View Transitions API

"use client";

import { useState, useCallback } from "react";
import styles from "./styles.module.css";

const PAGES = [
  { key: "home", label: "Home", bg: "#f5f5f5", color: "#1a1a1a" },
  { key: "about", label: "About", bg: "#0d0d0d", color: "#ffffff" },
  { key: "work", label: "Work", bg: "#1a1f2e", color: "#ffffff" },
];

export default function ViewTransitionsApi() {
  const [pageIndex, setPageIndex] = useState(0);

  const navigate = useCallback((nextIndex) => {
    if (nextIndex === pageIndex) return;

    if (!document.startViewTransition) {
      setPageIndex(nextIndex);
      return;
    }

    document.startViewTransition(() => {
      setPageIndex(nextIndex);
    });
  }, [pageIndex]);

  const page = PAGES[pageIndex];

  return (
    <div className={styles.demo}>
      <div
        className={styles.page}
        style={{ background: page.bg, color: page.color }}
      >
        <h2 className={styles.pageTitle}>{page.label}</h2>
        <p className={styles.hint}>Uses the native View Transitions API</p>
      </div>

      <div className={styles.nav}>
        {PAGES.map((p, i) => (
          <button
            key={p.key}
            className={`${styles.navBtn} ${i === pageIndex ? styles.active : ""}`}
            onClick={() => navigate(i)}
          >
            {p.label}
          </button>
        ))}
      </div>
    </div>
  );
}