DragItem

Interface which adds ability to drag items for components with datastore inside.

onAfterDrop	fires after drag-n-drop was finished
onBeforeDrag	fires before the mouse button is pressed and the cursor is moved over a draggable item
onBeforeDragIn	fires before a dragged element is moved over the droppable area
onBeforeDrop	fires before a dragged element is released over the droppable area
onBeforeDropOut	fires before a dragged element is released over the droppable area outside the source widget
onDragOut	fires when a dragged element is moved outside of the droppable area

drag	enables or disables drag-and-drop
dragscroll	enables autoscroll of the component during drag-n-drop
prerender	invokes the full rendering of data

$drag	the method is called when a drag operation is initiated
$dragHTML	defines how a dragged item will look
$dragIn	the method is called when an item is moved into a possible drop landing during dnd
$dragMark	called during drag-n-drop, when some item of the component should be marked as an active drop target
$dragOut	the method is called when an item is moved out of a possible drop landing during dnd
$drop	the method is called when an item is dragged and dropped on a valid target
$dropAllow	can be redefined, if you need custom drop rules
$dropHTML	defines how the drop area will look before drop

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