EXPLAIN ?

module | CoreUI droppable properties can be used to make a draggable object interact with a droppable object,
the effect is a Core-jQuery-UI effect, a droppable object requires a draggable to get activated
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more info on   module | CoreUI droppable   see here Properties
MODULE COREUI DROPPABLE - OVERVIEW
jQuery UI Droppable
TOOL
••• EXAMPLE

A Shape1 as a droppable area for a draggable Layer1

identifier                        : my droppable notes
selector                          : #Shape1
accept | selector                 : #Layer1
tolerance                         : fit
...
event | drop                      : Call_Load_1()
...
run on load                       : true
run on call                       : Call_Drop_1
...

For this droppable to do anything, first a draggable Layer1 needs to be created with   module | draggable
If  this draggable Layer1 is then dropped onto the droppable Shape1 the   event | drop   property will get activated,
and will execute the function   Call_Load_1( )
EVENTS

The droppable can be activated on  Over,  Out,  Activated,  Deactivated  and  Drop
over        =  mouseover droppable
out         =  mouseout  droppable
activate    =  draggable is dragged
deactivate  =  draggable is stopped dragging
drop        =  draggable is dropped onto the droppable