From 0a76707062b366af4c6b5e85afb5fcdef6a8196a Mon Sep 17 00:00:00 2001
From: kabirgh <15871468+kabirgh@users.noreply.github.com>
Date: Tue, 23 Jan 2024 22:52:41 +0000
Subject: [PATCH] feat: Emit custom event when theme changes (#723)

---
 quartz/components/scripts/darkmode.inline.ts |   19 ++++++++++++-------
 1 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/quartz/components/scripts/darkmode.inline.ts b/quartz/components/scripts/darkmode.inline.ts
index c42a367..86735e3 100644
--- a/quartz/components/scripts/darkmode.inline.ts
+++ b/quartz/components/scripts/darkmode.inline.ts
@@ -2,15 +2,19 @@
 const currentTheme = localStorage.getItem("theme") ?? userPref
 document.documentElement.setAttribute("saved-theme", currentTheme)
 
+const emitThemeChangeEvent = (theme: "light" | "dark") => {
+  const event: CustomEventMap["themechange"] = new CustomEvent("themechange", {
+    detail: { theme },
+  })
+  document.dispatchEvent(event)
+}
+
 document.addEventListener("nav", () => {
   const switchTheme = (e: any) => {
-    if (e.target.checked) {
-      document.documentElement.setAttribute("saved-theme", "dark")
-      localStorage.setItem("theme", "dark")
-    } else {
-      document.documentElement.setAttribute("saved-theme", "light")
-      localStorage.setItem("theme", "light")
-    }
+    const newTheme = e.target.checked ? "dark" : "light"
+    document.documentElement.setAttribute("saved-theme", newTheme)
+    localStorage.setItem("theme", newTheme)
+    emitThemeChangeEvent(newTheme)
   }
 
   // Darkmode toggle
@@ -28,5 +32,6 @@
     document.documentElement.setAttribute("saved-theme", newTheme)
     localStorage.setItem("theme", newTheme)
     toggleSwitch.checked = e.matches
+    emitThemeChangeEvent(newTheme)
   })
 })

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