Do not allow users to attempt to send story replies to an inactive group.

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/reply/group/StoryGroupReplyFragment.kt

@@ -16,7 +16,6 @@ import com.google.android.material.bottomsheet.BottomSheetBehaviorHack
 import com.google.android.material.bottomsheet.BottomSheetDialog
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
-import io.reactivex.rxjava3.kotlin.plusAssign
 import io.reactivex.rxjava3.kotlin.subscribeBy
 import org.signal.core.util.concurrent.SignalExecutors
 import org.signal.core.util.logging.Log
@@ -146,6 +145,7 @@ class StoryGroupReplyFragment :
   private lateinit var adapter: PagingMappingAdapter<MessageId>
   private lateinit var dataObserver: RecyclerView.AdapterDataObserver
   private lateinit var composer: StoryReplyComposer
+  private lateinit var notInGroup: View
 
   private var markReadHelper: MarkReadHelper? = null
 
@@ -164,6 +164,7 @@ class StoryGroupReplyFragment :
 
     recyclerView = view.findViewById(R.id.recycler)
     composer = view.findViewById(R.id.composer)
+    notInGroup = view.findViewById(R.id.not_in_group)
 
     lifecycleDisposable.bindTo(viewLifecycleOwner)
 
@@ -215,10 +216,7 @@ class StoryGroupReplyFragment :
     adapter.registerAdapterDataObserver(dataObserver)
 
     initializeMentions()
-
-    if (savedInstanceState == null) {
-      ViewUtil.focusAndShowKeyboard(composer)
-    }
+    initializeComposer(savedInstanceState)
 
     recyclerView.addOnScrollListener(GroupReplyScrollObserver())
   }
@@ -433,6 +431,22 @@ class StoryGroupReplyFragment :
     sendReaction(emoji)
   }
 
+  private fun initializeComposer(savedInstanceState: Bundle?) {
+    val isActiveGroup = Recipient.observable(groupRecipientId).map { it.isActiveGroup }
+    if (savedInstanceState == null) {
+      lifecycleDisposable += isActiveGroup.firstOrError().observeOn(AndroidSchedulers.mainThread()).subscribe { active ->
+        if (active) {
+          ViewUtil.focusAndShowKeyboard(composer)
+        }
+      }
+    }
+
+    lifecycleDisposable += isActiveGroup.distinctUntilChanged().observeOn(AndroidSchedulers.mainThread()).forEach { active ->
+      composer.visible = active
+      notInGroup.visible = !active
+    }
+  }
+
   private fun initializeMentions() {
     inlineQueryResultsController = InlineQueryResultsController(
       requireContext(),

app/src/main/res/layout/stories_group_replies_fragment.xml

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    tools:viewBindingIgnore="true"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:layout_gravity="bottom">
+    tools:layout_gravity="bottom"
+    tools:viewBindingIgnore="true">
 
     <TextView
         android:id="@+id/empty_notice"
@@ -25,7 +25,7 @@
         android:orientation="vertical"
         android:scrollbars="vertical"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintBottom_toTopOf="@+id/composer"
+        app:layout_constraintBottom_toTopOf="@+id/bottom_bar"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
@@ -36,16 +36,36 @@
         android:id="@+id/mentions_picker_container"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        app:layout_constraintBottom_toTopOf="@+id/composer"
+        app:layout_constraintBottom_toTopOf="@+id/bottom_bar"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintVertical_bias="1" />
 
-    <org.thoughtcrime.securesms.stories.viewer.reply.composer.StoryReplyComposer
-        android:id="@+id/composer"
+    <FrameLayout
+        android:id="@+id/bottom_bar"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        app:layout_constraintBottom_toBottomOf="parent" />
+        app:layout_constraintBottom_toBottomOf="parent">
+
+        <TextView
+            android:id="@+id/not_in_group"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:layout_marginHorizontal="@dimen/dsl_settings_gutter"
+            android:layout_marginTop="16dp"
+            android:layout_marginBottom="16dp"
+            android:gravity="center"
+            android:minHeight="48dp"
+            android:text="@string/StoryGroupReplyFragment__you_cant_reply"
+            android:textAppearance="@style/Signal.Text.BodyMedium"
+            android:textColor="@color/signal_colorOnSurfaceVariant"
+            android:visibility="gone" />
+
+        <org.thoughtcrime.securesms.stories.viewer.reply.composer.StoryReplyComposer
+            android:id="@+id/composer"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+    </FrameLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -4829,6 +4829,8 @@
     <string name="StoryViewItem__remove_viewer">Remove viewer</string>
     <!-- Displayed when a story has no replies yet -->
     <string name="StoryGroupReplyFragment__no_replies_yet">No replies yet</string>
+    <!-- Displayed when no longer a group member -->
+    <string name="StoryGroupReplyFragment__you_cant_reply">You can\'t reply to this story because you\'re no longer a member of this group.</string>
     <!-- Displayed for each user that reacted to a story when viewing replies -->
     <string name="StoryGroupReactionReplyItem__reacted_to_the_story">Reacted to the story</string>
     <!-- Label for story views tab -->