Profile screen performance tweak - Adjust initial num to render based on header height (#5005)

src/lib/hooks/useInitialNumToRender.ts

@@ -1,11 +1,19 @@
-import React from 'react'
-import {Dimensions} from 'react-native'
+import {useWindowDimensions} from 'react-native'
+import {useSafeAreaInsets} from 'react-native-safe-area-context'
+
+import {useBottomBarOffset} from 'lib/hooks/useBottomBarOffset'
 
 const MIN_POST_HEIGHT = 100
 
-export function useInitialNumToRender(minItemHeight: number = MIN_POST_HEIGHT) {
-  return React.useMemo(() => {
-    const screenHeight = Dimensions.get('window').height
-    return Math.ceil(screenHeight / minItemHeight) + 1
-  }, [minItemHeight])
+export function useInitialNumToRender({
+  minItemHeight = MIN_POST_HEIGHT,
+  screenHeightOffset = 0,
+}: {minItemHeight?: number; screenHeightOffset?: number} = {}) {
+  const {height: screenHeight} = useWindowDimensions()
+  const {top: topInset} = useSafeAreaInsets()
+  const bottomBarHeight = useBottomBarOffset()
+
+  const finalHeight =
+    screenHeight - screenHeightOffset - topInset - bottomBarHeight
+  return Math.floor(finalHeight / minItemHeight) + 1
 }