DragControl

Handlers drag-n-drop events.

addDrag	registers drag area
addDrop	registers drop area
createDrag	called when drag-n-drop is initiated, creates drag representation
destroyDrag	called after drag-n-drop, removes all traces and html elements
getContext	gets drag-n-drop context object
getMaster	returns object which controls dnd
getNode	gets HTML node of drag marker
sendSignal	sets drag-n-drop active state for drag-n-drop context object
unlink	removes the component from dnd logic

$drag	called when drag-n-drop has started and defines a dragging behavior
$dragIn	called when mouse was moved in drop area and defines marker behavior within the drop area
$dragOut	called when the mouse pointer has been moved out of the drop area
$dragPos	defines the position of a dragged item
$drop	called when mouse was released over drop area and defines dropping behavior
left	position of drag marker relative to mouse cursor
top	position of drag marker relative to cursor

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