Improve FlatList estimates for items not yet laid out #46487
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This pull request was exported from Phabricator. Differential Revision: D62649060 |
Summary: Pull Request resolved: facebook#46487 Changelog: [General][Fixed] Fixed accuracy of FlatList estimations to determine what elements are visible in the rendering window. This fixes a bug in FlatList where it thinks that some elements are visible in the rendering window, when they're not. Specifically, if a cell hasn't been laid out yet, it ignores all the information it already has on the ones that had, and estimates its position and offset based on the estimated size of the cells. In this case, if the first element has a larger offset because the list has a header, that offset is ignored in this case. One observed result of this is that in a list where there's a header and a single cell that occupy the whole rendering window, FlatList thinks it needs to pre-render an additional element because the header is ignored. Reviewed By: NickGerleman Differential Revision: D62649060
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This pull request was exported from Phabricator. Differential Revision: D62649060 |
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This pull request was successfully merged by @rubennorte in 40aaeb7 When will my fix make it into a release? | How to file a pick request? |
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Summary:
Changelog: [General][Fixed] Fixed accuracy of FlatList estimations to determine what elements are visible in the rendering window.
This fixes a bug in FlatList where it thinks that some elements are visible in the rendering window, when they're not. Specifically, if a cell hasn't been laid out yet, it ignores all the information it already has on the ones that had, and estimates its position and offset based on the estimated size of the cells. In this case, if the first element has a larger offset because the list has a header, that offset is ignored in this case.
One observed result of this is that in a list where there's a header and a single cell that occupy the whole rendering window, FlatList thinks it needs to pre-render an additional element because the header is ignored.
Differential Revision: D62649060