screentinker/Examples/PIP-News-Ticker/news-overlay.js
screentinker 0b138f10c6
Add PiP overlay example recipes (#132)
Self-contained examples for the PiP overlay API (POST /api/pip), each
with a CSP-safe query-param overlay (external JS), config.example.json,
zero runtime deps, an offline test, and a README:

- PIP-Announce-Broadcast    manual one-shot message to a screen/group
- PIP-Weather-Widget        Open-Meteo current conditions (keyless)
- PIP-Air-Quality           Open-Meteo US AQI widget (keyless)
- PIP-Crypto-Ticker         CoinGecko price strip (keyless)
- PIP-News-Ticker           scrolling RSS/Atom headlines
- PIP-Room-Status-Calendar  ICS-driven Available/Busy room sign
- PIP-Event-Countdown       client-side countdown, auto-clears at zero
- PIP-Welcome-Board         rotating welcome/birthday cards from CSV
- PIP-Fundraiser-Thermometer goal-progress bar from local/URL JSON
- PIP-QR-Rotator            rotating QR codes, encoded client-side
- PIP-Incident-Webhook      event-driven: red on firing, clear on resolved

Also includes the CAP-AU (NSW RFS) and US NWS/NOAA emergency-alert
monitors that push expiry-aware PiP overlays.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-18 20:20:37 -05:00

61 lines
2.2 KiB
JavaScript

// External overlay script — same-origin so the server CSP (scriptSrc 'self') permits it.
// Reads the headline string from the query and scrolls it right-to-left, seamlessly.
(function () {
var q = new URLSearchParams(location.search);
var text = (q.get('text') || '').trim();
var label = (q.get('label') || 'NEWS').trim();
var sep = q.get('sep') || ' • ';
document.getElementById('label').textContent = label;
var track = document.getElementById('track');
var viewport = track.parentNode;
// Build one "run" of the content (separator-joined headlines). Splitting on the
// separator lets us colour the dividers without trusting feed markup (textContent only).
function buildRun(container) {
var parts = text.length ? text.split(sep) : ['(no headlines)'];
parts.forEach(function (p, i) {
if (i > 0) {
var s = document.createElement('span');
s.className = 'sep';
s.textContent = sep;
container.appendChild(s);
}
var span = document.createElement('span');
span.textContent = p;
container.appendChild(span);
});
}
// Two identical runs back-to-back → when the first scrolls fully off, reset by one
// run width for a seamless loop.
buildRun(track);
var gap = document.createElement('span');
gap.textContent = sep;
gap.className = 'sep';
track.appendChild(gap);
var runWidth = 0;
function measureAndStart() {
runWidth = track.scrollWidth; // width of a single run (+ trailing sep)
buildRun(track); // append the second copy for the wrap
var x = viewport.clientWidth; // start just off the right edge
var speed = 90; // px/sec
var last = null;
function frame(ts) {
if (last == null) last = ts;
var dt = (ts - last) / 1000; last = ts;
x -= speed * dt;
if (x <= -runWidth) x += runWidth; // wrap by exactly one run
track.style.transform = 'translateX(' + x + 'px)';
requestAnimationFrame(frame);
}
requestAnimationFrame(frame);
}
// Wait a tick so fonts/layout settle before measuring.
if (document.readyState === 'complete') measureAndStart();
else window.addEventListener('load', measureAndStart);
})();