Paul Frazee
77 lines
2.2 KiB
TypeScript
77 lines
2.2 KiB
TypeScript
import React from 'react'
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import {observer} from 'mobx-react-lite'
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import {View, FlatList} from 'react-native'
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import {NotificationsViewModel} from '../../../state/models/notifications-view'
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import {FeedItem} from './FeedItem'
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import {NotificationFeedLoadingPlaceholder} from '../util/LoadingPlaceholder'
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import {ErrorMessage} from '../util/ErrorMessage'
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import {EmptyState} from '../util/EmptyState'
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import {OnScrollCb} from '../../lib/useOnMainScroll'
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const EMPTY_FEED_ITEM = {_reactKey: '__empty__'}
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export const Feed = observer(function Feed({
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view,
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onPressTryAgain,
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onScroll,
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}: {
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view: NotificationsViewModel
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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 === EMPTY_FEED_ITEM) {
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return (
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<EmptyState
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icon="bell"
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message="No notifications yet!"
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style={{paddingVertical: 40}}
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/>
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)
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}
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return <FeedItem item={item} />
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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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const onEndReached = () => {
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view.loadMore().catch(err => console.error('Failed to load more', err))
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}
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let data
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if (view.hasLoaded) {
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if (view.isEmpty) {
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data = [EMPTY_FEED_ITEM]
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} else {
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data = view.notifications
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}
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}
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return (
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<View style={{flex: 1}}>
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{view.isLoading && !data && <NotificationFeedLoadingPlaceholder />}
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{view.hasError && (
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<ErrorMessage
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dark
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message={view.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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{data && (
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<FlatList
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data={data}
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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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onEndReached={onEndReached}
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onScroll={onScroll}
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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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