docs/.vitepress/components/CustomSwitchAppearance.vue at c4ccb05475e7ef594ed51605f38cb4547cd84e66 · PenguLoader/docs · GitHub

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<script setup lang="ts">
import { inject, onMounted, ref } from 'vue'
import { useData } from 'vitepress'

import VPIconMoon from 'vitepress/dist/client/theme-default/components/icons/VPIconMoon.vue'
import VPIconSun from 'vitepress/dist/client/theme-default/components/icons/VPIconSun.vue'

const { isDark } = useData()

const toggleAppearance = inject('toggle-appearance', () => {
  isDark.value = !isDark.value
})

const supportsViewTransition = ref(false)

onMounted(() => {
  supportsViewTransition.value = 'startViewTransition' in document
    && window.matchMedia('(prefers-reduced-motion: no-preference)').matches
})
</script>

<template>
  <button type="button" role="switch" title="Toggle dark mode" class="c-switch-appearance" :aria-checked="isDark"
    :data-view-transition="supportsViewTransition" @click="toggleAppearance">
    <ClientOnly>
      <Transition name="fade" mode="out-in">
        <VPIconSun v-if="!isDark" class="sun" />
        <VPIconMoon v-else class="moon" />
      </Transition>
    </ClientOnly>
  </button>
</template>

<style scoped>
.c-switch-appearance {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  color: var(--vp-c-text-2);
  transition: color 0.5s;
}

.c-switch-appearance:hover {
  color: var(--vp-c-text-1);
  transition: color 0.25s;
}

.c-switch-appearance :deep(svg) {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* `<Transition name="fade">` needs these -- VitePress ships no global `fade`
   classes, so without them the icon swap was an instant cut. */
.fade-enter-active,
.fade-leave-active {
  transition: opacity 0.15s ease;
}

.fade-enter-from,
.fade-leave-to {
  opacity: 0;
}
</style>