Struct LayoutGeneration 

pub struct LayoutGeneration {
    pub width: u32,
    pub font: u32,
    pub theme: u32,
    pub zoom_permille: u32,
}

Identifies the conditions a LayoutCache was computed under.

A cache is valid only for the generation it was built at; anything that changes rendered geometry bumps a field. Critically, bumping a generation does not trigger recomputation — caches are rebuilt lazily when a row is next laid out, so a resize costs O(visible).

Fields

width: u32

Content width in pixels.

font: u32

Bumped on font change.

theme: u32

Bumped on theme change (palette resolution can alter nothing geometric, but a theme may carry a font).

zoom_permille: u32

Zoom level in per-mille, so the generation stays Eq-comparable. See docs/design.md “Layout, the height index, and scroll anchoring”.

Trait Implementations

impl Clone for LayoutGeneration

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 LayoutGeneration

impl Debug for LayoutGeneration

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

Formats the value using the given formatter.

impl Default for LayoutGeneration

fn default() -> Self

Returns the “default value” for a type.

impl Eq for LayoutGeneration

impl PartialEq for LayoutGeneration

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LayoutGeneration