introduce system color palette #163335

yjbanov · 2025-02-14T19:37:21Z

Introduce system colors:

Add new SystemColor class.
Add PlatformDispatcher.systemColors getter.

The web engine part for #118853

chunhtai

some fly-by comment

chunhtai · 2025-02-14T19:41:19Z

engine/src/flutter/lib/ui/platform_dispatcher.dart

+  /// See also:
+  ///
+  ///   * https://drafts.csswg.org/css-color/#css-system-colors
+  static const List<String> systemColorNames = <String>[


a set maybe more concise

also is the name here a union between the possible choice between web and windows?

The names are W3C standard names, so they are cross-platform. I think it makes sense for us to just adopt the W3C naming, because that will let us cover all platforms, and we won't need to invent our own standard.

nvm, I misread some of the doc, I thought we may have this feature in native windows as well

We might want to add it for Windows. I just didn't add it in this PR,.

wait does native windows also have this feature? are you talking about this one? https://support.microsoft.com/en-us/windows/personalize-your-colors-in-windows-3290d30f-d064-5cfe-6470-2fe9c6533e37

Is it that these setting will somehow translate to <system-color> when user user the browser?

I can only confirm that the "contrast themes" settings affect system color settings. Changing "accent color" doesn't seem to do anything.

chunhtai · 2025-02-14T19:44:32Z

engine/src/flutter/lib/ui/platform_dispatcher.dart

+  /// As of the current release, system colors are supported on web only.
+  ///
+  /// This is typically used in conjunction with
+  /// [AccessibilityFeatures.highContrast]. In particular, on Windows, when


this is for weindows web right?

This is supported by all browsers on all operating systems. For example, I can get a list of system colors in Safari on macOS (in fact, you will notice that the test I added runs in all browsers on all operating systems).

but is the windows web the only platform that user can set it without doing manually modifying the css?

Correct. System colors is a general feature of being able to match your UI colors with system colors (https://blog.jim-nielsen.com/2021/css-system-colors/). However, on Windows the user can customize those colors.

kevmoo · 2025-02-14T22:03:50Z

Might could at least add a reference to related bug?

yjbanov · 2025-02-14T22:24:35Z

@kevmoo

Might could at least add a reference to related bug?

Done.

kevmoo · 2025-02-14T22:27:15Z

engine/src/flutter/lib/ui/platform_dispatcher.dart

+  /// See also:
+  ///
+  ///   * https://drafts.csswg.org/css-color/#css-system-colors
+  static const List<String> systemColorNames = <String>[


I always have a weird feeling these types of things should be Set just...on principle. But I know it just generates slightly slower code w/ no benefit. 🤷

I'm actually starting to reconsider this list. Since the names are known and defined in the specification, I wonder if we should just make it an "enum" of sorts (it can't be literally enum because we detect their data dynamically).

(it can't be literally enum because we detect their data dynamically).

Can you elaborate? I also prefer enum as the dart:ui API

Enums need to be const, but SystemColor.value is computed by reading it dynamically from the browser. However, we can make it an almost-enum, similar to SemanticsAction.

flutter-dashboard · 2025-02-14T23:34:15Z

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Changes reported for pull request #163335 at sha 93c0a95

QuncCccccc · 2025-02-15T03:13:27Z

engine/src/flutter/lib/ui/platform_dispatcher.dart

+  ///   * https://drafts.csswg.org/css-color/#css-system-colors
+  ///   * https://developer.mozilla.org/en-US/docs/Web/CSS/system-color
+  ///   * https://developer.mozilla.org/en-US/docs/Web/CSS/@media/forced-colors
+  Map<String, SystemColor>? get systemColors => null;


Thanks for adding the support on the engine side. I will think about how we integrate this with framework themes.

navaronbracke · 2025-02-15T13:14:11Z

engine/src/flutter/lib/ui/platform_dispatcher.dart

+  /// The color value used for the color named [name], if supported.
+  ///
+  /// If [isSupported] is false, the [value] is null. If [isSupported] is true,
+  /// tha [value] is not null.


Fly-by comment, this should be "the" ?

navaronbracke · 2025-02-15T13:14:43Z

engine/src/flutter/lib/ui/platform_dispatcher.dart

+  /// tha [value] is not null.
+  final Color? value;
+
+  /// Whether the current platform supports a color with the give [name].


Fly-by comment, this should be "the given [name]." ?

flutter-dashboard · 2025-02-18T23:55:23Z

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For more guidance, visit Writing a golden file test for package:flutter.

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

Changes reported for pull request #163335 at sha 8059814

QuncCccccc

LGTM😀!

chunhtai · 2025-02-19T23:40:59Z

engine/src/flutter/lib/ui/platform_dispatcher.dart

+  /// See also:
+  ///
+  ///   * https://drafts.csswg.org/css-color/#css-system-colors
+  static SystemColor get accentColor => throw _systemColorUnsupportedError();


This seems slightly dangerous that it throw for non web platform. Should we make it nullable?

The idea is that framework-side code would check platformProvidesSystemColors before accessing any of the colors. Alternatively, we could always return a SystemColor, but SystemColor.isSupported would return false.

chunhtai · 2025-02-19T23:43:33Z

engine/src/flutter/lib/web_ui/lib/src/engine/high_contrast.dart

+];
+
+class SystemColorPaletteDetector {
+  SystemColorPaletteDetector() {


Do we have logic to reload these when system color override changes?

No, but see my comment above. I don't know how to do it, but it also may not be important.

chunhtai · 2025-02-19T23:45:32Z

engine/src/flutter/lib/web_ui/lib/platform_dispatcher.dart

  double scaleFontSize(double unscaledFontSize);
 }

+final class SystemColor {


Same thing here, do we or should we have mechanism to get notification when system color change during the life time of an app?

I'm not yet sure how to implement it. The only signal I can listen to is the forced-colors media query, but that doesn't notify about individual color changes, only about the high contrast switch overall. I think it might be fine for now though. I expect users will create a theme once, and then turn the high contrast mode on and off, which already send a notification.

chunhtai · 2025-02-19T23:46:01Z

overall looks good, just left some questions

chunhtai

LGTM

Manual roll Flutter from 39b4951 to 911aa75 (56 revisions) Manual roll requested by stuartmorgan@google.com flutter/flutter@39b4951...911aa75 2025-02-21 bdero@google.com Remove legacy scenec stuff from flutter_tool (flutter/flutter#163569) 2025-02-21 68449066+zijiehe-google-com@users.noreply.github.com [fuchsia] reorder tests in test_suites.yaml and update the comment (flutter/flutter#163799) 2025-02-21 engine-flutter-autoroll@skia.org Roll Dart SDK from 7ceb3be8ed0a to c5e582f15b6c (2 revisions) (flutter/flutter#163844) 2025-02-21 engine-flutter-autoroll@skia.org Roll Packages from a9b9172 to 5a721da (2 revisions) (flutter/flutter#163848) 2025-02-21 engine-flutter-autoroll@skia.org Roll Dart SDK from ad642ee6f94b to 7ceb3be8ed0a (2 revisions) (flutter/flutter#163832) 2025-02-21 matanlurey@users.noreply.github.com Update how to use VSCode with `clangd` after the monorepo merge (flutter/flutter#163671) 2025-02-21 matanlurey@users.noreply.github.com Reland #163711 after #163780 (flutter/flutter#163812) 2025-02-21 robert.ancell@canonical.com Fix incorrect function name in FlutterEngineRun documentation (flutter/flutter#163696) 2025-02-21 engine-flutter-autoroll@skia.org Roll Dart SDK from 557cbf2c7da6 to ad642ee6f94b (5 revisions) (flutter/flutter#163794) 2025-02-21 1961493+harryterkelsen@users.noreply.github.com [canvaskit] Use `visualViewport.scale` to determine device pixel ratio. (flutter/flutter#163688) 2025-02-21 flar@google.com [DisplayList] Migrate rendering tests and benchmarks to DL geometry (flutter/flutter#163766) 2025-02-21 matanlurey@users.noreply.github.com Make `releaseMode` explicit, inform `determineDevDependencies` entirely on the flag (flutter/flutter#163780) 2025-02-21 matanlurey@users.noreply.github.com Ensure `exclude_dev_dependencies_test` runs if `flutter_tools` changes. (flutter/flutter#163768) 2025-02-21 nabilamevia2003@gmail.com WebKit should respect TextCapitalization.words (flutter/flutter#161027) 2025-02-21 victorsanniay@gmail.com CupertinoSliverNavigationBar.search fidelity updates (flutter/flutter#163089) 2025-02-21 65627237+lucas-goldner@users.noreply.github.com feat: Add selectionColor property to selectable text (flutter/flutter#162177) 2025-02-20 matanlurey@users.noreply.github.com Restore `linux_android_emulator_tests` to CI. (flutter/flutter#163747) 2025-02-20 yjbanov@google.com introduce system color palette (flutter/flutter#163335) 2025-02-20 kevmoo@users.noreply.github.com [web] DRY up access to headers required for multi-threaded WebAssembly (flutter/flutter#163555) 2025-02-20 stanleycocoa@gmail.com fix(CupertinoDatePicker): font is inconsistent (flutter/flutter#162932) 2025-02-20 reidbaker@google.com Create Android-API-And-Related-Versions.md (flutter/flutter#163556) 2025-02-20 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Avoid implicitly setting `determineDevDependencies: true` (it's not a safe operation) (#163711)" (flutter/flutter#163762) 2025-02-20 56849473+mariamhas@users.noreply.github.com Revert "Create g3_bug.yml" (flutter/flutter#163757) 2025-02-20 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Make Flutter version information accessible at runtime (#140783)" (flutter/flutter#163753) 2025-02-20 magder@google.com Skip Xcode install on mac_mokey Android tests (flutter/flutter#163685) 2025-02-20 engine-flutter-autoroll@skia.org Roll Dart SDK from 2cecb16348e4 to 557cbf2c7da6 (3 revisions) (flutter/flutter#163705) 2025-02-20 matanlurey@users.noreply.github.com Add `FlutterVersion.engineCommitDate`, helps signal engine artifact SHA issues (flutter/flutter#163652) 2025-02-20 matanlurey@users.noreply.github.com Avoid implicitly setting `determineDevDependencies: true` (it's not a safe operation) (flutter/flutter#163711) 2025-02-20 matanlurey@users.noreply.github.com It is now safe to call `getBuildMode().release` (flutter/flutter#163712) 2025-02-20 jonahwilliams@google.com [iOS] remove Skia interfaces from iOS platform code. (flutter/flutter#163505) 2025-02-20 ueman@users.noreply.github.com Make Flutter version information accessible at runtime (flutter/flutter#140783) 2025-02-20 matej.knopp@gmail.com [windows] Implement merged UI and platform thread (flutter/flutter#162935) 2025-02-20 31642846+dbspoudel@users.noreply.github.com `CircularProgressIndicator` throws null exception (flutter/flutter#163356) 2025-02-20 ybz975218925@gmail.com Fix the issue where DropdownMenu does not gain focus when tapped. (flutter/flutter#162874) 2025-02-20 codefu@google.com Check for tracked engine.version before overriding (flutter/flutter#163672) 2025-02-20 ybz975218925@gmail.com showDialogs adds a `requestFocus` parameter. (flutter/flutter#162928) 2025-02-20 polinach@google.com Create helper method to dispatch object creation and disposal. (flutter/flutter#163637) 2025-02-20 15619084+vashworth@users.noreply.github.com Redistribute iOS TESTOWNERS (flutter/flutter#163653) 2025-02-20 31859944+LongCatIsLooong@users.noreply.github.com enclosingElement -> enclosingElement3 (flutter/flutter#163681) 2025-02-19 bkonyi@google.com [ Widget Preview ] Move `preview_detector_test.dart` from `general.shard` to `commands.shard` (flutter/flutter#163619) 2025-02-19 jonahwilliams@google.com [iOS] always post new task during gesture dispatch. (flutter/flutter#163646) 2025-02-19 biggs0125@gmail.com Allow flutter tools to detach a running Chrome session (flutter/flutter#163349) 2025-02-19 flar@google.com Reland "[Impeller] add support for rational bezier conics to Path (#63282)" (flutter/flutter#163645) 2025-02-19 yjbanov@google.com [web:a11y] wheel events switch to pointer mode (flutter/flutter#163582) ...

Part of #118853 This PR is an enhancement to #163335 to provide detection of system colors for both light and dark mode. This is needed for the construction of a [`highContrastTheme`](https://api.flutter.dev/flutter/material/MaterialApp/highContrastTheme.html) and [`highContrastDarkTheme`](https://api.flutter.dev/flutter/material/MaterialApp/highContrastDarkTheme.html).

) Manual roll Flutter from 39b4951 to 911aa75 (56 revisions) Manual roll requested by stuartmorgan@google.com flutter/flutter@39b4951...911aa75 2025-02-21 bdero@google.com Remove legacy scenec stuff from flutter_tool (flutter/flutter#163569) 2025-02-21 68449066+zijiehe-google-com@users.noreply.github.com [fuchsia] reorder tests in test_suites.yaml and update the comment (flutter/flutter#163799) 2025-02-21 engine-flutter-autoroll@skia.org Roll Dart SDK from 7ceb3be8ed0a to c5e582f15b6c (2 revisions) (flutter/flutter#163844) 2025-02-21 engine-flutter-autoroll@skia.org Roll Packages from a9b9172 to 5a721da (2 revisions) (flutter/flutter#163848) 2025-02-21 engine-flutter-autoroll@skia.org Roll Dart SDK from ad642ee6f94b to 7ceb3be8ed0a (2 revisions) (flutter/flutter#163832) 2025-02-21 matanlurey@users.noreply.github.com Update how to use VSCode with `clangd` after the monorepo merge (flutter/flutter#163671) 2025-02-21 matanlurey@users.noreply.github.com Reland #163711 after #163780 (flutter/flutter#163812) 2025-02-21 robert.ancell@canonical.com Fix incorrect function name in FlutterEngineRun documentation (flutter/flutter#163696) 2025-02-21 engine-flutter-autoroll@skia.org Roll Dart SDK from 557cbf2c7da6 to ad642ee6f94b (5 revisions) (flutter/flutter#163794) 2025-02-21 1961493+harryterkelsen@users.noreply.github.com [canvaskit] Use `visualViewport.scale` to determine device pixel ratio. (flutter/flutter#163688) 2025-02-21 flar@google.com [DisplayList] Migrate rendering tests and benchmarks to DL geometry (flutter/flutter#163766) 2025-02-21 matanlurey@users.noreply.github.com Make `releaseMode` explicit, inform `determineDevDependencies` entirely on the flag (flutter/flutter#163780) 2025-02-21 matanlurey@users.noreply.github.com Ensure `exclude_dev_dependencies_test` runs if `flutter_tools` changes. (flutter/flutter#163768) 2025-02-21 nabilamevia2003@gmail.com WebKit should respect TextCapitalization.words (flutter/flutter#161027) 2025-02-21 victorsanniay@gmail.com CupertinoSliverNavigationBar.search fidelity updates (flutter/flutter#163089) 2025-02-21 65627237+lucas-goldner@users.noreply.github.com feat: Add selectionColor property to selectable text (flutter/flutter#162177) 2025-02-20 matanlurey@users.noreply.github.com Restore `linux_android_emulator_tests` to CI. (flutter/flutter#163747) 2025-02-20 yjbanov@google.com introduce system color palette (flutter/flutter#163335) 2025-02-20 kevmoo@users.noreply.github.com [web] DRY up access to headers required for multi-threaded WebAssembly (flutter/flutter#163555) 2025-02-20 stanleycocoa@gmail.com fix(CupertinoDatePicker): font is inconsistent (flutter/flutter#162932) 2025-02-20 reidbaker@google.com Create Android-API-And-Related-Versions.md (flutter/flutter#163556) 2025-02-20 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Avoid implicitly setting `determineDevDependencies: true` (it's not a safe operation) (#163711)" (flutter/flutter#163762) 2025-02-20 56849473+mariamhas@users.noreply.github.com Revert "Create g3_bug.yml" (flutter/flutter#163757) 2025-02-20 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Make Flutter version information accessible at runtime (#140783)" (flutter/flutter#163753) 2025-02-20 magder@google.com Skip Xcode install on mac_mokey Android tests (flutter/flutter#163685) 2025-02-20 engine-flutter-autoroll@skia.org Roll Dart SDK from 2cecb16348e4 to 557cbf2c7da6 (3 revisions) (flutter/flutter#163705) 2025-02-20 matanlurey@users.noreply.github.com Add `FlutterVersion.engineCommitDate`, helps signal engine artifact SHA issues (flutter/flutter#163652) 2025-02-20 matanlurey@users.noreply.github.com Avoid implicitly setting `determineDevDependencies: true` (it's not a safe operation) (flutter/flutter#163711) 2025-02-20 matanlurey@users.noreply.github.com It is now safe to call `getBuildMode().release` (flutter/flutter#163712) 2025-02-20 jonahwilliams@google.com [iOS] remove Skia interfaces from iOS platform code. (flutter/flutter#163505) 2025-02-20 ueman@users.noreply.github.com Make Flutter version information accessible at runtime (flutter/flutter#140783) 2025-02-20 matej.knopp@gmail.com [windows] Implement merged UI and platform thread (flutter/flutter#162935) 2025-02-20 31642846+dbspoudel@users.noreply.github.com `CircularProgressIndicator` throws null exception (flutter/flutter#163356) 2025-02-20 ybz975218925@gmail.com Fix the issue where DropdownMenu does not gain focus when tapped. (flutter/flutter#162874) 2025-02-20 codefu@google.com Check for tracked engine.version before overriding (flutter/flutter#163672) 2025-02-20 ybz975218925@gmail.com showDialogs adds a `requestFocus` parameter. (flutter/flutter#162928) 2025-02-20 polinach@google.com Create helper method to dispatch object creation and disposal. (flutter/flutter#163637) 2025-02-20 15619084+vashworth@users.noreply.github.com Redistribute iOS TESTOWNERS (flutter/flutter#163653) 2025-02-20 31859944+LongCatIsLooong@users.noreply.github.com enclosingElement -> enclosingElement3 (flutter/flutter#163681) 2025-02-19 bkonyi@google.com [ Widget Preview ] Move `preview_detector_test.dart` from `general.shard` to `commands.shard` (flutter/flutter#163619) 2025-02-19 jonahwilliams@google.com [iOS] always post new task during gesture dispatch. (flutter/flutter#163646) 2025-02-19 biggs0125@gmail.com Allow flutter tools to detach a running Chrome session (flutter/flutter#163349) 2025-02-19 flar@google.com Reland "[Impeller] add support for rational bezier conics to Path (#63282)" (flutter/flutter#163645) 2025-02-19 yjbanov@google.com [web:a11y] wheel events switch to pointer mode (flutter/flutter#163582) ...

Part of flutter#118853 This PR is an enhancement to flutter#163335 to provide detection of system colors for both light and dark mode. This is needed for the construction of a [`highContrastTheme`](https://api.flutter.dev/flutter/material/MaterialApp/highContrastTheme.html) and [`highContrastDarkTheme`](https://api.flutter.dev/flutter/material/MaterialApp/highContrastDarkTheme.html).

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[web] Support forced-colors feature #118853

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introduce system color palette

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update licenses_flutter

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remove hostDetector when done detecting

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use getters to make API identical

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9b356c1 introduce system color palette (flutter/flutter#163335)

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engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request May 20, 2025

9b356c1 introduce system color palette (flutter/flutter#163335)

bb9a070

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request May 21, 2025

9b356c1 introduce system color palette (flutter/flutter#163335)

fac542e

introduce system color palette #163335

introduce system color palette #163335

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yjbanov commented Feb 14, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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yjbanov Feb 14, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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chunhtai commented Feb 19, 2025

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yjbanov commented Feb 14, 2025 •

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