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CSS Grid 1/9: Grid style types and public API#55876

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CSS Grid 1/9: Grid style types and public API#55876
NickGerleman wants to merge 1 commit into
react:mainfrom
NickGerleman:export-D94867121

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Summary:

  • Add foundational data types, enums, style properties, and C API for expressing CSS Grid layouts
  • Includes GridLine.h, GridTrack.h, GridTrackType.h, Display::Grid, new alignment enums (Align::Start/End, Justify::Auto/Stretch/Start/End)
  • C API: YGGridTrackList.h/cpp, YGNodeStyle grid setters/getters
  • Layout helper updates, Node.h relativePosition made public

Split from react/yoga#1865. Part of the CSS Grid implementation series.

X-link: react/yoga#1893

Differential Revision: D94867121

Pulled By: NickGerleman

Summary:
- Add foundational data types, enums, style properties, and C API for expressing CSS Grid layouts
- Includes `GridLine.h`, `GridTrack.h`, `GridTrackType.h`, `Display::Grid`, new alignment enums (`Align::Start/End`, `Justify::Auto/Stretch/Start/End`)
- C API: `YGGridTrackList.h/cpp`, `YGNodeStyle` grid setters/getters
- Layout helper updates, `Node.h` `relativePosition` made public

Split from react/yoga#1865. Part of the CSS Grid implementation series.

X-link: react/yoga#1893

Differential Revision: D94867121

Pulled By: NickGerleman
@meta-cla meta-cla Bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Mar 3, 2026
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@NickGerleman has exported this pull request. If you are a Meta employee, you can view the originating Diff in D94867121.

meta-codesync Bot pushed a commit to react/yoga that referenced this pull request Mar 5, 2026
Summary:
X-link: react/react-native#55876

- Add foundational data types, enums, style properties, and C API for expressing CSS Grid layouts
- Includes `GridLine.h`, `GridTrack.h`, `GridTrackType.h`, `Display::Grid`, new alignment enums (`Align::Start/End`, `Justify::Auto/Stretch/Start/End`)
- C API: `YGGridTrackList.h/cpp`, `YGNodeStyle` grid setters/getters
- Layout helper updates, `Node.h` `relativePosition` made public

Split from #1865. Part of the CSS Grid implementation series.

Changelog: [Internal]

Pull Request resolved: #1893

Reviewed By: sammy-SC

Differential Revision: D94867121

Pulled By: NickGerleman

fbshipit-source-id: adcb6d107cdd782550a614f87f84cff3ecefd806
@meta-codesync meta-codesync Bot closed this in 26cef64 Mar 5, 2026
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This pull request was successfully merged by @intergalacticspacehighway in 26cef64

When will my fix make it into a release? | How to file a pick request?

@facebook-github-bot facebook-github-bot added the Merged This PR has been merged. label Mar 5, 2026
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@NickGerleman merged this pull request in 26cef64.

gabrieldonadel pushed a commit that referenced this pull request Jun 23, 2026
#57241)

* Expose cleanupContentsNodesRecursively for backport

Backport prerequisite: make cleanupContentsNodesRecursively externally
linkable and declare it in CalculateLayout.h so AbsoluteLayout.cpp can
call it. This mirrors the relevant slice of #55876 (26cef64), which
is not present on this branch, and is required before applying #56422
and #57103.

* Fix node ownership when `display: contents` is used (#56422)

Summary:
Pull Request resolved: #56422

Changelog: [GENERAL][FIXED] Fixed Yoga node ownership when `display: contents` is used in absolutely positioned subtrees

Fixes an edge case where nodes with `display: contents` weren't cloned properly inside absolutely positioned subtrees.

Adds a test case covering this scenario.

X-link: react/yoga#1924

Reviewed By: NickGerleman

Differential Revision: D100581579

Pulled By: j-piasecki

fbshipit-source-id: e05e9a4076bd11a71be438ef910a262044659a9b

* Fix `display: contents` nodes having `hasNewLayout` set incorrectly (#57103)

Summary:
Pull Request resolved: #57103

Changelog: [General][Fixed] Fixed `display: contents` nodes having `hasNewLayout` set incorrectly

`cleanupContentsNodesRecursively` unconditionally sets `hasNewLayout=true` on `display: contents` children, including on code paths where their parent's layout was not actually performed in this pass. The stale flag can survive across layout passes and, in clone-on-write renderers (e.g. React Native Fabric), be observed by a subsequent pass whose parent was cloned but whose layout was served from cache, leaving the contents child's owner pointing at the previous parent revision.

There are two paths through which the cleanup could stamp a contents child whose parent's `hasNewLayout` would end up false:

1. Measure-phase visit. Inside `calculateLayoutImpl`, the cleanup ran with no knowledge of `performLayout`. When the parent's `calculateLayoutImpl` was invoked only with `performLayout=false` (cache miss on measure, cache hit on layout), the cleanup stamped contents children even though the parent itself never had its `hasNewLayout` set.

2. Absolute-layout walk. `layoutAbsoluteDescendants` walks every static layout descendant of the containing block - including ones whose own `calculateLayoutImpl` was skipped via the layout-phase cache. The cleanup invoked along that walk unconditionally stamped contents children, but the parent's `hasNewLayout` was only updated when the recursion actually found new layout downstream.

In both cases, the result is the same invariant violation: a contents node with `hasNewLayout=true` whose parent has `hasNewLayout=false`. A consumer iterating the tree via `hasNewLayout` skips the parent and never clears the stale flag.

X-link: react/yoga#1970

Test Plan:
Added `YGContentsNodeHasNewLayoutTest.cpp` with regression tests:
- `contents_child_hasNewLayout_not_stamped_on_measure_only_visit` - pins the measure-phase fix
- `absolute_descendant_through_contents_is_reachable_via_hasNewLayout` - pins the positive case for absolute-layout path
- `absolute_phase_cleanup_does_not_stamp_when_parent_layout_skipped` - pins the negative case for absolute-layout path

Reviewed By: javache

Differential Revision: D107854528

Pulled By: j-piasecki

fbshipit-source-id: cae5e889622296e8b6380a6428509b5ffea3e9ae
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