Fix list items reorder
parent
21639ddcbc
commit
357669d8b2
GPG Key ID:
676DEE768C17A9D7
@ -0,0 +1,75 @@
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package org.koitharu.kotatsu.core.ui
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import androidx.recyclerview.widget.AsyncListDiffer.ListListener
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import androidx.recyclerview.widget.DiffUtil
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import com.hannesdorfmann.adapterdelegates4.AdapterDelegate
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import com.hannesdorfmann.adapterdelegates4.ListDelegationAdapter
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.flow.FlowCollector
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import kotlinx.coroutines.withContext
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import org.koitharu.kotatsu.list.ui.adapter.ListItemType
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import org.koitharu.kotatsu.list.ui.model.ListModel
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import java.util.Collections
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import java.util.LinkedList
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open class ReorderableListAdapter<T : ListModel> : ListDelegationAdapter<List<T>>(), FlowCollector<List<T>?> {
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private val listListeners = LinkedList<ListListener<T>>()
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override suspend fun emit(value: List<T>?) {
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val oldList = items.orEmpty()
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val newList = value.orEmpty()
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val diffResult = withContext(Dispatchers.Default) {
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val diffCallback = DiffCallback(oldList, newList)
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DiffUtil.calculateDiff(diffCallback)
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}
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super.setItems(newList)
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diffResult.dispatchUpdatesTo(this)
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listListeners.forEach { it.onCurrentListChanged(oldList, newList) }
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}
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@Deprecated("Use emit() to dispatch list updates", level = DeprecationLevel.ERROR)
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override fun setItems(items: List<T>?) {
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super.setItems(items)
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}
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fun reorderItems(oldPos: Int, newPos: Int) {
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Collections.swap(items ?: return, oldPos, newPos)
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notifyItemMoved(oldPos, newPos)
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}
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fun addDelegate(type: ListItemType, delegate: AdapterDelegate<List<T>>): ReorderableListAdapter<T> {
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delegatesManager.addDelegate(type.ordinal, delegate)
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return this
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}
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fun addListListener(listListener: ListListener<T>) {
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listListeners.add(listListener)
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}
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fun removeListListener(listListener: ListListener<T>) {
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listListeners.remove(listListener)
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}
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protected class DiffCallback<T : ListModel>(
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val oldList: List<T>,
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val newList: List<T>,
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) : DiffUtil.Callback() {
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override fun getOldListSize(): Int = oldList.size
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override fun getNewListSize(): Int = newList.size
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override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
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val oldItem = oldList[oldItemPosition]
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val newItem = newList[newItemPosition]
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return newItem.areItemsTheSame(oldItem)
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}
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override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
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val oldItem = oldList[oldItemPosition]
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val newItem = newList[newItemPosition]
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return newItem == oldItem
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}
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}
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}
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