recycler: add span size abstraction to adapter

Make adapter instances handle span sizes.

This supercedes the hackier solution where the fragments would have to
reference adapter data in order to determine span size. Not anymore.

app/src/main/java/org/oxycblt/auxio/detail/AlbumDetailFragment.kt

@@ -41,7 +41,6 @@ import org.oxycblt.auxio.playback.state.PlaybackMode
 import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.ui.Sort
 import org.oxycblt.auxio.ui.fragment.MenuFragment
-import org.oxycblt.auxio.ui.recycler.Header
 import org.oxycblt.auxio.ui.recycler.Item
 import org.oxycblt.auxio.util.canScroll
 import org.oxycblt.auxio.util.collect
@@ -84,13 +83,7 @@ class AlbumDetailFragment :
             setOnMenuItemClickListener(this@AlbumDetailFragment)
         }
 
-        binding.detailRecycler.apply {
+        binding.detailRecycler.adapter = detailAdapter
-            adapter = detailAdapter
-            setSpanSizeLookup { pos ->
-                val item = detailAdapter.currentList[pos]
-                item is Album || item is Header || item is SortHeader
-            }
-        }
 
         // -- VIEWMODEL SETUP ---
 

app/src/main/java/org/oxycblt/auxio/detail/ArtistDetailFragment.kt

@@ -39,7 +39,6 @@ import org.oxycblt.auxio.playback.state.PlaybackMode
 import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.ui.Sort
 import org.oxycblt.auxio.ui.fragment.MenuFragment
-import org.oxycblt.auxio.ui.recycler.Header
 import org.oxycblt.auxio.ui.recycler.Item
 import org.oxycblt.auxio.util.collect
 import org.oxycblt.auxio.util.collectImmediately
@@ -79,13 +78,7 @@ class ArtistDetailFragment :
             setOnMenuItemClickListener(this@ArtistDetailFragment)
         }
 
-        binding.detailRecycler.apply {
+        binding.detailRecycler.adapter = detailAdapter
-            adapter = detailAdapter
-            setSpanSizeLookup { pos ->
-                val item = detailAdapter.currentList[pos]
-                item is Artist || item is Header || item is SortHeader
-            }
-        }
 
         // --- VIEWMODEL SETUP ---
 

app/src/main/java/org/oxycblt/auxio/detail/GenreDetailFragment.kt

@@ -40,7 +40,6 @@ import org.oxycblt.auxio.playback.state.PlaybackMode
 import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.ui.Sort
 import org.oxycblt.auxio.ui.fragment.MenuFragment
-import org.oxycblt.auxio.ui.recycler.Header
 import org.oxycblt.auxio.ui.recycler.Item
 import org.oxycblt.auxio.util.collect
 import org.oxycblt.auxio.util.collectImmediately
@@ -80,13 +79,7 @@ class GenreDetailFragment :
             setOnMenuItemClickListener(this@GenreDetailFragment)
         }
 
-        binding.detailRecycler.apply {
+        binding.detailRecycler.adapter = detailAdapter
-            adapter = detailAdapter
-            setSpanSizeLookup { pos ->
-                val item = detailAdapter.currentList[pos]
-                item is Genre || item is Header || item is SortHeader
-            }
-        }
 
         // --- VIEWMODEL SETUP ---
 

app/src/main/java/org/oxycblt/auxio/detail/recycler/AlbumDetailAdapter.kt

@@ -77,6 +77,11 @@ class AlbumDetailAdapter(private val listener: Listener) :
         }
     }
 
+    override fun isItemFullWidth(position: Int): Boolean {
+        val item = differ.currentList[position]
+        return super.isItemFullWidth(position) || item is Album || item is DiscHeader
+    }
+
     companion object {
         private val DIFFER =
             object : SimpleItemCallback<Item>() {

app/src/main/java/org/oxycblt/auxio/detail/recycler/ArtistDetailAdapter.kt

@@ -78,6 +78,11 @@ class ArtistDetailAdapter(private val listener: Listener) :
         }
     }
 
+    override fun isItemFullWidth(position: Int): Boolean {
+        val item = differ.currentList[position]
+        return super.isItemFullWidth(position) || item is Artist
+    }
+
     companion object {
         private val DIFFER =
             object : SimpleItemCallback<Item>() {

app/src/main/java/org/oxycblt/auxio/detail/recycler/DetailAdapter.kt

@@ -26,6 +26,7 @@ import androidx.recyclerview.widget.RecyclerView
 import org.oxycblt.auxio.IntegerTable
 import org.oxycblt.auxio.databinding.ItemSortHeaderBinding
 import org.oxycblt.auxio.detail.SortHeader
+import org.oxycblt.auxio.ui.recycler.AuxioRecyclerView
 import org.oxycblt.auxio.ui.recycler.Header
 import org.oxycblt.auxio.ui.recycler.HeaderViewHolder
 import org.oxycblt.auxio.ui.recycler.IndicatorAdapter
@@ -38,7 +39,7 @@ import org.oxycblt.auxio.util.inflater
 abstract class DetailAdapter<L : DetailAdapter.Listener>(
     private val listener: L,
     diffCallback: DiffUtil.ItemCallback<Item>
-) : IndicatorAdapter<RecyclerView.ViewHolder>() {
+) : IndicatorAdapter<RecyclerView.ViewHolder>(), AuxioRecyclerView.SpanSizeLookup {
     private var isPlaying = false
 
     @Suppress("LeakingThis") override fun getItemCount() = differ.currentList.size
@@ -77,6 +78,11 @@ abstract class DetailAdapter<L : DetailAdapter.Listener>(
         super.onBindViewHolder(holder, position, payloads)
     }
 
+    override fun isItemFullWidth(position: Int): Boolean {
+        val item = differ.currentList[position]
+        return item is Header || item is SortHeader
+    }
+
     protected val differ = AsyncListDiffer(this, diffCallback)
 
     override val currentList: List<Item>

app/src/main/java/org/oxycblt/auxio/detail/recycler/GenreDetailAdapter.kt

@@ -71,6 +71,11 @@ class GenreDetailAdapter(private val listener: Listener) :
         }
     }
 
+    override fun isItemFullWidth(position: Int): Boolean {
+        val item = differ.currentList[position]
+        return super.isItemFullWidth(position) || item is Genre
+    }
+
     companion object {
         val DIFFER =
             object : SimpleItemCallback<Item>() {

app/src/main/java/org/oxycblt/auxio/image/IndicatorView.kt

@@ -33,9 +33,9 @@ import org.oxycblt.auxio.util.getColorCompat
 import org.oxycblt.auxio.util.getDrawableCompat
 
 /**
- * View that displays the playback indicator. Nominally emulates [StyledImageView], but is
+ * View that displays the playback indicator. Nominally emulates [StyledImageView], but is much
- * much different internally as an animated icon can't be wrapped within StyledDrawable without
+ * different internally as an animated icon can't be wrapped within StyledDrawable without causing
- * causing insane issues.
+ * insane issues.
  * @author OxygenCobalt
  */
 class IndicatorView
@@ -45,7 +45,8 @@ constructor(context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr
     private val playingIndicatorDrawable =
         context.getDrawableCompat(R.drawable.ic_playing_indicator_24) as AnimationDrawable
 
-    private val pausedIndicatorDrawable = context.getDrawableCompat(R.drawable.ic_paused_indicator_24)
+    private val pausedIndicatorDrawable =
+        context.getDrawableCompat(R.drawable.ic_paused_indicator_24)
 
     private val indicatorMatrix = Matrix()
     private val indicatorMatrixSrc = RectF()

app/src/main/java/org/oxycblt/auxio/search/SearchAdapter.kt

@@ -26,6 +26,7 @@ import org.oxycblt.auxio.music.Genre
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.ui.recycler.AlbumViewHolder
 import org.oxycblt.auxio.ui.recycler.ArtistViewHolder
+import org.oxycblt.auxio.ui.recycler.AuxioRecyclerView
 import org.oxycblt.auxio.ui.recycler.GenreViewHolder
 import org.oxycblt.auxio.ui.recycler.Header
 import org.oxycblt.auxio.ui.recycler.HeaderViewHolder
@@ -36,7 +37,7 @@ import org.oxycblt.auxio.ui.recycler.SimpleItemCallback
 import org.oxycblt.auxio.ui.recycler.SongViewHolder
 
 class SearchAdapter(private val listener: MenuItemListener) :
-    IndicatorAdapter<RecyclerView.ViewHolder>() {
+    IndicatorAdapter<RecyclerView.ViewHolder>(), AuxioRecyclerView.SpanSizeLookup {
     private val differ = AsyncListDiffer(this, DIFFER)
 
     override fun getItemCount() = differ.currentList.size
@@ -79,6 +80,8 @@ class SearchAdapter(private val listener: MenuItemListener) :
         }
     }
 
+    override fun isItemFullWidth(position: Int) = differ.currentList[position] is Header
+
     override val currentList: List<Item>
         get() = differ.currentList
 

app/src/main/java/org/oxycblt/auxio/search/SearchFragment.kt

@@ -39,7 +39,6 @@ import org.oxycblt.auxio.music.MusicParent
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.ui.fragment.MenuFragment
-import org.oxycblt.auxio.ui.recycler.Header
 import org.oxycblt.auxio.ui.recycler.Item
 import org.oxycblt.auxio.ui.recycler.MenuItemListener
 import org.oxycblt.auxio.util.androidViewModels
@@ -104,10 +103,7 @@ class SearchFragment :
             }
         }
 
-        binding.searchRecycler.apply {
+        binding.searchRecycler.adapter = searchAdapter
-            adapter = searchAdapter
-            setSpanSizeLookup { pos -> searchAdapter.currentList[pos] is Header }
-        }
 
         // --- VIEWMODEL SETUP ---
 

app/src/main/java/org/oxycblt/auxio/ui/recycler/AuxioRecyclerView.kt

@@ -54,13 +54,20 @@ constructor(context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr
         return insets
     }
 
-    // TODO: Move abstraction to adapters since using external data will not work well
+    override fun setAdapter(adapter: Adapter<*>?) {
-    inline fun setSpanSizeLookup(crossinline fullWidth: (Int) -> Boolean) {
+        super.setAdapter(adapter)
-        val glm = layoutManager as GridLayoutManager
+
-        val spanCount = glm.spanCount
+        if (adapter is SpanSizeLookup) {
+            val glm = (layoutManager as GridLayoutManager)
             glm.spanSizeLookup =
                 object : GridLayoutManager.SpanSizeLookup() {
-                override fun getSpanSize(position: Int) = if (fullWidth(position)) spanCount else 1
+                    override fun getSpanSize(position: Int) =
+                        if (adapter.isItemFullWidth(position)) glm.spanCount else 1
                 }
         }
     }
+
+    interface SpanSizeLookup {
+        fun isItemFullWidth(position: Int): Boolean
+    }
+}