Adds the @callback_symbol to the scope of @builder under the given @callback_name.
Using this function overrides the behavior of gtk_builder_connect_signals()
for any callback symbols that are added. Using this method allows for better
encapsulation as it does not require that callback symbols be declared in
the global namespace.
Adds the @callback_symbol to the scope of @builder under the given @callback_name.
Using this function overrides the behavior of gtk_builder_connect_signals() for any callback symbols that are added. Using this method allows for better encapsulation as it does not require that callback symbols be declared in the global namespace.