Viewholders.kt

abstract class BaseViewHolder<T>(itemView: View) : RecyclerView.ViewHolder(itemView) {

    abstract fun bind(data: T)

}

class CardViewHolder(itemView: View,
                     private val glide: RequestManager,
                     private val clickListener: (DataWrapper.CardData) -> Unit,
                     private val deleteListener: (DataWrapper.CardData) -> Unit) : BaseViewHolder<DataWrapper.CardData>(itemView) {

    private val header = itemView.findViewById<TextView>(R.id.header)
    private val body = itemView.findViewById<TextView>(R.id.body)
    private val image = itemView.findViewById<ImageView>(R.id.image)
    private val deleteButton = itemView.findViewById<ImageView>(R.id.delete_button)


    override fun bind(data: DataWrapper.CardData) {
        header.text = data.header
        body.text = data.body
        glide.load(data.imageUrl).into(image)
        itemView.setOnClickListener { clickListener(data) }
        deleteButton.setOnClickListener { deleteListener(data) }
    }

}

class CarouselViewHolder(itemView: View, clickListener: (CarouselItem) -> Unit) : BaseViewHolder<List<CarouselItem>>(itemView) {

    private val recyclerView = itemView.findViewById<RecyclerView>(R.id.carousel_recyclerview)
    private val adapter = CarouselListAdapter(clickListener)

    init {
        recyclerView.adapter = adapter
    }

    override fun bind(data: List<CarouselItem>) = adapter.submitList(data)

}