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/*!
* SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
import type { Ref } from 'vue'
import { onMounted, readonly, ref } from 'vue'
/** The element we observe */
let element: HTMLElement | undefined
/** The current width of the element */
const width = ref(0)
const observer = new ResizeObserver((elements) => {
if (elements[0].contentBoxSize) {
// use the newer `contentBoxSize` property if available
width.value = elements[0].contentBoxSize[0].inlineSize
} else {
// fall back to `contentRect`
width.value = elements[0].contentRect.width
}
})
/**
* Update the observed element if needed and reconfigure the observer
*/
function updateObserver() {
const el = document.querySelector<HTMLElement>('#app-content-vue') ?? document.body
if (el !== element) {
// if already observing: stop observing the old element
if (element) {
observer.unobserve(element)
}
// observe the new element if needed
observer.observe(el)
element = el
}
}
/**
* Get the reactive width of the file list
*/
export function useFileListWidth(): Readonly<Ref<number>> {
// Update the observer when the component is mounted (e.g. because this is the files app)
onMounted(updateObserver)
// Update the observer also in setup context, so we already have an initial value
updateObserver()
return readonly(width)
}
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