From 487d871cfd89948f4db9944c4bb414d268a56537 Mon Sep 17 00:00:00 2001
From: dan <dan.abramov@gmail.com>
Date: Thu, 9 Nov 2023 23:47:54 +0000
Subject: [PATCH] Pull useAnimatedScrollHandler back up (#1858)

* Revert "Pull animated scroll handler down from pager"

This reverts commit ecebb78e40148b9160f832d26ada1d366551b645.

* Only handle onScroll for current page
---
 src/view/com/pager/PagerWithHeader.tsx | 40 ++++++++++----------------
 src/view/screens/ProfileFeed.tsx       | 20 ++++---------
 src/view/screens/ProfileList.tsx       | 13 ++++-----
 3 files changed, 26 insertions(+), 47 deletions(-)

diff --git a/src/view/com/pager/PagerWithHeader.tsx b/src/view/com/pager/PagerWithHeader.tsx
index 701b5287..86139fb6 100644
--- a/src/view/com/pager/PagerWithHeader.tsx
+++ b/src/view/com/pager/PagerWithHeader.tsx
@@ -1,13 +1,9 @@
 import * as React from 'react'
-import {
-  LayoutChangeEvent,
-  NativeScrollEvent,
-  StyleSheet,
-  View,
-} from 'react-native'
+import {LayoutChangeEvent, StyleSheet, View} from 'react-native'
 import Animated, {
   Easing,
   useAnimatedReaction,
+  useAnimatedScrollHandler,
   useAnimatedStyle,
   useSharedValue,
   withTiming,
@@ -16,12 +12,13 @@ import Animated, {
 import {Pager, PagerRef, RenderTabBarFnProps} from 'view/com/pager/Pager'
 import {TabBar} from './TabBar'
 import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
+import {OnScrollCb} from 'lib/hooks/useOnMainScroll'
 
 const SCROLLED_DOWN_LIMIT = 200
 
 interface PagerWithHeaderChildParams {
   headerHeight: number
-  onScroll: (e: NativeScrollEvent) => void
+  onScroll: OnScrollCb
   isScrolledDown: boolean
 }
 
@@ -143,25 +140,12 @@ export const PagerWithHeader = React.forwardRef<PagerRef, PagerWithHeaderProps>(
       ],
     )
 
-    // Ideally we'd call useAnimatedScrollHandler here but we can't safely do that
-    // due to https://github.com/software-mansion/react-native-reanimated/issues/5345.
-    // So instead we pass down a worklet, and individual pages will have to call it.
-    const onScroll = React.useCallback(
-      (e: NativeScrollEvent) => {
-        'worklet'
+    // props to pass into children render functions
+    const onScroll = useAnimatedScrollHandler({
+      onScroll(e) {
         scrollY.value = e.contentOffset.y
       },
-      [scrollY],
-    )
-
-    // props to pass into children render functions
-    const childProps = React.useMemo<PagerWithHeaderChildParams>(() => {
-      return {
-        headerHeight,
-        onScroll,
-        isScrolledDown,
-      }
-    }, [headerHeight, onScroll, isScrolledDown])
+    })
 
     const onPageSelectedInner = React.useCallback(
       (index: number) => {
@@ -205,7 +189,11 @@ export const PagerWithHeader = React.forwardRef<PagerRef, PagerWithHeaderProps>(
               headerOnlyHeight > 0 &&
               tabBarHeight > 0
             ) {
-              output = child(childProps)
+              output = child({
+                headerHeight,
+                isScrolledDown,
+                onScroll: i === currentPage ? onScroll : noop,
+              })
             }
             // Pager children must be noncollapsible plain <View>s.
             return (
@@ -237,6 +225,8 @@ const styles = StyleSheet.create({
   },
 })
 
+function noop() {}
+
 function toArray<T>(v: T | T[]): T[] {
   if (Array.isArray(v)) {
     return v
diff --git a/src/view/screens/ProfileFeed.tsx b/src/view/screens/ProfileFeed.tsx
index 8a8851c9..9c3c6d7a 100644
--- a/src/view/screens/ProfileFeed.tsx
+++ b/src/view/screens/ProfileFeed.tsx
@@ -1,14 +1,7 @@
 import React, {useMemo, useCallback} from 'react'
-import {
-  FlatList,
-  NativeScrollEvent,
-  StyleSheet,
-  View,
-  ActivityIndicator,
-} from 'react-native'
+import {FlatList, StyleSheet, View, ActivityIndicator} from 'react-native'
 import {NativeStackScreenProps} from '@react-navigation/native-stack'
 import {useNavigation} from '@react-navigation/native'
-import {useAnimatedScrollHandler} from 'react-native-reanimated'
 import {usePalette} from 'lib/hooks/usePalette'
 import {HeartIcon, HeartIconSolid} from 'lib/icons'
 import {FontAwesomeIcon} from '@fortawesome/react-native-fontawesome'
@@ -33,6 +26,7 @@ import {EmptyState} from 'view/com/util/EmptyState'
 import * as Toast from 'view/com/util/Toast'
 import {useSetTitle} from 'lib/hooks/useSetTitle'
 import {useCustomFeed} from 'lib/hooks/useCustomFeed'
+import {OnScrollCb} from 'lib/hooks/useOnMainScroll'
 import {shareUrl} from 'lib/sharing'
 import {toShareUrl} from 'lib/strings/url-helpers'
 import {Haptics} from 'lib/haptics'
@@ -389,7 +383,7 @@ export const ProfileFeedScreenInner = observer(
 
 interface FeedSectionProps {
   feed: PostsFeedModel
-  onScroll: (e: NativeScrollEvent) => void
+  onScroll: OnScrollCb
   headerHeight: number
   isScrolledDown: boolean
 }
@@ -414,13 +408,12 @@ const FeedSection = React.forwardRef<SectionRef, FeedSectionProps>(
       return <EmptyState icon="feed" message="This feed is empty!" />
     }, [])
 
-    const scrollHandler = useAnimatedScrollHandler({onScroll})
     return (
       <View>
         <Feed
           feed={feed}
           scrollElRef={scrollElRef}
-          onScroll={scrollHandler}
+          onScroll={onScroll}
           scrollEventThrottle={5}
           renderEmptyState={renderPostsEmpty}
           headerOffset={headerHeight}
@@ -450,11 +443,10 @@ const AboutSection = observer(function AboutPageImpl({
   feedInfo: FeedSourceModel | undefined
   headerHeight: number
   onToggleLiked: () => void
-  onScroll: (e: NativeScrollEvent) => void
+  onScroll: OnScrollCb
 }) {
   const pal = usePalette('default')
   const {_} = useLingui()
-  const scrollHandler = useAnimatedScrollHandler({onScroll})
 
   if (!feedInfo) {
     return <View />
@@ -464,7 +456,7 @@ const AboutSection = observer(function AboutPageImpl({
     <ScrollView
       scrollEventThrottle={1}
       contentContainerStyle={{paddingTop: headerHeight}}
-      onScroll={scrollHandler}>
+      onScroll={onScroll}>
       <View
         style={[
           {
diff --git a/src/view/screens/ProfileList.tsx b/src/view/screens/ProfileList.tsx
index 0bbb512c..e473d733 100644
--- a/src/view/screens/ProfileList.tsx
+++ b/src/view/screens/ProfileList.tsx
@@ -2,7 +2,6 @@ import React, {useCallback, useMemo} from 'react'
 import {
   ActivityIndicator,
   FlatList,
-  NativeScrollEvent,
   Pressable,
   StyleSheet,
   View,
@@ -11,7 +10,6 @@ import {useFocusEffect} from '@react-navigation/native'
 import {NativeStackScreenProps, CommonNavigatorParams} from 'lib/routes/types'
 import {useNavigation} from '@react-navigation/native'
 import {FontAwesomeIcon} from '@fortawesome/react-native-fontawesome'
-import {useAnimatedScrollHandler} from 'react-native-reanimated'
 import {observer} from 'mobx-react-lite'
 import {RichText as RichTextAPI} from '@atproto/api'
 import {withAuthRequired} from 'view/com/auth/withAuthRequired'
@@ -35,6 +33,7 @@ import {useStores} from 'state/index'
 import {usePalette} from 'lib/hooks/usePalette'
 import {useSetTitle} from 'lib/hooks/useSetTitle'
 import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
+import {OnScrollCb} from 'lib/hooks/useOnMainScroll'
 import {NavigationProp} from 'lib/routes/types'
 import {toShareUrl} from 'lib/strings/url-helpers'
 import {shareUrl} from 'lib/sharing'
@@ -555,7 +554,7 @@ const Header = observer(function HeaderImpl({
 
 interface FeedSectionProps {
   feed: PostsFeedModel
-  onScroll: (e: NativeScrollEvent) => void
+  onScroll: OnScrollCb
   headerHeight: number
   isScrolledDown: boolean
 }
@@ -579,14 +578,13 @@ const FeedSection = React.forwardRef<SectionRef, FeedSectionProps>(
       return <EmptyState icon="feed" message="This feed is empty!" />
     }, [])
 
-    const scrollHandler = useAnimatedScrollHandler({onScroll})
     return (
       <View>
         <Feed
           testID="listFeed"
           feed={feed}
           scrollElRef={scrollElRef}
-          onScroll={scrollHandler}
+          onScroll={onScroll}
           scrollEventThrottle={1}
           renderEmptyState={renderPostsEmpty}
           headerOffset={headerHeight}
@@ -610,7 +608,7 @@ interface AboutSectionProps {
   isCurateList: boolean | undefined
   isOwner: boolean | undefined
   onPressAddUser: () => void
-  onScroll: (e: NativeScrollEvent) => void
+  onScroll: OnScrollCb
   headerHeight: number
   isScrolledDown: boolean
 }
@@ -741,7 +739,6 @@ const AboutSection = React.forwardRef<SectionRef, AboutSectionProps>(
       )
     }, [])
 
-    const scrollHandler = useAnimatedScrollHandler({onScroll})
     return (
       <View>
         <ListItems
@@ -751,7 +748,7 @@ const AboutSection = React.forwardRef<SectionRef, AboutSectionProps>(
           renderEmptyState={renderEmptyState}
           list={list}
           headerOffset={headerHeight}
-          onScroll={scrollHandler}
+          onScroll={onScroll}
           scrollEventThrottle={1}
         />
         {isScrolledDown && (