Range Slider Bubble Slider

1"use client";
2// beui.dev/components/motion/range-slider
3 
4import {
5  AnimatePresence,
6  motion,
7  useMotionTemplate,
8  useMotionValue,
9  useReducedMotion,
10  useSpring,
11  useTransform,
12  useVelocity,
13} from "motion/react";
14import { useEffect } from "react";
15 
16import { SPRING_GLIDE, SPRING_PANEL, SPRING_PRESS } from "@/lib/ease";
17import { type SliderOptions, useSlider } from "@/lib/hooks/use-slider";
18import { cn } from "@/lib/utils";
19 
20// Loose enough that the bubble keeps leaning a beat after the pointer stops.
21const SPRING_TILT = { stiffness: 260, damping: 22, mass: 0.4 } as const;
22/** Drag speed (px/s of track percent) that maxes out lean and squash. */
23const FULL_TILT = 320;
24 
25export interface BubbleSliderProps extends SliderOptions {
26  /** Formats the value shown in the bubble. */
27  format?: (value: number) => string;
28  className?: string;
29}
30 
31/**
32 * Slider with a value bubble that pops out of the thumb on grab and reacts to
33 * how fast you drag: it leans into the direction of travel and squashes along
34 * the way, then settles upright when you let go.
35 */
36export function BubbleSlider({ format, className, ...options }: BubbleSliderProps) {
37  const reduce = useReducedMotion();
38  // A bare number needs no valueText — it would only repeat aria-valuenow.
39  const { percent, current, dragging, trackProps, sliderProps } = useSlider({
40    ...options,
41    formatValueText: options.formatValueText ?? format,
42  });
43  // The value is already snapped to the step — rounding here would only make
44  // the bubble disagree with aria-valuenow on a fractional scale.
45  const readout = format ? format(current) : current;
46 
47  const target = useMotionValue(percent);
48  useEffect(() => {
49    target.set(percent);
50  }, [percent, target]);
51  const smooth = useSpring(target, SPRING_GLIDE);
52  const pos = reduce ? target : smooth;
53  const left = useMotionTemplate`${pos}%`;
54 
55  // One spring drives the whole reaction: lean is signed, squash reads its
56  // magnitude. Two springs off the same velocity would just run twice.
57  const velocity = useVelocity(pos);
58  const lean = useSpring(
59    useTransform(velocity, [-FULL_TILT, 0, FULL_TILT], [1, 0, -1], { clamp: true }),
60    SPRING_TILT,
61  );
62  const tilt = useTransform(lean, (v) => v * 16);
63  const squash = useTransform(lean, (v) => 1 + Math.abs(v) * 0.18);
64  const stretch = useTransform(lean, (v) => 1 - Math.abs(v) * 0.12);
65 
66  return (
67    <div
68      className={cn(
69// … truncated