Created
March 28, 2020 03:26
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| class Smooth { | |
| constructor() { | |
| } | |
| bindMethods() { | |
| ['scroll', 'run', 'resize'] | |
| .forEach((fn) => this[fn] = this[fn].bind(this)) | |
| } | |
| setStyles() { | |
| this.dom.el.style.position = 'fixed'; | |
| this.dom.el.style.top = 0; | |
| this.dom.el.style.left = 0; | |
| this.dom.el.style.height = '100%' | |
| this.dom.el.style.width = '100%' | |
| this.dom.el.style.overflow = 'hidden' | |
| } | |
| setHeight() { | |
| document.body.style.height = `${this.dom.content.offsetHeight}px` | |
| } | |
| resize() { | |
| this.setHeight() | |
| this.scroll() | |
| } | |
| scroll() { | |
| this.data.current = window.scrollY | |
| } | |
| run() { | |
| this.data.last = this.math.lerp(this.data.last, this.data.current, this.data.ease) | |
| this.data.last = Math.floor(this.data.last * 100) / 100 | |
| const diff = this.data.current - this.data.last | |
| const acc = diff / this.config.width | |
| const velo = + acc | |
| this.dom.content.style.transform = `translate3d(0, -${this.data.last.toFixed(0)}px, 0)` | |
| console.log(this.test) | |
| this.requestAnimationFrame() | |
| } | |
| on(requestAnimationFrame = true) { | |
| this.setStyles() | |
| this.setHeight() | |
| this.addEvents() | |
| requestAnimationFrame && this.requestAnimationFrame() | |
| } | |
| off(cancelAnimationFrame = true) { | |
| cancelAnimationFrame && this.cancelAnimationFrame() | |
| this.removeEvents() | |
| } | |
| requestAnimationFrame() { | |
| this.rAF = requestAnimationFrame(this.run) | |
| } | |
| cancelAnimationFrame() { | |
| cancelAnimationFrame(this.rAF) | |
| } | |
| destroy() { | |
| this.rAF = null | |
| document.body.style.height = '' | |
| this.data = null | |
| this.removeEvents() | |
| this.cancelAnimationFrame() | |
| } | |
| resize() { | |
| this.setHeight() | |
| } | |
| addEvents() { | |
| window.addEventListener('resize', this.resize, { passive: true }) | |
| window.addEventListener('scroll', this.scroll, { passive: true }) | |
| } | |
| removeEvents() { | |
| window.removeEventListener('resize', this.resize, { passive: true }) | |
| window.removeEventListener('scroll', this.scroll, { passive: true }) | |
| } | |
| init() { | |
| this.math = { | |
| lerp: (a, b, n) => { | |
| return (1 - n) * a + n * b | |
| }, | |
| norm: (value, min, max) => { | |
| return (value - min) / (max - min) | |
| } | |
| } | |
| this.config = { | |
| height: window.innerHeight, | |
| width: window.innerWidth | |
| } | |
| this.bindMethods() | |
| this.data = { | |
| ease: 0.045, | |
| current: 0, | |
| last: 0 | |
| } | |
| this.dom = { | |
| el: document.querySelector('[data-scroll]'), | |
| content: document.querySelector('[data-scroll-content]') | |
| } | |
| this.rAF = null | |
| this.on() | |
| } | |
| } | |
| export const scroll = new Smooth() |
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