Improve navigation

Finally make parent navigation possible from artist albums and the like, along with heavily streamlining the main navigation code.

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

@@ -20,6 +20,7 @@ import org.oxycblt.auxio.ui.isEdgeOn
  * The single [AppCompatActivity] for Auxio.
  */
 class MainActivity : AppCompatActivity() {
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 

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

@@ -26,6 +26,7 @@ import org.oxycblt.auxio.ui.toColor
 
 /**
  * The primary "Home" [Fragment] for Auxio.
+ * TODO: Make navigation stack instead of artificially rerouting to LibraryFragment
  */
 class MainFragment : Fragment() {
     private val playbackModel: PlaybackViewModel by activityViewModels()
@@ -91,18 +92,19 @@ class MainFragment : Fragment() {
         }
 
         detailModel.navToItem.observe(viewLifecycleOwner) {
-            if (it != null) {
-                // If the current destination isn't even LibraryFragment, then navigate there first
-                if (binding.navBar.selectedItemId != R.id.library_fragment) {
+            if (it != null && navController != null) {
+                val curDest = navController.currentDestination?.id
+
+                val isOk = when (it) {
+                    is Song -> (detailModel.currentAlbum.value?.id == it.album.id) magic (curDest != R.id.album_detail_fragment)
+                    is Album -> (detailModel.currentAlbum.value?.id == it.id) magic (curDest != R.id.album_detail_fragment)
+                    is Artist -> (detailModel.currentArtist.value?.id == it.id) magic (curDest != R.id.artist_detail_fragment)
+
+                    else -> false
+                }
+
+                if (isOk) {
                     binding.navBar.selectedItemId = R.id.library_fragment
-                } else {
-                    // If the user currently is in library, check if its valid to navigate to the
-                    // item in question.
-                    if ((it is Album || it is Song) && shouldGoToAlbum(navController!!)) {
-                        binding.navBar.selectedItemId = R.id.library_fragment
-                    } else if (it is Artist && shouldGoToArtist(navController!!)) {
-                        binding.navBar.selectedItemId = R.id.library_fragment
-                    }
                 }
             }
         }
@@ -115,29 +117,14 @@ class MainFragment : Fragment() {
     }
 
     /**
-     * Whether its okay to navigate to the album detail fragment when the playing song/album needs to
-     * be navigated to
+     * Magic boolean logic that gets navigation working.
+     * true true -> true |
+     * true false -> false |
+     * false true -> true |
+     * false false -> false |
      */
-    private fun shouldGoToAlbum(controller: NavController): Boolean {
-        return (
-            controller.currentDestination!!.id == R.id.album_detail_fragment &&
-                detailModel.currentAlbum.value?.id != playbackModel.song.value!!.album.id
-            ) ||
-            controller.currentDestination!!.id == R.id.artist_detail_fragment ||
-            controller.currentDestination!!.id == R.id.genre_detail_fragment
-    }
-
-    /**
-     * Whether its okay to go to the artist detail fragment when the current playing artist
-     * is selected.
-     */
-    private fun shouldGoToArtist(controller: NavController): Boolean {
-        return (
-            controller.currentDestination!!.id == R.id.artist_detail_fragment &&
-                detailModel.currentArtist.value?.id != playbackModel.song.value!!.album.artist.id
-            ) ||
-            controller.currentDestination!!.id == R.id.album_detail_fragment ||
-            controller.currentDestination!!.id == R.id.genre_detail_fragment
+    private infix fun Boolean.magic(other: Boolean): Boolean {
+        return if (!this && !other) false else !(this && !other)
     }
 
     /**

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

@@ -86,13 +86,11 @@ class AlbumDetailFragment : DetailFragment() {
 
         detailModel.navToParent.observe(viewLifecycleOwner) {
             if (it) {
-                if (!args.fromArtist) {
-                    findNavController().navigate(
-                        AlbumDetailFragmentDirections.actionShowParentArtist(
-                            detailModel.currentAlbum.value!!.artist.id
-                        )
+                findNavController().navigate(
+                    AlbumDetailFragmentDirections.actionShowParentArtist(
+                        detailModel.currentAlbum.value!!.artist.id
                     )
-                }
+                )
 
                 detailModel.doneWithNavToParent()
             }

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

@@ -48,7 +48,7 @@ class ArtistDetailFragment : DetailFragment() {
                     detailModel.updateNavigationStatus(true)
 
                     findNavController().navigate(
-                        ArtistDetailFragmentDirections.actionShowAlbum(it.id, true)
+                        ArtistDetailFragmentDirections.actionShowAlbum(it.id)
                     )
                 }
             },

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

@@ -77,7 +77,7 @@ class GenreDetailFragment : DetailFragment() {
                     )
                 } else if (it is Album) {
                     findNavController().navigate(
-                        GenreDetailFragmentDirections.actionGoAlbum(it.id, false)
+                        GenreDetailFragmentDirections.actionGoAlbum(it.id)
                     )
                 }
 

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

@@ -120,7 +120,7 @@ class LibraryFragment : Fragment() {
                 when (baseModel) {
                     is Genre -> LibraryFragmentDirections.actionShowGenre(baseModel.id)
                     is Artist -> LibraryFragmentDirections.actionShowArtist(baseModel.id)
-                    is Album -> LibraryFragmentDirections.actionShowAlbum(baseModel.id, false)
+                    is Album -> LibraryFragmentDirections.actionShowAlbum(baseModel.id)
 
                     // If given model wasn't valid, then reset the navigation status
                     // and abort the navigation.

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

@@ -163,7 +163,7 @@ class SearchFragment : Fragment() {
                 when (baseModel) {
                     is Genre -> SearchFragmentDirections.actionShowGenre(baseModel.id)
                     is Artist -> SearchFragmentDirections.actionShowArtist(baseModel.id)
-                    is Album -> SearchFragmentDirections.actionShowAlbum(baseModel.id, false)
+                    is Album -> SearchFragmentDirections.actionShowAlbum(baseModel.id)
 
                     // If given model wasn't valid, then reset the navigation status
                     // and abort the navigation.

app/src/main/java/org/oxycblt/auxio/ui/InterfaceUtils.kt

@@ -7,16 +7,12 @@ import android.content.res.Configuration
 import android.content.res.Resources
 import android.graphics.Point
 import android.os.Build
-import android.text.SpannableString
 import android.text.Spanned
-import android.text.style.ForegroundColorSpan
 import android.util.DisplayMetrics
-import android.view.MenuItem
 import android.view.WindowManager
 import android.widget.ImageButton
 import android.widget.TextView
 import android.widget.Toast
-import androidx.annotation.ColorInt
 import androidx.annotation.ColorRes
 import androidx.annotation.PluralsRes
 import androidx.appcompat.app.AppCompatActivity

app/src/main/res/navigation/nav_explore.xml

@@ -56,9 +56,6 @@
         <argument
             android:name="albumId"
             app:argType="long" />
-        <argument
-            android:name="fromArtist"
-            app:argType="boolean" />
         <action
             android:id="@+id/action_show_parent_artist"
             app:destination="@id/artist_detail_fragment"