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Scroll inertia cancel [framework]#106891

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moffatman:inertia
Jul 21, 2022
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Scroll inertia cancel [framework]#106891
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moffatman:inertia

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@moffatman moffatman commented Jun 30, 2022 •
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It's expected behaviour on some platforms that scroll inertia/momentum animations will stop when a finger is rested on the trackpad. This PR reacts to a new kind of pointer signal event (PointerSignalKind.scrollInertiaCancel) to convey that message.

Framework prep PR: #106906

Engine PR [1/4]: flutter/engine#34402

Part of #106979

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  • I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
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  • I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].
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  • I listed at least one issue that this PR fixes in the description above.
  • I updated/added relevant documentation (doc comments with ///).
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@flutter-dashboard flutter-dashboard bot added a: tests "flutter test", flutter_test, or one of our tests f: gestures flutter/packages/flutter/gestures repository. f: scrolling Viewports, list views, slivers, etc. framework flutter/packages/flutter repository. See also f: labels. labels Jun 30, 2022
@moffatman moffatman mentioned this pull request Jun 30, 2022
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@HansMuller HansMuller requested a review from dkwingsmt July 1, 2022 21:43
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@moffatman moffatman force-pushed the inertia branch 2 times, most recently from e840a4c to ccd259b Compare July 8, 2022 04:11
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goderbauer commented Jul 13, 2022

(Triage): Looks like the Engine PR has been submitted, does this one need to be rebased to pick up the engine changes and make the tests happy?

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dkwingsmt commented Jul 13, 2022 •
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This one needs to be merged after flutter/engine#34537 is rolled in. flutter/engine#34537 was waiting for another prerequisite, but should be now ready. Let's get flutter/engine#34537 merged first.

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dkwingsmt reviewed Jul 14, 2022
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Generally okay except for a few questions.

packages/flutter/test/widgets/scrollable_test.dart Outdated
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Can we just record the exact result (and possibly remove the first try)?

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It's dependent on exact scroll friction calculation. I hadn't recorded the exact result since I am working on some related change (the scroll friction right now has been tuned for touch, it causes much more momentum than native trackpad scrolling apps). But I can change it to the exact result now and change again later.

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LGTM

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I guess we don't need the first try any more, since we no longer need the distance to compare with?

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a: tests "flutter test", flutter_test, or one of our tests autosubmit Merge PR when tree becomes green via auto submit App f: gestures flutter/packages/flutter/gestures repository. f: scrolling Viewports, list views, slivers, etc. framework flutter/packages/flutter repository. See also f: labels.

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