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115 lines
3.0 KiB
Plaintext
115 lines
3.0 KiB
Plaintext
---
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title: Astro
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description: Adding dark mode to your astro app.
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---
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## Create an inline theme script
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```astro title="src/pages/index.astro"
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---
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import '../styles/globals.css'
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---
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<script is:inline>
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const getThemePreference = () => {
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if (typeof localStorage !== 'undefined' && localStorage.getItem('theme')) {
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return localStorage.getItem('theme');
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}
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return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
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};
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const isDark = getThemePreference() === 'dark';
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document.documentElement.classList[isDark ? 'add' : 'remove']('dark');
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if (typeof localStorage !== 'undefined') {
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const observer = new MutationObserver(() => {
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const isDark = document.documentElement.classList.contains('dark');
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localStorage.setItem('theme', isDark ? 'dark' : 'light');
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});
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observer.observe(document.documentElement, { attributes: true, attributeFilter: ['class'] });
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}
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</script>
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<html lang="en">
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<body>
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<h1>Astro</h1>
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</body>
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</html>
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```
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## Add a mode toggle
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```tsx title="src/components/ModeToggle.tsx"
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import * as React from "react"
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import { Moon, Sun } from "lucide-react"
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import { Button } from "@/components/ui/button"
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import {
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DropdownMenu,
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DropdownMenuContent,
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DropdownMenuItem,
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DropdownMenuTrigger,
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} from "@/components/ui/dropdown-menu"
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export function ModeToggle() {
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const [theme, setThemeState] = React.useState<
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"theme-light" | "dark" | "system"
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>("theme-light")
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React.useEffect(() => {
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const isDarkMode = document.documentElement.classList.contains("dark")
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setThemeState(isDarkMode ? "dark" : "theme-light")
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}, [])
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React.useEffect(() => {
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const isDark =
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theme === "dark" ||
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(theme === "system" &&
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window.matchMedia("(prefers-color-scheme: dark)").matches)
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document.documentElement.classList[isDark ? "add" : "remove"]("dark")
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}, [theme])
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return (
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<DropdownMenu>
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<DropdownMenuTrigger asChild>
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<Button variant="outline" size="icon">
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<Sun className="h-[1.2rem] w-[1.2rem] scale-100 rotate-0 transition-all dark:scale-0 dark:-rotate-90" />
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<Moon className="absolute h-[1.2rem] w-[1.2rem] scale-0 rotate-90 transition-all dark:scale-100 dark:rotate-0" />
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<span className="sr-only">Toggle theme</span>
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</Button>
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</DropdownMenuTrigger>
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<DropdownMenuContent align="end">
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<DropdownMenuItem onClick={() => setThemeState("theme-light")}>
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Light
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</DropdownMenuItem>
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<DropdownMenuItem onClick={() => setThemeState("dark")}>
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Dark
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</DropdownMenuItem>
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<DropdownMenuItem onClick={() => setThemeState("system")}>
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System
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</DropdownMenuItem>
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</DropdownMenuContent>
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</DropdownMenu>
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)
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}
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```
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## Display the mode toggle
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Place a mode toggle on your site to toggle between light and dark mode.
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```astro title="src/pages/index.astro"
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---
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import '../styles/globals.css'
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import { ModeToggle } from '@/components/ModeToggle';
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---
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<!-- Inline script -->
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<html lang="en">
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<body>
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<h1>Astro</h1>
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<ModeToggle client:load />
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</body>
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</html>
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```
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