Drag state for the current cell, returned by useCellDrag. While a
drag is in progress (isDragging is true), the active fields (event,
dropArea, paper, graph, cellId) carry the live drag; when false
they are undefined. isPreview and canDrop are always present.
Drag state for the current cell, returned by useCellDrag. While a drag is in progress (
isDraggingistrue), the active fields (event,dropArea,paper,graph,cellId) carry the live drag; whenfalsethey areundefined.isPreviewandcanDropare always present.