Start repo

app/static/vendors/picocss/theme-switcher.js

@@ -0,0 +1,86 @@
+/*!
+ * Minimal theme switcher
+ *
+ * Pico.css - https://picocss.com
+ * Copyright 2019-2023 - Licensed under MIT
+ */
+
+const themeSwitcher = {
+  // Config
+  _scheme: "auto",
+  menuTarget: "details[role='list']",
+  buttonsTarget: "a[data-theme-switcher]",
+  buttonAttribute: "data-theme-switcher",
+  rootAttribute: "data-theme",
+  localStorageKey: "picoPreferredColorScheme",
+
+  // Init
+  init() {
+    this.scheme = this.schemeFromLocalStorage;
+    this.initSwitchers();
+  },
+
+  // Get color scheme from local storage
+  get schemeFromLocalStorage() {
+    if (typeof window.localStorage !== "undefined") {
+      if (window.localStorage.getItem(this.localStorageKey) !== null) {
+        return window.localStorage.getItem(this.localStorageKey);
+      }
+    }
+    return this._scheme;
+  },
+
+  // Preferred color scheme
+  get preferredColorScheme() {
+    return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
+  },
+
+  // Init switchers
+  initSwitchers() {
+    const buttons = document.querySelectorAll(this.buttonsTarget);
+    buttons.forEach((button) => {
+      button.addEventListener(
+        "click",
+        (event) => {
+          event.preventDefault();
+          // Set scheme
+          this.scheme = button.getAttribute(this.buttonAttribute);
+          // Close dropdown
+          document.querySelector(this.menuTarget).removeAttribute("open");
+        },
+        false
+      );
+    });
+  },
+
+  // Set scheme
+  set scheme(scheme) {
+    if (scheme == "auto") {
+      this.preferredColorScheme == "dark" ? (this._scheme = "dark") : (this._scheme = "light");
+    } else if (scheme == "dark" || scheme == "light") {
+      this._scheme = scheme;
+    }
+    this.applyScheme();
+    this.schemeToLocalStorage();
+  },
+
+  // Get scheme
+  get scheme() {
+    return this._scheme;
+  },
+
+  // Apply scheme
+  applyScheme() {
+    document.querySelector("html").setAttribute(this.rootAttribute, this.scheme);
+  },
+
+  // Store scheme to local storage
+  schemeToLocalStorage() {
+    if (typeof window.localStorage !== "undefined") {
+      window.localStorage.setItem(this.localStorageKey, this.scheme);
+    }
+  },
+};
+
+// Init
+themeSwitcher.init();