home: make no music action generic

This way the playlist view can switch to "New Playlist" if a load
finishes but the user hasn't made any playlists.

app/src/main/java/org/oxycblt/auxio/home/HomeGenerator.kt

@@ -36,6 +36,8 @@ interface HomeGenerator {
 
     fun release()
 
+    fun empty(): Boolean
+
     fun songs(): List<Song>
 
     fun albums(): List<Album>
@@ -49,6 +51,8 @@ interface HomeGenerator {
     fun tabs(): List<MusicType>
 
     interface Invalidator {
+        fun invalidateEmpty() {}
+
         fun invalidateMusic(type: MusicType, instructions: UpdateInstructions)
 
         fun invalidateTabs()
@@ -119,6 +123,8 @@ private class HomeGeneratorImpl(
     }
 
     override fun onMusicChanges(changes: MusicRepository.Changes) {
+        invalidator.invalidateEmpty()
+
         val library = musicRepository.library
         if (changes.deviceLibrary && library != null) {
             L.d("Refreshing library")
@@ -142,6 +148,9 @@ private class HomeGeneratorImpl(
         homeSettings.unregisterListener(this)
     }
 
+    override fun empty() =
+        musicRepository.library == null
+
     override fun songs() =
         musicRepository.library?.let { listSettings.songSort.songs(it.songs) } ?: emptyList()
 

app/src/main/java/org/oxycblt/auxio/home/HomeViewModel.kt

@@ -120,6 +120,10 @@ constructor(
     val playlistList: StateFlow<List<Playlist>>
         get() = _playlistList
 
+    private val _empty = MutableStateFlow(false)
+    val empty: StateFlow<Boolean>
+        get() = _empty
+
     private val _playlistInstructions = MutableEvent<UpdateInstructions>()
     /** Instructions for how to update [genreList] in the UI. */
     val playlistInstructions: Event<UpdateInstructions>
@@ -129,6 +133,7 @@ constructor(
     val playlistSort: Sort
         get() = listSettings.playlistSort
 
+
     private val homeGenerator = homeGeneratorFactory.create(this)
 
     /**
@@ -172,6 +177,10 @@ constructor(
         homeGenerator.release()
     }
 
+    override fun invalidateEmpty() {
+        _empty.value = homeGenerator.empty()
+    }
+
     override fun invalidateMusic(type: MusicType, instructions: UpdateInstructions) {
         when (type) {
             MusicType.SONGS -> {

app/src/main/java/org/oxycblt/auxio/home/list/AlbumListFragment.kt

@@ -87,9 +87,10 @@ class AlbumListFragment :
         }
         binding.homeNoMusicMsg.text = getString(R.string.lng_empty_albums)
 
-        binding.homeChooseMusicSources.setOnClickListener { homeModel.startChooseMusicLocations() }
+        binding.homeNoMusicAction.setOnClickListener { homeModel.startChooseMusicLocations() }
 
         collectImmediately(homeModel.albumList, ::updateAlbums)
+        collectImmediately(homeModel.empty, ::updateNoMusicIndicator)
         collectImmediately(listModel.selected, ::updateSelection)
         collectImmediately(
             playbackModel.song, playbackModel.parent, playbackModel.isPlaying, ::updatePlayback)
@@ -154,13 +155,15 @@ class AlbumListFragment :
     }
 
     private fun updateAlbums(albums: List<Album>) {
-        requireBinding().apply {
-            homeRecycler.isInvisible = albums.isEmpty()
-            homeNoMusic.isInvisible = albums.isNotEmpty()
-        }
         albumAdapter.update(albums, homeModel.albumInstructions.consume())
     }
 
+    private fun updateNoMusicIndicator(empty: Boolean) {
+        val binding = requireBinding()
+        binding.homeRecycler.isInvisible = empty
+        binding.homeNoMusic.isInvisible = !empty
+    }
+
     private fun updateSelection(selection: List<Music>) {
         albumAdapter.setSelected(selection.filterIsInstanceTo(mutableSetOf()))
     }

app/src/main/java/org/oxycblt/auxio/home/list/ArtistListFragment.kt

@@ -81,9 +81,10 @@ class ArtistListFragment :
         }
         binding.homeNoMusicMsg.text = getString(R.string.lng_empty_artists)
 
-        binding.homeChooseMusicSources.setOnClickListener { homeModel.startChooseMusicLocations() }
+        binding.homeNoMusicAction.setOnClickListener { homeModel.startChooseMusicLocations() }
 
         collectImmediately(homeModel.artistList, ::updateArtists)
+        collectImmediately(homeModel.empty, ::updateNoMusicIndicator)
         collectImmediately(listModel.selected, ::updateSelection)
         collectImmediately(
             playbackModel.song, playbackModel.parent, playbackModel.isPlaying, ::updatePlayback)
@@ -129,13 +130,15 @@ class ArtistListFragment :
     }
 
     private fun updateArtists(artists: List<Artist>) {
-        requireBinding().apply {
-            homeRecycler.isInvisible = artists.isEmpty()
-            homeNoMusic.isInvisible = artists.isNotEmpty()
-        }
         artistAdapter.update(artists, homeModel.artistInstructions.consume())
     }
 
+    private fun updateNoMusicIndicator(empty: Boolean) {
+        val binding = requireBinding()
+        binding.homeRecycler.isInvisible = empty
+        binding.homeNoMusic.isInvisible = !empty
+    }
+
     private fun updateSelection(selection: List<Music>) {
         artistAdapter.setSelected(selection.filterIsInstanceTo(mutableSetOf()))
     }

app/src/main/java/org/oxycblt/auxio/home/list/GenreListFragment.kt

@@ -80,9 +80,10 @@ class GenreListFragment :
         }
         binding.homeNoMusicMsg.text = getString(R.string.lng_empty_genres)
 
-        binding.homeChooseMusicSources.setOnClickListener { homeModel.startChooseMusicLocations() }
+        binding.homeNoMusicAction.setOnClickListener { homeModel.startChooseMusicLocations() }
 
         collectImmediately(homeModel.genreList, ::updateGenres)
+        collectImmediately(homeModel.empty, ::updateNoMusicIndicator)
         collectImmediately(listModel.selected, ::updateSelection)
         collectImmediately(
             playbackModel.song, playbackModel.parent, playbackModel.isPlaying, ::updatePlayback)
@@ -128,13 +129,15 @@ class GenreListFragment :
     }
 
     private fun updateGenres(genres: List<Genre>) {
-        requireBinding().apply {
-            homeRecycler.isInvisible = genres.isEmpty()
-            homeNoMusic.isInvisible = genres.isNotEmpty()
-        }
         genreAdapter.update(genres, homeModel.genreInstructions.consume())
     }
 
+    private fun updateNoMusicIndicator(empty: Boolean) {
+        val binding = requireBinding()
+        binding.homeRecycler.isInvisible = empty
+        binding.homeNoMusic.isInvisible = !empty
+    }
+
     private fun updateSelection(selection: List<Music>) {
         genreAdapter.setSelected(selection.filterIsInstanceTo(mutableSetOf()))
     }

app/src/main/java/org/oxycblt/auxio/home/list/PlaylistListFragment.kt

@@ -78,9 +78,8 @@ class PlaylistListFragment :
         }
         binding.homeNoMusicMsg.text = getString(R.string.lng_empty_playlists)
 
-        binding.homeChooseMusicSources.setOnClickListener { homeModel.startChooseMusicLocations() }
-
         collectImmediately(homeModel.playlistList, ::updatePlaylists)
+        collectImmediately(homeModel.empty, homeModel.playlistList, ::updateNoMusicIndicator)
         collectImmediately(listModel.selected, ::updateSelection)
         collectImmediately(
             playbackModel.song, playbackModel.parent, playbackModel.isPlaying, ::updatePlayback)
@@ -126,13 +125,22 @@ class PlaylistListFragment :
     }
 
     private fun updatePlaylists(playlists: List<Playlist>) {
-        requireBinding().apply {
-            homeRecycler.isInvisible = playlists.isEmpty()
-            homeNoMusic.isInvisible = playlists.isNotEmpty()
-        }
         playlistAdapter.update(playlists, homeModel.playlistInstructions.consume())
     }
 
+    private fun updateNoMusicIndicator(empty: Boolean, playlists: List<Playlist>) {
+        val binding = requireBinding()
+        binding.homeRecycler.isInvisible = empty
+        binding.homeNoMusic.isInvisible = !empty && playlists.isNotEmpty()
+        if (!empty && playlists.isEmpty()) {
+            binding.homeNoMusicAction.text = getString(R.string.lbl_new_playlist)
+            binding.homeNoMusicAction.setOnClickListener { musicModel.createPlaylist() }
+        } else {
+            binding.homeNoMusicAction.text = getString(R.string.lbl_music_sources)
+            binding.homeNoMusicAction.setOnClickListener { homeModel.startChooseMusicLocations() }
+        }
+    }
+
     private fun updateSelection(selection: List<Music>) {
         playlistAdapter.setSelected(selection.filterIsInstanceTo(mutableSetOf()))
     }

app/src/main/java/org/oxycblt/auxio/home/list/SongListFragment.kt

@@ -85,9 +85,10 @@ class SongListFragment :
         }
         binding.homeNoMusicMsg.text = getString(R.string.lng_empty_songs)
 
-        binding.homeChooseMusicSources.setOnClickListener { homeModel.startChooseMusicLocations() }
+        binding.homeNoMusicAction.setOnClickListener { homeModel.startChooseMusicLocations() }
 
         collectImmediately(homeModel.songList, ::updateSongs)
+        collectImmediately(homeModel.empty, ::updateNoMusicIndicator)
         collectImmediately(listModel.selected, ::updateSelection)
         collectImmediately(
             playbackModel.song, playbackModel.parent, playbackModel.isPlaying, ::updatePlayback)
@@ -154,13 +155,15 @@ class SongListFragment :
     }
 
     private fun updateSongs(songs: List<Song>) {
-        requireBinding().apply {
-            homeRecycler.isInvisible = songs.isEmpty()
-            homeNoMusic.isInvisible = songs.isNotEmpty()
-        }
         songAdapter.update(songs, homeModel.songInstructions.consume())
     }
 
+    private fun updateNoMusicIndicator(empty: Boolean) {
+        val binding = requireBinding()
+        binding.homeRecycler.isInvisible = empty
+        binding.homeNoMusic.isInvisible = !empty
+    }
+
     private fun updateSelection(selection: List<Music>) {
         songAdapter.setSelected(selection.filterIsInstanceTo(mutableSetOf()))
     }

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

@@ -46,7 +46,7 @@
                 android:textAppearance="?attr/textAppearanceBodyLarge" />
 
             <org.oxycblt.auxio.ui.RippleFixMaterialButton
-                android:id="@+id/home_choose_music_sources"
+                android:id="@+id/home_no_music_action"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:text="@string/lbl_music_sources" />