Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import type { MutableRefObject } from 'react'
// Playback speed steps (YouTube-style)
const SPEED_STEPS = [0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2] as const
interface DemoState {
phase: string
constantId: string | null
revealProgress: number
}
interface Narration {
isNarrating: MutableRefObject<boolean>
playbackSpeedRef: MutableRefObject<number>
stop: () => void
resume: (constantId: string) => void
}
interface UseDemoKeyboardShortcutsOptions {
demoStateRef: MutableRefObject<DemoState>
narration: Narration
setRevealProgress: (p: number) => void
handlePlayPauseClick: () => void
audioManager: { configure: (opts: { playbackRate: number }) => void }
refineMode: boolean
refineTaskActive: boolean
setRefineMode: (v: boolean | ((prev: boolean) => boolean)) => void
setRefineRange: (v: { start: number; end: number } | null) => void
refineStartRef: MutableRefObject<number | null>
isVisualDebugEnabled: boolean
isDevelopment: boolean
}
export function useDemoKeyboardShortcuts({
demoStateRef,
narration,
setRevealProgress,
handlePlayPauseClick,
audioManager,
refineMode,
refineTaskActive,
setRefineMode,
setRefineRange,
refineStartRef,
isVisualDebugEnabled,
isDevelopment,
}: UseDemoKeyboardShortcutsOptions) {
const [showShortcuts, setShowShortcuts] = useState(false)
const [displaySpeed, setDisplaySpeed] = useState(1)
const speedFadeTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
const [showSpeedBadge, setShowSpeedBadge] = useState(false)
useEffect(() => {
const handler = (e: KeyboardEvent) => {
// Escape: close shortcuts, or exit refine mode
if (e.key === 'Escape') {
if (refineMode) {
if (refineTaskActive) return
setRefineMode(false)
setRefineRange(null)
refineStartRef.current = null
return
}
setShowShortcuts(false)
return
}
const ds = demoStateRef.current
if (ds.phase === 'idle') return
const tag = (e.target as HTMLElement)?.tagName
if (tag === 'INPUT' || tag === 'TEXTAREA' || tag === 'SELECT') return
// 'r' toggles refine mode (dev-only)
if ((e.key === 'r' || e.key === 'R') && isDevelopment && isVisualDebugEnabled) {
if (refineTaskActive) return
setRefineMode((prev: boolean) => {
if (!prev) {
narration.stop()
return true
} else {
setRefineRange(null)
refineStartRef.current = null
return false
}
})
return
}
// ? toggles shortcuts overlay
if (e.key === '?') {
setShowShortcuts((prev) => !prev)
return
}
// < / > adjust playback speed
if (e.key === '<' || e.key === '>') {
e.preventDefault()
const current = narration.playbackSpeedRef.current
const idx = SPEED_STEPS.findIndex((s) => s >= current)
const newIdx =
e.key === '>'
? Math.min(SPEED_STEPS.length - 1, (idx === -1 ? SPEED_STEPS.length - 1 : idx) + 1)
: Math.max(0, (idx === -1 ? 0 : idx) - 1)
const newSpeed = SPEED_STEPS[newIdx]
narration.playbackSpeedRef.current = newSpeed
audioManager.configure({ playbackRate: newSpeed })
setDisplaySpeed(newSpeed)
setShowSpeedBadge(true)
if (speedFadeTimerRef.current) clearTimeout(speedFadeTimerRef.current)
speedFadeTimerRef.current = setTimeout(() => setShowSpeedBadge(false), 1500)
return
}
setShowShortcuts(false)
if (e.key === ' ') {
e.preventDefault()
handlePlayPauseClick()
return
}
let delta = 0
switch (e.key) {
case 'ArrowRight':
delta = e.shiftKey ? 0.02 : 0.05
break
case 'ArrowLeft':
delta = e.shiftKey ? -0.02 : -0.05
break
case 'l':
case 'L':
delta = 0.1
break
case 'j':
case 'J':
delta = -0.1
break
case 'Home':
delta = -Infinity
break
case 'End':
delta = Infinity
break
default:
return
}
e.preventDefault()
const wasPlaying = narration.isNarrating.current
narration.stop()
const target =
delta === -Infinity
? 0
: delta === Infinity
? 1
: Math.max(0, Math.min(1, ds.revealProgress + delta))
setRevealProgress(target)
if (wasPlaying && ds.constantId && target < 1) {
requestAnimationFrame(() => narration.resume(ds.constantId!))
}
}
window.addEventListener('keydown', handler)
return () => window.removeEventListener('keydown', handler)
}, [
demoStateRef,
handlePlayPauseClick,
narration,
setRevealProgress,
audioManager,
refineMode,
refineTaskActive,
setRefineMode,
setRefineRange,
refineStartRef,
isVisualDebugEnabled,
isDevelopment,
])
return {
showShortcuts,
setShowShortcuts,
displaySpeed,
setDisplaySpeed,
showSpeedBadge,
setShowSpeedBadge,
speedFadeTimerRef,
}
}
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