1# Changelog
2
3## Unreleased
4
5### Fixed
6
7- Grid: tracks no longer grow past their growth limits when distributing free space to multiple tracks with asymmetric limits (in the "maximise tracks" step and when distributing item contributions to base sizes). Previously a track could be assigned space beyond its limit in later distribution iterations, causing `auto` tracks to overflow a definite container (#1000)
8
9- Flexbox: min/max sizes transferred through the aspect ratio now clamp the flex base size, the automatic minimum size, and the hypothetical main/cross sizes of flex items, instead of being baked into the item's used min/max sizes. This matches browser behaviour for replaced elements and items with `aspect-ratio` combined with min/max constraints in the opposite axis ([w3c/csswg-drafts#10997](https://github.com/w3c/csswg-drafts/issues/10997))
10
11- Numeric style helpers (`length`, `percent`, `fr`, `flex`) now accept `Input: Into<f64>` instead of `Input: Into<f32>`. This allows bare float literals such as `length(800.0)` to be used without triggering the `float_literal_f32_fallback` future-compatibility lint, while widening the set of accepted numeric input types (#974)
12
13## 0.12.2
14
15### Fixed
16
17- Block: return margin-collapsing outputs from vertical axis ComputeSize calls (#976)
18
19## 0.12.1
20
21This release container a couple of critical fixes for layout/caching bugs in the 0.12.0 release.
22
23### Fixed
24
25- Block: don't commit deferred in-flow layouts to the tree when only computing size (#971)
26- Block: pass through the requested `run_mode` when performing final layout on in-flow children, instead of always using `MeasureSize` (#972)
27
28## 0.12.0
29
30The MSRV for this release is 1.71.
31
32### Block: support for `align-content` (#959)
33
34Block containers now implement `align_content` along the block axis for their in-flow children.
35
36### More correct caching logic
37
38- The cache key now includes the axis, parent size, and available space, and ignores available space in an axis when a known dimension is set there. This is a performance hit (~10% in common cases, ~60% in pathalogically ones) but is necessary for correctness. It does also enable early-return optimizations (in cases where only the horizontal size is needed, which can allow that performance to be recouped in some cases (#911)
39
40### Fixed
41
42- Flexbox: fall back to safe `align-self` of `start` on absolute-position overflow (#958)
43- Block: derive definite height from `aspect-ratio` at final layout. A block container with `aspect-ratio` and an automatic height now becomes definite when its width is filled/stretched, so children's percentage heights resolve correctly and the ratio is preserved (#965)
44
45## 0.11.0
46
47The MSRV for this release is 1.71.
48
49### Implemented safe alignment keywords (#952)
50
51Taffy now implements [safe alignment](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/align-items#safe) (in addition to unsafe alignment).
52
53The alignment style types are now structs consisting of an `AlignmentKeyword` and an `AlignmentSafety` modifier. For most users this will mean changing from using enum variants like `AlignContent::Start` to associated constants like `AlignContent::START`.
54
55This change applies to the `AlignContent`, `JustifyContent`, `AlignItems`, `JustifyItems`, `AlignSelf`, and `JustifySelf` types.
56
57### Fixed
58
59- Grid: resolve item percentages against grid area rather than grid container (#960)
60
61## 0.10.1
62
63### Fixed
64
65- CSS Grid auto-repeat and minimum-size handling (#946)
66
67## 0.10.0
68
69The MSRV for this release is 1.71.
70
71### Support for `direction`
72
73The `direction` property is now supported, allowing for RTL layout of boxes in Block, Flexbox, and CSS Grid layout modes.
74
75### Support for floats
76
77The `float` and `clear` properties are now supported. Support consists of a general-purpose `FloatContext` in the `compute` module, and integration of float layout into Block layout. Block layout now also has a `BlockContext` that allows a `FloatContext` to be shared across an entire Block formatting context.
78
79Float support is feature flagged by the `float_layout` feature.
80
81### Support for parsing styles from CSS string (#929)
82
83All of Taffy's style types (except the top-level `Style` struct) now have `FromStr` implementations that parses the type from the CSS representation of that value (e.g. `30px` or `50%` for `LengthPercentage`. A future version of Taffy will likely add support for parsing `Style` from `;`-seperated CSS.
84
85CSS parsing is feature flagged by the `parse` feature.
86
87Additionally the `parse_faster` feature enables optimizations for faster parsing at the cost of pulling in proc-macro dependencies such as `syn`.
88
89### Changed
90
91- Make DetailedGridTracksInfo accessible from a public module (#899)
92- Add `TaffyTree::write_tree` method to debug print the tree into an arbitrary writer (#925)
93- The cache `set` and `set` APIs now take `&LayoutInput` rather than individual values (#933)
94
95### Fixed
96
97- Flexbox: apply gap even when there are auto margins (#938)
98
99## 0.9.3
100
101### Added
102
103- Added write_tree method to utils.
104
105## 0.9.2
106
107### Fixed
108
109- Fix wrong size propogation for absolute elements (#878)
110- Fix bounds check in CellOccupancyMatrix::last_of_type (#890)
111- Use doc_cfg instead of doc_auto_cfg (#868)
112
113### Changed
114
115- Upgraded grid dependency from 0.18 to 1.0 (#864)
116
117## 0.9.1
118
119### Fixed
120
121- Flexbox: don't apply cross-axis stretch alignment to children with auto margins (#861)
122
123## 0.9.0
124
125The MSRV for this release is 1.65.
126
127### Support for named grid lines and grid areas
128
129Taffy now supports named grid lines and areas.
130
131As these rely on arbitrary user-provided strings, Taffy's `Style` struct is now generic
132over a string-like type (via the `CheapCloneStr` trait). Additionally as the `grid` feature is optional,
133it has a `PhantomData` field of that type to make type inference work.
134
135### Changed
136
137- `PrintTree` and `RoundTree`: use `Layout` instead of `&Layout` (#849).
138- Renamed `TrackSizingFunction` to `GridTemplateComponent`
139- Renamed `NonRepeatedTrackSizingFunction` to `TrackSizingFunction`
140- The `Repeat` variant of `GridTemplateComponent` now contains a new `GridTemplateRepetition` struct, which allows
141  line names to be specifed in addition to tracks.
142- The way that grid styles are exposed in the low-level API is now a lot more generic with many associated types.
143
144### Added
145
146- `GridTemplateArea` struct and `Style::grid_template_areas` field
147- `Style::grid_template_column_names` and `Style::grid_template_row_names` fields. If non-empty, these
148  should have length of exactly one greater than the corresponding `grid_template_column`/`grid_template_rows` style.
149
150## 0.8.3
151
152### Fixed
153
154- Fix `serde` feature on 32bit targets (#845)
155
156## 0.8.2
157
158### Fixed
159
160- Fix: Calculate correct new grid size when expanding cell_occupancy_matrix in the negative direction (#843)
161
162## 0.8.1
163
164### Added
165
166- Impl `GridItemStyle` and `BlockContainerStyle` for `Style` (#832).
167
168## 0.8.0
169
170### Highlights
171
172**The big feature in this release is support for `calc()` values in the low-level API.**
173
174To use this API:
175
176- Implement the `resolve_calc_value` method when implementing the `LayoutPartialTree` trait.
177- Pass a type-erased pointer (`*const ()`) to constructors like `LengthPercentage::calc(...)`
178
179Taffy treats the pointer as an opaque value (excepting that it uses the low 3 bits as a tag) which it will
180pass to `LayoutPartialTree::resolve_calc_value` along with a percentage resolution basis when it needs to
181resolve the value.
182
183### Changed
184
185- The representation of many "size" types is now a tagged pointer than an enum. This is to enable `calc()`.
186  The effected types are `LengthPercentage`, `LengthPercentageAuto`, `Dimension`, `MinTrackSizingFunction`, and
187`MaxTrackSizingFunction` types.
188
189### Added
190
191- Special-case "compressible replaced elements" in grid sizing algorithm (#807)
192  This allows for more correct sizing of "replaced" elements such as images that are children
193  of flexbox or grid containers.
194
195### Fixed
196
197- Grid: Fix infinite loop due to float precision in grid layout maximise tracks step (#792)
198- Grid: Fix removed wrong addition, causing items to be misplaced. (#817)
199- Grid: Fix grid placement for items with fixed primary axis (#818)
200- Leaf layout: don't set available space to max-size (#819)
201
202## 0.7.7
203
204### Fixed
205
206- Add `#[inline]` annotation to some methods on `TaffyTree` (#802)
207- Add `TaffyTree::remove_children_range` method (#802)
208
209## 0.7.6
210
211### Fixed
212
213- Fix infinite loop due to float precision in grid layout maximise tracks step (#792)
214
215## 0.7.5
216
217### Fixed
218
219- Grid: only stretch auto tracks if content-alignment is stretch (#783)
220
221## 0.7.4
222
223### Fixed
224
225- Fix detailed grid info for empty grid (#782)
226
227## 0.7.3
228
229### Fixed
230
231- Make `TaffyTree::detailed_layout_info` take `&self` rather than `&mut self` (#779)
232
233## 0.7.2
234
235### Added
236
237- The ability to access computed track sizes and item positions of a CSS Grid layout (#772).
238  This information can be accessed using the `LayoutGridContainer::set_detailed_grid_info` method
239  in the low-level API or the `TaffyTree::detailed_layout_info` method in the high-level API.
240
241## 0.7.1
242
243### Fixed
244
245- Improve interaction of abspos children of block containers with margin collapsing (#760)
246
247### Added
248
249- Add `TaffyTree::unrounded_layout` getter (#765)
250
251### Removed
252
253- The `num-traits` dependency was removed (#761) (#762)
254
255## 0.7.0
256
257### Changed
258
259- BREAKING: The `cache_mut` method on the `LayoutPartialTree` trait has been replaced with a separate `CacheTree` trait. This allows
260  Taffy to be more easily used without caching or with a custom cache implementation.
261- BREAKING: the `TaffyTree::set_children` method now removes the children from their previous parent (if they have one).
262
263### Added
264
265- Helper methods to retrieve content-box sizes were added to `Layout`
266
267## 0.6.3
268
269### Fixes
270
271- Block: ignore margin collapsing when computing static position of abspos items (#747)
272
273## 0.6.2
274
275### Fixes
276
277- Fix: clamp indefinite available space by min- and max- size as appropriate (#742)
278
279## 0.6.1
280
281### Fixes
282
283- Fix calculation of `auto-fill`/`auto-fit` repetition count when container has a definite percentage size (#722)
284- Fix min-size style not affecting intrinsic sizes (#723)
285- Fix documentation of dirty and mark_dirty functions (#724)
286- Fix intrinsic size of scroll containers that have a small explicit flex-basis (#728)
287
288## 0.6.0
289
290### Highlights
291
292- The `Style` struct has been "traitified". This supports Taffy's integration in Servo and generally makes Taffy more flexible. The
293  `Style` struct still exists and implements the new traits so existing uses of Taffy will continue to work as before.
294- The `box-sizing` style is supported
295- Computed margins are output in `Layout`
296
297### Fixes
298
299- Fix `print_tree()` when rounding is disabled (#680)
300- Absolute Insets should be resolved against the container size minus border (#666)
301- Fix flooring hypothetical_main_size by computed min size (#689)
302- Fix flex line cross-size determination (#690)
303- Fix panics in the grid algorithm (#691)
304- Fix resolving flexible lengths (WPT css/flexbox-multiline-min-max test) (#692)
305- Fix wrapping when a max main size style is present (#694)
306- Fix case where Taffy allowed margins to collapse through an element when it shouldn't have (#695)
307
308### Added
309
310- Legacy text align (for laying out `<center>` and `<div align="..">`) is supported
311- Add `is_table` for block items (#701)
312- Impl `Debug` and `Clone` for `Cache` (#688)
313- Implement `Debug` and `PartialEq` for tree types (#697)
314
315## 0.5.2
316
317- Fix block stretch sizing (don't always apply stretch sizing to block containers) (#674)
318- Fix computation of intrinsic main size when it depends on a child's known cross size (#673)
319- Fix panic when GridLine 0 is specified (#671)
320- Docs: Document feature flags and scrape examples (#672)
321- Docs: Update cosmic-text example to cosmic-text 0.12 (#670)
322
323## 0.5.1
324
325- Fix: Clamp block item stretch widths by their min and max width (#664)
326- Fix: Auto margin computation in block layout (#663)
327
328## 0.5.0
329
330The changes in 0.5 are relatively small but the new measure function parameter is a breaking change so it requires a minor version bump.
331
332- Added: A `style: &Style` parameter has been added to measure functions.
333- Added: The `MaybeMath`, `MaybeResolve`, and `ResolveOrZero` traits have been made public.
334- Fix: use SizingMode::Inherent when sizing absolute children of flexbox nodes.
335
336## 0.4.4
337
338### Fixes
339
340- Content alignment (`align-content`/`justify-content`) behaviour was updated to match the latest spec (and Chrome 123+) (#635)
341- Ensure that root Flexbox nodes are floored by their padding-border (#651, #655)
342- Use grid area size not available space when applying aspect ratio to grid containers (#656)
343
344## 0.4.3
345
346### Fixes
347
348- Fix compilation error in `evenly_sized_tracks` style helper in recent versions of rustc caused by a change/regression in type
349  inference (#643). Note that 3rd-party code that call style helpers that take an `Into<f32>` parameter may still be affected by this issue,
350  but they should be able to fix on their side by clarifying the type passed in
351
352## 0.4.2
353
354- Fixed: single-line flex-container should clamp the line's cross-size (#638)
355- Reduced binary footprint of Taffy from around 300kb to around 150kb (#636)
356
357## 0.4.1
358
359- Fixed: CSS Grid track sizing not respecting growth limits in some circumstances (#624)
360
361## 0.4.0
362
363### Highlights
364
365- Support for CSS Block layout (`display: block`)
366- Support for the `overflow` property (+ `scrollbar_width` for `overflow: scroll`)
367- Improved measure function API
368- Completely refactored low-level API
369- Simplified module hierarchy (+ most types/functions are now exported from the crate root)
370- Expanded set of examples which better document integration with other layout systems (e.g. text layout)
371- Computed values for `padding` and `border` are now output into the `Layout` struct
372
373### Block layout
374
375Support for [CSS Block layout](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flow_Layout/Block_and_Inline_Layout_in_Normal_Flow#elements_participating_in_a_block_formatting_context) has been added. This can be used via the new `Display::Block` variant of the `Display` enum. Note that  full flow layout: inline, inline-block and float layout have *not* been implemented. The use case supported is block container nodes which contain block-level children.
376
377### Overflow property
378
379Support has been added for a new `overflow` style property with `Visible`, `Clip`, `Hidden`, and `Scroll` values (`Auto` is not currently implemented). Additionally a `scrollbar_width` property has been added to control the size of scrollbars for nodes with `Overflow::Scroll` set.
380
381- Overflow is settable indpendently in each axis.
382- `Visible` and `Clip` will produce layouts equivalent to the Taffy 0.3. `Clip` will affect the new `content_size` output by restricting it to the available space.
383- `Hidden` and `Scroll` affect layout by changing the automatic minimum size of Flexbox and Grid children
384- `Scroll` additionally reserves `scrollbar_width` pixels for a scrollbar in the opposite axis to which scrolling is enabled. `Scroll` with `scrollbar_width` set to zero is equivalent to `Hidden`.
385
386### Measure function changes
387
388The "measure function" API for integrating Taffy with other measurement systems (such as text layout) has been changed to be more flexible
389and to interact better with borrow checking (you can now borrow external data in your measure function!).
390
391- There are no longer per-node measure functions.
392- There is now a single "global" measure function, and a per-node "context" of a user-defined type
393- The `Taffy` tree is now a generic `TaffyTree<T>` where `T` is the "context" type.
394- The measure function is now called for all leaf nodes (nodes without children). If you wish to maintain compatibility with the previous
395  behaviour then your measure function should return `Size::ZERO` for leaf nodes whose context is `None`.
396
397If you are not using measure functions, then the only change you will need to make is from:
398
399```rust
400let mut tree = Taffy::new();
401```
402
403to
404
405```rust
406let mut tree : TaffyTree<()> = TaffyTree::new();
407```
408
409And generally update any uses of `Taffy` in your codebase to `TaffyTree<()>`.
410
411If you are using measure functions then you will need to make some bigger (but straightforward) changes. The following Taffy 0.3 code:
412
413```rust
414let mut tree = Taffy::new();
415let leaf = tree.new_leaf_with_measure(
416  Style::DEFAULT,
417  |known_dimensions: Size<Option<f32>>, available_space: Size<AvailableSpace>| Size { width: 100.0, height: 200.0 }
418);
419tree.compute_layout(leaf, Size::MAX_CONTENT);
420```
421
422Should become something like the following with Taffy 0.4:
423
424```rust
425let mut tree : TaffyTree<Size> = TaffyTree::new();
426let leaf = tree.new_leaf_with_context(Style::DEFAULT, Size { width: 100.0, height: 200.0 });
427tree.compute_layout_with_measure(
428  leaf,
429  Size::MAX_CONTENT,
430  |known_dimensions: Size<Option<f32>>, available_space: Size<AvailableSpace>, node_id: NodeId, node_context: Option<Size>| {
431    node_context.unwrap_or(Size::ZERO)
432  }
433);
434```
435
436Note that:
437
438- You can choose any type instead of `Size` in the above example. This includes your own custom type (which can be an enum or a trait object).
439- If you don't need a context then you can use `()` for the context type
440- As the single "global" measure function passed to `compute_layout_with_measure` only needs to exist for the duration of a single layout run,
441  it can (mutably) borrow data from it's environment
442
443### Low-level API (`LayoutTree` trait) refactor
444
445The low-level API has been completely reworked:
446
447- The `LayoutTree` trait has been split into 5 smaller traits which live in the `taffy::tree:traits` module (along with their associated documentation)
448- The following methods have been removed from split `LayoutTree` traits entirely: `parent`, `is_childless`, `measure_node`, `needs_measure`, and `mark_dirty`.
449- `taffy::node::Node` has been replaced with `taffy::NodeId`. This should make it much easier to implement the low-level traits as the underlying type backing the node id now a `u64` rather than a `slotmap::DefaultKey`.
450- Support for running each layout algorithm individually on a single node via the following top-level functions:
451  - `compute_flexbox_layout`
452  - `compute_grid_layout`
453  - `compute_block_layout`
454  - `compute_leaf_layout`
455  - `compute_root_layout`
456  - `compute_hidden_layout`
457
458It is believed that nobody was previously using the low-level API so we are not providing a migration guide. However, along with the refactor we have greatly
459improved both the documentation and have added examples using the new API, both of which are linked to from the [main documentation page](https://docs.rs/taffy).
460
461### Module hierarchy changes
462
463The specific changes are detailed below. However for most users the most significant change will be that almost all types are now re-exported from the root module. This means that module specific imports like `use taffy::layout::Layout` can now in almost all cases be replaced with the simpler `use taffy::Layout`.
464
465Specific changes:
466
467- The `math` module has been made private
468- The `axis` module has been merged into the `geometry` module
469- The debug module is no longer public. The `print_tree` function is now accessible under `util`.
470- All types from the `node`, `data`, `layout`, `error` and `cache` modules have been moved to the  the `tree` module.
471- The `layout_flexbox()` function has been removed from the prelude. Use `taffy::compute_flexbox_layout` instead.
472
473### Many APIs have been renamed to replace `points` or `Points` with `length` or `Length`
474
475This new name better describes one-dimensional measure of space in some unspecified unit
476which is often unrelated to the PostScript point or the CSS `pt` unit.
477
478This also removes a misleading similarity with the 2D `Point`,
479whose components can have any unit and are not even necessarily absolute lengths.
480
481Example usage change:
482
483```diff
484 use taffy::prelude::*;
485
486 // …
487
488 let header_node = taffy
489     .new_leaf(
490         Style {
491-            size: Size { width: points(800.0), height: points(100.0) },
492+            size: Size { width: length(800.0), height: length(100.0) },
493             ..Default::default()
494         },
495     ).unwrap();
496```
497
498### Other Changes
499
500- The `Taffy` type was renamed to `TaffyTree` and made generic of a context parameter
501- The Flexbox algorithm has now been moved behind the `flexbox` feature. The `flexbox` feature is enabled by default.
502- The `justify_self` property has been moved behind the `grid` feature.
503- Fixed misspelling: `RunMode::PeformLayout` renamed into `RunMode::PerformLayout` (added missing `r`).
504- `serde` dependency has been made compatible with `no_std` environments
505- `slotmap` dependency has been made compatible with `no_std` environments
506- Added `insert_child_at_index()` method to the `TaffyTree`. This can be used to insert a child node at any position instead of just the end.
507- Added `total_node_count()` method to the `TaffyTree` which returns the total number of nodes in the tree.
508- Added `get_disjoint_node_context_mut()` method to the `TaffyTree`. This can be used to safely get multiple mutable borrows at the same time.
509
510## 0.3.19
511
512### Fixes
513
514- Fix compilation error in `evenly_sized_tracks` style helper in recent versions of rustc caused by a change/regression in type
515  inference (#643). Note that 3rd-party code that call style helpers that take an `Into<f32>` parameter may still be affected by this issue,
516  but they should be able to fix on their side by clarifying the type passed in
517
518## 0.3.18
519
520### Fixes
521
522- Fix computation of Flexbox automatic minimum size when grid or flexbox child has an explicit width/height style set (#576)
523
524## 0.3.17
525
526### Added
527
528- Added `total_node_count` method to the `Taffy` struct. Returns the total number of nodes in the tree.
529
530## 0.3.16
531
532### Fixes
533
534- Improve performance of flexbox columns
535
536## 0.3.15
537
538### Fixes
539
540- Fix justify-content and align-content when free space is negative (content overflows container) (#549) (#551)
541
542## 0.3.14
543
544### Fixes
545
546- Flex: Fix issue where constraints were not being propagated, causing nodes with inherent aspect-ratio (typically images) to not apply that aspect-ratio (#545) (Fixes bevyengine/bevy#9841)
547
548## 0.3.13
549
550### Fixes
551
552- Fix rounding accumulation bug (#521) (Fixes #501 and bevyengine/bevy#8911)
553- Flexbox: pass correct cross-axis available space when computing an item's intrinsic main size (#522)(Fixes bevyengine/bevy#9350)
554- Flexbox: Subtract child margin not parent margin when computing stretch-alignment known size
555- Grid: Make CSS Grid algorithm correctly apply max width/height and available space when it is the root node (#491)
556- Grid: Fix CSS Grid "auto track" / placement bugs #481
557  - Fix divide by zero when using grid_auto_rows/grid_auto_columns with zero negative implicit tracks
558  - Fix over counting of tracks (leading to incorrect container heights) when auto-placing in grids that contain negative implicit tracks.
559  - Fix axis conflation in auto-placement code when grid_auto_flow is column
560  - Fix assignment of auto track sizes when initializing negative implicit tracks
561- Leaf: Apply margins to leaf nodes when computing available space for measure functions
562- Leaf: Reserve space for padding/borders in nodes with measure functions (#497)
563  
564  **NOTE: This has the potential to break layouts relying on the old behaviour.** However, such layouts would be relying on a style having no effect, so it is judged that such layouts are unlikely to exist in the wild. If this turns out not to be true then this fix will be reverted on the 0.3.x branch.
565
566### Dependencies
567
568- Upgrade `grid` to `0.10`. This eliminates the transitive dependency on `no-std-compat`.
569
570## 0.3.12
571
572### Fixes
573
574- Fix caching issue when toggling `display:none` on and off
575
576## 0.3.11
577
578### Fixes
579
580- Fix exponential blowup when laying out trees containing nodes with min and max sizes.
581
582## 0.3.10
583
584### Fixes
585
586- Fix sizing of children when the available_space < min_size (#407)
587
588## 0.3.9
589
590### Fixes
591
592- Fix caching bug where a cached result would sometimes be incorrectly used when the amount of available space increased (bevyengine/bevy#8111) and (bevyengine/bevy#8124)
593
594## 0.3.8
595
596### Fixes
597
598- Fix incorrect min-content size for `flex-wrap: wrap` nodes (bevyengine/bevy#8082)
599
600## 0.3.7
601
602### Fixes
603
604- Fix: Make `padding` and `border` floor node sizes (#372)
605- Fix: Prevent percentages contributing to min-content sizes (#388) (also fixes bevyengine/bevy#8017)
606
607## 0.3.6
608
609### Fixes
610
611- Fix: Ignore `align_content` when `flex_wrap` is set to `nowrap` (#383)
612
613## 0.3.5
614
615### Fixes
616
617- Fix `display: none` when it is set on a flexbox child (#380)
618- Fix `display: none` when it is set on a grid child (#381)
619
620## 0.3.4
621
622### Fixes
623
624- Fix `display: none` when it is set for the only node in the hierarchy (#377)
625
626## 0.3.3
627
628### Added
629
630- Added `enable_rounding` and `disable_rounding` methods to the `Taffy` struct which enable consumers of Taffy to obtain unrounded `f32` values for the computed layouts if they want them. Rounding remains enabled by default.
631
632### Fixes
633
634- Fixed rounding algorithm such that it never leaves gaps between adjacent nodes (#369)
635- Fixed compiling with the `grid` feature disabled (#370)
636- Fixed compiling with the `std` feature disabled
637
638## 0.3.2
639
640### Fixes
641
642- Allow partial nested values to be deserialized into a `Style` using the `serde` feature.
643
644## 0.3.1
645
646### Fixes
647
648- The `serde` feature now works when the `grid` feature is enabled
649
650## 0.3.0
651
652### Highlights
653
654- [CSS Grid algorithm support](#new-feature-css-grid)
655- [Style helper functions](#new-feature-style-helpers)
656
657See below for details of breaking changes.
658
659### New Feature: CSS Grid
660
661We very excited to report that we now have support for CSS Grid layout. This is in addition to the existing Flexbox layout support, and the two modes interoperate. You can set a node to use Grid layout by setting the `display` property to `Display::Grid`.
662
663#### Learning Resources
664
665Taffy implements the CSS Grid specification faithfully, so documentation designed for the web should translate cleanly to Taffy's implementation. If you are interested in learning how to use CSS Grid, we would recommend the following resources:
666
667- [CSS Grid Garden](https://cssgridgarden.com/). This is an interactive tutorial/game that allows you to learn the essential parts of CSS Grid in a fun engaging way.
668- [A Complete Guide To CSS Grid](https://css-tricks.com/snippets/css/complete-guide-grid/) by CSS Tricks. This is detailed guide with illustrations and comprehensive written explanation of the different Grid properties and how they work.
669
670#### Supported Features & Properties
671
672In addition to the usual sizing/spacing properties (size, min_size, padding, margin, etc), the following Grid style properties are supported on Grid Containers:
673
674| Property                  | Explanation                                                                                    |
675| ---                       | ---                                                                                            |
676| [`grid-template-columns`] | The track sizing functions of the grid's explicit columns                                      |
677| [`grid-template-rows`]    | The track sizing functions of the grid's explicit rows                                         |
678| [`grid-auto-rows`]        | Track sizing functions for the grid's implicitly generated rows                                |
679| [`grid-auto-columns`]     | Track sizing functions for the grid's implicitly generated columns                             |
680| [`grid-auto-flow`]        | Whether auto-placed items are placed row-wise or column-wise. And sparsely or densely.         |
681| [`gap`]                   | The size of the vertical and horizontal gaps between grid rows/columns                         |
682| [`align-content`]         | Align grid tracks within the container in the inline (horizontal) axis                         |
683| [`justify-content`]       | Align grid tracks within the container in the block (vertical) axis                            |
684| [`align-items`]           | Align the child items within their grid areas in the inline (horizontal) axis                  |
685| [`justify-items`]         | Align the child items within their grid areas in the block (vertical) axis                     |
686
687And the following Grid style properties are supported on Grid Items (children):
688
689| Property                  | Explanation                                                                                    |
690| ---                       | ---                                                                                            |
691| [`grid-row`]              | The (row) grid line the item starts at (or a span)                                             |
692| [`grid-column`]           | The (column) grid line the item end at (or a span)                                             |
693| [`align-self`]            | Align the item within it's grid area in the inline (horizontal) axis. Overrides `align-items`. |
694| [`justify-self`]          | Align the item within it's grid area in the block (vertical) axis. Overrides `justify-items`.  |
695
696[`grid-template-columns`]: https://developer.mozilla.org/en-US/docs/Web/CSS/grid-template-columns
697[`grid-template-rows`]: https://developer.mozilla.org/en-US/docs/Web/CSS/grid-template-rows
698[`grid-auto-rows`]: https://developer.mozilla.org/en-US/docs/Web/CSS/grid-auto-rows
699[`grid-auto-columns`]: https://developer.mozilla.org/en-US/docs/Web/CSS/grid-auto-columns
700[`grid-auto-flow`]: https://developer.mozilla.org/en-US/docs/Web/CSS/grid-auto-flow
701[`gap`]: https://developer.mozilla.org/en-US/docs/Web/CSS/gap
702[`align-content`]: https://developer.mozilla.org/en-US/docs/Web/CSS/align_content
703[`justify-content`]: https://developer.mozilla.org/en-US/docs/Web/CSS/justify_content
704[`align-items`]: https://developer.mozilla.org/en-US/docs/Web/CSS/align-items
705[`justify-items`]: https://developer.mozilla.org/en-US/docs/Web/CSS/justify-items
706[`grid-row`]: https://developer.mozilla.org/en-US/docs/Web/CSS/grid-row
707[`grid-column`]: https://developer.mozilla.org/en-US/docs/Web/CSS/grid-column
708[`align-self`]: https://developer.mozilla.org/en-US/docs/Web/CSS/align-self
709[`justify-self`]: https://developer.mozilla.org/en-US/docs/Web/CSS/justify-self
710
711The following properties and features are not currently supported:
712
713- Subgrids
714- Masonry grid layout
715- Named grid lines
716- Named areas: `grid-template-areas` and `grid-area`
717- `grid-template` or `grid` shorthand
718
719#### Example
720
721See [examples/grid_holy_grail.rs](https://github.com/DioxusLabs/taffy/blob/main/examples/grid_holy_grail.rs) for an example using Taffy to implement the so-called [Holy Grail Layout](https://en.wikipedia.org/wiki/Holy_grail_(web_design)). If you want to run this example, the don't forget the enable the CSS Grid cargo feature:
722
723```bash
724cargo run --example grid_holy_grail --features grid
725```
726
727### New Feature: Style Helpers
728
729Ten new helper functions have added to the taffy prelude. These helper functions have short, intuitive names, and have generic return types which allow them to magically return the correct type depending on context. They make defining styles much easier, and means you won't typically need to use types like `Dimension` or `TrackSizingFunction` directly.
730
731For example, instead of:
732
733```rust
734let size : Size<Dimension> = Size { width: Dimension::Points(100.0), height: Dimension::Percent(50.0) };
735```
736
737you can now write
738
739```rust
740let size : Size<Dimension> = Size { width: points(100.0), height: percent(50.0) };
741```
742
743And that same helper function will work other types like `LengthPercentage` and `MinTrackSizingFunction` that also have a `Points` variant. There are also generic impl's for `Size<T>`, `Rect<T>` and `Line<T>` which means if your node is the same size in all dimensions you can even write
744
745```rust
746let size : Size<Dimension> = points(100.0);
747```
748
749Available style helpers:
750
751<table>
752  <thead><tr><th>Type(s)</th><th colspan="2">Helpers that work with that type</th></tr></thead>
753  <tbody>
754    <tr>
755      <td rowspan="3"><code>LengthPercentage</code></td>
756      <td><code>zero()</code></td>
757      <td>Generates a <code>Points</code> variant with the value <code>0.0</code></td>
758    </tr>
759    <tr>
760      <td><code>points(val:&nbsp;f32)</code></td>
761      <td>Generates a <code>Points</code> variant with the specified value</td>
762    </tr>
763    <tr>
764      <td><code>percent(val:&nbsp;f32)</code></td>
765      <td>Generates a <code>Percent</code> variant with the specified value.<br />Note that the scale of 0-1 not 0-100.</td>
766    </tr>
767    <tr>
768      <td rowspan="2"><code>LengthPercentageAuto</code><br /><code>Dimension</code></td>
769      <td colspan="2"><i>All helpers from <code>LengthPercentage</code> and...</i></td>
770    </tr>
771    <tr>
772      <td><code>auto()</code></td>
773      <td>Generates an <code>Auto</code> variant</td>
774    </tr>
775    <tr>
776      <td rowspan="3"><code>MinTrackSizingFunction</code></td>
777      <td colspan="2"><i>All helpers from <code>LengthPercentageAuto</code>/<code>Dimension</code> and...</i></td>
778    </tr>
779    <tr>
780      <td><code>min_content()</code></td>
781      <td>Generates an <code>MinContent</code> variant</td>
782    </tr>
783      <tr>
784      <td><code>max_content()</code></td>
785      <td>Generates an <code>MinContent</code> variant</td>
786    </tr>
787    <tr>
788      <td rowspan="3"><code>MaxTrackSizingFunction</code></td>
789      <td colspan="2"><i>All helpers from <code>MinTrackSizingFunction</code> and...</i></td>
790    </tr>
791    <tr>
792      <td><code>fit_content(limit:&nbsp;LengthPercentage)</code></td>
793      <td>Generates a <code>FitContent</code> variant with the specified limit.<br />Nest the <code>points</code> or <code>percent</code> helper inside this function to specified the limit.</td>
794    </tr>
795      <tr>
796      <td><code>fr(fraction:&nbsp;f32)</code></td>
797      <td>Generates a <code>Fraction</code> (<code>fr</code>) variant with the specified flex fraction </td>
798    </tr>
799    <tr>
800      <td rowspan="3"><code>NonRepeatingTrackSizingFunction</code></td>
801      <td colspan="2"><i>All helpers from <code>MaxTrackSizingFunction</code> and...</i></td>
802    </tr>
803    <tr>
804      <td><code>minmax(min: MinTrackSizingFunction, max: MaxTrackSizingFunction)</code></td>
805      <td>Equivalent to CSS <code>minmax()</code> function.</td>
806    </tr>
807    <tr>
808      <td><code>flex(fraction:&nbsp;f32)</code></td>
809      <td>Equivalent to CSS <code>minmax(0px, 1fr)</code>. This is likely what you want if you want evenly sized rows/columns.</td>
810    </tr>
811    <tr>
812      <td rowspan="2"><code>TrackSizingFunction</code></td>
813      <td colspan="2"><i>All helpers from <code>NonRepeatingTrackSizingFunction</code> and...</i></td>
814    </tr>
815    <tr>
816      <td><code>repeat(rep: GridTrackRepetition, tracks: Vec&lt;TrackSizingFunction&gt;)</code></td>
817      <td>Equivalent to css <code>repeat()</code> function.</td>
818    </tr>
819    <tr>
820      <td><code>Vec&lt;TrackSizingFunction&gt;</code></td>
821      <td><code>evenly_sized_tracks(count:&nbsp;u16)</code></td>
822      <td>Equivalent to CSS <code>repeat(count, minmax(0px, 1fr)</code></td>
823    </tr>
824    <tr>
825      <td rowspan="3"><code>AvailableSpace</code></td>
826      <td><code>auto()</code></td>
827      <td>Generates an <code>Auto</code> variant</td>
828    </tr>
829    <tr>
830      <td><code>min_content()</code></td>
831      <td>Generates an <code>MinContent</code> variant</td>
832    </tr>
833      <tr>
834      <td><code>max_content()</code></td>
835      <td>Generates an <code>MinContent</code> variant</td>
836    </tr>
837    <tr>
838      <td><code>Size&lt;T&gt;</code></td>
839      <td colspan="2">Any helper that works for <code>T</code> will also work for <code>Size&lt;T&gt;</code> and will set both <code>width</code> and <code>height</code> to that value</td>
840    </tr>
841    <tr>
842      <td><code>Rect&lt;T&gt;</code></td>
843      <td colspan="2">Any helper that works for <code>T</code> will also work for <code>Rect&lt;T&gt;</code> and will set <code>top</code>, <code>left</code>, <code>bottom</code>, and <code>right</code> to that value</td>
844    </tr>
845  </tbody>
846</table>
847
848### Breaking API changes
849
850#### Changes to alignment style types
851
852- `AlignContent` and `JustifyContent` has been merged.
853  - `JustifyContent` is now an alias of `AlignContent` and contains the `Stretch` variant.
854  - This variant will be *ignored* (falling back to `Start`) when applied Flexbox containers. It is valid value for Grid containers.
855- `AlignItems` and `AlignSelf` have been merged.
856  - The `Auto` variant of `AlignSelf` has been removed. You should now use `Option::None` if you wish to specify `AlignSelf::Auto`.
857  - `AlignSelf` is now an alias of `AlignItems`.
858  - `JustifyItems` and `JustifySelf` aliases have been added. These properties have no affect on Flexbox containers, but apply to Grid containers.
859- `Default` impls have been removed from all alignment types. This is because the correct default varies by property, and the types are now shared between multiple properties. The `Style` struct still has a default for each alignment property, so this is considered unlikely to affect you in practice.
860
861#### Strict style types
862
863- New types `LengthPercentage` and `LengthPercentageAuto` have been added.
864  - `LengthPercentage` is like `Dimension` but only contains the `Points` and `Percent` variants, which allows us to increase type safety for properties that don't support the `Auto` value.
865  - `LengthPercentageAuto` is currently identical to `Dimension` but will allow us to expand dimension in future to support values like `MinContent`, `MaxContent` and `FitContent`.
866- Some style properties have been updated to use either `LengthPercentage` or `LengthPercentageAuto` instead of `Dimension`. You will need to update your code, but it is recommended that you use the new style helpers (see above) rather than using the new types directly (although you certainly can use them directly if you want to).
867
868#### Position properties renamed
869
870- The `position` property is now renamed to `inset` and is now in line with [CSS inset specs](https://developer.mozilla.org/en-US/docs/Web/CSS/inset)
871- The `position_type` property is now renamed to `position` and is now in line with [CSS position specs](https://developer.mozilla.org/en-US/docs/Web/CSS/position). The `PositionType` enum has been similarly renamed to `Position`.
872
873#### Changes to `LayoutTree`
874
875- Added generic associated type to `LayoutTree` for a `ChildIter`, an iterator on the children of a given node.
876- Changed the `children` method of `LayoutTree` to return the `ChildIter` generic associated type to allow for custom tree storage implementations which do not store the children of a node contiguously.
877- Added `child_count`  method to `LayoutTree` for querying the number of children of a node. Required because the `children` method now returns an iterator instead of an array.
878- Added `is_childless` method to `LayoutTree` for querying whether a node has no children.
879
880#### `AvailableSpace` has been moved
881
882The `AvailableSpace` enum has been moved from the `layout` module to the `style` module. If you are importing it via the prelude then you will unaffected by the change.
883
884### Fixes
885
886- Flexbox nodes sized under a min-content constraint now size correctly (#291)
887- Aspect ratio is now applied correctly in many circumstances
888- Absolutely positioned items now apply margins correctly
889- Min/max size are now applied correctly
890- Inset applied incorrectly to relatively positioned flexbox children when both `top` and `bottom` or `left` and `right` were specified (#348)
891- Fix case where column-gap style could be used in place of row-gap style (when using a percentage gap with an indefinite container size)
892
893### Removed
894
895- Removed `top_from_points`, `bot_from_points`, `top_from_percent`, and `bot_from_percent` methods removed from `Rect<Dimension>`. These functions were incredibly specific for an unusual use case, so we would be surprised if anyone was using them. Please use the new style helpers instead.
896- Removed `min_main_size`, `max_main_size`, `min_cross_size`, `max_cross_size`, and `cross_size` methods from `Style`. Use the more general `cross` and `main` methods directly on the `size`, `min_size`, and `max_size` properties instead.
897- Removed `main_margin_start`, `main_margin_end`, `cross_margin_start`, `cross_margin_end` from `Style`. Use the more general `main_start`, `main_end`, `cross_start`, and `cross_end` on the `margin` property instead.
898
899## 0.2.2
900
901### Fixes
902
903- Border or padding on the horizontal axis could, in some cases, increase the height of nodes.
904
905## 0.2.1
906
907### Fixes
908
909- In case of conflicts, `min_size` now overrides `max_size` which overrides `size` (#261). This is the behaviour specified in the CSS specification, and was also the behaviour in Taffy `v0.1.0`, but a regression was introduced in Taffy `v0.2.0`.
910- `taffy::compute_layout` has been made public allowing Taffy to be used with custom storage (#263)
911
912## 0.2.0
913
914### New features
915
916#### Flexbox "gap" and `AlignContent::SpaceEvenly`
917
918The [gap](https://developer.mozilla.org/en-US/docs/Web/CSS/gap) property is now supported on flex containers. This can make it much easier to create even spacing or "gutters" between nodes.
919
920Additionally we have a `SpaceEvenly` variant to the `AlignContent` enum to support evenly spaced justification in the cross axis (equivalent to  `align-content: space-evenly` in CSS)
921
922#### Debug module and cargo feature
923
924Two debugging features have been added:
925
926- `taffy::debug::print_tree(&Taffy, root)` - This will print a debug representation of the computed layout of an entire node tree (starting at `root`), which can be useful for debugging layouts.
927- A cargo feature `debug`. This enabled debug logging of the layout computation process itself (this is probably mainly useful for those working taffy itself).
928
929### Performance improvements
930
931A number of performance improvements have landed since taffy 0.1:
932
933- Firstly, our custom `taffy::forest` storage implementation was ripped out and replaced with a much simpler implementation using the `slotmap` crate. This led to performance increases of up to 90%.
934- Secondly, the caching implementation was improved by upping the number of cache slots from 2 to 4 and tweaking how computed results are allocated to cache slots to better match the actual usage patterns of the flexbox layout algorithm. This had a particularly dramatic effect on deep hierarchies (which often involve recomputing the same results repeatedly), fixing the exponential blowup that was previously exhibited on these trees and improving performance by over 1000x in some cases!
935
936#### Benchmarks vs. Taffy 0.1
937
938| Benchmark                                 | Taffy 0.1 | Taffy 0.2 | % change (0.1 -> 0.2) |
939| ---                                       | ---       | ---       | ---                   |
940| wide/1_000 nodes (2-level hierarchy)      | 699.18 µs | 445.01 µs | -36.279%              |
941| wide/10_000 nodes (2-level hierarchy)     | 8.8244 ms | 7.1313 ms | -16.352%              |
942| wide/100_000 nodes (2-level hierarchy)    | 204.48 ms | 242.93 ms | +18.803%              |
943| deep/4000 nodes (12-level hierarchy))     | 5.2320 s  | 2.7363 ms | -99.947%              |
944| deep/10_000 nodes (14-level hierarchy)    | 75.207 s  | 6.9415 ms | -99.991%              |
945| deep/100_000 nodes (17-level hierarchy)   | -         | 102.72 ms | -                     |
946| deep/1_000_000 nodes (20-level hierarchy) | -         | 799.35 ms | -                     |
947
948(note that the table above contains multiple different units (milliseconds vs. microseconds vs. nanoseconds))
949
950As you can see, we have actually regressed slightly in the "wide" benchmarks (where all nodes are siblings of a single parent node). Although it should be noted our results in these benchmarks are still very fast, especially on the 10,000 node benchmark which we consider to be the most realistic size where the result is measured in microseconds.
951
952However, in the "deep" benchmarks we see dramatic improvements. The previous version of Taffy suffered from exponential blowup in the case of deeply nested hierarchies. This has resulted in somewhat silly improvements like the 10,000 node (14-level) hierarchy where Taffy 0.2 is a full 1 million times faster than Taffy 0.1. We've also included results with larger numbers of nodes (although you're unlikely to need that many) to demonstrate that this scalability continues up to even deeper levels of nesting.
953
954#### Benchmarks vs. [Yoga](https://github.com/facebook/yoga)
955
956Yoga benchmarks run via it's node.js bindings (the `yoga-layout-prebuilt` npm package), they were run a few times manually and it was verified that variance in the numbers of each run was minimal. It should be noted that this is using an old version of Yoga.
957
958| Benchmark | Yoga | Taffy 0.2 |
959| --- | --- | --- |
960| yoga/10 nodes (1-level hierarchy) | 45.1670 µs | 33.297 ns |
961| yoga/100 nodes (2-level hierarchy) | 134.1250 µs | 336.53 ns |
962| yoga/1_000 nodes (3-level hierarchy) | 1.2221 ms | 3.8928 µs |
963| yoga/10_000 nodes (4-level hierarchy) | 13.8672 ms | 36.162 µs |
964| yoga/100_000 nodes (5-level hierarchy) | 141.5307 ms | 1.6404 ms |
965
966(note that the table above contains multiple different units (milliseconds vs. microseconds vs. nanoseconds))
967
968While we're trying not to get too excited (there could easily be an issue with our benchmarking methodology which make this an unfair comparison), we are pleased to see that we seem to be anywhere between 100x and 1000x times faster depending on the node count!
969
970### Breaking API changes
971
972#### Node creation changes
973
974- `taffy::Node` is now unique only to the Taffy instance from which it was created.
975- Renamed `Taffy.new_node(..)` -> `Taffy.new_with_children(..)`
976- Renamed `Taffy.new_leaf()` -> `Taffy.new_leaf_with_measure()`
977- Added `taffy::node::Taffy.new_leaf()` which allows the creation of new leaf-nodes without having to supply a measure function
978
979#### Error handling/representation improvements
980
981- Renamed `taffy::Error` -> `taffy::error::TaffyError`
982- Replaced `taffy::error::InvalidChild` with a new `InvalidChild` variant of `taffy::error::TaffyError`
983- Replaced `taffy::error::InvalidNode` with a new `InvalidNode` variant of `taffy::error::TaffyError`
984- The following method new return `Err(TaffyError::ChildIndexOutOfBounds)` instead of panicking:
985  - `taffy::Taffy::remove_child_at_index`
986  - `taffy::Taffy::replace_child_at_index`
987  - `taffy::Taffy::child_at_index`
988- `Taffy::remove` now returns a `Result<usize, Error>`, to indicate if the operation was successful (and if it was, which ID was invalidated).
989
990#### Some uses of `Option<f32>` replaced with a new `AvailableSpace` enum
991
992A new enum `Taffy::layout::AvailableSpace` has been added.
993
994The definition looks like this:
995
996```rust
997/// The amount of space available to a node in a given axis
998pub enum AvailableSpace {
999    /// The amount of space available is the specified number of pixels
1000    Definite(f32),
1001    /// The amount of space available is indefinite and the node should be laid out under a min-content constraint
1002    MinContent,
1003    /// The amount of space available is indefinite and the node should be laid out under a max-content constraint
1004    MaxContent,
1005}
1006```
1007
1008This enum is now used instead of `Option<f32>` when calling `Taffy.compute_layout` (if you previously passing `Size::NONE` to `compute_layout`, then you will need to change this to `Size::MAX_CONTENT`).
1009
1010And a different instance of it is passed as a new second parameter to `MeasureFunc`. `MeasureFunc`s may choose to use this parameter in their computation or ignore it as they see fit. The canonical example of when it makes sense to use it is when laying out text. If `MinContent` has been passed in the axis in which the text is flowing (i.e. the horizontal axis for left-to-right text), then you should line-break at every possible opportunity (e.g. all word boundaries), whereas if `MaxContent` has been passed then you shouldn't line break at all..
1011
1012#### Builder methods are now `const` where possible
1013
1014- Several convenience constants have been defined: notably `Style::DEFAULT`
1015- `Size<f32>.zero()` is now `Size::<f32>::ZERO`
1016- `Point<f32>.zero()` is now  `Point::<f32>::ZERO`
1017- `Size::undefined()` is now `Size::NONE`
1018
1019#### Removals
1020
1021- Removed `taffy::forest::Forest`. `taffy::node::Taffy` now handles it's own storage using a slotmap (which comes with a performance boost up to 90%).
1022- Removed `taffy::number::Number`. Use `Option<f32>` is used instead
1023  - the associated public `MinMax` and `OrElse` traits have also been removed; these should never have been public
1024- Removed unused dependencies `hashbrown`, `hash32`, and `typenum`. `slotmap` is now the only required dependency (`num_traits` and `arrayvec` are also required if you wish to use taffy in a `no_std` environment).
1025
1026### Fixes
1027
1028- Miscellaneous correctness fixes which align our implementation with Chrome:
1029
1030  - Nodes can only ever have one parent
1031  - Fixed rounding of fractional values to follow latest Chrome - values are now rounded the same regardless of their position
1032  - Fixed computing free space when using both `flex-grow` and a minimum size
1033  - Padding is now only subtracted when determining the available space if the node size is unspecified, following [section 9.2.2 of the flexbox spec](https://www.w3.org/TR/css-flexbox-1/#line-sizing)
1034  - `MeasureFunc` (and hence `NodeData` and hence `Forest` and hence the public `Taffy` type) are now `Send` and `Sync`, enabling their use in async and parallel applications
1035- Taffy can now be vendored using `cargo-vendor` (README.md is now included in package).
1036
1037## 0.1.0
1038
1039### 0.1.0 Changed
1040
1041- the `order` field of `Layout` is now public, and describes the relative z-ordering of nodes
1042- renamed crate from `stretch2` to `taffy`
1043- updated to the latest version of all dependencies to reduce upstream pain caused by duplicate dependencies
1044- renamed `stretch::node::Stretch` -> `taffy::node::Taffy`
1045
1046### 0.1.0 Fixed
1047
1048- fixed feature strategy for `alloc` and `std`: these can now be compiled together, with `std`'s types taking priority
1049
1050### 0.1.0 Removed
1051
1052- removed Javascript / Kotlin / Swift bindings
1053  - the maintainer team lacks expertise to keep these working
1054  - more serious refactors are planned, and this will be challenging to keep working through that process
1055  - if you are interested in helping us maintain bindings to other languages, [get in touch](https://github.com/DioxusLabs/taffy/discussions)!
1056- the `serde_camel_case` and `serde_kebab_case` features have been removed: they were poorly motivated and were not correctly additive (if both were enabled compilation would fail)
1057- removed the `Direction` and `Overflow` structs, and the corresponding `direction` and `overflow` fields from `Style`
1058  - these had no effect in the current code base and were actively misleading
1059
1060## stretch2 0.4.3
1061
1062This is the final release of `stretch`: migrate to the crate named `taffy` for future fixes and features!
1063
1064These notes describe the differences between this release and `stretch` 0.3.2, the abandoned crate from which this library was forked.
1065
1066### Changed
1067
1068- updated [assorted dependencies](https://github.com/vislyhq/stretch/commit/a6491117379cea52dedc9584d892594a143e8cb0)
1069
1070### Fixed
1071
1072- fixed an exponential performance blow-up with deep nesting
1073- fixed percent height values, which were using parent width
1074- recomputing layout no longer moves children of non-zero-positioned parent
1075- fixed broken Swift bindings