Timeline: add room summary holder to avoid fetching in item factory

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

@@ -71,6 +71,7 @@ import im.vector.riotx.features.command.ParsedCommand
 import im.vector.riotx.features.crypto.verification.SupportedVerificationMethodsProvider
 import im.vector.riotx.features.home.room.detail.composer.rainbow.RainbowGenerator
 import im.vector.riotx.features.home.room.detail.sticker.StickerPickerActionHandler
+import im.vector.riotx.features.home.room.detail.timeline.helper.RoomSummaryHolder
 import im.vector.riotx.features.home.room.detail.timeline.helper.TimelineDisplayableEvents
 import im.vector.riotx.features.home.room.typing.TypingHelper
 import im.vector.riotx.features.powerlevel.PowerLevelsObservableFactory
@@ -96,7 +97,8 @@ class RoomDetailViewModel @AssistedInject constructor(
         private val rainbowGenerator: RainbowGenerator,
         private val session: Session,
         private val supportedVerificationMethodsProvider: SupportedVerificationMethodsProvider,
-        private val stickerPickerActionHandler: StickerPickerActionHandler
+        private val stickerPickerActionHandler: StickerPickerActionHandler,
+        private val roomSummaryHolder: RoomSummaryHolder
 ) : VectorViewModel<RoomDetailViewState, RoomDetailAction, RoomDetailViewEvents>(initialState), Timeline.Listener {
 
     private val room = session.getRoom(initialState.roomId)!!
@@ -1065,6 +1067,7 @@ class RoomDetailViewModel @AssistedInject constructor(
 
     private fun observeSummaryState() {
         asyncSubscribe(RoomDetailViewState::asyncRoomSummary) { summary ->
+            roomSummaryHolder.set(summary)
             if (summary.membership == Membership.INVITE) {
                 summary.inviterId?.let { inviterId ->
                     session.getUser(inviterId)
@@ -1094,6 +1097,7 @@ class RoomDetailViewModel @AssistedInject constructor(
     }
 
     override fun onCleared() {
+        roomSummaryHolder.clear()
         timeline.dispose()
         timeline.removeAllListeners()
         if (vectorPreferences.sendTypingNotifs()) {

vector/src/main/java/im/vector/riotx/features/home/room/detail/timeline/helper/MessageInformationDataFactory.kt

@@ -22,7 +22,6 @@ import im.vector.matrix.android.api.extensions.orFalse
 import im.vector.matrix.android.api.session.Session
 import im.vector.matrix.android.api.session.events.model.EventType
 import im.vector.matrix.android.api.session.events.model.toModel
-import im.vector.matrix.android.api.session.room.Room
 import im.vector.matrix.android.api.session.room.model.ReferencesAggregatedContent
 import im.vector.matrix.android.api.session.room.model.message.MessageVerificationRequestContent
 import im.vector.matrix.android.api.session.room.send.SendState
@@ -49,6 +48,7 @@ import javax.inject.Inject
  * This class compute if data of an event (such has avatar, display name, ...) should be displayed, depending on the previous event in the timeline
  */
 class MessageInformationDataFactory @Inject constructor(private val session: Session,
+                                                        private val roomSummaryHolder: RoomSummaryHolder,
                                                         private val dateFormatter: VectorDateFormatter,
                                                         private val colorProvider: ColorProvider) {
 
@@ -75,8 +75,7 @@ class MessageInformationDataFactory @Inject constructor(private val session: Ses
             textColor = colorProvider.getColor(getColorFromUserId(event.root.senderId))
         }
 
-        val room = event.root.roomId?.let { session.getRoom(it) }
-        val e2eDecoration = getE2EDecoration(room, event)
+        val e2eDecoration = getE2EDecoration(event)
         return MessageInformationData(
                 eventId = eventId,
                 senderId = event.root.senderId ?: "",
@@ -121,13 +120,14 @@ class MessageInformationDataFactory @Inject constructor(private val session: Ses
         )
     }
 
-    private fun getE2EDecoration(room: Room?, event: TimelineEvent): E2EDecoration {
+    private fun getE2EDecoration(event: TimelineEvent): E2EDecoration {
+        val roomSummary = roomSummaryHolder.roomSummary
         return if (
                 event.root.sendState == SendState.SYNCED
-                && room?.isEncrypted() == true
+                && roomSummary?.isEncrypted.orFalse()
                 // is user verified
                 && session.cryptoService().crossSigningService().getUserCrossSigningKeys(event.root.senderId ?: "")?.isTrusted() == true) {
-            val ts = room.roomSummary()?.encryptionEventTs ?: 0
+            val ts = roomSummary?.encryptionEventTs ?: 0
             val eventTs = event.root.originServerTs ?: 0
             if (event.isEncrypted()) {
                 // Do not decorate failed to decrypt, or redaction (we lost sender device info)

vector/src/main/java/im/vector/riotx/features/home/room/detail/timeline/helper/RoomSummaryHolder.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * 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 im.vector.riotx.features.home.room.detail.timeline.helper
+
+import im.vector.matrix.android.api.session.room.model.RoomSummary
+import im.vector.riotx.core.di.ScreenScope
+import javax.inject.Inject
+
+/*
+    This holds an instance of the current room summary.
+    You should use this in the context of the timeline.
+ */
+@ScreenScope
+class RoomSummaryHolder @Inject constructor() {
+
+    var roomSummary: RoomSummary? = null
+        private set
+
+    fun set(roomSummary: RoomSummary) {
+        this.roomSummary = roomSummary
+    }
+
+    fun clear() {
+        roomSummary = null
+    }
+}