73 lines
2.4 KiB
Rust
73 lines
2.4 KiB
Rust
use cosmic_text::{Attrs, Buffer, FontSystem, Metrics, Shaping};
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// Test for https://github.com/pop-os/cosmic-text/issues/364
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//
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// Empty lines at the start/end of a span should use that span's line height,
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// not the buffer's default line height.
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#[test]
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fn empty_lines_use_span_metrics() {
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let mut font_system = FontSystem::new();
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let metrics = Metrics::new(32.0, 44.0);
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let mut buffer = Buffer::new(&mut font_system, metrics);
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let mut buffer = buffer.borrow_with(&mut font_system);
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let attrs = Attrs::new();
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let small_attrs = attrs.clone().metrics(Metrics::relative(8.0, 1.2));
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// The empty lines from \n\n at start and end should use 8.0 * 1.2 = 9.6 line height.
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// All newlines are inside the small_attrs span so the empty lines are clearly within it.
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buffer.set_rich_text(
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[
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("Before", attrs.clone()),
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("\n\n\nSmall\n\n", small_attrs),
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("After", attrs.clone()),
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],
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&attrs,
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Shaping::Advanced,
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None,
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);
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buffer.set_size(Some(500.0), Some(500.0));
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buffer.shape_until_scroll(false);
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let line_heights: Vec<f32> = buffer.layout_runs().map(|run| run.line_height).collect();
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// line_heights should be:
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// [0] "Before" -> 44.0 (buffer default)
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// [1] "" (empty) -> 9.6 (small span metrics: 8.0 * 1.2)
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// [2] "" (empty) -> 9.6 (small span metrics: 8.0 * 1.2)
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// [3] "Small" -> 9.6 (small span metrics from glyphs)
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// [4] "" (empty) -> 9.6 (small span metrics: 8.0 * 1.2)
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// [5] "After" -> 44.0 (buffer default)
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assert_eq!(
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line_heights.len(),
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6,
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"expected 6 layout runs, got {}",
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line_heights.len()
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);
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assert!(
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(line_heights[0] - 44.0).abs() < 0.1,
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"line 0 should use buffer default: {}",
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line_heights[0]
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);
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assert!(
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(line_heights[1] - 9.6).abs() < 0.1,
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"line 1 (empty) should use span metrics: {}",
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line_heights[1]
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);
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assert!(
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(line_heights[2] - 9.6).abs() < 0.1,
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"line 2 (empty) should use span metrics: {}",
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line_heights[2]
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);
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assert!(
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(line_heights[4] - 9.6).abs() < 0.1,
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"line 4 (empty) should use span metrics: {}",
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line_heights[4]
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);
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assert!(
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(line_heights[5] - 44.0).abs() < 0.1,
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"line 5 should use buffer default: {}",
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line_heights[5]
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);
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}
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