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package net.lacolaco.smileessence.view.page
import android.os.Bundle
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import kotlinx.android.synthetic.main.page_fragment_timeline.*
import net.lacolaco.smileessence.R
import net.lacolaco.smileessence.data.PageInfo
import net.lacolaco.smileessence.entity.IdObject
import net.lacolaco.smileessence.util.SortedList
abstract class TimelinePageFragment<T : IdObject, out PI : PageInfo> : PageFragment<PI>() {
protected val adapter = TimelineAdapter()
private var adapterDataObserver: RecyclerView.AdapterDataObserver? = null
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup,
savedInstanceState: Bundle?): View {
return inflater.inflate(R.layout.page_fragment_timeline, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
tweets_recycler_view.addItemDecoration(
DividerItemDecoration(activity, DividerItemDecoration.VERTICAL))
val lm = LinearLayoutManager(activity)
lm.orientation = LinearLayoutManager.VERTICAL
tweets_recycler_view.layoutManager = lm
tweets_recycler_view.adapter = adapter
tweets_recycler_view.itemAnimator = null
adapterDataObserver = object : RecyclerView.AdapterDataObserver() {
override fun onItemRangeInserted(positionStart: Int, itemCount: Int) {
if (positionStart == 0 && itemCount == 1 &&
lm.findFirstVisibleItemPosition() == 0 &&
(lm.getChildAt(0) == null || lm.getChildAt(0)!!.top == 0)) {
tweets_recycler_view.scrollToPosition(0)
}
}
}
adapter.registerAdapterDataObserver(adapterDataObserver!!)
}
override fun onDestroyView() {
super.onDestroyView()
if (adapterDataObserver != null)
adapter.unregisterAdapterDataObserver(adapterDataObserver!!)
}
abstract fun onBindItemView(item: T, itemView: View)
abstract fun onCreateItemView(parent: ViewGroup): View
protected inner class TimelineAdapter : RecyclerView.Adapter<TimelineAdapter.ViewHolder>() {
val sortedList = SortedList<T>(
{ position -> notifyItemInserted(position) },
{ position, count -> notifyItemRangeRemoved(position, count) }
)
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
onBindItemView(sortedList[position], holder.itemView)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(onCreateItemView(parent))
}
override fun getItemCount(): Int {
return sortedList.size
}
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
}
}
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