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gaia/apps/calendar/js/utils/animated_scroll.js

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+define(function(require, exports, module) {
+'use strict';
+
+module.exports = function animatedScroll(opts) {
+  var {container, content, scrollTop} = opts;
+
+  var maxScroll = container.scrollHeight - container.clientHeight;
+  // safeguard against negative or `null` scrollTop (0 < scrollTop < maxScroll)
+  scrollTop = Math.min(Math.max(scrollTop, 0), maxScroll);
+
+  var diff = container.scrollTop - scrollTop;
+  var seconds = Math.abs(diff) / 500;
+
+  // hide scrollbar during animation to avoid errors introduced by user trying
+  // to scroll while transition is still running; it also avoids weird
+  // sensation of content moving while scrollbar is still at same position
+  container.style.overflowY = 'hidden';
+
+  window.requestAnimationFrame(() => {
+    content.style.transform = 'translateY(' + diff + 'px)';
+    // easeOutQuart borrowed from http://matthewlein.com/ceaser/
+    content.style.transition = 'transform ' + seconds + 's ' +
+      'cubic-bezier(0.165, 0.840, 0.440, 1.000)';
+  });
+
+  content.addEventListener('transitionend', function setScrollTop() {
+    content.removeEventListener('transitionend', setScrollTop);
+    content.style.transform = '';
+    content.style.transition = '';
+    container.scrollTop = scrollTop;
+    container.style.overflowY = 'scroll';
+  });
+};
+
+});