IssueTracker

Project: platform/frameworks/support
Branch: androidx-main

commit 4bb5026491f04f591f29e3baccafed1cc41a54f5
Author: Andrey Kulikov <andreykulikov@google.com>
Date:   Fri Apr 16 17:08:52 2021

    Preparation for allowing SubcomposeLayoutState hoisting
   
    In this cl we decrease the amount of public members in SubcomposeLayoutState class by not implementing SubcomposeMeasureScope and RememberObserver anymore.
   
    Bug: 184940225
    Test: run SubcomposeLayoutTest
    Change-Id: I42642be1b8373792b6db6075b2121b64388696c2

M       compose/ui/ui/src/commonMain/kotlin/androidx/compose/ui/layout/SubcomposeLayout.kt

https://android-review.googlesource.com/1678089

Project: platform/frameworks/support
Branch: androidx-main

commit 804e0e63fcaaba34c88f24faa2bb3b93fffd826c
Author: Andrey Kulikov <andreykulikov@google.com>
Date:   Fri Apr 16 17:51:44 2021

    Add precomposing logic for SubcomposeLayout
   
    This will allow to add the prefetching logic during the scroll of LazyColumn/Row
   
    Relnote: Introduces ability to hoist the SubcomposeLayout state which allows you to precompose the content into a requires slotId which would make the next measure pass faster as once we try to subcompose with the given slotId next time there will be no composition needed.
    Bug: 184940225
    Bug: 185784787
    Test: new tests in SubcomposeLayoutTest
    Change-Id: I425806be5ec3e36337e04558e6621fbe515b7cd8

M       compose/ui/ui/api/1.0.0-beta07.txt
M       compose/ui/ui/api/current.txt
M       compose/ui/ui/api/public_plus_experimental_1.0.0-beta07.txt
M       compose/ui/ui/api/public_plus_experimental_current.txt
M       compose/ui/ui/api/restricted_1.0.0-beta07.txt
M       compose/ui/ui/api/restricted_current.txt
M       compose/ui/ui/src/androidAndroidTest/kotlin/androidx/compose/ui/layout/SubcomposeLayoutTest.kt
M       compose/ui/ui/src/commonMain/kotlin/androidx/compose/ui/layout/SubcomposeLayout.kt
M       compose/ui/ui/src/commonMain/kotlin/androidx/compose/ui/node/LayoutNode.kt

https://android-review.googlesource.com/1678090

Project: platform/frameworks/support
Branch: androidx-main

commit 4f9e6724f169845b9ce6cb375a23a23b8beab574
Author: Andrey Kulikov <andreykulikov@google.com>
Date:   Fri Apr 16 18:12:56 2021

    Lazy list prefetch
   
    Introducing the mechanism for prefetching the next item during the scrolling of LazyColumn/Row. The logic is pretty much the same as the one used in RecyclerView:
    After every scroll we calculate what is the next index which would be visible if we continue scrolling the same direction and schedule the prefetching work after the frame. After every frame there could be a gap before the next frame is scheduled to be started. We can use this time to do extra work. In our case we would pre-compose the item which is about to be visible. This makes the frame which will need to introduce the new item with the given index faster as the composition pass is done already.
    This change decreases the median frame time of TrivialListScrollBenchmark(95th percentile) by 35%.
   
    Test: tested with a new LazyListPrefetcherTest and manually
    Relnote: The next visible item prefetching logic is introduced for LazyColumn/Row
    Fixes: 184940225
    Change-Id: I8a4bc52322a5444e3782274822fa6d07f7c1d402

M       compose/foundation/foundation/api/1.0.0-beta07.txt
M       compose/foundation/foundation/api/current.txt
M       compose/foundation/foundation/api/public_plus_experimental_1.0.0-beta07.txt
M       compose/foundation/foundation/api/public_plus_experimental_current.txt
M       compose/foundation/foundation/api/restricted_1.0.0-beta07.txt
M       compose/foundation/foundation/api/restricted_current.txt
M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/LazyGridTest.kt
M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/LazyItemStateRestoration.kt
A       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/LazyListPrefetcherTest.kt
M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/LazyRowTest.kt
A       compose/foundation/foundation/src/androidMain/kotlin/androidx/compose/foundation/lazy/LazyListPrefetcher.android.kt
M       compose/foundation/foundation/src/commonMain/kotlin/androidx/compose/foundation/lazy/LazyList.kt
M       compose/foundation/foundation/src/commonMain/kotlin/androidx/compose/foundation/lazy/LazyListState.kt
M       compose/foundation/foundation/src/desktopMain/kotlin/androidx/compose/foundation/lazy/Lazy.desktop.kt

https://android-review.googlesource.com/1673249