direction.

pub fn can_scroll_backward(&self) -> bool

Whether the container can scroll further in the backward direction.

Trait Implementations

impl Clone for ScrollAxisRange

fn clone(&self) -> ScrollAxisRange

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ScrollAxisRange

impl Debug for ScrollAxisRange

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

Formats the value using the given formatter.

impl PartialEq for ScrollAxisRange

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ScrollAxisRange