Revert "Make controllers responsible for showing/hiding FAB"

This reverts commit 8ef548032f.

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt

@@ -68,7 +68,6 @@ import eu.kanade.tachiyomi.util.view.shrinkOnScroll
 import eu.kanade.tachiyomi.util.view.snack
 import eu.kanade.tachiyomi.util.view.visible
 import kotlinx.android.synthetic.main.main_activity.root_coordinator
-import kotlinx.android.synthetic.main.main_activity.root_fab
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import reactivecircus.flowbinding.android.view.clicks
@@ -128,6 +127,7 @@ class MangaController :
      */
     private var settingsSheet: ChaptersSettingsSheet? = null
 
+    private var actionFab: ExtendedFloatingActionButton? = null
     private var actionFabScrollListener: RecyclerView.OnScrollListener? = null
 
     /**
@@ -191,8 +191,7 @@ class MangaController :
         binding.recycler.setHasFixedSize(true)
         chaptersAdapter?.fastScroller = binding.fastScroller
 
-        activity!!.root_fab.visible()
-        actionFabScrollListener = activity!!.root_fab.shrinkOnScroll(binding.recycler)
+        actionFabScrollListener = actionFab?.shrinkOnScroll(binding.recycler)
 
         // Skips directly to chapters list if navigated to from the library
         binding.recycler.post {
@@ -225,6 +224,7 @@ class MangaController :
     }
 
     override fun configureFab(fab: ExtendedFloatingActionButton) {
+        actionFab = fab
         fab.setText(R.string.action_start)
         fab.setIconResource(R.drawable.ic_play_arrow_24dp)
         fab.clicks()
@@ -239,14 +239,15 @@ class MangaController :
                     }
 
                     // Get coordinates and start animation
-                    val coordinates = fab.getCoordinates()
-                    if (!binding.revealView.showRevealEffect(
-                        coordinates.x,
-                        coordinates.y,
-                        revealAnimationListener
-                    )
-                    ) {
-                        openChapter(item.chapter)
+                    actionFab?.getCoordinates()?.let { coordinates ->
+                        if (!binding.revealView.showRevealEffect(
+                            coordinates.x,
+                            coordinates.y,
+                            revealAnimationListener
+                        )
+                        ) {
+                            openChapter(item.chapter)
+                        }
                     }
                 } else {
                     view?.context?.toast(R.string.no_next_chapter)
@@ -257,12 +258,12 @@ class MangaController :
 
     override fun cleanupFab(fab: ExtendedFloatingActionButton) {
         actionFabScrollListener?.let { binding.recycler.removeOnScrollListener(it) }
+        actionFab = null
     }
 
     override fun onDestroyView(view: View) {
         destroyActionModeIfNeeded()
         binding.actionToolbar.destroy()
-        activity!!.root_fab.gone()
         mangaInfoAdapter = null
         chaptersHeaderAdapter = null
         chaptersAdapter = null
@@ -276,8 +277,9 @@ class MangaController :
         // Check if animation view is visible
         if (binding.revealView.visibility == View.VISIBLE) {
             // Show the unreveal effect
-            val coordinates = activity.root_fab.getCoordinates()
-            binding.revealView.hideRevealEffect(coordinates.x, coordinates.y, 1920)
+            actionFab?.getCoordinates()?.let { coordinates ->
+                binding.revealView.hideRevealEffect(coordinates.x, coordinates.y, 1920)
+            }
         }
 
         super.onActivityResumed(activity)
@@ -619,7 +621,7 @@ class MangaController :
 
         val context = view?.context
         if (context != null && chapters.any { it.read }) {
-            activity!!.root_fab.text = context.getString(R.string.action_resume)
+            actionFab?.text = context.getString(R.string.action_resume)
         }
     }
 
@@ -759,8 +761,8 @@ class MangaController :
             binding.actionToolbar.findItem(R.id.action_mark_as_unread)?.isVisible = chapters.all { it.chapter.read }
 
             // Hide FAB to avoid interfering with the bottom action toolbar
-            // activity!!.root_fab.hide()
-            activity!!.root_fab.gone()
+            // actionFab?.hide()
+            actionFab?.gone()
         }
         return false
     }
@@ -794,8 +796,8 @@ class MangaController :
 
         // TODO: there seems to be a bug in MaterialComponents where the [ExtendedFloatingActionButton]
         // fails to show up properly
-        // activity!!.root_fab.show()
-        activity!!.root_fab.visible()
+        // actionFab?.show()
+        actionFab?.visible()
     }
 
     override fun onDetach(view: View) {