Paul Frazee
111 lines
3.1 KiB
TypeScript
111 lines
3.1 KiB
TypeScript
import React, {MutableRefObject} from 'react'
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import {observer} from 'mobx-react-lite'
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import {
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ActivityIndicator,
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View,
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FlatList,
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StyleProp,
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ViewStyle,
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} from 'react-native'
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import {PostFeedLoadingPlaceholder} from '../util/LoadingPlaceholder'
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import {EmptyState} from '../util/EmptyState'
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import {ErrorMessage} from '../util/error/ErrorMessage'
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import {FeedModel} from '../../../state/models/feed-view'
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import {FeedItem} from './FeedItem'
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import {ComposePrompt} from '../composer/Prompt'
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import {OnScrollCb} from '../../lib/hooks/useOnMainScroll'
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const COMPOSE_PROMPT_ITEM = {_reactKey: '__prompt__'}
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const EMPTY_FEED_ITEM = {_reactKey: '__empty__'}
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export const Feed = observer(function Feed({
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feed,
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style,
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scrollElRef,
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onPressCompose,
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onPressTryAgain,
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onScroll,
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}: {
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feed: FeedModel
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style?: StyleProp<ViewStyle>
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scrollElRef?: MutableRefObject<FlatList<any> | null>
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onPressCompose: () => void
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onPressTryAgain?: () => void
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onScroll?: OnScrollCb
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}) {
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// TODO optimize renderItem or FeedItem, we're getting this notice from RN: -prf
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// VirtualizedList: You have a large list that is slow to update - make sure your
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// renderItem function renders components that follow React performance best practices
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// like PureComponent, shouldComponentUpdate, etc
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const renderItem = ({item}: {item: any}) => {
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if (item === COMPOSE_PROMPT_ITEM) {
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return <ComposePrompt onPressCompose={onPressCompose} />
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} else if (item === EMPTY_FEED_ITEM) {
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return (
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<EmptyState
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icon="bars"
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message="This feed is empty!"
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style={{paddingVertical: 40}}
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/>
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)
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} else {
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return <FeedItem item={item} />
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}
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}
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const onRefresh = () => {
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feed
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.refresh()
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.catch(err =>
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feed.rootStore.log.error('Failed to refresh posts feed', err),
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)
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}
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const onEndReached = () => {
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feed
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.loadMore()
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.catch(err => feed.rootStore.log.error('Failed to load more posts', err))
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}
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let data
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if (feed.hasLoaded) {
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if (feed.isEmpty) {
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data = [COMPOSE_PROMPT_ITEM, EMPTY_FEED_ITEM]
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} else {
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data = [COMPOSE_PROMPT_ITEM].concat(feed.feed)
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}
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}
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const FeedFooter = () =>
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feed.isLoading ? (
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<View style={{paddingTop: 20}}>
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<ActivityIndicator />
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</View>
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) : (
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<View />
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)
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return (
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<View style={style}>
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{!data && <ComposePrompt onPressCompose={onPressCompose} />}
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{feed.isLoading && !data && <PostFeedLoadingPlaceholder />}
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{feed.hasError && (
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<ErrorMessage
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message={feed.error}
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style={{margin: 6}}
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onPressTryAgain={onPressTryAgain}
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/>
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)}
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{feed.hasLoaded && data && (
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<FlatList
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ref={scrollElRef}
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data={data}
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keyExtractor={item => item._reactKey}
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renderItem={renderItem}
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ListFooterComponent={FeedFooter}
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refreshing={feed.isRefreshing}
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contentContainerStyle={{paddingBottom: 100}}
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onScroll={onScroll}
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onRefresh={onRefresh}
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onEndReached={onEndReached}
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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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