[gnome-music/wip/mschraal/coremodel-use-flattened-main-models: 1/2] coremodel: Flatten the core models

[Marinus Schraal <mschraal src gnome org>]

commit 96ed5c14342b00db05dd9aea2b2f6595aaeb7d90
Author: Marinus Schraal <mschraal gnome org>
Date:   Fri Jun 12 14:03:02 2020 +0200

    coremodel: Flatten the core models
    
    The core songs, albums and artists models are filled by the Grilo source
    wrappers directly. This is feasible with just Tracker being the main
    source in use. However, when adding new sources it becomes cumbersome to
    have all sources manipulate the core listmodels directly.
    
    Instead make the core listmodel a FlattenListModel. A source can now
    use it's own local listmodel and easily manipulate this, without having
    to deal with any of the other sources items.

 gnomemusic/coremodel.py                       | 31 ++++++++++++++++++++++++---
 gnomemusic/grilowrappers/grltrackerwrapper.py | 11 ++++++----
 2 files changed, 35 insertions(+), 7 deletions(-)
---
diff --git a/gnomemusic/coremodel.py b/gnomemusic/coremodel.py
index 75a1e21c..ca91001f 100644
--- a/gnomemusic/coremodel.py
+++ b/gnomemusic/coremodel.py
@@ -28,6 +28,7 @@ import gi
 gi.require_version("Gfm", "0.1")
 from gi.repository import GObject, Gio, Gfm, Gtk
 
+from gnomemusic.corealbum import CoreAlbum
 from gnomemusic.coreartist import CoreArtist
 from gnomemusic.coresong import CoreSong
 from gnomemusic.grilowrappers.grltrackerplaylists import Playlist
@@ -83,17 +84,23 @@ class CoreModel(GObject.GObject):
         self._current_playlist_model = None
         self._previous_playlist_model = None
 
-        self._songs_model = Gio.ListStore.new(CoreSong)
+        self._songs_model_proxy = Gio.ListStore.new(Gio.ListModel)
+        self._songs_model = Gfm.FlattenListModel.new(
+            CoreSong, self._songs_model_proxy)
         self._songliststore = SongListStore(self._songs_model)
 
         self._application = application
 
-        self._albums_model = Gio.ListStore()
+        self._albums_model_proxy = Gio.ListStore.new(Gio.ListModel)
+        self._albums_model = Gfm.FlattenListModel.new(
+            CoreAlbum, self._albums_model_proxy)
         self._albums_model_sort = Gfm.SortListModel.new(self._albums_model)
         self._albums_model_sort.set_sort_func(
             utils.wrap_list_store_sort_func(self._albums_sort))
 
-        self._artists_model = Gio.ListStore.new(CoreArtist)
+        self._artists_model_proxy = Gio.ListStore.new(Gio.ListModel)
+        self._artists_model = Gfm.FlattenListModel.new(
+            CoreArtist, self._artists_model_proxy)
         self._artists_model_sort = Gfm.SortListModel.new(self._artists_model)
         self._artists_model_sort.set_sort_func(
             utils.wrap_list_store_sort_func(self._artist_sort))
@@ -297,16 +304,34 @@ class CoreModel(GObject.GObject):
     def songs(self):
         return self._songs_model
 
+    @GObject.Property(
+        type=Gfm.FlattenListModel, default=None,
+        flags=GObject.ParamFlags.READABLE)
+    def songs_proxy(self):
+        return self._songs_model_proxy
+
     @GObject.Property(
         type=Gio.ListStore, default=None, flags=GObject.ParamFlags.READABLE)
     def albums(self):
         return self._albums_model
 
+    @GObject.Property(
+        type=Gfm.FlattenListModel, default=None,
+        flags=GObject.ParamFlags.READABLE)
+    def albums_proxy(self):
+        return self._albums_model_proxy
+
     @GObject.Property(
         type=Gio.ListStore, default=None, flags=GObject.ParamFlags.READABLE)
     def artists(self):
         return self._artists_model
 
+    @GObject.Property(
+        type=Gfm.FlattenListModel, default=None,
+        flags=GObject.ParamFlags.READABLE)
+    def artists_proxy(self):
+        return self._artists_model_proxy
+
     @GObject.Property(
         type=Gio.ListStore, default=None, flags=GObject.ParamFlags.READABLE)
     def playlist(self):
diff --git a/gnomemusic/grilowrappers/grltrackerwrapper.py b/gnomemusic/grilowrappers/grltrackerwrapper.py
index 11f6ddf2..8f50f8ba 100644
--- a/gnomemusic/grilowrappers/grltrackerwrapper.py
+++ b/gnomemusic/grilowrappers/grltrackerwrapper.py
@@ -24,7 +24,7 @@
 
 import gi
 gi.require_versions({"Gfm": "0.1", "Grl": "0.3", 'Tracker': "2.0"})
-from gi.repository import Gfm, Grl, GLib, GObject, Tracker
+from gi.repository import Gfm, Gio, Grl, GLib, GObject, Tracker
 
 from gnomemusic.corealbum import CoreAlbum
 from gnomemusic.coreartist import CoreArtist
@@ -73,11 +73,14 @@ class GrlTrackerWrapper(GObject.GObject):
         self._application = application
         self._coremodel = application.props.coremodel
         self._log = application.props.log
-        self._songs_model = self._coremodel.props.songs
+        self._songs_model = Gio.ListStore.new(CoreSong)
+        self._coremodel.props.songs_proxy.append(self._songs_model)
         self._source = None
-        self._albums_model = self._coremodel.props.albums
+        self._albums_model = Gio.ListStore.new(CoreAlbum)
+        self._coremodel.props.albums_proxy.append(self._albums_model)
         self._album_ids = {}
-        self._artists_model = self._coremodel.props.artists
+        self._artists_model = Gio.ListStore.new(CoreArtist)
+        self._coremodel.props.artists_proxy.append(self._artists_model)
         self._artist_ids = {}
         self._hash = {}
         self._song_search_proxy = self._coremodel.props.songs_search_proxy