Add polish to story crossfader when exiting viewer.

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/StoryViewerFragment.kt

@@ -145,6 +145,11 @@ class StoryViewerFragment :
     viewModel.addHiddenAndRefresh(setOf(recipientId))
   }
 
+  override fun onContentTranslation(x: Float, y: Float) {
+    storyCrossfader.translationX = x
+    storyCrossfader.translationY = y
+  }
+
   override fun onReadyToAnimate() {
   }
 

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/page/StoryViewerPageFragment.kt

@@ -214,6 +214,7 @@ class StoryViewerPageFragment :
         viewModel::goToNextPost,
         viewModel::goToPreviousPost,
         this::startReply,
+        requireListener<Callback>()::onContentTranslation,
         sharedViewModel = sharedViewModel
       )
     )
@@ -252,6 +253,8 @@ class StoryViewerPageFragment :
             .setDuration(100)
             .translationX(0f)
             .translationY(0f)
+
+          requireListener<Callback>().onContentTranslation(0f, 0f)
         }
       }
 
@@ -1144,6 +1147,7 @@ class StoryViewerPageFragment :
     private val onGoToNext: () -> Unit,
     private val onGoToPrevious: () -> Unit,
     private val onReplyToPost: () -> Unit,
+    private val onContentTranslation: (Float, Float) -> Unit,
     private val viewToTranslate: View = container.parent as View,
     private val sharedViewModel: StoryViewerViewModel
   ) : GestureDetector.SimpleOnGestureListener() {
@@ -1194,6 +1198,8 @@ class StoryViewerPageFragment :
       viewToTranslate.animate().cancel()
       viewToTranslate.translationX = distance
 
+      onContentTranslation(viewToTranslate.translationX, viewToTranslate.translationY)
+
       return true
     }
 
@@ -1303,12 +1309,6 @@ class StoryViewerPageFragment :
     sharedViewModel.setContentIsReady()
   }
 
-  interface Callback {
-    fun onGoToPreviousStory(recipientId: RecipientId)
-    fun onFinishedPosts(recipientId: RecipientId)
-    fun onStoryHidden(recipientId: RecipientId)
-  }
-
   override fun userHasSeenFirstNavigationView(): Boolean {
     return SignalStore.storyValues().userHasSeenFirstNavView
   }
@@ -1333,4 +1333,11 @@ class StoryViewerPageFragment :
   override fun onCanceled() {
     viewModel.setIsDisplayingPartialSendDialog(false)
   }
+
+  interface Callback {
+    fun onGoToPreviousStory(recipientId: RecipientId)
+    fun onFinishedPosts(recipientId: RecipientId)
+    fun onStoryHidden(recipientId: RecipientId)
+    fun onContentTranslation(x: Float, y: Float)
+  }
 }