| commit | 7d2af474b17108797a50ff4fe1584192ed344fb7 | [log] [tgz] |
|---|---|---|
| author | Doris Liu <tianliu@google.com> | Thu Feb 02 13:18:17 2023 -0800 |
| committer | Doris Liu <tianliu@google.com> | Tue Jun 13 09:35:25 2023 -0700 |
| tree | fe3b78971028c345797ce6d2a5c743cf03ed46d3 | |
| parent | a5cd10f73c42f21bb7f84a451f1dfce662c13219 [diff] |
Support lookahead in LazyList This change creates an optimized behavior for lookahead pass and post-lookahead pass in LazyList. More specifically: - Items are retained until they are no longer needed for either pass - Lookahead pass will maintain the source of truth for scroll position. The scroll position in post-lookahead pass will only be temporarily different than lookahead pass when there's a scrollback needed to not reveal beyond the bottom of the list. In that case, we'll apply an animation to animate the delta back to 0. - In the rare cases where lookahead pass failed to subcompose all slots needed for postLookahead, they will be composed in post-lookahead. These nodes will have the same lookahead constraints and placement as post-lookahead. - Item placement animations are also updated to ensure lookahead pass skips the animations. Test: New tests added Change-Id: I7cd715c3d71d498f76b8abbe5be9ddad48717419
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