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import React from 'react'
import {StyleSheet, View} from 'react-native'
import {useFocusEffect} from '@react-navigation/native'
import isEqual from 'lodash.isequal'
import {withAuthRequired} from 'view/com/auth/withAuthRequired'
import {FlatList} from 'view/com/util/Views'
import {ViewHeader} from 'view/com/util/ViewHeader'
import {LoadLatestBtn} from 'view/com/util/load-latest/LoadLatestBtn'
import {FAB} from 'view/com/util/fab/FAB'
import {Link} from 'view/com/util/Link'
import {NativeStackScreenProps, FeedsTabNavigatorParams} from 'lib/routes/types'
import {observer} from 'mobx-react-lite'
import {PostsMultiFeedModel} from 'state/models/feeds/multi-feed'
import {MultiFeed} from 'view/com/posts/MultiFeed'
import {usePalette} from 'lib/hooks/usePalette'
import {useTimer} from 'lib/hooks/useTimer'
import {useStores} from 'state/index'
import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
import {useOnMainScroll} from 'lib/hooks/useOnMainScroll'
import {ComposeIcon2, CogIcon} from 'lib/icons'
import {s} from 'lib/styles'
const LOAD_NEW_PROMPT_TIME = 60e3 // 60 seconds
const MOBILE_HEADER_OFFSET = 40
type Props = NativeStackScreenProps<FeedsTabNavigatorParams, 'Feeds'>
export const FeedsScreen = withAuthRequired(
observer<Props>(function FeedsScreenImpl({}: Props) {
const pal = usePalette('default')
const store = useStores()
const {isMobile} = useWebMediaQueries()
const flatListRef = React.useRef<FlatList>(null)
const multifeed = React.useMemo<PostsMultiFeedModel>(
() => new PostsMultiFeedModel(store),
[store],
)
const [onMainScroll, isScrolledDown, resetMainScroll] =
useOnMainScroll(store)
const [loadPromptVisible, setLoadPromptVisible] = React.useState(false)
const [resetPromptTimer] = useTimer(LOAD_NEW_PROMPT_TIME, () => {
setLoadPromptVisible(true)
})
const onSoftReset = React.useCallback(() => {
flatListRef.current?.scrollToOffset({offset: 0})
multifeed.loadLatest()
resetPromptTimer()
setLoadPromptVisible(false)
resetMainScroll()
}, [
flatListRef,
resetMainScroll,
multifeed,
resetPromptTimer,
setLoadPromptVisible,
])
useFocusEffect(
React.useCallback(() => {
const softResetSub = store.onScreenSoftReset(onSoftReset)
const multifeedCleanup = multifeed.registerListeners()
const cleanup = () => {
softResetSub.remove()
multifeedCleanup()
}
store.shell.setMinimalShellMode(false)
return cleanup
}, [store, multifeed, onSoftReset]),
)
React.useEffect(() => {
if (
isEqual(
multifeed.feedInfos.map(f => f.uri),
store.me.savedFeeds.all.map(f => f.uri),
)
) {
// no changes
return
}
multifeed.refresh()
}, [multifeed, store.me.savedFeeds.all])
const onPressCompose = React.useCallback(() => {
store.shell.openComposer({})
}, [store])
const renderHeaderBtn = React.useCallback(() => {
return (
<Link
href="/settings/saved-feeds"
hitSlop={10}
accessibilityRole="button"
accessibilityLabel="Edit Saved Feeds"
accessibilityHint="Opens screen to edit Saved Feeds">
<CogIcon size={22} strokeWidth={2} style={pal.textLight} />
</Link>
)
}, [pal])
return (
<View style={[pal.view, styles.container]}>
<MultiFeed
scrollElRef={flatListRef}
multifeed={multifeed}
onScroll={onMainScroll}
scrollEventThrottle={100}
headerOffset={isMobile ? MOBILE_HEADER_OFFSET : undefined}
/>
{isMobile && (
<ViewHeader
title="My Feeds"
canGoBack={false}
hideOnScroll
renderButton={renderHeaderBtn}
/>
)}
{isScrolledDown || loadPromptVisible ? (
<LoadLatestBtn
onPress={onSoftReset}
label="Load latest posts"
showIndicator={loadPromptVisible}
/>
) : null}
<FAB
testID="composeFAB"
onPress={onPressCompose}
icon={<ComposeIcon2 strokeWidth={1.5} size={29} style={s.white} />}
accessibilityRole="button"
accessibilityLabel="New post"
accessibilityHint=""
/>
</View>
)
}),
)
const styles = StyleSheet.create({
container: {
flex: 1,
},
})
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