ratex_layout/
layout_options.rs

1use ratex_font::{get_global_metrics, MathConstants};
2use ratex_types::color::Color;
3use ratex_types::math_style::MathStyle;
4
5/// Layout options passed through the layout tree.
6#[derive(Debug, Clone)]
7pub struct LayoutOptions {
8    pub style: MathStyle,
9    pub color: Color,
10    /// When set (e.g. in align/aligned), cap relation spacing to this many mu for consistency.
11    pub align_relation_spacing: Option<f64>,
12    /// When inside \\left...\\right, the stretch height for \\middle delimiters (second pass only).
13    pub leftright_delim_height: Option<f64>,
14    /// Extra horizontal kern between glyphs (em), e.g. for `\\url` / `\\href` to match browser tracking.
15    pub inter_glyph_kern_em: f64,
16}
17
18impl Default for LayoutOptions {
19    fn default() -> Self {
20        Self {
21            style: MathStyle::Display,
22            color: Color::BLACK,
23            align_relation_spacing: None,
24            leftright_delim_height: None,
25            inter_glyph_kern_em: 0.0,
26        }
27    }
28}
29
30impl LayoutOptions {
31    pub fn metrics(&self) -> &'static MathConstants {
32        get_global_metrics(self.style.size_index())
33    }
34
35    pub fn size_multiplier(&self) -> f64 {
36        self.style.size_multiplier()
37    }
38
39    pub fn with_style(&self, style: MathStyle) -> Self {
40        Self {
41            style,
42            color: self.color,
43            align_relation_spacing: self.align_relation_spacing,
44            leftright_delim_height: self.leftright_delim_height,
45            inter_glyph_kern_em: self.inter_glyph_kern_em,
46        }
47    }
48
49    pub fn with_color(&self, color: Color) -> Self {
50        Self {
51            style: self.style,
52            color,
53            align_relation_spacing: self.align_relation_spacing,
54            leftright_delim_height: self.leftright_delim_height,
55            inter_glyph_kern_em: self.inter_glyph_kern_em,
56        }
57    }
58
59    pub fn with_inter_glyph_kern(&self, em: f64) -> Self {
60        Self {
61            inter_glyph_kern_em: em,
62            ..self.clone()
63        }
64    }
65}
ratex_layout/layout_options.rs

ratex_layout/
layout_options.rs
