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import { createFocusTrap } from 'focus-trap'
import { focusable, tabbable, isFocusable } from 'tabbable'
export default function (Alpine) {
let lastFocused
let currentFocused
window.addEventListener('focusin', () => {
lastFocused = currentFocused
currentFocused = document.activeElement
})
Alpine.magic('focus', el => {
let within = el
return {
__noscroll: false,
__wrapAround: false,
within(el) { within = el; return this },
withoutScrolling() { this.__noscroll = true; return this },
noscroll() { this.__noscroll = true; return this },
withWrapAround() { this.__wrapAround = true; return this },
wrap() { return this.withWrapAround() },
focusable(el) {
return isFocusable(el)
},
previouslyFocused() {
return lastFocused
},
lastFocused() {
return lastFocused
},
focused() {
return currentFocused
},
focusables() {
if (Array.isArray(within)) return within
return focusable(within, { displayCheck: 'none' })
},
all() { return this.focusables() },
isFirst(el) {
let els = this.all()
return els[0] && els[0].isSameNode(el)
},
isLast(el) {
let els = this.all()
return els.length && els.slice(-1)[0].isSameNode(el)
},
getFirst() { return this.all()[0] },
getLast() { return this.all().slice(-1)[0] },
getNext() {
let list = this.all()
let current = document.activeElement
// Can't find currently focusable element in list.
if (list.indexOf(current) === -1) return
// This is the last element in the list and we want to wrap around.
if (this.__wrapAround && list.indexOf(current) === list.length - 1) {
return list[0]
}
return list[list.indexOf(current) + 1]
},
getPrevious() {
let list = this.all()
let current = document.activeElement
// Can't find currently focusable element in list.
if (list.indexOf(current) === -1) return
// This is the first element in the list and we want to wrap around.
if (this.__wrapAround && list.indexOf(current) === 0) {
return list.slice(-1)[0]
}
return list[list.indexOf(current) - 1]
},
first() { this.focus(this.getFirst()) },
last() { this.focus(this.getLast()) },
next() { this.focus(this.getNext()) },
previous() { this.focus(this.getPrevious()) },
prev() { return this.previous() },
focus(el) {
if (! el) return
setTimeout(() => {
if (! el.hasAttribute('tabindex')) el.setAttribute('tabindex', '0')
el.focus({ preventScroll: this._noscroll })
})
}
}
})
Alpine.directive('trap', Alpine.skipDuringClone(
(el, { expression, modifiers }, { effect, evaluateLater, cleanup }) => {
let evaluator = evaluateLater(expression)
let oldValue = false
let trap = createFocusTrap(el, {
escapeDeactivates: false,
allowOutsideClick: true,
fallbackFocus: () => el,
})
let undoInert = () => {}
let undoDisableScrolling = () => {}
const releaseFocus = () => {
undoInert()
undoInert = () => {}
undoDisableScrolling()
undoDisableScrolling = () => {}
trap.deactivate({
returnFocus: !modifiers.includes('noreturn')
})
}
effect(() => evaluator(value => {
if (oldValue === value) return
// Start trapping.
if (value && ! oldValue) {
setTimeout(() => {
if (modifiers.includes('inert')) undoInert = setInert(el)
if (modifiers.includes('noscroll')) undoDisableScrolling = disableScrolling()
trap.activate()
});
}
// Stop trapping.
if (! value && oldValue) {
releaseFocus()
}
oldValue = !! value
}))
cleanup(releaseFocus)
},
// When cloning, we only want to add aria-hidden attributes to the
// DOM and not try to actually trap, as trapping can mess with the
// live DOM and isn't just isolated to the cloned DOM.
(el, { expression, modifiers }, { evaluate }) => {
if (modifiers.includes('inert') && evaluate(expression)) setInert(el)
},
))
}
function setInert(el) {
let undos = []
crawlSiblingsUp(el, (sibling) => {
let cache = sibling.hasAttribute('aria-hidden')
sibling.setAttribute('aria-hidden', 'true')
undos.push(() => cache || sibling.removeAttribute('aria-hidden'))
})
return () => {
while(undos.length) undos.pop()()
}
}
function crawlSiblingsUp(el, callback) {
if (el.isSameNode(document.body) || ! el.parentNode) return
Array.from(el.parentNode.children).forEach(sibling => {
if (! sibling.isSameNode(el)) callback(sibling)
crawlSiblingsUp(el.parentNode, callback)
})
}
function disableScrolling() {
let overflow = document.documentElement.style.overflow
let paddingRight = document.documentElement.style.paddingRight
let scrollbarWidth = window.innerWidth - document.documentElement.clientWidth
document.documentElement.style.overflow = 'hidden'
document.documentElement.style.paddingRight = `${scrollbarWidth}px`
return () => {
document.documentElement.style.overflow = overflow
document.documentElement.style.paddingRight = paddingRight
}
}
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