Files
react-native/React
Paige SunandFacebook GitHub Bot c032401b67 Fix sticky headers for scrollviews by sending onScroll event to legacy RCTEventDispatcher
Summary:
Changelog: [Internal][Bridgeless] Fix sticky headers for scrollviews by sending onScroll event to legacy RCTEventDispatcher

## Extra Context

FYI. <ScrollView> is the only Fabric component view that needs to send events via the legacy RCTEventDispatcher. Ideally, all component views should only use `ViewEventEmitter` to send events to JS and not use RCTEventDispatcher. This ScrollView does use ScrollViewEventEmitter, a subclass of ViewEventEmitter:
```
std::static_pointer_cast<ScrollViewEventEmitter const>(_eventEmitter)->onScroll([self _scrollViewMetrics]);
```

However, it also needs RCTEventDispatcher for animations using `Animated.event` for `useNativeDriver: true`. See [ScrollView.js](https://github.com/facebook/react-native/blob/370c65b94379a72e74f5dfd5b6202f282841a950/Libraries/Components/ScrollView/ScrollView.js#L1124-L1129).

Reviewed By: RSNara

Differential Revision: D35540277

fbshipit-source-id: a28535ed10cac8e003523ecda6080574fbb89b85
2022-04-11 15:30:14 -07:00
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