63 lines
2.6 KiB
JavaScript
63 lines
2.6 KiB
JavaScript
// Sirius.X font picker — reader chooses between Fraunces (Silent Mode
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// family — editorial serif, default) and Ubuntu (Bitcoin Cash brand
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// font — humanist sans). Persisted in localStorage under 'sirius-font'.
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//
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// The runtime attribute goes on <html> — pages that want to opt out
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// simply omit the include. The actual font-swap CSS is defined per
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// page (in each page's <style> block) so it can override the page's
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// own font-family declarations at high specificity; this script only
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// toggles the attribute and paints the picker UI.
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(function () {
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var KEY = "sirius-font";
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var saved = null;
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try { saved = localStorage.getItem(KEY); } catch (e) { /* private mode */ }
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var initial = saved === "ubuntu" ? "ubuntu" : "fraunces";
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if (initial === "ubuntu") document.documentElement.setAttribute("data-font-cmp", "ubuntu");
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// Inject the picker into the topnav's right side when one exists.
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// Falls back to a fixed-position pill (bottom-right) for pages without
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// a topnav, so the choice is always available.
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function paintPicker() {
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var nav = document.querySelector(".topnav");
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var host = nav || document.body;
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var mount = document.createElement("div");
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mount.className = "font-picker";
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mount.setAttribute("role", "group");
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mount.setAttribute("aria-label", "Reading font");
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mount.innerHTML =
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'<button data-font="fraunces" title="Silent Mode family (Fraunces)">Fraunces</button>' +
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'<button data-font="ubuntu" title="Bitcoin Cash brand font (Ubuntu)">Ubuntu</button>';
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if (nav) {
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// Put it just before the sign-in link if present, else append.
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var portalLink = nav.querySelector("a.portal");
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if (portalLink) nav.insertBefore(mount, portalLink);
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else nav.appendChild(mount);
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} else {
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mount.classList.add("font-picker-float");
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host.appendChild(mount);
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}
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var btns = mount.querySelectorAll("button");
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function refresh(v) {
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for (var i = 0; i < btns.length; i++) {
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btns[i].classList.toggle("active", btns[i].dataset.font === v);
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}
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}
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refresh(initial);
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for (var i = 0; i < btns.length; i++) {
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btns[i].addEventListener("click", function (e) {
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var v = e.currentTarget.dataset.font;
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if (v === "ubuntu") document.documentElement.setAttribute("data-font-cmp", "ubuntu");
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else document.documentElement.removeAttribute("data-font-cmp");
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try { localStorage.setItem(KEY, v); } catch (e2) { /* ignore */ }
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refresh(v);
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});
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}
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}
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if (document.readyState === "loading") {
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document.addEventListener("DOMContentLoaded", paintPicker);
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} else {
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paintPicker();
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}
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})();
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