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package net.lacolaco.smileessence.view.page
import android.os.Bundle
import android.support.v7.util.SortedList
import android.support.v7.widget.DividerItemDecoration
import android.support.v7.widget.LinearLayoutManager
import android.support.v7.widget.RecyclerView
import android.view.View
import android.view.ViewGroup
import kotlinx.android.synthetic.main.page_fragment_timeline.*
import net.lacolaco.smileessence.data.PageInfo
import net.lacolaco.smileessence.entity.IdObject
abstract class TimelinePageFragment<T : IdObject, out PI : PageInfo> : PageFragment<PI>() {
protected val adapter = TimelineAdapter()
private var adapterDataObserver: RecyclerView.AdapterDataObserver? = null
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(IdObject::class.java, object : SortedList.Callback<IdObject>() {
override fun areItemsTheSame(item1: IdObject, item2: IdObject): Boolean {
return item1 === item2
}
override fun onInserted(position: Int, count: Int) {
notifyItemRangeInserted(position, count)
}
override fun onChanged(position: Int, count: Int) {
notifyItemRangeChanged(position, count)
}
override fun onMoved(fromPosition: Int, toPosition: Int) {
notifyItemMoved(fromPosition, toPosition)
}
override fun areContentsTheSame(oldItem: IdObject, newItem: IdObject): Boolean {
return oldItem === newItem
}
override fun onRemoved(position: Int, count: Int) {
notifyItemRangeRemoved(position, count)
}
override fun compare(o1: IdObject, o2: IdObject): Int {
if (o1.id < o2.id)
return 1
if (o1.id > o2.id)
return -1
return 0
}
})
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
@Suppress("UNCHECKED_CAST")
onBindItemView(sortedList[position] as T, 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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