Room directory : fix pagination and add empty state.

features/roomdirectory/impl/src/main/kotlin/io/element/android/features/roomdirectory/impl/root/RoomDirectoryEvents.kt

@@ -22,5 +22,4 @@ sealed interface RoomDirectoryEvents {
     data class Search(val query: String) : RoomDirectoryEvents
     data object LoadMore : RoomDirectoryEvents
     data class JoinRoom(val roomId: RoomId) : RoomDirectoryEvents
-    data class SearchActiveChange(val isActive: Boolean) : RoomDirectoryEvents
 }

features/roomdirectory/impl/src/main/kotlin/io/element/android/features/roomdirectory/impl/root/RoomDirectoryPresenter.kt

@@ -26,14 +26,11 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
-import io.element.android.features.roomdirectory.impl.root.model.RoomDescriptionUiModel
 import io.element.android.features.roomdirectory.impl.root.model.toUiModel
 import io.element.android.libraries.architecture.Presenter
-import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
 import io.element.android.libraries.matrix.api.MatrixClient
 import io.element.android.libraries.matrix.api.roomdirectory.RoomDirectoryList
 import io.element.android.libraries.matrix.api.roomdirectory.RoomDirectoryService
-import kotlinx.collections.immutable.ImmutableList
 import kotlinx.collections.immutable.persistentListOf
 import kotlinx.collections.immutable.toImmutableList
 import kotlinx.coroutines.Dispatchers
@@ -76,9 +73,6 @@ class RoomDirectoryPresenter @Inject constructor(
                 is RoomDirectoryEvents.Search -> {
                     searchQuery = event.query
                 }
-                is RoomDirectoryEvents.SearchActiveChange -> {
-
-                }
             }
         }
 
@@ -90,23 +84,6 @@ class RoomDirectoryPresenter @Inject constructor(
         )
     }
 
-    @Composable
-    private fun searchResults(
-        filteredRooms: ImmutableList<RoomDescriptionUiModel>,
-        hasMoreToLoad: Boolean,
-        isSearchActive: Boolean,
-    ): SearchBarResultState<ImmutableList<RoomDescriptionUiModel>> {
-        return if (!isSearchActive) {
-            SearchBarResultState.Initial()
-        } else {
-            if (filteredRooms.isEmpty() && !hasMoreToLoad) {
-                SearchBarResultState.NoResultsFound()
-            } else {
-                SearchBarResultState.Results(filteredRooms)
-            }
-        }
-    }
-
     @Composable
     private fun RoomDirectoryList.collectItemsAsState() = remember {
         items.map { list ->

features/roomdirectory/impl/src/main/kotlin/io/element/android/features/roomdirectory/impl/root/RoomDirectoryView.kt

@@ -17,6 +17,7 @@
 package io.element.android.features.roomdirectory.impl.root
 
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.IntrinsicSize
 import androidx.compose.foundation.layout.Row
@@ -26,6 +27,7 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.wrapContentHeight
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.text.KeyboardActions
@@ -33,6 +35,7 @@ import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.TextFieldColors
 import androidx.compose.material3.TextFieldDefaults
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
@@ -49,6 +52,7 @@ import io.element.android.libraries.designsystem.components.button.BackButton
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.theme.aliasScreenTitle
+import io.element.android.libraries.designsystem.theme.components.CircularProgressIndicator
 import io.element.android.libraries.designsystem.theme.components.Icon
 import io.element.android.libraries.designsystem.theme.components.IconButton
 import io.element.android.libraries.designsystem.theme.components.Scaffold
@@ -77,8 +81,8 @@ fun RoomDirectoryView(
                     state.eventSink(RoomDirectoryEvents.JoinRoom(roomId))
                 },
                 modifier = Modifier
-                    .padding(padding)
-                    .consumeWindowInsets(padding)
+                        .padding(padding)
+                        .consumeWindowInsets(padding)
             )
         }
     )
@@ -119,7 +123,10 @@ private fun RoomDirectoryContent(
         )
         RoomDirectoryRoomList(
             roomDescriptions = state.roomDescriptions,
+            displayLoadMoreIndicator = state.displayLoadMoreIndicator,
+            displayEmptyState = state.displayEmptyState,
             onResultClicked = onResultClicked,
+            onReachedLoadMore = { state.eventSink(RoomDirectoryEvents.LoadMore) },
         )
     }
 }
@@ -127,18 +134,52 @@ private fun RoomDirectoryContent(
 @Composable
 private fun RoomDirectoryRoomList(
     roomDescriptions: ImmutableList<RoomDescriptionUiModel>,
+    displayLoadMoreIndicator: Boolean,
+    displayEmptyState: Boolean,
     onResultClicked: (RoomId) -> Unit,
+    onReachedLoadMore: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
-    LazyColumn(
-        modifier = modifier,
-    ) {
+    LazyColumn(modifier = modifier) {
         items(roomDescriptions) { roomDescription ->
             RoomDirectoryRoomRow(
                 roomDescription = roomDescription,
                 onClick = onResultClicked,
             )
         }
+        if (displayEmptyState) {
+            item {
+                Text(
+                    text = stringResource(id = CommonStrings.common_no_results),
+                    style = ElementTheme.typography.fontBodyLgRegular,
+                    color = ElementTheme.colors.textPlaceholder,
+                    modifier = Modifier.padding(16.dp)
+                )
+            }
+        }
+        if (displayLoadMoreIndicator) {
+            item {
+                LoadMoreIndicator(modifier = Modifier.fillMaxWidth())
+                LaunchedEffect(Unit) {
+                    onReachedLoadMore()
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun LoadMoreIndicator(modifier: Modifier = Modifier) {
+    Box(
+            modifier
+                    .fillMaxWidth()
+                    .wrapContentHeight()
+                    .padding(8.dp),
+        contentAlignment = Alignment.Center,
+    ) {
+        CircularProgressIndicator(
+            strokeWidth = 2.dp,
+        )
     }
 }
 
@@ -203,14 +244,14 @@ private fun RoomDirectoryRoomRow(
 ) {
     Row(
         modifier = modifier
-            .fillMaxWidth()
-            .clickable { onClick(roomDescription.roomId) }
-            .padding(
-                top = 12.dp,
-                bottom = 12.dp,
-                start = 16.dp,
-            )
-            .height(IntrinsicSize.Min),
+                .fillMaxWidth()
+                .clickable { onClick(roomDescription.roomId) }
+                .padding(
+                        top = 12.dp,
+                        bottom = 12.dp,
+                        start = 16.dp,
+                )
+                .height(IntrinsicSize.Min),
     ) {
         Avatar(
             avatarData = roomDescription.avatarData,
@@ -218,8 +259,8 @@ private fun RoomDirectoryRoomRow(
         )
         Column(
             modifier = Modifier
-                .weight(1f)
-                .padding(start = 16.dp)
+                    .weight(1f)
+                    .padding(start = 16.dp)
         ) {
             Text(
                 text = roomDescription.name,
@@ -241,8 +282,8 @@ private fun RoomDirectoryRoomRow(
                 text = stringResource(id = CommonStrings.action_join),
                 color = ElementTheme.colors.textSuccessPrimary,
                 modifier = Modifier
-                    .align(Alignment.CenterVertically)
-                    .padding(start = 4.dp, end = 12.dp)
+                        .align(Alignment.CenterVertically)
+                        .padding(start = 4.dp, end = 12.dp)
             )
         } else {
             Spacer(modifier = Modifier.width(24.dp))

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/roomdirectory/RoomDirectoryList.kt

@@ -19,8 +19,8 @@ package io.element.android.libraries.matrix.api.roomdirectory
 import kotlinx.coroutines.flow.Flow
 
 interface RoomDirectoryList {
-    suspend fun filter(filter: String?, batchSize: Int)
-    suspend fun loadMore()
+    suspend fun filter(filter: String?, batchSize: Int): Result<Unit>
+    suspend fun loadMore(): Result<Unit>
     suspend fun hasMoreToLoad(): Boolean
     val items: Flow<List<RoomDescription>>
 }

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/roomdirectory/RoomDirectorySearchProcessor.kt

@@ -42,27 +42,27 @@ class RoomDirectorySearchProcessor(
         }
     }
 
-    private suspend fun MutableList<RoomDescription>.applyUpdate(update: RoomDirectorySearchEntryUpdate) {
+    private fun MutableList<RoomDescription>.applyUpdate(update: RoomDirectorySearchEntryUpdate) {
         when (update) {
             is RoomDirectorySearchEntryUpdate.Append -> {
                 val roomSummaries = update.values.map(roomDescriptionMapper::map)
                 addAll(roomSummaries)
             }
             is RoomDirectorySearchEntryUpdate.PushBack -> {
-                val roomSummary = roomDescriptionMapper.map(update.value)
-                add(roomSummary)
+                val roomDescription = roomDescriptionMapper.map(update.value)
+                add(roomDescription)
             }
             is RoomDirectorySearchEntryUpdate.PushFront -> {
-                val roomSummary = roomDescriptionMapper.map(update.value)
-                add(0, roomSummary)
+                val roomDescription = roomDescriptionMapper.map(update.value)
+                add(0, roomDescription)
             }
             is RoomDirectorySearchEntryUpdate.Set -> {
-                val roomSummary = roomDescriptionMapper.map(update.value)
-                this[update.index.toInt()] = roomSummary
+                val roomDescription = roomDescriptionMapper.map(update.value)
+                this[update.index.toInt()] = roomDescription
             }
             is RoomDirectorySearchEntryUpdate.Insert -> {
-                val roomSummary = roomDescriptionMapper.map(update.value)
-                add(update.index.toInt(), roomSummary)
+                val roomDescription = roomDescriptionMapper.map(update.value)
+                add(update.index.toInt(), roomDescription)
             }
             is RoomDirectorySearchEntryUpdate.Remove -> {
                 removeAt(update.index.toInt())

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/roomdirectory/RustRoomDirectoryList.kt

@@ -18,6 +18,7 @@ package io.element.android.libraries.matrix.impl.roomdirectory
 
 import io.element.android.libraries.matrix.api.roomdirectory.RoomDescription
 import io.element.android.libraries.matrix.api.roomdirectory.RoomDirectoryList
+import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.FlowPreview
@@ -32,12 +33,11 @@ import org.matrix.rustcomponents.sdk.RoomDirectorySearch as InnerRoomDirectorySe
 
 class RustRoomDirectoryList(
     private val inner: InnerRoomDirectorySearch,
-    private val sessionCoroutineScope: CoroutineScope,
-    private val sessionDispatcher: CoroutineDispatcher,
+    sessionCoroutineScope: CoroutineScope,
+    sessionDispatcher: CoroutineDispatcher,
 ) : RoomDirectoryList {
 
-    private val _items = MutableSharedFlow<List<RoomDescription>>()
-
+    private val _items = MutableSharedFlow<List<RoomDescription>>(replay = 1)
     private val processor = RoomDirectorySearchProcessor(_items, sessionDispatcher, RoomDescriptionMapper())
 
     init {
@@ -51,12 +51,26 @@ class RustRoomDirectoryList(
         }
     }
 
-    override suspend fun filter(filter: String?, batchSize: Int) {
-        inner.search(filter, batchSize.toUInt())
+    override suspend fun filter(filter: String?, batchSize: Int): Result<Unit> {
+        return try {
+            inner.search(filter = filter, batchSize = batchSize.toUInt())
+            Result.success(Unit)
+        } catch (e: CancellationException) {
+            throw e
+        } catch (e: Exception) {
+            Result.failure(e)
+        }
     }
 
-    override suspend fun loadMore() {
-        inner.nextPage()
+    override suspend fun loadMore(): Result<Unit> {
+        return try {
+            inner.nextPage()
+            Result.success(Unit)
+        } catch (e: CancellationException) {
+            throw e
+        } catch (e: Exception) {
+            Result.failure(e)
+        }
     }
 
     override suspend fun hasMoreToLoad(): Boolean {