[gnome-photos/wip/rishi/view-model: 5/5] Remove the mode-specific filtering from PhotosViewModel

[Debarshi Ray <debarshir src gnome org>]

commit 23051954ff91928b5f37f193b734c90c33ced99a
Author: Debarshi Ray <debarshir gnome org>
Date:   Tue Aug 23 21:14:09 2016 +0200

    Remove the mode-specific filtering from PhotosViewModel
    
    Now that ItemManager has separate child BaseManagers for each mode, we
    can greatly simplify ViewModel by removing the mode-specific filtering
    logic. This was needed earlier when we had one single global bucket
    inside ItemManager where the results of the mode-specific queries, and
    we had to filter the contents of the bucket for each ViewModel. Not any
    more.
    
    From now on, ViewModel will simply mirror the contents of each
    mode-specific child BaseManager.
    
    The code to move a BaseItem from one mode to another, when any of its
    attributes change (eg., it gets favorited), now resides inside
    ItemManager.

 src/photos-item-manager.c       |   55 +++++++++++++++++++++++-
 src/photos-tracker-controller.c |    9 +++-
 src/photos-view-model.c         |   90 +++------------------------------------
 3 files changed, 68 insertions(+), 86 deletions(-)
---
diff --git a/src/photos-item-manager.c b/src/photos-item-manager.c
index 194c274..df086fa 100644
--- a/src/photos-item-manager.c
+++ b/src/photos-item-manager.c
@@ -331,6 +331,50 @@ photos_item_manager_get_where (PhotosBaseManager *mngr, gint flags)
 
 
 static void
+photos_item_manager_info_updated (PhotosBaseItem *item, gpointer user_data)
+{
+  PhotosItemManager *self = PHOTOS_ITEM_MANAGER (user_data);
+  PhotosBaseItem *updated_item;
+  gboolean is_collection;
+  gboolean is_favorite;
+  const gchar *id;
+
+  g_return_if_fail (PHOTOS_IS_BASE_ITEM (item));
+
+  id = photos_filterable_get_id (PHOTOS_FILTERABLE (item));
+  updated_item = PHOTOS_BASE_ITEM (photos_base_manager_get_object_by_id (PHOTOS_BASE_MANAGER (self), id));
+  g_return_if_fail (updated_item == item);
+
+  is_collection = photos_base_item_is_collection (item);
+  is_favorite = photos_base_item_is_favorite (item);
+
+  if (is_collection)
+    {
+      if (self->active_collection == NULL)
+        photos_base_manager_add_object (self->item_mngr_chldrn[PHOTOS_WINDOW_MODE_COLLECTIONS], G_OBJECT 
(item));
+    }
+  else
+    {
+      if (is_favorite)
+        photos_base_manager_add_object (self->item_mngr_chldrn[PHOTOS_WINDOW_MODE_FAVORITES], G_OBJECT 
(item));
+
+      photos_base_manager_add_object (self->item_mngr_chldrn[PHOTOS_WINDOW_MODE_OVERVIEW], G_OBJECT (item));
+    }
+
+  if (is_collection)
+    {
+      photos_base_manager_remove_object (self->item_mngr_chldrn[PHOTOS_WINDOW_MODE_FAVORITES], G_OBJECT 
(item));
+      photos_base_manager_remove_object (self->item_mngr_chldrn[PHOTOS_WINDOW_MODE_OVERVIEW], G_OBJECT 
(item));
+    }
+  else
+    {
+      if (self->active_collection == NULL)
+        photos_base_manager_remove_object (self->item_mngr_chldrn[PHOTOS_WINDOW_MODE_COLLECTIONS], G_OBJECT 
(item));
+    }
+}
+
+
+static void
 photos_item_manager_item_load (GObject *source_object, GAsyncResult *res, gpointer user_data)
 {
   PhotosItemManager *self = PHOTOS_ITEM_MANAGER (user_data);
@@ -375,6 +419,7 @@ photos_item_manager_remove_object_by_id (PhotosBaseManager *mngr, const gchar *i
   if (item == NULL)
     return;
 
+  g_signal_handlers_disconnect_by_func (item, photos_item_manager_info_updated, self);
   g_object_ref (item);
 
   for (i = 0; self->item_mngr_chldrn[i] != NULL; i++)
@@ -754,27 +799,33 @@ photos_item_manager_add_item_for_mode (PhotosItemManager *self, PhotosWindowMode
   if (item != NULL)
     {
       g_object_ref (item);
-      g_signal_emit_by_name (item_mngr_chld, "object-added", G_OBJECT (item));
     }
   else
     {
+      gboolean already_present = FALSE;
+
       item = PHOTOS_BASE_ITEM (photos_base_manager_get_object_by_id (PHOTOS_BASE_MANAGER (self), id));
       if (item != NULL)
         {
           g_object_ref (item);
+          already_present = TRUE;
         }
       else
         {
           item = photos_item_manager_create_item (self, cursor);
           if (photos_base_item_is_collection (item))
             g_hash_table_insert (self->collections, g_strdup (id), g_object_ref (item));
+
+          g_signal_connect_object (item, "info-updated", G_CALLBACK (photos_item_manager_info_updated), 
self, 0);
         }
 
       photos_base_manager_add_object (item_mngr_chld, G_OBJECT (item));
       photos_base_manager_add_object (self->item_mngr_chldrn[0], G_OBJECT (item));
+
+      if (!already_present)
+        g_signal_emit_by_name (self, "object-added", G_OBJECT (item));
     }
 
-  g_signal_emit_by_name (self, "object-added", G_OBJECT (item));
   g_clear_object (&item);
 }
 
diff --git a/src/photos-tracker-controller.c b/src/photos-tracker-controller.c
index bfb766b..e3e85c4 100644
--- a/src/photos-tracker-controller.c
+++ b/src/photos-tracker-controller.c
@@ -283,7 +283,14 @@ photos_tracker_controller_refresh_internal (PhotosTrackerController *self, gint
     }
 
   if (!(flags & PHOTOS_TRACKER_REFRESH_FLAGS_DONT_SET_QUERY_STATUS))
-    photos_tracker_controller_set_query_status (self, TRUE);
+    {
+      PhotosBaseManager *item_mngr_chld;
+
+      photos_tracker_controller_set_query_status (self, TRUE);
+
+      item_mngr_chld = photos_item_manager_get_for_mode (PHOTOS_ITEM_MANAGER (priv->item_mngr), priv->mode);
+      photos_base_manager_clear (item_mngr_chld);
+    }
 
   photos_tracker_controller_perform_current_query (self);
 }
diff --git a/src/photos-view-model.c b/src/photos-view-model.c
index f331e59..cc78a31 100644
--- a/src/photos-view-model.c
+++ b/src/photos-view-model.c
@@ -232,43 +232,6 @@ photos_view_model_info_updated (PhotosBaseItem *item, gpointer user_data)
   GtkTreeIter iter;
   GtkTreePath *path;
   GtkTreeRowReference *row_ref;
-  PhotosBaseItem *active_collection;
-
-  g_return_if_fail (self->item_mngr != NULL);
-
-  active_collection = photos_item_manager_get_active_collection (PHOTOS_ITEM_MANAGER (self->item_mngr));
-  row_ref = (GtkTreeRowReference *) g_object_get_data (G_OBJECT (item), self->row_ref_key);
-
-  if (self->mode == PHOTOS_WINDOW_MODE_COLLECTIONS)
-    {
-      gboolean is_collection;
-
-      is_collection = photos_base_item_is_collection (item);
-      if (!is_collection && row_ref != NULL && active_collection == NULL)
-        photos_view_model_remove_item (self, item);
-      else if (is_collection  && row_ref == NULL && active_collection == NULL)
-        photos_view_model_add_item (self, item);
-    }
-  else if (self->mode == PHOTOS_WINDOW_MODE_FAVORITES)
-    {
-      gboolean is_favorite;
-
-      is_favorite = photos_base_item_is_favorite (item);
-      if (!is_favorite && row_ref != NULL && active_collection == NULL)
-        photos_view_model_remove_item (self, item);
-      else if (is_favorite  && row_ref == NULL && active_collection == NULL)
-        photos_view_model_add_item (self, item);
-    }
-  else if (self->mode == PHOTOS_WINDOW_MODE_OVERVIEW)
-    {
-      gboolean is_collection;
-
-      is_collection = photos_base_item_is_collection (item);
-      if (is_collection && row_ref != NULL)
-        photos_view_model_remove_item (self, item);
-      else if (!is_collection  && row_ref == NULL)
-        photos_view_model_add_item (self, item);
-    }
 
   row_ref = (GtkTreeRowReference *) g_object_get_data (G_OBJECT (item), self->row_ref_key);
   if (row_ref != NULL)
@@ -288,13 +251,8 @@ static void
 photos_view_model_object_added (PhotosViewModel *self, GObject *object)
 {
   PhotosBaseItem *item = PHOTOS_BASE_ITEM (object);
-  PhotosBaseItem *active_collection;
-  PhotosWindowMode mode;
   GtkTreeRowReference *row_ref;
-  gboolean is_collection;
-  gboolean is_favorite;
   const gchar *id;
-  gpointer data;
   guint info_updated_id;
 
   g_return_if_fail (self->item_mngr != NULL);
@@ -304,36 +262,15 @@ photos_view_model_object_added (PhotosViewModel *self, GObject *object)
   if (row_ref != NULL)
     return;
 
-  id = photos_filterable_get_id (PHOTOS_FILTERABLE (item));
-  data = g_hash_table_lookup (self->info_updated_ids, id);
-  if (data != NULL)
-    {
-      info_updated_id = GPOINTER_TO_UINT (data);
-      g_signal_handler_disconnect (item, (gulong) info_updated_id);
-      g_hash_table_remove (self->info_updated_ids, id);
-    }
-
-  active_collection = photos_item_manager_get_active_collection (PHOTOS_ITEM_MANAGER (self->item_mngr));
-  is_collection = photos_base_item_is_collection (item);
-  is_favorite = photos_base_item_is_favorite (item);
-  mode = photos_mode_controller_get_window_mode (self->mode_cntrlr);
-
-  if (active_collection == NULL || self->mode != mode)
-    {
-      if ((self->mode == PHOTOS_WINDOW_MODE_COLLECTIONS && !is_collection)
-          || (self->mode == PHOTOS_WINDOW_MODE_FAVORITES && !is_favorite)
-          || (self->mode == PHOTOS_WINDOW_MODE_OVERVIEW && is_collection))
-        goto out;
-    }
-
   photos_view_model_add_item (self, item);
 
- out:
   info_updated_id = (guint) g_signal_connect_object (item,
                                                      "info-updated",
                                                      G_CALLBACK (photos_view_model_info_updated),
                                                      self,
                                                      0);
+
+  id = photos_filterable_get_id (PHOTOS_FILTERABLE (item));
   g_hash_table_insert (self->info_updated_ids, g_strdup (id), GUINT_TO_POINTER (info_updated_id));
 }
 
@@ -360,19 +297,10 @@ photos_view_model_object_removed (PhotosViewModel *self, GObject *object)
 
 
 static void
-photos_view_model_query_status_changed (PhotosViewModel *self, gboolean query_status)
-{
-  if (query_status == FALSE)
-    return;
-
-  photos_view_model_clear (self);
-}
-
-
-static void
 photos_view_model_constructed (GObject *object)
 {
   PhotosViewModel *self = PHOTOS_VIEW_MODEL (object);
+  PhotosBaseManager *item_mngr_chld;
 
   G_OBJECT_CLASS (photos_view_model_parent_class)->constructed (object);
 
@@ -406,22 +334,18 @@ photos_view_model_constructed (GObject *object)
       break;
     }
 
-  g_signal_connect_object (self->item_mngr,
+  item_mngr_chld = photos_item_manager_get_for_mode (PHOTOS_ITEM_MANAGER (self->item_mngr), self->mode);
+  g_signal_connect_object (item_mngr_chld,
                            "object-added",
                            G_CALLBACK (photos_view_model_object_added),
                            self,
                            G_CONNECT_SWAPPED);
-  g_signal_connect_object (self->item_mngr,
+  g_signal_connect_object (item_mngr_chld,
                            "object-removed",
                            G_CALLBACK (photos_view_model_object_removed),
                            self,
                            G_CONNECT_SWAPPED);
-
-  g_signal_connect_object (self->trk_cntrlr,
-                           "query-status-changed",
-                           G_CALLBACK (photos_view_model_query_status_changed),
-                           self,
-                           G_CONNECT_SWAPPED);
+  g_signal_connect_object (item_mngr_chld, "clear", G_CALLBACK (photos_view_model_clear), self, 
G_CONNECT_SWAPPED);
 }