[gtk/wip/otte/listmodels: 4/17] singleselection: Add ::item-type and ::n-items

[Benjamin Otte <otte src gnome org>]

commit a357032169cc23cf2d8d93fbb8c4ac37fe012da9
Author: Benjamin Otte <otte redhat com>
Date:   Sat Jun 11 04:49:51 2022 +0200

    singleselection: Add ::item-type and ::n-items
    
    With tests!

 gtk/gtksingleselection.c        | 65 ++++++++++++++++++++++++++++++++---------
 testsuite/gtk/singleselection.c | 39 +++++++++++++++----------
 2 files changed, 76 insertions(+), 28 deletions(-)
---
diff --git a/gtk/gtksingleselection.c b/gtk/gtksingleselection.c
index 27d62845f9..3b6b0255b3 100644
--- a/gtk/gtksingleselection.c
+++ b/gtk/gtksingleselection.c
@@ -57,9 +57,11 @@ enum {
   PROP_0,
   PROP_AUTOSELECT,
   PROP_CAN_UNSELECT,
+  PROP_ITEM_TYPE,
+  PROP_MODEL,
+  PROP_N_ITEMS,
   PROP_SELECTED,
   PROP_SELECTED_ITEM,
-  PROP_MODEL,
   N_PROPS
 };
 
@@ -271,6 +273,8 @@ gtk_single_selection_items_changed_cb (GListModel         *model,
     }
 
   g_list_model_items_changed (G_LIST_MODEL (self), position, removed, added);
+  if (removed != added)
+    g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_N_ITEMS]);
 
   g_object_thaw_notify (G_OBJECT (self));
 }
@@ -337,10 +341,19 @@ gtk_single_selection_get_property (GObject    *object,
     case PROP_CAN_UNSELECT:
       g_value_set_boolean (value, self->can_unselect);
       break;
+
+    case PROP_ITEM_TYPE:
+      g_value_set_gtype (value, gtk_single_selection_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_single_selection_get_n_items (G_LIST_MODEL (self)));
+      break;
+
     case PROP_SELECTED:
       g_value_set_uint (value, self->selected);
       break;
@@ -397,6 +410,40 @@ gtk_single_selection_class_init (GtkSingleSelectionClass *klass)
                           FALSE,
                           G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
 
+  /**
+   * GtkSingleSelection: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);
+
+  /**
+   * GtkSingleSelection:model: (attributes org.gtk.Property.get=gtk_single_selection_get_model 
org.gtk.Property.set=gtk_single_selection_set_model)
+   *
+   * The model being managed.
+   */
+  properties[PROP_MODEL] =
+    g_param_spec_object ("model", NULL, NULL,
+                         G_TYPE_LIST_MODEL,
+                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+
+  /**
+   * GtkSingleSelection: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);
+
   /**
    * GtkSingleSelection:selected: (attributes org.gtk.Property.get=gtk_single_selection_get_selected 
org.gtk.Property.set=gtk_single_selection_set_selected)
    *
@@ -414,18 +461,8 @@ gtk_single_selection_class_init (GtkSingleSelectionClass *klass)
    */
   properties[PROP_SELECTED_ITEM] =
     g_param_spec_object ("selected-item", NULL, NULL,
-                       G_TYPE_OBJECT,
-                       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
-
-  /**
-   * GtkSingleSelection:model: (attributes org.gtk.Property.get=gtk_single_selection_get_model 
org.gtk.Property.set=gtk_single_selection_set_model)
-   *
-   * The model being managed.
-   */
-  properties[PROP_MODEL] =
-    g_param_spec_object ("model", NULL, NULL,
-                       G_TYPE_LIST_MODEL,
-                       G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+                         G_TYPE_OBJECT,
+                         G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
 
   g_object_class_install_properties (gobject_class, N_PROPS, properties);
 }
@@ -528,6 +565,8 @@ gtk_single_selection_set_model (GtkSingleSelection *self,
           g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_SELECTED_ITEM]);
         }
       g_list_model_items_changed (G_LIST_MODEL (self), 0, n_items_before, 0);
+      if (n_items_before)
+        g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_N_ITEMS]);
     }
 
   g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODEL]);
diff --git a/testsuite/gtk/singleselection.c b/testsuite/gtk/singleselection.c
index bb6462cd97..4465879d82 100644
--- a/testsuite/gtk/singleselection.c
+++ b/testsuite/gtk/singleselection.c
@@ -220,6 +220,14 @@ items_changed (GListModel *model,
     }
 }
 
+static void
+notify_n_items (GObject    *object,
+                GParamSpec *pspec,
+                GString    *changes)
+{
+  g_string_append_c (changes, '*');
+}
+
 static void
 selection_changed (GListModel *model,
                    guint       position,
@@ -265,6 +273,7 @@ new_model (GListStore *store, gboolean autoselect, gboolean can_unselect)
   changes = g_string_new ("");
   g_object_set_qdata_full (G_OBJECT(result), changes_quark, changes, free_changes);
   g_signal_connect (result, "items-changed", G_CALLBACK (items_changed), changes);
+  g_signal_connect (result, "notify::n-items", G_CALLBACK (notify_n_items), changes);
 
   changes = g_string_new ("");
   g_object_set_qdata_full (G_OBJECT(result), selection_quark, changes, free_changes);
@@ -336,19 +345,19 @@ test_changes (void)
 
   g_list_store_remove (store, 3);
   assert_model (selection, "1 2 3 5");
-  assert_changes (selection, "-3");
+  assert_changes (selection, "-3*");
   assert_selection (selection, "");
   assert_selection_changes (selection, "");
 
   insert (store, 3, 99);
   assert_model (selection, "1 2 3 99 5");
-  assert_changes (selection, "+3");
+  assert_changes (selection, "+3*");
   assert_selection (selection, "");
   assert_selection_changes (selection, "");
 
   splice (store, 3, 2, (guint[]) { 97 }, 1);
   assert_model (selection, "1 2 3 97");
-  assert_changes (selection, "3-2+1");
+  assert_changes (selection, "3-2+1*");
   assert_selection (selection, "");
   assert_selection_changes (selection, "");
 
@@ -434,31 +443,31 @@ test_autoselect (void)
 
   add (store, 1);
   assert_model (selection, "1");
-  assert_changes (selection, "+0");
+  assert_changes (selection, "+0*");
   assert_selection (selection, "1");
   assert_selection_changes (selection, "");
 
   splice (store, 0, 1, (guint[]) { 7, 8, 9 }, 3);
   assert_model (selection, "7 8 9");
-  assert_changes (selection, "0-1+3");
+  assert_changes (selection, "0-1+3*");
   assert_selection (selection, "7");
   assert_selection_changes (selection, "");
 
   splice (store, 0, 0, (guint[]) { 5, 6 }, 2);
   assert_model (selection, "5 6 7 8 9");
-  assert_changes (selection, "0+2");
+  assert_changes (selection, "0+2*");
   assert_selection (selection, "7");
   assert_selection_changes (selection, "");
 
   g_list_store_remove (store, 2);
   assert_model (selection, "5 6 8 9");
-  assert_changes (selection, "2-2+1");
+  assert_changes (selection, "2-2+1*");
   assert_selection (selection, "8");
   assert_selection_changes (selection, "");
 
   splice (store, 2, 2, NULL, 0);
   assert_model (selection, "5 6");
-  assert_changes (selection, "1-3+1");
+  assert_changes (selection, "1-3+1*");
   assert_selection (selection, "6");
   assert_selection_changes (selection, "");
 
@@ -470,13 +479,13 @@ test_autoselect (void)
 
   g_list_store_remove (store, 0);
   assert_model (selection, "2");
-  assert_changes (selection, "-0");
+  assert_changes (selection, "-0*");
   assert_selection (selection, "2");
   assert_selection_changes (selection, "");
 
   g_list_store_remove (store, 0);
   assert_model (selection, "");
-  assert_changes (selection, "-0");
+  assert_changes (selection, "-0*");
   assert_selection (selection, "");
   assert_selection_changes (selection, "");
 
@@ -671,24 +680,24 @@ test_set_model (void)
 
   /* we retain the selected item across model changes */
   gtk_single_selection_set_model (GTK_SINGLE_SELECTION (selection), m2);
-  assert_changes (selection, "0-5+3");
+  assert_changes (selection, "0-5+3*");
   assert_selection (selection, "1");
   assert_selection_changes (selection, "");
 
   gtk_single_selection_set_model (GTK_SINGLE_SELECTION (selection), NULL);
-  assert_changes (selection, "0-3");
+  assert_changes (selection, "0-3*");
   assert_selection (selection, "");
   assert_selection_changes (selection, "");
 
   gtk_single_selection_set_autoselect (GTK_SINGLE_SELECTION (selection), FALSE);
   gtk_single_selection_set_model (GTK_SINGLE_SELECTION (selection), m2);
-  assert_changes (selection, "0+3");
+  assert_changes (selection, "0+3*");
   assert_selection (selection, "");
   assert_selection_changes (selection, "");
 
   /* we retain no selected item across model changes */
   gtk_single_selection_set_model (GTK_SINGLE_SELECTION (selection), m1);
-  assert_changes (selection, "0-3+5");
+  assert_changes (selection, "0-3+5*");
   assert_selection (selection, "");
   assert_selection_changes (selection, "");
 
@@ -697,7 +706,7 @@ test_set_model (void)
   assert_selection_changes (selection, "4:1");
 
   gtk_single_selection_set_model (GTK_SINGLE_SELECTION (selection), m2);
-  assert_changes (selection, "0-5+3");
+  assert_changes (selection, "0-5+3*");
   assert_selection (selection, "");
   assert_selection_changes (selection, "");