Separate out chapters heading into separate adapter

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

@@ -0,0 +1,47 @@
+package eu.kanade.tachiyomi.ui.manga.chapter
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.databinding.MangaChaptersHeaderBinding
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+
+class MangaChaptersHeaderAdapter :
+    RecyclerView.Adapter<MangaChaptersHeaderAdapter.HeaderViewHolder>() {
+
+    private var numChapters: Int? = null
+
+    private val scope = CoroutineScope(Job() + Dispatchers.Main)
+    private lateinit var binding: MangaChaptersHeaderBinding
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): HeaderViewHolder {
+        binding = MangaChaptersHeaderBinding.inflate(LayoutInflater.from(parent.context), parent, false)
+        return HeaderViewHolder(binding.root)
+    }
+
+    override fun getItemCount(): Int = 1
+
+    override fun onBindViewHolder(holder: HeaderViewHolder, position: Int) {
+        holder.bind()
+    }
+
+    fun setNumChapters(numChapters: Int) {
+        this.numChapters = numChapters
+
+        notifyDataSetChanged()
+    }
+
+    inner class HeaderViewHolder(private val view: View) : RecyclerView.ViewHolder(view) {
+        fun bind() {
+            binding.chaptersLabel.text = if (numChapters == null) {
+                view.context.getString(R.string.chapters)
+            } else {
+                view.context.resources.getQuantityString(R.plurals.manga_num_chapters, numChapters!!, numChapters)
+            }
+        }
+    }
+}

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

@@ -68,7 +68,8 @@ class MangaInfoChaptersController(private val fromSource: Boolean = false) :
 
     private val preferences: PreferencesHelper by injectLazy()
 
-    private var headerAdapter: MangaInfoHeaderAdapter? = null
+    private var mangaInfoAdapter: MangaInfoHeaderAdapter? = null
+    private var chaptersHeaderAdapter: MangaChaptersHeaderAdapter? = null
     private var chaptersAdapter: ChaptersAdapter? = null
 
     /**
@@ -110,10 +111,11 @@ class MangaInfoChaptersController(private val fromSource: Boolean = false) :
         if (ctrl.manga == null || ctrl.source == null) return
 
         // Init RecyclerView and adapter
-        headerAdapter = MangaInfoHeaderAdapter(this, fromSource)
+        mangaInfoAdapter = MangaInfoHeaderAdapter(this, fromSource)
+        chaptersHeaderAdapter = MangaChaptersHeaderAdapter()
         chaptersAdapter = ChaptersAdapter(this, view.context)
 
-        binding.recycler.adapter = MergeAdapter(headerAdapter, chaptersAdapter)
+        binding.recycler.adapter = MergeAdapter(mangaInfoAdapter, chaptersHeaderAdapter, chaptersAdapter)
         binding.recycler.layoutManager = LinearLayoutManager(view.context)
         binding.recycler.addItemDecoration(DividerItemDecoration(view.context, DividerItemDecoration.VERTICAL))
         binding.recycler.setHasFixedSize(true)
@@ -157,7 +159,8 @@ class MangaInfoChaptersController(private val fromSource: Boolean = false) :
     override fun onDestroyView(view: View) {
         destroyActionModeIfNeeded()
         binding.actionToolbar.destroy()
-        headerAdapter = null
+        mangaInfoAdapter = null
+        chaptersHeaderAdapter = null
         chaptersAdapter = null
         super.onDestroyView(view)
     }
@@ -300,7 +303,7 @@ class MangaInfoChaptersController(private val fromSource: Boolean = false) :
     fun onNextMangaInfo(manga: Manga, source: Source) {
         if (manga.initialized) {
             // Update view.
-            headerAdapter?.update(manga, source)
+            mangaInfoAdapter?.update(manga, source)
 
             // Skips directly to chapters list by default if navigated to from the library
             if (!fromSource) {
@@ -419,7 +422,7 @@ class MangaInfoChaptersController(private val fromSource: Boolean = false) :
             }
         }
 
-        headerAdapter?.notifyDataSetChanged()
+        mangaInfoAdapter?.notifyDataSetChanged()
     }
 
     fun onCategoriesClick() {
@@ -511,8 +514,8 @@ class MangaInfoChaptersController(private val fromSource: Boolean = false) :
             fetchChaptersFromSource()
         }
 
-        val header = headerAdapter ?: return
-        header.setNumChapters(chapters.size)
+        val chaptersHeader = chaptersHeaderAdapter ?: return
+        chaptersHeader.setNumChapters(chapters.size)
 
         val adapter = chaptersAdapter ?: return
         adapter.updateDataSet(chapters)

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

@@ -42,7 +42,6 @@ class MangaInfoHeaderAdapter(
 
     private var manga: Manga = controller.presenter.manga
     private var source: Source = controller.presenter.source
-    private var numChapters: Int? = null
 
     private val scope = CoroutineScope(Job() + Dispatchers.Main)
     private lateinit var binding: MangaInfoHeaderBinding
@@ -73,12 +72,6 @@ class MangaInfoHeaderAdapter(
         notifyDataSetChanged()
     }
 
-    fun setNumChapters(numChapters: Int) {
-        this.numChapters = numChapters
-
-        notifyDataSetChanged()
-    }
-
     inner class HeaderViewHolder(private val view: View) : RecyclerView.ViewHolder(view) {
         fun bind() {
             // For rounded corners
@@ -174,7 +167,6 @@ class MangaInfoHeaderAdapter(
                 .launchIn(scope)
 
             setMangaInfo(manga, source)
-            setChapterInfo()
         }
 
         /**
@@ -345,14 +337,5 @@ class MangaInfoHeaderAdapter(
                 isChecked = isFavorite
             }
         }
-
-        private fun setChapterInfo() {
-            // Chapters heading
-            binding.chaptersLabel.text = if (numChapters == null) {
-                view.context.getString(R.string.chapters)
-            } else {
-                view.context.resources.getQuantityString(R.plurals.manga_num_chapters, numChapters!!, numChapters)
-            }
-        }
     }
 }