Téléversement initial

themes/slowbrain/assets/js/main.js

@@ -0,0 +1,57 @@
+/**
+ * Theming.
+ *
+ * Supports the preferred color scheme of the operation system as well as
+ * the theme choice of the user.
+ *
+ */
+const themeToggle = document.querySelector(".theme-toggle");
+const chosenTheme = window.localStorage && window.localStorage.getItem("theme");
+const chosenThemeIsDark = chosenTheme == "dark";
+const chosenThemeIsLight = chosenTheme == "light";
+
+// Detect the color scheme the operating system prefers.
+function detectOSColorTheme() {
+  if (chosenThemeIsDark) {
+    document.documentElement.setAttribute("data-theme", "dark");
+  } else if (chosenThemeIsLight) {
+    document.documentElement.setAttribute("data-theme", "light");
+  } else if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
+    document.documentElement.setAttribute("data-theme", "dark");
+  } else {
+    document.documentElement.setAttribute("data-theme", "light");
+  }
+}
+
+// Switch the theme.
+function switchTheme(e) {
+  if (chosenThemeIsDark) {
+    localStorage.setItem("theme", "light");
+  } else if (chosenThemeIsLight) {
+    localStorage.setItem("theme", "dark");
+  } else {
+    if (document.documentElement.getAttribute("data-theme") == "dark") {
+      localStorage.setItem("theme", "light");
+    } else {
+      localStorage.setItem("theme", "dark");
+    }
+  }
+
+  detectOSColorTheme();
+  window.location.reload();
+}
+
+// Event listener
+if (themeToggle) {
+  themeToggle.addEventListener("click", switchTheme, false);
+  window
+    .matchMedia("(prefers-color-scheme: dark)")
+    .addEventListener("change", (e) => e.matches && detectOSColorTheme());
+  window
+    .matchMedia("(prefers-color-scheme: light)")
+    .addEventListener("change", (e) => e.matches && detectOSColorTheme());
+
+  detectOSColorTheme();
+} else {
+  localStorage.removeItem("theme");
+}