Remove unnecessary state update for reply gate (#4897)

* Move mobile compose prompt to inner component

* Make canReply computed

* Use same clamp we use elsewhere

src/view/com/post-thread/PostThread.tsx

@@ -1,11 +1,14 @@
-import React, {useEffect, useRef} from 'react'
-import {useWindowDimensions, View} from 'react-native'
+import React, {useRef} from 'react'
+import {StyleSheet, useWindowDimensions, View} from 'react-native'
 import {runOnJS} from 'react-native-reanimated'
+import Animated from 'react-native-reanimated'
+import {useSafeAreaInsets} from 'react-native-safe-area-context'
 import {AppBskyFeedDefs} from '@atproto/api'
 import {msg, Trans} from '@lingui/macro'
 import {useLingui} from '@lingui/react'
 
 import {moderatePost_wrapped as moderatePost} from '#/lib/moderatePost_wrapped'
+import {clamp} from '#/lib/numbers'
 import {ScrollProvider} from '#/lib/ScrollContext'
 import {isAndroid, isNative, isWeb} from '#/platform/detection'
 import {useModerationOpts} from '#/state/preferences/moderation-opts'
@@ -22,6 +25,7 @@ import {
 import {usePreferencesQuery} from '#/state/queries/preferences'
 import {useSession} from '#/state/session'
 import {useInitialNumToRender} from 'lib/hooks/useInitialNumToRender'
+import {useMinimalShellFabTransform} from 'lib/hooks/useMinimalShellTransform'
 import {useSetTitle} from 'lib/hooks/useSetTitle'
 import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
 import {sanitizeDisplayName} from 'lib/strings/display-names'
@@ -82,11 +86,9 @@ const keyExtractor = (item: RowItem) => {
 
 export function PostThread({
   uri,
-  onCanReply,
   onPressReply,
 }: {
   uri: string | undefined
-  onCanReply: (canReply: boolean) => void
   onPressReply: () => unknown
 }) {
   const {hasSession, currentAccount} = useSession()
@@ -210,14 +212,6 @@ export function PostThread({
     return null
   }, [thread, skeleton?.highlightedPost, isThreadError, _, threadError])
 
-  useEffect(() => {
-    if (error) {
-      onCanReply(false)
-    } else if (rootPost) {
-      onCanReply(!rootPost.viewer?.replyDisabled)
-    }
-  }, [rootPost, onCanReply, error])
-
   // construct content
   const posts = React.useMemo(() => {
     if (!skeleton) return []
@@ -313,6 +307,7 @@ export function PostThread({
     setMaxReplies(prev => prev + 50)
   }, [isFetching, maxReplies, posts.length])
 
+  const canReply = !error && rootPost && !rootPost.viewer?.replyDisabled
   const hasParents =
     skeleton?.highlightedPost?.type === 'post' &&
     (skeleton.highlightedPost.ctx.isParentLoading ||
@@ -473,10 +468,30 @@ export function PostThread({
           sideBorders={false}
         />
       </ScrollProvider>
+      {isMobile && canReply && hasSession && (
+        <MobileComposePrompt onPressReply={onPressReply} />
+      )}
     </CenteredView>
   )
 }
 
+function MobileComposePrompt({onPressReply}: {onPressReply: () => unknown}) {
+  const safeAreaInsets = useSafeAreaInsets()
+  const fabMinimalShellTransform = useMinimalShellFabTransform()
+  return (
+    <Animated.View
+      style={[
+        styles.prompt,
+        fabMinimalShellTransform,
+        {
+          bottom: clamp(safeAreaInsets.bottom, 15, 30),
+        },
+      ]}>
+      <ComposePrompt onPressCompose={onPressReply} />
+    </Animated.View>
+  )
+}
+
 function isThreadPost(v: unknown): v is ThreadPost {
   return !!v && typeof v === 'object' && 'type' in v && v.type === 'post'
 }
@@ -622,3 +637,12 @@ function hasBranchingReplies(node?: ThreadNode) {
   }
   return true
 }
+
+const styles = StyleSheet.create({
+  prompt: {
+    // @ts-ignore web-only
+    position: isWeb ? 'fixed' : 'absolute',
+    left: 0,
+    right: 0,
+  },
+})

src/view/screens/PostThread.tsx

@@ -1,39 +1,26 @@
 import React from 'react'
-import {StyleSheet, View} from 'react-native'
-import Animated from 'react-native-reanimated'
-import {useSafeAreaInsets} from 'react-native-safe-area-context'
+import {View} from 'react-native'
 import {useFocusEffect} from '@react-navigation/native'
 import {useQueryClient} from '@tanstack/react-query'
-import {clamp} from 'lodash'
 
-import {isWeb} from '#/platform/detection'
 import {
   RQKEY as POST_THREAD_RQKEY,
   ThreadNode,
 } from '#/state/queries/post-thread'
-import {useSession} from '#/state/session'
 import {useSetMinimalShellMode} from '#/state/shell'
 import {useComposerControls} from '#/state/shell/composer'
-import {useMinimalShellFabTransform} from 'lib/hooks/useMinimalShellTransform'
-import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
 import {CommonNavigatorParams, NativeStackScreenProps} from 'lib/routes/types'
 import {makeRecordUri} from 'lib/strings/url-helpers'
 import {s} from 'lib/styles'
-import {ComposePrompt} from 'view/com/composer/Prompt'
 import {PostThread as PostThreadComponent} from '../com/post-thread/PostThread'
 
 type Props = NativeStackScreenProps<CommonNavigatorParams, 'PostThread'>
 export function PostThreadScreen({route}: Props) {
   const queryClient = useQueryClient()
-  const {hasSession} = useSession()
-  const fabMinimalShellTransform = useMinimalShellFabTransform()
   const setMinimalShellMode = useSetMinimalShellMode()
   const {openComposer} = useComposerControls()
-  const safeAreaInsets = useSafeAreaInsets()
   const {name, rkey} = route.params
-  const {isMobile} = useWebMediaQueries()
   const uri = makeRecordUri(name, 'app.bsky.feed.post', rkey)
-  const [canReply, setCanReply] = React.useState(false)
 
   useFocusEffect(
     React.useCallback(() => {
@@ -67,33 +54,8 @@ export function PostThreadScreen({route}: Props) {
   return (
     <View style={s.hContentRegion}>
       <View style={s.flex1}>
-        <PostThreadComponent
-          uri={uri}
-          onPressReply={onPressReply}
-          onCanReply={setCanReply}
-        />
+        <PostThreadComponent uri={uri} onPressReply={onPressReply} />
       </View>
-      {isMobile && canReply && hasSession && (
-        <Animated.View
-          style={[
-            styles.prompt,
-            fabMinimalShellTransform,
-            {
-              bottom: clamp(safeAreaInsets.bottom, 15, 30),
-            },
-          ]}>
-          <ComposePrompt onPressCompose={onPressReply} />
-        </Animated.View>
-      )}
     </View>
   )
 }
-
-const styles = StyleSheet.create({
-  prompt: {
-    // @ts-ignore web-only
-    position: isWeb ? 'fixed' : 'absolute',
-    left: 0,
-    right: 0,
-  },
-})