Add nav to playing song's album

Add the ability to navigate from CompactPlaybackFragment to the album where the current song is.

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

@@ -120,6 +120,8 @@ class AlbumDetailFragment : Fragment() {
             binding.albumArtist.setBackgroundResource(R.drawable.ui_ripple)
         }
 
+        // TODO: Make DetailFragment scroll to song if navigated from CompactPlaybackFragment
+
         Log.d(this::class.simpleName, "Fragment created.")
 
         return binding.root

app/src/main/java/org/oxycblt/auxio/library/LibraryFragment.kt

@@ -162,6 +162,18 @@ class LibraryFragment : Fragment(), SearchView.OnQueryTextListener {
             }
         }
 
+        playbackModel.navToPlayingSong.observe(viewLifecycleOwner) {
+            if (it) {
+                findNavController().navigate(
+                    MainFragmentDirections.actionShowAlbum(
+                        playbackModel.song.value!!.album.id, true
+                    )
+                )
+
+                playbackModel.doneWithNavToPlayingSong()
+            }
+        }
+
         Log.d(this::class.simpleName, "Fragment created.")
 
         return binding.root

app/src/main/java/org/oxycblt/auxio/playback/CompactPlaybackFragment.kt

@@ -42,12 +42,19 @@ class CompactPlaybackFragment : Fragment() {
         binding.song = MusicStore.getInstance().songs[0]
         binding.playbackModel = playbackModel
 
-        binding.root.setOnClickListener {
+        binding.root.apply {
+            setOnClickListener {
                 findNavController().navigate(
                     MainFragmentDirections.actionGoToPlayback()
                 )
             }
 
+            setOnLongClickListener {
+                playbackModel.navigateToPlayingSong()
+                true
+            }
+        }
+
         // --- VIEWMODEL SETUP ---
 
         playbackModel.song.observe(viewLifecycleOwner) {

app/src/main/java/org/oxycblt/auxio/playback/PlaybackFragment.kt

@@ -23,7 +23,6 @@ import org.oxycblt.auxio.ui.toColor
 class PlaybackFragment : Fragment(), SeekBar.OnSeekBarChangeListener {
     private val playbackModel: PlaybackViewModel by activityViewModels()
 
-    // TODO: Implement nav to artists/albums
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
@@ -78,6 +77,7 @@ class PlaybackFragment : Fragment(), SeekBar.OnSeekBarChangeListener {
         }
 
         // Make marquee scroll work
+        // TODO: Add nav here as well
         binding.playbackSong.isSelected = true
 
         binding.playbackSeekBar.setOnSeekBarChangeListener(this)
@@ -91,7 +91,7 @@ class PlaybackFragment : Fragment(), SeekBar.OnSeekBarChangeListener {
                 binding.song = it
                 binding.playbackSeekBar.max = it.seconds.toInt()
             } else {
-                Log.d(this::class.simpleName, "No song played anymore, leaving.")
+                Log.d(this::class.simpleName, "No song is being played, leaving.")
 
                 findNavController().navigateUp()
             }

app/src/main/java/org/oxycblt/auxio/playback/PlaybackViewModel.kt

@@ -16,7 +16,6 @@ import org.oxycblt.auxio.playback.state.PlaybackMode
 import org.oxycblt.auxio.playback.state.PlaybackStateManager
 
 // A ViewModel that acts as an intermediary between the UI and PlaybackStateManager
-// TODO: Implement User Queue
 // TODO: Implement Persistence through a Database
 class PlaybackViewModel : ViewModel(), PlaybackStateManager.Callback {
     // Playback
@@ -56,6 +55,9 @@ class PlaybackViewModel : ViewModel(), PlaybackStateManager.Callback {
     private val mIsSeeking = MutableLiveData(false)
     val isSeeking: LiveData<Boolean> get() = mIsSeeking
 
+    private val mNavToPlayingSong = MutableLiveData(false)
+    val navToPlayingSong: LiveData<Boolean> get() = mNavToPlayingSong
+
     val formattedPosition = Transformations.map(mPosition) {
         it.toDuration()
     }
@@ -206,6 +208,14 @@ class PlaybackViewModel : ViewModel(), PlaybackStateManager.Callback {
         mIsSeeking.value = value
     }
 
+    fun navigateToPlayingSong() {
+        mNavToPlayingSong.value = true
+    }
+
+    fun doneWithNavToPlayingSong() {
+        mNavToPlayingSong.value = false
+    }
+
     // --- OVERRIDES ---
 
     override fun onCleared() {

app/src/main/java/org/oxycblt/auxio/playback/state/PlaybackStateManager.kt

@@ -75,6 +75,7 @@ class PlaybackStateManager private constructor() {
             field = value
             callbacks.forEach { it.onLoopUpdate(value) }
         }
+    private var mIsInUserQueue = false
 
     val song: Song? get() = mSong
     val parent: BaseModel? get() = mParent
@@ -194,6 +195,8 @@ class PlaybackStateManager private constructor() {
         if (!mIsPlaying) {
             mIsPlaying = true
         }
+
+        mIsInUserQueue = false
     }
 
     fun setPosition(position: Long) {
@@ -220,6 +223,8 @@ class PlaybackStateManager private constructor() {
             updatePlayback(mUserQueue[0])
             mUserQueue.removeAt(0)
 
+            mIsInUserQueue = true
+
             forceUserQueueUpdate()
         } else {
             if (mIndex < mQueue.lastIndex) {
@@ -239,7 +244,7 @@ class PlaybackStateManager private constructor() {
     }
 
     fun prev() {
-        if (mIndex > 0) {
+        if (mIndex > 0 && !mIsInUserQueue) {
             mIndex = mIndex.dec()
         }