Read receipts : start to query them when item become visible... not sure it's the right way to do.

app/src/main/java/im/vector/riotredesign/features/home/room/detail/RoomDetailViewModel.kt

@@ -89,6 +89,7 @@ class RoomDetailViewModel(initialState: RoomDetailViewState,
 
     private fun handleEventDisplayed(action: RoomDetailActions.EventDisplayed) {
         displayedEventsObservable.accept(action)
+
     }
 
     private fun handleIsDisplayed() {
@@ -102,6 +103,18 @@ class RoomDetailViewModel(initialState: RoomDetailViewState,
                 .buffer(1, TimeUnit.SECONDS)
                 .filter { it.isNotEmpty() }
                 .subscribeBy(onNext = { actions ->
+                    val eventIds = actions.mapNotNull { it.event.root.eventId }
+                    withState { state ->
+                        val newMapOfReadReceipts = HashMap(state.readReceiptsForEventId)
+                        eventIds.forEach {
+                            if (newMapOfReadReceipts.containsKey(it).not()) {
+                                val readReceipts = room.readReceipts(it)
+                                newMapOfReadReceipts[it] = readReceipts
+                            }
+                        }
+                        setState { copy(readReceiptsForEventId = newMapOfReadReceipts) }
+                    }
+
                     val mostRecentEvent = actions.lastMinBy { it.index }
                     mostRecentEvent?.event?.root?.eventId?.let { eventId ->
                         room.setReadReceipt(eventId, callback = object : MatrixCallback<Void> {})

app/src/main/java/im/vector/riotredesign/features/home/room/detail/RoomDetailViewState.kt

@@ -19,12 +19,14 @@ package im.vector.riotredesign.features.home.room.detail
 import com.airbnb.mvrx.Async
 import com.airbnb.mvrx.MvRxState
 import com.airbnb.mvrx.Uninitialized
+import im.vector.matrix.android.api.session.room.model.ReadReceipt
 import im.vector.matrix.android.api.session.room.model.RoomSummary
 import im.vector.matrix.android.api.session.room.timeline.TimelineData
 
 data class RoomDetailViewState(
         val roomId: String,
         val eventId: String?,
+        val readReceiptsForEventId: Map<String, List<ReadReceipt>> = emptyMap(),
         val asyncRoomSummary: Async<RoomSummary> = Uninitialized,
         val asyncTimelineData: Async<TimelineData> = Uninitialized
 ) : MvRxState {

app/src/main/res/layout/item_timeline_event_text_message.xml

@@ -60,13 +60,4 @@
         app:layout_constraintTop_toBottomOf="@+id/messageMemberNameView"
         tools:text="Alright finished work, heading there in about 20 mins…
Ping me when you’re outside" />
 
-    <include
-        android:id="@+id/messageReadReceipts"
-        layout="@layout/item_timeline_read_receipts"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/messageTextView"/>
-
 </androidx.constraintlayout.widget.ConstraintLayout>

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/read/ReadService.kt

@@ -46,10 +46,10 @@ interface ReadService {
     fun readReceipts(): LiveData<List<ReadReceipt>>
 
     /**
-     * @param eventId to look for receipt.
-     * * @return the receipt associated or null
+     * @param eventId to look for receipts.
+     * * @return the list of receipts associated with the eventId
      */
-    fun readReceipt(eventId: String): ReadReceipt?
+    fun readReceipts(eventId: String): List<ReadReceipt>
 
     /**
      * A listener defined at the room level to listen for some read events.

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/query/ReadReceiptEntityQueries.kt

@@ -31,4 +31,4 @@ internal fun ReadReceiptEntity.Companion.where(realm: Realm, roomId: String, use
 internal fun ReadReceiptEntity.Companion.where(realm: Realm, roomId: String): RealmQuery<ReadReceiptEntity> {
     return realm.where<ReadReceiptEntity>()
             .equalTo(ReadReceiptEntityFields.ROOM_ID, roomId)
-}
+}

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/read/DefaultReadService.kt

@@ -24,6 +24,7 @@ import im.vector.matrix.android.api.session.room.model.ReadReceipt
 import im.vector.matrix.android.api.session.room.read.ReadService
 import im.vector.matrix.android.internal.database.model.EventEntity
 import im.vector.matrix.android.internal.database.model.ReadReceiptEntity
+import im.vector.matrix.android.internal.database.model.ReadReceiptEntityFields
 import im.vector.matrix.android.internal.database.query.latestEvent
 import im.vector.matrix.android.internal.database.query.where
 import im.vector.matrix.android.internal.task.TaskExecutor
@@ -62,10 +63,16 @@ internal class DefaultReadService(private val roomId: String,
         )
     }
 
-    override fun readReceipt(eventId: String): ReadReceipt? {
-        val readReceipt = monarchy.fetchCopied { ReadReceiptEntity.where(it, roomId).findFirst() }
-                          ?: return null
-        val roomMember = roomMembersService.getRoomMember(readReceipt.userId)
-        return ReadReceipt(roomMember, readReceipt.eventId, readReceipt.originServerTs.toLong())
+    override fun readReceipts(eventId: String): List<ReadReceipt> {
+        return monarchy.fetchAllMappedSync(
+                { realm ->
+                    ReadReceiptEntity.where(realm, roomId)
+                            .equalTo(ReadReceiptEntityFields.EVENT_ID, eventId)
+                },
+                {
+                    val roomMember = roomMembersService.getRoomMember(it.userId)
+                    ReadReceipt(roomMember, it.eventId, it.originServerTs.toLong())
+                }
+        )
     }
 }