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interface ResizeHandleProps {
onResize: (delta: number) => void
}
export function ResizeHandle({ onResize }: ResizeHandleProps) {
const isDragging = useRef(false)
const lastX = useRef(0)
const pendingDelta = useRef(0)
const rafId = useRef(0)
const handleMouseDown = useCallback(
(e: React.MouseEvent) => {
e.preventDefault()
isDragging.current = true
lastX.current = e.clientX
pendingDelta.current = 0
document.body.style.cursor = 'col-resize'
document.body.style.userSelect = 'none'
},
[],
)
useEffect(() => {
const handleMouseMove = (e: MouseEvent) => {
if (!isDragging.current) return
pendingDelta.current += e.clientX - lastX.current
lastX.current = e.clientX
if (!rafId.current) {
rafId.current = requestAnimationFrame(() => {
if (pendingDelta.current !== 0) {
onResize(pendingDelta.current)
pendingDelta.current = 0
}
rafId.current = 0
})
}
}
const handleMouseUp = () => {
if (isDragging.current) {
isDragging.current = false
document.body.style.cursor = ''
document.body.style.userSelect = ''
// Flush any pending delta
if (rafId.current) {
cancelAnimationFrame(rafId.current)
rafId.current = 0
}
if (pendingDelta.current !== 0) {
onResize(pendingDelta.current)
pendingDelta.current = 0
}
}
}
document.addEventListener('mousemove', handleMouseMove)
document.addEventListener('mouseup', handleMouseUp)
return () => {
document.removeEventListener('mousemove', handleMouseMove)
document.removeEventListener('mouseup', handleMouseUp)
Iif (rafId.current) cancelAnimationFrame(rafId.current)
}
}, [onResize])
return (
<div
className="-ml-1 w-1 shrink-0 cursor-col-resize bg-transparent transition-colors hover:bg-[var(--border)]"
onMouseDown={handleMouseDown}
/>
)
}
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