Initial raise hand support.

app/src/main/java/org/thoughtcrime/securesms/events/CallParticipant.kt

@@ -16,6 +16,7 @@ data class CallParticipant constructor(
   val isForwardingVideo: Boolean = true,
   val isVideoEnabled: Boolean = false,
   val isMicrophoneEnabled: Boolean = false,
+  val isHandRaised: Boolean = false,
   val lastSpoke: Long = 0,
   val audioLevel: AudioLevel? = null,
   val isMediaKeysReceived: Boolean = true,
@@ -109,7 +110,8 @@ data class CallParticipant constructor(
     fun createLocal(
       cameraState: CameraState,
       renderer: BroadcastVideoSink,
-      microphoneEnabled: Boolean
+      microphoneEnabled: Boolean,
+      isHandRaised: Boolean
     ): CallParticipant {
       return CallParticipant(
         callParticipantId = CallParticipantId(Recipient.self()),
@@ -117,7 +119,8 @@ data class CallParticipant constructor(
         videoSink = renderer,
         cameraState = cameraState,
         isVideoEnabled = cameraState.isEnabled && cameraState.cameraCount > 0,
-        isMicrophoneEnabled = microphoneEnabled
+        isMicrophoneEnabled = microphoneEnabled,
+        isHandRaised = isHandRaised
       )
     }
 
@@ -130,6 +133,7 @@ data class CallParticipant constructor(
       isForwardingVideo: Boolean,
       audioEnabled: Boolean,
       videoEnabled: Boolean,
+      isHandRaised: Boolean,
       lastSpoke: Long,
       mediaKeysReceived: Boolean,
       addedToCallTime: Long,
@@ -144,6 +148,7 @@ data class CallParticipant constructor(
         isForwardingVideo = isForwardingVideo,
         isVideoEnabled = videoEnabled,
         isMicrophoneEnabled = audioEnabled,
+        isHandRaised = isHandRaised,
         lastSpoke = lastSpoke,
         isMediaKeysReceived = mediaKeysReceived,
         addedToCallTime = addedToCallTime,

app/src/main/java/org/thoughtcrime/securesms/events/GroupCallRaiseHandEvent.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2023 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.events
+
+import org.thoughtcrime.securesms.recipients.Recipient
+import java.util.concurrent.TimeUnit
+
+data class GroupCallRaiseHandEvent(val sender: Recipient, val timestamp: Long) {
+  fun getCollapseTimestamp(): Long {
+    return timestamp + TimeUnit.SECONDS.toMillis(LIFESPAN_SECONDS)
+  }
+
+  companion object {
+    const val LIFESPAN_SECONDS = 4L
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/events/WebRtcViewModel.kt

@@ -92,6 +92,7 @@ class WebRtcViewModel(state: WebRtcServiceState) {
   val isRemoteVideoOffer: Boolean = state.getCallSetupState(state.callInfoState.activePeer?.callId).isRemoteVideoOffer
   val callConnectedTime: Long = state.callInfoState.callConnectedTime
   val remoteParticipants: List<CallParticipant> = state.callInfoState.remoteCallParticipants
+  val raisedHands: List<GroupCallRaiseHandEvent> = state.callInfoState.raisedHands
   val identityChangedParticipants: Set<RecipientId> = state.callInfoState.identityChangedRecipients
   val remoteDevicesCount: OptionalLong = state.callInfoState.remoteDevicesCount
   val participantLimit: Long? = state.callInfoState.participantLimit
@@ -109,7 +110,8 @@ class WebRtcViewModel(state: WebRtcServiceState) {
   val localParticipant: CallParticipant = createLocal(
     state.localDeviceState.cameraState,
     (if (state.videoState.localSink != null) state.videoState.localSink else BroadcastVideoSink())!!,
-    state.localDeviceState.isMicrophoneEnabled
+    state.localDeviceState.isMicrophoneEnabled,
+    state.callInfoState.raisedHands.map { it.sender }.contains(Recipient.self())
   )
 
   val isCellularConnection: Boolean = when (state.localDeviceState.networkConnectionType) {