|
@@ -0,0 +1,58 @@
|
|
|
+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
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+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() {
|
|
|
+
|
|
|
+ currentTime += increment
|
|
|
+
|
|
|
+ var val = Math.easeInOutQuad(currentTime, start, change, duration)
|
|
|
+
|
|
|
+ move(val)
|
|
|
+
|
|
|
+ if (currentTime < duration) {
|
|
|
+ requestAnimFrame(animateScroll)
|
|
|
+ } else {
|
|
|
+ if (callback && typeof (callback) === 'function') {
|
|
|
+
|
|
|
+ callback()
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ animateScroll()
|
|
|
+}
|