list: remove synclistdiffer
Forgot to remove this now useless class.
This commit is contained in:
Alexander Capehart
parent
df98bb535f
commit
bfbf805adc
2 changed files with 1 additions and 142 deletions
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@ -54,7 +54,7 @@ abstract class DiffAdapter<T, VH : RecyclerView.ViewHolder>(differFactory: ListD
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}
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/**
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* Update this list using [DiffUtil]. This can simplify the work of updating the list, but can
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* Update this list using DiffUtil. This can simplify the work of updating the list, but can
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* also cause erratic behavior.
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* @param newList The new list of [T] items to show.
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* @param onDone Callback that will be invoked when the update is completed, allowing means to
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@ -1,141 +0,0 @@
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/*
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* Copyright (c) 2022 Auxio Project
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package org.oxycblt.auxio.list.recycler
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import androidx.recyclerview.widget.AdapterListUpdateCallback
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import androidx.recyclerview.widget.DiffUtil
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import androidx.recyclerview.widget.RecyclerView
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/**
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* A list differ that operates synchronously. This can help resolve some shortcomings with
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* AsyncListDiffer, at the cost of performance. Derived from Material Files:
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* https://github.com/zhanghai/MaterialFiles
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* @author Hai Zhang, Alexander Capehart (OxygenCobalt)
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*/
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class SyncListDiffer<T>(
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adapter: RecyclerView.Adapter<*>,
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private val diffCallback: DiffUtil.ItemCallback<T>
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) {
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private val updateCallback = AdapterListUpdateCallback(adapter)
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var currentList: List<T> = emptyList()
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private set(newList) {
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if (newList === currentList || newList.isEmpty() && currentList.isEmpty()) {
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return
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}
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if (newList.isEmpty()) {
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val oldListSize = currentList.size
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field = emptyList()
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updateCallback.onRemoved(0, oldListSize)
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return
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}
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if (currentList.isEmpty()) {
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field = newList
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updateCallback.onInserted(0, newList.size)
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return
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}
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val oldList = currentList
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val result =
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DiffUtil.calculateDiff(
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object : DiffUtil.Callback() {
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override fun getOldListSize(): Int {
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return oldList.size
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}
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override fun getNewListSize(): Int {
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return newList.size
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}
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override fun areItemsTheSame(
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oldItemPosition: Int,
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newItemPosition: Int
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): Boolean {
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val oldItem: T? = oldList[oldItemPosition]
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val newItem: T? = newList[newItemPosition]
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return if (oldItem != null && newItem != null) {
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diffCallback.areItemsTheSame(oldItem, newItem)
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} else {
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oldItem == null && newItem == null
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}
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}
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override fun areContentsTheSame(
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oldItemPosition: Int,
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newItemPosition: Int
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): Boolean {
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val oldItem: T? = oldList[oldItemPosition]
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val newItem: T? = newList[newItemPosition]
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return if (oldItem != null && newItem != null) {
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diffCallback.areContentsTheSame(oldItem, newItem)
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} else if (oldItem == null && newItem == null) {
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true
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} else {
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throw AssertionError()
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}
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}
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override fun getChangePayload(
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oldItemPosition: Int,
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newItemPosition: Int
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): Any? {
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val oldItem: T? = oldList[oldItemPosition]
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val newItem: T? = newList[newItemPosition]
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return if (oldItem != null && newItem != null) {
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diffCallback.getChangePayload(oldItem, newItem)
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} else {
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throw AssertionError()
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}
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}
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})
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field = newList
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result.dispatchUpdatesTo(updateCallback)
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}
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/**
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* Submit a list like AsyncListDiffer. This is exceedingly slow for large diffs, so only use it
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* if the changes are trivial.
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* @param newList The list to update to.
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*/
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fun submitList(newList: List<T>) {
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if (newList == currentList) {
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// Nothing to do.
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return
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}
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currentList = newList
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}
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/**
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* Replace this list with a new list. This is good for large diffs that are too slow to update
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* synchronously, but too chaotic to update asynchronously.
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* @param newList The list to update to.
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*/
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fun replaceList(newList: List<T>) {
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if (newList == currentList) {
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// Nothing to do.
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return
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}
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currentList = emptyList()
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currentList = newList
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}
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}
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