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import { shallowRef, unref } from 'vue'
interface UseScrollToOptions {
el: any
to: number
duration?: number
callback?: () => any
}
function easeInOutQuad(t: number, b: number, c: number, d: number) {
t /= d / 2
if (t < 1)
return (c / 2) * t * t + b
t--
return (-c / 2) * (t * (t - 2) - 1) + b
}
function move(el: HTMLElement, amount: number) {
el.scrollTop = amount
}
function position(el: HTMLElement) {
return el.scrollTop
}
function useScrollTo({ el, to, duration = 500, callback }: UseScrollToOptions) {
const isActiveRef = shallowRef(false)
const start = position(el)
const change = to - start
const increment = 20
let currentTime = 0
const animateScroll = function () {
if (!unref(isActiveRef))
return
currentTime += increment
const val = easeInOutQuad(currentTime, start, change, duration)
move(el, val)
if (currentTime < duration && unref(isActiveRef)) {
requestAnimationFrame(animateScroll)
}
else {
if (callback && typeof callback === 'function')
callback()
}
}
const run = () => {
isActiveRef.value = true
animateScroll()
}
const stop = () => {
isActiveRef.value = false
}
return { start: run, stop }
}
export { useScrollTo, type UseScrollToOptions }