⎇ a74aeab0db69345646e44e759d70a8bd0b526578
src/compute/grid/explicit_grid.rs
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Fix CSS Grid "auto track" / placement bugs (#481)
1//! Helper functions for intialising GridTrack's from styles
2//! This mainly consists of evaluating GridAutoTracks
3use super::types::{GridTrack, TrackCounts};
4use crate::axis::AbsoluteAxis;
5use crate::math::MaybeMath;
6use crate::resolve::ResolveOrZero;
7use crate::style::{GridTrackRepetition, LengthPercentage, NonRepeatedTrackSizingFunction, Style, TrackSizingFunction};
8use crate::style_helpers::TaffyAuto;
9use crate::sys::{GridTrackVec, Vec};
10
11#[cfg(not(feature = "std"))]
12use num_traits::float::FloatCore;
13
14/// Compute the number of rows and columns in the explicit grid
15pub(crate) fn compute_explicit_grid_size_in_axis(style: &Style, axis: AbsoluteAxis) -> u16 {
16 // Load the grid-template-rows or grid-template-columns definition (depending on the axis)
17 let template = style.grid_template_tracks(axis);
18
19 // If template contains no tracks, then there are trivially zero explcit tracks
20 if template.is_empty() {
21 return 0;
22 }
23
24 // If there are any repetitions that contains no tracks, then the whole definition should be considered invalid
25 // and we default to no explicit tracks
26 let template_has_repetitions_with_zero_tracks = template.iter().any(|track_def| match track_def {
27 TrackSizingFunction::Single(_) => false,
28 TrackSizingFunction::Repeat(_, tracks) => tracks.is_empty(),
29 });
30 if template_has_repetitions_with_zero_tracks {
31 return 0;
32 }
33
34 // Compute that number of track generated by single track definition and repetitions with a fixed repetition count
35 let non_auto_repeating_track_count = template
36 .iter()
37 .map(|track_def| {
38 use GridTrackRepetition::{AutoFill, AutoFit, Count};
39 match track_def {
40 TrackSizingFunction::Single(_) => 1,
41 TrackSizingFunction::Repeat(Count(count), tracks) => count * tracks.len() as u16,
42 TrackSizingFunction::Repeat(AutoFit | AutoFill, _) => 0,
43 }
44 })
45 .sum::<u16>();
46
47 let auto_repetition_count = template.iter().filter(|track_def| track_def.is_auto_repetition()).count() as u16;
48 let all_track_defs_have_fixed_component = template.iter().all(|track_def| match track_def {
49 TrackSizingFunction::Single(sizing_function) => sizing_function.has_fixed_component(),
50 TrackSizingFunction::Repeat(_, tracks) => {
51 tracks.iter().all(|sizing_function| sizing_function.has_fixed_component())
52 }
53 });
54
55 let template_is_valid =
56 auto_repetition_count == 0 || (auto_repetition_count == 1 && all_track_defs_have_fixed_component);
57
58 // If the template is invalid because it contains multiple auto-repetition definitions or it combines an auto-repetition
59 // definition with non-fixed-size track sizing functions, then disregard it entirely and default to zero explicit tracks
60 if !template_is_valid {
61 return 0;
62 }
63
64 // If there are no repetitions, then the number of explicit tracks is simply equal to the lengths of the track definition
65 // vector (as each item in the Vec represents one track).
66 if auto_repetition_count == 0 {
67 return non_auto_repeating_track_count;
68 }
69
70 let repetition_definition = template
71 .iter()
72 .find_map(|def| {
73 use GridTrackRepetition::{AutoFill, AutoFit, Count};
74 match def {
75 TrackSizingFunction::Single(_) => None,
76 TrackSizingFunction::Repeat(Count(_), _) => None,
77 TrackSizingFunction::Repeat(AutoFit | AutoFill, tracks) => Some(tracks),
78 }
79 })
80 .unwrap();
81 let repetition_track_count = repetition_definition.len() as u16;
82
83 // Otherwise, run logic to resolve the auto-repeated track count:
84 //
85 // If the grid container has a definite size or max size in the relevant axis:
86 // - then the number of repetitions is the largest possible positive integer that does not cause the grid to overflow the content
87 // box of its grid container.
88 // Otherwise, if the grid container has a definite min size in the relevant axis:
89 // - then the number of repetitions is the smallest possible positive integer that fulfills that minimum requirement
90 // Otherwise, the specified track list repeats only once.
91 let style_size = style.size.get_abs(axis).into_option();
92 let style_min_size = style.min_size.get_abs(axis).into_option();
93 let style_max_size = style.max_size.get_abs(axis).into_option();
94
95 let outer_container_size = style_size.maybe_min(style_max_size).or(style_max_size).or(style_min_size);
96 let inner_container_size = outer_container_size.map(|size| {
97 let padding_sum = style.padding.resolve_or_zero(outer_container_size).grid_axis_sum(axis);
98 let border_sum = style.border.resolve_or_zero(outer_container_size).grid_axis_sum(axis);
99 size - padding_sum - border_sum
100 });
101 let size_is_maximum = style_size.is_some() || style_max_size.is_some();
102
103 // Determine the number of repetitions
104 let num_repetitions: u16 = match inner_container_size {
105 None => 1,
106 Some(inner_container_size) => {
107 let parent_size = Some(inner_container_size);
108
109 /// ...treating each track as its max track sizing function if that is definite or as its minimum track sizing function
110 /// otherwise, flooring the max track sizing function by the min track sizing function if both are definite
111 fn track_definite_value(sizing_function: &NonRepeatedTrackSizingFunction, parent_size: Option<f32>) -> f32 {
112 let max_size = sizing_function.max.definite_value(parent_size);
113 let min_size = sizing_function.max.definite_value(parent_size);
114 max_size.map(|max| max.maybe_min(min_size)).or(min_size).unwrap()
115 }
116
117 let non_repeating_track_used_space: f32 = template
118 .iter()
119 .map(|track_def| {
120 use GridTrackRepetition::{AutoFill, AutoFit, Count};
121 match track_def {
122 TrackSizingFunction::Single(sizing_function) => {
123 track_definite_value(sizing_function, parent_size)
124 }
125 TrackSizingFunction::Repeat(Count(count), repeated_tracks) => {
126 let sum = repeated_tracks
127 .iter()
128 .map(|sizing_function| track_definite_value(sizing_function, parent_size))
129 .sum::<f32>();
130 sum * (*count as f32)
131 }
132 TrackSizingFunction::Repeat(AutoFit | AutoFill, _) => 0.0,
133 }
134 })
135 .sum();
136 let gap_size = style.gap.get_abs(axis).resolve_or_zero(Some(inner_container_size));
137
138 // Compute the amount of space that a single repetition of the repeated track list takes
139 let per_repetition_track_used_space: f32 = repetition_definition
140 .iter()
141 .map(|sizing_function| track_definite_value(sizing_function, parent_size))
142 .sum::<f32>();
143
144 // We special case the first repetition here because the number of gaps in the first repetition
145 // depends on the number of non-repeating tracks in the template
146 let first_repetition_and_non_repeating_tracks_used_space = non_repeating_track_used_space
147 + per_repetition_track_used_space
148 + ((non_auto_repeating_track_count + repetition_track_count).saturating_sub(1) as f32 * gap_size);
149
150 // If a single repetition already overflows the container then we return 1 as the repetition count
151 // (the number of repetitions is floored at 1)
152 if first_repetition_and_non_repeating_tracks_used_space > inner_container_size {
153 1u16
154 } else {
155 let per_repetition_gap_used_space = (repetition_definition.len() as f32) * gap_size;
156 let per_repetition_used_space = per_repetition_track_used_space + per_repetition_gap_used_space;
157 let num_repetition_that_fit = (inner_container_size
158 - first_repetition_and_non_repeating_tracks_used_space)
159 / per_repetition_used_space;
160
161 // If the container size is a preferred or maximum size:
162 // Then we return the maximum number of repetitions that fit into the container without overflowing.
163 // If the container size is a minimum size:
164 // - Then we return the minimum number of repititions required to overflow the size.
165 //
166 // In all cases we add the additional repetition that was already accounted for in the special-case computation above
167 if size_is_maximum {
168 (num_repetition_that_fit.floor() as u16) + 1
169 } else {
170 (num_repetition_that_fit.ceil() as u16) + 1
171 }
172 }
173 }
174 };
175
176 non_auto_repeating_track_count + (repetition_track_count * num_repetitions)
177}
178
179/// Resolve the track sizing functions of explicit tracks, automatically created tracks, and gutters
180/// given a set of track counts and all of the relevant styles
181pub(super) fn initialize_grid_tracks(
182 tracks: &mut Vec<GridTrack>,
183 counts: TrackCounts,
184 track_template: &GridTrackVec<TrackSizingFunction>,
185 auto_tracks: &Vec<NonRepeatedTrackSizingFunction>,
186 gap: LengthPercentage,
187 track_has_items: impl Fn(usize) -> bool,
188) {
189 // Clear vector (in case this is a re-layout), reserve space for all tracks ahead of time to reduce allocations,
190 // and push the initial gutter
191 tracks.clear();
192 tracks.reserve((counts.len() * 2) + 1);
193 tracks.push(GridTrack::gutter(gap));
194
195 // Create negative implicit tracks
196 if counts.negative_implicit > 0 {
197 if auto_tracks.is_empty() {
198 let iter = core::iter::repeat(NonRepeatedTrackSizingFunction::AUTO);
199 create_implicit_tracks(tracks, counts.negative_implicit, iter, gap)
200 } else {
201 let offset = auto_tracks.len() - (counts.negative_implicit as usize % auto_tracks.len());
202 let iter = auto_tracks.iter().copied().cycle().skip(offset);
203 create_implicit_tracks(tracks, counts.negative_implicit, iter, gap)
204 }
205 }
206
207 let mut current_track_index = (counts.negative_implicit) as usize;
208
209 // Create explicit tracks
210 // An explicit check against the count (rather than just relying on track_template being empty) is required here
211 // because a count of zero can result from the track_template being invalid, in which case it should be ignored.
212 if counts.explicit > 0 {
213 track_template.iter().for_each(|track_sizing_function| {
214 use GridTrackRepetition::{AutoFill, AutoFit, Count};
215 match track_sizing_function {
216 TrackSizingFunction::Single(sizing_function) => {
217 tracks.push(GridTrack::new(
218 sizing_function.min_sizing_function(),
219 sizing_function.max_sizing_function(),
220 ));
221 tracks.push(GridTrack::gutter(gap));
222 current_track_index += 1;
223 }
224 TrackSizingFunction::Repeat(Count(count), repeated_tracks) => {
225 let track_iter = repeated_tracks.iter().cycle().take(repeated_tracks.len() * *count as usize);
226 track_iter.for_each(|sizing_function| {
227 tracks.push(GridTrack::new(
228 sizing_function.min_sizing_function(),
229 sizing_function.max_sizing_function(),
230 ));
231 tracks.push(GridTrack::gutter(gap));
232 current_track_index += 1;
233 });
234 }
235 TrackSizingFunction::Repeat(repetition_kind @ (AutoFit | AutoFill), repeated_tracks) => {
236 let auto_repeated_track_count = (counts.explicit - (track_template.len() as u16 - 1)) as usize;
237 let iter = repeated_tracks.iter().copied().cycle();
238 for track_def in iter.take(auto_repeated_track_count) {
239 let mut track =
240 GridTrack::new(track_def.min_sizing_function(), track_def.max_sizing_function());
241 let mut gutter = GridTrack::gutter(gap);
242
243 // Auto-fit tracks that don't contain should be collapsed.
244 if *repetition_kind == AutoFit && !track_has_items(current_track_index) {
245 track.collapse();
246 gutter.collapse();
247 }
248
249 tracks.push(track);
250 tracks.push(gutter);
251
252 current_track_index += 1;
253 }
254 }
255 }
256 });
257 }
258
259 // Create positive implicit tracks
260 if auto_tracks.is_empty() {
261 let iter = core::iter::repeat(NonRepeatedTrackSizingFunction::AUTO);
262 create_implicit_tracks(tracks, counts.positive_implicit, iter, gap)
263 } else {
264 let iter = auto_tracks.iter().copied().cycle();
265 create_implicit_tracks(tracks, counts.positive_implicit, iter, gap)
266 }
267
268 // Mark first and last grid lines as collapsed
269 tracks.first_mut().unwrap().collapse();
270 tracks.last_mut().unwrap().collapse();
271}
272
273/// Utility function for repeating logic of creating implicit tracks
274fn create_implicit_tracks(
275 tracks: &mut Vec<GridTrack>,
276 count: u16,
277 mut auto_tracks_iter: impl Iterator<Item = NonRepeatedTrackSizingFunction>,
278 gap: LengthPercentage,
279) {
280 for _ in 0..count {
281 let track_def = auto_tracks_iter.next().unwrap();
282 tracks.push(GridTrack::new(track_def.min_sizing_function(), track_def.max_sizing_function()));
283 tracks.push(GridTrack::gutter(gap));
284 }
285}
286
287#[cfg(test)]
288mod test {
289 use super::compute_explicit_grid_size_in_axis;
290 use super::initialize_grid_tracks;
291 use crate::axis::AbsoluteAxis;
292 use crate::compute::grid::types::GridTrackKind;
293 use crate::compute::grid::types::TrackCounts;
294 use crate::compute::grid::util::*;
295 use crate::prelude::*;
296
297 #[test]
298 fn explicit_grid_sizing_no_repeats() {
299 let grid_style = (600.0, 600.0, 2, 4).into_grid();
300 let width = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Horizontal);
301 let height = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Vertical);
302 assert_eq!(width, 2);
303 assert_eq!(height, 4);
304 }
305
306 #[test]
307 fn explicit_grid_sizing_auto_fill_exact_fit() {
308 use GridTrackRepetition::AutoFill;
309 let grid_style = Style {
310 display: Display::Grid,
311 size: Size { width: points(120.0), height: points(80.0) },
312 grid_template_columns: vec![repeat(AutoFill, vec![points(40.0)])],
313 grid_template_rows: vec![repeat(AutoFill, vec![points(20.0)])],
314 ..Default::default()
315 };
316 let width = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Horizontal);
317 let height = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Vertical);
318 assert_eq!(width, 3);
319 assert_eq!(height, 4);
320 }
321
322 #[test]
323 fn explicit_grid_sizing_auto_fill_non_exact_fit() {
324 use GridTrackRepetition::AutoFill;
325 let grid_style = Style {
326 display: Display::Grid,
327 size: Size { width: points(140.0), height: points(90.0) },
328 grid_template_columns: vec![repeat(AutoFill, vec![points(40.0)])],
329 grid_template_rows: vec![repeat(AutoFill, vec![points(20.0)])],
330 ..Default::default()
331 };
332 let width = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Horizontal);
333 let height = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Vertical);
334 assert_eq!(width, 3);
335 assert_eq!(height, 4);
336 }
337
338 #[test]
339 fn explicit_grid_sizing_auto_fill_min_size_exact_fit() {
340 use GridTrackRepetition::AutoFill;
341 let grid_style = Style {
342 display: Display::Grid,
343 min_size: Size { width: points(120.0), height: points(80.0) },
344 grid_template_columns: vec![repeat(AutoFill, vec![points(40.0)])],
345 grid_template_rows: vec![repeat(AutoFill, vec![points(20.0)])],
346 ..Default::default()
347 };
348 let width = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Horizontal);
349 let height = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Vertical);
350 assert_eq!(width, 3);
351 assert_eq!(height, 4);
352 }
353
354 #[test]
355 fn explicit_grid_sizing_auto_fill_min_size_non_exact_fit() {
356 use GridTrackRepetition::AutoFill;
357 let grid_style = Style {
358 display: Display::Grid,
359 min_size: Size { width: points(140.0), height: points(90.0) },
360 grid_template_columns: vec![repeat(AutoFill, vec![points(40.0)])],
361 grid_template_rows: vec![repeat(AutoFill, vec![points(20.0)])],
362 ..Default::default()
363 };
364 let width = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Horizontal);
365 let height = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Vertical);
366 assert_eq!(width, 4);
367 assert_eq!(height, 5);
368 }
369
370 #[test]
371 fn explicit_grid_sizing_auto_fill_multiple_repeated_tracks() {
372 use GridTrackRepetition::AutoFill;
373 let grid_style = Style {
374 display: Display::Grid,
375 size: Size { width: points(140.0), height: points(100.0) },
376 grid_template_columns: vec![repeat(AutoFill, vec![points(40.0), points(20.0)])],
377 grid_template_rows: vec![repeat(AutoFill, vec![points(20.0), points(10.0)])],
378 ..Default::default()
379 };
380 let width = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Horizontal);
381 let height = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Vertical);
382 assert_eq!(width, 4); // 2 repetitions * 2 repeated tracks = 4 tracks in total
383 assert_eq!(height, 6); // 3 repetitions * 2 repeated tracks = 4 tracks in total
384 }
385
386 #[test]
387 fn explicit_grid_sizing_auto_fill_gap() {
388 use GridTrackRepetition::AutoFill;
389 let grid_style = Style {
390 display: Display::Grid,
391 size: Size { width: points(140.0), height: points(100.0) },
392 grid_template_columns: vec![repeat(AutoFill, vec![points(40.0)])],
393 grid_template_rows: vec![repeat(AutoFill, vec![points(20.0)])],
394 gap: points(20.0),
395 ..Default::default()
396 };
397 let width = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Horizontal);
398 let height = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Vertical);
399 assert_eq!(width, 2); // 2 tracks + 1 gap
400 assert_eq!(height, 3); // 3 tracks + 2 gaps
401 }
402
403 #[test]
404 fn explicit_grid_sizing_no_defined_size() {
405 use GridTrackRepetition::AutoFill;
406 let grid_style = Style {
407 display: Display::Grid,
408 grid_template_columns: vec![repeat(AutoFill, vec![points(40.0), percent(0.5), points(20.0)])],
409 grid_template_rows: vec![repeat(AutoFill, vec![points(20.0)])],
410 gap: points(20.0),
411 ..Default::default()
412 };
413 let width = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Horizontal);
414 let height = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Vertical);
415 assert_eq!(width, 3);
416 assert_eq!(height, 1);
417 }
418
419 #[test]
420 fn explicit_grid_sizing_mix_repeated_and_non_repeated() {
421 use GridTrackRepetition::AutoFill;
422 let grid_style = Style {
423 display: Display::Grid,
424 size: Size { width: points(140.0), height: points(100.0) },
425 grid_template_columns: vec![points(20.0), repeat(AutoFill, vec![points(40.0)])],
426 grid_template_rows: vec![points(40.0), repeat(AutoFill, vec![points(20.0)])],
427 gap: points(20.0),
428 ..Default::default()
429 };
430 let width = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Horizontal);
431 let height = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Vertical);
432 assert_eq!(width, 3); // 3 tracks + 2 gaps
433 assert_eq!(height, 2); // 2 tracks + 1 gap
434 }
435
436 #[test]
437 fn explicit_grid_sizing_mix_with_padding() {
438 use GridTrackRepetition::AutoFill;
439 let grid_style = Style {
440 display: Display::Grid,
441 size: Size { width: points(120.0), height: points(120.0) },
442 padding: Rect { left: points(10.0), right: points(10.0), top: points(20.0), bottom: points(20.0) },
443 grid_template_columns: vec![repeat(AutoFill, vec![points(20.0)])],
444 grid_template_rows: vec![repeat(AutoFill, vec![points(20.0)])],
445 ..Default::default()
446 };
447 let width = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Horizontal);
448 let height = compute_explicit_grid_size_in_axis(&grid_style, AbsoluteAxis::Vertical);
449 assert_eq!(width, 5); // 40px horizontal padding
450 assert_eq!(height, 4); // 20px vertical padding
451 }
452
453 #[test]
454 fn test_initialize_grid_tracks() {
455 let px0 = LengthPercentage::Points(0.0);
456 let px20 = LengthPercentage::Points(20.0);
457 let px100 = LengthPercentage::Points(100.0);
458
459 // Setup test
460 let track_template = vec![points(100.0), minmax(points(100.0), fr(2.0)), fr(1.0)];
461 let track_counts =
462 TrackCounts { negative_implicit: 3, explicit: track_template.len() as u16, positive_implicit: 3 };
463 let auto_tracks = vec![auto(), points(100.0)];
464 let gap = px20;
465
466 // Call function
467 let mut tracks = Vec::new();
468 initialize_grid_tracks(&mut tracks, track_counts, &track_template, &auto_tracks, gap, |_| false);
469
470 // Assertions
471 let expected = vec![
472 // Gutter
473 (GridTrackKind::Gutter, MinTrackSizingFunction::Fixed(px0), MaxTrackSizingFunction::Fixed(px0)),
474 // Negative implict tracks
475 (GridTrackKind::Track, MinTrackSizingFunction::Fixed(px100), MaxTrackSizingFunction::Fixed(px100)),
476 (GridTrackKind::Gutter, MinTrackSizingFunction::Fixed(px20), MaxTrackSizingFunction::Fixed(px20)),
477 (GridTrackKind::Track, MinTrackSizingFunction::Auto, MaxTrackSizingFunction::Auto),
478 (GridTrackKind::Gutter, MinTrackSizingFunction::Fixed(px20), MaxTrackSizingFunction::Fixed(px20)),
479 (GridTrackKind::Track, MinTrackSizingFunction::Fixed(px100), MaxTrackSizingFunction::Fixed(px100)),
480 (GridTrackKind::Gutter, MinTrackSizingFunction::Fixed(px20), MaxTrackSizingFunction::Fixed(px20)),
481 // Explicit tracks
482 (GridTrackKind::Track, MinTrackSizingFunction::Fixed(px100), MaxTrackSizingFunction::Fixed(px100)),
483 (GridTrackKind::Gutter, MinTrackSizingFunction::Fixed(px20), MaxTrackSizingFunction::Fixed(px20)),
484 (GridTrackKind::Track, MinTrackSizingFunction::Fixed(px100), MaxTrackSizingFunction::Fraction(2.0)), // Note: separate min-max functions
485 (GridTrackKind::Gutter, MinTrackSizingFunction::Fixed(px20), MaxTrackSizingFunction::Fixed(px20)),
486 (GridTrackKind::Track, MinTrackSizingFunction::Auto, MaxTrackSizingFunction::Fraction(1.0)), // Note: min sizing function of flex sizing functions is auto
487 (GridTrackKind::Gutter, MinTrackSizingFunction::Fixed(px20), MaxTrackSizingFunction::Fixed(px20)),
488 // Positive implict tracks
489 (GridTrackKind::Track, MinTrackSizingFunction::Auto, MaxTrackSizingFunction::Auto),
490 (GridTrackKind::Gutter, MinTrackSizingFunction::Fixed(px20), MaxTrackSizingFunction::Fixed(px20)),
491 (GridTrackKind::Track, MinTrackSizingFunction::Fixed(px100), MaxTrackSizingFunction::Fixed(px100)),
492 (GridTrackKind::Gutter, MinTrackSizingFunction::Fixed(px20), MaxTrackSizingFunction::Fixed(px20)),
493 (GridTrackKind::Track, MinTrackSizingFunction::Auto, MaxTrackSizingFunction::Auto),
494 (GridTrackKind::Gutter, MinTrackSizingFunction::Fixed(px0), MaxTrackSizingFunction::Fixed(px0)),
495 ];
496
497 assert_eq!(tracks.len(), expected.len(), "Number of tracks doesn't match");
498
499 for (idx, (actual, (kind, min, max))) in tracks.into_iter().zip(expected).enumerate() {
500 assert_eq!(actual.kind, kind, "Track {idx} (0-based index)");
501 assert_eq!(actual.min_track_sizing_function, min, "Track {idx} (0-based index)");
502 assert_eq!(actual.max_track_sizing_function, max, "Track {idx} (0-based index)");
503 }
504 }
505}