File size: 1,709 Bytes
88c4c60 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | "use client";
import { useEffect, useState, useSyncExternalStore } from "react";
import useThemeStore from "@/store/themeStore";
// Subscribe to system theme changes
function subscribeToSystemTheme(callback) {
if (typeof window === "undefined") return () => {};
const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)");
mediaQuery.addEventListener("change", callback);
return () => mediaQuery.removeEventListener("change", callback);
}
// Get current system theme preference
function getSystemThemeSnapshot() {
if (typeof window === "undefined") return false;
return window.matchMedia("(prefers-color-scheme: dark)").matches;
}
// Server snapshot always returns false
function getServerSnapshot() {
return false;
}
export function useTheme() {
const { theme, setTheme, toggleTheme, initTheme } = useThemeStore();
// Use useSyncExternalStore to safely subscribe to system theme
const systemPrefersDark = useSyncExternalStore(
subscribeToSystemTheme,
getSystemThemeSnapshot,
getServerSnapshot
);
useEffect(() => {
initTheme();
}, [initTheme]);
// Listen for system theme changes when theme is "system"
useEffect(() => {
if (theme !== "system") return;
const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)");
const handleChange = () => initTheme();
mediaQuery.addEventListener("change", handleChange);
return () => mediaQuery.removeEventListener("change", handleChange);
}, [theme, initTheme]);
// Compute isDark from current state (no effect needed)
const isDark = theme === "dark" || (theme === "system" && systemPrefersDark);
return {
theme,
setTheme,
toggleTheme,
isDark,
};
}
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