[gtk/constraint-flexible-space: 2/5] widget: Implement GtkConstraintTarget

[Matthias Clasen <matthiasc src gnome org>]

commit e2cad3775e05479bb82f82cd5c5f25d06ca95a7a
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 5568015d59..a4baaad3e1 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"
@@ -769,6 +770,13 @@ 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);
 
@@ -781,6 +789,8 @@ 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;