PixPick/scroll.html at master · CoffeeDev7/PixPick · GitHub

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <title>Scroll Restore Demo · Boards</title>
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <style>
    :root {
      --header-h: 64px;
      --bg1: #0ea5a5;
      --bg2: #f1f5f9;
      --card: #ffffff;
      --ink: #0f172a;
      --muted: #475569;
    }
    * { box-sizing: border-box; }
    html, body { margin: 0; padding: 0; }
    body {
      font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
      color: var(--ink);
      background: var(--bg2);
    }
    /* fixed header to test offset behavior */
    .header {
      position: fixed; inset: 0 0 auto 0; height: var(--header-h);
      display: flex; align-items: center; gap: 12px;
      padding: 0 16px; background: var(--bg1); color: white;
      z-index: 10; box-shadow: 0 2px 6px rgba(0,0,0,.25);
    }
    .header a { color: white; text-decoration: none; font-weight: 600; }
    .header .spacer { flex: 1; }
    .wrap {
      padding: 16px;
      margin-top: var(--header-h);
      transition: margin-top .2s;
    }
    .hero {
      background: linear-gradient(90deg, #a7f3d0, #bae6fd);
      border-radius: 16px; padding: 24px; margin-bottom: 24px;
    }
    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 16px;
    }
    .card {
      background: var(--card); border-radius: 14px; padding: 16px;
      box-shadow: 0 2px 8px rgba(0,0,0,.08);
    }
    .card h3 { margin: 0 0 8px 0; font-size: 16px; }
    .card p  { margin: 0; color: var(--muted); font-size: 13px; }
    .board-link {
      display: block; text-decoration: none; color: inherit;
    }
    .chiprow { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
    .chip {
      font-size: 12px; padding: 4px 8px; border-radius: 999px;
      background: #f1f5f9; border: 1px solid #e2e8f0; color: #334155;
    }
    .section {
      margin: 24px 0;
    }
    .tall-block {
      height: 520px;
      border-radius: 14px;
      background: repeating-linear-gradient(
        45deg,
        #eef2ff, #eef2ff 14px,
        #e0e7ff 14px, #e0e7ff 28px
      );
      display: grid; place-items: center;
      color: #3730a3; font-weight: 700;
      box-shadow: inset 0 0 0 1px rgba(0,0,0,.06);
    }

    /* Detail page */
    .detail {
      max-width: 980px; margin: 0 auto;
    }
    .detail h1 { margin: 0 0 12px 0; }
    .ph-img {
      width: 100%; height: 280px; border-radius: 12px; object-fit: cover; display: block;
      background: #e2e8f0;
    }
    .para {
      line-height: 1.7; color: #334155; margin: 12px 0;
    }
    .back {
      display: inline-flex; align-items: center; gap: 6px;
      text-decoration: none; background: white; padding: 8px 12px; border-radius: 10px;
      box-shadow: 0 1px 4px rgba(0,0,0,.08); border: 1px solid #e2e8f0; color: #0f172a;
    }
    .muted {
      color: #64748b; font-size: 13px;
    }
    .rule { height: 1px; background: #e2e8f0; margin: 16px 0; }
  </style>
</head>
<body>
  <div class="header">
    <a href="/" data-internal>PixPick</a>
    <div class="spacer"></div>
    <a href="/" data-internal>Boards</a>
  </div>

  <main id="app" class="wrap">
    <!-- Content injected by tiny router -->
  </main>

  <script>
    // ===== Forceful Global Scroll Restore (vanilla) =====
    (function() {
      const HEADER_OFFSET = parseInt(getComputedStyle(document.documentElement).getPropertyValue('--header-h')) || 64;
      const SELECTORS = ["#app", ".wrap", ".grid", ".detail"]; // common containers; window is primary

      const keyFor = (path, search) => `pixpick:scroll:${path}${search||""}`;

      const readSnapshot = (k) => {
        const raw = sessionStorage.getItem(k);
        if (!raw) return null;
        try { return JSON.parse(raw); } catch { return null; }
      };

      const collectSnapshot = () => {
        const snap = { window: window.scrollY || 0, ts: Date.now() };
        for (const sel of SELECTORS) {
          const el = document.querySelector(sel);
          snap[sel] = el ? (el.scrollTop || 0) : 0;
        }
        return snap;
      };

      const forceWrite = (snap) => {
        try { window.scrollTo(0, Math.max(0, (snap.window||0) - HEADER_OFFSET)); } catch {}
        for (const sel of SELECTORS) {
          const el = document.querySelector(sel);
          if (!el) continue;
          const v = Math.max(0, (snap[sel] || 0) - HEADER_OFFSET);
          el.scrollTop = v;
        }
      };

      const saveNow = () => {
        const { pathname, search } = window.location;
        const k = keyFor(pathname, search);
        const snap = collectSnapshot();
        sessionStorage.setItem(k, JSON.stringify(snap));
        // console
        console.log("[pixpick] saved", k, snap);
      };

      const aggressiveRestore = (timeoutMs = 1500) => {
        const { pathname, search } = window.location;
        const k = keyFor(pathname, search);
        const snap = readSnapshot(k);
        if (!snap) {
          console.log("[pixpick] no snapshot to restore for", k);
          return;
        }
        console.log("[pixpick] aggressive restore start for", k, snap);

        // One immediate write
        forceWrite(snap);

        // Re-apply for a short window (handles late images/layout shifts)
        const start = Date.now();
        const int = setInterval(() => {
          forceWrite(snap);
          if (Date.now() - start > timeoutMs) {
            clearInterval(int);
            console.log("[pixpick] aggressive restore finished for", k);
          }
        }, 120);

        // Also apply on initial next paint
        requestAnimationFrame(() => forceWrite(snap));
      };

      // manual mode (so browser doesn't fight us)
      try { if ('scrollRestoration' in history) history.scrollRestoration = 'manual'; } catch {}

      // Save often while user scrolls (rAF throttle)
      let raf = 0;
      window.addEventListener('scroll', () => {
        if (raf) return;
        raf = requestAnimationFrame(() => { raf = 0; saveNow(); });
      }, { passive: true, capture: true });

      // Save on interactions & before unload
      ['mousedown','touchstart','keydown'].forEach(evt =>
        window.addEventListener(evt, saveNow, { capture: true })
      );
      window.addEventListener('beforeunload', saveNow);
      document.addEventListener('visibilitychange', () => {
        if (document.visibilityState === 'hidden') saveNow();
      });

      // Restore on back/forward
      window.addEventListener('popstate', () => {
        console.log("[pixpick] popstate -> trying restore");
        // Content will re-render via router; give it a tick then restore
        setTimeout(() => aggressiveRestore(), 30);
      });

      // Expose to router to call after render
      window.__restoreScrollAggressively = () => aggressiveRestore();
      window.__saveScrollNow = () => saveNow();
    })();

    // ===== Tiny Client-side Router (intercepts <a data-internal>) =====
    const app = document.getElementById('app');

    function lorem(n=1) {
      const t = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent eget dapibus neque. Integer tempus, sapien non ultrices tincidunt, urna nunc interdum neque, quis vehicula felis lectus eget risus.";
      return Array.from({length:n}).map(()=>t).join(" ");
    }

    // Home (boards list) — lots of vertical content
    function renderHome() {
      const blocks = Array.from({ length: 8 }, (_, i) => `
        <section class="section">
          <div class="hero">
            <h2>Featured Section ${i+1}</h2>
            <p class="muted">${lorem(2)}</p>
          </div>
          <div class="grid">
            ${Array.from({ length: 12 }, (_, j) => {
              const id = `b${i+1}-${j+1}-${Math.random().toString(36).slice(2,7)}`;
              const qs = `?view=grid&sort=recent&n=${i}-${j}`;
              return `
                <a class="board-link" href="/board/${id}${qs}" data-internal>
                  <article class="card">
                    <h3>Board ${i+1}.${j+1}</h3>
                    <p>${lorem()}</p>
                    <div class="chiprow">
                      <span class="chip">grid</span>
                      <span class="chip">recent</span>
                      <span class="chip">${id.slice(0,6)}</span>
                    </div>
                  </article>
                </a>
              `;
            }).join("")}
          </div>
        </section>
        <div class="tall-block">Tall filler ${i+1}</div>
      `).join("");

      app.innerHTML = `
        <div class="section">
          <h1>Boards</h1>
          <p class="muted">Scroll down, click any board, then press browser Back — your position should be restored.</p>
        </div>
        ${blocks}
      `;
    }

    // Board detail
    function renderBoard(id, params) {
      const title = `Board ${id}`;
      app.innerHTML = `
        <div class="detail">
          <a class="back" href="/" data-internal>&larr; Back to Boards</a>
          <div class="rule"></div>
          <h1>${title}</h1>
          <p class="muted">Params: ${new URLSearchParams(params).toString() || "(none)"}</p>
          <img class="ph-img" alt="" src="https://picsum.photos/seed/${encodeURIComponent(id)}/1600/900" />
          ${Array.from({length: 30}, (_, i) => `<p class="para"><strong>Paragraph ${i+1}.</strong> ${lorem(2)}</p>`).join("")}
        </div>
      `;
    }

    function routeTo(pathname, search) {
      // simple matcher: /  or  /board/:id
      if (pathname === "/") {
        renderHome();
      } else {
        const m = pathname.match(/^\/board\/([^/]+)$/);
        if (m) {
          renderBoard(m[1], search);
        } else {
          app.innerHTML = `<h1>Not found</h1><p><a href="/" data-internal>Go Home</a></p>`;
        }
      }
      // after painting content, attempt scroll restore
      requestAnimationFrame(() => {
        if (window.__restoreScrollAggressively) window.__restoreScrollAggressively();
      });
    }

    // initial render
    routeTo(location.pathname, location.search);

    // intercept internal links
    document.addEventListener('click', (e) => {
      const a = e.target.closest && e.target.closest('a[data-internal]');
      if (!a) return;
      const url = new URL(a.href);
      if (url.origin !== location.origin) return;
      e.preventDefault();

      // Save where we are (home scroll) before navigating
      if (window.__saveScrollNow) window.__saveScrollNow();

      history.pushState({}, "", url.pathname + url.search);
      routeTo(url.pathname, url.search);
    });

    // on hard refresh in Live Server, keep SPA alive; popstate is handled above
    window.addEventListener('popstate', () => {
      routeTo(location.pathname, location.search);
    });
  </script>
</body>
</html>