Implementing `switch` expressions: everything in `flutter/lib/src/` #143634

nate-thegrate · 2024-02-17T07:28:04Z

This PR is the 9ᵗʰ step in the journey to solve issue #136139 and make the entire Flutter repo more readable.

(previous pull requests: #139048, #139882, #141591, #142279, #142634, #142793, #143293, #143496)

I did a pass through all of packages/flutter/lib/src/ and found an abundance of switch statements to improve. Whereas #143496 focused on in-depth refactoring, this PR is full of simple, straightforward changes. (I ended up making some more complicated changes in rendering/ and will file those separately after this PR is done.)

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.
All existing and new tests are passing.

flutter-dashboard · 2024-02-18T23:47:03Z

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact "@test-exemption-reviewer" in the #hackers channel in Chat (don't just cc them here, they won't see it! Use Discord!).

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

bernaferrari · 2024-02-19T18:46:08Z

packages/flutter/lib/src/material/drawer.dart

  AlignmentDirectional get _drawerInnerAlignment {
-    switch (widget.alignment) {
-      case DrawerAlignment.start:
-        return AlignmentDirectional.centerEnd;
-      case DrawerAlignment.end:
-        return AlignmentDirectional.centerStart;
-    }
+    return switch (widget.alignment) {
+      DrawerAlignment.start => AlignmentDirectional.centerEnd,
+      DrawerAlignment.end => AlignmentDirectional.centerStart,
+    };
  }


Theoretically, if you want things even shorter, I think you could even do:

AlignmentDirectional get _drawerInnerAlignment => switch(...)

Right?

I like using that format for my own projects, but I've been using return switch(...) here to follow the Flutter Style Guide:

only use => when everything, including the function declaration, fits on a single line.

oh! That makes sense. Probably the rule is older than switch :P but still valid. Thanks

One rule down in the style guide there is also this one: https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#use--for-inline-callbacks-that-just-return-literals-or-switch-expressions

So, changing this to what Bernardo suggested would be within the rules of the style guide.

I'm glad that rule includes switch expressions!

I don't think it applies to class getters and methods, but I'll update focus_traversal.dart right now 🙂

goderbauer · 2024-02-20T18:27:54Z

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

-      case CupertinoDatePickerMode.monthYear:
-        return _CupertinoDatePickerMonthYearState(dateOrder: dateOrder);
-    }
+    // ignore: no_logic_in_create_state, https://github.com/flutter/flutter/issues/70499


This ignore made more sense at its old location. Can it be moved back? Or at the very least above the comment?

Unfortunately, it needs to be placed right above the switch expression in order to suppress the warning.

But I was able to reposition the other comments; hopefully it's easier to follow now.

goderbauer · 2024-02-20T18:29:32Z

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

    final TextDirection? textDirection = configuration.textDirection;
    assert(textDirection != null);
-    final double start;
-    final double shadowDirection; // -1 for ltr, 1 for rtl.


This comment was lost in the refactoring, but it is kinda useful. Can you preserve it?

This is one of those borderline cases as far as whether a comment is useful: in my opinion, the switch expression makes it easy to tell that the value of shadowDirection is 1 for rtl and -1 for ltr.

packages/flutter/lib/src/material/ink_well.dart

packages/flutter/lib/src/services/raw_keyboard_fuchsia.dart

Co-authored-by: Loïc Sharma <737941+loic-sharma@users.noreply.github.com>

loic-sharma · 2024-02-20T19:29:14Z

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

+      AxisDirection.down  => Offset(0,  position.pixels),
+      AxisDirection.up    => Offset(0, -position.pixels),
+      AxisDirection.left  => Offset(-position.pixels, 0),
+      AxisDirection.right => Offset( position.pixels, 0),


This looks a bit funky to me, consider instead:

Suggested change

AxisDirection.right => Offset( position.pixels, 0),

AxisDirection.right => Offset(position.pixels, 0),

Or:

Suggested change

AxisDirection.right => Offset( position.pixels, 0),

AxisDirection.right => Offset(position.pixels, 0),

loic-sharma · 2024-02-20T19:29:41Z

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

+    AxisDirection.down  => Offset(0,  scrollableState.position.pixels),
+    AxisDirection.up    => Offset(0, -scrollableState.position.pixels),
+    AxisDirection.left  => Offset(-scrollableState.position.pixels, 0),
+    AxisDirection.right => Offset( scrollableState.position.pixels, 0),


Same comment here as above: https://github.com/flutter/flutter/pull/143634/files#r1496378734

loic-sharma

Awesome improvements, thanks for the contribution!

…/src/` (flutter/flutter#143634)

Manual roll Flutter from 5129806 to efee280 (47 revisions) Manual roll requested by dit@google.com flutter/flutter@5129806...efee280 2024-02-22 engine-flutter-autoroll@skia.org Roll Flutter Engine from bf5c003085fd to 7eeb697687d5 (16 revisions) (flutter/flutter#143911) 2024-02-22 katelovett@google.com Update PR template for dart fix (flutter/flutter#143879) 2024-02-22 katelovett@google.com Re-use methods to calculate leading and trailing garbage in RenderSliverMultiBoxAdaptor (flutter/flutter#143884) 2024-02-21 98614782+auto-submit[bot]@users.noreply.github.com Reverts "[Impeller] Make impeller goldens test blocking. (#143864)" (flutter/flutter#143896) 2024-02-21 jonahwilliams@google.com [Impeller] Make impeller goldens test blocking. (flutter/flutter#143864) 2024-02-21 jonahwilliams@google.com Disable color filter sepia test for Impeller. (flutter/flutter#143861) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 52ffcaadea41 to bf5c003085fd (12 revisions) (flutter/flutter#143875) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 4128895d79a1 to 52ffcaadea41 (1 revision) (flutter/flutter#143862) 2024-02-21 katelovett@google.com Deprecate redundant itemExtent in RenderSliverFixedExtentBoxAdaptor methods (flutter/flutter#143412) 2024-02-21 reidbaker@google.com Add aab as alias for appbundle (flutter/flutter#143855) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from e16f43eeaaa4 to 4128895d79a1 (1 revision) (flutter/flutter#143856) 2024-02-21 engine-flutter-autoroll@skia.org Roll Packages from 8bba41b to 48048f6 (2 revisions) (flutter/flutter#143853) 2024-02-21 tessertaha@gmail.com Update `hourMinuteTextStyle` defaults for Material 3 Time Picker (flutter/flutter#143749) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 93063f61943a to e16f43eeaaa4 (2 revisions) (flutter/flutter#143827) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from ed49634486e9 to 93063f61943a (1 revision) (flutter/flutter#143826) 2024-02-21 tessertaha@gmail.com `CalendarDatePicker` doesn't announce selected date on desktop (flutter/flutter#143583) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 9100d326475a to ed49634486e9 (2 revisions) (flutter/flutter#143824) 2024-02-21 tessertaha@gmail.com Add `timeSelectorSeparatorColor` and `timeSelectorSeparatorTextStyle` for Material 3 Time Picker (flutter/flutter#143739) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from efc69946cb1e to 9100d326475a (2 revisions) (flutter/flutter#143820) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 700250436e3f to efc69946cb1e (2 revisions) (flutter/flutter#143816) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 3557277c575c to 700250436e3f (1 revision) (flutter/flutter#143814) 2024-02-21 jonahwilliams@google.com more fixes to unstable impeller goldens. (flutter/flutter#143811) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from cb12a8cc97a1 to 3557277c575c (2 revisions) (flutter/flutter#143807) 2024-02-21 kevmoo@users.noreply.github.com [flutter_tools] enable wasm compile on beta channel (flutter/flutter#143779) 2024-02-21 simonfv@gmail.com Fix initialization of time in repeat on AnimationController (flutter/flutter#142887) 2024-02-21 jonahwilliams@google.com Disable debug banner to stabilize impeller goldens. (flutter/flutter#143794) 2024-02-21 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Changing `TextPainter.getOffsetForCaret` implementation to remove the logarithmic search (#143281)" (flutter/flutter#143801) 2024-02-20 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Add UI Benchmarks (#143542)" (flutter/flutter#143798) 2024-02-20 31859944+LongCatIsLooong@users.noreply.github.com Avoid applying partial dartfixes on CI (flutter/flutter#143551) 2024-02-20 bernaferrari2@gmail.com Add UI Benchmarks (flutter/flutter#143542) 2024-02-20 engine-flutter-autoroll@skia.org Roll Flutter Engine from 1ae2c10e8071 to cb12a8cc97a1 (1 revision) (flutter/flutter#143791) 2024-02-20 nate.w5687@gmail.com Implement `_suspendedNode` fix (flutter/flutter#143556) 2024-02-20 xubaolin@oppo.com Change `ItemExtentBuilder`'s return value nullable (flutter/flutter#142428) 2024-02-20 engine-flutter-autoroll@skia.org Roll Flutter Engine from 27828054f07a to 1ae2c10e8071 (6 revisions) (flutter/flutter#143783) 2024-02-20 engine-flutter-autoroll@skia.org Roll Flutter Engine from e16a260265ad to 27828054f07a (1 revision) (flutter/flutter#143769) 2024-02-20 jonahwilliams@google.com [gold] Always provide host ABI to gold config (flutter/flutter#143621) 2024-02-20 andrewrkolos@gmail.com instead of exiting the tool, print a warning when using --flavor with an incompatible device (flutter/flutter#143735) 2024-02-20 nate.w5687@gmail.com Implementing `switch` expressions: everything in `flutter/lib/src/` (flutter/flutter#143634) 2024-02-20 31859944+LongCatIsLooong@users.noreply.github.com Changing `TextPainter.getOffsetForCaret` implementation to remove the logarithmic search (flutter/flutter#143281) 2024-02-20 34871572+gmackall@users.noreply.github.com Delete local.properties that shouldn't have been pushed (flutter/flutter#143774) 2024-02-20 polinach@google.com Clean leaks. (flutter/flutter#142818) 2024-02-20 36861262+QuncCccccc@users.noreply.github.com Introduce tone-based surfaces and accent color add-ons - Part 2 (flutter/flutter#138521) 2024-02-20 greg@zulip.com Explain when and why to use CrossAxisAlignment.baseline (flutter/flutter#143632) 2024-02-20 engine-flutter-autoroll@skia.org Roll Flutter Engine from a41da3701923 to e16a260265ad (2 revisions) (flutter/flutter#143763) ...

This pull request fixes #143803 by taking advantage of Dart's null-aware operators. And unlike `switch` expressions ([9 PRs](#143634) and counting), the Flutter codebase is already fantastic when it comes to null-aware coding. After refactoring the entire repo, all the changes involving `?.` and `??` can fit into a single pull request.

) Manual roll Flutter from 5129806 to efee280 (47 revisions) Manual roll requested by dit@google.com flutter/flutter@5129806...efee280 2024-02-22 engine-flutter-autoroll@skia.org Roll Flutter Engine from bf5c003085fd to 7eeb697687d5 (16 revisions) (flutter/flutter#143911) 2024-02-22 katelovett@google.com Update PR template for dart fix (flutter/flutter#143879) 2024-02-22 katelovett@google.com Re-use methods to calculate leading and trailing garbage in RenderSliverMultiBoxAdaptor (flutter/flutter#143884) 2024-02-21 98614782+auto-submit[bot]@users.noreply.github.com Reverts "[Impeller] Make impeller goldens test blocking. (#143864)" (flutter/flutter#143896) 2024-02-21 jonahwilliams@google.com [Impeller] Make impeller goldens test blocking. (flutter/flutter#143864) 2024-02-21 jonahwilliams@google.com Disable color filter sepia test for Impeller. (flutter/flutter#143861) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 52ffcaadea41 to bf5c003085fd (12 revisions) (flutter/flutter#143875) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 4128895d79a1 to 52ffcaadea41 (1 revision) (flutter/flutter#143862) 2024-02-21 katelovett@google.com Deprecate redundant itemExtent in RenderSliverFixedExtentBoxAdaptor methods (flutter/flutter#143412) 2024-02-21 reidbaker@google.com Add aab as alias for appbundle (flutter/flutter#143855) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from e16f43eeaaa4 to 4128895d79a1 (1 revision) (flutter/flutter#143856) 2024-02-21 engine-flutter-autoroll@skia.org Roll Packages from 8bba41b to 48048f6 (2 revisions) (flutter/flutter#143853) 2024-02-21 tessertaha@gmail.com Update `hourMinuteTextStyle` defaults for Material 3 Time Picker (flutter/flutter#143749) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 93063f61943a to e16f43eeaaa4 (2 revisions) (flutter/flutter#143827) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from ed49634486e9 to 93063f61943a (1 revision) (flutter/flutter#143826) 2024-02-21 tessertaha@gmail.com `CalendarDatePicker` doesn't announce selected date on desktop (flutter/flutter#143583) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 9100d326475a to ed49634486e9 (2 revisions) (flutter/flutter#143824) 2024-02-21 tessertaha@gmail.com Add `timeSelectorSeparatorColor` and `timeSelectorSeparatorTextStyle` for Material 3 Time Picker (flutter/flutter#143739) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from efc69946cb1e to 9100d326475a (2 revisions) (flutter/flutter#143820) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 700250436e3f to efc69946cb1e (2 revisions) (flutter/flutter#143816) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from 3557277c575c to 700250436e3f (1 revision) (flutter/flutter#143814) 2024-02-21 jonahwilliams@google.com more fixes to unstable impeller goldens. (flutter/flutter#143811) 2024-02-21 engine-flutter-autoroll@skia.org Roll Flutter Engine from cb12a8cc97a1 to 3557277c575c (2 revisions) (flutter/flutter#143807) 2024-02-21 kevmoo@users.noreply.github.com [flutter_tools] enable wasm compile on beta channel (flutter/flutter#143779) 2024-02-21 simonfv@gmail.com Fix initialization of time in repeat on AnimationController (flutter/flutter#142887) 2024-02-21 jonahwilliams@google.com Disable debug banner to stabilize impeller goldens. (flutter/flutter#143794) 2024-02-21 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Changing `TextPainter.getOffsetForCaret` implementation to remove the logarithmic search (#143281)" (flutter/flutter#143801) 2024-02-20 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Add UI Benchmarks (#143542)" (flutter/flutter#143798) 2024-02-20 31859944+LongCatIsLooong@users.noreply.github.com Avoid applying partial dartfixes on CI (flutter/flutter#143551) 2024-02-20 bernaferrari2@gmail.com Add UI Benchmarks (flutter/flutter#143542) 2024-02-20 engine-flutter-autoroll@skia.org Roll Flutter Engine from 1ae2c10e8071 to cb12a8cc97a1 (1 revision) (flutter/flutter#143791) 2024-02-20 nate.w5687@gmail.com Implement `_suspendedNode` fix (flutter/flutter#143556) 2024-02-20 xubaolin@oppo.com Change `ItemExtentBuilder`'s return value nullable (flutter/flutter#142428) 2024-02-20 engine-flutter-autoroll@skia.org Roll Flutter Engine from 27828054f07a to 1ae2c10e8071 (6 revisions) (flutter/flutter#143783) 2024-02-20 engine-flutter-autoroll@skia.org Roll Flutter Engine from e16a260265ad to 27828054f07a (1 revision) (flutter/flutter#143769) 2024-02-20 jonahwilliams@google.com [gold] Always provide host ABI to gold config (flutter/flutter#143621) 2024-02-20 andrewrkolos@gmail.com instead of exiting the tool, print a warning when using --flavor with an incompatible device (flutter/flutter#143735) 2024-02-20 nate.w5687@gmail.com Implementing `switch` expressions: everything in `flutter/lib/src/` (flutter/flutter#143634) 2024-02-20 31859944+LongCatIsLooong@users.noreply.github.com Changing `TextPainter.getOffsetForCaret` implementation to remove the logarithmic search (flutter/flutter#143281) 2024-02-20 34871572+gmackall@users.noreply.github.com Delete local.properties that shouldn't have been pushed (flutter/flutter#143774) 2024-02-20 polinach@google.com Clean leaks. (flutter/flutter#142818) 2024-02-20 36861262+QuncCccccc@users.noreply.github.com Introduce tone-based surfaces and accent color add-ons - Part 2 (flutter/flutter#138521) 2024-02-20 greg@zulip.com Explain when and why to use CrossAxisAlignment.baseline (flutter/flutter#143632) 2024-02-20 engine-flutter-autoroll@skia.org Roll Flutter Engine from a41da3701923 to e16a260265ad (2 revisions) (flutter/flutter#143763) ...

This pull request is step 12 in the journey to make this entire repository more readable. (previous PRs: #139048, #139882, #141591, #142279, #142634, #142793, #143293, #143496, #143634, #143812, #144580) We're getting close to the end! ð��

…/src/` (flutter/flutter#143634)

nate-thegrate added 2 commits February 16, 2024 23:27

refactor performLayout()

0b5eb1e

so many switch expressions

9d84cb6

nate-thegrate added 10 commits February 17, 2024 00:33

fix variable syntax

c61c880

was missing a comma 😑

5809f66

remove unused variable

b941524

move the // ignore comment to a better spot

1d11356

revert some scrolling changes

75123f4

re-implement some scroll changes

d8e5a7d

re-implement scrollable.dart

b3698d5

re-implement scrollable_helpers.dart

c6a0003

re-implement *some* SingleChildScrollView changes

9ea128a

fix SingleChildScrollView problem

fbccf06

nate-thegrate marked this pull request as ready for review February 17, 2024 20:49

nate-thegrate added 2 commits February 18, 2024 16:08

DRY switch statements

941a800

revert changes to lib/src/rendering/

871b053

revert non-switch-expression changes

e91c5a8

bernaferrari reviewed Feb 19, 2024

View reviewed changes

=> for inline methods

ea2e2e4

goderbauer reviewed Feb 20, 2024

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relocate comments

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loic-sharma reviewed Feb 20, 2024

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packages/flutter/lib/src/services/raw_keyboard_fuchsia.dart Outdated Show resolved Hide resolved

Apply suggestions from code review

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Co-authored-by: Loïc Sharma <737941+loic-sharma@users.noreply.github.com>

loic-sharma reviewed Feb 20, 2024

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loic-sharma approved these changes Feb 20, 2024

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make switch expressions a bit less funky

ebd16a1

loic-sharma added the autosubmit Merge PR when tree becomes green via auto submit App label Feb 20, 2024

auto-submit bot merged commit 7a4c246 into flutter:master Feb 20, 2024

nate-thegrate deleted the switch-expressions-9 branch February 20, 2024 21:07

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Implementing null-aware operators throughout the repository #143804

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Implementing switch expressions in flutter_tools/ #145632

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7a4c246 Implementing switch expressions: everything in `flutter/lib…

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nate-thegrate added the refactor Improving readability/efficiency without behavioral changes label Jul 12, 2024

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Style Guide updates #152525

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	AxisDirection.right => Offset( position.pixels, 0),
	AxisDirection.right => Offset(position.pixels, 0),

Implementing switch expressions: everything in flutter/lib/src/ #143634

Implementing switch expressions: everything in flutter/lib/src/ #143634

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Implementing `switch` expressions: everything in `flutter/lib/src/` #143634

Implementing `switch` expressions: everything in `flutter/lib/src/` #143634

nate-thegrate commented Feb 17, 2024 •

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