Paul Frazee
77 lines
2.5 KiB
TypeScript
77 lines
2.5 KiB
TypeScript
import React, {MutableRefObject} from 'react'
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import {observer} from 'mobx-react-lite'
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import {View, FlatList, StyleProp, ViewStyle} 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/ErrorMessage'
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import {FeedModel, FeedItemModel} 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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const COMPOSE_PROMPT_ITEM = {_reactKey: '__prompt__'}
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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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}: {
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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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}) {
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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: FeedItemModel}) => {
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if (item === COMPOSE_PROMPT_ITEM) {
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return <ComposePrompt onPressCompose={onPressCompose} />
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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.refresh().catch(err => console.error('Failed to refresh', err))
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}
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const onEndReached = () => {
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feed.loadMore().catch(err => console.error('Failed to load more', err))
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}
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return (
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<View style={style}>
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{feed.isLoading && !feed.isRefreshing && !feed.hasContent && (
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<PostFeedLoadingPlaceholder />
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)}
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{feed.hasError && (
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<ErrorMessage
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dark
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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.hasContent && (
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<FlatList
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ref={scrollElRef}
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data={[COMPOSE_PROMPT_ITEM].concat(feed.feed.slice())}
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keyExtractor={item => item._reactKey}
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renderItem={renderItem}
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refreshing={feed.isRefreshing}
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contentContainerStyle={{paddingBottom: 100}}
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onRefresh={onRefresh}
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onEndReached={onEndReached}
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/>
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)}
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{feed.isEmpty && (
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<View>
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<ComposePrompt onPressCompose={onPressCompose} />
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<EmptyState icon="bars" message="This feed is empty!" />
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</View>
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)}
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</View>
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)
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})
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