ScrollableState.animateScrollBy does not preserve velocity when interrupting a previous call [220119990]

Bug

Status Update

No update yet.

Description

kl...@google.com

created issue #1

Feb 17, 2022 03:07PM

If ScrollableState.animateScrollBy is called and then before it completes it is called again in another coroutine, the first animation will be cancelled before starting the second one. However, unlike calls to Animatable.animateTo, the velocity of the previous animation will not be preserved.

Possible solutions

This isn't a trivial fix because ScrollableState itself does not keep any animation or velocity state – animateScrollBy is an extension function. It also does not provide any signal about whether it's being scrolled by an animation or the user, so if we track the velocity externally then we could end up in a weird state if the user interrupts an animation.

Option 1: Move `animateScrollBy` into `ScrollableState`

This would allow ScrollableState to keep track of animated scroll velocity internally. It should also allow it to be reset to zero when the animation is interrupted by a user scroll. However, ScrollableState is a public interface so to avoid breaking binary compatibility we would need to wait for Kotlin 1.6.20 and then give it a default implementation. The default implementation could simply be the current implementation.

Option 2: Expose scroll velocity from `ScrollableState`

I'm not sure how feasible this is – tracking velocity requires tracking timestamps, which ScrollableState does not currently do and would probably make the API super gross.

Comments

kl...@google.com <kl...@google.com> #2Jun 14, 2022 06:06PM

Accepted by kl...@google.com.

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

commit 0154910724cdc44253af1d2f8cede76264783226
Author: Aurimas Liutikas <aurimas@google.com>
Date: Thu Jun 27 15:25:02 2024

Expand native target support for annotation and collection libraries

- Enable watchos and tvos download in importMaven
- Add support for watchos and tvos targets in AndroidXMultiplatformExtension
- Enable watchos and tvos in :annotation:annotation
- Enable linuxArm64, watchos, and tvos in :collection:collection

This work is required as we work towards setting up native stubs for
compose projects.

Test: ./gradlew collection:collection:publish
Bug: 349894318
Change-Id: Idfd1faa3a826bb91ee14722f7437bdcf99cf0018

M annotation/annotation/build.gradle
M buildSrc/private/src/main/kotlin/androidx/build/AndroidXMultiplatformExtension.kt
M buildSrc/public/src/main/kotlin/androidx/build/KmpPlatforms.kt
M collection/collection/build.gradle
M development/build_log_simplifier/messages.ignore
M development/importMaven/src/main/kotlin/androidx/build/importMaven/KmpConfig.kt

https://android-review.googlesource.com/3151736

ap...@google.com <ap...@google.com> #3Jul 7, 2022 08:56PM

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

commit 39cd1e9f7579513bde139c17f9c51f9012d56152
Author: Aurimas Liutikas <aurimas@google.com>
Date: Thu Jun 27 15:25:02 2024

Expand native target support for annotation and collection libraries

Reland

r.android.com/3151736 now with workaround for

https://youtrack.jetbrains.com/issue/KT-62653

- Enable watchos and tvos download in importMaven
- Add support for watchos and tvos targets in AndroidXMultiplatformExtension
- Enable watchos and tvos in :annotation:annotation
- Enable linuxArm64, watchos, and tvos in :collection:collection

This work is required as we work towards setting up native stubs for
compose projects.

Test: ./gradlew collection:collection:publish
Bug: 349894318
Change-Id: Ic795af8486db48b31633799e06665717d08398db

M annotation/annotation/build.gradle
M buildSrc/private/src/main/kotlin/androidx/build/AndroidXMultiplatformExtension.kt
M buildSrc/public/src/main/kotlin/androidx/build/KmpPlatforms.kt
M collection/collection/build.gradle
M development/build_log_simplifier/messages.ignore
M development/importMaven/src/main/kotlin/androidx/build/importMaven/KmpConfig.kt

https://android-review.googlesource.com/3156121

kl...@google.com <kl...@google.com> #4Aug 5, 2022 01:51AM

Assigned to le...@google.com.

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

commit c3a06e79cf427aef1cf0ede1bacb463eb89472be
Author: Aurimas Liutikas <aurimas@google.com>
Date: Thu Jun 27 15:25:02 2024

Expand native target support for annotation and collection libraries

Reland

r.android.com/3151736 /

r.android.com/3156121 but now with
moving to project(":annotation:annotation") in commonMain as due to

https://youtrack.jetbrains.com/issue/KT-62653 we cannot depend on
project in one source set and prebuilt in the other.

- Enable watchos and tvos download in importMaven
- Add support for watchos and tvos targets in AndroidXMultiplatformExtension
- Enable watchos and tvos in :annotation:annotation
- Enable linuxArm64, watchos, and tvos in :collection:collection

This work is required as we work towards setting up native stubs for
compose projects.

Test: ./gradlew collection:collection:publish
Bug: 349894318
Change-Id: I7f2a1bddbe79ab5e920cdb01ca6a428950a8c2c3

M annotation/annotation/build.gradle
M buildSrc/private/src/main/kotlin/androidx/build/AndroidXMultiplatformExtension.kt
M buildSrc/public/src/main/kotlin/androidx/build/KmpPlatforms.kt
M busytown/androidx_multiplatform_mac_host_tests_arm64.sh
M camera/integration-tests/avsynctestapp/build.gradle
M collection/collection/build.gradle
M development/build_log_simplifier/messages.ignore
M development/importMaven/src/main/kotlin/androidx/build/importMaven/KmpConfig.kt
M test/uiautomator/integration-tests/testapp/build.gradle
M wear/compose/integration-tests/navigation/build.gradle

https://android-review.googlesource.com/3156423

le...@google.com <le...@google.com> May 22, 2023 01:22PM

Status: New

Issue 220119990

Description

Possible solutions

Option 1: Move animateScrollBy into ScrollableState

Option 2: Expose scroll velocity from ScrollableState

Issue summary