Struct ListReading 

pub struct ListReading {
    pub geometry: Option<ScrollGeometry>,
    pub scroll_y: f32,
    pub viewport: Size,
    pub pad_t: f32,
    pub pad_x: f32,
    pub overscan: usize,
}

What a variable-height list reads before it slices: the container’s last layout, where its scroll is going, the window, and the padding its rows sit inside. list takes it from the frame (Self::of); a binding builds it from the same readings its view already has (scrollGeometry, scrollOffset, the viewport), so the arithmetic after it is this module’s in every language.

Fields

geometry: Option<ScrollGeometry>

scroll_geometry of the container, None before a layout has resolved it — the first frame.

scroll_y: f32

scroll_offset(key).y: the retained offset, which is where an eased leg is going when it differs from geometry.offset.

viewport: Size

The window, logical px: what the first frame slices by.

pad_t: f32

The container’s top padding and its horizontal padding together.

pad_x: f32

overscan: usize

Rows built past each end of the window; 2 unless a view says.

Implementations

impl ListReading

pub fn of(ui: &Ui<'_>, key: Key, pad: Edges) -> Self

The reading for the container key, with pad its padding, from the frame being built.

Trait Implementations

impl Clone for ListReading

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ListReading

impl Debug for ListReading

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

Formats the value using the given formatter.

impl Default for ListReading

fn default() -> Self

Returns the “default value” for a type.