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Add macOS-specific scroll physics#108298

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moffatman:macos_physics
Sep 19, 2022
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Add macOS-specific scroll physics#108298
auto-submit[bot] merged 5 commits intoflutter:masterfrom
moffatman:macos_physics

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@moffatman moffatman commented Jul 25, 2022

image

Dotted line = BouncingScrollPhysics
Solid line = new BouncingDesktopScrollPhysics
X-marks = Recorded data

Fixes #107752

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  • I listed at least one issue that this PR fixes in the description above.
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@flutter-dashboard flutter-dashboard bot added f: gestures flutter/packages/flutter/gestures repository. f: scrolling Viewports, list views, slivers, etc. framework flutter/packages/flutter repository. See also f: labels. labels Jul 25, 2022
@goderbauer goderbauer requested a review from Piinks July 26, 2022 22:13
@tomgilder tomgilder mentioned this pull request Jul 29, 2022
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@moffatman moffatman mentioned this pull request Jul 30, 2022
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hellohuanlin commented Aug 1, 2022

im having trouble understanding this graph. is y-axis the initial distance or initial speed?

@Piinks Piinks added platform-mac Building on or for macOS specifically a: desktop Running on desktop a: fidelity Matching the OEM platforms better labels Aug 1, 2022
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moffatman commented Aug 2, 2022

im having trouble understanding this graph. is y-axis the initial distance or initial speed?

The y-axis is velocity

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Piinks commented Aug 9, 2022

Thanks so much for this @moffatman! And apologies for the delay, I should be finished reviewing today

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You want to update the getScrollPhysics of CupertinoScrollBehavior as well. 👍

packages/flutter/lib/src/gestures/velocity_tracker.dart Outdated
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In the docs for the iOS version, there is a reference to https://developer.apple.com/documentation/uikit/uiscrollviewdelegate/1619385-scrollviewwillenddragging, is that also relevant here? Or is there another, more relevant reference?

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There isn't a direct analogue, in AppKit the scroll momentum state is seen based on the incoming events' [NSEvent momentumPhase]. The part which converts the velocity to the momentum is not exposed at all.

@goderbauer goderbauer requested a review from Piinks August 23, 2022 22:09
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This is looking really good. Apologies for the delay while I was gone.

packages/flutter/lib/src/physics/friction_simulation.dart Outdated
Comment on lines +20 to +24
double g = guess;
for (int i = 0; i < iterations; i++) {
g = g - (f(g) - target) / df(g);
}
return g;
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The style guide discourages abbreviations https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#avoid-abbreviations

Can you expand this shorthand so it is easier to understand?

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This is really great, thank you for your incredible attention to detail. :)
LGTM!

@Piinks Piinks added the autosubmit Merge PR when tree becomes green via auto submit App label Sep 19, 2022
@auto-submit auto-submit bot merged commit 70b19ff into flutter:master Sep 19, 2022
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70b19ff Add macOS-specific scroll physics (flutter/flutter#108298)
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70b19ff Add macOS-specific scroll physics (flutter/flutter#108298)
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@moffatman moffatman mentioned this pull request Nov 21, 2022
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appinteractive commented Dec 21, 2022

which flutter version will this land in?

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moffatman commented Dec 21, 2022

@appinteractive Has been in beta channel for a while, should be in the next stable version 3.7. No idea when that releases though

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hellohuanlin commented Dec 21, 2022

IIRC next release will be around next Jan @appinteractive

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appinteractive commented Dec 22, 2022 •
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Thanks for the response, tried it in 3.7 pre but I still have scroll that has way to little friction on macOS, do I need to specify anything for it to work? Using MaterialApp as a base because Cupertino is barely usable with plugins. (Missing Material)

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moffatman commented Dec 22, 2022

@appinteractive Can you share some code which reproduces the issue? If you are setting custom scroll physics on any widget, the correct physics for macOS should be BouncingScrollPhysics(decelerationRate: ScrollDecelerationRate.fast). But if you never set physics on any widget, it should be getting the correct physics by default.

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GroovinChip commented Jan 27, 2023 •
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@Piinks After the release of Flutter 3.7 with this included, I'm seeing The Scrollbar's ScrollController has no ScrollPosition attached. errors for apps using macos_ui. I assume I need to remove or alter some of the custom scrolling code in the library, but my efforts so far haven't yielded any results. I read the desktop scrolling migration guide and I am only more confused. Should I remove all usages of our custom MacosScrollbar, as well as our custom MacosScrollBehavior?

EDIT: It's also worth mentioning that the errors I'm getting do not trace which scrollable the issue is arising from :/

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Piinks commented Jan 27, 2023

Hi @GroovinChip, it sounds like there may be a regression. Can you please file an issue with the last flutter version you were using and a minimal reproduction?
We won’t be able to diagnose a potential regression in an old PR.

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GroovinChip commented Jan 27, 2023

@Piinks Sure thing! Didn't realize it could be a regression :)

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GroovinChip commented Jan 27, 2023

Hi @GroovinChip, it sounds like there may be a regression. Can you please file an issue with the last flutter version you were using and a minimal reproduction? We won’t be able to diagnose a potential regression in an old PR.

Done - #119323

@xu-baolin xu-baolin mentioned this pull request Feb 7, 2023
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a: desktop Running on desktop a: fidelity Matching the OEM platforms better 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. platform-mac Building on or for macOS specifically

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Scrolling with trackpad continues momentum animation for too long

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