detail: add framework for disc number items

Add the UI and data components for a disc number value within the album
detail view.

This is the first-step of a multi-step addition to finally implement
disc numbers.

app/src/main/java/org/oxycblt/auxio/IntegerTable.kt

@@ -46,9 +46,11 @@ object IntegerTable {
     const val ITEM_TYPE_GENRE_DETAIL = 0xA00B
     /** GenreSongViewHolder */
     const val ITEM_TYPE_GENRE_SONG = 0xA00C
+    /** DiscHeaderViewHolder */
+    const val ITEM_TYPE_DISC_HEADER = 0xA00D
 
     /** QueueSongViewHolder */
-    const val ITEM_TYPE_QUEUE_SONG = 0xA00D
+    const val ITEM_TYPE_QUEUE_SONG = 0xA00E
 
     /** "Music playback" Notification code */
     const val NOTIFICATION_CODE = 0xA0A0

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

@@ -21,6 +21,7 @@ import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import org.oxycblt.auxio.R
+import org.oxycblt.auxio.detail.recycler.DiscHeader
 import org.oxycblt.auxio.detail.recycler.SortHeader
 import org.oxycblt.auxio.music.Album
 import org.oxycblt.auxio.music.Artist
@@ -137,7 +138,7 @@ class DetailViewModel : ViewModel() {
         logD("Refreshing album data")
         val data = mutableListOf<Item>(album)
         data.add(SortHeader(id = -2, R.string.lbl_songs))
-        data.addAll(albumSort.album(album))
+        data.add(DiscHeader(id = -3, 1))
         _albumData.value = data
     }
 }

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

@@ -25,6 +25,7 @@ import org.oxycblt.auxio.R
 import org.oxycblt.auxio.coil.bindAlbumCover
 import org.oxycblt.auxio.databinding.ItemAlbumSongBinding
 import org.oxycblt.auxio.databinding.ItemDetailBinding
+import org.oxycblt.auxio.databinding.ItemDiscHeaderBinding
 import org.oxycblt.auxio.music.Album
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.ui.BindingViewHolder
@@ -50,6 +51,7 @@ class AlbumDetailAdapter(listener: Listener) :
         super.getCreatorFromItem(item)
             ?: when (item) {
                 is Album -> AlbumDetailViewHolder.CREATOR
+                is DiscHeader -> DiscHeaderViewHolder.CREATOR
                 is Song -> AlbumSongViewHolder.CREATOR
                 else -> null
             }
@@ -58,6 +60,7 @@ class AlbumDetailAdapter(listener: Listener) :
         super.getCreatorFromViewType(viewType)
             ?: when (viewType) {
                 AlbumDetailViewHolder.CREATOR.viewType -> AlbumDetailViewHolder.CREATOR
+                DiscHeaderViewHolder.CREATOR.viewType -> DiscHeaderViewHolder.CREATOR
                 AlbumSongViewHolder.CREATOR.viewType -> AlbumSongViewHolder.CREATOR
                 else -> null
             }
@@ -67,6 +70,7 @@ class AlbumDetailAdapter(listener: Listener) :
 
         when (item) {
             is Album -> (viewHolder as AlbumDetailViewHolder).bind(item, listener)
+            is DiscHeader -> (viewHolder as DiscHeaderViewHolder).bind(item, Unit)
             is Song -> (viewHolder as AlbumSongViewHolder).bind(item, listener)
         }
     }
@@ -100,8 +104,8 @@ class AlbumDetailAdapter(listener: Listener) :
                     return when {
                         oldItem is Album && newItem is Album ->
                             AlbumDetailViewHolder.DIFFER.areItemsTheSame(oldItem, newItem)
-                        oldItem is SortHeader && newItem is SortHeader ->
-                            SortHeaderViewHolder.DIFFER.areItemsTheSame(oldItem, newItem)
+                        oldItem is DiscHeader && newItem is DiscHeader ->
+                            DiscHeaderViewHolder.DIFFER.areItemsTheSame(oldItem, newItem)
                         oldItem is Song && newItem is Song ->
                             AlbumSongViewHolder.DIFFER.areItemsTheSame(oldItem, newItem)
                         else -> DetailAdapter.DIFFER.areItemsTheSame(oldItem, newItem)
@@ -162,6 +166,32 @@ private class AlbumDetailViewHolder private constructor(private val binding: Ite
     }
 }
 
+data class DiscHeader(override val id: Long, val disc: Int) : Item()
+
+class DiscHeaderViewHolder(private val binding: ItemDiscHeaderBinding) :
+    BindingViewHolder<DiscHeader, Unit>(binding.root) {
+    override fun bind(item: DiscHeader, listener: Unit) {
+        binding.discNo.textSafe = "Disc 1"
+    }
+
+    companion object {
+        val CREATOR =
+            object : Creator<DiscHeaderViewHolder> {
+                override val viewType: Int
+                    get() = IntegerTable.ITEM_TYPE_DISC_HEADER
+
+                override fun create(context: Context) =
+                    DiscHeaderViewHolder(ItemDiscHeaderBinding.inflate(context.inflater))
+            }
+
+        val DIFFER =
+            object : SimpleItemCallback<DiscHeader>() {
+                override fun areItemsTheSame(oldItem: DiscHeader, newItem: DiscHeader) =
+                    oldItem.disc == newItem.disc
+            }
+    }
+}
+
 private class AlbumSongViewHolder private constructor(private val binding: ItemAlbumSongBinding) :
     BindingViewHolder<Song, MenuItemListener>(binding.root), Highlightable {
     override fun bind(item: Song, listener: MenuItemListener) {

app/src/main/java/org/oxycblt/auxio/playback/system/MediaSessionComponent.kt

@@ -224,7 +224,7 @@ class MediaSessionComponent(private val context: Context, private val player: Pl
         // Position updates arrive faster when you upload a state that is different, as it
         // forces the system to re-poll the position.
         // FIXME: For some reason however, positions just DON'T UPDATE AT ALL when you
-        //  change from FROM THE APP ONLY WHEN THE PLAYER IS PAUSED. AAAAAAAAAAAAAAAAAAAAAAAAAA
+        //  change from FROM THE APP ONLY WHEN THE PLAYER IS PAUSED.
         val state =
             PlaybackStateCompat.Builder()
                 .setActions(ACTIONS)

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

@@ -0,0 +1,31 @@
+<?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"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:padding="@dimen/spacing_medium"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <org.oxycblt.auxio.coil.StyledImageView
+        android:id="@+id/disc_item"
+        style="@style/Widget.Auxio.Image.Small"
+        android:layout_width="@dimen/size_cover_compact"
+        android:scaleType="center"
+        android:src="@drawable/ic_album"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:ignore="ContentDescription" />
+
+    <TextView
+        android:id="@+id/disc_no"
+        style="@style/Widget.Auxio.TextView.Header"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/disc_item"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="Disc 16" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>