Created DestroyListener class.

This class is used to keep the Python object live until the signal destroyed emission.

With this is possible to use the QObject on destruction signal.

Fixes bug #505.

Reviewer: Marcelo Lira <marcelo.lira@openbossa.org>
          Hugo Parente Lima <hugo.pl@gmail.com>

tests/QtCore/CMakeLists.txt

@@ -21,6 +21,7 @@ PYSIDE_TEST(classinfo_test.py)
 PYSIDE_TEST(child_event_test.py)
 PYSIDE_TEST(deepcopy_test.py)
 PYSIDE_TEST(deletelater_test.py)
+PYSIDE_TEST(destroysignal_test.py)
 PYSIDE_TEST(duck_punching_test.py)
 PYSIDE_TEST(hash_test.py)
 PYSIDE_TEST(max_signals.py)

tests/QtCore/destroysignal_test.py

@@ -0,0 +1,27 @@
+from PySide.QtCore import QTimer, QObject
+import sys
+import unittest
+
+class TestDestroySignal(unittest.TestCase):
+    def onObjectDestroyed(self, timer):
+        self.assert_(isinstance(timer, QTimer))
+        self._destroyed = True
+
+    def testSignal(self):
+        self._destroyed = False
+        t = QTimer()
+        t.destroyed[QObject].connect(self.onObjectDestroyed)
+        del t
+        self.assert_(self._destroyed)
+
+    def testWithParent(self):
+        self._destroyed = False
+        p = QTimer()
+        t = QTimer(p)
+        t.destroyed[QObject].connect(self.onObjectDestroyed)
+        del p
+        self.assert_(self._destroyed)
+
+if __name__ == '__main__':
+    unittest.main()
+