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zmo-cli/packages/ui/src/components/text-shimmer.tsx
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import { createEffect, createMemo, createSignal, onCleanup, type ValidComponent } from "solid-js"
import { Dynamic } from "solid-js/web"
export const TextShimmer = <T extends ValidComponent = "span">(props: {
text: string
class?: string
as?: T
active?: boolean
offset?: number
}) => {
const text = createMemo(() => props.text ?? "")
const active = createMemo(() => props.active ?? true)
const offset = createMemo(() => props.offset ?? 0)
const [run, setRun] = createSignal(active())
const swap = 220
let timer: ReturnType<typeof setTimeout> | undefined
createEffect(() => {
if (timer) {
clearTimeout(timer)
timer = undefined
}
if (active()) {
setRun(true)
return
}
timer = setTimeout(() => {
timer = undefined
setRun(false)
}, swap)
})
onCleanup(() => {
if (!timer) return
clearTimeout(timer)
})
const len = createMemo(() => Math.max(text().length, 1))
const shimmerSize = createMemo(() => Math.max(300, Math.round(200 + 1400 / len())))
// duration = len × (size - 1) / velocity → uniform perceived sweep speed
const VELOCITY = 0.01375 // ch per ms, ~10% faster than original 0.0125 baseline
const shimmerDuration = createMemo(() => {
const s = shimmerSize() / 100
return Math.max(1000, Math.min(2500, Math.round((len() * (s - 1)) / VELOCITY)))
})
return (
<Dynamic
component={props.as ?? "span"}
data-component="text-shimmer"
data-active={active() ? "true" : "false"}
class={props.class}
aria-label={text()}
style={{
"--text-shimmer-swap": `${swap}ms`,
"--text-shimmer-index": `${offset()}`,
"--text-shimmer-size": `${shimmerSize()}%`,
"--text-shimmer-duration": `${shimmerDuration()}ms`,
}}
>
<span data-slot="text-shimmer-char">
<span data-slot="text-shimmer-char-base" aria-hidden="true">
{text()}
</span>
<span data-slot="text-shimmer-char-shimmer" data-run={run() ? "true" : "false"} aria-hidden="true">
{text()}
</span>
</span>
</Dynamic>
)
}