[gtk/wip/otte/listmodels: 6/18] selectionfiltermodel: Add ::item-type and ::n-items

[Benjamin Otte <otte src gnome org>]

commit 3e88a0a90adc9e42ef2107673626f5e056d948ab
Author: Benjamin Otte <otte redhat com>
Date:   Sat Jun 11 04:51:41 2022 +0200

    selectionfiltermodel: Add ::item-type and ::n-items

 gtk/gtkselectionfiltermodel.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
---
diff --git a/gtk/gtkselectionfiltermodel.c b/gtk/gtkselectionfiltermodel.c
index 3745721d82..dc7a48fab6 100644
--- a/gtk/gtkselectionfiltermodel.c
+++ b/gtk/gtkselectionfiltermodel.c
@@ -34,7 +34,10 @@
 
 enum {
   PROP_0,
+  PROP_ITEM_TYPE,
   PROP_MODEL,
+  PROP_N_ITEMS,
+
   NUM_PROPERTIES
 };
 
@@ -127,6 +130,8 @@ selection_filter_model_items_changed (GtkSelectionFilterModel *self,
 
   if (sel_removed > 0 || sel_added > 0)
     g_list_model_items_changed (G_LIST_MODEL (self), sel_position, sel_removed, sel_added);
+  if (sel_removed != sel_added)
+    g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_N_ITEMS]);
 }
 
 static void
@@ -178,10 +183,18 @@ gtk_selection_filter_model_get_property (GObject     *object,
 
   switch (prop_id)
     {
+    case PROP_ITEM_TYPE:
+      g_value_set_gtype (value, gtk_selection_filter_model_get_item_type (G_LIST_MODEL (self)));
+      break;
+
     case PROP_MODEL:
       g_value_set_object (value, self->model);
       break;
 
+    case PROP_N_ITEMS:
+      g_value_set_uint (value, gtk_selection_filter_model_get_n_items (G_LIST_MODEL (self)));
+      break;
+
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -220,6 +233,18 @@ gtk_selection_filter_model_class_init (GtkSelectionFilterModelClass *class)
   gobject_class->get_property = gtk_selection_filter_model_get_property;
   gobject_class->dispose = gtk_selection_filter_model_dispose;
 
+  /**
+   * GtkSelectionFilterModel:item-type:
+   *
+   * The type of items. See [func@Gio.ListModel.get_item_type].
+   *
+   * Since: 4.8
+   **/
+  properties[PROP_ITEM_TYPE] =
+    g_param_spec_gtype ("item-type", NULL, NULL,
+                        G_TYPE_OBJECT,
+                        G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+
   /**
    * GtkSelectionFilterModel:model: (attributes org.gtk.Property.get=gtk_selection_filter_model_get_model 
org.gtk.Property.set=gtk_selection_filter_model_set_model)
    *
@@ -230,6 +255,18 @@ gtk_selection_filter_model_class_init (GtkSelectionFilterModelClass *class)
                            GTK_TYPE_SELECTION_MODEL,
                            GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
 
+  /**
+   * GtkSelectionFilterModel:n-items:
+   *
+   * The number of items. See [func@Gio.ListModel.get_n_items].
+   *
+   * Since: 4.8
+   **/
+  properties[PROP_N_ITEMS] =
+    g_param_spec_uint ("n-items", NULL, NULL,
+                       0, G_MAXUINT, 0,
+                       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+
   g_object_class_install_properties (gobject_class, NUM_PROPERTIES, properties);
 }
 
@@ -300,6 +337,8 @@ gtk_selection_filter_model_set_model (GtkSelectionFilterModel *self,
 
   if (removed > 0 || added > 0)
     g_list_model_items_changed (G_LIST_MODEL (self), 0, removed, added);
+  if (removed != added)
+    g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_N_ITEMS]);
 
   g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODEL]);
 }