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/*
* Copyright © 2019. Daniel Schaal <daniel@schaal.email>
*
* This file is part of ocreader.
*
* ocreader is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ocreader is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
*/
package email.schaal.ocreader.view
import android.os.Bundle
import android.view.LayoutInflater
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.RecyclerView.NO_ID
import email.schaal.ocreader.R
import email.schaal.ocreader.database.model.Item
import email.schaal.ocreader.databinding.ListItemBinding
import java.util.*
class LiveItemsAdapter(private var items: List<Item>?, private val clickListener: ItemViewHolder.OnClickListener) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
/**
* Selected item ids, LinkedHashSet to preserve insertion order for getFirstSelectedItem()
*/
private val selections: MutableSet<Int> = LinkedHashSet()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
return when (viewType) {
R.id.viewtype_item -> {
ItemViewHolder(
ListItemBinding.inflate(
LayoutInflater.from(parent.context),
parent,
false
), clickListener
)
}
else -> throw IllegalArgumentException("Unknown view type")
}
}
override fun getItemId(position: Int): Long {
return items?.get(position)?.id ?: NO_ID
}
fun toggleSelection(position: Int) {
if (selections.contains(position)) selections.remove(position) else selections.add(position)
notifyItemChanged(position)
}
fun clearSelection() {
selections.clear()
notifyDataSetChanged()
}
val selectedItemsCount: Int
get() = selections.size
val selectedItems: Array<Item?>
get() {
val itemsArray = arrayOfNulls<Item>(selections.size)
var i = 0
for (position in selections) {
itemsArray[i++] = items?.get(position)
}
return itemsArray
}
val firstSelectedItem: Item?
get() = if (selections.isEmpty())
null
else
items?.get(selections.iterator().next())
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
if (holder is ItemViewHolder) {
items?.get(position)?.let {
holder.bindItem(it, position, selections.contains(position))
}
}
}
override fun getItemViewType(position: Int): Int {
return R.id.viewtype_item
}
override fun getItemCount(): Int {
return items?.size ?: 0
}
fun updateItems(items: List<Item>?) {
this.items = items
notifyDataSetChanged()
}
fun onSaveInstanceState(bundle: Bundle) {
bundle.putIntegerArrayList("adapter_selections", ArrayList(selections))
}
fun onRestoreInstanceState(bundle: Bundle) {
bundle.getIntegerArrayList("adapter_selections")?.let {
selections.addAll(it)
}
}
init {
setHasStableIds(true)
}
}
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