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fix prefers-reduced-motion detection

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This commit is contained in:
Jake Jarvis
2022-05-03 14:57:32 -04:00
parent bb4115a529
commit 2ea6495fd8
7 changed files with 57 additions and 117 deletions
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39
contexts/ThemeContext.tsx
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@ -1,5 +1,5 @@
import { createContext, useCallback, useEffect, useState } from "react";
import { useLocalStorage } from "react-use";
import { useLocalStorage, useMedia } from "react-use";
import { darkModeQuery, themeStorageKey } from "../lib/config/themes";
import type { Context, PropsWithChildren } from "react";
@ -31,6 +31,9 @@ export const ThemeProvider = ({
const [preferredTheme, setPreferredTheme] = useLocalStorage(themeStorageKey, null, { raw: true });
// save the end result no matter how we got there (by preference or by system):
const [resolvedTheme, setResolvedTheme] = useState("");
// hook into system `prefers-dark-mode` setting
const isSystemDark = useMedia(darkModeQuery, false);
// get the theme names (light, dark) via passed-in classnames' keys
const themeNames = Object.keys(classNames);
@ -49,34 +52,18 @@ export const ThemeProvider = ({
[classNames, setPreferredTheme]
);
// memoize browser media query handler
const handleMediaQuery = useCallback(
(e: MediaQueryListEvent | MediaQueryList) => {
// get the user's preferred theme via their OS/browser settings
const systemTheme = e.matches ? "dark" : "light";
// keep track of the resolved theme whether or not we change it below
setResolvedTheme(systemTheme);
// only actually change the theme if preference is unset (and *don't* save new theme to storage)
if (!preferredTheme || !themeNames.includes(preferredTheme)) {
changeTheme(systemTheme, false);
}
},
[changeTheme, preferredTheme, themeNames]
);
// listen for changes in OS preference
useEffect(() => {
const media = window.matchMedia(darkModeQuery);
media.addEventListener("change", handleMediaQuery);
handleMediaQuery(media);
const systemTheme = isSystemDark ? "dark" : "light";
// clean up the event listener
return () => {
media.removeEventListener("change", handleMediaQuery);
};
}, [handleMediaQuery]);
// keep track of the resolved theme whether or not we change it below
setResolvedTheme(systemTheme);
// only actually change the theme if preference is unset (and *don't* save new theme to storage)
if (!preferredTheme || !themeNames.includes(preferredTheme)) {
changeTheme(systemTheme, false);
}
}, [changeTheme, themeNames, preferredTheme, isSystemDark]);
// color-scheme handling (tells browser how to render built-in elements like forms, scrollbars, etc.)
useEffect(() => {