Paul Frazee
91 lines
2.2 KiB
TypeScript
91 lines
2.2 KiB
TypeScript
import React, {useState, useEffect} from 'react'
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import {observer} from 'mobx-react-lite'
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import {ActivityIndicator, FlatList, Text, View} from 'react-native'
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import {OnNavigateContent} from '../../routes/types'
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import {
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PostThreadViewModel,
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PostThreadViewPostModel,
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} from '../../../state/models/post-thread-view'
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import {useStores} from '../../../state'
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import {PostThreadItem} from './PostThreadItem'
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export const PostThread = observer(function PostThread({
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uri,
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onNavigateContent,
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}: {
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uri: string
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onNavigateContent: OnNavigateContent
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}) {
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const store = useStores()
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const [view, setView] = useState<PostThreadViewModel | undefined>()
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useEffect(() => {
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if (view?.params.uri === uri) {
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console.log('Post thread doing nothing')
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return // no change needed? or trigger refresh?
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}
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console.log('Fetching post thread', uri)
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const newView = new PostThreadViewModel(store, {uri})
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setView(newView)
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newView.setup().catch(err => console.error('Failed to fetch thread', err))
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}, [uri, view?.params.uri, store])
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// not yet setup
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if (
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!view ||
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(view.isLoading && !view.isRefreshing) ||
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view.params.uri !== uri
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) {
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return (
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<View>
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<ActivityIndicator />
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</View>
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)
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}
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// error
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if (view.hasError) {
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return (
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<View>
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<Text>{view.error}</Text>
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</View>
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)
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}
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// rendering
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const posts = Array.from(flattenThread(view.thread))
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const renderItem = ({item}: {item: PostThreadViewPostModel}) => (
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<PostThreadItem item={item} onNavigateContent={onNavigateContent} />
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)
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const onRefresh = () => {
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view.refresh().catch(err => console.error('Failed to refresh', err))
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}
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return (
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<View>
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{view.hasContent && (
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<FlatList
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data={posts}
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keyExtractor={item => item._reactKey}
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renderItem={renderItem}
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refreshing={view.isRefreshing}
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onRefresh={onRefresh}
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/>
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)}
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</View>
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)
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})
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function* flattenThread(
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post: PostThreadViewPostModel,
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): Generator<PostThreadViewPostModel, void> {
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if (post.parent) {
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yield* flattenThread(post.parent)
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}
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yield post
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if (post.replies?.length) {
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for (const reply of post.replies) {
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yield* flattenThread(reply)
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}
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}
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}
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