use cosmic_text::{
fontdb, Align, Attrs, AttrsList, BidiParagraphs, Buffer, Family, FontSystem, LayoutLine,
Metrics, ShapeLine, Shaping, Weight, Wrap,
};
#[test]
fn stable_wrap() {
let font_size = 18.0;
let attrs = AttrsList::new(
Attrs::new()
.family(Family::Name("FiraMono"))
.weight(Weight::MEDIUM),
);
let mut font_system =
FontSystem::new_with_locale_and_db("en-US".into(), fontdb::Database::new());
let font = std::fs::read("fonts/FiraMono-Medium.ttf").unwrap();
font_system.db_mut().load_font_data(font);
let mut check_wrap = |text: &_, wrap, start_width| {
let line = ShapeLine::new(&mut font_system, text, &attrs, Shaping::Advanced);
let layout_unbounded = line.layout(font_size, start_width, wrap, Some(Align::Left), None);
let max_width = layout_unbounded.iter().map(|l| l.w).fold(0.0, f32::max);
let new_limit = f32::min(start_width, max_width);
let layout_bounded = line.layout(font_size, new_limit, wrap, Some(Align::Left), None);
let bounded_max_width = layout_bounded.iter().map(|l| l.w).fold(0.0, f32::max);
assert_eq!(
(max_width, layout_unbounded.len()),
(bounded_max_width, layout_bounded.len()),
"Wrap \"{wrap:?}\" with text: \"{text}\"",
);
for (u, b) in layout_unbounded[1..].iter().zip(layout_bounded[1..].iter()) {
assert_eq!(u.w, b.w, "Wrap {wrap:?} with text: \"{text}\"",);
}
};
let hello_sample = std::fs::read_to_string("sample/hello.txt").unwrap();
let cases = [
"(6) SomewhatBoringDisplayTransform",
"",
" ",
" ",
" ",
" ",
]
.into_iter()
.chain(BidiParagraphs::new(&hello_sample));
for text in cases {
for wrap in [Wrap::Word, Wrap::Glyph] {
for start_width in [f32::MAX, 80.0, 198.2132, 20.0, 4.0, 300.0] {
check_wrap(text, wrap, start_width);
let with_spaces = format!("{text} ");
check_wrap(&with_spaces, wrap, start_width);
let with_spaces_2 = format!("{text} ");
check_wrap(&with_spaces_2, wrap, start_width);
}
}
}
}
#[test]
fn wrap_extra_line() {
let mut font_system = FontSystem::new();
let metrics = Metrics::new(14.0, 20.0);
let mut buffer = Buffer::new(&mut font_system, metrics);
let mut buffer = buffer.borrow_with(&mut font_system);
buffer.set_wrap(Wrap::Word);
buffer.set_text("Lorem ipsum dolor sit amet, qui minim labore adipisicing\n\nweeewoooo minim sint cillum sint consectetur cupidatat.", Attrs::new().family(cosmic_text::Family::Name("Inter")), Shaping::Advanced);
buffer.set_size(50.0, 1000.0);
buffer.shape_until_scroll(false);
let empty_lines = buffer.layout_runs().filter(|x| x.line_w == 0.).count();
let overflow_lines = buffer.layout_runs().filter(|x| x.line_w > 50.).count();
assert_eq!(empty_lines, 1);
assert_eq!(overflow_lines, 4);
}
#[allow(dead_code)]
fn dbg_layout_lines(text: &str, lines: &[LayoutLine]) {
for line in lines {
let mut s = String::new();
for glyph in line.glyphs.iter() {
s.push_str(&text[glyph.start..glyph.end]);
}
println!("\"{s}\"");
}
}