Use Voyager on Source Category screen

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

@@ -1,32 +1,28 @@
 package eu.kanade.presentation.category
 
 import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
-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.sources.SourceCategoryContent
 import eu.kanade.presentation.components.AppBar
 import eu.kanade.presentation.components.EmptyScreen
-import eu.kanade.presentation.components.LoadingScreen
 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.sources.SourceCategoryPresenter
-import eu.kanade.tachiyomi.ui.category.sources.SourceCategoryPresenter.Dialog
-import eu.kanade.tachiyomi.util.system.toast
-import kotlinx.coroutines.flow.collectLatest
+import eu.kanade.tachiyomi.ui.category.sources.SourceCategoryScreenState
 
 @Composable
 fun SourceCategoryScreen(
-    presenter: SourceCategoryPresenter,
+    state: SourceCategoryScreenState.Success,
+    onClickCreate: () -> Unit,
+    onClickRename: (String) -> Unit,
+    onClickDelete: (String) -> Unit,
     navigateUp: () -> Unit,
 ) {
     val lazyListState = rememberLazyListState()
@@ -41,63 +37,24 @@ fun SourceCategoryScreen(
         floatingActionButton = {
             CategoryFloatingActionButton(
                 lazyListState = lazyListState,
-                onCreate = { presenter.dialog = Dialog.Create },
+                onCreate = onClickCreate,
             )
         },
     ) { paddingValues ->
-        val context = LocalContext.current
-        when {
-            presenter.isLoading -> LoadingScreen()
-            presenter.isEmpty -> EmptyScreen(textResource = R.string.information_empty_category)
-            else -> {
-                SourceCategoryContent(
-                    state = presenter,
-                    lazyListState = lazyListState,
-                    paddingValues = paddingValues + topPaddingValues + PaddingValues(horizontal = horizontalPadding),
-                )
-            }
+        if (state.isEmpty) {
+            EmptyScreen(
+                textResource = R.string.information_empty_category,
+                modifier = Modifier.padding(paddingValues),
+            )
+            return@Scaffold
         }
 
-        val onDismissRequest = { presenter.dialog = null }
-        when (val dialog = presenter.dialog) {
-            Dialog.Create -> {
-                CategoryCreateDialog(
-                    onDismissRequest = onDismissRequest,
-                    onCreate = { presenter.createCategory(it) },
-                    title = stringResource(R.string.action_add_category),
-                )
-            }
-            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) },
-                    title = stringResource(R.string.delete_category),
-                    text = stringResource(R.string.delete_category_confirmation, dialog.category),
-                )
-            }
-            else -> {}
-        }
-        LaunchedEffect(Unit) {
-            presenter.events.collectLatest { event ->
-                when (event) {
-                    is SourceCategoryPresenter.Event.CategoryExists -> {
-                        context.toast(R.string.error_category_exists)
-                    }
-                    is SourceCategoryPresenter.Event.InternalError -> {
-                        context.toast(R.string.internal_error)
-                    }
-                    SourceCategoryPresenter.Event.InvalidName -> {
-                        context.toast(R.string.invalid_category_name)
-                    }
-                }
-            }
-        }
+        SourceCategoryContent(
+            categories = state.categories,
+            lazyListState = lazyListState,
+            paddingValues = paddingValues + topPaddingValues + PaddingValues(horizontal = horizontalPadding),
+            onClickRename = onClickRename,
+            onClickDelete = onClickDelete,
+        )
     }
 }

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

@@ -1,27 +0,0 @@
-package eu.kanade.presentation.category
-
-import androidx.compose.runtime.Stable
-import androidx.compose.runtime.derivedStateOf
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.setValue
-import eu.kanade.tachiyomi.ui.category.sources.SourceCategoryPresenter
-
-@Stable
-interface SourceCategoryState {
-    val isLoading: Boolean
-    var dialog: SourceCategoryPresenter.Dialog?
-    val categories: List<String>
-    val isEmpty: Boolean
-}
-
-fun SourceCategoryState(): SourceCategoryState {
-    return SourceCategoryStateImpl()
-}
-
-class SourceCategoryStateImpl : SourceCategoryState {
-    override var isLoading: Boolean by mutableStateOf(true)
-    override var dialog: SourceCategoryPresenter.Dialog? by mutableStateOf(null)
-    override var categories: List<String> by mutableStateOf(emptyList())
-    override val isEmpty: Boolean by derivedStateOf { categories.isEmpty() }
-}

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

@@ -7,28 +7,27 @@ import androidx.compose.foundation.lazy.items
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
-import eu.kanade.presentation.category.SourceCategoryState
 import eu.kanade.presentation.components.LazyColumn
-import eu.kanade.tachiyomi.ui.category.sources.SourceCategoryPresenter
 
 @Composable
 fun SourceCategoryContent(
-    state: SourceCategoryState,
+    categories: List<String>,
     lazyListState: LazyListState,
     paddingValues: PaddingValues,
+    onClickRename: (String) -> Unit,
+    onClickDelete: (String) -> Unit,
 ) {
-    val categories = state.categories
     LazyColumn(
         state = lazyListState,
         contentPadding = paddingValues,
         verticalArrangement = Arrangement.spacedBy(8.dp),
     ) {
-        items(categories) { category ->
+        items(categories, key = { it }) { category ->
             SourceCategoryListItem(
                 modifier = Modifier.animateItemPlacement(),
                 category = category,
-                onRename = { state.dialog = SourceCategoryPresenter.Dialog.Rename(category) },
-                onDelete = { state.dialog = SourceCategoryPresenter.Dialog.Delete(category) },
+                onRename = { onClickRename(category) },
+                onDelete = { onClickDelete(category) },
             )
         }
     }

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

@@ -1,21 +1,20 @@
 package eu.kanade.tachiyomi.ui.category.sources
 
 import androidx.compose.runtime.Composable
-import eu.kanade.presentation.category.SourceCategoryScreen
-import eu.kanade.tachiyomi.ui.base.controller.FullComposeController
+import androidx.compose.runtime.CompositionLocalProvider
+import cafe.adriel.voyager.navigator.Navigator
+import eu.kanade.presentation.util.LocalRouter
+import eu.kanade.tachiyomi.ui.base.controller.BasicFullComposeController
 
 /**
  * Controller to manage the categories for the users' library.
  */
-class SourceCategoryController : FullComposeController<SourceCategoryPresenter>() {
-
-    override fun createPresenter() = SourceCategoryPresenter()
+class SourceCategoryController : BasicFullComposeController() {
 
     @Composable
     override fun ComposeContent() {
-        SourceCategoryScreen(
-            presenter = presenter,
-            navigateUp = router::popCurrentController,
-        )
+        CompositionLocalProvider(LocalRouter provides router) {
+            Navigator(screen = SourceCategoryScreen())
+        }
     }
 }

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

@@ -1,96 +0,0 @@
-package eu.kanade.tachiyomi.ui.category.sources
-
-import android.os.Bundle
-import eu.kanade.domain.source.interactor.CreateSourceCategory
-import eu.kanade.domain.source.interactor.DeleteSourceCategory
-import eu.kanade.domain.source.interactor.GetSourceCategories
-import eu.kanade.domain.source.interactor.RenameSourceCategory
-import eu.kanade.presentation.category.SourceCategoryState
-import eu.kanade.presentation.category.SourceCategoryStateImpl
-import eu.kanade.tachiyomi.ui.base.presenter.BasePresenter
-import eu.kanade.tachiyomi.util.lang.launchIO
-import kotlinx.coroutines.channels.Channel
-import kotlinx.coroutines.flow.collectLatest
-import kotlinx.coroutines.flow.consumeAsFlow
-import uy.kohesive.injekt.Injekt
-import uy.kohesive.injekt.api.get
-
-/**
- * Presenter of [SourceCategoryController]. Used to manage the categories of the library.
- */
-class SourceCategoryPresenter(
-    private val state: SourceCategoryStateImpl = SourceCategoryState() as SourceCategoryStateImpl,
-    private val getSourceCategories: GetSourceCategories = Injekt.get(),
-    private val createSourceCategory: CreateSourceCategory = Injekt.get(),
-    private val renameSourceCategory: RenameSourceCategory = Injekt.get(),
-    private val deleteSourceCategory: DeleteSourceCategory = Injekt.get(),
-) : BasePresenter<SourceCategoryController>(), SourceCategoryState by state {
-
-    private val _events: Channel<Event> = Channel(Int.MAX_VALUE)
-    val events = _events.consumeAsFlow()
-
-    override fun onCreate(savedState: Bundle?) {
-        super.onCreate(savedState)
-        presenterScope.launchIO {
-            getSourceCategories.subscribe()
-                .collectLatest {
-                    state.isLoading = false
-                    state.categories = it
-                }
-        }
-    }
-
-    /**
-     * Creates and adds a new category to the database.
-     *
-     * @param name The name of the category to create.
-     */
-    fun createCategory(name: String) {
-        presenterScope.launchIO {
-            when (createSourceCategory.await(name)) {
-                is CreateSourceCategory.Result.CategoryExists -> _events.send(Event.CategoryExists)
-                is CreateSourceCategory.Result.InvalidName -> _events.send(Event.InvalidName)
-                else -> {}
-            }
-        }
-    }
-
-    /**
-     * Deletes the given categories from the database.
-     *
-     * @param categories The list of categories to delete.
-     */
-    fun deleteCategory(categories: String) {
-        presenterScope.launchIO {
-            deleteSourceCategory.await(categories)
-        }
-    }
-
-    /**
-     * Renames a category.
-     *
-     * @param categoryOld The category to rename.
-     * @param categoryNew The new name of the category.
-     */
-    fun renameCategory(categoryOld: String, categoryNew: String) {
-        presenterScope.launchIO {
-            when (renameSourceCategory.await(categoryOld, categoryNew)) {
-                is CreateSourceCategory.Result.CategoryExists -> _events.send(Event.CategoryExists)
-                is CreateSourceCategory.Result.InvalidName -> _events.send(Event.InvalidName)
-                else -> {}
-            }
-        }
-    }
-
-    sealed class Event {
-        object CategoryExists : Event()
-        object InvalidName : Event()
-        object InternalError : Event()
-    }
-
-    sealed class Dialog {
-        object Create : Dialog()
-        data class Rename(val category: String) : Dialog()
-        data class Delete(val category: String) : Dialog()
-    }
-}

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

@@ -0,0 +1,87 @@
+package eu.kanade.tachiyomi.ui.category.sources
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import cafe.adriel.voyager.core.model.rememberScreenModel
+import cafe.adriel.voyager.core.screen.Screen
+import cafe.adriel.voyager.navigator.currentOrThrow
+import eu.kanade.presentation.category.SourceCategoryScreen
+import eu.kanade.presentation.category.components.CategoryCreateDialog
+import eu.kanade.presentation.category.components.CategoryDeleteDialog
+import eu.kanade.presentation.category.components.CategoryRenameDialog
+import eu.kanade.presentation.components.LoadingScreen
+import eu.kanade.presentation.util.LocalRouter
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.util.system.toast
+import kotlinx.coroutines.flow.collectLatest
+
+class SourceCategoryScreen : Screen {
+
+    @Composable
+    override fun Content() {
+        val context = LocalContext.current
+        val router = LocalRouter.currentOrThrow
+        val screenModel = rememberScreenModel { SourceCategoryScreenModel() }
+
+        val state by screenModel.state.collectAsState()
+
+        if (state is SourceCategoryScreenState.Loading) {
+            LoadingScreen()
+            return
+        }
+
+        val successState = state as SourceCategoryScreenState.Success
+
+        SourceCategoryScreen(
+            state = successState,
+            onClickCreate = { screenModel.showDialog(SourceCategoryDialog.Create) },
+            onClickRename = { screenModel.showDialog(SourceCategoryDialog.Rename(it)) },
+            onClickDelete = { screenModel.showDialog(SourceCategoryDialog.Delete(it)) },
+            navigateUp = router::popCurrentController,
+        )
+
+        when (val dialog = successState.dialog) {
+            null -> {}
+            SourceCategoryDialog.Create -> {
+                CategoryCreateDialog(
+                    onDismissRequest = screenModel::dismissDialog,
+                    onCreate = { screenModel.createCategory(it) },
+                    // SY -->
+                    title = stringResource(R.string.action_add_category),
+                    // SY <--
+                )
+            }
+            is SourceCategoryDialog.Rename -> {
+                CategoryRenameDialog(
+                    onDismissRequest = screenModel::dismissDialog,
+                    onRename = { screenModel.renameCategory(dialog.category, it) },
+                    // SY -->
+                    category = dialog.category,
+                    // SY <--
+                )
+            }
+            is SourceCategoryDialog.Delete -> {
+                CategoryDeleteDialog(
+                    onDismissRequest = screenModel::dismissDialog,
+                    onDelete = { screenModel.deleteCategory(dialog.category) },
+                    // SY -->
+                    title = stringResource(R.string.delete_category),
+                    text = stringResource(R.string.delete_category_confirmation, dialog.category),
+                    // SY <--
+                )
+            }
+        }
+
+        LaunchedEffect(Unit) {
+            screenModel.events.collectLatest { event ->
+                if (event is SourceCategoryEvent.LocalizedMessage) {
+                    context.toast(event.stringRes)
+                }
+            }
+        }
+    }
+}

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

@@ -0,0 +1,134 @@
+package eu.kanade.tachiyomi.ui.category.sources
+
+import androidx.annotation.StringRes
+import androidx.compose.runtime.Immutable
+import cafe.adriel.voyager.core.model.StateScreenModel
+import cafe.adriel.voyager.core.model.coroutineScope
+import eu.kanade.domain.source.interactor.CreateSourceCategory
+import eu.kanade.domain.source.interactor.DeleteSourceCategory
+import eu.kanade.domain.source.interactor.GetSourceCategories
+import eu.kanade.domain.source.interactor.RenameSourceCategory
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.util.lang.launchIO
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.consumeAsFlow
+import kotlinx.coroutines.flow.update
+import uy.kohesive.injekt.Injekt
+import uy.kohesive.injekt.api.get
+
+/**
+ * Presenter of [SourceCategoryController]. Used to manage the categories of the library.
+ */
+class SourceCategoryScreenModel(
+    private val getSourceCategories: GetSourceCategories = Injekt.get(),
+    private val createSourceCategory: CreateSourceCategory = Injekt.get(),
+    private val renameSourceCategory: RenameSourceCategory = Injekt.get(),
+    private val deleteSourceCategory: DeleteSourceCategory = Injekt.get(),
+) : StateScreenModel<SourceCategoryScreenState>(SourceCategoryScreenState.Loading) {
+
+    private val _events: Channel<SourceCategoryEvent> = Channel(Int.MAX_VALUE)
+    val events = _events.consumeAsFlow()
+
+    init {
+        coroutineScope.launchIO {
+            getSourceCategories.subscribe()
+                .collectLatest { categories ->
+                    mutableState.update {
+                        SourceCategoryScreenState.Success(
+                            categories = categories,
+                        )
+                    }
+                }
+        }
+    }
+
+    /**
+     * Creates and adds a new category to the database.
+     *
+     * @param name The name of the category to create.
+     */
+    fun createCategory(name: String) {
+        coroutineScope.launchIO {
+            when (createSourceCategory.await(name)) {
+                is CreateSourceCategory.Result.CategoryExists -> _events.send(SourceCategoryEvent.CategoryExists)
+                is CreateSourceCategory.Result.InvalidName -> _events.send(SourceCategoryEvent.InvalidName)
+                else -> {}
+            }
+        }
+    }
+
+    /**
+     * Deletes the given categories from the database.
+     *
+     * @param categories The list of categories to delete.
+     */
+    fun deleteCategory(categories: String) {
+        coroutineScope.launchIO {
+            deleteSourceCategory.await(categories)
+        }
+    }
+
+    /**
+     * Renames a category.
+     *
+     * @param categoryOld The category to rename.
+     * @param categoryNew The new name of the category.
+     */
+    fun renameCategory(categoryOld: String, categoryNew: String) {
+        coroutineScope.launchIO {
+            when (renameSourceCategory.await(categoryOld, categoryNew)) {
+                is CreateSourceCategory.Result.CategoryExists -> _events.send(SourceCategoryEvent.CategoryExists)
+                is CreateSourceCategory.Result.InvalidName -> _events.send(SourceCategoryEvent.InvalidName)
+                else -> {}
+            }
+        }
+    }
+
+    fun showDialog(dialog: SourceCategoryDialog) {
+        mutableState.update {
+            when (it) {
+                SourceCategoryScreenState.Loading -> it
+                is SourceCategoryScreenState.Success -> it.copy(dialog = dialog)
+            }
+        }
+    }
+
+    fun dismissDialog() {
+        mutableState.update {
+            when (it) {
+                SourceCategoryScreenState.Loading -> it
+                is SourceCategoryScreenState.Success -> it.copy(dialog = null)
+            }
+        }
+    }
+}
+
+sealed class SourceCategoryEvent {
+    sealed class LocalizedMessage(@StringRes val stringRes: Int) : SourceCategoryEvent()
+    object CategoryExists : LocalizedMessage(R.string.error_category_exists)
+    object InvalidName : LocalizedMessage(R.string.invalid_category_name)
+    object InternalError : LocalizedMessage(R.string.internal_error)
+}
+
+sealed class SourceCategoryDialog {
+    object Create : SourceCategoryDialog()
+    data class Rename(val category: String) : SourceCategoryDialog()
+    data class Delete(val category: String) : SourceCategoryDialog()
+}
+
+sealed class SourceCategoryScreenState {
+
+    @Immutable
+    object Loading : SourceCategoryScreenState()
+
+    @Immutable
+    data class Success(
+        val categories: List<String>,
+        val dialog: SourceCategoryDialog? = null,
+    ) : SourceCategoryScreenState() {
+
+        val isEmpty: Boolean
+            get() = categories.isEmpty()
+    }
+}