ganarajpr/angular-dragdrop — pull request #31 by LiamKarlMitchell (2014-05-23 03:48:55+00:00)
Title: $data is reference to drag expression now. And can prevent drop operation.

$data now is exact reference of the drag="whatever" expression.
ui-can-drop="canDrop($event, $data)" can be used and return false to
deny a move to the drop container.

Updated documentation too.