[Fabric] Implement snapToAlignment property for ScrollView #14841
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…ure (#14830) * Initial plan * Implement snapToAlignment support for Fabric ScrollView - interface and prop handling Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com> * Add test support and UI for snapToAlignment in ScrollView Fabric implementation Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com> * Remove unnecessary changes from vnext/codegen files Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com> * Change files * Run yarn change prerelease, yarn lint:fix, and yarn format as requested Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com> * Remove all changes from vnext/codegen files as requested Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com> * Remove XAML dependency from IDL by defining local SnapAlignment enum Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com> * Extract snap alignment conversion into separate function for better readability Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com> * Revert changes to ScrollViewExample.js as requested Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com> * Revert changes to ScrollViewComponentTest.test.ts as requested Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com>
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vnext/Microsoft.ReactNative/Fabric/Composition/ScrollViewComponentView.cpp
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vnext/Microsoft.ReactNative/Fabric/Composition/CompositionContextHelper.cpp
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Add this case to scrollview/samples |
anupriya13
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Description
Type of Change
Why
Implement snapToAlignment property for ScrollView in Fabric
Resolves #13148
What
Implement snapToAlignment property for ScrollView in Fabric
https://reactnative.dev/docs/scrollview#snaptoalignment
Background
The
snapToAlignmentproperty was available in RNW Paper via ScrollViewManager but missing from the Fabric implementation, causing a parity gap between the two architectures.Screenshots
Recording.2025-07-09.122123.mp4
Testing
Tested in playground and e2etestappfabric already added
Changes
Core Implementation
CompositionSwitcher.idlto acceptsnapToAlignmentparameterScrollViewComponentView.cppwith proper enum conversion from React Native to Windows typesConfigureSnapInertiaModifiers()to adjust snap positions based on alignment:"start"(Near): No adjustment - content snaps at natural positions"center"(Center): Offsets positions by half viewport size - content centers in viewport"end"(Far): Offsets positions by full viewport size - content aligns to end of viewportEnum Mapping
Changelog
Should this change be included in the release notes: YES
Add a brief summary of the change to use in the release notes for the next release.
Implement snapToAlignment property for ScrollView in Fabric
Microsoft Reviewers: Open in CodeFlow