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