69 lines
2.4 KiB
TypeScript
69 lines
2.4 KiB
TypeScript
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import { cn } from "@/lib/utils";
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/**
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* THE BRAILLE SPINNER (owner, minimal-color round): the one working-state
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* indicator, in the terminal's own glyph language. Pure function + CSS —
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* no JS frame timer, no React re-render per frame; each frame is a tiny
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* <g> whose opacity is compositor-animated, so the cost is below the old
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* breathing dot's (which animated opacity AND transform).
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*
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* Geometry: the classic cli-spinner sequence (⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏, 10 frames,
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* 80ms each — 800ms cycle) as EXACT dot bitmaps in a 2×4 braille cell
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* (dots 1-3 = left column, 4-6 = right). One shared keyframes (globals.css
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* .braille-frame) holds each frame visible for its 10% slice; frames
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* stagger via positive animation-delay, so frame 0 leads from first paint.
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*
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* Static fallback (SSR pre-hydrate, prefers-reduced-motion, print): frame
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* 0 (⠋) shows — a legible glyph, not a blank. Motion is honest here: it
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* exists only while a turn is in flight and vanishes the moment it ends.
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*/
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const FRAMES: ReadonlyArray<{ dots: ReadonlyArray<readonly [number, number]> }> = [
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{ dots: [[1, 1], [1, 3], [3, 1]] },
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{ dots: [[1, 1], [3, 1], [3, 3]] },
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{ dots: [[1, 1], [3, 1], [3, 3], [3, 5]] },
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{ dots: [[3, 1], [3, 3], [3, 5]] },
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{ dots: [[1, 5], [3, 1], [3, 3], [3, 5]] },
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{ dots: [[1, 5], [3, 3], [3, 5]] },
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{ dots: [[1, 3], [1, 5], [3, 5]] },
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{ dots: [[1, 1], [1, 3], [1, 5], [3, 5]] },
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{ dots: [[1, 1], [1, 3], [1, 5]] },
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{ dots: [[1, 1], [1, 3], [1, 5], [3, 1]] },
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];
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/** The animation constants (mirrors globals.css .braille-frame). */
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export const SPINNER_FRAME_MS = 80;
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export const SPINNER_FRAMES = FRAMES.length;
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export function BrailleSpinner({
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className,
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label = "Teacher is working",
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}: {
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/** Sizing/position classes; height drives the scale (width is the cell's 1:2 aspect). */
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className?: string;
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/** The accessible name of the state this spinner announces. */
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label?: string;
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}) {
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return (
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<svg
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viewBox="0 0 4 8"
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data-testid="braille-spinner"
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role="status"
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aria-label={label}
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className={cn("h-3 w-auto shrink-0 text-foreground", className)}
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>
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{FRAMES.map((frame, k) => (
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<g
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key={k}
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className="braille-frame"
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data-frame={k}
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style={{ animationDelay: `${k * SPINNER_FRAME_MS}ms` }}
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>
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{frame.dots.map(([cx, cy]) => (
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<circle key={`${cx}-${cy}`} cx={cx} cy={cy} r={0.8} className="fill-current" />
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))}
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</g>
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))}
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</svg>
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);
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}
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