django-vue-admin/dvadmin-ui/src/utils/scroll-to.js

59 lines
1.7 KiB
Python
Executable File

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();
}