These docs are for an old release. Info on upgrading to v4
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Triggered when event dragging begins.

function( event, jsEvent, ui, view ) { }

event is an Event Object that hold the event’s information (date, title, etc).

jsEvent holds the jQuery event with low-level information such as click coordinates.

ui holds an empty object. Before version 2.1, the jQuery UI object.

view holds the current View Object.