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59 lines
1.3 KiB
59 lines
1.3 KiB
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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