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
|
import React, {memo, startTransition} from 'react'
import {FlatListProps} from 'react-native'
import {FlatList_INTERNAL} from './Views'
import {useScrollHandlers} from '#/lib/ScrollContext'
import {runOnJS, useSharedValue} from 'react-native-reanimated'
import {useAnimatedScrollHandler} from '#/lib/hooks/useAnimatedScrollHandler_FIXED'
export type ListMethods = FlatList_INTERNAL
export type ListProps<ItemT> = Omit<
FlatListProps<ItemT>,
'onScroll' // Use ScrollContext instead.
> & {
onScrolledDownChange?: (isScrolledDown: boolean) => void
}
export type ListRef = React.MutableRefObject<FlatList_INTERNAL | null>
const SCROLLED_DOWN_LIMIT = 200
function ListImpl<ItemT>(
{onScrolledDownChange, ...props}: ListProps<ItemT>,
ref: React.Ref<ListMethods>,
) {
const isScrolledDown = useSharedValue(false)
const contextScrollHandlers = useScrollHandlers()
function handleScrolledDownChange(didScrollDown: boolean) {
startTransition(() => {
onScrolledDownChange?.(didScrollDown)
})
}
const scrollHandler = useAnimatedScrollHandler({
onBeginDrag(e, ctx) {
contextScrollHandlers.onBeginDrag?.(e, ctx)
},
onEndDrag(e, ctx) {
contextScrollHandlers.onEndDrag?.(e, ctx)
},
onScroll(e, ctx) {
contextScrollHandlers.onScroll?.(e, ctx)
const didScrollDown = e.contentOffset.y > SCROLLED_DOWN_LIMIT
if (isScrolledDown.value !== didScrollDown) {
isScrolledDown.value = didScrollDown
if (onScrolledDownChange != null) {
runOnJS(handleScrolledDownChange)(didScrollDown)
}
}
},
})
return (
<FlatList_INTERNAL
{...props}
scrollIndicatorInsets={{right: 1}}
onScroll={scrollHandler}
scrollEventThrottle={1}
ref={ref}
/>
)
}
export const List = memo(React.forwardRef(ListImpl)) as <ItemT>(
props: ListProps<ItemT> & {ref?: React.Ref<ListMethods>},
) => React.ReactElement
|
