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index.ts
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index.ts
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import { ref, watch } from 'vue-demi'
import type { MaybeElement } from '../unrefElement'
import { useMutationObserver } from '../useMutationObserver'
export interface UseDirOptions {
/**
* CSS Selector for the target element applying to
*
* @default 'html'
*/
selector?: string
/**
* Observe `document.querySelector(selector)` changes using MutationObserve
*
* @default false
*/
observe?: boolean
}
/**
* Reactive dir of the element's text.
*
* @see https://vueuse.org/useDir
* @param options
*/
export const useDir = (
options: UseDirOptions = {},
) => {
const {
selector = 'html',
observe = false,
} = options
const defaultDir = 'ltr'
const dir = ref(document.querySelector(selector)?.getAttribute('dir') ?? defaultDir)
const isSupportedDir = (dir: string) => {
return ['ltr', 'rtl', 'auto'].includes(dir)
}
watch(dir, () => {
if (isSupportedDir(dir.value))
document.querySelector(selector)?.setAttribute('dir', dir.value)
else
document.querySelector(selector)?.removeAttribute('dir')
}, { immediate: true })
if (observe && document) {
useMutationObserver(
document.querySelector(selector) as MaybeElement,
() => {
const crtDir = document.querySelector(selector)?.getAttribute('dir') ?? defaultDir
dir.value = isSupportedDir(crtDir) ? crtDir : defaultDir
},
{ attributes: true },
)
}
return dir
}