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'''Test cases for Reference count when the object is created in c++ side'''
import unittest
import sys
import weakref
import gc
from PySide.QtCore import Qt, QPointF
from PySide.QtGui import QApplication, QGraphicsScene, QGraphicsRectItem, QPolygonF, QGraphicsPolygonItem, QGraphicsRectItem
from helper import UsesQApplication
destroyedRect = False
destroyedPol = False
def rect_del(o):
global destroyedRect
destroyedRect = True
def pol_del(o):
global destroyedPol
destroyedPol = True
class ReferenceCount(UsesQApplication):
def setUp(self):
super(ReferenceCount, self).setUp()
self.scene = QGraphicsScene()
def tearDown(self):
super(ReferenceCount, self).tearDown()
def beforeTest(self):
points = [QPointF(0, 0), QPointF(100, 100), QPointF(0, 100)]
pol = self.scene.addPolygon(QPolygonF(points))
self.assert_(isinstance(pol, QGraphicsPolygonItem))
self.wrp = weakref.ref(pol, pol_del)
#refcount need be 3 because one ref for QGraphicsScene, and one to rect obj
self.assertEqual(sys.getrefcount(pol), 3)
def testReferenceCount(self):
global destroyedRect
global destroyedPol
self.beforeTest()
rect = self.scene.addRect(10.0, 10.0, 10.0, 10.0)
self.assert_(isinstance(rect, QGraphicsRectItem))
self.wrr = weakref.ref(rect, rect_del)
#refcount need be 3 because one ref for QGraphicsScene, and one to rect obj
self.assertEqual(sys.getrefcount(rect), 3)
del rect
#not destroyed because one ref continue in QGraphicsScene
self.assertEqual(destroyedRect, False)
self.assertEqual(destroyedPol, False)
del self.scene
#QGraphicsScene was destroyed and this destroy internal ref to rect
self.assertEqual(destroyedRect, True)
self.assertEqual(destroyedPol, True)
if __name__ == '__main__':
unittest.main()
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