- Add support for "reduce motion" into AccessibilityInfo (#23839)
Summary:
This PR adds `isReduceMotionEnabled()` to `AccessibilityInfo` in other to add support for "reduce motion", exposing the Operational System's settings option. Additionally, it adds a new event, `reduceMotionChanged`, in order to listen for this flag's update.
With this feature, developers will be able to disable or reduce animations, _**something that will be required as soon as WCAG 2.1 draft got approved**._ See [WCAG 2.1 — 2.3.3 Animations from Interaction criteria](https://knowbility.org/blog/2018/WCAG21-233Animations/)
It's exposed by [`UIAccessibility`' isReduceMotionEnabled ](https://developer.apple.com/documentation/uikit/uiaccessibility/1615133-isreducemotionenabled
) on iOS and [Settings.Global.TRANSITION_ANIMATION_SCALE](https://developer.android.com/reference/android/provider/Settings.Global#TRANSITION_ANIMATION_SCALE) on Android.
Up until now, `AccessibilityInfo` only exposes screen reader flag. By adding this second accessibility option, it's a good opportunity to rename `fetch` method to an appropriate name, `isScreenReaderEnabled`, as well as rename `change` event to `screenReaderChanged`, which will make it clearer and more specific.
(In case it's approved, a follow-up PR could exposes [more iOS acessibility flags](https://developer.apple.com/documentation/uikit/uiaccessibility), such as `isShakeToUndoEnabled`, `isReduceTransparencyEnabled`, `isGrayscaleEnabled`, `isInvertColorsEnabled`)
(iOS code inspired by [phonegap-mobile-accessibility](https://github.com/phonegap/phonegap-mobile-accessibility). And Android by [Flutter](https://github.com/flutter/engine/blob/master/shell/platform/android/io/flutter/view/AccessibilityBridge.java
))
Pull Request resolved: https://github.com/facebook/react-native/pull/23839
Differential Revision: D14406227
Pulled By: hramos
fbshipit-source-id: adf43be84c488522bf1e29d862681220ad193883
0090ab32c2