52 lines
1.5 KiB
Rust
52 lines
1.5 KiB
Rust
use cosmic_text::{
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Align, Attrs, AttrsList, BufferLine, Family, FontSystem, LayoutLine, LineEnding, Shaping, Wrap,
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};
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use std::collections::HashMap;
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#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
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pub struct LineNumberKey {
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pub number: usize,
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pub width: usize,
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}
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#[derive(Debug)]
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pub struct LineNumberCache {
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cache: HashMap<LineNumberKey, Vec<LayoutLine>>,
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}
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impl LineNumberCache {
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pub fn new() -> Self {
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Self {
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cache: HashMap::new(),
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}
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}
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pub fn clear(&mut self) {
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self.cache.clear();
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}
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pub fn get(&mut self, font_system: &mut FontSystem, key: LineNumberKey) -> &Vec<LayoutLine> {
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self.cache.entry(key).or_insert_with(|| {
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//TODO: do not repeat, used in App::init
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let attrs = Attrs::new().family(Family::Monospace);
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let text = format!("{:width$}", key.number, width = key.width);
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let mut buffer_line = BufferLine::new(
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text,
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LineEnding::default(),
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AttrsList::new(&attrs),
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Shaping::Advanced,
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);
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buffer_line.set_align(Some(Align::Left));
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buffer_line
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.layout(
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font_system,
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1.0, /* font size adjusted later */
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None,
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Wrap::None,
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None,
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8, /* default tab width */
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)
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.to_vec()
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})
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}
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}
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