jollywhoppers.com
Bluesky app fork with some witchin' additions 馃挮
witchsky.app
bluesky
fork
client
samuel.fm
1import {type ForwardedRef, useEffect, useMemo, useRef} from 'react'
2import {type ScrollView} from 'react-native'
3import {Platform} from 'react-native'
4
5import {mergeRefs} from '#/lib/merge-refs'
6
7type Props<Scrollable extends ScrollView = ScrollView> = {
8 cursor?: string
9 outerRef?: ForwardedRef<Scrollable>
10}
11
12export function useDraggableScroll<Scrollable extends ScrollView = ScrollView>({
13 outerRef,
14 cursor = 'grab',
15}: Props<Scrollable> = {}) {
16 const ref = useRef<Scrollable>(null)
17
18 useEffect(() => {
19 if (Platform.OS !== 'web' || !ref.current) {
20 return
21 }
22 const slider = ref.current as unknown as HTMLDivElement
23 let isDragging = false
24 let isMouseDown = false
25 let startX = 0
26 let scrollLeft = 0
27
28 const mouseDown = (e: MouseEvent) => {
29 isMouseDown = true
30 startX = e.pageX - slider.offsetLeft
31 scrollLeft = slider.scrollLeft
32
33 slider.style.cursor = cursor
34 }
35
36 const mouseUp = () => {
37 if (isDragging) {
38 slider.addEventListener('click', e => e.stopPropagation(), {once: true})
39 }
40
41 isMouseDown = false
42 isDragging = false
43 slider.style.cursor = 'default'
44 }
45
46 const mouseMove = (e: MouseEvent) => {
47 if (!isMouseDown) {
48 return
49 }
50
51 // Require n pixels momement before start of drag (3 in this case )
52 const x = e.pageX - slider.offsetLeft
53 if (Math.abs(x - startX) < 3) {
54 return
55 }
56
57 isDragging = true
58 e.preventDefault()
59 const walk = x - startX
60 slider.scrollLeft = scrollLeft - walk
61
62 if (slider.contains(document.activeElement))
63 (document.activeElement as HTMLElement)?.blur?.()
64 }
65
66 slider.addEventListener('mousedown', mouseDown)
67 window.addEventListener('mouseup', mouseUp)
68 window.addEventListener('mousemove', mouseMove)
69
70 return () => {
71 slider.removeEventListener('mousedown', mouseDown)
72 window.removeEventListener('mouseup', mouseUp)
73 window.removeEventListener('mousemove', mouseMove)
74 }
75 }, [cursor])
76
77 const refs = useMemo(
78 () => mergeRefs(outerRef ? [ref, outerRef] : [ref]),
79 [ref, outerRef],
80 )
81
82 return {
83 refs,
84 }
85}