[ISSUE-72] - Mantendo paginas já carregadas após recomposição

feature-list-streams/src/main/java/com/codandotv/streamplayerapp/feature_list_streams/list/presentation/screens/ListStreamViewModel.kt

@@ -1,10 +1,9 @@
 package com.codandotv.streamplayerapp.feature_list_streams.list.presentation.screens
 
 import androidx.lifecycle.DefaultLifecycleObserver
-import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
-import androidx.paging.PagingData
+import androidx.paging.cachedIn
 import androidx.paging.map
 import com.codandotv.streamplayerapp.core_networking.handleError.catchFailure
 import com.codandotv.streamplayerapp.feature.list.streams.R
@@ -17,7 +16,7 @@ import com.codandotv.streamplayerapp.feature_list_streams.list.domain.model.High
 import com.codandotv.streamplayerapp.feature_list_streams.list.domain.model.IconAndTextInfo
 import com.codandotv.streamplayerapp.feature_list_streams.list.domain.model.Stream
 import com.codandotv.streamplayerapp.feature_list_streams.list.presentation.widgets.StreamsCardContent
-import kotlinx.coroutines.flow.Flow
+import com.codandotv.streamplayerapp.feature_list_streams.list.presentation.widgets.StreamsCarouselContent
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.combine
@@ -37,7 +36,7 @@ class ListStreamViewModel(
 
     private val _uiState = MutableStateFlow(
         ListStreamsUIState(
-            genres = emptyList(),
+            streamsCarouselContent = emptyList(),
             isLoading = false
         )
     )
@@ -47,9 +46,7 @@ class ListStreamViewModel(
         initialValue = _uiState.value
     )
 
-    override fun onCreate(owner: LifecycleOwner) {
-        super.onCreate(owner)
-
+    init {
         viewModelScope.launch {
             latestStream()
                 .combine(
@@ -64,29 +61,18 @@ class ListStreamViewModel(
                 .catchFailure {
                     println(">>>> ${it.errorMessage}")
                 }
-                .collect {
-                    val (latest, genres) = it
+                .collect { pair ->
+                    val (latest, genres) = pair
+
                     _uiState.update {
                         it.copy(
-                            genres = genres,
+                            streamsCarouselContent = genres.map { genreTarget ->
+                                getStreamsByGenre(genreTarget)
+                            },
                             highlightBanner = getHighlightBanner(latest)
                         )
                     }
                 }
-
-            if (uiState.value.genres.isEmpty()) {
-                listGenres()
-                    .onStart { onLoading() }
-                    .catchFailure {
-                        println(">>>> ${it.errorMessage}")
-                    }
-                    .onCompletion { loaded() }
-                    .collect { genres ->
-                        _uiState.update {
-                            it.copy(genres = genres)
-                        }
-                    }
-            }
         }
     }
 
@@ -114,16 +100,19 @@ class ListStreamViewModel(
             ),
         )
 
-    fun loadMovies(genre: Genre): Flow<PagingData<StreamsCardContent>> {
-        return listStreams(genre).map {
-            it.map { stream ->
-                StreamsCardContent(
-                    contentDescription = stream.name,
-                    url = stream.posterPathUrl,
-                    id = stream.id
-                )
-            }
-        }
+    private fun getStreamsByGenre(genre: Genre): StreamsCarouselContent {
+        return StreamsCarouselContent(
+            genre.name,
+            listStreams(genre).map {
+                it.map { stream ->
+                    StreamsCardContent(
+                        contentDescription = stream.name,
+                        url = stream.posterPathUrl,
+                        id = stream.id
+                    )
+                }
+            }.cachedIn(viewModelScope)
+        )
     }
 
     private fun loaded() {

feature-list-streams/src/main/java/com/codandotv/streamplayerapp/feature_list_streams/list/presentation/screens/ListStreamsScreen.kt

@@ -83,10 +83,9 @@ fun ListStreamsScreen(
 
                     HighlightBanner(data = uiState.highlightBanner)
 
-                    uiState.genres.forEach { genre ->
+                    uiState.streamsCarouselContent.forEach { streamCarouselContent ->
                         StreamsCarousel(
-                            title = genre.name,
-                            contentList = viewModel.loadMovies(genre),
+                            content = streamCarouselContent,
                             onNavigateDetailList = onNavigateDetailList,
                         )
                         Spacer(modifier = Modifier.height(12.dp))

feature-list-streams/src/main/java/com/codandotv/streamplayerapp/feature_list_streams/list/presentation/screens/ListStreamsUIState.kt

@@ -1,10 +1,10 @@
 package com.codandotv.streamplayerapp.feature_list_streams.list.presentation.screens
 
-import com.codandotv.streamplayerapp.feature_list_streams.list.domain.model.Genre
 import com.codandotv.streamplayerapp.feature_list_streams.list.domain.model.HighlightBanner
+import com.codandotv.streamplayerapp.feature_list_streams.list.presentation.widgets.StreamsCarouselContent
 
 data class ListStreamsUIState(
     val highlightBanner: HighlightBanner? = null,
-    val genres: List<Genre>,
+    val streamsCarouselContent: List<StreamsCarouselContent>,
     val isLoading: Boolean
 )

feature-list-streams/src/main/java/com/codandotv/streamplayerapp/feature_list_streams/list/presentation/widgets/StreamsCarousel.kt

@@ -10,7 +10,6 @@ import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.tooling.preview.Preview
@@ -23,21 +22,23 @@ import androidx.paging.compose.itemKey
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.emptyFlow
 
+data class StreamsCarouselContent(
+    val genreTitle: String,
+    val contentList: Flow<PagingData<StreamsCardContent>>
+)
+
 @Composable
 fun StreamsCarousel(
-    title: String,
-    contentList: Flow<PagingData<StreamsCardContent>>,
+    content: StreamsCarouselContent,
     modifier: Modifier = Modifier,
     onNavigateDetailList: (String) -> Unit = {},
 ) {
-    val flow = remember { contentList }
-
-    val lazyPagingItems = flow.collectAsLazyPagingItems()
+    val lazyPagingItems = content.contentList.collectAsLazyPagingItems()
     val lazyListState = rememberLazyListState()
 
     Column(modifier = modifier) {
         Text(
-            title,
+            content.genreTitle,
             style = MaterialTheme.typography.headlineMedium.copy(
                 fontWeight = FontWeight.Bold,
                 fontSize = 20.sp
@@ -73,7 +74,9 @@ fun StreamsCarousel(
 @Preview
 fun StreamsCarouselPreview() {
     StreamsCarousel(
-        title = "Ação",
-        contentList = emptyFlow()
+        content = StreamsCarouselContent(
+            genreTitle = "Ação",
+            contentList = emptyFlow()
+        )
     )
 }