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fix: auto theme does not update when OS switches day/night mode #12278

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fix: auto theme does not update when OS switches day/night mode #12278

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14 changes: 14 additions & 0 deletions frontend/src/global/use-theme.ts
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import { onUnmounted } from 'vue';
import { GlobalStore } from '@/store';
import { setPrimaryColor } from '@/utils/theme';

Expand Down Expand Up @@ -26,6 +27,19 @@ export const useTheme = () => {
}
};

// Listen for OS theme changes when theme is set to "auto"
const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
const onSystemThemeChange = () => {
const globalStore = GlobalStore();
if (globalStore.themeConfig.theme === 'auto') {
switchTheme();
}
};
mediaQuery.addEventListener('change', onSystemThemeChange);
onUnmounted(() => {
mediaQuery.removeEventListener('change', onSystemThemeChange);
});

return {
switchTheme,
};
Expand Down