File size: 2,466 Bytes
abcf568 | 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 | import { useEffect, useRef, useState } from 'react'
import { nextTypeDelay, nextTypeStep } from './studio-command-typing'
export function useStudioCommandPanelAnimation(latestAssistantText: string) {
const [animatedAssistantText, setAnimatedAssistantText] = useState('')
const streamRateRef = useRef(0)
const latestTextMetaRef = useRef<{ text: string; at: number }>({ text: '', at: 0 })
useEffect(() => {
if (!latestAssistantText) {
streamRateRef.current = 0
latestTextMetaRef.current = { text: '', at: 0 }
const frame = window.requestAnimationFrame(() => {
setAnimatedAssistantText('')
})
return () => window.cancelAnimationFrame(frame)
}
const now = Date.now()
const prev = latestTextMetaRef.current
if (prev.text && latestAssistantText.startsWith(prev.text) && latestAssistantText.length > prev.text.length) {
const deltaChars = latestAssistantText.length - prev.text.length
const deltaMs = Math.max(1, now - prev.at)
const charsPerSecond = (deltaChars * 1000) / deltaMs
streamRateRef.current = streamRateRef.current === 0
? charsPerSecond
: streamRateRef.current * 0.68 + charsPerSecond * 0.32
} else if (!prev.text) {
streamRateRef.current = 0
}
latestTextMetaRef.current = { text: latestAssistantText, at: now }
const frame = window.requestAnimationFrame(() => {
setAnimatedAssistantText((current) => {
if (!latestAssistantText.startsWith(current)) {
return latestAssistantText.slice(0, 1)
}
return current || latestAssistantText.slice(0, 1)
})
})
return () => window.cancelAnimationFrame(frame)
}, [latestAssistantText])
useEffect(() => {
if (!latestAssistantText) {
return
}
if (animatedAssistantText === latestAssistantText) {
return
}
const timer = window.setTimeout(() => {
setAnimatedAssistantText((current) => {
if (!latestAssistantText.startsWith(current)) {
return latestAssistantText.slice(0, 1)
}
const nextLength = current.length + nextTypeStep(latestAssistantText.length - current.length)
return latestAssistantText.slice(0, nextLength)
})
}, nextTypeDelay(latestAssistantText, animatedAssistantText.length, streamRateRef.current))
return () => window.clearTimeout(timer)
}, [animatedAssistantText, latestAssistantText])
return animatedAssistantText
}
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