[gtk/wip/ebassi/shortcut: 259/267] shortcutcontroller: Implement GtkBuildable

[Emmanuele Bassi <ebassi src gnome org>]

commit c4915d9fc37024b1877aa14bf29dfb74be6116df
Author: Benjamin Otte <otte redhat com>
Date:   Fri Aug 24 07:00:12 2018 +0200

    shortcutcontroller: Implement GtkBuildable
    
    Use it to allow adding shortcuts to the controller via the usual <child>
    method.

 gtk/gtkshortcutcontroller.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkshortcutcontroller.c b/gtk/gtkshortcutcontroller.c
index 756631fcd5..2c62dddd37 100644
--- a/gtk/gtkshortcutcontroller.c
+++ b/gtk/gtkshortcutcontroller.c
@@ -34,6 +34,7 @@
 
 #include "gtkshortcutcontrollerprivate.h"
 
+#include "gtkbuildable.h"
 #include "gtkconcatmodelprivate.h"
 #include "gtkeventcontrollerprivate.h"
 #include "gtkintl.h"
@@ -103,9 +104,37 @@ gtk_shortcut_controller_list_model_init (GListModelInterface *iface)
   iface->get_item = gtk_shortcut_controller_list_model_get_item;
 }
 
+static void
+gtk_shortcut_controller_buildable_add_child (GtkBuildable  *buildable,
+                                             GtkBuilder    *builder,
+                                             GObject       *child,
+                                             const gchar   *type)
+{
+  if (type != NULL)
+    {
+      GTK_BUILDER_WARN_INVALID_CHILD_TYPE (buildable, type);
+    }
+  if (GTK_IS_SHORTCUT (child))
+    {
+      gtk_shortcut_controller_add_shortcut (GTK_SHORTCUT_CONTROLLER (buildable), GTK_SHORTCUT (child));
+    }
+  else
+    {
+      g_warning ("Cannot add an object of type %s to a controller of type %s",
+                 g_type_name (G_OBJECT_TYPE (child)), g_type_name (G_OBJECT_TYPE (buildable)));
+    }
+}
+
+static void
+gtk_shortcut_controller_buildable_init (GtkBuildableIface *iface)
+{
+  iface->add_child = gtk_shortcut_controller_buildable_add_child;
+}
+
 G_DEFINE_TYPE_WITH_CODE (GtkShortcutController, gtk_shortcut_controller,
                          GTK_TYPE_EVENT_CONTROLLER,
-                         G_IMPLEMENT_INTERFACE (G_TYPE_LIST_MODEL, gtk_shortcut_controller_list_model_init))
+                         G_IMPLEMENT_INTERFACE (G_TYPE_LIST_MODEL, gtk_shortcut_controller_list_model_init)
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, gtk_shortcut_controller_buildable_init))
 
 static gboolean
 gtk_shortcut_controller_is_rooted (GtkShortcutController *self)