jquery - How does google calendar make possible scrolling when mouse is outside of the container? -


as can see in following video when mouse outside of events container still scrolled out when mouse goes , bottom when mouse goes bottom.

i need achieve same in following demo. looks following. can see scrolling ugly.

please me. how achieve scrolling in google calendar demo calendar?

in both chrome , safari (tested chrome 43.0.2357.81 , safari 8.0.6), day , week views display events in div id "scrolltimedeventswk". inspecting scrolltimedeventswk element can see rectangular scrollbar native scrollbar, heavily styled using webkit pseudo-elements styling native scrollbars. see: https://www.webkit.org/blog/363/styling-scrollbars/

knowing this, changing vertical scroll position accomplished setting scrolltimedeventswk element's scrolltop. implement animated scroll google calendar's, interval can set on 'mousedown' decreases/increases scrolltop small amount until reaching top/bottom. interval can cleared on 'mouseup'.

here example of "smooth scroll" technique:
http://www.sitepoint.com/scroll-smoothly-javascript/
note in blog article, author developing code smooth scroll on click, such link scrolls top of page on click. technique, however, same.


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