Expose the reduced-motion preference beside colorScheme
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还没有人认领这个 Issue。
评估
- 难度
- 5/5
- 预计耗时
- 一周以上
- 新手友好度
- 25/100
- Issue 类型
- 功能
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 技术栈
- react-native, typescript
调研方向
Read the reduced-motion implementation proposed in #388 and compare it with the existing colorScheme API and devicePreference() behavior. Check the React Native and web paths, including matchMedia and the jest helper, then determine whether the public setter or a jest-only setter is desired. Done means the API shape and override behavior are agreed before implementation.
由索引模型根据 Issue 内容生成。
描述
#388 makes native evaluate prefers-reduced-motion, reading the device's setting from AccessibilityInfo. A consumer then needs two things:
- An app with its own "Reduce motion" setting has to override the device's preference, and keep its choice when the device's setting changes.
- A test suite has to put a test in reduce mode:
react-native-css/jestresets the preference before each test, and nothing public sets it.
#388 adds reducedMotion to the API, beside colorScheme:
import { reducedMotion } from "react-native-css";
reducedMotion.get(); // "reduce", "no-preference", or undefined until the device answers
reducedMotion.set("reduce"); // overrides the device, through any change of its setting
reducedMotion.set(null); // follows the device again
The override holds until it is cleared, as Appearance.setColorScheme(), iOS's overrideUserInterfaceStyle and Android's setDefaultNightMode() hold theirs, and as Media Queries 5 §13 shapes the web's navigator.preferences.reducedMotion.requestOverride() and clearOverride(). Internally it is one devicePreference() that keeps the device's answer apart from the app's override, which a later preference the platform reports but does not let an app set, such as contrast or reduced transparency, can share. On main, colorScheme.set() writes a value the next change of the device's scheme replaces; #415 keeps the scheme's override in Appearance, which holds it on the platform itself.
On web the browser evaluates @media in the stylesheet itself, so get() reads matchMedia and set() changes only what get() returns, not the CSS or matchMedia(). navigator.preferences would carry the override into the CSS, but no browser ships it yet (csswg-drafts#14493); once one does, the web set() can call it.
Is this the shape you would want, or would you rather keep the setter in the jest helper only?
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