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Theming: color scheme selectors (#8839)

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Adorian Doran 2026-02-26 16:16:52 +02:00 committed by GitHub
commit 28fe73911f
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17
apps/client/src/widgets/containers/root_container.ts
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@ -13,6 +13,8 @@ import FlexContainer from "./flex_container.js";
*
* For convenience, the root container has a few class selectors that can be used to target some global state:
*
* - `#root-container.light-theme`, indicates whether the current color scheme is light.
* - `#root-container.dark-theme`, indicates whether the current color scheme is dark.
* - `#root-container.virtual-keyboard-opened`, on mobile devices if the virtual keyboard is open.
* - `#root-container.horizontal-layout`, if the current layout is horizontal.
* - `#root-container.vertical-layout`, if the current layout is horizontal.
@ -34,6 +36,7 @@ export default class RootContainer extends FlexContainer<BasicWidget> {
window.visualViewport?.addEventListener("resize", () => this.#onMobileResize());
}
this.#initTheme();
this.#setDeviceSpecificClasses();
this.#setMaxContentWidth();
this.#setMotion();
@ -67,6 +70,20 @@ export default class RootContainer extends FlexContainer<BasicWidget> {
}
}
#initTheme() {
const colorSchemeChangeObserver = matchMedia("(prefers-color-scheme: dark)")
colorSchemeChangeObserver.addEventListener("change", () => this.#updateColorScheme());
this.#updateColorScheme();
}
#updateColorScheme() {
const colorScheme = readCssVar(document.body, "theme-style").asString();
document.body.classList.toggle("light-theme", colorScheme === "light");
document.body.classList.toggle("dark-theme", colorScheme === "dark");
}
#onMobileResize() {
const viewportHeight = window.visualViewport?.height ?? window.innerHeight;
const windowHeight = Math.max(window.innerHeight, this.originalWindowHeight); // inner height changes when keyboard is opened, we need to compare with the original height to detect it.