/
AssemblyLoadStateFragmentStateAdapter.kt
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/
AssemblyLoadStateFragmentStateAdapter.kt
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/*
* Copyright (C) 2021 panpf <panpfpanpf@outlook.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.github.panpf.assemblyadapter.pager2.paging
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentActivity
import androidx.fragment.app.FragmentManager
import androidx.lifecycle.Lifecycle
import androidx.paging.LoadState
import androidx.recyclerview.widget.ConcatAdapter
import androidx.recyclerview.widget.RecyclerView
import com.github.panpf.assemblyadapter.AssemblyAdapter
import com.github.panpf.assemblyadapter.internal.ItemFactoryStorage
import com.github.panpf.assemblyadapter.pager.FragmentItemFactory
import com.github.panpf.assemblyadapter.recycler.ConcatAdapterAbsoluteHelper
/**
* An implementation of [LoadStateFragmentStateAdapter], Realize the display of [LoadState] through standardized [FragmentItemFactory].
*
* @param itemFactory Must be a [FragmentItemFactory] that can match [LoadState]
* @param alwaysShowWhenEndOfPaginationReached If true, it will still be displayed at the end of pagination reached
*/
open class AssemblyLoadStateFragmentStateAdapter(
fragmentManager: FragmentManager,
lifecycle: Lifecycle,
itemFactory: FragmentItemFactory<LoadState>,
private val alwaysShowWhenEndOfPaginationReached: Boolean = false,
) : LoadStateFragmentStateAdapter(fragmentManager, lifecycle),
AssemblyAdapter<LoadState, FragmentItemFactory<out Any>> {
private var recyclerView: RecyclerView? = null
private val concatAdapterAbsoluteHelper = ConcatAdapterAbsoluteHelper()
private val itemFactoryStorage = ItemFactoryStorage<FragmentItemFactory<out Any>>(
listOf(itemFactory),
"FragmentItemFactory",
"AssemblyLoadStateFragmentStateAdapter",
"itemFactory"
)
/**
* Get [FragmentManager] and [Lifecycle] from [FragmentActivity] to create [AssemblyLoadStateFragmentStateAdapter]
*
* @param itemFactory Must be a [FragmentItemFactory] that can match [LoadState]
* @param alwaysShowWhenEndOfPaginationReached If true, it will still be displayed at the end of pagination reached
*/
constructor(
fragmentActivity: FragmentActivity,
itemFactory: FragmentItemFactory<LoadState>,
alwaysShowWhenEndOfPaginationReached: Boolean = false,
) : this(
fragmentActivity.supportFragmentManager,
fragmentActivity.lifecycle,
itemFactory,
alwaysShowWhenEndOfPaginationReached
)
/**
* Get [FragmentManager] and [Lifecycle] from [Fragment] to create [AssemblyLoadStateFragmentStateAdapter]
*
* @param itemFactory Must be a [FragmentItemFactory] that can match [LoadState]
* @param alwaysShowWhenEndOfPaginationReached If true, it will still be displayed at the end of pagination reached
*/
constructor(
fragment: Fragment,
itemFactory: FragmentItemFactory<LoadState>,
alwaysShowWhenEndOfPaginationReached: Boolean = false,
) : this(
fragment.childFragmentManager,
fragment.lifecycle,
itemFactory,
alwaysShowWhenEndOfPaginationReached
)
fun getItemData(position: Int): LoadState {
val count = itemCount
if (position < 0 || position >= count) {
throw IndexOutOfBoundsException("Index: $position, Size: $count")
}
return loadState
}
override fun displayLoadStateAsItem(loadState: LoadState): Boolean {
return loadState is LoadState.Loading
|| loadState is LoadState.Error
|| (alwaysShowWhenEndOfPaginationReached && loadState is LoadState.NotLoading && loadState.endOfPaginationReached)
}
override fun onCreateFragment(position: Int, loadState: LoadState): Fragment {
val data = getItemData(position)
@Suppress("UnnecessaryVariable") val bindingAdapterPosition = position
val parentAdapter = recyclerView?.adapter
val absoluteAdapterPosition = if (parentAdapter is ConcatAdapter) {
concatAdapterAbsoluteHelper.findAbsoluteAdapterPosition(parentAdapter, this, position)
} else {
bindingAdapterPosition
}
val itemFactory =
itemFactoryStorage.getItemFactoryByData(loadState) as FragmentItemFactory<Any>
return itemFactory.dispatchCreateFragment(
bindingAdapterPosition, absoluteAdapterPosition, data
)
}
override fun getItemFactoryByPosition(position: Int): FragmentItemFactory<Any> {
val data = getItemData(position)
return itemFactoryStorage.getItemFactoryByData(data) as FragmentItemFactory<Any>
}
override fun getItemFactoryByData(data: LoadState): FragmentItemFactory<Any> {
return itemFactoryStorage.getItemFactoryByData(data) as FragmentItemFactory<Any>
}
override fun <T : FragmentItemFactory<out Any>> getItemFactoryByClass(itemFactoryClass: Class<T>): T {
return itemFactoryStorage.getItemFactoryByClass(itemFactoryClass)
}
override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {
super.onAttachedToRecyclerView(recyclerView)
this.recyclerView = recyclerView
}
override fun onDetachedFromRecyclerView(recyclerView: RecyclerView) {
super.onDetachedFromRecyclerView(recyclerView)
this.recyclerView = null
}
}