commit | 90ea6ba03895eb0d5959423f0a9bf0ffa4279e06 | [log] [tgz] |
---|---|---|
author | Dustin Lam <dustinlam@google.com> | Mon Jan 25 22:39:11 2021 -0800 |
committer | Dustin Lam <dustinlam@google.com> | Wed Jan 27 17:41:57 2021 -0800 |
tree | ea089894d7b6e597064497f37c4615e6b70e40fa | |
parent | 0df60266c209525c51c9daf402cacead4b76d4a3 [diff] |
Estimate counting loaded items when all pages in presenter are dropped This handles the rare scenario where pages are dropped so fast in fetcher, that all pages in the presenter no longer exist in fetcher and then it processes viewport hints before presenter receives any of the drop events. In the prepend case, this normally leads to OOB due to reading directly from loaded pages in fetcher, but in the append case will just skip the count causing an incorrect number of items to be loaded. As a workaround, this change simply clamps the count for pages that would normally be associated with fulfilling prefetchDistance, and estimates items to load using PagingConfig.pageSize. However once presenter catches up with fetcher it should bind items and new viewport hints to allow eventual consistency. Test: ./gradlew paging:paging-common:test Fixes: 178448265 Change-Id: I99ac230f0910cf1bb7232d9999d9767f052a6ecb
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