Use Voyager on Sort Tags screen

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

@@ -1,31 +1,29 @@
 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.genre.SortTagContent
 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.genre.SortTagPresenter
-import eu.kanade.tachiyomi.ui.category.genre.SortTagPresenter.Dialog
-import eu.kanade.tachiyomi.util.system.toast
-import kotlinx.coroutines.flow.collectLatest
+import eu.kanade.tachiyomi.ui.category.genre.SortTagScreenState
 
 @Composable
 fun SortTagScreen(
-    presenter: SortTagPresenter,
+    state: SortTagScreenState.Success,
+    onClickCreate: () -> Unit,
+    onClickDelete: (String) -> Unit,
+    onClickMoveUp: (String, Int) -> Unit,
+    onClickMoveDown: (String, Int) -> Unit,
     navigateUp: () -> Unit,
 ) {
     val lazyListState = rememberLazyListState()
@@ -40,56 +38,25 @@ fun SortTagScreen(
         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 -> {
-                SortTagContent(
-                    state = presenter,
-                    lazyListState = lazyListState,
-                    paddingValues = paddingValues + topPaddingValues + PaddingValues(horizontal = horizontalPadding),
-                    onMoveUp = { tag, index -> presenter.moveUp(tag, index) },
-                    onMoveDown = { tag, index -> presenter.moveDown(tag, index) },
-                )
-            }
+        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.createTag(it) },
-                    title = stringResource(R.string.add_tag),
-                    extraMessage = stringResource(R.string.action_add_tags_message),
-                )
-            }
-            is Dialog.Delete -> {
-                CategoryDeleteDialog(
-                    onDismissRequest = onDismissRequest,
-                    onDelete = { presenter.delete(dialog.tag) },
-                    title = stringResource(R.string.delete_tag),
-                    text = stringResource(R.string.delete_tag_confirmation, dialog.tag),
-                )
-            }
-            else -> {}
-        }
-        LaunchedEffect(Unit) {
-            presenter.events.collectLatest { event ->
-                when (event) {
-                    is SortTagPresenter.Event.TagExists -> {
-                        context.toast(R.string.error_tag_exists)
-                    }
-                    is SortTagPresenter.Event.InternalError -> {
-                        context.toast(R.string.internal_error)
-                    }
-                }
-            }
-        }
+        SortTagContent(
+            tags = state.tags,
+            lazyListState = lazyListState,
+            paddingValues = paddingValues + topPaddingValues + PaddingValues(horizontal = horizontalPadding),
+            onClickDelete = onClickDelete,
+            onMoveUp = onClickMoveUp,
+            onMoveDown = onClickMoveDown,
+        )
     }
 }

app/src/main/java/eu/kanade/presentation/category/SortTagState.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.genre.SortTagPresenter
-
-@Stable
-interface SortTagState {
-    val isLoading: Boolean
-    var dialog: SortTagPresenter.Dialog?
-    val tags: List<String>
-    val isEmpty: Boolean
-}
-
-fun SortTagState(): SortTagState {
-    return SortTagStateImpl()
-}
-
-class SortTagStateImpl : SortTagState {
-    override var isLoading: Boolean by mutableStateOf(true)
-    override var dialog: SortTagPresenter.Dialog? by mutableStateOf(null)
-    override var tags: List<String> by mutableStateOf(emptyList())
-    override val isEmpty: Boolean by derivedStateOf { tags.isEmpty() }
-}

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

@@ -7,25 +7,23 @@ import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
-import eu.kanade.presentation.category.SortTagState
 import eu.kanade.presentation.components.LazyColumn
-import eu.kanade.tachiyomi.ui.category.genre.SortTagPresenter
 
 @Composable
 fun SortTagContent(
-    state: SortTagState,
+    tags: List<String>,
     lazyListState: LazyListState,
     paddingValues: PaddingValues,
+    onClickDelete: (String) -> Unit,
     onMoveUp: (String, Int) -> Unit,
     onMoveDown: (String, Int) -> Unit,
 ) {
-    val tags = state.tags
     LazyColumn(
         state = lazyListState,
         contentPadding = paddingValues,
         verticalArrangement = Arrangement.spacedBy(8.dp),
     ) {
-        itemsIndexed(tags) { index, tag ->
+        itemsIndexed(tags, key = { _, tag -> tag }) { index, tag ->
             SortTagListItem(
                 modifier = Modifier.animateItemPlacement(),
                 tag = tag,
@@ -33,7 +31,7 @@ fun SortTagContent(
                 canMoveDown = index != tags.lastIndex,
                 onMoveUp = { onMoveUp(tag, index) },
                 onMoveDown = { onMoveDown(tag, index) },
-                onDelete = { state.dialog = SortTagPresenter.Dialog.Delete(tag) },
+                onDelete = { onClickDelete(tag) },
             )
         }
     }

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

@@ -1,21 +1,20 @@
 package eu.kanade.tachiyomi.ui.category.genre
 
 import androidx.compose.runtime.Composable
-import eu.kanade.presentation.category.SortTagScreen
-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 SortTagController : FullComposeController<SortTagPresenter>() {
-
-    override fun createPresenter() = SortTagPresenter()
+class SortTagController : BasicFullComposeController() {
 
     @Composable
     override fun ComposeContent() {
-        SortTagScreen(
-            presenter = presenter,
-            navigateUp = router::popCurrentController,
-        )
+        CompositionLocalProvider(LocalRouter provides router) {
+            Navigator(screen = SortTagScreen())
+        }
     }
 }

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

@@ -1,85 +0,0 @@
-package eu.kanade.tachiyomi.ui.category.genre
-
-import android.os.Bundle
-import eu.kanade.domain.manga.interactor.CreateSortTag
-import eu.kanade.domain.manga.interactor.DeleteSortTag
-import eu.kanade.domain.manga.interactor.GetSortTag
-import eu.kanade.domain.manga.interactor.ReorderSortTag
-import eu.kanade.presentation.category.SortTagState
-import eu.kanade.presentation.category.SortTagStateImpl
-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 [SortTagController]. Used to manage the categories of the library.
- */
-class SortTagPresenter(
-    private val state: SortTagStateImpl = SortTagState() as SortTagStateImpl,
-    private val getSortTag: GetSortTag = Injekt.get(),
-    private val createSortTag: CreateSortTag = Injekt.get(),
-    private val deleteSortTag: DeleteSortTag = Injekt.get(),
-    private val reorderSortTag: ReorderSortTag = Injekt.get(),
-) : BasePresenter<SortTagController>(), SortTagState 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 {
-            getSortTag.subscribe()
-                .collectLatest {
-                    state.isLoading = false
-                    state.tags = it
-                }
-        }
-    }
-
-    fun createTag(name: String) {
-        presenterScope.launchIO {
-            when (createSortTag.await(name)) {
-                is CreateSortTag.Result.TagExists -> _events.send(Event.TagExists)
-                else -> {}
-            }
-        }
-    }
-
-    fun delete(tag: String) {
-        presenterScope.launchIO {
-            deleteSortTag.await(tag)
-        }
-    }
-
-    fun moveUp(tag: String, index: Int) {
-        presenterScope.launchIO {
-            when (reorderSortTag.await(tag, index - 1)) {
-                is ReorderSortTag.Result.InternalError -> _events.send(Event.InternalError)
-                else -> {}
-            }
-        }
-    }
-
-    fun moveDown(tag: String, index: Int) {
-        presenterScope.launchIO {
-            when (reorderSortTag.await(tag, index + 1)) {
-                is ReorderSortTag.Result.InternalError -> _events.send(Event.InternalError)
-                else -> {}
-            }
-        }
-    }
-
-    sealed class Event {
-        object TagExists : Event()
-        object InternalError : Event()
-    }
-
-    sealed class Dialog {
-        object Create : Dialog()
-        data class Delete(val tag: String) : Dialog()
-    }
-}

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

@@ -0,0 +1,74 @@
+package eu.kanade.tachiyomi.ui.category.genre
+
+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.components.CategoryCreateDialog
+import eu.kanade.presentation.category.components.CategoryDeleteDialog
+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 SortTagScreen : Screen {
+
+    @Composable
+    override fun Content() {
+        val context = LocalContext.current
+        val router = LocalRouter.currentOrThrow
+        val screenModel = rememberScreenModel { SortTagScreenModel() }
+
+        val state by screenModel.state.collectAsState()
+
+        if (state is SortTagScreenState.Loading) {
+            LoadingScreen()
+            return
+        }
+
+        val successState = state as SortTagScreenState.Success
+
+        eu.kanade.presentation.category.SortTagScreen(
+            state = successState,
+            onClickCreate = { screenModel.showDialog(SortTagDialog.Create) },
+            onClickDelete = { screenModel.showDialog(SortTagDialog.Delete(it)) },
+            onClickMoveUp = screenModel::moveUp,
+            onClickMoveDown = screenModel::moveDown,
+            navigateUp = router::popCurrentController,
+        )
+
+        when (val dialog = successState.dialog) {
+            null -> {}
+            SortTagDialog.Create -> {
+                CategoryCreateDialog(
+                    onDismissRequest = screenModel::dismissDialog,
+                    onCreate = { screenModel.createTag(it) },
+                    title = stringResource(R.string.add_tag),
+                    extraMessage = stringResource(R.string.action_add_tags_message),
+                )
+            }
+            is SortTagDialog.Delete -> {
+                CategoryDeleteDialog(
+                    onDismissRequest = screenModel::dismissDialog,
+                    onDelete = { screenModel.delete(dialog.tag) },
+                    title = stringResource(R.string.delete_tag),
+                    text = stringResource(R.string.delete_tag_confirmation, dialog.tag),
+                )
+            }
+        }
+
+        LaunchedEffect(Unit) {
+            screenModel.events.collectLatest { event ->
+                if (event is SortTagEvent.LocalizedMessage) {
+                    context.toast(event.stringRes)
+                }
+            }
+        }
+    }
+}

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

@@ -0,0 +1,123 @@
+package eu.kanade.tachiyomi.ui.category.genre
+
+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.manga.interactor.CreateSortTag
+import eu.kanade.domain.manga.interactor.DeleteSortTag
+import eu.kanade.domain.manga.interactor.GetSortTag
+import eu.kanade.domain.manga.interactor.ReorderSortTag
+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 [SortTagController]. Used to manage the categories of the library.
+ */
+class SortTagScreenModel(
+    private val getSortTag: GetSortTag = Injekt.get(),
+    private val createSortTag: CreateSortTag = Injekt.get(),
+    private val deleteSortTag: DeleteSortTag = Injekt.get(),
+    private val reorderSortTag: ReorderSortTag = Injekt.get(),
+) : StateScreenModel<SortTagScreenState>(SortTagScreenState.Loading) {
+
+    private val _events: Channel<SortTagEvent> = Channel(Int.MAX_VALUE)
+    val events = _events.consumeAsFlow()
+
+    init {
+        coroutineScope.launchIO {
+            getSortTag.subscribe()
+                .collectLatest { tags ->
+                    mutableState.update {
+                        SortTagScreenState.Success(
+                            tags = tags,
+                        )
+                    }
+                }
+        }
+    }
+
+    fun createTag(name: String) {
+        coroutineScope.launchIO {
+            when (createSortTag.await(name)) {
+                is CreateSortTag.Result.TagExists -> _events.send(SortTagEvent.TagExists)
+                else -> {}
+            }
+        }
+    }
+
+    fun delete(tag: String) {
+        coroutineScope.launchIO {
+            deleteSortTag.await(tag)
+        }
+    }
+
+    fun moveUp(tag: String, index: Int) {
+        coroutineScope.launchIO {
+            when (reorderSortTag.await(tag, index - 1)) {
+                is ReorderSortTag.Result.InternalError -> _events.send(SortTagEvent.InternalError)
+                else -> {}
+            }
+        }
+    }
+
+    fun moveDown(tag: String, index: Int) {
+        coroutineScope.launchIO {
+            when (reorderSortTag.await(tag, index + 1)) {
+                is ReorderSortTag.Result.InternalError -> _events.send(SortTagEvent.InternalError)
+                else -> {}
+            }
+        }
+    }
+
+    fun showDialog(dialog: SortTagDialog) {
+        mutableState.update {
+            when (it) {
+                SortTagScreenState.Loading -> it
+                is SortTagScreenState.Success -> it.copy(dialog = dialog)
+            }
+        }
+    }
+
+    fun dismissDialog() {
+        mutableState.update {
+            when (it) {
+                SortTagScreenState.Loading -> it
+                is SortTagScreenState.Success -> it.copy(dialog = null)
+            }
+        }
+    }
+}
+
+sealed class SortTagEvent {
+    sealed class LocalizedMessage(@StringRes val stringRes: Int) : SortTagEvent()
+    object TagExists : LocalizedMessage(R.string.error_tag_exists)
+    object InternalError : LocalizedMessage(R.string.internal_error)
+}
+
+sealed class SortTagDialog {
+    object Create : SortTagDialog()
+    data class Delete(val tag: String) : SortTagDialog()
+}
+
+sealed class SortTagScreenState {
+
+    @Immutable
+    object Loading : SortTagScreenState()
+
+    @Immutable
+    data class Success(
+        val tags: List<String>,
+        val dialog: SortTagDialog? = null,
+    ) : SortTagScreenState() {
+
+        val isEmpty: Boolean
+            get() = tags.isEmpty()
+    }
+}