Custom Cursor

1/** biome-ignore-all lint/a11y/noNoninteractiveElementInteractions: Cursor targets use hover-only affordances. */
2/** biome-ignore-all lint/a11y/noStaticElementInteractions: Cursor targets are decorative hover zones. */
3 
4"use client";
5 
6import { cn } from "@/lib/utils";
7import { cva, type VariantProps } from "class-variance-authority";
8import {
9  motion,
10  type SpringOptions,
11  useMotionValue,
12  useReducedMotion,
13  useSpring,
14} from "motion/react";
15import {
16  type ComponentProps,
17  type ComponentPropsWithoutRef,
18  createContext,
19  type ReactNode,
20  useContext,
21  useEffect,
22  useMemo,
23  useState,
24} from "react";
25 
26type MotionDivAnimate = NonNullable<
27  ComponentProps<typeof motion.div>["animate"]
28>;
29 
30const DEFAULT_CURSOR_COLOR = "#ff4c24";
31 
32const CURSOR_EASE = [0.625, 0.05, 0, 1] as const;
33 
34const customCursorVariants = cva("relative select-none", {
35  variants: {
36    layout: {
37      default: "",
38      demo: "flex min-h-72 items-center justify-center",
39    },
40  },
41  defaultVariants: {
42    layout: "default",
43  },
44});
45 
46const customCursorTargetVariants = cva(
47  "flex items-center justify-center text-foreground transition-opacity hover:opacity-80",
48  {
49    variants: {
50      size: {
51        sm: "size-10",
52        md: "size-14",
53        lg: "size-16",
54      },
55    },
56    defaultVariants: {
57      size: "md",
58    },
59  }
60);
61 
62interface CustomCursorContextValue {
63  setIsHovering: (isHovering: boolean) => void;
64}
65 
66const CustomCursorContext = createContext<CustomCursorContextValue | null>(
67  null
68);
69 
70function useCustomCursorContext() {
71  const context = useContext(CustomCursorContext);
72 
73  if (!context) {
74    throw new Error(
75      "CustomCursorTarget must be used within a CustomCursor provider."
76    );
77  }
78 
79  return context;
80}
81 
82function hexToRgba(hex: string, alpha: number) {
83  const normalized = hex.replace("#", "");
84 
85  if (normalized.length !== 6) {
86    return `rgba(255, 76, 36, ${alpha})`;
87  }
88 
89  const red = Number.parseInt(normalized.slice(0, 2), 16);
90  const green = Number.parseInt(normalized.slice(2, 4), 16);
91  const blue = Number.parseInt(normalized.slice(4, 6), 16);
92 
93  return `rgba(${red}, ${green}, ${blue}, ${alpha})`;
94}
95 
96function resolveCursorAppearance(
97  isHovering: boolean,
98  color: string
99): MotionDivAnimate {
100  if (!isHovering) {
101    return {
102      width: 16,
103      height: 16,
104      borderRadius: 9999,
105      backgroundColor: color,
106      borderColor: color,
107      borderWidth: 1,
108    };
109  }
110 
111  return {
112    width: 48,
113    height: 48,
114    borderRadius: 9999,
115// … truncated