viewableItems not working correctly with an absolute header
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- Dominant language
- TypeScript
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Description
Description
I use an absolutely positioned header above my FlashList. I tried setting the offset in stickyHeaderConfig or progressViewOffset to match the header height, but the viewableItems from onViewableItemsChanged still include items that are under the header and should not be considered visible.
Current behavior
viewableItems includes items that aren’t actually visible.
Expected behavior
viewableItems should not include items that are under the header.
FlashList version: 2.3.1
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by tracing FlashList's viewability handling for onViewableItemsChanged, then compare how stickyHeaderConfig.offset and progressViewOffset affect visibility calculations. Reproduce the issue with an absolutely positioned header on FlashList 2.3.1; done means viewableItems excludes items covered by that header.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- react-native, typescript
- Domain
- mobile
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100