add an example of a bin that overrides the change_state vmethod

Original commit message from CVS:
add an example of a bin that overrides the change_state vmethod

ChangeLog

@@ -1,3 +1,9 @@
+2005-09-01  Thomas Vander Stichele  <thomas at apestaart dot org>
+
+	* testsuite/Makefile.am:
+	* testsuite/test_bin.py:
+	  add an example of a bin that overrides the change_state vmethod
+
 2005-09-01  Thomas Vander Stichele  <thomas at apestaart dot org>
 
 	* testsuite/Makefile.am:

testsuite/Makefile.am

@@ -18,6 +18,7 @@ testhelper.la: $(testhelper_la_OBJECTS) $(testhelper_la_DEPENDENCIES)
 	$(LINK) -rpath $(pkgpyexecdir) $(testhelper_la_LDFLAGS) $(testhelper_la_OBJECTS) $(testhelper_la_LIBADD) $(LIBS)
 
 tests =  \
+	test_bin.py \
 	test_buffer.py \
         test_caps.py \
 	test_element.py \

testsuite/test_bin.py

@@ -0,0 +1,53 @@
+# -*- Mode: Python -*-
+# vi:si:et:sw=4:sts=4:ts=4
+#
+# gst-python - Python bindings for GStreamer
+# Copyright (C) 2002 David I. Lehn
+# Copyright (C) 2004 Johan Dahlin
+# Copyright (C) 2005 Edward Hervey
+# Copyright (C) 2005 Thomas Vander Stichele
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+
+from common import gobject, gst, unittest
+
+# see
+# http://www.sicem.biz/personal/lgs/docs/gobject-python/gobject-tutorial.html
+class MyBin(gst.Bin):
+    _state_changed = False
+
+    def __init__(self, name):
+        # we need to call GObject's init to be able to do self.do_*
+        gobject.GObject.__init__(self)
+        # since we can't chain up to our parent's __init__, we set the
+        # name manually 
+        self.set_property('name', name)
+
+    def do_change_state(self):
+        self._state_changed = True
+        # chain up to parent
+        return gst.Bin.do_change_state(self)
+# we need to register the type for PyGTK < 2.8
+gobject.type_register(MyBin)
+
+class BinSubclassTest(unittest.TestCase):
+    def testStateChange(self):
+        bin = MyBin("mybin")
+        self.assertEquals(bin.get_name(), "mybin")
+        bin.set_state(gst.STATE_PLAYING)
+        self.failUnless(bin._state_changed)
+
+if __name__ == "__main__":
+    unittest.main()