infinity-track

1import { cn } from "@/lib/utils";
2 
3const INFINITY_TRACK_BLOCKS = ["█", "▓", "▒"] as const;
4 
5type InfinityTrackProps = React.ComponentProps<"span"> & {
6  blocks?: readonly string[];
7  track?: string;
8};
9 
10function InfinityTrack({
11  className,
12  blocks = INFINITY_TRACK_BLOCKS,
13  track = "░",
14  ...props
15}: InfinityTrackProps) {
16  const glyphs = INFINITY_TRACK_BLOCKS.map(
17    (_, index) => blocks[index] ?? INFINITY_TRACK_BLOCKS[index],
18  );
19  const gridCells = Array.from({ length: 45 }, (_, index) => {
20    const row = Math.floor(index / 9);
21    const col = index % 9;
22 
23    return row === 0 || row === 4 || col === 0 || col === 4 || col === 8
24      ? track
25      : " ";
26  });
27 
28  return (
29    <>
30      <style>{`
31        @keyframes loading-ui-infinity-track {
32          0%,
33          100% {
34            transform: translate(4ch, 0);
35          }
36 
37          12.5% {
38            transform: translate(0, 0);
39          }
40 
41          25% {
42            transform: translate(0, 4ch);
43          }
44 
45          37.5% {
46            transform: translate(4ch, 4ch);
47          }
48 
49          50% {
50            transform: translate(4ch, 0);
51          }
52 
53          62.5% {
54            transform: translate(8ch, 0);
55          }
56 
57          75% {
58            transform: translate(8ch, 4ch);
59          }
60 
61          87.5% {
62            transform: translate(4ch, 4ch);
63          }
64        }
65      `}</style>
66      <span
67        role="status"
68        className={cn(
69          "relative inline-flex h-[5ch] w-[9ch] overflow-hidden font-mono text-xl leading-none text-current select-none",
70          className,
71        )}
72        {...props}
73      >
74        <span
75          aria-hidden="true"
76          className="pointer-events-none absolute inset-0 grid grid-cols-9 grid-rows-5"
77        >
78          {gridCells.map((glyph, index) => (
79            <span
80              key={index}
81              className="flex h-[1ch] w-[1ch] items-center justify-center"
82            >
83              {glyph}
84            </span>
85          ))}
86        </span>
87        {glyphs.map((glyph, index) => (
88          <span
89            key={`${glyph}-${index}`}
90            aria-hidden="true"
91            className={cn(
92              "pointer-events-none absolute top-0 left-0 flex h-[1ch] w-[1ch] items-center justify-center",
93              ["z-30", "z-20", "z-10"][index],
94            )}
95            style={{
96              animation:
97                "loading-ui-infinity-track var(--duration, 3.2s) linear infinite",
98// … truncated