Struct FontMetrics

pub struct FontMetrics { /* private fields */ }

TextMeasure implementation backed by fontdue (UI + bundled mono).

Construction probes a small list of common Linux sans-serif paths. The monospace slot first uses the bundled font. If a requested face is absent, measurement falls back to ApproxTextMeasure, so construction and measurement are infallible and portable.

Examples

use ailloli_ui_core::FontId;
use ailloli_ui_text::{FontMetrics, TextMeasure};
let metrics = FontMetrics::new();
assert_eq!(metrics.measure("", FontId::Ui, 16), 0.0);

Implementations

impl FontMetrics

pub fn new() -> Self

Loads the bundled monospace face and probes common Linux UI-font paths.

Missing or invalid system files are silently skipped. This function does filesystem I/O but never returns an error; unavailable faces use the approximate fallback during measurement.

Examples

use ailloli_ui_core::FontId;
use ailloli_ui_text::{FontMetrics, TextMeasure};
let metrics = FontMetrics::new();
assert!(metrics.advance('x', FontId::Mono, 14) >= 0.0);

Trait Implementations

impl Default for FontMetrics

fn default() -> Self

Returns the “default value” for a type.

impl TextMeasure for FontMetrics

fn measure(&self, text: &str, font: FontId, px_size: u16) -> f32

Returns the estimated logical-pixel advance of text at px_size.

fn advance(&self, ch: char, font: FontId, px_size: u16) -> f32

Returns the logical-pixel advance of one Unicode scalar.