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
|
import React, {memo} from 'react'
import {FlatListProps, RefreshControl, ViewToken} from 'react-native'
import {runOnJS, useSharedValue} from 'react-native-reanimated'
import {useAnimatedScrollHandler} from '#/lib/hooks/useAnimatedScrollHandler_FIXED'
import {usePalette} from '#/lib/hooks/usePalette'
import {useScrollHandlers} from '#/lib/ScrollContext'
import {addStyle} from 'lib/styles'
import {FlatList_INTERNAL} from './Views'
export type ListMethods = FlatList_INTERNAL
export type ListProps<ItemT> = Omit<
FlatListProps<ItemT>,
| 'onMomentumScrollBegin' // Use ScrollContext instead.
| 'onMomentumScrollEnd' // Use ScrollContext instead.
| 'onScroll' // Use ScrollContext instead.
| 'onScrollBeginDrag' // Use ScrollContext instead.
| 'onScrollEndDrag' // Use ScrollContext instead.
| 'refreshControl' // Pass refreshing and/or onRefresh instead.
| 'contentOffset' // Pass headerOffset instead.
> & {
onScrolledDownChange?: (isScrolledDown: boolean) => void
headerOffset?: number
refreshing?: boolean
onRefresh?: () => void
onItemSeen?: (item: ItemT) => void
containWeb?: boolean
sideBorders?: boolean
// Web only prop to disable a perf optimization (which would otherwise be on).
disableContentVisibility?: boolean
}
export type ListRef = React.MutableRefObject<FlatList_INTERNAL | null>
const SCROLLED_DOWN_LIMIT = 200
function ListImpl<ItemT>(
{
onScrolledDownChange,
refreshing,
onRefresh,
onItemSeen,
headerOffset,
style,
...props
}: ListProps<ItemT>,
ref: React.Ref<ListMethods>,
) {
const isScrolledDown = useSharedValue(false)
const pal = usePalette('default')
function handleScrolledDownChange(didScrollDown: boolean) {
onScrolledDownChange?.(didScrollDown)
}
// Intentionally destructured outside the main thread closure.
// See https://github.com/bluesky-social/social-app/pull/4108.
const {
onBeginDrag: onBeginDragFromContext,
onEndDrag: onEndDragFromContext,
onScroll: onScrollFromContext,
onMomentumEnd: onMomentumEndFromContext,
} = useScrollHandlers()
const scrollHandler = useAnimatedScrollHandler({
onBeginDrag(e, ctx) {
onBeginDragFromContext?.(e, ctx)
},
onEndDrag(e, ctx) {
onEndDragFromContext?.(e, ctx)
},
onScroll(e, ctx) {
onScrollFromContext?.(e, ctx)
const didScrollDown = e.contentOffset.y > SCROLLED_DOWN_LIMIT
if (isScrolledDown.value !== didScrollDown) {
isScrolledDown.value = didScrollDown
if (onScrolledDownChange != null) {
runOnJS(handleScrolledDownChange)(didScrollDown)
}
}
},
// Note: adding onMomentumBegin here makes simulator scroll
// lag on Android. So either don't add it, or figure out why.
onMomentumEnd(e, ctx) {
onMomentumEndFromContext?.(e, ctx)
},
})
const [onViewableItemsChanged, viewabilityConfig] = React.useMemo(() => {
if (!onItemSeen) {
return [undefined, undefined]
}
return [
(info: {viewableItems: Array<ViewToken>; changed: Array<ViewToken>}) => {
for (const item of info.changed) {
if (item.isViewable) {
onItemSeen(item.item)
}
}
},
{
itemVisiblePercentThreshold: 40,
minimumViewTime: 1.5e3,
},
]
}, [onItemSeen])
let refreshControl
if (refreshing !== undefined || onRefresh !== undefined) {
refreshControl = (
<RefreshControl
refreshing={refreshing ?? false}
onRefresh={onRefresh}
tintColor={pal.colors.text}
titleColor={pal.colors.text}
progressViewOffset={headerOffset}
/>
)
}
let contentOffset
if (headerOffset != null) {
style = addStyle(style, {
paddingTop: headerOffset,
})
contentOffset = {x: 0, y: headerOffset * -1}
}
return (
<FlatList_INTERNAL
{...props}
scrollIndicatorInsets={{right: 1}}
contentOffset={contentOffset}
refreshControl={refreshControl}
onScroll={scrollHandler}
scrollEventThrottle={1}
onViewableItemsChanged={onViewableItemsChanged}
viewabilityConfig={viewabilityConfig}
style={style}
ref={ref}
/>
)
}
export const List = memo(React.forwardRef(ListImpl)) as <ItemT>(
props: ListProps<ItemT> & {ref?: React.Ref<ListMethods>},
) => React.ReactElement
|
