Deslizador de rango de dos tiradores

"use client";

import { useId, useState, type CSSProperties } from "react";

/** Deslizador de rango con dos tiradores, minimalista. Son dos input range nativos superpuestos: teclado, foco y lectores de pantalla funcionan sin código extra. React + TypeScript, sin dependencias. */
export type DeslizadorRangoProps = {
  label?: string;
  min?: number;
  max?: number;
  step?: number;
  defaultValue?: [number, number];
  format?: (value: number) => string;
  onChange?: (value: [number, number]) => void;
  className?: string;
  style?: CSSProperties;
};

const CSS = `
.gcdrg-root { box-sizing: border-box; display: block; width: 100%; max-width: 380px; color: var(--gcdrg-fg, #111); font: 500 14px/1.3 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif; }
.gcdrg-root *, .gcdrg-root *::before, .gcdrg-root *::after { box-sizing: border-box; }
@media (prefers-reduced-motion: reduce) { .gcdrg-root *, .gcdrg-root *::before, .gcdrg-root *::after { transition-duration: .01ms !important; } }
.gcdrg-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 14px; }
.gcdrg-values { font-size: 20px; font-weight: 600; font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.gcdrg-wrap { position: relative; height: 28px; }
.gcdrg-rail, .gcdrg-fill { position: absolute; top: 13px; height: 2px; border-radius: 2px; }
.gcdrg-rail { left: 0; right: 0; background: var(--gcdrg-rail, #d6d6d2); }
.gcdrg-fill { background: var(--gcdrg-fg, #111); }
.gcdrg-input { position: absolute; inset: 0; width: 100%; height: 28px; margin: 0; background: none; pointer-events: none; -webkit-appearance: none; appearance: none; outline: 0; }
.gcdrg-input::-webkit-slider-runnable-track { background: none; height: 28px; }
.gcdrg-input::-moz-range-track { background: none; }
.gcdrg-input::-webkit-slider-thumb { -webkit-appearance: none; pointer-events: auto; width: 22px; height: 22px; margin-top: 3px; border-radius: 50%; border: 2px solid var(--gcdrg-fg, #111); background: #fff; cursor: grab; transition: transform .15s cubic-bezier(.16, 1, .3, 1); }
.gcdrg-input::-moz-range-thumb { pointer-events: auto; width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--gcdrg-fg, #111); background: #fff; cursor: grab; }
.gcdrg-input:hover::-webkit-slider-thumb { transform: scale(1.12); }
.gcdrg-input:active::-webkit-slider-thumb { cursor: grabbing; transform: scale(.96); }
.gcdrg-input:focus-visible::-webkit-slider-thumb { outline: 3px solid #2563eb; outline-offset: 3px; }
.gcdrg-input:focus-visible::-moz-range-thumb { outline: 3px solid #2563eb; outline-offset: 3px; }`;

export function DeslizadorRango({ label = "Presupuesto mensual", min = 0, max = 1000, step = 10, defaultValue = [200, 700], format = (value) => `$${value}`, onChange, className = "", style }: DeslizadorRangoProps) {
  const id = useId();
  const [[lo, hi], setRange] = useState<[number, number]>(defaultValue);
  const pct = (value: number) => ((value - min) / (max - min)) * 100;

  function update(next: [number, number]) {
    setRange(next);
    onChange?.(next);
  }

  return (
    <div className={`gcdrg-root ${className}`} style={style} role="group" aria-labelledby={`${id}-l`}>
      <style>{CSS}</style>
      <div className="gcdrg-head">
        <span id={`${id}-l`}>{label}</span>
        <span className="gcdrg-values" aria-live="polite">
          {format(lo)} – {format(hi)}
        </span>
      </div>
      <div className="gcdrg-wrap">
        <span className="gcdrg-rail" />
        <span className="gcdrg-fill" style={{ left: `${pct(lo)}%`, right: `${100 - pct(hi)}%` }} />
        <input className="gcdrg-input" type="range" aria-label={`${label}, mínimo`} min={min} max={max} step={step} value={lo} onChange={(event) => update([Math.min(Number(event.target.value), hi - step), hi])} />
        <input className="gcdrg-input" type="range" aria-label={`${label}, máximo`} min={min} max={max} step={step} value={hi} onChange={(event) => update([lo, Math.max(Number(event.target.value), lo + step)])} />
      </div>
    </div>
  );
}

npx shadcn@latest add https://www.gassierconsulting.com/r/deslizador-rango

import { DeslizadorRango } from "./deslizador-rango";

export default function Ejemplo() {
  return <DeslizadorRango label="Ejemplo" />;
}