[gtk+/a11y] API: Add gtk_widget_class_set_accessible_type()

[Benjamin Otte <otte src gnome org>]

commit 99af8e0e95e7b7eb33c5d125b18b1ef1910bca5b
Author: Benjamin Otte <otte redhat com>
Date:   Sat Jun 18 09:51:18 2011 +0200

    API: Add gtk_widget_class_set_accessible_type()
    
    The function is supposed to bypass the ATK registry. For 2 reasons:
    1) We get rid of a lot of boilerplate madness.
    2) The registry allows creating multiple accessibles per widget and we
       don't.
    
    The old code for registries is still there.

 docs/reference/gtk/gtk3-sections.txt |    1 +
 gtk/gtk.symbols                      |    1 +
 gtk/gtkwidget.c                      |   54 +++++++++++++++++++++++++++++----
 gtk/gtkwidget.h                      |    2 +
 4 files changed, 51 insertions(+), 7 deletions(-)
---
diff --git a/docs/reference/gtk/gtk3-sections.txt b/docs/reference/gtk/gtk3-sections.txt
index f0654c3..0ec7c15 100644
--- a/docs/reference/gtk/gtk3-sections.txt
+++ b/docs/reference/gtk/gtk3-sections.txt
@@ -5050,6 +5050,7 @@ gtk_widget_style_get
 gtk_widget_style_get_property
 gtk_widget_style_get_valist
 gtk_widget_style_attach
+gtk_widget_class_set_accessible_type
 gtk_widget_get_accessible
 gtk_widget_child_focus
 gtk_widget_child_notify
diff --git a/gtk/gtk.symbols b/gtk/gtk.symbols
index cde5ce5..5bac657 100644
--- a/gtk/gtk.symbols
+++ b/gtk/gtk.symbols
@@ -3462,6 +3462,7 @@ gtk_widget_class_install_style_property
 gtk_widget_class_install_style_property_parser
 gtk_widget_class_list_style_properties
 gtk_widget_class_path
+gtk_widget_class_set_accessible_type
 gtk_widget_compute_expand
 gtk_widget_create_pango_context
 gtk_widget_create_pango_layout
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 535a5a9..5c3ca8b 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -409,7 +409,7 @@ struct _GtkWidgetPrivate
 
 struct _GtkWidgetClassPrivate
 {
-  int dummy;
+  GType accessible_type;
 };
 
 enum {
@@ -939,6 +939,7 @@ gtk_widget_class_init (GtkWidgetClass *klass)
   klass->show_help = gtk_widget_real_show_help;
 
   /* Accessibility support */
+  klass->priv->accessible_type = GTK_TYPE_ACCESSIBLE;
   klass->get_accessible = gtk_widget_real_get_accessible;
 
   klass->adjust_size_request = gtk_widget_real_adjust_size_request;
@@ -11918,6 +11919,33 @@ G_DEFINE_BOXED_TYPE (GtkRequisition, gtk_requisition,
                      gtk_requisition_free)
 
 /**
+ * gtk_widget_class_set_accessible_type:
+ * @widget_class: class to set the accessible type for
+ * @type: The object type that implements the accessible for @widget_class
+ *
+ * Sets the type to be used for creating accessibles for widgets of
+ * @widget_class. The given @type must be a subtype of the type used for
+ * accessibles of the parent class.
+ *
+ * This function should only be called from class init functions of widgets.
+ *
+ * Since: 3.2
+ **/
+void
+gtk_widget_class_set_accessible_type (GtkWidgetClass *widget_class,
+                                      GType           type)
+{
+  GtkWidgetClassPrivate *priv;
+
+  g_return_if_fail (GTK_IS_WIDGET_CLASS (widget_class));
+  g_return_if_fail (g_type_is_a (type, widget_class->priv->accessible_type));
+
+  priv = widget_class->priv;
+
+  priv->accessible_type = type;
+}
+
+/**
  * gtk_widget_get_accessible:
  * @widget: a #GtkWidget
  *
@@ -11960,15 +11988,27 @@ gtk_widget_real_get_accessible (GtkWidget *widget)
                                    quark_accessible_object);
   if (!accessible)
   {
+    GtkWidgetClass *widget_class;
     AtkObjectFactory *factory;
     AtkRegistry *default_registry;
 
-    default_registry = atk_get_default_registry ();
-    factory = atk_registry_get_factory (default_registry,
-                                        G_TYPE_FROM_INSTANCE (widget));
-    accessible =
-      atk_object_factory_create_accessible (factory,
-					    G_OBJECT (widget));
+    widget_class = GTK_WIDGET_GET_CLASS (widget);
+
+    if (widget_class->priv->accessible_type == GTK_TYPE_ACCESSIBLE)
+      {
+        default_registry = atk_get_default_registry ();
+        factory = atk_registry_get_factory (default_registry,
+                                            G_TYPE_FROM_INSTANCE (widget));
+        accessible =
+          atk_object_factory_create_accessible (factory,
+                                                G_OBJECT (widget));
+      }
+    else
+      {
+        accessible = g_object_new (widget_class->priv->accessible_type, NULL);
+        atk_object_initialize (accessible, widget);
+      }
+
     g_object_set_qdata (G_OBJECT (widget),
                         quark_accessible_object,
                         accessible);
diff --git a/gtk/gtkwidget.h b/gtk/gtkwidget.h
index 09d8a8e..8aa1e1f 100644
--- a/gtk/gtkwidget.h
+++ b/gtk/gtkwidget.h
@@ -722,6 +722,8 @@ void             gtk_widget_set_support_multidevice (GtkWidget      *widget,
                                                      gboolean        support_multidevice);
 
 /* Accessibility support */
+void             gtk_widget_class_set_accessible_type    (GtkWidgetClass     *widget_class,
+                                                          GType               type);
 AtkObject*       gtk_widget_get_accessible               (GtkWidget          *widget);