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'''Test cases for QLayout handling of child widgets references'''
import unittest
from sys import getrefcount
from PySide.QtGui import QHBoxLayout, QVBoxLayout, QGridLayout, QWidget
from PySide.QtGui import QStackedLayout, QFormLayout
from PySide.QtGui import QApplication, QPushButton, QLabel
from helper import UsesQApplication
class SaveReference(UsesQApplication):
'''Test case to check if QLayout-derived classes increment the refcount
of widgets passed to addWidget()'''
# Adding here as nose can't see the qapplication attrib we inherit
qapplication = True
def setUp(self):
#Acquire resources
super(SaveReference, self).setUp()
self.widget1 = QPushButton('click me')
self.widget2 = QLabel('aaa')
def tearDown(self):
#Release resources
del self.widget2
del self.widget1
super(SaveReference, self).tearDown()
def checkLayoutReference(self, layout):
#Checks the reference cound handling of layout.addWidget
self.assertEqual(getrefcount(self.widget1), 2)
layout.addWidget(self.widget1)
self.assertEqual(getrefcount(self.widget1), 3)
self.assertEqual(getrefcount(self.widget2), 2)
layout.addWidget(self.widget2)
self.assertEqual(getrefcount(self.widget2), 3)
# Check if doesn't mess around with previous widget refcount
self.assertEqual(getrefcount(self.widget1), 3)
def testMoveLayout(self):
l = QHBoxLayout()
self.assertEqual(getrefcount(self.widget1), 2)
l.addWidget(self.widget1)
self.assertEqual(getrefcount(self.widget1), 3)
w = QWidget()
w.setLayout(l)
self.assertEqual(getrefcount(self.widget1), 3)
def testHBoxReference(self):
#QHBoxLayout.addWidget reference count
w = QWidget()
self.checkLayoutReference(QHBoxLayout(w))
def testVBoxReference(self):
#QVBoxLayout.addWidget reference count
w = QWidget()
self.checkLayoutReference(QVBoxLayout(w))
def testGridReference(self):
#QGridLayout.addWidget reference count
w = QWidget()
self.checkLayoutReference(QGridLayout(w))
def testFormReference(self):
#QFormLayout.addWidget reference count
w = QWidget()
self.checkLayoutReference(QFormLayout(w))
def testStackedReference(self):
#QStackedLayout.addWidget reference count
w = QWidget()
self.checkLayoutReference(QStackedLayout(w))
class MultipleAdd(UsesQApplication):
'''Test case to check if refcount is incremented only once when multiple
calls to addWidget are made with the same widget'''
qapplication = True
def setUp(self):
#Acquire resources
super(MultipleAdd, self).setUp()
self.widget = QPushButton('click me')
self.win = QWidget()
self.layout = QHBoxLayout(self.win)
def tearDown(self):
#Release resources
del self.widget
del self.layout
del self.win
super(MultipleAdd, self).tearDown()
def testRefCount(self):
#Multiple QLayout.addWidget calls on the same widget
self.assertEqual(getrefcount(self.widget), 2)
self.layout.addWidget(self.widget)
self.assertEqual(getrefcount(self.widget), 3)
self.layout.addWidget(self.widget)
self.assertEqual(getrefcount(self.widget), 3)
self.layout.addWidget(self.widget)
self.assertEqual(getrefcount(self.widget), 3)
class InternalAdd(UsesQApplication):
def testInternalRef(self):
mw = QWidget()
w = QWidget()
ow = QWidget()
topLayout = QGridLayout()
# unique reference
self.assertEqual(getrefcount(w), 2)
self.assertEqual(getrefcount(ow), 2)
topLayout.addWidget(w, 0, 0)
topLayout.addWidget(ow, 1, 0)
# layout keep the referemce
self.assertEqual(getrefcount(w), 3)
self.assertEqual(getrefcount(ow), 3)
mainLayout = QGridLayout()
mainLayout.addLayout(topLayout, 1, 0, 1, 4)
# the same reference
self.assertEqual(getrefcount(w), 3)
self.assertEqual(getrefcount(ow), 3)
mw.setLayout(mainLayout)
# now trasfer the ownership to mw
self.assertEqual(getrefcount(w), 3)
self.assertEqual(getrefcount(ow), 3)
del mw
# remove the ref and invalidate the widget
self.assertEqual(getrefcount(w), 2)
self.assertEqual(getrefcount(ow), 2)
if __name__ == '__main__':
unittest.main()
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