jollywhoppers.com
Bluesky app fork with some witchin' additions 💫
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[Lighbox perf - 1] Fix memoization of List component, defer re-rendering when opening lightbox (#9759)
* memoize FlatList_INTERNAL
* defer render, put handleScrolledDownChange in non reactive callback
* lintfix useDedupe
samuel.fm
+4
-4
src/lib/hooks/useDedupe.ts
+4
-4
src/lib/hooks/useDedupe.ts
···
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import React from 'react'
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import {useCallback, useRef} from 'react'
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export const useDedupe = (timeout = 250) => {
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const canDo = React.useRef(true)
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export function useDedupe(timeout = 250) {
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const canDo = useRef(true)
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return React.useCallback(
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return useCallback(
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(cb: () => unknown) => {
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if (canDo.current) {
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canDo.current = false
+10
-7
src/view/com/util/List.tsx
+10
-7
src/view/com/util/List.tsx
···
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import React, {memo} from 'react'
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import {forwardRef, memo, useDeferredValue, useMemo} from 'react'
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import {RefreshControl, type ViewToken} from 'react-native'
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import {
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type FlatListPropsWithLayout,
···
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import {updateActiveVideoViewAsync} from '@haileyok/bluesky-video'
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import {useDedupe} from '#/lib/hooks/useDedupe'
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import {useNonReactiveCallback} from '#/lib/hooks/useNonReactiveCallback'
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import {useScrollHandlers} from '#/lib/ScrollContext'
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import {addStyle} from '#/lib/styles'
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import {useLightbox} from '#/state/lightbox'
···
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const SCROLLED_DOWN_LIMIT = 200
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-
let List = React.forwardRef<ListMethods, ListProps>(
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let List = forwardRef<ListMethods, ListProps>(
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(
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{
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onScrolledDownChange,
···
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const dedupe = useDedupe(400)
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const scrollsToTop = useAllowScrollToTop()
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function handleScrolledDownChange(didScrollDown: boolean) {
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onScrolledDownChange?.(didScrollDown)
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}
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const handleScrolledDownChange = useNonReactiveCallback(
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(didScrollDown: boolean) => {
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onScrolledDownChange?.(didScrollDown)
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},
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)
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// Intentionally destructured outside the main thread closure.
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// See https://github.com/bluesky-social/social-app/pull/4108.
···
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},
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})
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-
const [onViewableItemsChanged, viewabilityConfig] = React.useMemo(() => {
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const [onViewableItemsChanged, viewabilityConfig] = useMemo(() => {
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if (!onItemSeen) {
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return [undefined, undefined]
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}
···
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const useAllowScrollToTop = IS_IOS ? useAllowScrollToTopIOS : () => undefined
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function useAllowScrollToTopIOS() {
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const {activeLightbox} = useLightbox()
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return !activeLightbox
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return useDeferredValue(!activeLightbox)
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}
+3
-4
src/view/com/util/Views.tsx
+3
-4
src/view/com/util/Views.tsx
···
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import {forwardRef} from 'react'
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import {type FlatListComponent} from 'react-native'
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import {View, type ViewProps} from 'react-native'
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import {forwardRef, memo} from 'react'
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import {type FlatListComponent, View, type ViewProps} from 'react-native'
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import Animated from 'react-native-reanimated'
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import {type FlatListPropsWithLayout} from 'react-native-reanimated'
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···
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* Avoid using `FlatList_INTERNAL` and use `List` where possible.
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* The types are a bit wrong on `FlatList_INTERNAL`
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*/
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export const FlatList_INTERNAL = Animated.FlatList
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export const FlatList_INTERNAL = memo(Animated.FlatList)
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export type FlatList_INTERNAL<ItemT = any> = Omit<
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FlatListComponent<ItemT, FlatListPropsWithLayout<ItemT>>,
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'CellRendererComponent'