Timeline: compute group position

features/messages/src/main/java/io/element/android/x/features/messages/MessagesScreen.kt

@@ -149,7 +149,7 @@ fun MessageEventRow(
                 Spacer(modifier = Modifier.width(16.dp))
             }
             Column {
-                if (messageEvent.groupPosition.showSenderInformation() && !messageEvent.isMine) {
+                if (messageEvent.showSenderInformation) {
                     MessageSenderInformation(messageEvent.sender, messageEvent.senderAvatar)
                 }
                 MessageEventBubble(messageEvent)

features/messages/src/main/java/io/element/android/x/features/messages/MessagesViewModel.kt

@@ -73,9 +73,20 @@ class MessagesViewModel(
                     val currentTimelineItem = timelineItems[index]
                     val timelineItemState = when (currentTimelineItem) {
                         is MatrixTimelineItem.Event -> {
-                            val prevTimelineItem = timelineItems.getOrNull(index - 1)
+                            val prevTimelineItem =
-                            val nextTimelineItem = timelineItems.getOrNull(index + 1)
+                                timelineItems.getOrNull(index - 1) as? MatrixTimelineItem.Event
+                            val nextTimelineItem =
+                                timelineItems.getOrNull(index + 1) as? MatrixTimelineItem.Event
+                            val currentSender = currentTimelineItem.event.sender()
+                            val previousSender = prevTimelineItem?.event?.sender()
+                            val nextSender = nextTimelineItem?.event?.sender()
 
+                            val groupPosition = when {
+                                previousSender != currentSender && nextSender == currentSender -> MessagesItemGroupPosition.First
+                                previousSender == currentSender && nextSender == currentSender -> MessagesItemGroupPosition.Middle
+                                previousSender == currentSender && nextSender != currentSender -> MessagesItemGroupPosition.Last
+                                else -> MessagesItemGroupPosition.None
+                            }
                             val messageType =
                                 currentTimelineItem.event.content().asMessage()?.msgtype()
                             val contentStr = when (messageType) {
@@ -91,7 +102,7 @@ class MessagesViewModel(
                                 sender = currentTimelineItem.event.sender(),
                                 content = contentStr,
                                 isMine = currentTimelineItem.event.sender() == client.userId().value,
-                                groupPosition = MessagesItemGroupPosition.None
+                                groupPosition = groupPosition
                             )
                         }
                         is MatrixTimelineItem.Virtual -> MessagesTimelineItemState.Virtual(

features/messages/src/main/java/io/element/android/x/features/messages/model/MessagesItemGroupPosition.kt

@@ -6,12 +6,4 @@ sealed interface MessagesItemGroupPosition {
     object Last : MessagesItemGroupPosition
     object None : MessagesItemGroupPosition
 
-    fun showSenderInformation(): Boolean {
-        return when (this) {
-            First, None -> true
-            else -> false
-        }
-    }
-
-
 }

features/messages/src/main/java/io/element/android/x/features/messages/model/MessagesTimelineItemState.kt

@@ -15,7 +15,13 @@ sealed interface MessagesTimelineItemState {
         val sentTime: String = "",
         val isMine: Boolean = false,
         val groupPosition: MessagesItemGroupPosition = MessagesItemGroupPosition.None
-    ) : MessagesTimelineItemState
+    ) : MessagesTimelineItemState {
+
+        val showSenderInformation: Boolean = when (groupPosition) {
+            MessagesItemGroupPosition.First, MessagesItemGroupPosition.None -> !isMine
+            else -> false
+        }
+    }
 
 }
 

features/messages/src/main/java/io/element/android/x/features/messages/model/MessagesViewState.kt

@@ -21,4 +21,8 @@ data class MessagesViewState(
         roomAvatar = null
     )
 
+
+
+
+
 }