The current mouse x,y position relative to the viewport. Returns null if no item is being dragged.

A vector x,y of the displacement of the dragged item from its initial position. Returns null if no item is being dragged.

The initial mouse x,y position relative to the viewport, when the current drag operation started. Returns null if no item is being dragged.

x,y relative to viewport of the item's DOM element before it was dragged. Returns null if no item is being dragged.

The item in transit, if any. This is what you returned from DragSourceSpec. Returns null if no item is being dragged.

The type of the item in transit. Returns null if no item is being dragged.

The projected x,y position relative to viewport of the root DOM element of the drag source = its initial position + displacement. Returns null if no item is being dragged.