Reuse AdapterDelegate<List<T>> in a domain specific way about adapterdelegates

[sockeqwe]

yea, I feel your pain.

I am considering removing (in AdapterDelegates 5) the need of specifying a base class, so essentially AdatperDelegate operate on datasource List<Any> and then indeed have some @Suppress("UNCHECKED_CAST") internally.

[vanniktech]

That'd be cool too

[vanniktech]

The above does not actually work if you have different item view types. In my first use case it either had X or Y. Having X & Y would crash. Updated version:

@Suppress("UNCHECKED_CAST", "PROTECTED_CALL_FROM_PUBLIC_INLINE")
inline fun <Old, reified I : T, T> AdapterDelegate<List<Old>>.wrap(noinline mapper: (I) -> Old): AdapterDelegate<List<T>> {
  val listItemAdapterDelegate = this as AbsListItemAdapterDelegate<Old, Old, AdapterDelegateViewHolder<Old>>
  return object : AbsListItemAdapterDelegate<I, T, RecyclerView.ViewHolder>() {
    override fun isForViewType(item: T, items: MutableList<T>, position: Int): Boolean = item is I

    override fun onBindViewHolder(item: I, holder: RecyclerView.ViewHolder, payloads: MutableList<Any>) {
      listItemAdapterDelegate.onBindViewHolder(mapper.invoke(item), holder as AdapterDelegateViewHolder<Old>, payloads)
    }

    override fun onCreateViewHolder(parent: ViewGroup) = listItemAdapterDelegate.onCreateViewHolder(parent)
  }
}