Update to alpha08, use toRoute to obtain destination inside VM

Change-Id: I72f617c594b5e0ae272cf94d2d7288446153420a

app/src/main/kotlin/com/google/samples/apps/nowinandroid/ui/interests2pane/InterestsListDetailScreen.kt

@@ -36,6 +36,7 @@ import androidx.navigation.compose.rememberNavController
 import androidx.navigation.navArgument
 import com.google.samples.apps.nowinandroid.feature.interests.InterestsRoute
 import com.google.samples.apps.nowinandroid.feature.interests.navigation.INTERESTS_ROUTE
+import com.google.samples.apps.nowinandroid.feature.interests.navigation.InterestsDestination
 import com.google.samples.apps.nowinandroid.feature.interests.navigation.TOPIC_ID_ARG
 import com.google.samples.apps.nowinandroid.feature.topic.TopicDetailPlaceholder
 import com.google.samples.apps.nowinandroid.feature.topic.navigation.navigateToTopic
@@ -47,16 +48,7 @@ import kotlinx.serialization.Serializable
 @Serializable object DetailPaneNavHostDestination
 
 fun NavGraphBuilder.interestsListDetailScreen() {
-    composable(
-        route = INTERESTS_ROUTE,
-        arguments = listOf(
-            navArgument(TOPIC_ID_ARG) {
-                type = NavType.StringType
-                defaultValue = null
-                nullable = true
-            },
-        ),
-    ) {
+    composable<InterestsDestination>{
         InterestsListDetailScreen()
     }
 }

feature/interests/src/main/kotlin/com/google/samples/apps/nowinandroid/feature/interests/InterestsScreen.kt

@@ -46,10 +46,7 @@ fun InterestsRoute(
     InterestsScreen(
         uiState = uiState,
         followTopic = viewModel::followTopic,
-        onTopicClick = {
-            viewModel.onTopicClick(it)
-            onTopicClick(it)
-        },
+        onTopicClick = onTopicClick,
         highlightSelectedTopic = highlightSelectedTopic,
         modifier = modifier,
     )

feature/interests/src/main/kotlin/com/google/samples/apps/nowinandroid/feature/interests/InterestsViewModel.kt

@@ -19,47 +19,44 @@ package com.google.samples.apps.nowinandroid.feature.interests
 import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import androidx.navigation.toRoute
 import com.google.samples.apps.nowinandroid.core.data.repository.UserDataRepository
 import com.google.samples.apps.nowinandroid.core.domain.GetFollowableTopicsUseCase
 import com.google.samples.apps.nowinandroid.core.domain.TopicSortField
 import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
+import com.google.samples.apps.nowinandroid.feature.interests.navigation.InterestsDestination
 import com.google.samples.apps.nowinandroid.feature.interests.navigation.TOPIC_ID_ARG
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
 @HiltViewModel
 class InterestsViewModel @Inject constructor(
-    private val savedStateHandle: SavedStateHandle,
+    savedStateHandle: SavedStateHandle,
     val userDataRepository: UserDataRepository,
     getFollowableTopics: GetFollowableTopicsUseCase,
 ) : ViewModel() {
 
-    val selectedTopicId: StateFlow<String?> = savedStateHandle.getStateFlow(TOPIC_ID_ARG, null)
+    private val interestsDestination : InterestsDestination = savedStateHandle.toRoute()
 
-    val uiState: StateFlow<InterestsUiState> = combine(
-        selectedTopicId,
-        getFollowableTopics(sortBy = TopicSortField.NAME),
-        InterestsUiState::Interests,
-    ).stateIn(
-        scope = viewModelScope,
-        started = SharingStarted.WhileSubscribed(5_000),
-        initialValue = InterestsUiState.Loading,
-    )
+    val uiState: StateFlow<InterestsUiState> =
+        getFollowableTopics(sortBy = TopicSortField.NAME).map { topics ->
+            InterestsUiState.Interests(interestsDestination.topicId, topics)
+        }.stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000),
+            initialValue = InterestsUiState.Loading,
+        )
 
     fun followTopic(followedTopicId: String, followed: Boolean) {
         viewModelScope.launch {
             userDataRepository.setTopicIdFollowed(followedTopicId, followed)
         }
     }
-
-    fun onTopicClick(topicId: String?) {
-        savedStateHandle[TOPIC_ID_ARG] = topicId
-    }
 }
 
 sealed interface InterestsUiState {

feature/interests/src/main/kotlin/com/google/samples/apps/nowinandroid/feature/interests/navigation/InterestsNavigation.kt

@@ -23,12 +23,15 @@ import androidx.navigation.NavType
 import androidx.navigation.compose.composable
 import androidx.navigation.navArgument
 import com.google.samples.apps.nowinandroid.feature.interests.InterestsRoute
+import kotlinx.serialization.Serializable
 
 const val TOPIC_ID_ARG = "topicId"
 const val INTERESTS_ROUTE_BASE = "interests_route"
 const val INTERESTS_ROUTE = "$INTERESTS_ROUTE_BASE?$TOPIC_ID_ARG={$TOPIC_ID_ARG}"
 
-fun NavController.navigateToInterests(topicId: String? = null, navOptions: NavOptions? = null) {
+@Serializable data class InterestsDestination(val topicId: String?)
+
+fun NavController.navigateToInterestsOld(topicId: String? = null, navOptions: NavOptions? = null) {
     val route = if (topicId != null) {
         "${INTERESTS_ROUTE_BASE}?${TOPIC_ID_ARG}=$topicId"
     } else {
@@ -37,7 +40,12 @@ fun NavController.navigateToInterests(topicId: String? = null, navOptions: NavOp
     navigate(route, navOptions)
 }
 
-fun NavGraphBuilder.interestsScreen(
+fun NavController.navigateToInterests(topicId: String? = null, navOptions: NavOptions? = null) {
+    navigate(route = InterestsDestination(topicId), navOptions)
+}
+
+
+/*fun NavGraphBuilder.interestsScreenOld(
     onTopicClick: (String) -> Unit,
 ) {
     composable(
@@ -52,4 +60,6 @@ fun NavGraphBuilder.interestsScreen(
     ) {
         InterestsRoute(onTopicClick = onTopicClick)
     }
-}
+}*/
+
+

feature/topic/src/main/kotlin/com/google/samples/apps/nowinandroid/feature/topic/TopicViewModel.kt

@@ -19,6 +19,7 @@ package com.google.samples.apps.nowinandroid.feature.topic
 import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import androidx.navigation.toRoute
 import com.google.samples.apps.nowinandroid.core.data.repository.NewsResourceQuery
 import com.google.samples.apps.nowinandroid.core.data.repository.TopicsRepository
 import com.google.samples.apps.nowinandroid.core.data.repository.UserDataRepository
@@ -47,9 +48,7 @@ class TopicViewModel @Inject constructor(
     userNewsResourceRepository: UserNewsResourceRepository,
 ) : ViewModel() {
 
-    // TODO: Remove when alpha08 is released
-    private val topicDestination = TopicDestination(savedStateHandle["id"]!!)
-    //private val topicDestination : TopicDestination = savedStateHandle.toRoute()
+    private val topicDestination : TopicDestination = savedStateHandle.toRoute()
 
     val topicId = topicDestination.id
 

gradle/libs.versions.toml

@@ -21,7 +21,7 @@ androidxLifecycle = "2.7.0"
 androidxMacroBenchmark = "1.2.2"
 androidxMetrics = "1.0.0-alpha04"
 #androidxNavigation = "2.8.0-SNAPSHOT"
-androidxNavigation = "2.8.0-alpha07"
+androidxNavigation = "2.8.0-alpha08"
 androidxProfileinstaller = "1.3.1"
 androidxTestCore = "1.5.0"
 androidxTestExt = "1.1.5"