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#############################################################################
##
## Copyright (C) 2016 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the test suite of Qt for Python.
##
## $QT_BEGIN_LICENSE:GPL-EXCEPT$
## Commercial License Usage
## Licensees holding valid commercial Qt licenses may use this file in
## accordance with the commercial license agreement provided with the
## Software or, alternatively, in accordance with the terms contained in
## a written agreement between you and The Qt Company. For licensing terms
## and conditions see https://www.qt.io/terms-conditions. For further
## information use the contact form at https://www.qt.io/contact-us.
##
## GNU General Public License Usage
## Alternatively, this file may be used under the terms of the GNU
## General Public License version 3 as published by the Free Software
## Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
## included in the packaging of this file. Please review the following
## information to ensure the GNU General Public License requirements will
## be met: https://www.gnu.org/licenses/gpl-3.0.html.
##
## $QT_END_LICENSE$
##
#############################################################################
'''Test cases for QLayout handling of child widgets references'''
import os
import sys
from sys import getrefcount
import unittest
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from init_paths import init_test_paths
init_test_paths(False)
from PySide2.QtWidgets import QHBoxLayout, QVBoxLayout, QGridLayout, QWidget
from PySide2.QtWidgets import QStackedLayout, QFormLayout
from PySide2.QtWidgets import QApplication, QPushButton, QLabel
from helper.usesqapplication 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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