Favourites container fixes

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/BaseListAdapter.kt

@@ -1,8 +1,11 @@
 package org.koitharu.kotatsu.core.ui
 
+import androidx.recyclerview.widget.AsyncDifferConfig
 import androidx.recyclerview.widget.AsyncListDiffer.ListListener
 import com.hannesdorfmann.adapterdelegates4.AdapterDelegate
 import com.hannesdorfmann.adapterdelegates4.AsyncListDifferDelegationAdapter
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.asExecutor
 import kotlinx.coroutines.flow.FlowCollector
 import org.koitharu.kotatsu.core.util.ContinuationResumeRunnable
 import org.koitharu.kotatsu.list.ui.ListModelDiffCallback
@@ -11,8 +14,12 @@ import kotlin.coroutines.suspendCoroutine
 
 open class BaseListAdapter(
 	vararg delegates: AdapterDelegate<List<ListModel>>,
-) : AsyncListDifferDelegationAdapter<ListModel>(ListModelDiffCallback, *delegates),
-	FlowCollector<List<ListModel>> {
+) : AsyncListDifferDelegationAdapter<ListModel>(
+	AsyncDifferConfig.Builder(ListModelDiffCallback)
+		.setBackgroundThreadExecutor(Dispatchers.Default.limitedParallelism(2).asExecutor())
+		.build(),
+	*delegates,
+), FlowCollector<List<ListModel>> {
 
 	override suspend fun emit(value: List<ListModel>) = suspendCoroutine { cont ->
 		setItems(value, ContinuationResumeRunnable(cont))

app/src/main/kotlin/org/koitharu/kotatsu/favourites/ui/container/FavouriteTabModel.kt

@@ -0,0 +1,29 @@
+package org.koitharu.kotatsu.favourites.ui.container
+
+import org.koitharu.kotatsu.list.ui.model.ListModel
+
+class FavouriteTabModel(
+	val id: Long,
+	val title: String,
+) : ListModel {
+
+	override fun areItemsTheSame(other: ListModel): Boolean {
+		return other is FavouriteTabModel && other.id == id
+	}
+
+	override fun equals(other: Any?): Boolean {
+		if (this === other) return true
+		if (javaClass != other?.javaClass) return false
+
+		other as FavouriteTabModel
+
+		if (id != other.id) return false
+		return title == other.title
+	}
+
+	override fun hashCode(): Int {
+		var result = id.hashCode()
+		result = 31 * result + title.hashCode()
+		return result
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/favourites/ui/container/FavouritesContainerAdapter.kt

@@ -1,25 +1,31 @@
 package org.koitharu.kotatsu.favourites.ui.container
 
 import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.AdapterListUpdateCallback
+import androidx.recyclerview.widget.AsyncDifferConfig
 import androidx.recyclerview.widget.AsyncListDiffer
 import androidx.recyclerview.widget.DiffUtil
 import androidx.viewpager2.adapter.FragmentStateAdapter
 import com.google.android.material.tabs.TabLayout
 import com.google.android.material.tabs.TabLayoutMediator.TabConfigurationStrategy
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.asExecutor
 import kotlinx.coroutines.flow.FlowCollector
-import org.koitharu.kotatsu.core.model.FavouriteCategory
 import org.koitharu.kotatsu.core.util.ContinuationResumeRunnable
 import org.koitharu.kotatsu.favourites.ui.list.FavouritesListFragment
 import kotlin.coroutines.suspendCoroutine
 
-class FavouritesContainerAdapter(fragment: Fragment) : FragmentStateAdapter(
-	fragment.childFragmentManager,
-	fragment.viewLifecycleOwner.lifecycle,
-),
+class FavouritesContainerAdapter(fragment: Fragment) :
+	FragmentStateAdapter(fragment.childFragmentManager, fragment.viewLifecycleOwner.lifecycle),
 	TabConfigurationStrategy,
-	FlowCollector<List<FavouriteCategory>> {
+	FlowCollector<List<FavouriteTabModel>> {
 
-	private val differ = AsyncListDiffer(this, DiffCallback())
+	private val differ = AsyncListDiffer(
+		AdapterListUpdateCallback(this),
+		AsyncDifferConfig.Builder(DiffCallback())
+			.setBackgroundThreadExecutor(Dispatchers.Default.limitedParallelism(2).asExecutor())
+			.build(),
+	)
 
 	override fun getItemCount(): Int = differ.currentList.size
 
@@ -27,8 +33,13 @@ class FavouritesContainerAdapter(fragment: Fragment) : FragmentStateAdapter(
 		return differ.currentList[position].id
 	}
 
+	override fun containsItem(itemId: Long): Boolean {
+		return differ.currentList.any { x -> x.id == itemId }
+	}
+
 	override fun createFragment(position: Int): Fragment {
-		return FavouritesListFragment.newInstance(getItemId(position))
+		val item = differ.currentList[position]
+		return FavouritesListFragment.newInstance(item.id)
 	}
 
 	override fun onConfigureTab(tab: TabLayout.Tab, position: Int) {
@@ -37,18 +48,18 @@ class FavouritesContainerAdapter(fragment: Fragment) : FragmentStateAdapter(
 		tab.tag = item
 	}
 
-	override suspend fun emit(value: List<FavouriteCategory>) = suspendCoroutine { cont ->
+	override suspend fun emit(value: List<FavouriteTabModel>) = suspendCoroutine { cont ->
 		differ.submitList(value, ContinuationResumeRunnable(cont))
 	}
 
-	private class DiffCallback : DiffUtil.ItemCallback<FavouriteCategory>() {
+	private class DiffCallback : DiffUtil.ItemCallback<FavouriteTabModel>() {
 
-		override fun areItemsTheSame(oldItem: FavouriteCategory, newItem: FavouriteCategory): Boolean {
+		override fun areItemsTheSame(oldItem: FavouriteTabModel, newItem: FavouriteTabModel): Boolean {
 			return oldItem.id == newItem.id
 		}
 
-		override fun areContentsTheSame(oldItem: FavouriteCategory, newItem: FavouriteCategory): Boolean {
-			return oldItem.title == newItem.title
+		override fun areContentsTheSame(oldItem: FavouriteTabModel, newItem: FavouriteTabModel): Boolean {
+			return oldItem == newItem
 		}
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/favourites/ui/container/FavouritesContainerViewModel.kt

@@ -1,7 +1,13 @@
 package org.koitharu.kotatsu.favourites.ui.container
 
+import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.plus
 import org.koitharu.kotatsu.core.ui.BaseViewModel
+import org.koitharu.kotatsu.core.util.ext.mapItems
 import org.koitharu.kotatsu.favourites.domain.FavouritesRepository
 import javax.inject.Inject
 
@@ -11,4 +17,6 @@ class FavouritesContainerViewModel @Inject constructor(
 ) : BaseViewModel() {
 
 	val categories = favouritesRepository.observeCategories()
+		.mapItems { FavouriteTabModel(it.id, it.title) }
+		.stateIn(viewModelScope + Dispatchers.Default, SharingStarted.Eagerly, emptyList())
 }

app/src/main/kotlin/org/koitharu/kotatsu/list/ui/MangaListFragment.kt

@@ -76,9 +76,6 @@ abstract class MangaListFragment :
 	private var selectionController: ListSelectionController? = null
 	private var spanResolver: MangaListSpanResolver? = null
 	private val spanSizeLookup = SpanSizeLookup()
-	private val listCommitCallback = Runnable {
-		spanSizeLookup.invalidateCache()
-	}
 	open val isSwipeRefreshEnabled = true
 
 	protected abstract val viewModel: MangaListViewModel
@@ -166,8 +163,9 @@ abstract class MangaListFragment :
 		viewModel.onRefresh()
 	}
 
-	private fun onListChanged(list: List<ListModel>) {
-		listAdapter?.setItems(list, listCommitCallback)
+	private suspend fun onListChanged(list: List<ListModel>) {
+		listAdapter?.emit(list)
+		spanSizeLookup.invalidateCache()
 	}
 
 	private fun resolveException(e: Throwable) {
@@ -341,8 +339,7 @@ abstract class MangaListFragment :
 		}
 
 		override fun getSpanSize(position: Int): Int {
-			val total =
-				(requireViewBinding().recyclerView.layoutManager as? GridLayoutManager)?.spanCount ?: return 1
+			val total = (viewBinding?.recyclerView?.layoutManager as? GridLayoutManager)?.spanCount ?: return 1
 			return when (listAdapter?.getItemViewType(position)) {
 				ITEM_TYPE_MANGA_GRID -> 1
 				else -> total

app/src/main/res/layout/fragment_favourites_container.xml

@@ -1,31 +1,21 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.coordinatorlayout.widget.CoordinatorLayout
+<LinearLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	android:layout_width="match_parent"
-	android:layout_height="match_parent">
+	android:layout_height="match_parent"
+	android:orientation="vertical">
 
-	<com.google.android.material.appbar.AppBarLayout
-		android:id="@+id/appbar"
+	<com.google.android.material.tabs.TabLayout
+		android:id="@+id/tabs"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:elevation="0dp"
-		app:elevation="0dp"
-		app:liftOnScroll="false">
-
-		<com.google.android.material.tabs.TabLayout
-			android:id="@+id/tabs"
-			android:layout_width="match_parent"
-			android:layout_height="wrap_content"
-			app:tabGravity="start"
-			app:tabMode="scrollable" />
-
-	</com.google.android.material.appbar.AppBarLayout>
+		app:tabGravity="start"
+		app:tabMode="scrollable" />
 
 	<androidx.viewpager2.widget.ViewPager2
 		android:id="@+id/pager"
 		android:layout_width="match_parent"
-		android:layout_height="match_parent"
-		app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior" />
+		android:layout_height="match_parent" />
 
-</androidx.coordinatorlayout.widget.CoordinatorLayout>
+</LinearLayout>