abstract fun onDragStarted(model: T, itemView: View!, adapterPosition: Int): Unit
Called when the view switches from an idle state to a dragged state, as the user begins a drag interaction with it. You can use this callback to modify the view to indicate it is being dragged.
This is the first callback in the lifecycle of a drag event.
model - T: The model representing the view that is being dragged
itemView - View!: The view that is being dragged
adapterPosition - Int: The adapter position of the model