CanDrop

fires when a dragged file is over a target file in the queue

void CanDrop(object data,Event e);

data	object	data object
e	Event	a native event object

vault.events.on("CanDrop", function(data, events){
    // your logic here
});

Details

The data object can contain the following parameters:

start	(string) the id of a file, from which the dragging process has started
source	(string[]) an array with ids of dragged files
target	(string) the id of a potential target file