Asynchronously compute lists headers

Allows to load lists faster, but UI has to be ready to load headers
later

application/vlc-android/src/org/videolan/vlc/providers/medialibrary/AlbumsProvider.kt

@@ -21,7 +21,9 @@
 package org.videolan.vlc.providers.medialibrary
 
 import android.content.Context
+import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.launch
 import org.videolan.medialibrary.interfaces.Medialibrary
 import org.videolan.medialibrary.interfaces.media.Album
 import org.videolan.medialibrary.interfaces.media.Artist
@@ -59,7 +61,8 @@ class AlbumsProvider(val parent : MediaLibraryItem?, context: Context, model: So
             is Genre -> parent.searchAlbums(model.filterQuery, sort, desc, loadSize, startposition)
             else -> medialibrary.searchAlbum(model.filterQuery, sort, desc, loadSize, startposition)
         }
-        return list.also { completeHeaders(it, startposition) }
+        model.viewModelScope.launch { completeHeaders(list, startposition) }
+        return list
     }
 
     override fun getTotalCount() = if (model.filterQuery == null) when(parent) {

application/vlc-android/src/org/videolan/vlc/providers/medialibrary/ArtistsProvider.kt

@@ -21,7 +21,9 @@
 package org.videolan.vlc.providers.medialibrary
 
 import android.content.Context
+import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.launch
 import org.videolan.medialibrary.interfaces.media.Artist
 import org.videolan.vlc.viewmodels.SortableModel
 
@@ -34,7 +36,8 @@ class ArtistsProvider(context: Context, model: SortableModel, var showAll: Boole
     override fun getPage(loadSize: Int, startposition: Int): Array<Artist> {
         val list = if (model.filterQuery == null) medialibrary.getPagedArtists(showAll, sort, desc, loadSize, startposition)
         else medialibrary.searchArtist(model.filterQuery, sort, desc, loadSize, startposition)
-        return list.also { completeHeaders(it, startposition) }
+        model.viewModelScope.launch { completeHeaders(list, startposition) }
+        return list
     }
 
     override fun getTotalCount() = if (model.filterQuery == null) medialibrary.getArtistsCount(showAll)

application/vlc-android/src/org/videolan/vlc/providers/medialibrary/FoldersProvider.kt

@@ -21,8 +21,11 @@
 package org.videolan.vlc.providers.medialibrary
 
 import android.content.Context
+import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.launch
 import org.videolan.medialibrary.interfaces.media.Folder
+import org.videolan.tools.Settings
 import org.videolan.vlc.viewmodels.SortableModel
 
 
@@ -36,6 +39,5 @@ class FoldersProvider(context: Context, model: SortableModel, val type: Int) : M
         medialibrary.getFolders(type, sort, desc, loadSize, startposition).also { completeHeaders(it, startposition) }
     } else {
         medialibrary.searchFolders(model.filterQuery, sort, desc, loadSize, startposition)
-    }
-
+    }.also { if (Settings.showTvUi) completeHeaders(it, startposition) }
 }
\ No newline at end of file

application/vlc-android/src/org/videolan/vlc/providers/medialibrary/GenresProvider.kt

@@ -21,7 +21,9 @@
 package org.videolan.vlc.providers.medialibrary
 
 import android.content.Context
+import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.launch
 import org.videolan.medialibrary.interfaces.media.Genre
 import org.videolan.vlc.viewmodels.SortableModel
 
@@ -34,7 +36,8 @@ class GenresProvider(context: Context, model: SortableModel) : MedialibraryProvi
     override fun getPage(loadSize: Int, startposition: Int) : Array<Genre> {
         val list = if (model.filterQuery == null) medialibrary.getPagedGenres(sort, desc, loadSize, startposition)
         else medialibrary.searchGenre(model.filterQuery, sort, desc, loadSize, startposition)
-        return list.also { completeHeaders(it, startposition) }
+        model.viewModelScope.launch { completeHeaders(list, startposition) }
+        return list
     }
 
     override fun getTotalCount() = if (model.filterQuery == null) medialibrary.genresCount else medialibrary.getGenresCount(model.filterQuery)

application/vlc-android/src/org/videolan/vlc/providers/medialibrary/PlaylistsProvider.kt

@@ -21,7 +21,9 @@
 package org.videolan.vlc.providers.medialibrary
 
 import android.content.Context
+import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.launch
 import org.videolan.medialibrary.interfaces.media.Playlist
 import org.videolan.vlc.viewmodels.SortableModel
 
@@ -34,7 +36,8 @@ class PlaylistsProvider(context: Context, model: SortableModel) : MedialibraryPr
     override fun getPage(loadSize: Int, startposition: Int)  : Array<Playlist> {
         val list = if (model.filterQuery == null) medialibrary.getPagedPlaylists(sort, desc, loadSize, startposition)
         else medialibrary.searchPlaylist(model.filterQuery, sort, desc, loadSize, startposition)
-        return list.also { completeHeaders(it, startposition) }
+        model.viewModelScope.launch { completeHeaders(list, startposition) }
+        return list
     }
 
     override fun getTotalCount() = if (model.filterQuery == null) medialibrary.playlistsCount else medialibrary.getPlaylistsCount(model.filterQuery)

application/vlc-android/src/org/videolan/vlc/providers/medialibrary/TracksProvider.kt

@@ -21,7 +21,9 @@
 package org.videolan.vlc.providers.medialibrary
 
 import android.content.Context
+import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.launch
 import org.videolan.medialibrary.interfaces.Medialibrary
 import org.videolan.medialibrary.interfaces.media.*
 import org.videolan.medialibrary.media.MediaLibraryItem
@@ -67,7 +69,8 @@ class TracksProvider(val parent : MediaLibraryItem?, context: Context, model: So
             is Playlist -> parent.searchTracks(model.filterQuery, sort, desc, loadSize, startposition)
             else -> medialibrary.searchAudio(model.filterQuery, sort, desc, loadSize, startposition)
         }
-        return list.also { completeHeaders(it, startposition) }
+        model.viewModelScope.launch { completeHeaders(list, startposition) }
+        return list
     }
 
     override fun getTotalCount() = if (model.filterQuery == null) when (parent) {

application/vlc-android/src/org/videolan/vlc/providers/medialibrary/VideoGroupsProvider.kt

 package org.videolan.vlc.providers.medialibrary
 
 import android.content.Context
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.launch
 import org.videolan.medialibrary.interfaces.Medialibrary
 import org.videolan.medialibrary.interfaces.media.VideoGroup
 import org.videolan.medialibrary.media.MediaLibraryItem
@@ -22,7 +24,7 @@ class VideoGroupsProvider(context: Context, model: SortableModel) : Medialibrary
         medialibrary.getVideoGroups(sort, desc, loadSize, startposition)
     } else {
         medialibrary.searchVideoGroups(model.filterQuery, sort, desc, loadSize, startposition)
-    }.extractSingles().also { if (Settings.showTvUi)completeHeaders(it, startposition) }
+    }.extractSingles().also { if (Settings.showTvUi) completeHeaders(it, startposition) }
 }
 
 private fun Array<VideoGroup>.extractSingles() = map {

application/vlc-android/src/org/videolan/vlc/providers/medialibrary/VideosProvider.kt

@@ -21,7 +21,9 @@
 package org.videolan.vlc.providers.medialibrary
 
 import android.content.Context
+import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.launch
 import org.videolan.medialibrary.interfaces.media.Folder
 import org.videolan.medialibrary.interfaces.media.MediaWrapper
 import org.videolan.medialibrary.interfaces.media.VideoGroup
@@ -56,7 +58,8 @@ class VideosProvider(val folder : Folder?, val group: VideoGroup?, context: Cont
             group !== null -> group.searchTracks(model.filterQuery, sort, desc, loadSize, startposition)
             else -> medialibrary.searchVideo(model.filterQuery, sort, desc, loadSize, startposition)
         }
-        return list.also { completeHeaders(it, startposition) }
+        model.viewModelScope.launch { completeHeaders(list, startposition) }
+        return list
     }
 
     override fun getAll(): Array<MediaWrapper> = when {