Add reactions feed to compose calling screen.

Author: alex-signal

app/src/main/java/org/thoughtcrime/securesms/components/webrtc/v2/CallScreen.kt

@@ -60,6 +60,7 @@ import org.signal.core.ui.TriggerAlignedPopupState
 import org.signal.core.util.DimensionUnit
 import org.thoughtcrime.securesms.components.webrtc.WebRtcLocalRenderState
 import org.thoughtcrime.securesms.events.CallParticipant
+import org.thoughtcrime.securesms.events.GroupCallReactionEvent
 import org.thoughtcrime.securesms.events.WebRtcViewModel
 import org.thoughtcrime.securesms.recipients.Recipient
 import kotlin.math.max
@@ -94,6 +95,7 @@ fun CallScreen(
   localParticipant: CallParticipant,
   localRenderState: WebRtcLocalRenderState,
   callScreenDialogType: CallScreenDialogType,
+  reactions: List<GroupCallReactionEvent>,
   callInfoView: @Composable (Float) -> Unit,
   raiseHandSnackbar: @Composable (Modifier) -> Unit,
   onNavigationClick: () -> Unit,
@@ -234,6 +236,10 @@ fun CallScreen(
             callScreenController = callScreenController
           )
         }
+
+        CallScreenReactionsContainer(
+          reactions = reactions
+        )
       }
 
       val onCallInfoClick: () -> Unit = {
@@ -545,7 +551,8 @@ private fun CallScreenPreview() {
       onNavigationClick = {},
       onLocalPictureInPictureClicked = {},
       overflowParticipants = emptyList(),
-      onControlsToggled = {}
+      onControlsToggled = {},
+      reactions = emptyList()
     )
   }
 }

app/src/main/java/org/thoughtcrime/securesms/components/webrtc/v2/CallScreenReactionsContainer.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2025 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.components.webrtc.v2
+
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.viewinterop.AndroidView
+import androidx.recyclerview.widget.LinearLayoutManager
+import org.thoughtcrime.securesms.components.recyclerview.NoTouchingRecyclerView
+import org.thoughtcrime.securesms.components.webrtc.WebRtcReactionsAlphaItemDecoration
+import org.thoughtcrime.securesms.components.webrtc.WebRtcReactionsItemAnimator
+import org.thoughtcrime.securesms.components.webrtc.WebRtcReactionsRecyclerAdapter
+import org.thoughtcrime.securesms.events.GroupCallReactionEvent
+
+/**
+ * Displays a list of reactions sent during a group call.
+ *
+ * Due to how LazyColumn deals with touch events and how Column doesn't have proper
+ * per-item animation support, we utilize a recycler view as we do in the old call
+ * screen.
+ */
+@Composable
+fun CallScreenReactionsContainer(
+  reactions: List<GroupCallReactionEvent>
+) {
+  val adapter = remember { WebRtcReactionsRecyclerAdapter() }
+  AndroidView(factory = {
+    val view = NoTouchingRecyclerView(it)
+    view.layoutManager = LinearLayoutManager(it, LinearLayoutManager.VERTICAL, true)
+    view.adapter = adapter
+    view.addItemDecoration(WebRtcReactionsAlphaItemDecoration())
+    view.itemAnimator = WebRtcReactionsItemAnimator()
+    view.isClickable = false
+    view.isVerticalScrollBarEnabled = false
+
+    view
+  }, modifier = Modifier.fillMaxSize().padding(16.dp).padding(bottom = 16.dp)) {
+    adapter.submitList(reactions.toMutableList())
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/components/webrtc/v2/ComposeCallScreenMediator.kt

@@ -133,6 +133,7 @@ class ComposeCallScreenMediator(private val activity: WebRtcCallActivity, viewMo
           overflowParticipants = callParticipantsState.listParticipants,
           localParticipant = callParticipantsState.localParticipant,
           localRenderState = callParticipantsState.localRenderState,
+          reactions = callParticipantsState.reactions,
           callScreenDialogType = dialog,
           callInfoView = {
             CallInfoView.View(