overrides: Make value argument to Container.child_get_property optional

Override Gtk.Container.child_get_property to optionally accept the "value"
argument. If "value" is not supplied, the override will locate the child
property value type and create the GValue. Additionally return the resulting
GValue converted to a native Python value.

https://bugzilla.gnome.org/show_bug.cgi?id=685076

1 files changed, 11 insertions, 0 deletions

diff --git a/gi/overrides/Gtk.py b/gi/overrides/Gtk.py
index bd3d42a0..060798b1 100644
--- a/gi/overrides/Gtk.py
+++ b/gi/overrides/Gtk.py
@@ -110,6 +110,17 @@ class Container(Gtk.Container, Widget):
 
     get_focus_chain = strip_boolean_result(Gtk.Container.get_focus_chain)
 
+    def child_get_property(self, child, property_name, value=None):
+        if value is None:
+            prop = self.find_child_property(property_name)
+            if prop is None:
+                raise ValueError('Class "%s" does not contain child property "%s"' %
+                                 (self, property_name))
+            value = GObject.Value(prop.value_type)
+
+        Gtk.Container.child_get_property(self, child, property_name, value)
+        return value.get_value()
+
 
 Container = override(Container)
 __all__.append('Container')