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import {useCallback, useEffect, useRef, useState} from 'react'
import {View} from 'react-native'
import {msg} from '@lingui/macro'
import {useLingui} from '@lingui/react'
import type React from 'react'
import {isFirefox, isTouchDevice} from '#/lib/browser'
import {clamp} from '#/lib/numbers'
import {atoms as a, useTheme, web} from '#/alf'
import {useInteractionState} from '#/components/hooks/useInteractionState'
import {formatTime} from './utils'
export function Scrubber({
duration,
currentTime,
onSeek,
onSeekEnd,
onSeekStart,
seekLeft,
seekRight,
togglePlayPause,
drawFocus,
}: {
duration: number
currentTime: number
onSeek: (time: number) => void
onSeekEnd: () => void
onSeekStart: () => void
seekLeft: () => void
seekRight: () => void
togglePlayPause: () => void
drawFocus: () => void
}) {
const {_} = useLingui()
const t = useTheme()
const [scrubberActive, setScrubberActive] = useState(false)
const {
state: hovered,
onIn: onStartHover,
onOut: onEndHover,
} = useInteractionState()
const {state: focused, onIn: onFocus, onOut: onBlur} = useInteractionState()
const [seekPosition, setSeekPosition] = useState(0)
const isSeekingRef = useRef(false)
const barRef = useRef<HTMLDivElement>(null)
const circleRef = useRef<HTMLDivElement>(null)
const seek = useCallback(
(evt: React.PointerEvent<HTMLDivElement>) => {
if (!barRef.current) return
const {left, width} = barRef.current.getBoundingClientRect()
const x = evt.clientX
const percent = clamp((x - left) / width, 0, 1) * duration
onSeek(percent)
setSeekPosition(percent)
},
[duration, onSeek],
)
const onPointerDown = useCallback(
(evt: React.PointerEvent<HTMLDivElement>) => {
const target = evt.target
if (target instanceof Element) {
evt.preventDefault()
target.setPointerCapture(evt.pointerId)
isSeekingRef.current = true
seek(evt)
setScrubberActive(true)
onSeekStart()
}
},
[seek, onSeekStart],
)
const onPointerMove = useCallback(
(evt: React.PointerEvent<HTMLDivElement>) => {
if (isSeekingRef.current) {
evt.preventDefault()
seek(evt)
}
},
[seek],
)
const onPointerUp = useCallback(
(evt: React.PointerEvent<HTMLDivElement>) => {
const target = evt.target
if (isSeekingRef.current && target instanceof Element) {
evt.preventDefault()
target.releasePointerCapture(evt.pointerId)
isSeekingRef.current = false
onSeekEnd()
setScrubberActive(false)
}
},
[onSeekEnd],
)
useEffect(() => {
// HACK: there's divergent browser behaviour about what to do when
// a pointerUp event is fired outside the element that captured the
// pointer. Firefox clicks on the element the mouse is over, so we have
// to make everything unclickable while seeking -sfn
if (isFirefox && scrubberActive) {
document.body.classList.add('force-no-clicks')
return () => {
document.body.classList.remove('force-no-clicks')
}
}
}, [scrubberActive, onSeekEnd])
useEffect(() => {
if (!circleRef.current) return
if (focused) {
const abortController = new AbortController()
const {signal} = abortController
circleRef.current.addEventListener(
'keydown',
evt => {
// space: play/pause
// arrow left: seek backward
// arrow right: seek forward
if (evt.key === ' ') {
evt.preventDefault()
drawFocus()
togglePlayPause()
} else if (evt.key === 'ArrowLeft') {
evt.preventDefault()
drawFocus()
seekLeft()
} else if (evt.key === 'ArrowRight') {
evt.preventDefault()
drawFocus()
seekRight()
}
},
{signal},
)
return () => abortController.abort()
}
}, [focused, seekLeft, seekRight, togglePlayPause, drawFocus])
const progress = scrubberActive ? seekPosition : currentTime
const progressPercent = (progress / duration) * 100
if (duration < 3) return null
return (
<View
testID="scrubber"
style={[
{height: isTouchDevice ? 32 : 18, width: '100%'},
a.flex_shrink_0,
a.px_xs,
]}
onPointerEnter={onStartHover}
onPointerLeave={onEndHover}>
<div
ref={barRef}
style={{
flex: 1,
display: 'flex',
alignItems: 'center',
position: 'relative',
cursor: scrubberActive ? 'grabbing' : 'grab',
padding: '4px 0',
}}
onPointerDown={onPointerDown}
onPointerMove={onPointerMove}
onPointerUp={onPointerUp}
onPointerCancel={onPointerUp}>
<View
style={[
a.w_full,
a.rounded_full,
a.overflow_hidden,
{backgroundColor: 'rgba(255, 255, 255, 0.4)'},
{height: hovered || scrubberActive ? 6 : 3},
web({transition: 'height 0.1s ease'}),
]}>
{duration > 0 && (
<View
style={[
a.h_full,
{backgroundColor: t.palette.white},
{width: `${progressPercent}%`},
]}
/>
)}
</View>
<div
ref={circleRef}
aria-label={_(
msg`Seek slider. Use the arrow keys to seek forwards and backwards, and space to play/pause`,
)}
role="slider"
aria-valuemax={duration}
aria-valuemin={0}
aria-valuenow={currentTime}
aria-valuetext={_(
msg`${formatTime(currentTime)} of ${formatTime(duration)}`,
)}
tabIndex={0}
onFocus={onFocus}
onBlur={onBlur}
style={{
position: 'absolute',
height: 16,
width: 16,
left: `calc(${progressPercent}% - 8px)`,
borderRadius: 8,
pointerEvents: 'none',
}}>
<View
style={[
a.w_full,
a.h_full,
a.rounded_full,
{backgroundColor: t.palette.white},
{
transform: [
{
scale:
hovered || scrubberActive || focused
? scrubberActive
? 1
: 0.6
: 0,
},
],
},
]}
/>
</div>
</div>
</View>
)
}
|
