A DragEvent is triggered at certain stage of a drag and drop operation. DragEvent
will bubble up.
DragEvents types include:
- dragOut - fired when the item being dragged is moved outside of a box
- dragDrop - fired when the item is dropped on a box
- dragStart - fired when an item is pressed, and beings to be dragged
- dragOver - fired when the item we are dragging moves over a box
- dragStop - fired when a drag and drop operation is finished
- dragMove - fired when an items is being dragged around