`CupertinoPicker` new onChanged behaviour #170202

alex-medinsh · 2025-06-07T17:12:15Z

This PR adds a new behaviour to ListWheelScrollView that allows to switch between reporting changes on scroll update or only on scroll end.
CupertinoPicker now has a changeReportingBehavior param that forwards to ListWheelScrollView.

New behaviour is a breaking change if set as default, so I have added the changeReportingBehavior param to opt-in. My idea is that it can be marked as Deprecated immediately and then removed from CupertinoPicker later or we can just leave the param there and make it more customizable.

I am open to other ideas on how to land this without breaking clients.

Fixes #170201

Pre-launch Checklist

I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
I read the [Tree Hygiene] wiki page, which explains my responsibilities.
I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].
I signed the [CLA].
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is [test-exempt].
I followed the [breaking change policy] and added [Data Driven Fixes] where supported.
All existing and new tests are passing.

alex-medinsh · 2025-06-07T20:22:17Z

I might try to also make these changes for CupertinoDatePicker depending on how this one goes.

packages/flutter/lib/src/cupertino/picker.dart

alex-medinsh · 2025-06-17T16:40:54Z

@MitchellGoodwin am I understanding correctly that you are ok with landing this as-is and breaking in a later PR?

MitchellGoodwin

LGTM with one nit. Thank you for the change!

packages/flutter/lib/src/widgets/list_wheel_scroll_view.dart

MitchellGoodwin · 2025-06-17T22:56:03Z

@MitchellGoodwin am I understanding correctly that you are ok with landing this as-is and breaking in a later PR?

Yup!

packages/flutter/lib/src/cupertino/picker.dart

…0202)

Roll Flutter from 8303a96 to 85a9b4f (93 revisions) flutter/flutter@8303a96...85a9b4f 2025-06-19 engine-flutter-autoroll@skia.org Roll Skia from af242598f14d to 794936b23812 (2 revisions) (flutter/flutter#170875) 2025-06-19 gourabkumarsi@google.com Drop support for 21/22 Lollipop (flutter/flutter#170748) 2025-06-19 engine-flutter-autoroll@skia.org Roll Dart SDK from 6020126c10e8 to bce9abe03175 (1 revision) (flutter/flutter#170872) 2025-06-19 engine-flutter-autoroll@skia.org Roll Skia from df97f7f407db to af242598f14d (4 revisions) (flutter/flutter#170867) 2025-06-19 engine-flutter-autoroll@skia.org Roll Skia from 1d8f7ebd23cc to df97f7f407db (5 revisions) (flutter/flutter#170864) 2025-06-19 engine-flutter-autoroll@skia.org Roll Dart SDK from 4ab716b09e9d to 6020126c10e8 (1 revision) (flutter/flutter#170862) 2025-06-19 engine-flutter-autoroll@skia.org Roll Skia from 291d41414fa7 to 1d8f7ebd23cc (2 revisions) (flutter/flutter#170857) 2025-06-19 engine-flutter-autoroll@skia.org Roll Dart SDK from b32559bca3cc to 4ab716b09e9d (9 revisions) (flutter/flutter#170855) 2025-06-19 jessy.yameogo@gmail.com remove --start-paused flag by default and set useDwdsWebSocketConnect… (flutter/flutter#170612) 2025-06-18 matanlurey@users.noreply.github.com Engine builders no longer require `is_fusion` (flutter/flutter#170849) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from 5f110d5f48a3 to 291d41414fa7 (2 revisions) (flutter/flutter#170836) 2025-06-18 robert.ancell@canonical.com Use a shared vertex buffer for rendering layers. (flutter/flutter#170717) 2025-06-18 30870216+gaaclarke@users.noreply.github.com fixes deeplinking in uiscenedelegate migrated projects (flutter/flutter#170452) 2025-06-18 jonahwilliams@google.com [Impeller] fix array uniforms on GLES backend. (flutter/flutter#170710) 2025-06-18 chinmaygarde@google.com [Impeller] Update README to add section about custom embedders. (flutter/flutter#170077) 2025-06-18 jason-simmons@users.noreply.github.com Escape the forbidden strings in the regex used to check test command output (flutter/flutter#170702) 2025-06-18 30870216+gaaclarke@users.noreply.github.com License cpp jun16 (flutter/flutter#170716) 2025-06-18 chinmaygarde@google.com Work around newer compilers requiring the satisfaction of three-way comparison of EncodableValue. (flutter/flutter#170822) 2025-06-18 45459898+RamonFarizel@users.noreply.github.com Update didUnmountRenderObject text description (flutter/flutter#169628) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from 297dbc32a6c7 to 5f110d5f48a3 (2 revisions) (flutter/flutter#170821) 2025-06-18 matanlurey@users.noreply.github.com Add an initial "Using feature flags" doc for the team. (flutter/flutter#170767) 2025-06-18 34465683+rkishan516@users.noreply.github.com Feat: Add mouse cursor for CupertinoDialogAction (flutter/flutter#169051) 2025-06-18 matanlurey@users.noreply.github.com Update `Engine-artifacts.md` to reflect flutter/cocoon/4785 (flutter/flutter#170751) 2025-06-18 alex.medinsh@gmail.com `CupertinoPicker` new onChanged behaviour (flutter/flutter#170202) 2025-06-18 pateltirth454@gmail.com Rename `entryPointBaseUrl` to `entrypointBaseUrl` (flutter/flutter#170166) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from 1cb13a21b547 to 297dbc32a6c7 (4 revisions) (flutter/flutter#170809) 2025-06-18 engine-flutter-autoroll@skia.org Roll Packages from 25d4fa4 to 715a0a5 (2 revisions) (flutter/flutter#170808) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from 0a106c038cd0 to 1cb13a21b547 (1 revision) (flutter/flutter#170801) 2025-06-18 derekx@google.com Add `--profile-microtasks` switch (flutter/flutter#170690) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from ff7fffa5dac5 to 0a106c038cd0 (3 revisions) (flutter/flutter#170795) 2025-06-18 87239766+thakaredipali@users.noreply.github.com Add example for CupertinoExpansionTile transition modes (flutter/flutter#170335) 2025-06-18 stanleycocoa@gmail.com feat: Add radius to DividerThemeData. (flutter/flutter#169739) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from 75af9450b121 to ff7fffa5dac5 (3 revisions) (flutter/flutter#170772) 2025-06-17 98614782+auto-submit[bot]@users.noreply.github.com Reverts "add run_gradle_lock_files_check.dart for new PR's that modify gradle files (#169245)" (flutter/flutter#170770) 2025-06-17 30870216+gaaclarke@users.noreply.github.com Started bridging the scene delegate to the lifecycle delegate for shortcuts (flutter/flutter#170180) 2025-06-17 jonahwilliams@google.com [ui] npot display_list allocation. (flutter/flutter#170447) 2025-06-17 kevmoo@users.noreply.github.com Prefer .of over .from (flutter/flutter#170750) 2025-06-17 47866232+chunhtai@users.noreply.github.com Fix RawGestureDetector semantics (flutter/flutter#170549) 2025-06-17 runar@socialscreen.no Use correct type for filterIdentifier (flutter/flutter#170343) 2025-06-17 matanlurey@users.noreply.github.com Remove and inline `license_header.txt` (flutter/flutter#170475) 2025-06-17 muhatashim@google.com add run_gradle_lock_files_check.dart for new PR's that modify gradle files (flutter/flutter#169245) 2025-06-17 engine-flutter-autoroll@skia.org Roll Dart SDK from 4fad61257b29 to b32559bca3cc (3 revisions) (flutter/flutter#170746) 2025-06-17 kevinjchisholm@google.com [release] Sync stable changelog to master (flutter/flutter#170691) 2025-06-17 engine-flutter-autoroll@skia.org Roll Packages from 03a6abb to 25d4fa4 (5 revisions) (flutter/flutter#170743) 2025-06-17 bkonyi@google.com [ Widget Preview ] Remove support for synthetic package:flutter_gen (flutter/flutter#170602) 2025-06-17 engine-flutter-autoroll@skia.org Roll Skia from 8879db3b3319 to 75af9450b121 (4 revisions) (flutter/flutter#170739) ...

This PR updates the docs after the changes introduced in #170202. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.

…or (#170793) This PR adds the new `changeReportingBehavior` parameter to `CupertinoDatePicker` and `CupertinoTimerPicker`. Continuation of #170202 Fixes #92644 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.

This PR adds a new behaviour to `ListWheelScrollView` that allows to switch between reporting changes on scroll update or only on scroll end. `CupertinoPicker` now has a `changeReportingBehavior` param that forwards to `ListWheelScrollView`. New behaviour is a breaking change if set as default, so I have added the `changeReportingBehavior` param to opt-in. My idea is that it can be marked as `Deprecated` immediately and then removed from `CupertinoPicker` later or we can just leave the param there and make it more customizable. I am open to other ideas on how to land this without breaking clients. Fixes flutter#170201 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.

This PR updates the docs after the changes introduced in flutter#170202. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.

…or (flutter#170793) This PR adds the new `changeReportingBehavior` parameter to `CupertinoDatePicker` and `CupertinoTimerPicker`. Continuation of flutter#170202 Fixes flutter#92644 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.

Roll Flutter from 8303a96 to 85a9b4f (93 revisions) flutter/flutter@8303a96...85a9b4f 2025-06-19 engine-flutter-autoroll@skia.org Roll Skia from af242598f14d to 794936b23812 (2 revisions) (flutter/flutter#170875) 2025-06-19 gourabkumarsi@google.com Drop support for 21/22 Lollipop (flutter/flutter#170748) 2025-06-19 engine-flutter-autoroll@skia.org Roll Dart SDK from 6020126c10e8 to bce9abe03175 (1 revision) (flutter/flutter#170872) 2025-06-19 engine-flutter-autoroll@skia.org Roll Skia from df97f7f407db to af242598f14d (4 revisions) (flutter/flutter#170867) 2025-06-19 engine-flutter-autoroll@skia.org Roll Skia from 1d8f7ebd23cc to df97f7f407db (5 revisions) (flutter/flutter#170864) 2025-06-19 engine-flutter-autoroll@skia.org Roll Dart SDK from 4ab716b09e9d to 6020126c10e8 (1 revision) (flutter/flutter#170862) 2025-06-19 engine-flutter-autoroll@skia.org Roll Skia from 291d41414fa7 to 1d8f7ebd23cc (2 revisions) (flutter/flutter#170857) 2025-06-19 engine-flutter-autoroll@skia.org Roll Dart SDK from b32559bca3cc to 4ab716b09e9d (9 revisions) (flutter/flutter#170855) 2025-06-19 jessy.yameogo@gmail.com remove --start-paused flag by default and set useDwdsWebSocketConnect… (flutter/flutter#170612) 2025-06-18 matanlurey@users.noreply.github.com Engine builders no longer require `is_fusion` (flutter/flutter#170849) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from 5f110d5f48a3 to 291d41414fa7 (2 revisions) (flutter/flutter#170836) 2025-06-18 robert.ancell@canonical.com Use a shared vertex buffer for rendering layers. (flutter/flutter#170717) 2025-06-18 30870216+gaaclarke@users.noreply.github.com fixes deeplinking in uiscenedelegate migrated projects (flutter/flutter#170452) 2025-06-18 jonahwilliams@google.com [Impeller] fix array uniforms on GLES backend. (flutter/flutter#170710) 2025-06-18 chinmaygarde@google.com [Impeller] Update README to add section about custom embedders. (flutter/flutter#170077) 2025-06-18 jason-simmons@users.noreply.github.com Escape the forbidden strings in the regex used to check test command output (flutter/flutter#170702) 2025-06-18 30870216+gaaclarke@users.noreply.github.com License cpp jun16 (flutter/flutter#170716) 2025-06-18 chinmaygarde@google.com Work around newer compilers requiring the satisfaction of three-way comparison of EncodableValue. (flutter/flutter#170822) 2025-06-18 45459898+RamonFarizel@users.noreply.github.com Update didUnmountRenderObject text description (flutter/flutter#169628) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from 297dbc32a6c7 to 5f110d5f48a3 (2 revisions) (flutter/flutter#170821) 2025-06-18 matanlurey@users.noreply.github.com Add an initial "Using feature flags" doc for the team. (flutter/flutter#170767) 2025-06-18 34465683+rkishan516@users.noreply.github.com Feat: Add mouse cursor for CupertinoDialogAction (flutter/flutter#169051) 2025-06-18 matanlurey@users.noreply.github.com Update `Engine-artifacts.md` to reflect flutter/cocoon/4785 (flutter/flutter#170751) 2025-06-18 alex.medinsh@gmail.com `CupertinoPicker` new onChanged behaviour (flutter/flutter#170202) 2025-06-18 pateltirth454@gmail.com Rename `entryPointBaseUrl` to `entrypointBaseUrl` (flutter/flutter#170166) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from 1cb13a21b547 to 297dbc32a6c7 (4 revisions) (flutter/flutter#170809) 2025-06-18 engine-flutter-autoroll@skia.org Roll Packages from 25d4fa4 to 715a0a5 (2 revisions) (flutter/flutter#170808) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from 0a106c038cd0 to 1cb13a21b547 (1 revision) (flutter/flutter#170801) 2025-06-18 derekx@google.com Add `--profile-microtasks` switch (flutter/flutter#170690) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from ff7fffa5dac5 to 0a106c038cd0 (3 revisions) (flutter/flutter#170795) 2025-06-18 87239766+thakaredipali@users.noreply.github.com Add example for CupertinoExpansionTile transition modes (flutter/flutter#170335) 2025-06-18 stanleycocoa@gmail.com feat: Add radius to DividerThemeData. (flutter/flutter#169739) 2025-06-18 engine-flutter-autoroll@skia.org Roll Skia from 75af9450b121 to ff7fffa5dac5 (3 revisions) (flutter/flutter#170772) 2025-06-17 98614782+auto-submit[bot]@users.noreply.github.com Reverts "add run_gradle_lock_files_check.dart for new PR's that modify gradle files (#169245)" (flutter/flutter#170770) 2025-06-17 30870216+gaaclarke@users.noreply.github.com Started bridging the scene delegate to the lifecycle delegate for shortcuts (flutter/flutter#170180) 2025-06-17 jonahwilliams@google.com [ui] npot display_list allocation. (flutter/flutter#170447) 2025-06-17 kevmoo@users.noreply.github.com Prefer .of over .from (flutter/flutter#170750) 2025-06-17 47866232+chunhtai@users.noreply.github.com Fix RawGestureDetector semantics (flutter/flutter#170549) 2025-06-17 runar@socialscreen.no Use correct type for filterIdentifier (flutter/flutter#170343) 2025-06-17 matanlurey@users.noreply.github.com Remove and inline `license_header.txt` (flutter/flutter#170475) 2025-06-17 muhatashim@google.com add run_gradle_lock_files_check.dart for new PR's that modify gradle files (flutter/flutter#169245) 2025-06-17 engine-flutter-autoroll@skia.org Roll Dart SDK from 4fad61257b29 to b32559bca3cc (3 revisions) (flutter/flutter#170746) 2025-06-17 kevinjchisholm@google.com [release] Sync stable changelog to master (flutter/flutter#170691) 2025-06-17 engine-flutter-autoroll@skia.org Roll Packages from 03a6abb to 25d4fa4 (5 revisions) (flutter/flutter#170743) 2025-06-17 bkonyi@google.com [ Widget Preview ] Remove support for synthetic package:flutter_gen (flutter/flutter#170602) 2025-06-17 engine-flutter-autoroll@skia.org Roll Skia from 8879db3b3319 to 75af9450b121 (4 revisions) (flutter/flutter#170739) ...

…0202)

…or (flutter#170793) This PR adds the new `changeReportingBehavior` parameter to `CupertinoDatePicker` and `CupertinoTimerPicker`. Continuation of flutter#170202 Fixes flutter#92644 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.

This PR updates the docs after the changes introduced in flutter#170202. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.

…or (flutter#170793) This PR adds the new `changeReportingBehavior` parameter to `CupertinoDatePicker` and `CupertinoTimerPicker`. Continuation of flutter#170202 Fixes flutter#92644 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.

github-actions bot added framework flutter/packages/flutter repository. See also f: labels. f: scrolling Viewports, list views, slivers, etc. f: cupertino flutter/packages/flutter/cupertino repository labels Jun 7, 2025

alex-medinsh mentioned this pull request Jun 7, 2025

The timing of the Haptic Feedback triggered by CupertinoPicker is incorrect. #169606

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CupertinoDatePicker and CupertinoTimerPicker new onChanged behavior #170793

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2593166 CupertinoPicker new onChanged behaviour (flutter/flutter#17…

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…0202)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Aug 14, 2025

2593166 CupertinoPicker new onChanged behaviour (flutter/flutter#17…

58c0095

…0202)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Aug 15, 2025

2593166 CupertinoPicker new onChanged behaviour (flutter/flutter#17…

4929bdf

…0202)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Aug 15, 2025

2593166 CupertinoPicker new onChanged behaviour (flutter/flutter#17…

797e756

…0202)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Aug 16, 2025

2593166 CupertinoPicker new onChanged behaviour (flutter/flutter#17…

ab4fff2

…0202)

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`CupertinoPicker` new onChanged behaviour #170202

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