1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
import React, {MutableRefObject} from 'react'
import {observer} from 'mobx-react-lite'
import {
ActivityIndicator,
RefreshControl,
StyleProp,
StyleSheet,
View,
ViewStyle,
} from 'react-native'
import {FlatList} from '../util/Views'
import {PostFeedLoadingPlaceholder} from '../util/LoadingPlaceholder'
import {ErrorMessage} from '../util/error/ErrorMessage'
import {PostsFeedModel} from 'state/models/feeds/posts'
import {FeedSlice} from './FeedSlice'
import {LoadMoreRetryBtn} from '../util/LoadMoreRetryBtn'
import {OnScrollCb} from 'lib/hooks/useOnMainScroll'
import {s} from 'lib/styles'
import {useAnalytics} from 'lib/analytics/analytics'
import {usePalette} from 'lib/hooks/usePalette'
import {useTheme} from 'lib/ThemeContext'
const LOADING_ITEM = {_reactKey: '__loading__'}
const EMPTY_FEED_ITEM = {_reactKey: '__empty__'}
const ERROR_ITEM = {_reactKey: '__error__'}
const LOAD_MORE_ERROR_ITEM = {_reactKey: '__load_more_error__'}
export const Feed = observer(function Feed({
feed,
style,
scrollElRef,
onScroll,
scrollEventThrottle,
renderEmptyState,
renderEndOfFeed,
testID,
headerOffset = 0,
desktopFixedHeightOffset,
ListHeaderComponent,
extraData,
}: {
feed: PostsFeedModel
style?: StyleProp<ViewStyle>
scrollElRef?: MutableRefObject<FlatList<any> | null>
onScroll?: OnScrollCb
scrollEventThrottle?: number
renderEmptyState: () => JSX.Element
renderEndOfFeed?: () => JSX.Element
testID?: string
headerOffset?: number
desktopFixedHeightOffset?: number
ListHeaderComponent?: () => JSX.Element
extraData?: any
}) {
const pal = usePalette('default')
const theme = useTheme()
const {track} = useAnalytics()
const [isRefreshing, setIsRefreshing] = React.useState(false)
const data = React.useMemo(() => {
let feedItems: any[] = []
if (feed.hasLoaded) {
if (feed.hasError) {
feedItems = feedItems.concat([ERROR_ITEM])
}
if (feed.isEmpty) {
feedItems = feedItems.concat([EMPTY_FEED_ITEM])
} else {
feedItems = feedItems.concat(feed.slices)
}
if (feed.loadMoreError) {
feedItems = feedItems.concat([LOAD_MORE_ERROR_ITEM])
}
} else {
feedItems.push(LOADING_ITEM)
}
return feedItems
}, [
feed.hasError,
feed.hasLoaded,
feed.isEmpty,
feed.slices,
feed.loadMoreError,
])
// events
// =
const onRefresh = React.useCallback(async () => {
track('Feed:onRefresh')
setIsRefreshing(true)
try {
await feed.refresh()
} catch (err) {
feed.rootStore.log.error('Failed to refresh posts feed', err)
}
setIsRefreshing(false)
}, [feed, track, setIsRefreshing])
const onEndReached = React.useCallback(async () => {
if (!feed.hasLoaded || !feed.hasMore) return
track('Feed:onEndReached')
try {
await feed.loadMore()
} catch (err) {
feed.rootStore.log.error('Failed to load more posts', err)
}
}, [feed, track])
const onPressTryAgain = React.useCallback(() => {
feed.refresh()
}, [feed])
const onPressRetryLoadMore = React.useCallback(() => {
feed.retryLoadMore()
}, [feed])
// rendering
// =
const renderItem = React.useCallback(
({item}: {item: any}) => {
if (item === EMPTY_FEED_ITEM) {
return renderEmptyState()
} else if (item === ERROR_ITEM) {
return (
<ErrorMessage
message={feed.error}
onPressTryAgain={onPressTryAgain}
/>
)
} else if (item === LOAD_MORE_ERROR_ITEM) {
return (
<LoadMoreRetryBtn
label="There was an issue fetching posts. Tap here to try again."
onPress={onPressRetryLoadMore}
/>
)
} else if (item === LOADING_ITEM) {
return <PostFeedLoadingPlaceholder />
}
return <FeedSlice slice={item} />
},
[feed, onPressTryAgain, onPressRetryLoadMore, renderEmptyState],
)
const FeedFooter = React.useCallback(
() =>
feed.isLoadingMore ? (
<View style={styles.feedFooter}>
<ActivityIndicator />
</View>
) : !feed.hasMore && !feed.isEmpty && renderEndOfFeed ? (
renderEndOfFeed()
) : (
<View />
),
[feed.isLoadingMore, feed.hasMore, feed.isEmpty, renderEndOfFeed],
)
return (
<View testID={testID} style={style}>
<FlatList
testID={testID ? `${testID}-flatlist` : undefined}
ref={scrollElRef}
data={data}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
ListFooterComponent={FeedFooter}
ListHeaderComponent={ListHeaderComponent}
refreshControl={
<RefreshControl
refreshing={isRefreshing}
onRefresh={onRefresh}
tintColor={pal.colors.text}
titleColor={pal.colors.text}
progressViewOffset={headerOffset}
/>
}
contentContainerStyle={s.contentContainer}
style={{paddingTop: headerOffset}}
onScroll={onScroll}
scrollEventThrottle={scrollEventThrottle}
indicatorStyle={theme.colorScheme === 'dark' ? 'white' : 'black'}
onEndReached={onEndReached}
onEndReachedThreshold={2}
removeClippedSubviews={true}
contentOffset={{x: 0, y: headerOffset * -1}}
extraData={extraData}
// @ts-ignore our .web version only -prf
desktopFixedHeight={
desktopFixedHeightOffset ? desktopFixedHeightOffset : true
}
/>
</View>
)
})
const styles = StyleSheet.create({
feedFooter: {paddingTop: 20},
})
|
