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`prefers-contrast`, `prefers-reduced-transparency` and `inverted-colors` are never measured, though `AccessibilityInfo` reports each

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#514 0 bình luận 0 reaction 0 người được giao Xem trên GitHub

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Đánh giá

Độ khó
3/5
Thời gian dự kiến
1-2 ngày
Mức phù hợp với người mới
68/100
Loại issue
Lỗi
Độ rõ ràng
Đặc tả rõ ràng
Mức độ hoạt động
Sôi nổi
Công nghệ
react-native, typescript
Lĩnh vực
accessibility, frontend

Hướng nghiên cứu

Start with src/native/conditions/media-query.ts and the reduced motion handling referenced by issue #388. Check how AccessibilityInfo exposes the three preference values and change events, then add focused tests alongside the reported reproducer at src/__tests__/native/accessibility-preferences.test.tsx. Done means the three media features match their enabled values and respond to preference changes.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.

Mô tả

Before submitting a new issue
  • I tested using the latest version of the library, as the bug might be already fixed.
  • I tested using a supported version of react native.
  • I checked for possible duplicate issues, with possible answers.
Bug summary

The media evaluator answers prefers-color-scheme, and with #388 prefers-reduced-motion, but no other user preference, though React Native 0.86's AccessibilityInfo reports three more, each with a change event:

  • prefers-contrast: more: isDarkerSystemColorsEnabled() on iOS (Increase Contrast) and isHighTextContrastEnabled() on Android;
  • prefers-reduced-transparency: reduce: isReduceTransparencyEnabled() on iOS, which Android resolves false;
  • inverted-colors: inverted: isInvertColorsEnabled() on both.

getMediaFeatureValue (src/native/conditions/media-query.ts) has no arm for them, so (prefers-contrast: more) never matches for someone who turned contrast up, and not (prefers-contrast: more) matches for everyone. With no preference set, Chromium 156, Firefox 157 and WebKit 27.2 answer prefers-contrast with no-preference; Chromium alone also answers prefers-reduced-transparency, and WebKit alone inverted-colors.

condition the engines that answer it main (2421ea7) #426 (40bfda2)
(prefers-contrast: no-preference) match (all three) no match no match
not (prefers-contrast: more) match (all three) match no match
(prefers-reduced-transparency: no-preference) match (Chromium) no match no match
(inverted-colors: none) match (WebKit) no match no match

#426 answers an unmeasured feature unknown (MQ5 §3.1), so there not (prefers-contrast: more) stops matching too, and lists these three among its known limits. Each can follow #388, which reads isReduceMotionEnabled() and reduceMotionChanged.

Library version

main at 2421ea7 (0.0.0-nightly.2421ea7)

Environment info
System:
  OS: Windows 11 10.0.26300
  CPU: "(32) x64 AMD Ryzen 9 9950X3D 16-Core Processor          "
  Memory: 155.26 GB / 255.67 GB
Binaries:
  Node:
    version: 26.12.1
    path: C:\Program Files\nodejs\node.EXE
  Yarn:
    version: 4.9.2
    path: C:\Users\<user>\AppData\Roaming\npm\yarn.CMD
  npm:
    version: 12.2.1
    path: C:\Program Files\nodejs\npm.CMD
  Watchman: Not Found
SDKs:
  Android SDK:
    API Levels:
      - "33"
      - "35"
      - "35"
      - "35"
      - "36"
      - "37"
    Build Tools:
      - 35.0.0
      - 36.0.0
      - 36.1.0
      - 37.0.0
    System Images:
      - android-26 | Google APIs Intel x86_64 Atom
      - android-28 | Google APIs Intel x86_64 Atom
      - android-29 | Google APIs Intel x86_64 Atom
      - android-30 | Google APIs Intel x86_64 Atom
      - android-31 | Google APIs Intel x86_64 Atom
      - android-32 | Google APIs Intel x86_64 Atom
      - android-33 | Google APIs Intel x86_64 Atom
      - android-34 | Google APIs Intel x86_64 Atom
      - android-35 | Google APIs Intel x86_64 Atom
      - android-36.1 | Google Play Intel x86_64 Atom
      - android-36.1 | Pre-Release 16 KB Page Size Google Play Intel x86_64 Atom
      - android-37.0 | Google APIs Intel x86_64 Atom
    Android NDK: Not Found
  Windows SDK: Not Found
IDEs:
  Android Studio: AI-262.9437.185.2621.16467767
  Visual Studio: Not Found
Languages:
  Java:
    version: 17.0.20.1
    path: C:\Program Files\Microsoft\jdk-17.0.20.101-hotspot\bin\javac.EXE
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 19.2.3
    wanted: 19.2.3
  react-native:
    installed: 0.86.3
    wanted: 0.86.3
  react-native-windows: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found
Steps to reproduce
  1. Clone the reproducer branch, which is main at 2421ea7 with one file added, src/__tests__/native/accessibility-preferences.test.tsx, and install: 
    git clone --branch repro/514-accessibility-preferences-unmeasured https://github.com/YevheniiKotyrlo/react-native-css
cd react-native-css
yarn install
  2. Run yarn jest src/__tests__/native/accessibility-preferences.test.tsx.

src/__tests__/native/accessibility-preferences.test.tsx:

// With no accessibility preference set, Chromium, Firefox and WebKit answer prefers-contrast no-preference, and WebKit inverted-colors none
import { render, screen } from "@testing-library/react-native";
import { View } from "react-native-css/components/View";
import { registerCSS } from "react-native-css/jest";

test.each([
  ["(prefers-contrast: no-preference)", true],
  ["not (prefers-contrast: more)", true],
  ["(prefers-reduced-transparency: no-preference)", true],
  ["(inverted-colors: none)", true],
])("with no preference set, @media %s matches: %s", (condition, expected) => {
  registerCSS(`
    .child { width: 10px; }
    @media ${condition} { .child { width: 37px; } }
  `);
  render(<View testID="child" className="child" />);
  expect(screen.getByTestId("child").props.style.width === 37).toBe(expected);
});

Expected: (prefers-contrast: more), (prefers-reduced-transparency: reduce) and (inverted-colors: inverted) match while AccessibilityInfo reports the setting on, and follow its change events.

Actual: none of them ever matches.

The run's output on main at 2421ea7, Windows 11, Node 26.12.1 
FAIL src/__tests__/native/accessibility-preferences.test.tsx
  × with no preference set, @media (prefers-contrast: no-preference) matches: true (20 ms)
  √ with no preference set, @media not (prefers-contrast: more) matches: true (6 ms)
  × with no preference set, @media (prefers-reduced-transparency: no-preference) matches: true (2 ms)
  × with no preference set, @media (inverted-colors: none) matches: true (1 ms)
  ● with no preference set, @media (prefers-contrast: no-preference) matches: true
    expect(received).toBe(expected) // Object.is equality
    Expected: true
    Received: false
      15 |   `);
      16 |   render(<View testID="child" className="child" />);
    > 17 |   expect(screen.getByTestId("child").props.style.width === 37).toBe(expected);
         |                                                                ^
      18 | });
      19 |
      at toBe (src/__tests__/native/accessibility-preferences.test.tsx:17:64)
  ● with no preference set, @media (prefers-reduced-transparency: no-preference) matches: true
    expect(received).toBe(expected) // Object.is equality
    Expected: true
    Received: false
      15 |   `);
      16 |   render(<View testID="child" className="child" />);
    > 17 |   expect(screen.getByTestId("child").props.style.width === 37).toBe(expected);
         |                                                                ^
      18 | });
      19 |
      at toBe (src/__tests__/native/accessibility-preferences.test.tsx:17:64)
  ● with no preference set, @media (inverted-colors: none) matches: true
    expect(received).toBe(expected) // Object.is equality
    Expected: true
    Received: false
      15 |   `);
      16 |   render(<View testID="child" className="child" />);
    > 17 |   expect(screen.getByTestId("child").props.style.width === 37).toBe(expected);
         |                                                                ^
      18 | });
      19 |
      at toBe (src/__tests__/native/accessibility-preferences.test.tsx:17:64)
Test Suites: 1 failed, 1 total
Tests:       3 failed, 1 passed, 4 total
Snapshots:   0 total
Time:        1.086 s, estimated 2 s
Ran all test suites matching /src\\__tests__\\native\\accessibility-preferences.test.tsx/i.
Reproducible example repository

https://github.com/YevheniiKotyrlo/react-native-css/tree/repro/514-accessibility-preferences-unmeasured

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TypeScript
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