[gtk/wip/ebassi/constraint-layout] widget: Implement GtkConstraintTarget

[Emmanuele Bassi <ebassi src gnome org>]

commit 3a8c1abbc18a82f55f5eb725c549402a8f32a512
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jun 25 19:05:29 2019 +0000

    widget: Implement GtkConstraintTarget

 gtk/gtkwidget.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 6713213940..dd6e67dda7 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -73,6 +73,7 @@
 #include "gtkwindowgroup.h"
 #include "gtkwindowprivate.h"
 #include "gtknativeprivate.h"
+#include "gtkconstraint.h"
 
 #include "a11y/gtkwidgetaccessible.h"
 #include "inspector/window.h"
@@ -770,6 +771,13 @@ gtk_widget_get_type (void)
        NULL /* interface data */
       };
 
+      const GInterfaceInfo constraint_target_info =
+      {
+       (GInterfaceInitFunc) NULL,
+       (GInterfaceFinalizeFunc) NULL,
+       NULL /* interface data */
+      };
+
       widget_type = g_type_register_static (G_TYPE_INITIALLY_UNOWNED, g_intern_static_string ("GtkWidget"),
                                             &widget_info, G_TYPE_FLAG_ABSTRACT);
 
@@ -782,6 +790,8 @@ gtk_widget_get_type (void)
                                    &accessibility_info) ;
       g_type_add_interface_static (widget_type, GTK_TYPE_BUILDABLE,
                                    &buildable_info) ;
+      g_type_add_interface_static (widget_type, GTK_TYPE_CONSTRAINT_TARGET,
+                                   &constraint_target_info) ;
     }
 
   return widget_type;