Add seperate queue types

Add seperate queue types for different contexts, such as playing a song from an album.

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

@@ -7,14 +7,12 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
-import androidx.fragment.app.activityViewModels
 import androidx.navigation.fragment.findNavController
 import androidx.viewpager2.adapter.FragmentStateAdapter
 import com.google.android.material.tabs.TabLayout
 import com.google.android.material.tabs.TabLayoutMediator
 import org.oxycblt.auxio.databinding.FragmentMainBinding
 import org.oxycblt.auxio.library.LibraryFragment
-import org.oxycblt.auxio.loading.LoadingViewModel
 import org.oxycblt.auxio.music.MusicStore
 import org.oxycblt.auxio.songs.SongsFragment
 import org.oxycblt.auxio.theme.accent
@@ -23,10 +21,6 @@ import org.oxycblt.auxio.theme.getTransparentAccent
 import org.oxycblt.auxio.theme.toColor
 
 class MainFragment : Fragment() {
-    private val loadingModel: LoadingViewModel by activityViewModels {
-        LoadingViewModel.Factory(requireActivity().application)
-    }
-
     private val shownFragments = listOf(0, 1)
     private val tabIcons = listOf(
         R.drawable.ic_library,

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

@@ -13,6 +13,7 @@ import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.FragmentAlbumDetailBinding
 import org.oxycblt.auxio.detail.adapters.DetailSongAdapter
 import org.oxycblt.auxio.music.MusicStore
+import org.oxycblt.auxio.playback.PlaybackMode
 import org.oxycblt.auxio.playback.PlaybackViewModel
 import org.oxycblt.auxio.theme.applyDivider
 import org.oxycblt.auxio.theme.disable
@@ -44,7 +45,7 @@ class AlbumDetailFragment : Fragment() {
         }
 
         val songAdapter = DetailSongAdapter {
-            playbackModel.update(it)
+            playbackModel.update(it, PlaybackMode.IN_ALBUM)
         }
 
         // --- UI SETUP ---

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

@@ -25,6 +25,7 @@ import org.oxycblt.auxio.music.BaseModel
 import org.oxycblt.auxio.music.Genre
 import org.oxycblt.auxio.music.MusicStore
 import org.oxycblt.auxio.music.Song
+import org.oxycblt.auxio.playback.PlaybackMode
 import org.oxycblt.auxio.playback.PlaybackViewModel
 import org.oxycblt.auxio.theme.applyColor
 import org.oxycblt.auxio.theme.applyDivider
@@ -181,7 +182,7 @@ class LibraryFragment : Fragment(), SearchView.OnQueryTextListener {
         // If the item is a song [That was selected through search], then update the playback
         // to that song instead of doing any navigation
         if (baseModel is Song) {
-            playbackModel.update(baseModel)
+            playbackModel.update(baseModel, PlaybackMode.ALL_SONGS)
             return
         }
 

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

@@ -0,0 +1,10 @@
+package org.oxycblt.auxio.playback
+
+// Enum for instruction how the queue should function.
+// ALL SONGS -> Play from all songs
+// IN_GENRE -> Play from the genre
+// IN_ARTIST -> Play from the songs of the artist
+// IN_ALBUM -> Play from the songs of the album
+enum class PlaybackMode {
+    ALL_SONGS, IN_GENRE, IN_ARTIST, IN_ALBUM
+}

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

@@ -1,5 +1,6 @@
 package org.oxycblt.auxio.playback
 
+import android.util.Log
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.Transformations
@@ -9,6 +10,7 @@ import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.music.toDuration
 
 // TODO: Implement media controls
+// TODO: Implement persistence
 // TODO: Add the playback service itself
 // TODO: Possibly add some swipe-to-next-track function, could require a ViewPager.
 // A ViewModel that acts as an intermediary between PlaybackService and the Playback Fragments.
@@ -16,14 +18,15 @@ class PlaybackViewModel : ViewModel() {
     private val mCurrentSong = MutableLiveData<Song>()
     val currentSong: LiveData<Song> get() = mCurrentSong
 
-    private val mCurrentIndex = MutableLiveData(0)
-    val currentIndex: LiveData<Int> get() = mCurrentIndex
-
     private val mQueue = MutableLiveData(mutableListOf<Song>())
     val queue: LiveData<MutableList<Song>> get() = mQueue
 
+    private val mCurrentIndex = MutableLiveData(0)
+    val currentIndex: LiveData<Int> get() = mCurrentIndex
+
+    private val mCurrentMode = MutableLiveData(PlaybackMode.ALL_SONGS)
+
     private val mCurrentDuration = MutableLiveData(0L)
-    val currentDuration: LiveData<Long> get() = mCurrentDuration
 
     private val mIsPlaying = MutableLiveData(false)
     val isPlaying: LiveData<Boolean> get() = mIsPlaying
@@ -32,22 +35,43 @@ class PlaybackViewModel : ViewModel() {
     val isSeeking: LiveData<Boolean> get() = mIsSeeking
 
     // Formatted variants of the duration
-    val formattedCurrentDuration = Transformations.map(currentDuration) {
+    val formattedCurrentDuration = Transformations.map(mCurrentDuration) {
         it.toDuration()
     }
 
-    val formattedSeekBarProgress = Transformations.map(currentDuration) {
+    val formattedSeekBarProgress = Transformations.map(mCurrentDuration) {
         if (mCurrentSong.value != null) it.toInt() else 0
     }
 
-    // Update the current song while changing the queue to All Songs.
-    fun update(song: Song) {
+    // Update the current song while changing the queue mode.
+    fun update(song: Song, mode: PlaybackMode) {
+        Log.d(this::class.simpleName, "Updating song to ${song.name} and mode to $mode")
+
         val musicStore = MusicStore.getInstance()
 
         updatePlayback(song)
 
-        mQueue.value = musicStore.songs.toMutableList()
-        mCurrentIndex.value = musicStore.songs.indexOf(song)
+        mQueue.value = when (mode) {
+            PlaybackMode.ALL_SONGS -> musicStore.songs.toMutableList()
+            PlaybackMode.IN_ARTIST -> song.album.artist.songs
+            PlaybackMode.IN_ALBUM -> song.album.songs
+
+            // Warning: Calling update() with a mode of IN_GENRE Will cause Auxio to play
+            // from the artist's most prominent genre instead of the song's genre.
+            // FIXME: This could be fixed by moving genre loading to songs
+            PlaybackMode.IN_GENRE -> {
+                Log.d(
+                    this::class.simpleName,
+                    "update() was called with IN_GENRES, using " +
+                        "most prominent genre instead of the song's genre."
+                )
+
+                song.album.artist.genres[0].songs
+            }
+        }
+
+        mCurrentMode.value = mode
+        mCurrentIndex.value = mQueue.value!!.indexOf(song)
     }
 
     private fun updatePlayback(song: Song) {

app/src/main/java/org/oxycblt/auxio/songs/SongsFragment.kt

@@ -9,6 +9,7 @@ import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
 import org.oxycblt.auxio.databinding.FragmentSongsBinding
 import org.oxycblt.auxio.music.MusicStore
+import org.oxycblt.auxio.playback.PlaybackMode
 import org.oxycblt.auxio.playback.PlaybackViewModel
 import org.oxycblt.auxio.theme.applyDivider
 
@@ -31,7 +32,7 @@ class SongsFragment : Fragment() {
 
         binding.songRecycler.apply {
             adapter = SongAdapter(musicStore.songs) {
-                playbackModel.update(it)
+                playbackModel.update(it, PlaybackMode.ALL_SONGS)
             }
             applyDivider()
             setHasFixedSize(true)

app/src/main/java/org/oxycblt/auxio/theme/ThemeUtils.kt

@@ -96,13 +96,16 @@ fun MenuItem.applyColor(@ColorInt color: Int) {
 
 // Disable an ImageButton
 fun ImageButton.disable(context: Context) {
-    imageTintList = ColorStateList.valueOf(
-        R.color.inactive_color.toColor(context)
-    )
+    if (isEnabled) {
+        imageTintList = ColorStateList.valueOf(
+            R.color.inactive_color.toColor(context)
+        )
 
-    isEnabled = false
+        isEnabled = false
+    }
 }
 
+// Enable an ImageButton
 fun ImageButton.enable(context: Context) {
     if (!isEnabled) {
         imageTintList = ColorStateList.valueOf(