GtkBuilderWidget: Remove '_builder_expose' kwarg, add '_gtk_properties'

The '_builder_expose' argument to GtkBuilderWidget.__init__() allowed
binding of names in the ui-file to objects defined outside of the
ui-file.

Glade does not allow setting properties to values which are not defined
in the ui-file, so we set GTK/Gobject properties explicitly. This is
made with a new kwarg '_gtk_properties' in GtkBuilderWidget.__init__()
which is a dict with a (object_id, property_name) key.

src/gpodder/gtkui/base.py

@@ -50,9 +50,6 @@ class GtkBuilderWidget(object):
         if parent is not None:
             self.builder.expose_object('parent_widget', parent)
         self.builder.set_translation_domain(textdomain)
-        if hasattr(self, '_builder_expose'):
-            for (key, value) in list(self._builder_expose.items()):
-                self.builder.expose_object(key, value)
 
         # print >>sys.stderr, 'Creating new from file', self.__class__.__name__
 
@@ -67,6 +64,9 @@ class GtkBuilderWidget(object):
 
         self.builder.connect_signals(self)
         self.set_attributes()
+        if hasattr(self, '_gtk_properties'):
+            for ((gobj, prop), val) in self._gtk_properties.items():
+                getattr(self, gobj).set_property(prop, val)
 
         self.new()
 

src/gpodder/gtkui/main.py

@@ -89,7 +89,8 @@ class gPodder(BuilderWidget, dbus.service.Object):
         self.extensions_actions = []
         self._search_podcasts = None
         self._search_episodes = None
-        BuilderWidget.__init__(self, None, _builder_expose={'app': app})
+        BuilderWidget.__init__(self, None,
+            _gtk_properties={('gPodder', 'application'): app})
 
         self.last_episode_date_refresh = None
         self.refresh_episode_dates()