Show a loader if all the Room Member are not yet loaded.

matrix-sdk-android-flow/src/main/java/org/matrix/android/sdk/flow/FlowRoom.kt

@@ -53,6 +53,13 @@ class FlowRoom(private val room: Room) {
                 }
     }
 
+    fun liveAreAllMembersLoaded(): Flow<Optional<Boolean>> {
+        return room.membershipService().areAllMembersLoadedLive().asFlow()
+                .startWith(room.coroutineDispatchers.io) {
+                    room.membershipService().areAllMembersLoaded().toOptional()
+                }
+    }
+
     fun liveAnnotationSummary(eventId: String): Flow<Optional<EventAnnotationsSummary>> {
         return room.relationService().getEventAnnotationsSummaryLive(eventId).asFlow()
                 .startWith(room.coroutineDispatchers.io) {

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/members/MembershipService.kt

@@ -19,6 +19,7 @@ package org.matrix.android.sdk.api.session.room.members
 import androidx.lifecycle.LiveData
 import org.matrix.android.sdk.api.session.identity.ThreePid
 import org.matrix.android.sdk.api.session.room.model.RoomMemberSummary
+import org.matrix.android.sdk.api.util.Optional
 
 /**
  * This interface defines methods to handling membership. It's implemented at the room level.
@@ -30,6 +31,20 @@ interface MembershipService {
      */
     suspend fun loadRoomMembersIfNeeded()
 
+    /**
+     * All the room members can be not loaded, for instance after an initial sync.
+     * All the members will be loaded when calling [loadRoomMembersIfNeeded], or when sending an encrypted
+     * event to the room.
+     * The fun let the app know if all the members have been loaded for this room.
+     * @return true if all the members are loaded, or false elsewhere.
+     */
+    suspend fun areAllMembersLoaded(): Boolean
+
+    /**
+     * Live version for [areAllMembersLoaded]
+     */
+    fun areAllMembersLoadedLive(): LiveData<Optional<Boolean>>
+
     /**
      * Return the roomMember with userId or null.
      * @param userId the userId param to look for

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/RoomModule.kt

@@ -59,7 +59,9 @@ import org.matrix.android.sdk.internal.session.room.location.SendLiveLocationTas
 import org.matrix.android.sdk.internal.session.room.location.SendStaticLocationTask
 import org.matrix.android.sdk.internal.session.room.location.StartLiveLocationShareTask
 import org.matrix.android.sdk.internal.session.room.location.StopLiveLocationShareTask
+import org.matrix.android.sdk.internal.session.room.membership.DefaultGetRoomMembersLoadStatusTask
 import org.matrix.android.sdk.internal.session.room.membership.DefaultLoadRoomMembersTask
+import org.matrix.android.sdk.internal.session.room.membership.GetRoomMembersLoadStatusTask
 import org.matrix.android.sdk.internal.session.room.membership.LoadRoomMembersTask
 import org.matrix.android.sdk.internal.session.room.membership.admin.DefaultMembershipAdminTask
 import org.matrix.android.sdk.internal.session.room.membership.admin.MembershipAdminTask
@@ -227,6 +229,9 @@ internal abstract class RoomModule {
     @Binds
     abstract fun bindLoadRoomMembersTask(task: DefaultLoadRoomMembersTask): LoadRoomMembersTask
 
+    @Binds
+    abstract fun bindGetRoomMembersLoadStatusTask(task: DefaultGetRoomMembersLoadStatusTask): GetRoomMembersLoadStatusTask
+
     @Binds
     abstract fun bindSetReadMarkersTask(task: DefaultSetReadMarkersTask): SetReadMarkersTask
 

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/membership/DefaultMembershipService.kt

@@ -17,6 +17,7 @@
 package org.matrix.android.sdk.internal.session.room.membership
 
 import androidx.lifecycle.LiveData
+import androidx.lifecycle.Transformations
 import com.zhuinden.monarchy.Monarchy
 import dagger.assisted.Assisted
 import dagger.assisted.AssistedFactory
@@ -28,9 +29,14 @@ import org.matrix.android.sdk.api.session.room.members.MembershipService
 import org.matrix.android.sdk.api.session.room.members.RoomMemberQueryParams
 import org.matrix.android.sdk.api.session.room.model.Membership
 import org.matrix.android.sdk.api.session.room.model.RoomMemberSummary
+import org.matrix.android.sdk.api.util.Optional
+import org.matrix.android.sdk.api.util.toOptional
 import org.matrix.android.sdk.internal.database.mapper.asDomain
+import org.matrix.android.sdk.internal.database.model.RoomEntity
 import org.matrix.android.sdk.internal.database.model.RoomMemberSummaryEntity
 import org.matrix.android.sdk.internal.database.model.RoomMemberSummaryEntityFields
+import org.matrix.android.sdk.internal.database.model.RoomMembersLoadStatusType
+import org.matrix.android.sdk.internal.database.query.where
 import org.matrix.android.sdk.internal.di.SessionDatabase
 import org.matrix.android.sdk.internal.di.UserId
 import org.matrix.android.sdk.internal.query.QueryStringValueProcessor
@@ -47,6 +53,7 @@ internal class DefaultMembershipService @AssistedInject constructor(
         private val inviteTask: InviteTask,
         private val inviteThreePidTask: InviteThreePidTask,
         private val membershipAdminTask: MembershipAdminTask,
+        private val getRoomMembersLoadStatusTask: GetRoomMembersLoadStatusTask,
         @UserId
         private val userId: String,
         private val queryStringValueProcessor: QueryStringValueProcessor
@@ -62,6 +69,26 @@ internal class DefaultMembershipService @AssistedInject constructor(
         loadRoomMembersTask.execute(params)
     }
 
+    override suspend fun areAllMembersLoaded(): Boolean {
+        val status = getRoomMembersLoadStatusTask.execute(GetRoomMembersLoadStatusTask.Params(roomId))
+        return status == RoomMembersLoadStatusType.LOADED
+    }
+
+    override fun areAllMembersLoadedLive(): LiveData<Optional<Boolean>> {
+        val liveData = monarchy.findAllMappedWithChanges(
+                {
+                    RoomEntity.where(it, roomId)
+                },
+                {
+                    it.membersLoadStatus == RoomMembersLoadStatusType.LOADED
+                }
+        )
+
+        return Transformations.map(liveData) { results ->
+            results.firstOrNull().toOptional()
+        }
+    }
+
     override fun getRoomMember(userId: String): RoomMemberSummary? {
         val roomMemberEntity = monarchy.fetchCopied {
             RoomMemberHelper(it, roomId).getLastRoomMember(userId)

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/membership/GetRoomMembersLoadStatusTask.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.internal.session.room.membership
+
+import com.zhuinden.monarchy.Monarchy
+import io.realm.Realm
+import org.matrix.android.sdk.internal.database.model.RoomEntity
+import org.matrix.android.sdk.internal.database.model.RoomMembersLoadStatusType
+import org.matrix.android.sdk.internal.database.query.where
+import org.matrix.android.sdk.internal.di.SessionDatabase
+import org.matrix.android.sdk.internal.task.Task
+import javax.inject.Inject
+
+internal interface GetRoomMembersLoadStatusTask : Task<GetRoomMembersLoadStatusTask.Params, RoomMembersLoadStatusType> {
+    data class Params(
+            val roomId: String,
+    )
+}
+
+internal class DefaultGetRoomMembersLoadStatusTask @Inject constructor(
+        @SessionDatabase private val monarchy: Monarchy,
+) : GetRoomMembersLoadStatusTask {
+
+    override suspend fun execute(params: GetRoomMembersLoadStatusTask.Params): RoomMembersLoadStatusType {
+        var result: RoomMembersLoadStatusType?
+        Realm.getInstance(monarchy.realmConfiguration).use {
+            result = RoomEntity.where(it, params.roomId).findFirst()?.membersLoadStatus
+        }
+        return result ?: RoomMembersLoadStatusType.NONE
+    }
+}

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/membership/LoadRoomMembersTask.kt

@@ -17,7 +17,6 @@
 package org.matrix.android.sdk.internal.session.room.membership
 
 import com.zhuinden.monarchy.Monarchy
-import io.realm.Realm
 import io.realm.kotlin.createObject
 import kotlinx.coroutines.TimeoutCancellationException
 import org.matrix.android.sdk.api.session.room.model.Membership
@@ -57,6 +56,7 @@ internal interface LoadRoomMembersTask : Task<LoadRoomMembersTask.Params, Unit>
 internal class DefaultLoadRoomMembersTask @Inject constructor(
         private val roomAPI: RoomAPI,
         @SessionDatabase private val monarchy: Monarchy,
+        private val getRoomMembersLoadStatusTask: GetRoomMembersLoadStatusTask,
         private val syncTokenStore: SyncTokenStore,
         private val roomSummaryUpdater: RoomSummaryUpdater,
         private val roomMemberEventHandler: RoomMemberEventHandler,
@@ -67,7 +67,7 @@ internal class DefaultLoadRoomMembersTask @Inject constructor(
 ) : LoadRoomMembersTask {
 
     override suspend fun execute(params: LoadRoomMembersTask.Params) {
-        when (getRoomMembersLoadStatus(params.roomId)) {
+        when (getRoomMembersLoadStatusTask.execute(GetRoomMembersLoadStatusTask.Params(params.roomId))) {
             RoomMembersLoadStatusType.NONE -> doRequest(params)
             RoomMembersLoadStatusType.LOADING -> waitPreviousRequestToFinish(params)
             RoomMembersLoadStatusType.LOADED -> Unit
@@ -136,14 +136,6 @@ internal class DefaultLoadRoomMembersTask @Inject constructor(
         }
     }
 
-    private fun getRoomMembersLoadStatus(roomId: String): RoomMembersLoadStatusType {
-        var result: RoomMembersLoadStatusType?
-        Realm.getInstance(monarchy.realmConfiguration).use {
-            result = RoomEntity.where(it, roomId).findFirst()?.membersLoadStatus
-        }
-        return result ?: RoomMembersLoadStatusType.NONE
-    }
-
     private suspend fun setRoomMembersLoadStatus(roomId: String, status: RoomMembersLoadStatusType) {
         monarchy.awaitTransaction { realm ->
             val roomEntity = RoomEntity.where(realm, roomId).findFirst() ?: realm.createObject(roomId)

vector/src/main/java/im/vector/app/features/roomprofile/members/RoomMemberListFragment.kt

@@ -21,6 +21,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.appcompat.widget.SearchView
+import androidx.core.view.isGone
 import androidx.core.view.isVisible
 import androidx.recyclerview.widget.RecyclerView
 import com.airbnb.mvrx.args
@@ -114,6 +115,7 @@ class RoomMemberListFragment @Inject constructor(
     }
 
     override fun invalidate() = withState(viewModel) { viewState ->
+        views.roomSettingGeneric.progressBar.isGone = viewState.areAllMembersLoaded
         roomMemberListController.setData(viewState)
         renderRoomSummary(viewState)
         views.inviteUsersButton.isVisible = viewState.actionsPermissions.canInvite

vector/src/main/java/im/vector/app/features/roomprofile/members/RoomMemberListViewModel.kt

@@ -28,6 +28,7 @@ import im.vector.app.core.platform.VectorViewModel
 import im.vector.app.features.powerlevel.PowerLevelsFlowFactory
 import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.map
@@ -66,6 +67,7 @@ class RoomMemberListViewModel @AssistedInject constructor(
     companion object : MavericksViewModelFactory<RoomMemberListViewModel, RoomMemberListViewState> by hiltMavericksViewModelFactory()
 
     private val room = session.getRoom(initialState.roomId)!!
+    private val roomFlow = room.flow()
 
     init {
         observeRoomMemberSummaries()
@@ -82,8 +84,8 @@ class RoomMemberListViewModel @AssistedInject constructor(
         }
 
         combine(
-                room.flow().liveRoomMembers(roomMemberQueryParams),
+                roomFlow.liveRoomMembers(roomMemberQueryParams),
-                room.flow()
+                roomFlow
                         .liveStateEvent(EventType.STATE_ROOM_POWER_LEVELS, QueryStringValue.IsEmpty)
                         .mapOptional { it.content.toModel<PowerLevelsContent>() }
                         .unwrap()
@@ -94,8 +96,20 @@ class RoomMemberListViewModel @AssistedInject constructor(
                     copy(roomMemberSummaries = async)
                 }
 
+        roomFlow.liveAreAllMembersLoaded()
+                .unwrap()
+                .distinctUntilChanged()
+                .onEach {
+                    setState {
+                        copy(
+                                areAllMembersLoaded = it
+                        )
+                    }
+                }
+                .launchIn(viewModelScope)
+
         if (room.roomCryptoService().isEncrypted()) {
-            room.flow().liveRoomMembers(roomMemberQueryParams)
+            roomFlow.liveRoomMembers(roomMemberQueryParams)
                     .flatMapLatest { membersSummary ->
                         session.cryptoService().getLiveCryptoDeviceInfo(membersSummary.map { it.userId })
                                 .asFlow()
@@ -138,7 +152,7 @@ class RoomMemberListViewModel @AssistedInject constructor(
     }
 
     private fun observeRoomSummary() {
-        room.flow().liveRoomSummary()
+        roomFlow.liveRoomSummary()
                 .unwrap()
                 .execute { async ->
                     copy(roomSummary = async)
@@ -146,7 +160,7 @@ class RoomMemberListViewModel @AssistedInject constructor(
     }
 
     private fun observeThirdPartyInvites() {
-        room.flow()
+        roomFlow
                 .liveStateEvents(setOf(EventType.STATE_ROOM_THIRD_PARTY_INVITE), QueryStringValue.IsNotNull)
                 .execute { async ->
                     copy(threePidInvites = async)

vector/src/main/java/im/vector/app/features/roomprofile/members/RoomMemberListViewState.kt

@@ -32,6 +32,7 @@ data class RoomMemberListViewState(
         val roomId: String,
         val roomSummary: Async<RoomSummary> = Uninitialized,
         val roomMemberSummaries: Async<RoomMemberSummaries> = Uninitialized,
+        val areAllMembersLoaded: Boolean = false,
         val ignoredUserIds: List<String> = emptyList(),
         val filter: String = "",
         val threePidInvites: Async<List<Event>> = Uninitialized,

vector/src/main/java/im/vector/app/features/spaces/people/SpacePeopleFragment.kt

@@ -20,6 +20,7 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.core.view.isGone
 import androidx.lifecycle.lifecycleScope
 import com.airbnb.mvrx.Fail
 import com.airbnb.mvrx.Loading
@@ -32,8 +33,6 @@ import im.vector.app.core.extensions.cleanup
 import im.vector.app.core.extensions.configureWith
 import im.vector.app.core.platform.OnBackPressed
 import im.vector.app.core.platform.VectorBaseFragment
-import im.vector.app.core.resources.ColorProvider
-import im.vector.app.core.resources.DrawableProvider
 import im.vector.app.databinding.FragmentRecyclerviewWithSearchBinding
 import im.vector.app.features.roomprofile.members.RoomMemberListAction
 import im.vector.app.features.roomprofile.members.RoomMemberListViewModel
@@ -45,8 +44,6 @@ import reactivecircus.flowbinding.appcompat.queryTextChanges
 import javax.inject.Inject
 
 class SpacePeopleFragment @Inject constructor(
-        private val drawableProvider: DrawableProvider,
-        private val colorProvider: ColorProvider,
         private val epoxyController: SpacePeopleListController
 ) : VectorBaseFragment<FragmentRecyclerviewWithSearchBinding>(),
         OnBackPressed, SpacePeopleListController.InteractionListener {
@@ -64,6 +61,7 @@ class SpacePeopleFragment @Inject constructor(
     }
 
     override fun invalidate() = withState(membersViewModel) { memberListState ->
+        views.progressBar.isGone = memberListState.areAllMembersLoaded
         val memberCount = (memberListState.roomSummary.invoke()?.otherMemberIds?.size ?: 0) + 1
 
         toolbar?.subtitle = resources.getQuantityString(R.plurals.room_title_members, memberCount, memberCount)

vector/src/main/res/layout/fragment_recyclerview_with_search.xml

@@ -27,8 +27,26 @@
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
             android:minHeight="0dp"
-            app:title="@string/bottom_action_people"
+            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap|enterAlways"
-            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap|enterAlways"/>
+            app:title="@string/bottom_action_people" />
+
+        <!-- Trick to remove surrounding padding (clip from wrapping frame) -->
+        <FrameLayout
+            android:id="@+id/progressBar"
+            android:layout_width="match_parent"
+            android:layout_height="3dp"
+            android:visibility="gone"
+            app:layout_constraintTop_toBottomOf="@id/appBarLayout"
+            tools:visibility="visible">
+
+            <ProgressBar
+                style="@style/Widget.Vector.ProgressBar.Horizontal"
+                android:layout_width="match_parent"
+                android:layout_height="14dp"
+                android:layout_gravity="center"
+                android:indeterminate="true" />
+
+        </FrameLayout>
 
         <androidx.appcompat.widget.SearchView
             android:id="@+id/memberNameFilter"
@@ -43,4 +61,4 @@
 
     </com.google.android.material.appbar.AppBarLayout>
 
-</androidx.coordinatorlayout.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

vector/src/main/res/layout/fragment_room_setting_generic.xml

@@ -113,6 +113,25 @@
 
         </com.google.android.material.appbar.AppBarLayout>
 
+        <!-- Trick to remove surrounding padding (clip from wrapping frame) -->
+        <FrameLayout
+            android:id="@+id/progressBar"
+            android:layout_width="match_parent"
+            android:layout_height="3dp"
+            android:elevation="8dp"
+            android:visibility="gone"
+            app:layout_constraintTop_toBottomOf="@id/appBarLayout"
+            tools:visibility="visible">
+
+            <ProgressBar
+                style="@style/Widget.Vector.ProgressBar.Horizontal"
+                android:layout_width="match_parent"
+                android:layout_height="14dp"
+                android:layout_gravity="center"
+                android:indeterminate="true" />
+
+        </FrameLayout>
+
     </androidx.coordinatorlayout.widget.CoordinatorLayout>
 
     <include