45 lines
1.3 KiB
Rust
45 lines
1.3 KiB
Rust
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//! Shared helpers for fitting text into width-constrained widgets.
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//!
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//! iced has no built-in ellipsis, so long user content (file names, layer
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//! names, paths, property values) would otherwise wrap and break row
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//! heights or spill past fixed-width panels. `elide` trims to a character
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//! budget and marks the cut with a single ellipsis.
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/// Truncate `s` to at most `max` characters, replacing the overflow with a
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/// trailing ellipsis. `max` includes the ellipsis character; `max == 0`
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/// yields an empty string. Counts by `char` so multi-byte text is safe.
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pub fn elide(s: &str, max: usize) -> String {
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if s.chars().count() <= max {
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return s.to_string();
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}
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if max == 0 {
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return String::new();
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}
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let mut out: String = s.chars().take(max - 1).collect();
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out.push('…');
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out
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}
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#[cfg(test)]
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mod tests {
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use super::elide;
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#[test]
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fn short_unchanged() {
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assert_eq!(elide("abc", 8), "abc");
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assert_eq!(elide("abc", 3), "abc");
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}
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#[test]
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fn long_truncated() {
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assert_eq!(elide("abcdef", 4), "abc…");
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assert_eq!(elide("abcdef", 1), "…");
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assert_eq!(elide("abcdef", 0), "");
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}
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#[test]
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fn multibyte_safe() {
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// No panic on a char boundary and the budget counts chars.
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assert_eq!(elide("çağrışım", 4), "çağ…");
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}
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}
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