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"use strict";
const defaultTheme = "light";
const stylesheet = document.getElementById("bulma-css");
const htmlTag = document.querySelector("html");
// We include the dark stylesheet in base template to include the rel="preload",
// but remove the actual rel="stylesheet" element here because we won't need it.
document.getElementById("bulma-css-dark").remove();
// Get saved preference for the site in local storage, optionally accounting
// for system preference used when a page loads.
function getCurrentTheme(systemPrefers) {
const theme = localStorage.getItem("theme");
if (theme !== null && theme !== "")
return theme;
if (systemPrefers !== undefined)
return systemPrefers;
return defaultTheme;
}
// Disable & enable the correct CSS stylesheets based on chosen theme.
function setStyleSheets(newTheme) {
switch (newTheme) {
case "light":
stylesheet.href = "/static/css/bulma.css";
break;
case "dark":
stylesheet.href = "/static/css/dark_bulma.css";
break;
}
htmlTag.setAttribute("data-theme", newTheme);
}
// Reflect chosen theme on the switch toggle.
function toggleThemeSwitch(newTheme) {
const switchToggle = document.getElementById("theme-switch");
const knob = document.getElementById("theme-knob");
switch (newTheme) {
case "light":
knob.classList.remove("dark");
knob.classList.add("light");
setTimeout(function() {
switchToggle.classList.remove("dark");
switchToggle.classList.add("light");
}, 100);
break;
case "dark":
knob.classList.remove("light");
knob.classList.add("dark");
setTimeout(function() {
switchToggle.classList.remove("light");
switchToggle.classList.add("dark");
}, 100);
break;
}
}
let theme;
const systemPrefersDark = window.matchMedia("(prefers-color-scheme: dark)");
if (systemPrefersDark.matches)
theme = getCurrentTheme("dark");
else
theme = getCurrentTheme();
setStyleSheets(theme);
// Executed when the page has finished loading.
document.addEventListener("DOMContentLoaded", () => {
toggleThemeSwitch(theme);
systemPrefersDark.addEventListener("change", ({matches: isDark}) => {
const newTheme = isDark ? "dark" : "light";
// Let the new system preference take precedence over toggle preference
// on page reloads.
localStorage.removeItem("theme");
setStyleSheets(newTheme);
toggleThemeSwitch(newTheme);
})
const switchToggle = document.getElementById("theme-switch");
switchToggle.addEventListener("click", () => {
const newTheme = htmlTag.getAttribute("data-theme") === "light" ? "dark" : "light";
localStorage.setItem("theme", newTheme);
setStyleSheets(newTheme);
toggleThemeSwitch(newTheme);
});
});
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