android, desktop: testing grouping of chat items

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/ChatItemGroups.kt

@@ -0,0 +1,60 @@
+package chat.simplex.common.views.chat
+
+import androidx.compose.runtime.snapshots.SnapshotStateList
+import chat.simplex.common.model.*
+
+data class SectionItems (
+  val mergeCategory: CIMergeCategory?,
+  val items: SnapshotStateList<ChatItem>,
+  val revealed: Boolean,
+  val showAvatar: MutableSet<Long>,
+)
+
+fun List<ChatItem>.putIntoGroups(revealedItems: Set<Long>): List<SectionItems> {
+  println("LALAL LENGTH ${size}")
+  val start = System.currentTimeMillis()
+  val groups = ArrayList<SectionItems>()
+  var recent: SectionItems = if (isNotEmpty()) {
+    val first = this[0]
+    SectionItems(
+      mergeCategory = first.mergeCategory,
+      items = SnapshotStateList<ChatItem>().also { it.add(first) },
+      revealed = first.mergeCategory == null || revealedItems.contains(first.id),
+      showAvatar = mutableSetOf<Long>().also { if (first.chatDir is CIDirection.GroupRcv) it.add(first.id) })
+  } else {
+    return emptyList()
+  }
+  groups.add(recent)
+  var prev = this[0]
+  var index = 0
+  while (index < size) {
+    if (index == 0) {
+      index++
+      continue
+    }
+    val item = this[index]
+    val category = item.mergeCategory
+    if (recent.mergeCategory == category) {
+      recent.items.add(item)
+      if (item.chatDir is CIDirection.GroupRcv && prev.chatDir is CIDirection.GroupRcv && item.chatDir.groupMember == (prev.chatDir as CIDirection.GroupRcv).groupMember) {
+        recent.showAvatar.add(item.id)
+      }
+    } else {
+      recent = SectionItems(
+        mergeCategory = item.mergeCategory,
+        items = SnapshotStateList<ChatItem>().also { it.add(item) },
+        revealed = item.mergeCategory == null || revealedItems.contains(item.id),
+        showAvatar = mutableSetOf<Long>().also {
+          if (item.chatDir is CIDirection.GroupRcv && (prev.chatDir !is CIDirection.GroupRcv || (prev.chatDir as CIDirection.GroupRcv).groupMember != item.chatDir.groupMember)) {
+            it.add(item.id)
+          }
+        }
+      )
+      groups.add(recent)
+    }
+    prev = item
+    index++
+  }
+  println("LALAL RES ${System.currentTimeMillis() - start}, groups: ${groups.size}")
+  return groups
+}

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/ChatView.kt

@@ -11,6 +11,7 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.*
 import androidx.compose.runtime.*
 import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.snapshots.AutoboxingStateValueProperty
 import androidx.compose.ui.*
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.drawWithCache
@@ -988,6 +989,8 @@ fun BoxWithConstraintsScope.ChatItemsList(
 
   Spacer(Modifier.size(8.dp))
   val reversedChatItems by remember { derivedStateOf { chatModel.chatItems.asReversed() } }
+  val revealedItems = rememberSaveable { mutableStateOf(setOf<Long>()) }
+  val groups by remember { derivedStateOf { (reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems + reversedChatItems).putIntoGroups(revealedItems.value) } }
   val maxHeightRounded = with(LocalDensity.current) { maxHeight.roundToPx() }
   val scrollToItem: (Long) -> Unit = { itemId: Long ->
     val index = reversedChatItems.indexOfFirst { it.id == itemId }
@@ -1011,8 +1014,8 @@ fun BoxWithConstraintsScope.ChatItemsList(
       VideoPlayerHolder.releaseAll()
     }
   )
-  LazyColumnWithScrollBar(Modifier.align(Alignment.BottomCenter), state = listState, reverseLayout = true) {
-    itemsIndexed(reversedChatItems, key = { _, item -> item.id to item.meta.createdAt.toEpochMilliseconds() }) { i, cItem ->
+    @Composable
+    fun ChatViewListItem(i: Int, showAvatar: Boolean, cItem: ChatItem) {
       CompositionLocalProvider(
         // Makes horizontal and vertical scrolling to coexist nicely.
         // With default touchSlop when you scroll LazyColumn, you can unintentionally open reply view
@@ -1104,7 +1107,7 @@ fun BoxWithConstraintsScope.ChatItemsList(
                   } else {
                     null to 1
                   }
-                if (prevItem == null || showMemberImage(member, prevItem) || prevMember != null) {
+                if (showMemberImage(member, prevItem) || showAvatar) {
                   Column(
                     Modifier
                       .padding(top = 8.dp)
@@ -1225,37 +1228,6 @@ fun BoxWithConstraintsScope.ChatItemsList(
             }
           }
         }
-
-        val (currIndex, nextItem) = chatModel.getNextChatItem(cItem)
-        val ciCategory = cItem.mergeCategory
-        if (ciCategory != null && ciCategory == nextItem?.mergeCategory) {
-          // memberConnected events and deleted items are aggregated at the last chat item in a row, see ChatItemView
-        } else {
-          val (prevHidden, prevItem) = chatModel.getPrevShownChatItem(currIndex, ciCategory)
-
-          val itemSeparation = getItemSeparation(cItem, nextItem)
-          val previousItemSeparation = if (prevItem != null) getItemSeparation(prevItem, cItem) else null
-
-          if (itemSeparation.date != null) {
-            DateSeparator(itemSeparation.date)
-          }
-
-          val range = chatViewItemsRange(currIndex, prevHidden)
-          if (revealed.value && range != null) {
-            reversedChatItems.subList(range.first, range.last + 1).forEachIndexed { index, ci ->
-              val prev = if (index + range.first == prevHidden) prevItem else reversedChatItems[index + range.first + 1]
-              ChatItemView(ci, null, prev, itemSeparation, previousItemSeparation)
-            }
-          } else {
-            ChatItemView(cItem, range, prevItem, itemSeparation, previousItemSeparation)
-          }
-
-          if (i == reversedChatItems.lastIndex) {
-            DateSeparator(cItem.meta.itemTs)
-          }
-        }
-
-
         if (cItem.isRcvNew && chatInfo.id == ChatModel.chatId.value) {
           LaunchedEffect(cItem.id) {
             scope.launch {
@@ -1264,6 +1236,29 @@ fun BoxWithConstraintsScope.ChatItemsList(
             }
           }
         }
+        val itemSeparation = getItemSeparation(cItem, null)
+        ChatItemView(cItem, null, null, itemSeparation, null)
+      }
+    }
+  LazyColumnWithScrollBar(Modifier.align(Alignment.BottomCenter), state = listState, reverseLayout = true) {
+    for (group in groups) {
+      if (group.revealed) {
+        itemsIndexed(group.items, key = { _, item -> (item.id to item.meta.createdAt.toEpochMilliseconds()).toString() }) { i, cItem ->
+          // index here is just temporary, should be removed at all or put in the section items
+          ChatViewListItem(reversedChatItems.indexOf(cItem), showAvatar = group.showAvatar.contains(cItem.id), cItem)
+        }
+      } else {
+        val item = group.items.last()
+        item(key = { (item.id to item.meta.createdAt.toEpochMilliseconds()).toString() }) {
+          // here you make one collapsed item from multiple items (should be already in section items)
+          ChatViewListItem(reversedChatItems.indexOf(item), showAvatar = group.showAvatar.contains(item.id), item)
+        }
+      }
+    }
+
+    if (reversedChatItems.isNotEmpty()) {
+      item {
+        DateSeparator(reversedChatItems.last().meta.itemTs)
       }
     }
   }

docs/protocol/simplex-chat.md

@@ -226,7 +226,7 @@ While introduced members establish connection inside group, inviting member forw
 
 ### Member roles
 
-Currently members can have one of three roles - `owner`, `admin`, `member` and `observer`. The user that created the group is self-assigned owner role, the new members are assigned role by the member who adds them - only `owner` and `admin` members can add new members; only `owner` members can add members with `owner` role. `Observer` members only receive messages and aren't allowed to send messages.
+Currently members can have one of four roles - `owner`, `admin`, `member` and `observer`. The user that created the group is self-assigned owner role, the new members are assigned role by the member who adds them - only `owner` and `admin` members can add new members; only `owner` members can add members with `owner` role. `Observer` members only receive messages and aren't allowed to send messages.
 
 ### Messages to manage groups and add members