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My official website.

src/components/ui/mode-toggle.tsx (view raw)

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import { Button } from '@/components/ui/button'
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu'
import { Laptop, Moon, Sun } from 'lucide-react'
import * as React from 'react'

export function ModeToggle() {
  const [theme, setThemeState] = React.useState<
    'theme-light' | 'dark' | 'system'
  >('theme-light')

  React.useEffect(() => {
    const isDarkMode = document.documentElement.classList.contains('dark')
    setThemeState(isDarkMode ? 'dark' : 'theme-light')
  }, [])

  React.useEffect(() => {
    const isDark =
      theme === 'dark' ||
      (theme === 'system' &&
        window.matchMedia('(prefers-color-scheme: dark)').matches)

    document.documentElement.classList.add('disable-transitions')

    document.documentElement.classList[isDark ? 'add' : 'remove']('dark')

    window
      .getComputedStyle(document.documentElement)
      .getPropertyValue('opacity')

    requestAnimationFrame(() => {
      document.documentElement.classList.remove('disable-transitions')
    })
  }, [theme])

  return (
    <DropdownMenu modal={false}>
      <DropdownMenuTrigger asChild>
        <Button
          variant="outline"
          size="icon"
          className="group"
          title="Toggle theme"
        >
          <Sun className="size-4 rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
          <Moon className="absolute size-4 rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
          <span className="sr-only">Toggle theme</span>
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end" className="bg-background">
        <DropdownMenuItem onClick={() => setThemeState('theme-light')}>
          <Sun className="mr-2 size-4" />
          <span>Light</span>
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setThemeState('dark')}>
          <Moon className="mr-2 size-4" />
          <span>Dark</span>
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setThemeState('system')}>
          <Laptop className="mr-2 size-4" />
          <span>System</span>
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  )
}