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sidebar.ts
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sidebar.ts
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import { Ref, ref, computed, watchEffect, onMounted, onUnmounted } from 'vue'
import { useRoute, useData } from 'vitepress'
import { getSidebar } from '../support/sidebar'
export function useSidebar() {
const route = useRoute()
const { theme, frontmatter } = useData()
const isOpen = ref(false)
const sidebar = computed(() => {
const sidebarConfig = theme.value.sidebar
const relativePath = route.data.relativePath
return sidebarConfig ? getSidebar(sidebarConfig, relativePath) : []
})
const hasSidebar = computed(() => {
return frontmatter.value.sidebar !== false && sidebar.value.length > 0
})
function open() {
isOpen.value = true
}
function close() {
isOpen.value = false
}
function toggle() {
isOpen.value ? close() : open()
}
return {
isOpen,
sidebar,
hasSidebar,
open,
close,
toggle
}
}
/**
* a11y: cache the element that opened the Sidebar (the menu button) then
* focus that button again when Menu is closed with Escape key.
*/
export function useCloseSidebarOnEscape(
isOpen: Ref<boolean>,
close: () => void
) {
let triggerElement: HTMLButtonElement | undefined
watchEffect(() => {
triggerElement = isOpen.value
? (document.activeElement as HTMLButtonElement)
: undefined
})
onMounted(() => {
window.addEventListener('keyup', onEscape)
})
onUnmounted(() => {
window.removeEventListener('keyup', onEscape)
})
function onEscape(e: KeyboardEvent) {
if (e.key === 'Escape' && isOpen.value) {
close()
triggerElement?.focus()
}
}
}