Use Compose for Category screen (#7454)

* Use Compose for Category screen

* Use correct string for CategoryRenameDialog title

Co-authored-by: AntsyLich <[email protected]>

Co-authored-by: AntsyLich <[email protected]>

app/src/main/java/eu/kanade/data/category/CategoryRepositoryImpl.kt

@@ -4,7 +4,7 @@ import eu.kanade.data.DatabaseHandler
 import eu.kanade.domain.category.model.Category
 import eu.kanade.domain.category.model.CategoryUpdate
 import eu.kanade.domain.category.repository.CategoryRepository
-import eu.kanade.domain.category.repository.DuplicateNameException
+import eu.kanade.tachiyomi.Database
 import kotlinx.coroutines.flow.Flow
 
 class CategoryRepositoryImpl(
@@ -31,31 +31,39 @@ class CategoryRepositoryImpl(
         }
     }
 
-    @Throws(DuplicateNameException::class)
-    override suspend fun insert(name: String, order: Long) {
-        if (checkDuplicateName(name)) throw DuplicateNameException(name)
+    override suspend fun insert(category: Category) {
         handler.await {
             categoriesQueries.insert(
-                name = name,
-                order = order,
-                flags = 0L,
+                name = category.name,
+                order = category.order,
+                flags = category.flags,
             )
         }
     }
 
-    @Throws(DuplicateNameException::class)
-    override suspend fun update(payload: CategoryUpdate) {
-        if (payload.name != null && checkDuplicateName(payload.name)) throw DuplicateNameException(payload.name)
+    override suspend fun updatePartial(update: CategoryUpdate) {
         handler.await {
-            categoriesQueries.update(
-                name = payload.name,
-                order = payload.order,
-                flags = payload.flags,
-                categoryId = payload.id,
-            )
+            updatePartialBlocking(update)
+        }
+    }
+
+    override suspend fun updatePartial(updates: List<CategoryUpdate>) {
+        handler.await(true) {
+            for (update in updates) {
+                updatePartialBlocking(update)
+            }
         }
     }
 
+    private fun Database.updatePartialBlocking(update: CategoryUpdate) {
+        categoriesQueries.update(
+            name = update.name,
+            order = update.order,
+            flags = update.flags,
+            categoryId = update.id,
+        )
+    }
+
     override suspend fun delete(categoryId: Long) {
         handler.await {
             categoriesQueries.delete(
@@ -63,10 +71,4 @@ class CategoryRepositoryImpl(
             )
         }
     }
-
-    override suspend fun checkDuplicateName(name: String): Boolean {
-        return handler
-            .awaitList { categoriesQueries.getCategories() }
-            .any { it.name == name }
-    }
 }

app/src/main/java/eu/kanade/domain/DomainModule.kt

@@ -6,9 +6,11 @@ import eu.kanade.data.history.HistoryRepositoryImpl
 import eu.kanade.data.manga.MangaRepositoryImpl
 import eu.kanade.data.source.SourceRepositoryImpl
 import eu.kanade.data.track.TrackRepositoryImpl
+import eu.kanade.domain.category.interactor.CreateCategoryWithName
 import eu.kanade.domain.category.interactor.DeleteCategory
 import eu.kanade.domain.category.interactor.GetCategories
-import eu.kanade.domain.category.interactor.InsertCategory
+import eu.kanade.domain.category.interactor.RenameCategory
+import eu.kanade.domain.category.interactor.ReorderCategory
 import eu.kanade.domain.category.interactor.SetMangaCategories
 import eu.kanade.domain.category.interactor.UpdateCategory
 import eu.kanade.domain.category.repository.CategoryRepository
@@ -69,7 +71,9 @@ class DomainModule : InjektModule {
     override fun InjektRegistrar.registerInjectables() {
         addSingletonFactory<CategoryRepository> { CategoryRepositoryImpl(get()) }
         addFactory { GetCategories(get()) }
-        addFactory { InsertCategory(get()) }
+        addFactory { CreateCategoryWithName(get()) }
+        addFactory { RenameCategory(get()) }
+        addFactory { ReorderCategory(get()) }
         addFactory { UpdateCategory(get()) }
         addFactory { DeleteCategory(get()) }
 

app/src/main/java/eu/kanade/domain/category/interactor/CreateCategoryWithName.kt

@@ -0,0 +1,43 @@
+package eu.kanade.domain.category.interactor
+
+import eu.kanade.domain.category.model.Category
+import eu.kanade.domain.category.model.anyWithName
+import eu.kanade.domain.category.repository.CategoryRepository
+import eu.kanade.tachiyomi.util.system.logcat
+import kotlinx.coroutines.NonCancellable
+import kotlinx.coroutines.withContext
+import logcat.LogPriority
+
+class CreateCategoryWithName(
+    private val categoryRepository: CategoryRepository,
+) {
+
+    suspend fun await(name: String): Result = withContext(NonCancellable) await@{
+        val categories = categoryRepository.getAll()
+        if (categories.anyWithName(name)) {
+            return@await Result.NameAlreadyExistsError
+        }
+
+        val nextOrder = categories.maxOfOrNull { it.order }?.plus(1) ?: 0
+        val newCategory = Category(
+            id = 0,
+            name = name,
+            order = nextOrder,
+            flags = 0,
+        )
+
+        try {
+            categoryRepository.insert(newCategory)
+            Result.Success
+        } catch (e: Exception) {
+            logcat(LogPriority.ERROR, e)
+            Result.InternalError(e)
+        }
+    }
+
+    sealed class Result {
+        object Success : Result()
+        object NameAlreadyExistsError : Result()
+        data class InternalError(val error: Throwable) : Result()
+    }
+}

app/src/main/java/eu/kanade/domain/category/interactor/DeleteCategory.kt

@@ -1,12 +1,43 @@
 package eu.kanade.domain.category.interactor
 
+import eu.kanade.domain.category.model.CategoryUpdate
 import eu.kanade.domain.category.repository.CategoryRepository
+import eu.kanade.tachiyomi.util.system.logcat
+import kotlinx.coroutines.NonCancellable
+import kotlinx.coroutines.withContext
+import logcat.LogPriority
 
 class DeleteCategory(
     private val categoryRepository: CategoryRepository,
 ) {
 
-    suspend fun await(categoryId: Long) {
-        categoryRepository.delete(categoryId)
+    suspend fun await(categoryId: Long) = withContext(NonCancellable) await@{
+        try {
+            categoryRepository.delete(categoryId)
+        } catch (e: Exception) {
+            logcat(LogPriority.ERROR, e)
+            return@await Result.InternalError(e)
+        }
+
+        val categories = categoryRepository.getAll()
+        val updates = categories.mapIndexed { index, category ->
+            CategoryUpdate(
+                id = category.id,
+                order = index.toLong(),
+            )
+        }
+
+        try {
+            categoryRepository.updatePartial(updates)
+            Result.Success
+        } catch (e: Exception) {
+            logcat(LogPriority.ERROR, e)
+            Result.InternalError(e)
+        }
+    }
+
+    sealed class Result {
+        object Success : Result()
+        data class InternalError(val error: Throwable) : Result()
     }
 }

app/src/main/java/eu/kanade/domain/category/interactor/InsertCategory.kt

@@ -1,22 +0,0 @@
-package eu.kanade.domain.category.interactor
-
-import eu.kanade.domain.category.repository.CategoryRepository
-
-class InsertCategory(
-    private val categoryRepository: CategoryRepository,
-) {
-
-    suspend fun await(name: String, order: Long): Result {
-        return try {
-            categoryRepository.insert(name, order)
-            Result.Success
-        } catch (e: Exception) {
-            Result.Error(e)
-        }
-    }
-
-    sealed class Result {
-        object Success : Result()
-        data class Error(val error: Exception) : Result()
-    }
-}

app/src/main/java/eu/kanade/domain/category/interactor/RenameCategory.kt

@@ -0,0 +1,43 @@
+package eu.kanade.domain.category.interactor
+
+import eu.kanade.domain.category.model.Category
+import eu.kanade.domain.category.model.CategoryUpdate
+import eu.kanade.domain.category.model.anyWithName
+import eu.kanade.domain.category.repository.CategoryRepository
+import eu.kanade.tachiyomi.util.system.logcat
+import kotlinx.coroutines.NonCancellable
+import kotlinx.coroutines.withContext
+import logcat.LogPriority
+
+class RenameCategory(
+    private val categoryRepository: CategoryRepository,
+) {
+
+    suspend fun await(categoryId: Long, name: String) = withContext(NonCancellable) await@{
+        val categories = categoryRepository.getAll()
+        if (categories.anyWithName(name)) {
+            return@await Result.NameAlreadyExistsError
+        }
+
+        val update = CategoryUpdate(
+            id = categoryId,
+            name = name,
+        )
+
+        try {
+            categoryRepository.updatePartial(update)
+            Result.Success
+        } catch (e: Exception) {
+            logcat(LogPriority.ERROR, e)
+            Result.InternalError(e)
+        }
+    }
+
+    suspend fun await(category: Category, name: String) = await(category.id, name)
+
+    sealed class Result {
+        object Success : Result()
+        object NameAlreadyExistsError : Result()
+        data class InternalError(val error: Throwable) : Result()
+    }
+}

app/src/main/java/eu/kanade/domain/category/interactor/ReorderCategory.kt

@@ -0,0 +1,51 @@
+package eu.kanade.domain.category.interactor
+
+import eu.kanade.domain.category.model.Category
+import eu.kanade.domain.category.model.CategoryUpdate
+import eu.kanade.domain.category.repository.CategoryRepository
+import eu.kanade.tachiyomi.util.system.logcat
+import kotlinx.coroutines.NonCancellable
+import kotlinx.coroutines.withContext
+import logcat.LogPriority
+
+class ReorderCategory(
+    private val categoryRepository: CategoryRepository,
+) {
+
+    suspend fun await(categoryId: Long, newPosition: Int) = withContext(NonCancellable) await@{
+        val categories = categoryRepository.getAll()
+
+        val currentIndex = categories.indexOfFirst { it.id == categoryId }
+        if (currentIndex == newPosition) {
+            return@await Result.Unchanged
+        }
+
+        val reorderedCategories = categories.toMutableList()
+        val reorderedCategory = reorderedCategories.removeAt(currentIndex)
+        reorderedCategories.add(newPosition, reorderedCategory)
+
+        val updates = reorderedCategories.mapIndexed { index, category ->
+            CategoryUpdate(
+                id = category.id,
+                order = index.toLong(),
+            )
+        }
+
+        try {
+            categoryRepository.updatePartial(updates)
+            Result.Success
+        } catch (e: Exception) {
+            logcat(LogPriority.ERROR, e)
+            Result.InternalError(e)
+        }
+    }
+
+    suspend fun await(category: Category, newPosition: Long): Result =
+        await(category.id, newPosition.toInt())
+
+    sealed class Result {
+        object Success : Result()
+        object Unchanged : Result()
+        data class InternalError(val error: Throwable) : Result()
+    }
+}

app/src/main/java/eu/kanade/domain/category/interactor/UpdateCategory.kt

@@ -2,14 +2,16 @@ package eu.kanade.domain.category.interactor
 
 import eu.kanade.domain.category.model.CategoryUpdate
 import eu.kanade.domain.category.repository.CategoryRepository
+import kotlinx.coroutines.NonCancellable
+import kotlinx.coroutines.withContext
 
 class UpdateCategory(
     private val categoryRepository: CategoryRepository,
 ) {
 
-    suspend fun await(payload: CategoryUpdate): Result {
-        return try {
-            categoryRepository.update(payload)
+    suspend fun await(payload: CategoryUpdate): Result = withContext(NonCancellable) {
+        try {
+            categoryRepository.updatePartial(payload)
             Result.Success
         } catch (e: Exception) {
             Result.Error(e)

app/src/main/java/eu/kanade/domain/category/model/Category.kt

@@ -37,6 +37,10 @@ data class Category(
     }
 }
 
+internal fun List<Category>.anyWithName(name: String): Boolean {
+    return any { name.equals(it.name, ignoreCase = true) }
+}
+
 fun Category.toDbCategory(): DbCategory = CategoryImpl().also {
     it.name = name
     it.id = id.toInt()

app/src/main/java/eu/kanade/domain/category/repository/CategoryRepository.kt

@@ -14,15 +14,11 @@ interface CategoryRepository {
 
     fun getCategoriesByMangaIdAsFlow(mangaId: Long): Flow<List<Category>>
 
-    @Throws(DuplicateNameException::class)
-    suspend fun insert(name: String, order: Long)
+    suspend fun insert(category: Category)
 
-    @Throws(DuplicateNameException::class)
-    suspend fun update(payload: CategoryUpdate)
+    suspend fun updatePartial(update: CategoryUpdate)
 
-    suspend fun delete(categoryId: Long)
+    suspend fun updatePartial(updates: List<CategoryUpdate>)
 
-    suspend fun checkDuplicateName(name: String): Boolean
+    suspend fun delete(categoryId: Long)
 }
-
-class DuplicateNameException(name: String) : Exception("There's a category which is named \"$name\" already")

app/src/main/java/eu/kanade/presentation/category/CategoryScreen.kt

@@ -0,0 +1,109 @@
+package eu.kanade.presentation.category
+
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.statusBarsPadding
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.material3.rememberTopAppBarScrollState
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.platform.LocalContext
+import eu.kanade.presentation.category.components.CategoryContent
+import eu.kanade.presentation.category.components.CategoryCreateDialog
+import eu.kanade.presentation.category.components.CategoryDeleteDialog
+import eu.kanade.presentation.category.components.CategoryFloatingActionButton
+import eu.kanade.presentation.category.components.CategoryRenameDialog
+import eu.kanade.presentation.category.components.CategoryTopAppBar
+import eu.kanade.presentation.components.EmptyScreen
+import eu.kanade.presentation.components.Scaffold
+import eu.kanade.presentation.util.horizontalPadding
+import eu.kanade.presentation.util.plus
+import eu.kanade.presentation.util.topPaddingValues
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.ui.category.CategoryPresenter
+import eu.kanade.tachiyomi.ui.category.CategoryPresenter.Dialog
+import eu.kanade.tachiyomi.util.system.toast
+import kotlinx.coroutines.flow.collectLatest
+
+@Composable
+fun CategoryScreen(
+    presenter: CategoryPresenter,
+    navigateUp: () -> Unit,
+) {
+    val lazyListState = rememberLazyListState()
+    val topAppBarScrollState = rememberTopAppBarScrollState()
+    val topAppBarScrollBehavior = TopAppBarDefaults.enterAlwaysScrollBehavior(topAppBarScrollState)
+    Scaffold(
+        modifier = Modifier
+            .statusBarsPadding()
+            .nestedScroll(topAppBarScrollBehavior.nestedScrollConnection),
+        topBar = {
+            CategoryTopAppBar(
+                topAppBarScrollBehavior = topAppBarScrollBehavior,
+                navigateUp = navigateUp,
+            )
+        },
+        floatingActionButton = {
+            CategoryFloatingActionButton(
+                lazyListState = lazyListState,
+                onCreate = { presenter.dialog = CategoryPresenter.Dialog.Create },
+            )
+        },
+    ) { paddingValues ->
+        val context = LocalContext.current
+        val categories by presenter.categories.collectAsState(initial = emptyList())
+        if (categories.isEmpty()) {
+            EmptyScreen(textResource = R.string.information_empty_category)
+        } else {
+            CategoryContent(
+                categories = categories,
+                lazyListState = lazyListState,
+                paddingValues = paddingValues + topPaddingValues + PaddingValues(horizontal = horizontalPadding),
+                onMoveUp = { presenter.moveUp(it) },
+                onMoveDown = { presenter.moveDown(it) },
+                onRename = { presenter.dialog = Dialog.Rename(it) },
+                onDelete = { presenter.dialog = Dialog.Delete(it) },
+            )
+        }
+        val onDismissRequest = { presenter.dialog = null }
+        when (val dialog = presenter.dialog) {
+            Dialog.Create -> {
+                CategoryCreateDialog(
+                    onDismissRequest = onDismissRequest,
+                    onCreate = { presenter.createCategory(it) },
+                )
+            }
+            is Dialog.Rename -> {
+                CategoryRenameDialog(
+                    onDismissRequest = onDismissRequest,
+                    onRename = { presenter.renameCategory(dialog.category, it) },
+                    category = dialog.category,
+                )
+            }
+            is Dialog.Delete -> {
+                CategoryDeleteDialog(
+                    onDismissRequest = onDismissRequest,
+                    onDelete = { presenter.deleteCategory(dialog.category) },
+                    category = dialog.category,
+                )
+            }
+            else -> {}
+        }
+        LaunchedEffect(Unit) {
+            presenter.events.collectLatest { event ->
+                when (event) {
+                    is CategoryPresenter.Event.CategoryWithNameAlreadyExists -> {
+                        context.toast(R.string.error_category_exists)
+                    }
+                    is CategoryPresenter.Event.InternalError -> {
+                        context.toast(R.string.internal_error)
+                    }
+                }
+            }
+        }
+    }
+}

app/src/main/java/eu/kanade/presentation/category/components/CategoryContent.kt

@@ -0,0 +1,39 @@
+package eu.kanade.presentation.category.components
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyListState
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.unit.dp
+import eu.kanade.domain.category.model.Category
+
+@Composable
+fun CategoryContent(
+    categories: List<Category>,
+    lazyListState: LazyListState,
+    paddingValues: PaddingValues,
+    onMoveUp: (Category) -> Unit,
+    onMoveDown: (Category) -> Unit,
+    onRename: (Category) -> Unit,
+    onDelete: (Category) -> Unit,
+) {
+    LazyColumn(
+        state = lazyListState,
+        contentPadding = paddingValues,
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+    ) {
+        itemsIndexed(categories) { index, category ->
+            CategoryListItem(
+                category = category,
+                canMoveUp = index != 0,
+                canMoveDown = index != categories.lastIndex,
+                onMoveUp = onMoveUp,
+                onMoveDown = onMoveDown,
+                onRename = onRename,
+                onDelete = onDelete,
+            )
+        }
+    }
+}

app/src/main/java/eu/kanade/presentation/category/components/CategoryDialogs.kt

@@ -0,0 +1,115 @@
+package eu.kanade.presentation.category.components
+
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.ui.res.stringResource
+import eu.kanade.domain.category.model.Category
+import eu.kanade.presentation.components.TextButton
+import eu.kanade.tachiyomi.R
+
+@Composable
+fun CategoryCreateDialog(
+    onDismissRequest: () -> Unit,
+    onCreate: (String) -> Unit,
+) {
+    val (name, onNameChange) = remember { mutableStateOf("") }
+    AlertDialog(
+        onDismissRequest = onDismissRequest,
+        confirmButton = {
+            TextButton(onClick = {
+                onCreate(name)
+                onDismissRequest()
+            },) {
+                Text(text = stringResource(id = R.string.action_add))
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismissRequest) {
+                Text(text = stringResource(id = R.string.action_cancel))
+            }
+        },
+        title = {
+            Text(text = stringResource(id = R.string.action_add_category))
+        },
+        text = {
+            OutlinedTextField(
+                value = name,
+                onValueChange = onNameChange,
+                label = {
+                    Text(text = stringResource(id = R.string.name))
+                },
+            )
+        },
+    )
+}
+
+@Composable
+fun CategoryRenameDialog(
+    onDismissRequest: () -> Unit,
+    onRename: (String) -> Unit,
+    category: Category,
+) {
+    val (name, onNameChange) = remember { mutableStateOf(category.name) }
+    AlertDialog(
+        onDismissRequest = onDismissRequest,
+        confirmButton = {
+            TextButton(onClick = {
+                onRename(name)
+                onDismissRequest()
+            },) {
+                Text(text = stringResource(id = android.R.string.ok))
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismissRequest) {
+                Text(text = stringResource(id = R.string.action_cancel))
+            }
+        },
+        title = {
+            Text(text = stringResource(id = R.string.action_rename_category))
+        },
+        text = {
+            OutlinedTextField(
+                value = name,
+                onValueChange = onNameChange,
+                label = {
+                    Text(text = stringResource(id = R.string.name))
+                },
+            )
+        },
+    )
+}
+
+@Composable
+fun CategoryDeleteDialog(
+    onDismissRequest: () -> Unit,
+    onDelete: () -> Unit,
+    category: Category,
+) {
+    AlertDialog(
+        onDismissRequest = onDismissRequest,
+        confirmButton = {
+            TextButton(onClick = onDismissRequest) {
+                Text(text = stringResource(R.string.no))
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = {
+                onDelete()
+                onDismissRequest()
+            },) {
+                Text(text = stringResource(R.string.yes))
+            }
+        },
+        title = {
+            Text(text = stringResource(R.string.delete_category))
+        },
+        text = {
+            Text(text = stringResource(R.string.delete_category_confirmation, category.name))
+        },
+    )
+}

app/src/main/java/eu/kanade/presentation/category/components/CategoryFloatingActionButton.kt

@@ -0,0 +1,30 @@
+package eu.kanade.presentation.category.components
+
+import androidx.compose.foundation.layout.navigationBarsPadding
+import androidx.compose.foundation.lazy.LazyListState
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.outlined.Add
+import androidx.compose.material3.Icon
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import eu.kanade.presentation.components.ExtendedFloatingActionButton
+import eu.kanade.presentation.util.isScrolledToEnd
+import eu.kanade.presentation.util.isScrollingUp
+import eu.kanade.tachiyomi.R
+
+@Composable
+fun CategoryFloatingActionButton(
+    lazyListState: LazyListState,
+    onCreate: () -> Unit,
+) {
+    ExtendedFloatingActionButton(
+        text = { Text(text = stringResource(id = R.string.action_add)) },
+        icon = { Icon(imageVector = Icons.Outlined.Add, contentDescription = "") },
+        onClick = onCreate,
+        modifier = Modifier
+            .navigationBarsPadding(),
+        expanded = lazyListState.isScrollingUp() || lazyListState.isScrolledToEnd(),
+    )
+}

app/src/main/java/eu/kanade/presentation/category/components/CategoryListItem.kt

@@ -0,0 +1,63 @@
+package eu.kanade.presentation.category.components
+
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.outlined.ArrowDropDown
+import androidx.compose.material.icons.outlined.ArrowDropUp
+import androidx.compose.material.icons.outlined.Delete
+import androidx.compose.material.icons.outlined.Edit
+import androidx.compose.material.icons.outlined.Label
+import androidx.compose.material3.ElevatedCard
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import eu.kanade.domain.category.model.Category
+import eu.kanade.presentation.util.horizontalPadding
+
+@Composable
+fun CategoryListItem(
+    category: Category,
+    canMoveUp: Boolean,
+    canMoveDown: Boolean,
+    onMoveUp: (Category) -> Unit,
+    onMoveDown: (Category) -> Unit,
+    onRename: (Category) -> Unit,
+    onDelete: (Category) -> Unit,
+) {
+    ElevatedCard {
+        Row(
+            modifier = Modifier
+                .padding(start = horizontalPadding, top = horizontalPadding, end = horizontalPadding),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Icon(imageVector = Icons.Outlined.Label, contentDescription = "")
+            Text(text = category.name, modifier = Modifier.padding(start = horizontalPadding))
+        }
+        Row {
+            IconButton(
+                onClick = { onMoveUp(category) },
+                enabled = canMoveUp,
+            ) {
+                Icon(imageVector = Icons.Outlined.ArrowDropUp, contentDescription = "")
+            }
+            IconButton(
+                onClick = { onMoveDown(category) },
+                enabled = canMoveDown,
+            ) {
+                Icon(imageVector = Icons.Outlined.ArrowDropDown, contentDescription = "")
+            }
+            Spacer(modifier = Modifier.weight(1f))
+            IconButton(onClick = { onRename(category) }) {
+                Icon(imageVector = Icons.Outlined.Edit, contentDescription = "")
+            }
+            IconButton(onClick = { onDelete(category) }) {
+                Icon(imageVector = Icons.Outlined.Delete, contentDescription = "")
+            }
+        }
+    }
+}

app/src/main/java/eu/kanade/presentation/category/components/CategoryTopAppBar.kt

@@ -0,0 +1,33 @@
+package eu.kanade.presentation.category.components
+
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.SmallTopAppBar
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBarScrollBehavior
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.res.stringResource
+import eu.kanade.tachiyomi.R
+
+@Composable
+fun CategoryTopAppBar(
+    topAppBarScrollBehavior: TopAppBarScrollBehavior,
+    navigateUp: () -> Unit,
+) {
+    SmallTopAppBar(
+        navigationIcon = {
+            IconButton(onClick = navigateUp) {
+                Icon(
+                    imageVector = Icons.Default.ArrowBack,
+                    contentDescription = stringResource(R.string.abc_action_bar_up_description),
+                )
+            }
+        },
+        title = {
+            Text(text = stringResource(id = R.string.action_edit_categories))
+        },
+        scrollBehavior = topAppBarScrollBehavior,
+    )
+}

app/src/main/java/eu/kanade/presentation/util/Constants.kt

@@ -3,6 +3,12 @@ package eu.kanade.presentation.util
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.ui.unit.dp
 
-val horizontalPadding = 16.dp
+private val horizontal = 16.dp
 
-val topPaddingValues = PaddingValues(top = 8.dp)
+private val vertical = 8.dp
+
+val horizontalPadding = horizontal
+
+val verticalPadding = vertical
+
+val topPaddingValues = PaddingValues(top = vertical)

app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryAdapter.kt

@@ -1,42 +0,0 @@
-package eu.kanade.tachiyomi.ui.category
-
-import eu.davidea.flexibleadapter.FlexibleAdapter
-
-/**
- * Custom adapter for categories.
- *
- * @param controller The containing controller.
- */
-class CategoryAdapter(controller: CategoryController) :
-    FlexibleAdapter<CategoryItem>(null, controller, true) {
-
-    /**
-     * Listener called when an item of the list is released.
-     */
-    val onItemReleaseListener: OnItemReleaseListener = controller
-
-    /**
-     * Clears the active selections from the list and the model.
-     */
-    override fun clearSelection() {
-        super.clearSelection()
-        (0 until itemCount).forEach { getItem(it)?.isSelected = false }
-    }
-
-    /**
-     * Toggles the selection of the given position.
-     *
-     * @param position The position to toggle.
-     */
-    override fun toggleSelection(position: Int) {
-        super.toggleSelection(position)
-        getItem(position)?.isSelected = isSelected(position)
-    }
-
-    interface OnItemReleaseListener {
-        /**
-         * Called when an item of the list is released.
-         */
-        fun onItemReleased(position: Int)
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryController.kt

@@ -1,357 +1,18 @@
 package eu.kanade.tachiyomi.ui.category
 
-import android.view.LayoutInflater
-import android.view.Menu
-import android.view.MenuItem
-import android.view.View
-import androidx.appcompat.app.AppCompatActivity
-import androidx.appcompat.view.ActionMode
-import androidx.recyclerview.widget.LinearLayoutManager
-import androidx.recyclerview.widget.RecyclerView
-import com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
-import com.google.android.material.snackbar.Snackbar
-import dev.chrisbanes.insetter.applyInsetter
-import eu.davidea.flexibleadapter.FlexibleAdapter
-import eu.davidea.flexibleadapter.SelectableAdapter
-import eu.davidea.flexibleadapter.helpers.UndoHelper
-import eu.kanade.domain.category.model.Category
-import eu.kanade.tachiyomi.R
-import eu.kanade.tachiyomi.databinding.CategoriesControllerBinding
-import eu.kanade.tachiyomi.ui.base.controller.FabController
-import eu.kanade.tachiyomi.ui.base.controller.NucleusController
-import eu.kanade.tachiyomi.ui.main.MainActivity
-import eu.kanade.tachiyomi.util.system.toast
-import eu.kanade.tachiyomi.util.view.shrinkOnScroll
-import kotlinx.coroutines.launch
+import androidx.compose.runtime.Composable
+import eu.kanade.presentation.category.CategoryScreen
+import eu.kanade.tachiyomi.ui.base.controller.FullComposeController
 
-/**
- * Controller to manage the categories for the users' library.
- */
-class CategoryController :
-    NucleusController<CategoriesControllerBinding, CategoryPresenter>(),
-    FabController,
-    ActionMode.Callback,
-    FlexibleAdapter.OnItemClickListener,
-    FlexibleAdapter.OnItemLongClickListener,
-    CategoryAdapter.OnItemReleaseListener,
-    CategoryCreateDialog.Listener,
-    CategoryRenameDialog.Listener,
-    UndoHelper.OnActionListener {
+class CategoryController : FullComposeController<CategoryPresenter>() {
 
-    /**
-     * Object used to show ActionMode toolbar.
-     */
-    private var actionMode: ActionMode? = null
-
-    /**
-     * Adapter containing category items.
-     */
-    private var adapter: CategoryAdapter? = null
-
-    private var actionFab: ExtendedFloatingActionButton? = null
-    private var actionFabScrollListener: RecyclerView.OnScrollListener? = null
-
-    /**
-     * Undo helper used for restoring a deleted category.
-     */
-    private var undoHelper: UndoHelper? = null
-
-    /**
-     * Creates the presenter for this controller. Not to be manually called.
-     */
     override fun createPresenter() = CategoryPresenter()
 
-    /**
-     * Returns the toolbar title to show when this controller is attached.
-     */
-    override fun getTitle(): String? {
-        return resources?.getString(R.string.action_edit_categories)
-    }
-
-    override fun createBinding(inflater: LayoutInflater) = CategoriesControllerBinding.inflate(inflater)
-
-    /**
-     * Called after view inflation. Used to initialize the view.
-     *
-     * @param view The view of this controller.
-     */
-    override fun onViewCreated(view: View) {
-        super.onViewCreated(view)
-
-        binding.recycler.applyInsetter {
-            type(navigationBars = true) {
-                padding()
-            }
-        }
-
-        adapter = CategoryAdapter(this@CategoryController)
-        binding.recycler.layoutManager = LinearLayoutManager(view.context)
-        binding.recycler.setHasFixedSize(true)
-        binding.recycler.adapter = adapter
-        adapter?.isHandleDragEnabled = true
-        adapter?.isPermanentDelete = false
-
-        actionFabScrollListener = actionFab?.shrinkOnScroll(binding.recycler)
-
-        viewScope.launch {
-            presenter.categories.collect {
-                setCategories(it.map(::CategoryItem))
-            }
-        }
-    }
-
-    override fun configureFab(fab: ExtendedFloatingActionButton) {
-        actionFab = fab
-        fab.setText(R.string.action_add)
-        fab.setIconResource(R.drawable.ic_add_24dp)
-        fab.setOnClickListener {
-            CategoryCreateDialog(this@CategoryController).showDialog(router, null)
-        }
-    }
-
-    override fun cleanupFab(fab: ExtendedFloatingActionButton) {
-        fab.setOnClickListener(null)
-        actionFabScrollListener?.let { binding.recycler.removeOnScrollListener(it) }
-        actionFab = null
-    }
-
-    /**
-     * Called when the view is being destroyed. Used to release references and remove callbacks.
-     *
-     * @param view The view of this controller.
-     */
-    override fun onDestroyView(view: View) {
-        // Manually call callback to delete categories if required
-        undoHelper?.onDeleteConfirmed(Snackbar.Callback.DISMISS_EVENT_MANUAL)
-        undoHelper = null
-        actionMode = null
-        adapter = null
-        super.onDestroyView(view)
-    }
-
-    /**
-     * Called from the presenter when the categories are updated.
-     *
-     * @param categories The new list of categories to display.
-     */
-    fun setCategories(categories: List<CategoryItem>) {
-        actionMode?.finish()
-        adapter?.updateDataSet(categories)
-        if (categories.isNotEmpty()) {
-            binding.emptyView.hide()
-            val selected = categories.filter { it.isSelected }
-            if (selected.isNotEmpty()) {
-                selected.forEach { onItemLongClick(categories.indexOf(it)) }
-            }
-        } else {
-            binding.emptyView.show(R.string.information_empty_category)
-        }
-    }
-
-    /**
-     * Called when action mode is first created. The menu supplied will be used to generate action
-     * buttons for the action mode.
-     *
-     * @param mode ActionMode being created.
-     * @param menu Menu used to populate action buttons.
-     * @return true if the action mode should be created, false if entering this mode should be
-     *              aborted.
-     */
-    override fun onCreateActionMode(mode: ActionMode, menu: Menu): Boolean {
-        // Inflate menu.
-        mode.menuInflater.inflate(R.menu.category_selection, menu)
-        // Enable adapter multi selection.
-        adapter?.mode = SelectableAdapter.Mode.MULTI
-        return true
-    }
-
-    /**
-     * Called to refresh an action mode's action menu whenever it is invalidated.
-     *
-     * @param mode ActionMode being prepared.
-     * @param menu Menu used to populate action buttons.
-     * @return true if the menu or action mode was updated, false otherwise.
-     */
-    override fun onPrepareActionMode(mode: ActionMode, menu: Menu): Boolean {
-        val adapter = adapter ?: return false
-        val count = adapter.selectedItemCount
-        mode.title = count.toString()
-
-        // Show edit button only when one item is selected
-        val editItem = mode.menu.findItem(R.id.action_edit)
-        editItem.isVisible = count == 1
-        return true
-    }
-
-    /**
-     * Called to report a user click on an action button.
-     *
-     * @param mode The current ActionMode.
-     * @param item The item that was clicked.
-     * @return true if this callback handled the event, false if the standard MenuItem invocation
-     *              should continue.
-     */
-    override fun onActionItemClicked(mode: ActionMode, item: MenuItem): Boolean {
-        val adapter = adapter ?: return false
-
-        when (item.itemId) {
-            R.id.action_delete -> {
-                undoHelper = UndoHelper(adapter, this)
-                undoHelper?.start(
-                    adapter.selectedPositions,
-                    (activity as? MainActivity)?.binding?.rootCoordinator!!,
-                    R.string.snack_categories_deleted,
-                    R.string.action_undo,
-                    4000,
-                )
-
-                mode.finish()
-            }
-            R.id.action_edit -> {
-                // Edit selected category
-                if (adapter.selectedItemCount == 1) {
-                    val position = adapter.selectedPositions.first()
-                    val category = adapter.getItem(position)?.category
-                    if (category != null) {
-                        editCategory(category)
-                    }
-                }
-            }
-            else -> return false
-        }
-        return true
-    }
-
-    /**
-     * Called when an action mode is about to be exited and destroyed.
-     *
-     * @param mode The current ActionMode being destroyed.
-     */
-    override fun onDestroyActionMode(mode: ActionMode) {
-        // Reset adapter to single selection
-        adapter?.mode = SelectableAdapter.Mode.IDLE
-        adapter?.clearSelection()
-        actionMode = null
-    }
-
-    /**
-     * Called when an item in the list is clicked.
-     *
-     * @param position The position of the clicked item.
-     * @return true if this click should enable selection mode.
-     */
-    override fun onItemClick(view: View, position: Int): Boolean {
-        // Check if action mode is initialized and selected item exist.
-        return if (actionMode != null && position != RecyclerView.NO_POSITION) {
-            toggleSelection(position)
-            true
-        } else {
-            false
-        }
-    }
-
-    /**
-     * Called when an item in the list is long clicked.
-     *
-     * @param position The position of the clicked item.
-     */
-    override fun onItemLongClick(position: Int) {
-        val activity = activity as? AppCompatActivity ?: return
-
-        // Check if action mode is initialized.
-        if (actionMode == null) {
-            // Initialize action mode
-            actionMode = activity.startSupportActionMode(this)
-        }
-
-        // Set item as selected
-        toggleSelection(position)
-    }
-
-    /**
-     * Toggle the selection state of an item.
-     * If the item was the last one in the selection and is unselected, the ActionMode is finished.
-     *
-     * @param position The position of the item to toggle.
-     */
-    private fun toggleSelection(position: Int) {
-        val adapter = adapter ?: return
-
-        // Mark the position selected
-        adapter.toggleSelection(position)
-
-        if (adapter.selectedItemCount == 0) {
-            actionMode?.finish()
-        } else {
-            actionMode?.invalidate()
-        }
-    }
-
-    /**
-     * Called when an item is released from a drag.
-     *
-     * @param position The position of the released item.
-     */
-    override fun onItemReleased(position: Int) {
-        val adapter = adapter ?: return
-        val categories = (0 until adapter.itemCount).mapNotNull { adapter.getItem(it)?.category }
-        presenter.reorderCategories(categories)
-    }
-
-    /**
-     * Called when the undo action is clicked in the snackbar.
-     *
-     * @param action The action performed.
-     */
-    override fun onActionCanceled(action: Int, positions: MutableList<Int>?) {
-        adapter?.restoreDeletedItems()
-        undoHelper = null
-    }
-
-    /**
-     * Called when the time to restore the items expires.
-     *
-     * @param action The action performed.
-     * @param event The event that triggered the action
-     */
-    override fun onActionConfirmed(action: Int, event: Int) {
-        val adapter = adapter ?: return
-        presenter.deleteCategories(adapter.deletedItems.map { it.category })
-        undoHelper = null
-    }
-
-    /**
-     * Show a dialog to let the user change the category name.
-     *
-     * @param category The category to be edited.
-     */
-    private fun editCategory(category: Category) {
-        CategoryRenameDialog(this, category).showDialog(router)
-    }
-
-    /**
-     * Renames the given category with the given name.
-     *
-     * @param category The category to rename.
-     * @param name The new name of the category.
-     */
-    override fun renameCategory(category: Category, name: String) {
-        presenter.renameCategory(category, name)
-    }
-
-    /**
-     * Creates a new category with the given name.
-     *
-     * @param name The name of the new category.
-     */
-    override fun createCategory(name: String) {
-        presenter.createCategory(name)
-    }
-
-    /**
-     * Called from the presenter when a category with the given name already exists.
-     */
-    fun onCategoryExistsError() {
-        activity?.toast(R.string.error_category_exists)
+    @Composable
+    override fun ComposeContent() {
+        CategoryScreen(
+            presenter = presenter,
+            navigateUp = router::popCurrentController,
+        )
     }
 }

app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryCreateDialog.kt

@@ -1,48 +0,0 @@
-package eu.kanade.tachiyomi.ui.category
-
-import android.app.Dialog
-import android.os.Bundle
-import com.bluelinelabs.conductor.Controller
-import com.google.android.material.dialog.MaterialAlertDialogBuilder
-import eu.kanade.tachiyomi.R
-import eu.kanade.tachiyomi.ui.base.controller.DialogController
-import eu.kanade.tachiyomi.widget.materialdialogs.setTextInput
-
-/**
- * Dialog to create a new category for the library.
- */
-class CategoryCreateDialog<T>(bundle: Bundle? = null) : DialogController(bundle)
-        where T : Controller, T : CategoryCreateDialog.Listener {
-
-    /**
-     * Name of the new category. Value updated with each input from the user.
-     */
-    private var currentName = ""
-
-    constructor(target: T) : this() {
-        targetController = target
-    }
-
-    /**
-     * Called when creating the dialog for this controller.
-     *
-     * @param savedViewState The saved state of this dialog.
-     * @return a new dialog instance.
-     */
-    override fun onCreateDialog(savedViewState: Bundle?): Dialog {
-        return MaterialAlertDialogBuilder(activity!!)
-            .setTitle(R.string.action_add_category)
-            .setTextInput(prefill = currentName) {
-                currentName = it
-            }
-            .setPositiveButton(android.R.string.ok) { _, _ ->
-                (targetController as? Listener)?.createCategory(currentName)
-            }
-            .setNegativeButton(android.R.string.cancel, null)
-            .create()
-    }
-
-    interface Listener {
-        fun createCategory(name: String)
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryHolder.kt

@@ -1,49 +0,0 @@
-package eu.kanade.tachiyomi.ui.category
-
-import android.view.View
-import androidx.recyclerview.widget.ItemTouchHelper
-import eu.davidea.viewholders.FlexibleViewHolder
-import eu.kanade.domain.category.model.Category
-import eu.kanade.tachiyomi.databinding.CategoriesItemBinding
-
-/**
- * Holder used to display category items.
- *
- * @param view The view used by category items.
- * @param adapter The adapter containing this holder.
- */
-class CategoryHolder(view: View, val adapter: CategoryAdapter) : FlexibleViewHolder(view, adapter) {
-
-    private val binding = CategoriesItemBinding.bind(view)
-
-    init {
-        setDragHandleView(binding.reorder)
-    }
-
-    /**
-     * Binds this holder with the given category.
-     *
-     * @param category The category to bind.
-     */
-    fun bind(category: Category) {
-        binding.title.text = category.name
-    }
-
-    /**
-     * Called when an item is released.
-     *
-     * @param position The position of the released item.
-     */
-    override fun onItemReleased(position: Int) {
-        super.onItemReleased(position)
-        adapter.onItemReleaseListener.onItemReleased(position)
-        binding.container.isDragged = false
-    }
-
-    override fun onActionStateChanged(position: Int, actionState: Int) {
-        super.onActionStateChanged(position, actionState)
-        if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) {
-            binding.container.isDragged = true
-        }
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryItem.kt

@@ -1,73 +0,0 @@
-package eu.kanade.tachiyomi.ui.category
-
-import android.view.View
-import androidx.recyclerview.widget.RecyclerView
-import eu.davidea.flexibleadapter.FlexibleAdapter
-import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
-import eu.davidea.flexibleadapter.items.IFlexible
-import eu.kanade.domain.category.model.Category
-import eu.kanade.tachiyomi.R
-
-/**
- * Category item for a recycler view.
- */
-class CategoryItem(val category: Category) : AbstractFlexibleItem<CategoryHolder>() {
-
-    /**
-     * Whether this item is currently selected.
-     */
-    var isSelected = false
-
-    /**
-     * Returns the layout resource for this item.
-     */
-    override fun getLayoutRes(): Int {
-        return R.layout.categories_item
-    }
-
-    /**
-     * Returns a new view holder for this item.
-     *
-     * @param view The view of this item.
-     * @param adapter The adapter of this item.
-     */
-    override fun createViewHolder(view: View, adapter: FlexibleAdapter<IFlexible<RecyclerView.ViewHolder>>): CategoryHolder {
-        return CategoryHolder(view, adapter as CategoryAdapter)
-    }
-
-    /**
-     * Binds the given view holder with this item.
-     *
-     * @param adapter The adapter of this item.
-     * @param holder The holder to bind.
-     * @param position The position of this item in the adapter.
-     * @param payloads List of partial changes.
-     */
-    override fun bindViewHolder(
-        adapter: FlexibleAdapter<IFlexible<RecyclerView.ViewHolder>>,
-        holder: CategoryHolder,
-        position: Int,
-        payloads: List<Any?>?,
-    ) {
-        holder.bind(category)
-    }
-
-    /**
-     * Returns true if this item is draggable.
-     */
-    override fun isDraggable(): Boolean {
-        return true
-    }
-
-    override fun equals(other: Any?): Boolean {
-        if (this === other) return true
-        if (other is CategoryItem) {
-            return category.id == other.category.id
-        }
-        return false
-    }
-
-    override fun hashCode(): Int {
-        return category.id.hashCode()
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryPresenter.kt

@@ -1,130 +1,91 @@
 package eu.kanade.tachiyomi.ui.category
 
-import android.os.Bundle
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import eu.kanade.domain.category.interactor.CreateCategoryWithName
 import eu.kanade.domain.category.interactor.DeleteCategory
 import eu.kanade.domain.category.interactor.GetCategories
-import eu.kanade.domain.category.interactor.InsertCategory
-import eu.kanade.domain.category.interactor.UpdateCategory
+import eu.kanade.domain.category.interactor.RenameCategory
+import eu.kanade.domain.category.interactor.ReorderCategory
 import eu.kanade.domain.category.model.Category
-import eu.kanade.domain.category.model.CategoryUpdate
-import eu.kanade.domain.category.repository.DuplicateNameException
 import eu.kanade.tachiyomi.ui.base.presenter.BasePresenter
 import eu.kanade.tachiyomi.util.lang.launchIO
-import eu.kanade.tachiyomi.util.lang.launchUI
-import eu.kanade.tachiyomi.util.system.logcat
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.flow.collectLatest
-import logcat.LogPriority
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.flow.consumeAsFlow
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
 
-/**
- * Presenter of [CategoryController]. Used to manage the categories of the library.
- */
 class CategoryPresenter(
     private val getCategories: GetCategories = Injekt.get(),
-    private val insertCategory: InsertCategory = Injekt.get(),
-    private val updateCategory: UpdateCategory = Injekt.get(),
+    private val createCategoryWithName: CreateCategoryWithName = Injekt.get(),
+    private val renameCategory: RenameCategory = Injekt.get(),
+    private val reorderCategory: ReorderCategory = Injekt.get(),
     private val deleteCategory: DeleteCategory = Injekt.get(),
 ) : BasePresenter<CategoryController>() {
 
-    private val _categories: MutableStateFlow<List<Category>> = MutableStateFlow(listOf())
-    val categories = _categories.asStateFlow()
+    var dialog: Dialog? by mutableStateOf(null)
 
-    /**
-     * Called when the presenter is created.
-     *
-     * @param savedState The saved state of this presenter.
-     */
-    override fun onCreate(savedState: Bundle?) {
-        super.onCreate(savedState)
+    val categories = getCategories.subscribe()
 
+    private val _events: Channel<Event> = Channel(Int.MAX_VALUE)
+    val events = _events.consumeAsFlow()
+
+    fun createCategory(name: String) {
         presenterScope.launchIO {
-            getCategories.subscribe()
-                .collectLatest { list ->
-                    _categories.value = list
-                }
+            when (createCategoryWithName.await(name)) {
+                is CreateCategoryWithName.Result.NameAlreadyExistsError -> _events.send(Event.CategoryWithNameAlreadyExists)
+                is CreateCategoryWithName.Result.InternalError -> _events.send(Event.InternalError)
+                else -> {}
+            }
         }
     }
 
-    /**
-     * Creates and adds a new category to the database.
-     *
-     * @param name The name of the category to create.
-     */
-    fun createCategory(name: String) {
+    fun deleteCategory(category: Category) {
         presenterScope.launchIO {
-            val result = insertCategory.await(
-                name = name,
-                order = categories.value.map { it.order + 1L }.maxOrNull() ?: 0L,
-            )
-            when (result) {
-                is InsertCategory.Result.Success -> {}
-                is InsertCategory.Result.Error -> {
-                    logcat(LogPriority.ERROR, result.error)
-                    if (result.error is DuplicateNameException) {
-                        launchUI { view?.onCategoryExistsError() }
-                    }
-                }
+            when (deleteCategory.await(category.id)) {
+                is DeleteCategory.Result.InternalError -> _events.send(Event.InternalError)
+                else -> {}
             }
         }
     }
 
-    /**
-     * Deletes the given categories from the database.
-     *
-     * @param categories The list of categories to delete.
-     */
-    fun deleteCategories(categories: List<Category>) {
+    fun moveUp(category: Category) {
         presenterScope.launchIO {
-            categories.forEach { category ->
-                deleteCategory.await(category.id)
+            when (reorderCategory.await(category, category.order - 1)) {
+                is ReorderCategory.Result.InternalError -> _events.send(Event.InternalError)
+                else -> {}
             }
         }
     }
 
-    /**
-     * Reorders the given categories in the database.
-     *
-     * @param categories The list of categories to reorder.
-     */
-    fun reorderCategories(categories: List<Category>) {
+    fun moveDown(category: Category) {
         presenterScope.launchIO {
-            categories.forEachIndexed { order, category ->
-                updateCategory.await(
-                    payload = CategoryUpdate(
-                        id = category.id,
-                        order = order.toLong(),
-                    ),
-                )
+            when (reorderCategory.await(category, category.order + 1)) {
+                is ReorderCategory.Result.InternalError -> _events.send(Event.InternalError)
+                else -> {}
             }
         }
     }
 
-    /**
-     * Renames a category.
-     *
-     * @param category The category to rename.
-     * @param name The new name of the category.
-     */
     fun renameCategory(category: Category, name: String) {
         presenterScope.launchIO {
-            val result = updateCategory.await(
-                payload = CategoryUpdate(
-                    id = category.id,
-                    name = name,
-                ),
-            )
-            when (result) {
-                is UpdateCategory.Result.Success -> {}
-                is UpdateCategory.Result.Error -> {
-                    logcat(LogPriority.ERROR, result.error)
-                    if (result.error is DuplicateNameException) {
-                        launchUI { view?.onCategoryExistsError() }
-                    }
-                }
+            when (renameCategory.await(category, name)) {
+                RenameCategory.Result.NameAlreadyExistsError -> _events.send(Event.CategoryWithNameAlreadyExists)
+                is RenameCategory.Result.InternalError -> _events.send(Event.InternalError)
+                else -> {}
             }
         }
     }
+
+    sealed class Dialog {
+        object Create : Dialog()
+        data class Rename(val category: Category) : Dialog()
+        data class Delete(val category: Category) : Dialog()
+    }
+
+    sealed class Event {
+        object CategoryWithNameAlreadyExists : Event()
+        object InternalError : Event()
+    }
 }

app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryRenameDialog.kt

@@ -1,83 +0,0 @@
-package eu.kanade.tachiyomi.ui.category
-
-import android.app.Dialog
-import android.os.Bundle
-import com.bluelinelabs.conductor.Controller
-import com.google.android.material.dialog.MaterialAlertDialogBuilder
-import eu.kanade.domain.category.model.Category
-import eu.kanade.tachiyomi.R
-import eu.kanade.tachiyomi.ui.base.controller.DialogController
-import eu.kanade.tachiyomi.widget.materialdialogs.setTextInput
-
-/**
- * Dialog to rename an existing category of the library.
- */
-class CategoryRenameDialog<T>(bundle: Bundle? = null) : DialogController(bundle)
-        where T : Controller, T : CategoryRenameDialog.Listener {
-
-    private var category: Category? = null
-
-    /**
-     * Name of the new category. Value updated with each input from the user.
-     */
-    private var currentName = ""
-
-    constructor(target: T, category: Category) : this() {
-        targetController = target
-        this.category = category
-        currentName = category.name
-    }
-
-    /**
-     * Called when creating the dialog for this controller.
-     *
-     * @param savedViewState The saved state of this dialog.
-     * @return a new dialog instance.
-     */
-    override fun onCreateDialog(savedViewState: Bundle?): Dialog {
-        return MaterialAlertDialogBuilder(activity!!)
-            .setTitle(R.string.action_rename_category)
-            .setTextInput(prefill = currentName) {
-                currentName = it
-            }
-            .setPositiveButton(android.R.string.ok) { _, _ -> onPositive() }
-            .setNegativeButton(android.R.string.cancel, null)
-            .create()
-    }
-
-    /**
-     * Called to save this Controller's state in the event that its host Activity is destroyed.
-     *
-     * @param outState The Bundle into which data should be saved
-     */
-    override fun onSaveInstanceState(outState: Bundle) {
-        outState.putSerializable(CATEGORY_KEY, category)
-        super.onSaveInstanceState(outState)
-    }
-
-    /**
-     * Restores data that was saved in the [onSaveInstanceState] method.
-     *
-     * @param savedInstanceState The bundle that has data to be restored
-     */
-    override fun onRestoreInstanceState(savedInstanceState: Bundle) {
-        super.onRestoreInstanceState(savedInstanceState)
-        category = savedInstanceState.getSerializable(CATEGORY_KEY) as? Category
-    }
-
-    /**
-     * Called when the positive button of the dialog is clicked.
-     */
-    private fun onPositive() {
-        val target = targetController as? Listener ?: return
-        val category = category ?: return
-
-        target.renameCategory(category, currentName)
-    }
-
-    interface Listener {
-        fun renameCategory(category: Category, name: String)
-    }
-}
-
-private const val CATEGORY_KEY = "CategoryRenameDialog.category"

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

@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent">
-
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/recycler"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:choiceMode="multipleChoice"
-        android:clipToPadding="false"
-        android:paddingBottom="@dimen/fab_list_padding"
-        tools:listitem="@layout/categories_item" />
-
-    <eu.kanade.tachiyomi.widget.EmptyView
-        android:id="@+id/empty_view"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="center"
-        android:visibility="gone" />
-
-</FrameLayout>

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

@@ -1,41 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<com.google.android.material.card.MaterialCardView xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/container"
-    android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    app:cardBackgroundColor="?android:attr/colorBackground"
-    app:cardElevation="0dp"
-    app:cardForegroundColor="@color/draggable_card_foreground">
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content">
-
-        <ImageView
-            android:id="@+id/reorder"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:padding="16dp"
-            android:scaleType="center"
-            app:srcCompat="@drawable/ic_drag_handle_24dp"
-            app:tint="?android:attr/textColorHint"
-            tools:ignore="ContentDescription" />
-
-        <TextView
-            android:id="@+id/title"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center_vertical"
-            android:layout_marginStart="16dp"
-            android:layout_marginEnd="16dp"
-            android:layout_weight="1"
-            android:ellipsize="end"
-            android:maxLines="1"
-            android:textAppearance="?attr/textAppearanceBodyMedium"
-            tools:text="Category Title" />
-
-    </LinearLayout>
-
-</com.google.android.material.card.MaterialCardView>

app/src/main/res/values/strings.xml

@@ -849,4 +849,9 @@
     <string name="pref_navigate_pan">Navigate to pan</string>
     <string name="pref_landscape_zoom">Zoom landscape image</string>
     <string name="cant_open_last_read_chapter">Unable to open last read chapter</string>
+    <string name="delete_category_confirmation">Do you wish to delete the category %s</string>
+    <string name="delete_category">Delete category</string>
+    <string name="yes">Yes</string>
+    <string name="no">No</string>
+    <string name="internal_error">InternalError: Check crash logs for further information</string>
 </resources>