Brooklyn Nicholson
53 lines
1.6 KiB
TypeScript
53 lines
1.6 KiB
TypeScript
import { motion, useSpring, useTransform } from 'motion/react'
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import { useEffect } from 'react'
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import { cn } from '@/lib/utils'
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// Snappy spring — fast transitions per the design.
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const SPRING = { stiffness: 320, damping: 30, mass: 0.5 } as const
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// A single integer that springs to its value via Motion (renders the motion
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// value straight to the DOM, no per-frame React re-render). It initialises AT
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// its value, so mounting/navigating shows it instantly — only a real change to
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// the number (a live edit) springs it up/down. Switching threads in the same
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// worktree (same numbers) therefore doesn't animate.
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function AnimatedInt({ value }: { value: number }) {
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const spring = useSpring(value, SPRING)
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const text = useTransform(spring, latest => Math.round(latest).toString())
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useEffect(() => {
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spring.set(value)
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}, [value, spring])
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return <motion.span>{text}</motion.span>
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}
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interface DiffCountProps {
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added: number
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removed: number
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className?: string
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}
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/** Animated `+A −B` line-count, green/red via the top-level theme vars. Each
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* number springs up/down via Motion (0 → value on first mount). */
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export function DiffCount({ added, removed, className }: DiffCountProps) {
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if (!added && !removed) {
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return null
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}
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return (
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<span className={cn('flex shrink-0 items-center gap-1 tabular-nums', className)}>
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{added > 0 && (
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<span className="text-(--ui-green)">
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+<AnimatedInt value={added} />
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</span>
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)}
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{removed > 0 && (
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<span className="text-(--ui-red)">
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−<AnimatedInt value={removed} />
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</span>
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)}
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</span>
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)
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}
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