search: add playing indicators [#218]

Add playing indicators to the search view too.

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

@@ -87,7 +87,7 @@ class AlbumDetailFragment :
         binding.detailRecycler.apply {
             adapter = detailAdapter
             setSpanSizeLookup { pos ->
-                val item = detailModel.albumData.value[pos]
+                val item = detailAdapter.currentList[pos]
                 item is Album || item is Header || item is SortHeader
             }
         }

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

@@ -82,7 +82,7 @@ class ArtistDetailFragment :
         binding.detailRecycler.apply {
             adapter = detailAdapter
             setSpanSizeLookup { pos ->
-                val item = detailModel.artistData.value[pos]
+                val item = detailAdapter.currentList[pos]
                 item is Artist || item is Header || item is SortHeader
             }
         }

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

@@ -83,7 +83,7 @@ class GenreDetailFragment :
         binding.detailRecycler.apply {
             adapter = detailAdapter
             setSpanSizeLookup { pos ->
-                val item = detailModel.genreData.value[pos]
+                val item = detailAdapter.currentList[pos]
                 item is Genre || item is Header || item is SortHeader
             }
         }

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

@@ -77,6 +77,9 @@ abstract class DetailAdapter<L : DetailAdapter.Listener>(
 
     protected val differ = AsyncListDiffer(this, diffCallback)
 
+    val currentList: List<Item>
+        get() = differ.currentList
+
     fun submitList(list: List<Item>) {
         differ.submitList(list)
     }

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

@@ -24,6 +24,7 @@ import org.oxycblt.auxio.music.Album
 import org.oxycblt.auxio.music.Artist
 import org.oxycblt.auxio.music.Genre
 import org.oxycblt.auxio.music.Song
+import org.oxycblt.auxio.ui.recycler.ActivationAdapter
 import org.oxycblt.auxio.ui.recycler.AlbumViewHolder
 import org.oxycblt.auxio.ui.recycler.ArtistViewHolder
 import org.oxycblt.auxio.ui.recycler.GenreViewHolder
@@ -35,8 +36,12 @@ import org.oxycblt.auxio.ui.recycler.SimpleItemCallback
 import org.oxycblt.auxio.ui.recycler.SongViewHolder
 
 class SearchAdapter(private val listener: MenuItemListener) :
-    RecyclerView.Adapter<RecyclerView.ViewHolder>() {
+    ActivationAdapter<RecyclerView.ViewHolder>() {
     private val differ = AsyncListDiffer(this, DIFFER)
+    private var currentSong: Song? = null
+    private var currentAlbum: Album? = null
+    private var currentArtist: Artist? = null
+    private var currentGenre: Genre? = null
 
     override fun getItemCount() = differ.currentList.size
 
@@ -45,7 +50,7 @@ class SearchAdapter(private val listener: MenuItemListener) :
             is Song -> SongViewHolder.VIEW_TYPE
             is Album -> AlbumViewHolder.VIEW_TYPE
             is Artist -> ArtistViewHolder.VIEW_TYPE
-            is Genre -> HeaderViewHolder.VIEW_TYPE
+            is Genre -> GenreViewHolder.VIEW_TYPE
             is Header -> HeaderViewHolder.VIEW_TYPE
             else -> super.getItemViewType(position)
         }
@@ -60,7 +65,14 @@ class SearchAdapter(private val listener: MenuItemListener) :
             else -> error("Invalid item type $viewType")
         }
 
-    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
+    override fun onBindViewHolder(
+        holder: RecyclerView.ViewHolder,
+        position: Int,
+        payloads: List<Any>
+    ) {
+        super.onBindViewHolder(holder, position, payloads)
+
+        if (payloads.isEmpty()) {
             when (val item = differ.currentList[position]) {
                 is Song -> (holder as SongViewHolder).bind(item, listener)
                 is Album -> (holder as AlbumViewHolder).bind(item, listener)
@@ -69,9 +81,46 @@ class SearchAdapter(private val listener: MenuItemListener) :
                 is Header -> (holder as HeaderViewHolder).bind(item)
             }
         }
+    }
+
+    override fun shouldActivateViewHolder(position: Int): Boolean {
+        val item = differ.currentList[position]
+
+        return (item is Song && item.id == currentSong?.id) ||
+            (item is Album && item.id == currentAlbum?.id) ||
+            (item is Artist && item.id == currentArtist?.id) ||
+            (item is Genre && item.id == currentGenre?.id)
+    }
+
+    val currentList: List<Item>
+        get() = differ.currentList
 
     fun submitList(list: List<Item>, callback: () -> Unit) = differ.submitList(list, callback)
 
+    fun activateSong(song: Song?) {
+        if (song == currentSong) return
+        activateImpl(differ.currentList, currentSong, song)
+        currentSong = song
+    }
+
+    fun activateAlbum(album: Album?) {
+        if (album == currentAlbum) return
+        activateImpl(differ.currentList, currentAlbum, album)
+        currentAlbum = album
+    }
+
+    fun activateArtist(artist: Artist?) {
+        if (artist == currentArtist) return
+        activateImpl(differ.currentList, currentArtist, artist)
+        currentArtist = artist
+    }
+
+    fun activateGenre(genre: Genre?) {
+        if (genre == currentGenre) return
+        activateImpl(differ.currentList, currentGenre, genre)
+        currentGenre = genre
+    }
+
     companion object {
         private val DIFFER =
             object : SimpleItemCallback<Item>() {

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

@@ -106,12 +106,13 @@ class SearchFragment :
 
         binding.searchRecycler.apply {
             adapter = searchAdapter
-            setSpanSizeLookup { pos -> searchModel.searchResults.value[pos] is Header }
+            setSpanSizeLookup { pos -> searchAdapter.currentList[pos] is Header }
         }
 
         // --- VIEWMODEL SETUP ---
 
-        collectImmediately(searchModel.searchResults, ::updateResults)
+        collectImmediately(searchModel.searchResults, ::handleResults)
+        collectImmediately(playbackModel.song, playbackModel.parent, ::handlePlayback)
         collect(navModel.exploreNavigationItem, ::handleNavigation)
     }
 
@@ -151,7 +152,7 @@ class SearchFragment :
         }
     }
 
-    private fun updateResults(results: List<Item>) {
+    private fun handleResults(results: List<Item>) {
         val binding = requireBinding()
 
         searchAdapter.submitList(results.toMutableList()) {
@@ -164,6 +165,36 @@ class SearchFragment :
         binding.searchRecycler.isInvisible = results.isEmpty()
     }
 
+    private fun handlePlayback(song: Song?, parent: MusicParent?) {
+        if (parent == null) {
+            searchAdapter.activateSong(song)
+        } else {
+            // Ignore playback not from all songs
+            searchAdapter.activateSong(null)
+        }
+
+        if (parent is Album) {
+            searchAdapter.activateAlbum(parent)
+        } else {
+            // Ignore playback not from albums
+            searchAdapter.activateAlbum(null)
+        }
+
+        if (parent is Artist) {
+            searchAdapter.activateArtist(parent)
+        } else {
+            // Ignore playback not from artists
+            searchAdapter.activateArtist(null)
+        }
+
+        if (parent is Genre) {
+            searchAdapter.activateGenre(parent)
+        } else {
+            // Ignore playback not from artists
+            searchAdapter.activateGenre(null)
+        }
+    }
+
     private fun handleNavigation(item: Music?) {
         findNavController()
             .navigate(

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

@@ -54,6 +54,7 @@ constructor(context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr
         return insets
     }
 
+    // TODO: Move abstraction to adapters since using external data will not work well
     inline fun setSpanSizeLookup(crossinline fullWidth: (Int) -> Boolean) {
         val glm = layoutManager as GridLayoutManager
         val spanCount = glm.spanCount