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Allow partially visible items to be picked as scroll anchors for maintainVisibleContentPosition - #43203
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This pull request was exported from Phabricator. Differential Revision: D54223244 |
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This pull request was exported from Phabricator. Differential Revision: D54223244 |
…tainVisibleContentPosition Summary: The current behavior for `maintainVisibleContentPosition` on ScrollView is to pick the first fully visible item as the scroll anchor. This has a number of disadvantages: * It causes problems for lists with loading indicators and large items. The loading glimmer can be picked as the anchor and pull the scroll down too quickly. This is the case for Marketplace. * It's inconsistent with the [CSS Scroll Anchoring](https://www.w3.org/TR/css-scroll-anchoring-1/) behavior, which is to pick the first partially visible view. This change will switch to picking the first partially visible view as the anchor, to align with the CSS implementation. Discussed the change with yungsters, NickGerleman, and cipolleschi and agreed about the change in behavior. This also enables `maintainVisibleContentPosition` for Android. After adding it to `validAttributes` for Android it appears to be working well. Previously it was not functional at all on Android, as the property change from React was not passed to ReactScrollViewManager.java. ## Changelog: [General] [Changed] - maintainVisibleContentPosition property on ScrollView now selects the first partially visible view as the anchor, rather than the first fully visible view. Reviewed By: NickGerleman Differential Revision: D54223244
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This was referenced Oct 7, 2026
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Summary:
The current behavior for
maintainVisibleContentPositionon ScrollView is to pick the first fully visible item as the scroll anchor. This has a number of disadvantages:This change will switch to picking the first partially visible view as the anchor, to align with the CSS implementation.
Discussed the change with yungsters, NickGerleman, and cipolleschi and agreed about the change in behavior.
This also enables
maintainVisibleContentPositionfor Android. After adding it tovalidAttributesfor Android it appears to be working well. Previously it was not functional at all on Android, as the property change from React was not passed to ReactScrollViewManager.java.Changelog:
[General] [Changed] - maintainVisibleContentPosition property on ScrollView now selects the first partially visible view as the anchor, rather than the first fully visible view.
Differential Revision: D54223244