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