Fix (#4430): Use separate hooks for shell mode animated styles (#4451)

* Fix (#4430): Use separate hooks for shell mode animated styles

* Consolidate in one file

---------

Co-authored-by: Dan Abramov <dan.abramov@gmail.com>

src/lib/hooks/useMinimalShellTransform.ts

@@ -1,23 +1,15 @@
 import {interpolate, useAnimatedStyle} from 'react-native-reanimated'
-import {useMinimalShellMode as useMinimalShellModeState} from '#/state/shell/minimal-mode'
+
+import {useMinimalShellMode} from '#/state/shell/minimal-mode'
 import {useShellLayout} from '#/state/shell/shell-layout'
 
-export function useMinimalShellMode() {
-  const mode = useMinimalShellModeState()
-  const {footerHeight, headerHeight} = useShellLayout()
+// Keep these separated so that we only pay for useAnimatedStyle that gets used.
 
-  const footerMinimalShellTransform = useAnimatedStyle(() => {
-    return {
-      pointerEvents: mode.value === 0 ? 'auto' : 'none',
-      opacity: Math.pow(1 - mode.value, 2),
-      transform: [
-        {
-          translateY: interpolate(mode.value, [0, 1], [0, footerHeight.value]),
-        },
-      ],
-    }
-  })
-  const headerMinimalShellTransform = useAnimatedStyle(() => {
+export function useMinimalShellHeaderTransform() {
+  const mode = useMinimalShellMode()
+  const {headerHeight} = useShellLayout()
+
+  const headerTransform = useAnimatedStyle(() => {
     return {
       pointerEvents: mode.value === 0 ? 'auto' : 'none',
       opacity: Math.pow(1 - mode.value, 2),
@@ -28,7 +20,32 @@ export function useMinimalShellMode() {
       ],
     }
   })
-  const fabMinimalShellTransform = useAnimatedStyle(() => {
+
+  return headerTransform
+}
+
+export function useMinimalShellFooterTransform() {
+  const mode = useMinimalShellMode()
+  const {footerHeight} = useShellLayout()
+
+  const footerTransform = useAnimatedStyle(() => {
+    return {
+      pointerEvents: mode.value === 0 ? 'auto' : 'none',
+      opacity: Math.pow(1 - mode.value, 2),
+      transform: [
+        {
+          translateY: interpolate(mode.value, [0, 1], [0, footerHeight.value]),
+        },
+      ],
+    }
+  })
+  return footerTransform
+}
+
+export function useMinimalShellFabTransform() {
+  const mode = useMinimalShellMode()
+
+  const fabTransform = useAnimatedStyle(() => {
     return {
       transform: [
         {
@@ -37,9 +54,5 @@ export function useMinimalShellMode() {
       ],
     }
   })
-  return {
-    footerMinimalShellTransform,
-    headerMinimalShellTransform,
-    fabMinimalShellTransform,
-  }
+  return fabTransform
 }

src/view/com/home/HomeHeaderLayout.web.tsx

@@ -11,7 +11,7 @@ import {useLingui} from '@lingui/react'
 import {CogIcon} from '#/lib/icons'
 import {useSession} from '#/state/session'
 import {useShellLayout} from '#/state/shell/shell-layout'
-import {useMinimalShellMode} from 'lib/hooks/useMinimalShellMode'
+import {useMinimalShellHeaderTransform} from 'lib/hooks/useMinimalShellTransform'
 import {usePalette} from 'lib/hooks/usePalette'
 import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
 import {Logo} from '#/view/icons/Logo'
@@ -39,7 +39,7 @@ function HomeHeaderLayoutDesktopAndTablet({
   tabBarAnchor: JSX.Element | null | undefined
 }) {
   const pal = usePalette('default')
-  const {headerMinimalShellTransform} = useMinimalShellMode()
+  const headerMinimalShellTransform = useMinimalShellHeaderTransform()
   const {headerHeight} = useShellLayout()
   const {hasSession} = useSession()
   const {_} = useLingui()

src/view/com/home/HomeHeaderLayoutMobile.tsx

@@ -10,7 +10,7 @@ import {useSession} from '#/state/session'
 import {useSetDrawerOpen} from '#/state/shell/drawer-open'
 import {useShellLayout} from '#/state/shell/shell-layout'
 import {HITSLOP_10} from 'lib/constants'
-import {useMinimalShellMode} from 'lib/hooks/useMinimalShellMode'
+import {useMinimalShellHeaderTransform} from 'lib/hooks/useMinimalShellTransform'
 import {usePalette} from 'lib/hooks/usePalette'
 import {isWeb} from 'platform/detection'
 import {Logo} from '#/view/icons/Logo'
@@ -30,7 +30,7 @@ export function HomeHeaderLayoutMobile({
   const {_} = useLingui()
   const setDrawerOpen = useSetDrawerOpen()
   const {headerHeight} = useShellLayout()
-  const {headerMinimalShellTransform} = useMinimalShellMode()
+  const headerMinimalShellTransform = useMinimalShellHeaderTransform()
   const {hasSession} = useSession()
 
   const onPressAvi = React.useCallback(() => {

src/view/com/util/ViewHeader.tsx

@@ -8,7 +8,7 @@ import {useNavigation} from '@react-navigation/native'
 
 import {useSetDrawerOpen} from '#/state/shell'
 import {useAnalytics} from 'lib/analytics/analytics'
-import {useMinimalShellMode} from 'lib/hooks/useMinimalShellMode'
+import {useMinimalShellHeaderTransform} from 'lib/hooks/useMinimalShellTransform'
 import {usePalette} from 'lib/hooks/usePalette'
 import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
 import {NavigationProp} from 'lib/routes/types'
@@ -197,7 +197,7 @@ function Container({
   showBorder?: boolean
 }) {
   const pal = usePalette('default')
-  const {headerMinimalShellTransform} = useMinimalShellMode()
+  const headerMinimalShellTransform = useMinimalShellHeaderTransform()
 
   if (!hideOnScroll) {
     return (

src/view/com/util/fab/FABInner.tsx

@@ -4,7 +4,7 @@ import Animated, {useAnimatedStyle, withTiming} from 'react-native-reanimated'
 import {useSafeAreaInsets} from 'react-native-safe-area-context'
 import {LinearGradient} from 'expo-linear-gradient'
 
-import {useMinimalShellMode} from '#/lib/hooks/useMinimalShellMode'
+import {useMinimalShellFabTransform} from '#/lib/hooks/useMinimalShellTransform'
 import {useWebMediaQueries} from '#/lib/hooks/useWebMediaQueries'
 import {clamp} from '#/lib/numbers'
 import {gradients} from '#/lib/styles'
@@ -20,7 +20,7 @@ export interface FABProps
 export function FABInner({testID, icon, ...props}: FABProps) {
   const insets = useSafeAreaInsets()
   const {isMobile, isTablet} = useWebMediaQueries()
-  const {fabMinimalShellTransform} = useMinimalShellMode()
+  const fabMinimalShellTransform = useMinimalShellFabTransform()
   const {
     state: pressed,
     onIn: onPressIn,

src/view/com/util/load-latest/LoadLatestBtn.tsx

@@ -6,7 +6,7 @@ import {FontAwesomeIcon} from '@fortawesome/react-native-fontawesome'
 import {useMediaQuery} from 'react-responsive'
 
 import {HITSLOP_20} from '#/lib/constants'
-import {useMinimalShellMode} from '#/lib/hooks/useMinimalShellMode'
+import {useMinimalShellFabTransform} from '#/lib/hooks/useMinimalShellTransform'
 import {usePalette} from '#/lib/hooks/usePalette'
 import {useWebMediaQueries} from '#/lib/hooks/useWebMediaQueries'
 import {clamp} from '#/lib/numbers'
@@ -30,7 +30,7 @@ export function LoadLatestBtn({
   const pal = usePalette('default')
   const {hasSession} = useSession()
   const {isDesktop, isTablet, isMobile, isTabletOrMobile} = useWebMediaQueries()
-  const {fabMinimalShellTransform} = useMinimalShellMode()
+  const fabMinimalShellTransform = useMinimalShellFabTransform()
   const insets = useSafeAreaInsets()
 
   // move button inline if it starts overlapping the left nav

src/view/screens/PostThread.tsx

@@ -14,7 +14,7 @@ import {
 import {useSession} from '#/state/session'
 import {useSetMinimalShellMode} from '#/state/shell'
 import {useComposerControls} from '#/state/shell/composer'
-import {useMinimalShellMode} from 'lib/hooks/useMinimalShellMode'
+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'
@@ -26,7 +26,7 @@ type Props = NativeStackScreenProps<CommonNavigatorParams, 'PostThread'>
 export function PostThreadScreen({route}: Props) {
   const queryClient = useQueryClient()
   const {hasSession} = useSession()
-  const {fabMinimalShellTransform} = useMinimalShellMode()
+  const fabMinimalShellTransform = useMinimalShellFabTransform()
   const setMinimalShellMode = useSetMinimalShellMode()
   const {openComposer} = useComposerControls()
   const safeAreaInsets = useSafeAreaInsets()

src/view/shell/bottom-bar/BottomBar.tsx

@@ -10,7 +10,7 @@ import {StackActions} from '@react-navigation/native'
 import {useAnalytics} from '#/lib/analytics/analytics'
 import {useHaptics} from '#/lib/haptics'
 import {useDedupe} from '#/lib/hooks/useDedupe'
-import {useMinimalShellMode} from '#/lib/hooks/useMinimalShellMode'
+import {useMinimalShellFooterTransform} from '#/lib/hooks/useMinimalShellTransform'
 import {useNavigationTabState} from '#/lib/hooks/useNavigationTabState'
 import {usePalette} from '#/lib/hooks/usePalette'
 import {clamp} from '#/lib/numbers'
@@ -66,7 +66,7 @@ export function BottomBar({navigation}: BottomTabBarProps) {
     useNavigationTabState()
   const numUnreadNotifications = useUnreadNotifications()
   const numUnreadMessages = useUnreadMessageCount()
-  const {footerMinimalShellTransform} = useMinimalShellMode()
+  const footerMinimalShellTransform = useMinimalShellFooterTransform()
   const {data: profile} = useProfileQuery({did: currentAccount?.did})
   const {requestSwitchToAccount} = useLoggedOutViewControls()
   const closeAllActiveElements = useCloseAllActiveElements()

src/view/shell/bottom-bar/BottomBarWeb.tsx

@@ -6,7 +6,7 @@ import {msg, Trans} from '@lingui/macro'
 import {useLingui} from '@lingui/react'
 import {useNavigationState} from '@react-navigation/native'
 
-import {useMinimalShellMode} from '#/lib/hooks/useMinimalShellMode'
+import {useMinimalShellFooterTransform} from '#/lib/hooks/useMinimalShellTransform'
 import {usePalette} from '#/lib/hooks/usePalette'
 import {clamp} from '#/lib/numbers'
 import {getCurrentRoute, isTab} from '#/lib/routes/helpers'
@@ -50,7 +50,7 @@ export function BottomBarWeb() {
   const pal = usePalette('default')
   const safeAreaInsets = useSafeAreaInsets()
   const gate = useGate()
-  const {footerMinimalShellTransform} = useMinimalShellMode()
+  const footerMinimalShellTransform = useMinimalShellFooterTransform()
   const {requestSwitchToAccount} = useLoggedOutViewControls()
   const closeAllActiveElements = useCloseAllActiveElements()
   const iconWidth = 26