Struct AppContextTextMeasurer 

pub struct AppContextTextMeasurer;

Measures draw-scope text against the app’s fonts.

Every call lands in [super::measure::measure_resolved_text], backed by the app context’s metrics cache — so measuring an unchanged string every frame is a hash lookup, not a shaping pass.

“Resolved” is the whole point: a DrawTextStyle states final sizes, and a scene lowers a text primitive with style.resolved_font_size() untouched, so the system font scale must not be folded in here. It is applied where an unresolved size lives instead — the Text composable’s Sp values — and that path carries the scaled style through to the renderer with it.

Implementations

impl AppContextTextMeasurer

pub fn shared() -> Rc<dyn DrawTextMeasurer>

A shared measurer to hand to DrawScopeDefault::with_text_measurer.

Trait Implementations

impl Clone for AppContextTextMeasurer

fn clone(&self) -> AppContextTextMeasurer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for AppContextTextMeasurer

impl Debug for AppContextTextMeasurer

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

Formats the value using the given formatter.

impl Default for AppContextTextMeasurer

fn default() -> AppContextTextMeasurer

Returns the “default value” for a type.

impl DrawTextMeasurer for AppContextTextMeasurer

fn measure_text(&self, text: &str, style: &DrawTextStyle) -> TextMeasurement