Display "No result" when necessary

pillarbox-demo/src/main/java/ch/srgssr/pillarbox/demo/ui/integrationLayer/SearchView.kt

@@ -26,9 +26,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.focus.FocusRequester
@@ -53,14 +51,8 @@ private val bus = listOf(Bu.RTS, Bu.SRF, Bu.RSI, Bu.RTR, Bu.SWI)
 @Composable
 fun SearchView(searchViewModel: SearchViewModel, onSearchClicked: (Content.Media) -> Unit) {
     val lazyItems = searchViewModel.result.collectAsLazyPagingItems()
-    val currentBu = searchViewModel.bu.collectAsState()
-    val searchQuery = searchViewModel.query.collectAsState()
-    var queryState by remember(searchQuery.value) {
-        mutableStateOf(searchQuery.value)
-    }
-    LaunchedEffect(queryState) {
-        searchViewModel.query.value = queryState
-    }
+    val currentBu by searchViewModel.bu.collectAsState()
+    val searchQuery by searchViewModel.query.collectAsState()
     val focusRequester = remember { FocusRequester() }
     Column(
         modifier = Modifier.padding(8.dp),
@@ -81,8 +73,8 @@ fun SearchView(searchViewModel: SearchViewModel, onSearchClicked: (Content.Media
             singleLine = true,
             maxLines = 1,
             placeholder = { Text(text = "Search") },
-            value = queryState,
-            onValueChange = { queryState = it }
+            value = searchQuery,
+            onValueChange = searchViewModel::setQuery
         )
         if (lazyItems.itemCount == 0 && lazyItems.loadState.refresh is LoadState.NotLoading) {
             Box(
@@ -97,7 +89,7 @@ fun SearchView(searchViewModel: SearchViewModel, onSearchClicked: (Content.Media
         SearchResultList(
             lazyPagingItems = lazyItems,
             contentClick = onSearchClicked,
-            currentBu = currentBu.value,
+            currentBu = currentBu,
             buClicked = searchViewModel::selectBu
         )
     }
@@ -115,6 +107,10 @@ private fun SearchResultList(
     buClicked: (Bu) -> Unit,
     modifier: Modifier = Modifier
 ) {
+    val hasNoResult = lazyPagingItems.loadState.refresh is LoadState.NotLoading &&
+        lazyPagingItems.itemCount == 1 &&
+        lazyPagingItems[0] is SearchContent.BuSelector
+
     LazyColumn(modifier = modifier) {
         items(count = lazyPagingItems.itemCount, key = lazyPagingItems.itemKey()) { index ->
             val item = lazyPagingItems[index]
@@ -142,6 +138,15 @@ private fun SearchResultList(
                 }
             }
         }
+        if (hasNoResult) {
+            item {
+                NoResult(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(12.dp)
+                )
+            }
+        }
         if (lazyPagingItems.loadState.refresh is LoadState.Error) {
             item {
                 ErrorView(error = (lazyPagingItems.loadState.refresh as LoadState.Error).error)
@@ -174,6 +179,16 @@ private fun BuSelector(listBu: List<Bu>, selectedBu: Bu, onBuSelected: (Bu) -> U
     }
 }
 
+@Composable
+private fun NoResult(modifier: Modifier = Modifier) {
+    Box(
+        modifier = modifier,
+        contentAlignment = Alignment.Center
+    ) {
+        Text(text = "No result")
+    }
+}
+
 @Composable
 private fun LoadingView(modifier: Modifier = Modifier) {
     Box(modifier = modifier, contentAlignment = Alignment.Center) {

pillarbox-demo/src/main/java/ch/srgssr/pillarbox/demo/ui/integrationLayer/SearchViewModel.kt

@@ -19,10 +19,13 @@ import ch.srgssr.pillarbox.demo.ui.integrationLayer.data.ILRepository
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.debounce
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.flow.map
+import kotlin.time.Duration.Companion.milliseconds
 
 /**
  * Search view model to search media for the chosen bu
@@ -31,23 +34,28 @@ import kotlinx.coroutines.flow.map
  * @constructor Create empty Search view model
  */
 class SearchViewModel(private val ilRepository: ILRepository) : ViewModel() {
+    private val _bu = MutableStateFlow(Bu.RTS)
+
     /**
-     * Current  selected [Bu].
+     * Currently selected [Bu].
      */
-    val bu = MutableStateFlow(Bu.RTS)
+    val bu: StateFlow<Bu> = _bu
+
+    private val _query = MutableStateFlow("")
 
     /**
      * Current search query string.
      */
-    val query = MutableStateFlow("")
-    private val config = combine(bu, query) { bu, query -> Config(bu, query) }
+    val query: StateFlow<String> = _query
+
+    private val config = combine(bu, query) { bu, query -> Config(bu, query) }.debounce(600.milliseconds)
 
     /**
      * Result of the search trigger by [bu] and [query]
      */
     @OptIn(ExperimentalCoroutinesApi::class)
     val result: Flow<PagingData<SearchContent>> = config.flatMapLatest { config ->
-        if (config.query.isNotBlank() || config.query.length >= 3) {
+        if (config.query.length >= 3) {
             ilRepository.search(config.bu, config.query).map { mediaPagingData ->
                 val pagingData: PagingData<SearchContent> = mediaPagingData.map { item -> SearchContent.MediaResult(Content.Media(item)) }
                 pagingData.insertHeaderItem(item = SearchContent.BuSelector)
@@ -70,7 +78,16 @@ class SearchViewModel(private val ilRepository: ILRepository) : ViewModel() {
      * Clear search query parameter.
      */
     fun clear() {
-        query.value = ""
+        _query.value = ""
+    }
+
+    /**
+     * Set the search query.
+     *
+     * @param query The search query
+     */
+    fun setQuery(query: String) {
+        _query.value = query
     }
 
     /**
@@ -79,7 +96,7 @@ class SearchViewModel(private val ilRepository: ILRepository) : ViewModel() {
      * @param bu The [Bu] to select.
      */
     fun selectBu(bu: Bu) {
-        this.bu.value = bu
+        _bu.value = bu
     }
 
     internal data class Config(val bu: Bu, val query: String)