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Feature: Instant Theme Change, without refresh [Booking Pages Only] (#1807)

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* Avoid Theme Flicker. Render Server Side

* Add back isReady implementation

* Use shorter syntax for Tag

* Listen to changes in pref-color-scheme and act

* Uglify Theme Applier code

* Resolve conflicts

* Add comments

* Appropriate function name

* Move uglify-js to dependencies

* Remove uglify-js

* Fix commnt

Co-authored-by: Peer Richelsen <peeroke@gmail.com>
Co-authored-by: Omar López <zomars@me.com>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
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hariombalhara 2022-02-16 21:23:26 +05:30 committed by GitHub
parent 34c5360a4d
commit 4693cbba4f
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2 changed files with 28 additions and 14 deletions
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50
apps/web/lib/hooks/useTheme.tsx
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@ -3,28 +3,42 @@ import { useEffect, useState } from "react";
import { Maybe } from "@trpc/server"; import { Maybe } from "@trpc/server";
// makes sure the ui doesn't flash // This method is stringified and executed only on client. So,
export default function useTheme(theme?: Maybe<string>) { // - Pass all the params explicitly to this method. Don't use closure
const [isReady, setIsReady] = useState(false); function applyThemeAndAddListener(theme: string) {
useEffect(() => { const mediaQueryList = window.matchMedia("(prefers-color-scheme: dark)");
setIsReady(true); const applyTheme = function (theme: string, darkMatch: boolean) {
}, []); if (!theme) {
function Theme() { if (darkMatch) {
const themeString = theme ? `"${theme}"` : null;
return (
<Head>
<script
dangerouslySetInnerHTML={{
__html: `(function (theme) {
if (!theme && window.matchMedia("(prefers-color-scheme: dark)").matches) {
document.documentElement.classList.add("dark"); document.documentElement.classList.add("dark");
} else if (!theme) { } else {
/** Uncovered case */ document.documentElement.classList.remove("dark");
}
} else { } else {
document.documentElement.classList.add(theme); document.documentElement.classList.add(theme);
} }
})(${themeString})`, };
}}></script> mediaQueryList.onchange = function (e) {
applyTheme(theme, e.matches);
};
applyTheme(theme, mediaQueryList.matches);
}
// makes sure the ui doesn't flash
export default function useTheme(theme?: Maybe<string>) {
const [isReady, setIsReady] = useState(false);
useEffect(() => {
// TODO: isReady doesn't seem required now. This is also impacting PSI Score for pages which are using isReady.
setIsReady(true);
}, []);
function Theme() {
const code = applyThemeAndAddListener.toString();
const themeStr = theme ? `"${theme}"` : null;
return (
<Head>
<script dangerouslySetInnerHTML={{ __html: `(${code})(${themeStr})` }}></script>
</Head> </Head>
); );
} }