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Skald-Circle/web/mobile.html
T
Daniele 71e1a26b08
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fix(ui): render PDFs with pdf.js instead of an iframe
On iOS the file viewer showed only the first page of a PDF, with no way
to scroll to the rest — the document had to be downloaded and opened in
another app. The cause was not ours: WebKit refuses to mount its PDF
viewer inside an <iframe>/<object>/<embed> and paints a static first-page
thumbnail instead. That hits Safari on iOS and every WKWebView, so the
native shell too. The full viewer only exists for a top-level navigation.

The desktop browsers do mount a viewer, but each mounts its own — Chrome's
toolbar, Safari's page-index sidebar — so the same document also looked
different on every machine.

Both are answered by drawing the pages ourselves. New <pdf-view>
(web/components/shared/pdf-view.js) renders a continuous scroll of canvas
pages on the vendored pdf.js, with a zoom control and a page counter, and
replaces the iframe for both native .pdf files and server-compiled LaTeX.

Three properties are load-bearing:

- pdf.js is imported lazily (~450 KB + a 1.2 MB worker), so a session that
  never opens a PDF never pays for it.
- Canvases are created and destroyed as pages scroll. iOS caps the total
  canvas backing store a page may hold and silently blanks canvases past
  it, so an eager render would come out empty on exactly the platform this
  was written for. Off-screen pages keep only a correctly-sized box, which
  is also what keeps the scrollbar honest.
- The text layer (selection, in-page find) is best-effort: it is
  transparent DOM over the pixels, so its failures are swallowed rather
  than surfaced.

Vendored from pdfjs-dist 6.2.108: pdf.min.mjs, pdf.worker.min.mjs, the
standard-font data (needed by PDFs that reference Helvetica/Times without
embedding them) and the .textLayer block of pdf_viewer.css. CJK cmaps are
deliberately left out. pdf.js 6 needs Safari/iOS 17.4+.

Verified in headless Chromium against both a synthetic 12-page PDF using
non-embedded Helvetica and a real 14-page paper with embedded fonts and
figures: all pages present, last page renders after scrolling, page 1
released off-screen, text layer populated, zoom re-renders at the new
scale, no JS errors.
2026-08-08 17:16:15 +01:00

98 lines
4.1 KiB
HTML

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no" />
<meta name="mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<meta name="apple-mobile-web-app-title" content="Agent" />
<meta name="theme-color" content="#faf7f2" media="(prefers-color-scheme: light)" />
<meta name="theme-color" content="#1c1814" media="(prefers-color-scheme: dark)" />
<title>Skald</title>
<link rel="icon" href="/assets/icons/favicon.ico" sizes="any" />
<link rel="icon" href="/assets/icons/icon-192.png" type="image/png" />
<link rel="manifest" href="/manifest.json" />
<link rel="apple-touch-icon" href="/assets/icons/apple-touch-icon.png" />
<script>
(function () {
// Same chain as the desktop shell: a saved choice wins over the OS.
const saved = localStorage.getItem('theme');
const dark = saved ? saved === 'dark' : window.matchMedia('(prefers-color-scheme: dark)').matches;
document.documentElement.setAttribute('data-bs-theme', dark ? 'dark' : 'light');
window.matchMedia('(prefers-color-scheme: dark)')
.addEventListener('change', e => {
if (!localStorage.getItem('theme')) {
document.documentElement.setAttribute('data-bs-theme', e.matches ? 'dark' : 'light');
}
});
})();
</script>
<!-- Font -->
<link rel="preconnect" href="https://fonts.googleapis.com" />
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap" />
<!-- Bootstrap -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" />
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css" />
<link rel="stylesheet" href="css/variables.css" />
<link rel="stylesheet" href="css/setup-page.css" />
<link rel="stylesheet" href="css/copilot-messages.css" />
<link rel="stylesheet" href="css/agent-tasks.css" />
<link rel="stylesheet" href="css/inbox-cards.css" />
<link rel="stylesheet" href="css/file-viewer.css" />
<!-- pdf.js TextLayer's DOM contract (selectable text over the rendered pages). -->
<link rel="stylesheet" href="/vendor/pdf-text-layer.css" />
<link rel="stylesheet" href="css/mobile.css" />
<script type="importmap">
{
"imports": {
"lit": "/vendor/lit-all.min.js",
"lit/directives/unsafe-html.js": "/vendor/lit-all.min.js",
"lit/directives/keyed.js": "/vendor/lit-all.min.js",
"marked": "/vendor/marked.esm.js",
"dompurify": "/vendor/purify.es.mjs"
}
}
</script>
<style>
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body { font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif; }
mobile-app { display: flex; flex-direction: column; height: 100%; }
</style>
</head>
<body>
<mobile-app id="mobile-app"></mobile-app>
<login-page id="login-page" style="display:none"></login-page>
<script>
(function () {
// Native shell handles auth in background — never gate it.
if (new URLSearchParams(location.search).get('native') === 'true') return;
var app = document.getElementById('mobile-app');
var login = document.getElementById('login-page');
fetch('/api/auth/me').then(function (res) {
if (res.ok) return; // logged in — show app
app.style.display = 'none'; // 401 — show login
login.style.display = '';
}).catch(function () {
app.style.display = 'none'; // network error — show login
login.style.display = '';
});
})();
</script>
<script type="module" src="components/mobile-app.js"></script>
</body>
</html>