[gtk/popover-menu-custom-child] popovermenu: Allow adding custom items in ui files



commit b46fbb14bab452c1a4914be04a960fc13101372d
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Oct 26 13:21:28 2020 -0400

    popovermenu: Allow adding custom items in ui files
    
    Support <child type="ID"> to fill custom child slots.

 gtk/gtkpopovermenu.c | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkpopovermenu.c b/gtk/gtkpopovermenu.c
index cd54fe600d..44b7e6d57a 100644
--- a/gtk/gtkpopovermenu.c
+++ b/gtk/gtkpopovermenu.c
@@ -35,6 +35,7 @@
 #include "gtkpopovermenubar.h"
 #include "gtkshortcutmanager.h"
 #include "gtkshortcutcontroller.h"
+#include "gtkbuildable.h"
 
 
 /**
@@ -149,7 +150,11 @@ enum {
   PROP_MENU_MODEL
 };
 
-G_DEFINE_TYPE (GtkPopoverMenu, gtk_popover_menu, GTK_TYPE_POPOVER)
+static void gtk_popover_menu_buildable_iface_init (GtkBuildableIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (GtkPopoverMenu, gtk_popover_menu, GTK_TYPE_POPOVER,
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
+                                                gtk_popover_menu_buildable_iface_init))
 
 GtkWidget *
 gtk_popover_menu_get_parent_menu (GtkPopoverMenu *menu)
@@ -549,6 +554,31 @@ gtk_popover_menu_class_init (GtkPopoverMenuClass *klass)
                                        "activate-default", NULL);
 }
 
+static GtkBuildableIface *parent_buildable_iface;
+
+static void
+gtk_popover_menu_buildable_add_child (GtkBuildable *buildable,
+                                      GtkBuilder   *builder,
+                                      GObject      *child,
+                                      const char   *type)
+{
+  if (GTK_IS_WIDGET (child))
+    {
+      if (!gtk_popover_menu_add_child (GTK_POPOVER_MENU (buildable), GTK_WIDGET (child), type))
+        g_warning ("No such custom attribute: %s", type);
+    }
+  else
+    parent_buildable_iface->add_child (buildable, builder, child, type);
+}
+
+static void
+gtk_popover_menu_buildable_iface_init (GtkBuildableIface *iface)
+{
+  parent_buildable_iface = g_type_interface_peek_parent (iface);
+
+  iface->add_child = gtk_popover_menu_buildable_add_child;
+}
+
 /**
  * gtk_popover_menu_new:
  *


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