#8 Configure sort order for each favourites category

app/build.gradle

@@ -70,19 +70,19 @@ dependencies {
 	implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.1'
 
 	implementation 'androidx.core:core-ktx:1.6.0'
-	implementation 'androidx.activity:activity-ktx:1.2.3'
+	implementation 'androidx.activity:activity-ktx:1.3.0'
-	implementation 'androidx.fragment:fragment-ktx:1.3.5'
+	implementation 'androidx.fragment:fragment-ktx:1.3.6'
 	implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
 	implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
 	implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.3.1'
 	implementation 'androidx.lifecycle:lifecycle-service:2.3.1'
 	implementation 'androidx.lifecycle:lifecycle-process:2.3.1'
-	implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+	implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
 	implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
 	implementation 'androidx.recyclerview:recyclerview:1.2.1'
 	implementation 'androidx.viewpager2:viewpager2:1.1.0-alpha01'
 	implementation 'androidx.preference:preference-ktx:1.1.1'
-	implementation 'androidx.work:work-runtime-ktx:2.6.0-beta01'
+	implementation 'androidx.work:work-runtime-ktx:2.6.0-beta02'
 	implementation 'com.google.android.material:material:1.4.0'
 	//noinspection LifecycleAnnotationProcessorWithJava8
 	kapt 'androidx.lifecycle:lifecycle-compiler:2.3.1'

app/src/main/java/org/koitharu/kotatsu/core/backup/BackupRepository.kt

@@ -118,6 +118,7 @@ class BackupRepository(private val db: MangaDatabase) {
 		jo.put("created_at", createdAt)
 		jo.put("sort_key", sortKey)
 		jo.put("title", title)
+		jo.put("order", order)
 		return jo
 	}
 

app/src/main/java/org/koitharu/kotatsu/core/backup/RestoreRepository.kt

@@ -5,6 +5,7 @@ import org.json.JSONObject
 import org.koitharu.kotatsu.core.db.MangaDatabase
 import org.koitharu.kotatsu.core.db.entity.MangaEntity
 import org.koitharu.kotatsu.core.db.entity.TagEntity
+import org.koitharu.kotatsu.core.model.SortOrder
 import org.koitharu.kotatsu.favourites.data.FavouriteCategoryEntity
 import org.koitharu.kotatsu.favourites.data.FavouriteEntity
 import org.koitharu.kotatsu.history.data.HistoryEntity
@@ -101,7 +102,8 @@ class RestoreRepository(private val db: MangaDatabase) {
 		categoryId = json.getInt("category_id"),
 		createdAt = json.getLong("created_at"),
 		sortKey = json.getInt("sort_key"),
-		title = json.getString("title")
+		title = json.getString("title"),
+		order = json.getStringOrNull("order") ?: SortOrder.NEWEST.name,
 	)
 
 	private fun parseFavourite(json: JSONObject) = FavouriteEntity(

app/src/main/java/org/koitharu/kotatsu/core/db/DatabaseModule.kt

@@ -20,6 +20,7 @@ val databaseModule
 				Migration5To6(),
 				Migration6To7(),
 				Migration7To8(),
+				Migration8To9(),
 			).addCallback(
 				DatabasePrePopulateCallback(androidContext().resources)
 			).build()

app/src/main/java/org/koitharu/kotatsu/core/db/MangaDatabase.kt

@@ -16,7 +16,7 @@ import org.koitharu.kotatsu.history.data.HistoryEntity
 		MangaEntity::class, TagEntity::class, HistoryEntity::class, MangaTagsEntity::class,
 		FavouriteCategoryEntity::class, FavouriteEntity::class, MangaPrefsEntity::class,
 		TrackEntity::class, TrackLogEntity::class, SuggestionEntity::class
-	], version = 8
+	], version = 9
 )
 abstract class MangaDatabase : RoomDatabase() {
 

app/src/main/java/org/koitharu/kotatsu/core/db/migrations/Migration8To9.kt

@@ -0,0 +1,12 @@
+package org.koitharu.kotatsu.core.db.migrations
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+import org.koitharu.kotatsu.core.model.SortOrder
+
+class Migration8To9 : Migration(8, 9) {
+
+	override fun migrate(database: SupportSQLiteDatabase) {
+		database.execSQL("ALTER TABLE favourite_categories ADD COLUMN `order` TEXT NOT NULL DEFAULT ${SortOrder.NEWEST.name}")
+	}
+}

app/src/main/java/org/koitharu/kotatsu/core/model/FavouriteCategory.kt

@@ -9,5 +9,6 @@ data class FavouriteCategory(
 	val id: Long,
 	val title: String,
 	val sortKey: Int,
-	val createdAt: Date
+	val order: SortOrder,
+	val createdAt: Date,
 ) : Parcelable

app/src/main/java/org/koitharu/kotatsu/favourites/data/FavouriteCategoriesDao.kt

@@ -2,7 +2,6 @@ package org.koitharu.kotatsu.favourites.data
 
 import androidx.room.*
 import kotlinx.coroutines.flow.Flow
-import org.koitharu.kotatsu.core.model.FavouriteCategory
 
 @Dao
 abstract class FavouriteCategoriesDao {
@@ -13,6 +12,9 @@ abstract class FavouriteCategoriesDao {
 	@Query("SELECT * FROM favourite_categories ORDER BY sort_key")
 	abstract fun observeAll(): Flow<List<FavouriteCategoryEntity>>
 
+	@Query("SELECT * FROM favourite_categories WHERE category_id = :id")
+	abstract fun observe(id: Long): Flow<FavouriteCategoryEntity>
+
 	@Insert(onConflict = OnConflictStrategy.ABORT)
 	abstract suspend fun insert(category: FavouriteCategoryEntity): Long
 
@@ -23,10 +25,13 @@ abstract class FavouriteCategoriesDao {
 	abstract suspend fun delete(id: Long)
 
 	@Query("UPDATE favourite_categories SET title = :title WHERE category_id = :id")
-	abstract suspend fun update(id: Long, title: String)
+	abstract suspend fun updateTitle(id: Long, title: String)
+
+	@Query("UPDATE favourite_categories SET `order` = :order WHERE category_id = :id")
+	abstract suspend fun updateOrder(id: Long, order: String)
 
 	@Query("UPDATE favourite_categories SET sort_key = :sortKey WHERE category_id = :id")
-	abstract suspend fun update(id: Long, sortKey: Int)
+	abstract suspend fun updateSortKey(id: Long, sortKey: Int)
 
 	@Query("SELECT MAX(sort_key) FROM favourite_categories")
 	protected abstract suspend fun getMaxSortKey(): Int?

app/src/main/java/org/koitharu/kotatsu/favourites/data/FavouriteCategoryEntity.kt

@@ -4,6 +4,7 @@ import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.PrimaryKey
 import org.koitharu.kotatsu.core.model.FavouriteCategory
+import org.koitharu.kotatsu.core.model.SortOrder
 import java.util.*
 
 @Entity(tableName = "favourite_categories")
@@ -12,13 +13,15 @@ data class FavouriteCategoryEntity(
 	@ColumnInfo(name = "category_id") val categoryId: Int,
 	@ColumnInfo(name = "created_at") val createdAt: Long,
 	@ColumnInfo(name = "sort_key") val sortKey: Int,
-	@ColumnInfo(name = "title") val title: String
+	@ColumnInfo(name = "title") val title: String,
+	@ColumnInfo(name = "order") val order: String,
 ) {
 
 	fun toFavouriteCategory(id: Long? = null) = FavouriteCategory(
 		id = id ?: categoryId.toLong(),
 		title = title,
 		sortKey = sortKey,
-		createdAt = Date(createdAt)
+		order = SortOrder.values().find { x -> x.name == order } ?: SortOrder.NEWEST,
+		createdAt = Date(createdAt),
 	)
 }

app/src/main/java/org/koitharu/kotatsu/favourites/data/FavouritesDao.kt

@@ -1,8 +1,11 @@
 package org.koitharu.kotatsu.favourites.data
 
 import androidx.room.*
+import androidx.sqlite.db.SimpleSQLiteQuery
+import androidx.sqlite.db.SupportSQLiteQuery
 import kotlinx.coroutines.flow.Flow
 import org.koitharu.kotatsu.core.db.entity.MangaEntity
+import org.koitharu.kotatsu.core.model.SortOrder
 
 @Dao
 abstract class FavouritesDao {
@@ -11,9 +14,13 @@ abstract class FavouritesDao {
 	@Query("SELECT * FROM favourites GROUP BY manga_id ORDER BY created_at DESC")
 	abstract suspend fun findAll(): List<FavouriteManga>
 
-	@Transaction
+	fun observeAll(order: SortOrder): Flow<List<FavouriteManga>> {
-	@Query("SELECT * FROM favourites GROUP BY manga_id ORDER BY created_at DESC")
+		val orderBy = getOrderBy(order)
-	abstract fun observeAll(): Flow<List<FavouriteManga>>
+		val query = SimpleSQLiteQuery(
+			"SELECT * FROM favourites LEFT JOIN manga ON favourites.manga_id = manga.manga_id GROUP BY favourites.manga_id ORDER BY $orderBy",
+		)
+		return observeAllRaw(query)
+	}
 
 	@Transaction
 	@Query("SELECT * FROM favourites GROUP BY manga_id ORDER BY created_at DESC LIMIT :limit OFFSET :offset")
@@ -23,9 +30,14 @@ abstract class FavouritesDao {
 	@Query("SELECT * FROM favourites WHERE category_id = :categoryId GROUP BY manga_id ORDER BY created_at DESC")
 	abstract suspend fun findAll(categoryId: Long): List<FavouriteManga>
 
-	@Transaction
+	fun observeAll(categoryId: Long, order: SortOrder): Flow<List<FavouriteManga>> {
-	@Query("SELECT * FROM favourites WHERE category_id = :categoryId GROUP BY manga_id ORDER BY created_at DESC")
+		val orderBy = getOrderBy(order)
-	abstract fun observeAll(categoryId: Long): Flow<List<FavouriteManga>>
+		val query = SimpleSQLiteQuery(
+			"SELECT * FROM favourites LEFT JOIN manga ON favourites.manga_id = manga.manga_id WHERE category_id = ? GROUP BY favourites.manga_id ORDER BY $orderBy",
+			arrayOf<Any>(categoryId),
+		)
+		return observeAllRaw(query)
+	}
 
 	@Transaction
 	@Query("SELECT * FROM favourites WHERE category_id = :categoryId GROUP BY manga_id ORDER BY created_at DESC LIMIT :limit OFFSET :offset")
@@ -63,4 +75,16 @@ abstract class FavouritesDao {
 			insert(entity)
 		}
 	}
+
+	@Transaction
+	@RawQuery(observedEntities = [FavouriteEntity::class])
+	protected abstract fun observeAllRaw(query: SupportSQLiteQuery): Flow<List<FavouriteManga>>
+
+	private fun getOrderBy(sortOrder: SortOrder) = when(sortOrder) {
+		SortOrder.RATING -> "rating DESC"
+		SortOrder.NEWEST,
+		SortOrder.UPDATED -> "created_at DESC"
+		SortOrder.ALPHABETICAL -> "title ASC"
+		else -> throw IllegalArgumentException("Sort order $sortOrder is not supported")
+	}
 }

app/src/main/java/org/koitharu/kotatsu/favourites/domain/FavouritesRepository.kt

@@ -3,12 +3,14 @@ package org.koitharu.kotatsu.favourites.domain
 import androidx.room.withTransaction
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.map
 import org.koitharu.kotatsu.core.db.MangaDatabase
 import org.koitharu.kotatsu.core.db.entity.MangaEntity
 import org.koitharu.kotatsu.core.db.entity.TagEntity
 import org.koitharu.kotatsu.core.model.FavouriteCategory
 import org.koitharu.kotatsu.core.model.Manga
+import org.koitharu.kotatsu.core.model.SortOrder
 import org.koitharu.kotatsu.favourites.data.FavouriteCategoryEntity
 import org.koitharu.kotatsu.favourites.data.FavouriteEntity
 import org.koitharu.kotatsu.utils.ext.mapItems
@@ -21,26 +23,26 @@ class FavouritesRepository(private val db: MangaDatabase) {
 		return entities.map { it.manga.toManga(it.tags.mapToSet(TagEntity::toMangaTag)) }
 	}
 
-	fun observeAll(): Flow<List<Manga>> {
+	fun observeAll(order: SortOrder): Flow<List<Manga>> {
-		return db.favouritesDao.observeAll()
+		return db.favouritesDao.observeAll(order)
 			.mapItems { it.manga.toManga(it.tags.mapToSet(TagEntity::toMangaTag)) }
 	}
 
-	suspend fun getAllManga(offset: Int): List<Manga> {
-		val entities = db.favouritesDao.findAll(offset, 20)
-		return entities.map { it.manga.toManga(it.tags.mapToSet(TagEntity::toMangaTag)) }
-	}
-
 	suspend fun getManga(categoryId: Long): List<Manga> {
 		val entities = db.favouritesDao.findAll(categoryId)
 		return entities.map { it.manga.toManga(it.tags.mapToSet(TagEntity::toMangaTag)) }
 	}
 
-	fun observeAll(categoryId: Long): Flow<List<Manga>> {
+	fun observeAll(categoryId: Long, order: SortOrder): Flow<List<Manga>> {
-		return db.favouritesDao.observeAll(categoryId)
+		return db.favouritesDao.observeAll(categoryId, order)
 			.mapItems { it.manga.toManga(it.tags.mapToSet(TagEntity::toMangaTag)) }
 	}
 
+	fun observeAll(categoryId: Long): Flow<List<Manga>> {
+		return observeOrder(categoryId)
+			.flatMapLatest { order -> observeAll(categoryId, order) }
+	}
+
 	suspend fun getManga(categoryId: Long, offset: Int): List<Manga> {
 		val entities = db.favouritesDao.findAll(categoryId, offset, 20)
 		return entities.map { it.manga.toManga(it.tags.mapToSet(TagEntity::toMangaTag)) }
@@ -77,25 +79,30 @@ class FavouritesRepository(private val db: MangaDatabase) {
 			title = title,
 			createdAt = System.currentTimeMillis(),
 			sortKey = db.favouriteCategoriesDao.getNextSortKey(),
-			categoryId = 0
+			categoryId = 0,
+			order = SortOrder.UPDATED.name,
 		)
 		val id = db.favouriteCategoriesDao.insert(entity)
 		return entity.toFavouriteCategory(id)
 	}
 
 	suspend fun renameCategory(id: Long, title: String) {
-		db.favouriteCategoriesDao.update(id, title)
+		db.favouriteCategoriesDao.updateTitle(id, title)
 	}
 
 	suspend fun removeCategory(id: Long) {
 		db.favouriteCategoriesDao.delete(id)
 	}
 
+	suspend fun setCategoryOrder(id: Long, order: SortOrder) {
+		db.favouriteCategoriesDao.updateOrder(id, order.name)
+	}
+
 	suspend fun reorderCategories(orderedIds: List<Long>) {
 		val dao = db.favouriteCategoriesDao
 		db.withTransaction {
 			for ((i, id) in orderedIds.withIndex()) {
-				dao.update(id, i)
+				dao.updateSortKey(id, i)
 			}
 		}
 	}
@@ -117,4 +124,10 @@ class FavouritesRepository(private val db: MangaDatabase) {
 	suspend fun removeFromFavourites(manga: Manga) {
 		db.favouritesDao.delete(manga.id)
 	}
+
+	private fun observeOrder(categoryId: Long): Flow<SortOrder> {
+		return db.favouriteCategoriesDao.observe(categoryId)
+			.map { x -> SortOrder.values().find { it.name == x.order } ?: SortOrder.NEWEST }
+			.distinctUntilChanged()
+	}
 }

app/src/main/java/org/koitharu/kotatsu/favourites/ui/FavouritesContainerFragment.kt

@@ -11,6 +11,7 @@ import org.koin.androidx.viewmodel.ext.android.viewModel
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseFragment
 import org.koitharu.kotatsu.core.model.FavouriteCategory
+import org.koitharu.kotatsu.core.model.SortOrder
 import org.koitharu.kotatsu.databinding.FragmentFavouritesBinding
 import org.koitharu.kotatsu.favourites.ui.categories.CategoriesActivity
 import org.koitharu.kotatsu.favourites.ui.categories.CategoriesEditDelegate
@@ -19,7 +20,6 @@ import org.koitharu.kotatsu.utils.RecycledViewPoolHolder
 import org.koitharu.kotatsu.utils.ext.getDisplayMessage
 import org.koitharu.kotatsu.utils.ext.showPopupMenu
 import java.util.*
-import kotlin.collections.ArrayList
 
 class FavouritesContainerFragment : BaseFragment<FragmentFavouritesBinding>(),
 	FavouritesTabLongClickListener, CategoriesEditDelegate.CategoriesEditCallback,
@@ -100,11 +100,19 @@ class FavouritesContainerFragment : BaseFragment<FragmentFavouritesBinding>(),
 
 	override fun onTabLongClick(tabView: View, category: FavouriteCategory): Boolean {
 		val menuRes = if (category.id == 0L) R.menu.popup_category_empty else R.menu.popup_category
-		tabView.showPopupMenu(menuRes) {
+		tabView.showPopupMenu(menuRes, { menu ->
+			createOrderSubmenu(menu, category)
+		}) {
 			when (it.itemId) {
 				R.id.action_remove -> editDelegate.deleteCategory(category)
 				R.id.action_rename -> editDelegate.renameCategory(category)
 				R.id.action_create -> editDelegate.createCategory()
+				R.id.action_order -> return@showPopupMenu false
+				else -> {
+					val order = CategoriesActivity.SORT_ORDERS.getOrNull(it.order)
+						?: return@showPopupMenu false
+					viewModel.setCategoryOrder(category.id, order)
+				}
 			}
 			true
 		}
@@ -125,11 +133,26 @@ class FavouritesContainerFragment : BaseFragment<FragmentFavouritesBinding>(),
 
 	private fun wrapCategories(categories: List<FavouriteCategory>): List<FavouriteCategory> {
 		val data = ArrayList<FavouriteCategory>(categories.size + 1)
-		data += FavouriteCategory(0L, getString(R.string.all_favourites), -1, Date())
+		data += FavouriteCategory(0L, getString(R.string.all_favourites), -1, SortOrder.NEWEST, Date())
 		data += categories
 		return data
 	}
 
+	private fun createOrderSubmenu(menu: Menu, category: FavouriteCategory) {
+		val submenu = menu.findItem(R.id.action_order)?.subMenu ?: return
+		for ((i, item) in CategoriesActivity.SORT_ORDERS.withIndex()) {
+			val menuItem = submenu.add(
+				R.id.group_order,
+				Menu.NONE,
+				i,
+				item.titleRes
+			)
+			menuItem.isCheckable = true
+			menuItem.isChecked = item == category.order
+		}
+		submenu.setGroupCheckable(R.id.group_order, true, true)
+	}
+
 	companion object {
 
 		fun newInstance() = FavouritesContainerFragment()

app/src/main/java/org/koitharu/kotatsu/favourites/ui/FavouritesPagerAdapter.kt

@@ -36,7 +36,7 @@ class FavouritesPagerAdapter(
 	override fun onConfigureTab(tab: TabLayout.Tab, position: Int) {
 		val item = differ.currentList[position]
 		tab.text = item.title
-		tab.view.tag = item
+		tab.view.tag = item.id
 		tab.view.setOnLongClickListener(this)
 	}
 
@@ -45,7 +45,8 @@ class FavouritesPagerAdapter(
 	}
 
 	override fun onLongClick(v: View): Boolean {
-		val item = v.tag as? FavouriteCategory ?: return false
+		val itemId = v.tag as? Long ?: return false
+		val item = differ.currentList.find { x -> x.id == itemId } ?: return false
 		return longClickListener.onTabLongClick(v, item)
 	}
 

app/src/main/java/org/koitharu/kotatsu/favourites/ui/categories/CategoriesActivity.kt

@@ -5,6 +5,7 @@ import android.content.Intent
 import android.content.res.ColorStateList
 import android.graphics.Color
 import android.os.Bundle
+import android.view.Menu
 import android.view.View
 import android.view.ViewGroup
 import androidx.core.graphics.Insets
@@ -20,6 +21,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseActivity
 import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.core.model.FavouriteCategory
+import org.koitharu.kotatsu.core.model.SortOrder
 import org.koitharu.kotatsu.databinding.ActivityCategoriesBinding
 import org.koitharu.kotatsu.utils.ext.getDisplayMessage
 import org.koitharu.kotatsu.utils.ext.showPopupMenu
@@ -61,10 +63,17 @@ class CategoriesActivity : BaseActivity<ActivityCategoriesBinding>(),
 	}
 
 	override fun onItemClick(item: FavouriteCategory, view: View) {
-		view.showPopupMenu(R.menu.popup_category) {
+		view.showPopupMenu(R.menu.popup_category, { menu ->
+			createOrderSubmenu(menu, item)
+		}) {
 			when (it.itemId) {
 				R.id.action_remove -> editDelegate.deleteCategory(item)
 				R.id.action_rename -> editDelegate.renameCategory(item)
+				R.id.action_order -> return@showPopupMenu false
+				else -> {
+					val order = SORT_ORDERS.getOrNull(it.order) ?: return@showPopupMenu false
+					viewModel.setCategoryOrder(item.id, order)
+				}
 			}
 			true
 		}
@@ -117,6 +126,21 @@ class CategoriesActivity : BaseActivity<ActivityCategoriesBinding>(),
 		viewModel.createCategory(name)
 	}
 
+	private fun createOrderSubmenu(menu: Menu, category: FavouriteCategory) {
+		val submenu = menu.findItem(R.id.action_order)?.subMenu ?: return
+		for ((i, item) in SORT_ORDERS.withIndex()) {
+			val menuItem = submenu.add(
+				R.id.group_order,
+				Menu.NONE,
+				i,
+				item.titleRes
+			)
+			menuItem.isCheckable = true
+			menuItem.isChecked = item == category.order
+		}
+		submenu.setGroupCheckable(R.id.group_order, true, true)
+	}
+
 	private inner class ReorderHelperCallback : ItemTouchHelper.SimpleCallback(
 		ItemTouchHelper.DOWN or ItemTouchHelper.UP, 0
 	) {
@@ -145,6 +169,12 @@ class CategoriesActivity : BaseActivity<ActivityCategoriesBinding>(),
 
 	companion object {
 
+		val SORT_ORDERS = arrayOf(
+			SortOrder.ALPHABETICAL,
+			SortOrder.NEWEST,
+			SortOrder.RATING,
+		)
+
 		fun newIntent(context: Context) = Intent(context, CategoriesActivity::class.java)
 	}
 }

app/src/main/java/org/koitharu/kotatsu/favourites/ui/categories/CategoriesAdapter.kt

@@ -6,7 +6,7 @@ import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.core.model.FavouriteCategory
 
 class CategoriesAdapter(
-	onItemClickListener: OnListItemClickListener<FavouriteCategory>
+	onItemClickListener: OnListItemClickListener<FavouriteCategory>,
 ) : AsyncListDifferDelegationAdapter<FavouriteCategory>(DiffCallback()) {
 
 	init {
@@ -20,12 +20,27 @@ class CategoriesAdapter(
 
 	private class DiffCallback : DiffUtil.ItemCallback<FavouriteCategory>() {
 
-		override fun areItemsTheSame(oldItem: FavouriteCategory, newItem: FavouriteCategory): Boolean {
+		override fun areItemsTheSame(
+			oldItem: FavouriteCategory,
+			newItem: FavouriteCategory,
+		): Boolean {
 			return oldItem.id == newItem.id
 		}
 
-		override fun areContentsTheSame(oldItem: FavouriteCategory, newItem: FavouriteCategory): Boolean {
+		override fun areContentsTheSame(
+			oldItem: FavouriteCategory,
+			newItem: FavouriteCategory,
+		): Boolean {
 			return oldItem.id == newItem.id && oldItem.title == newItem.title
+					&& oldItem.order == newItem.order
+		}
+
+		override fun getChangePayload(
+			oldItem: FavouriteCategory,
+			newItem: FavouriteCategory,
+		): Any? = when {
+			oldItem.title == newItem.title && oldItem.order != newItem.order -> newItem.order
+			else -> super.getChangePayload(oldItem, newItem)
 		}
 	}
 }

app/src/main/java/org/koitharu/kotatsu/favourites/ui/categories/FavouritesCategoriesViewModel.kt

@@ -4,10 +4,10 @@ import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import org.koitharu.kotatsu.base.ui.BaseViewModel
+import org.koitharu.kotatsu.core.model.SortOrder
 import org.koitharu.kotatsu.favourites.domain.FavouritesRepository
 import org.koitharu.kotatsu.utils.ext.asLiveDataDistinct
 import java.util.*
-import kotlin.collections.ArrayList
 
 class FavouritesCategoriesViewModel(
 	private val repository: FavouritesRepository
@@ -19,23 +19,29 @@ class FavouritesCategoriesViewModel(
 		.asLiveDataDistinct(viewModelScope.coroutineContext + Dispatchers.Default)
 
 	fun createCategory(name: String) {
-		launchJob(Dispatchers.Default) {
+		launchJob {
 			repository.addCategory(name)
 		}
 	}
 
 	fun renameCategory(id: Long, name: String) {
-		launchJob(Dispatchers.Default) {
+		launchJob {
 			repository.renameCategory(id, name)
 		}
 	}
 
 	fun deleteCategory(id: Long) {
-		launchJob(Dispatchers.Default) {
+		launchJob {
 			repository.removeCategory(id)
 		}
 	}
 
+	fun setCategoryOrder(id: Long, order: SortOrder) {
+		launchJob {
+			repository.setCategoryOrder(id, order)
+		}
+	}
+
 	fun reorderCategories(oldPos: Int, newPos: Int) {
 		val prevJob = reorderJob
 		reorderJob = launchJob(Dispatchers.Default) {

app/src/main/java/org/koitharu/kotatsu/favourites/ui/list/FavouritesListViewModel.kt

@@ -6,6 +6,7 @@ import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.combine
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.model.Manga
+import org.koitharu.kotatsu.core.model.SortOrder
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.favourites.domain.FavouritesRepository
 import org.koitharu.kotatsu.list.ui.MangaListViewModel
@@ -22,7 +23,11 @@ class FavouritesListViewModel(
 ) : MangaListViewModel(settings) {
 
 	override val content = combine(
-		if (categoryId == 0L) repository.observeAll() else repository.observeAll(categoryId),
+		if (categoryId == 0L) {
+			repository.observeAll(SortOrder.NEWEST)
+		} else {
+			repository.observeAll(categoryId)
+		},
 		createListModeFlow()
 	) { list, mode ->
 		when {

app/src/main/java/org/koitharu/kotatsu/widget/WidgetUpdater.kt

@@ -8,6 +8,7 @@ import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.flow.retry
+import org.koitharu.kotatsu.core.model.SortOrder
 import org.koitharu.kotatsu.favourites.domain.FavouritesRepository
 import org.koitharu.kotatsu.history.domain.HistoryRepository
 import org.koitharu.kotatsu.utils.ext.processLifecycleScope
@@ -17,7 +18,7 @@ import org.koitharu.kotatsu.widget.shelf.ShelfWidgetProvider
 class WidgetUpdater(private val context: Context) {
 
 	fun subscribeToFavourites(repository: FavouritesRepository) {
-		repository.observeAll()
+		repository.observeAll(SortOrder.NEWEST)
 			.onEach { updateWidget(ShelfWidgetProvider::class.java) }
 			.retry { error -> error !is CancellationException }
 			.launchIn(processLifecycleScope)

app/src/main/res/menu/popup_category.xml

@@ -10,4 +10,17 @@
 		android:id="@+id/action_rename"
 		android:title="@string/rename" />
 
+	<item
+		android:id="@+id/action_order"
+		android:title="@string/sort_order">
+
+		<menu>
+
+			<group
+				android:id="@+id/group_order"
+				android:checkableBehavior="single" />
+		</menu>
+
+	</item>
+
 </menu>