Struct SizeClass 

pub struct SizeClass {
    pub width: WidthClass,
    pub height: HeightClass,
}

A window’s size class (docs/size-classes.md), reported by the backend and read by apps through day::size_class().

Per-window, not per-app: two windows of one process can sit in different classes at the same time (a narrow and a wide window side by side, iPadOS Stage Manager, Android split-screen), and an app that keyed off a single global would lay the second window out for the first one’s size.

Fields

width: WidthClass

height: HeightClass

Implementations

impl SizeClass

pub const SPLIT_MIN_WIDTH: f64 = 600.0

The Compact/Medium width boundary in dp: the narrowest window where a second pane starts to fit. Backends that hand an adaptive container its pane widths derive them from this (Android’s list + minimum-detail widths sum to it), so the platform’s measure-time decision and this table agree by construction (docs/size-classes.md).

pub fn from_size(width: f64, height: f64) -> Self

Bucket a window’s size in points. The one place the breakpoint numbers appear.

pub fn prefers_split(self) -> bool

Whether a two-pane presentation fits. The rule behind an automatic props::NavPresentation: anything wider than compact gets both panes.

Trait Implementations

impl Clone for SizeClass

fn clone(&self) -> SizeClass

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SizeClass

impl Debug for SizeClass

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

Formats the value using the given formatter.

impl Default for SizeClass

fn default() -> SizeClass

Returns the “default value” for a type.

impl Eq for SizeClass

impl PartialEq for SizeClass

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SizeClass