builder: Add GtkBuilderScope

GtkBuilderScope is an interface that provides the scope that a builder
instance operates in.
It creates closures and resolves types. Language bindings are meant to
use this interface to customize the behavior of builder files, in
particular when instantiating templates.

A default implementation for C is provided via GtkBuilderCScope (to keep
with the awkward naming that glib uses for closures). It is derivable on
purpose so that languages or extensions that extend C can use it.

The reftest code in fact does derive GtkBuilderCScope for its own scope
implementation that implements looking up symbols in modules.

gtk-widget-factory was updated to use the new GtkBuilderCScope to add
its custom callback symbols.
So it does it different from gtk-demo, which uses the normal way of
exporting symbols for dlsym() and thereby makes the 2 demos test the 2
ways GtkBuilder uses for looking up symbols.

1 files changed, 18 insertions, 12 deletions

diff --git a/demos/widget-factory/widget-factory.c b/demos/widget-factory/widget-factory.c
index 565383483c..94ddcfae68 100644
--- a/demos/widget-factory/widget-factory.c
+++ b/demos/widget-factory/widget-factory.c
@@ -1663,6 +1663,7 @@ static void
 activate (GApplication *app)
 {
   GtkBuilder *builder;
+  GtkBuilderScope *scope;
   GtkWindow *window;
   GtkWidget *widget;
   GtkWidget *widget2;
@@ -1716,18 +1717,23 @@ activate (GApplication *app)
   g_object_unref (provider);
 
   builder = gtk_builder_new ();
-  gtk_builder_add_callback_symbol (builder, "on_entry_icon_release", (GCallback)on_entry_icon_release);
-  gtk_builder_add_callback_symbol (builder, "on_scale_button_value_changed", (GCallback)on_scale_button_value_changed);
-  gtk_builder_add_callback_symbol (builder, "on_scale_button_query_tooltip", (GCallback)on_scale_button_query_tooltip);
-  gtk_builder_add_callback_symbol (builder, "on_record_button_toggled", (GCallback)on_record_button_toggled);
-  gtk_builder_add_callback_symbol (builder, "on_page_combo_changed", (GCallback)on_page_combo_changed);
-  gtk_builder_add_callback_symbol (builder, "on_range_from_changed", (GCallback)on_range_from_changed);
-  gtk_builder_add_callback_symbol (builder, "on_range_to_changed", (GCallback)on_range_to_changed);
-  gtk_builder_add_callback_symbol (builder, "tab_close_cb", (GCallback)tab_close_cb);
-  gtk_builder_add_callback_symbol (builder, "increase_icon_size", (GCallback)increase_icon_size);
-  gtk_builder_add_callback_symbol (builder, "decrease_icon_size", (GCallback)decrease_icon_size);
-  gtk_builder_add_callback_symbol (builder, "reset_icon_size", (GCallback)reset_icon_size);
-  gtk_builder_add_callback_symbol (builder, "osd_frame_pressed", (GCallback)osd_frame_pressed);
+  scope = gtk_builder_cscope_new ();
+  gtk_builder_cscope_add_callback_symbols (GTK_BUILDER_CSCOPE (scope),
+          "on_entry_icon_release", (GCallback)on_entry_icon_release,
+          "on_scale_button_value_changed", (GCallback)on_scale_button_value_changed,
+          "on_scale_button_query_tooltip", (GCallback)on_scale_button_query_tooltip,
+          "on_record_button_toggled", (GCallback)on_record_button_toggled,
+          "on_page_combo_changed", (GCallback)on_page_combo_changed,
+          "on_range_from_changed", (GCallback)on_range_from_changed,
+          "on_range_to_changed", (GCallback)on_range_to_changed,
+          "tab_close_cb", (GCallback)tab_close_cb,
+          "increase_icon_size", (GCallback)increase_icon_size,
+          "decrease_icon_size", (GCallback)decrease_icon_size,
+          "reset_icon_size", (GCallback)reset_icon_size,
+          "osd_frame_pressed", (GCallback)osd_frame_pressed,
+          NULL);
+  gtk_builder_set_scope (builder, scope);
+  g_object_unref (scope);
   gtk_builder_add_from_resource (builder, "/org/gtk/WidgetFactory4/widget-factory.ui", NULL);
 
   window = (GtkWindow *)gtk_builder_get_object (builder, "window");