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color pref persistence

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This commit is contained in:
Michael Freno
2025-12-31 01:44:00 -05:00
parent 28cabb8d16
commit 81b7c6e322
2 changed files with 57 additions and 4 deletions
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48
src/context/darkMode.tsx
View File

@@ -26,16 +26,39 @@ export function useDarkMode() {
return context;
}
const STORAGE_KEY = "theme-override";
const getSystemPreference = () => {
if (typeof window !== "undefined") {
return window.matchMedia("(prefers-color-scheme: dark)").matches;
}
return false;
};
const getInitialTheme = () => {
if (typeof window === "undefined") return false;
const storedOverride = localStorage.getItem(STORAGE_KEY);
if (storedOverride !== null) {
return storedOverride === "dark";
}
return getSystemPreference();
};
export const DarkModeProvider: ParentComponent = (props) => {
const [isDark, setIsDark] = createSignal(false);
// Initialize with correct theme synchronously
const [isDark, setIsDark] = createSignal(getInitialTheme());
onMount(() => {
const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)");
setIsDark(mediaQuery.matches);
// Listen for system theme changes
const handleChange = (e: MediaQueryListEvent) => {
// Only update if there's no explicit override
const storedOverride = localStorage.getItem(STORAGE_KEY);
if (storedOverride === null) {
setIsDark(e.matches);
}
};
mediaQuery.addEventListener("change", handleChange);
@@ -57,11 +80,30 @@ export const DarkModeProvider: ParentComponent = (props) => {
});
const toggleDarkMode = () => {
setIsDark(!isDark());
const newValue = !isDark();
setIsDark(newValue);
// Only persist if different from system preference
const systemPreference = getSystemPreference();
if (newValue !== systemPreference) {
localStorage.setItem(STORAGE_KEY, newValue ? "dark" : "light");
} else {
// If matching system preference, remove override
localStorage.removeItem(STORAGE_KEY);
}
};
const setDarkMode = (dark: boolean) => {
setIsDark(dark);
// Only persist if different from system preference
const systemPreference = getSystemPreference();
if (dark !== systemPreference) {
localStorage.setItem(STORAGE_KEY, dark ? "dark" : "light");
} else {
// If matching system preference, remove override
localStorage.removeItem(STORAGE_KEY);
}
};
return (

11
src/entry-server.tsx
View File

@@ -12,6 +12,17 @@ export default createHandler(() => (
content="width=device-width, initial-scale=1, maximum-scale=1"
/>
<link rel="icon" href="/favicon.ico" />
<script>
{`
(function() {
const STORAGE_KEY = 'theme-override';
const stored = localStorage.getItem(STORAGE_KEY);
const systemDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
const isDark = stored !== null ? stored === 'dark' : systemDark;
document.documentElement.classList.add(isDark ? 'dark' : 'light');
})();
`}
</script>
{assets}
</head>
<body>