You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
1.7 KiB
58 lines
1.7 KiB
Math.easeInOutQuad = function(t, b, c, d) { |
|
t /= d / 2 |
|
if (t < 1) { |
|
return c / 2 * t * t + b |
|
} |
|
t-- |
|
return -c / 2 * (t * (t - 2) - 1) + b |
|
} |
|
|
|
// requestAnimationFrame for Smart Animating http://goo.gl/sx5sts |
|
var requestAnimFrame = (function() { |
|
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function(callback) { window.setTimeout(callback, 1000 / 60) } |
|
})() |
|
|
|
/** |
|
* Because it's so fucking difficult to detect the scrolling element, just move them all |
|
* @param {number} amount |
|
*/ |
|
function move(amount) { |
|
document.documentElement.scrollTop = amount |
|
document.body.parentNode.scrollTop = amount |
|
document.body.scrollTop = amount |
|
} |
|
|
|
function position() { |
|
return document.documentElement.scrollTop || document.body.parentNode.scrollTop || document.body.scrollTop |
|
} |
|
|
|
/** |
|
* @param {number} to |
|
* @param {number} duration |
|
* @param {Function} callback |
|
*/ |
|
export function scrollTo(to, duration, callback) { |
|
const start = position() |
|
const change = to - start |
|
const increment = 20 |
|
let currentTime = 0 |
|
duration = (typeof (duration) === 'undefined') ? 500 : duration |
|
var animateScroll = function() { |
|
// increment the time |
|
currentTime += increment |
|
// find the value with the quadratic in-out easing function |
|
var val = Math.easeInOutQuad(currentTime, start, change, duration) |
|
// move the document.body |
|
move(val) |
|
// do the animation unless its over |
|
if (currentTime < duration) { |
|
requestAnimFrame(animateScroll) |
|
} else { |
|
if (callback && typeof (callback) === 'function') { |
|
// the animation is done so lets callback |
|
callback() |
|
} |
|
} |
|
} |
|
animateScroll() |
|
}
|
|
|