[pygobject] Container should be iterable.

[Ignacio Casal Quinteiro <icq src gnome org>]

commit f4f7fb35af1b41598dc050f5df155a01c370a920
Author: Dmitry Morozov <dmitry a morozov yandex ru>
Date:   Sat Dec 4 19:19:19 2010 +0600

    Container should be iterable.

 gi/overrides/Gtk.py     |    9 +++++++++
 tests/test_overrides.py |    6 +++++-
 2 files changed, 14 insertions(+), 1 deletions(-)
---
diff --git a/gi/overrides/Gtk.py b/gi/overrides/Gtk.py
index 1509fd8..c8233e7 100644
--- a/gi/overrides/Gtk.py
+++ b/gi/overrides/Gtk.py
@@ -54,6 +54,15 @@ class Container(Gtk.Container, Widget):
     def __contains__(self, child):
         return child in self.get_children()
 
+    def __iter__(self):
+        return iter(self.get_children())
+
+    def __bool__(self):
+        return True
+
+    # alias for Python 2.x object protocol
+    __nonzero__ = __bool__
+
     def get_focus_chain(self):
         success, widgets = super(Container, self).get_focus_chain()
         if success:
diff --git a/tests/test_overrides.py b/tests/test_overrides.py
index e7e0632..45be0b8 100644
--- a/tests/test_overrides.py
+++ b/tests/test_overrides.py
@@ -59,13 +59,17 @@ class TestGtk(unittest.TestCase):
 
     def test_container(self):
         box = Gtk.Box()
+        self.assertTrue(box)
         label = Gtk.Label()
         label2 = Gtk.Label()
         box.add(label)
         box.add(label2)
         self.assertTrue(label in box)
         self.assertTrue(label2 in box)
-        self.assertEqual(len(box),2)
+        self.assertEqual(len(box), 2)
+        self.assertTrue(box)
+        l = [x for x in box]
+        self.assertEqual(l, [label, label2])
 
     def test_actiongroup(self):
         self.assertEquals(Gtk.ActionGroup, overrides.Gtk.ActionGroup)