Hailey
522 lines
16 KiB
TypeScript
522 lines
16 KiB
TypeScript
import React, {useEffect, useRef} from 'react'
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import {StyleSheet, useWindowDimensions, View} from 'react-native'
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import {runOnJS} from 'react-native-reanimated'
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import {AppBskyFeedDefs} from '@atproto/api'
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import {msg, Trans} from '@lingui/macro'
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import {useLingui} from '@lingui/react'
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import {moderatePost_wrapped as moderatePost} from '#/lib/moderatePost_wrapped'
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import {ScrollProvider} from '#/lib/ScrollContext'
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import {isAndroid, isNative, isWeb} from '#/platform/detection'
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import {useModerationOpts} from '#/state/preferences/moderation-opts'
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import {
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sortThread,
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ThreadBlocked,
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ThreadNode,
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ThreadNotFound,
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ThreadPost,
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usePostThreadQuery,
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} from '#/state/queries/post-thread'
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import {usePreferencesQuery} from '#/state/queries/preferences'
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import {useSession} from '#/state/session'
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import {useInitialNumToRender} from 'lib/hooks/useInitialNumToRender'
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import {usePalette} from 'lib/hooks/usePalette'
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import {useSetTitle} from 'lib/hooks/useSetTitle'
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import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
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import {sanitizeDisplayName} from 'lib/strings/display-names'
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import {cleanError} from 'lib/strings/errors'
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import {ListFooter, ListMaybePlaceholder} from '#/components/Lists'
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import {ComposePrompt} from '../composer/Prompt'
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import {List, ListMethods} from '../util/List'
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import {Text} from '../util/text/Text'
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import {ViewHeader} from '../util/ViewHeader'
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import {PostThreadItem} from './PostThreadItem'
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// FlatList maintainVisibleContentPosition breaks if too many items
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// are prepended. This seems to be an optimal number based on *shrug*.
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const PARENTS_CHUNK_SIZE = 15
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const MAINTAIN_VISIBLE_CONTENT_POSITION = {
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// We don't insert any elements before the root row while loading.
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// So the row we want to use as the scroll anchor is the first row.
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minIndexForVisible: 0,
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}
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const TOP_COMPONENT = {_reactKey: '__top_component__'}
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const REPLY_PROMPT = {_reactKey: '__reply__'}
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const LOAD_MORE = {_reactKey: '__load_more__'}
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type YieldedItem = ThreadPost | ThreadBlocked | ThreadNotFound
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type RowItem =
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| YieldedItem
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// TODO: TS doesn't actually enforce it's one of these, it only enforces matching shape.
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| typeof TOP_COMPONENT
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| typeof REPLY_PROMPT
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| typeof LOAD_MORE
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type ThreadSkeletonParts = {
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parents: YieldedItem[]
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highlightedPost: ThreadNode
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replies: YieldedItem[]
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}
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const keyExtractor = (item: RowItem) => {
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return item._reactKey
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}
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export function PostThread({
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uri,
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onCanReply,
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onPressReply,
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}: {
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uri: string | undefined
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onCanReply: (canReply: boolean) => void
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onPressReply: () => unknown
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}) {
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const {hasSession} = useSession()
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const {_} = useLingui()
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const pal = usePalette('default')
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const {isMobile, isTabletOrMobile} = useWebMediaQueries()
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const initialNumToRender = useInitialNumToRender()
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const {height: windowHeight} = useWindowDimensions()
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const {data: preferences} = usePreferencesQuery()
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const {
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isFetching,
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isError: isThreadError,
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error: threadError,
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refetch,
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data: thread,
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} = usePostThreadQuery(uri)
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const treeView = React.useMemo(
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() =>
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!!preferences?.threadViewPrefs?.lab_treeViewEnabled &&
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hasBranchingReplies(thread),
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[preferences?.threadViewPrefs, thread],
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)
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const rootPost = thread?.type === 'post' ? thread.post : undefined
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const rootPostRecord = thread?.type === 'post' ? thread.record : undefined
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const moderationOpts = useModerationOpts()
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const isNoPwi = React.useMemo(() => {
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const mod =
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rootPost && moderationOpts
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? moderatePost(rootPost, moderationOpts)
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: undefined
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return !!mod
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?.ui('contentList')
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.blurs.find(
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cause =>
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cause.type === 'label' &&
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cause.labelDef.identifier === '!no-unauthenticated',
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)
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}, [rootPost, moderationOpts])
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// Values used for proper rendering of parents
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const ref = useRef<ListMethods>(null)
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const highlightedPostRef = useRef<View | null>(null)
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const [maxParents, setMaxParents] = React.useState(
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isWeb ? Infinity : PARENTS_CHUNK_SIZE,
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)
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const [maxReplies, setMaxReplies] = React.useState(50)
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useSetTitle(
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rootPost && !isNoPwi
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? `${sanitizeDisplayName(
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rootPost.author.displayName || `@${rootPost.author.handle}`,
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)}: "${rootPostRecord!.text}"`
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: '',
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)
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// On native, this is going to start out `true`. We'll toggle it to `false` after the initial render if flushed.
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// This ensures that the first render contains no parents--even if they are already available in the cache.
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// We need to delay showing them so that we can use maintainVisibleContentPosition to keep the main post on screen.
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// On the web this is not necessary because we can synchronously adjust the scroll in onContentSizeChange instead.
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const [deferParents, setDeferParents] = React.useState(isNative)
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const skeleton = React.useMemo(() => {
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const threadViewPrefs = preferences?.threadViewPrefs
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if (!threadViewPrefs || !thread) return null
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return createThreadSkeleton(
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sortThread(thread, threadViewPrefs),
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hasSession,
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treeView,
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)
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}, [thread, preferences?.threadViewPrefs, hasSession, treeView])
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const error = React.useMemo(() => {
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if (AppBskyFeedDefs.isNotFoundPost(thread)) {
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return {
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title: _(msg`Post not found`),
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message: _(msg`The post may have been deleted.`),
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}
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} else if (skeleton?.highlightedPost.type === 'blocked') {
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return {
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title: _(msg`Post hidden`),
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message: _(
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msg`You have blocked the author or you have been blocked by the author.`,
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),
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}
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} else if (threadError?.message.startsWith('Post not found')) {
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return {
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title: _(msg`Post not found`),
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message: _(msg`The post may have been deleted.`),
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}
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} else if (isThreadError) {
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return {
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message: threadError ? cleanError(threadError) : undefined,
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}
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}
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return null
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}, [thread, skeleton?.highlightedPost, isThreadError, _, threadError])
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useEffect(() => {
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if (error) {
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onCanReply(false)
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} else if (rootPost) {
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onCanReply(!rootPost.viewer?.replyDisabled)
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}
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}, [rootPost, onCanReply, error])
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// construct content
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const posts = React.useMemo(() => {
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if (!skeleton) return []
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const {parents, highlightedPost, replies} = skeleton
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let arr: RowItem[] = []
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if (highlightedPost.type === 'post') {
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const isRoot =
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!highlightedPost.parent && !highlightedPost.ctx.isParentLoading
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if (isRoot) {
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// No parents to load.
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arr.push(TOP_COMPONENT)
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} else {
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if (highlightedPost.ctx.isParentLoading || deferParents) {
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// We're loading parents of the highlighted post.
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// In this case, we don't render anything above the post.
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// If you add something here, you'll need to update both
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// maintainVisibleContentPosition and onContentSizeChange
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// to "hold onto" the correct row instead of the first one.
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} else {
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// Everything is loaded
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let startIndex = Math.max(0, parents.length - maxParents)
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if (startIndex === 0) {
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arr.push(TOP_COMPONENT)
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} else {
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// When progressively revealing parents, rendering a placeholder
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// here will cause scrolling jumps. Don't add it unless you test it.
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// QT'ing this thread is a great way to test all the scrolling hacks:
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// https://bsky.app/profile/www.mozzius.dev/post/3kjqhblh6qk2o
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}
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for (let i = startIndex; i < parents.length; i++) {
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arr.push(parents[i])
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}
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}
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}
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arr.push(highlightedPost)
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if (!highlightedPost.post.viewer?.replyDisabled) {
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arr.push(REPLY_PROMPT)
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}
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for (let i = 0; i < replies.length; i++) {
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arr.push(replies[i])
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if (i === maxReplies) {
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break
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}
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}
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}
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return arr
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}, [skeleton, deferParents, maxParents, maxReplies])
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// This is only used on the web to keep the post in view when its parents load.
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// On native, we rely on `maintainVisibleContentPosition` instead.
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const didAdjustScrollWeb = useRef<boolean>(false)
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const onContentSizeChangeWeb = React.useCallback(() => {
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// only run once
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if (didAdjustScrollWeb.current) {
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return
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}
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// wait for loading to finish
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if (thread?.type === 'post' && !!thread.parent) {
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function onMeasure(pageY: number) {
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ref.current?.scrollToOffset({
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animated: false,
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offset: pageY,
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})
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}
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// Measure synchronously to avoid a layout jump.
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const domNode = highlightedPostRef.current
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if (domNode) {
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const pageY = (domNode as any as Element).getBoundingClientRect().top
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onMeasure(pageY)
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}
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didAdjustScrollWeb.current = true
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}
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}, [thread])
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// On native, we reveal parents in chunks. Although they're all already
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// loaded and FlatList already has its own virtualization, unfortunately FlatList
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// has a bug that causes the content to jump around if too many items are getting
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// prepended at once. It also jumps around if items get prepended during scroll.
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// To work around this, we prepend rows after scroll bumps against the top and rests.
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const needsBumpMaxParents = React.useRef(false)
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const onStartReached = React.useCallback(() => {
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if (skeleton?.parents && maxParents < skeleton.parents.length) {
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needsBumpMaxParents.current = true
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}
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}, [maxParents, skeleton?.parents])
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const bumpMaxParentsIfNeeded = React.useCallback(() => {
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if (!isNative) {
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return
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}
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if (needsBumpMaxParents.current) {
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needsBumpMaxParents.current = false
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setMaxParents(n => n + PARENTS_CHUNK_SIZE)
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}
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}, [])
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const onScrollToTop = bumpMaxParentsIfNeeded
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const onMomentumEnd = React.useCallback(() => {
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'worklet'
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runOnJS(bumpMaxParentsIfNeeded)()
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}, [bumpMaxParentsIfNeeded])
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const onEndReached = React.useCallback(() => {
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if (isFetching || posts.length < maxReplies) return
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setMaxReplies(prev => prev + 50)
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}, [isFetching, maxReplies, posts.length])
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const renderItem = React.useCallback(
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({item, index}: {item: RowItem; index: number}) => {
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if (item === TOP_COMPONENT) {
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return isTabletOrMobile ? (
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<ViewHeader
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title={_(msg({message: `Post`, context: 'description'}))}
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/>
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) : null
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} else if (item === REPLY_PROMPT && hasSession) {
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return (
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<View>
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{!isMobile && <ComposePrompt onPressCompose={onPressReply} />}
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</View>
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)
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} else if (isThreadNotFound(item)) {
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return (
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<View style={[pal.border, pal.viewLight, styles.itemContainer]}>
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<Text type="lg-bold" style={pal.textLight}>
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<Trans>Deleted post.</Trans>
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</Text>
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</View>
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)
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} else if (isThreadBlocked(item)) {
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return (
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<View style={[pal.border, pal.viewLight, styles.itemContainer]}>
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<Text type="lg-bold" style={pal.textLight}>
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<Trans>Blocked post.</Trans>
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</Text>
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</View>
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)
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} else if (isThreadPost(item)) {
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const prev = isThreadPost(posts[index - 1])
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? (posts[index - 1] as ThreadPost)
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: undefined
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const next = isThreadPost(posts[index - 1])
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? (posts[index - 1] as ThreadPost)
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: undefined
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const hasUnrevealedParents =
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index === 0 &&
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skeleton?.parents &&
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maxParents < skeleton.parents.length
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return (
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<View
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ref={item.ctx.isHighlightedPost ? highlightedPostRef : undefined}
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onLayout={deferParents ? () => setDeferParents(false) : undefined}>
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<PostThreadItem
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post={item.post}
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record={item.record}
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treeView={treeView}
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depth={item.ctx.depth}
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prevPost={prev}
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nextPost={next}
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isHighlightedPost={item.ctx.isHighlightedPost}
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hasMore={item.ctx.hasMore}
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showChildReplyLine={item.ctx.showChildReplyLine}
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showParentReplyLine={item.ctx.showParentReplyLine}
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hasPrecedingItem={
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!!prev?.ctx.showChildReplyLine || !!hasUnrevealedParents
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}
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onPostReply={refetch}
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/>
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</View>
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)
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}
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return null
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},
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[
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hasSession,
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isTabletOrMobile,
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_,
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isMobile,
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onPressReply,
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pal.border,
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pal.viewLight,
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pal.textLight,
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posts,
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skeleton?.parents,
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maxParents,
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deferParents,
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treeView,
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refetch,
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],
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)
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if (!thread || !preferences || error) {
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return (
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<ListMaybePlaceholder
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isLoading={!error}
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isError={Boolean(error)}
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noEmpty
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onRetry={refetch}
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errorTitle={error?.title}
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errorMessage={error?.message}
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/>
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)
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}
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return (
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<ScrollProvider onMomentumEnd={onMomentumEnd}>
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<List
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ref={ref}
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data={posts}
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renderItem={renderItem}
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keyExtractor={keyExtractor}
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onContentSizeChange={isNative ? undefined : onContentSizeChangeWeb}
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onStartReached={onStartReached}
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onEndReached={onEndReached}
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onEndReachedThreshold={2}
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onScrollToTop={onScrollToTop}
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maintainVisibleContentPosition={
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isNative ? MAINTAIN_VISIBLE_CONTENT_POSITION : undefined
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}
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// @ts-ignore our .web version only -prf
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desktopFixedHeight
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removeClippedSubviews={isAndroid ? false : undefined}
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ListFooterComponent={
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<ListFooter
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// Using `isFetching` over `isFetchingNextPage` is done on purpose here so we get the loader on
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// initial render
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isFetchingNextPage={isFetching}
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error={cleanError(threadError)}
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onRetry={refetch}
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// 300 is based on the minimum height of a post. This is enough extra height for the `maintainVisPos` to
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// work without causing weird jumps on web or glitches on native
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height={windowHeight - 200}
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/>
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}
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initialNumToRender={initialNumToRender}
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windowSize={11}
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/>
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</ScrollProvider>
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)
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}
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function isThreadPost(v: unknown): v is ThreadPost {
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return !!v && typeof v === 'object' && 'type' in v && v.type === 'post'
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}
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function isThreadNotFound(v: unknown): v is ThreadNotFound {
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return !!v && typeof v === 'object' && 'type' in v && v.type === 'not-found'
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}
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function isThreadBlocked(v: unknown): v is ThreadBlocked {
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return !!v && typeof v === 'object' && 'type' in v && v.type === 'blocked'
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}
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function createThreadSkeleton(
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node: ThreadNode,
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hasSession: boolean,
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treeView: boolean,
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): ThreadSkeletonParts | null {
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if (!node) return null
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return {
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parents: Array.from(flattenThreadParents(node, hasSession)),
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highlightedPost: node,
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replies: Array.from(flattenThreadReplies(node, hasSession, treeView)),
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}
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}
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function* flattenThreadParents(
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node: ThreadNode,
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hasSession: boolean,
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): Generator<YieldedItem, void> {
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if (node.type === 'post') {
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if (node.parent) {
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yield* flattenThreadParents(node.parent, hasSession)
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}
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if (!node.ctx.isHighlightedPost) {
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yield node
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}
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} else if (node.type === 'not-found') {
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yield node
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} else if (node.type === 'blocked') {
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yield node
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}
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}
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function* flattenThreadReplies(
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node: ThreadNode,
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hasSession: boolean,
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treeView: boolean,
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): Generator<YieldedItem, void> {
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if (node.type === 'post') {
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if (!hasSession && hasPwiOptOut(node)) {
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return
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}
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if (!node.ctx.isHighlightedPost) {
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yield node
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}
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if (node.replies?.length) {
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for (const reply of node.replies) {
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yield* flattenThreadReplies(reply, hasSession, treeView)
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if (!treeView && !node.ctx.isHighlightedPost) {
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break
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}
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}
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}
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} else if (node.type === 'not-found') {
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yield node
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} else if (node.type === 'blocked') {
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yield node
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}
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}
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function hasPwiOptOut(node: ThreadPost) {
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return !!node.post.author.labels?.find(l => l.val === '!no-unauthenticated')
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}
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function hasBranchingReplies(node?: ThreadNode) {
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if (!node) {
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return false
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}
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if (node.type !== 'post') {
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return false
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}
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if (!node.replies) {
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return false
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}
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if (node.replies.length === 1) {
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return hasBranchingReplies(node.replies[0])
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}
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return true
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}
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const styles = StyleSheet.create({
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itemContainer: {
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borderTopWidth: 1,
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paddingHorizontal: 18,
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paddingVertical: 18,
|
|
},
|
|
})
|