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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
'''Test cases for QObject methods'''
import gc
import os
import sys
import unittest
from pathlib import Path
sys.path.append(os.fspath(Path(__file__).resolve().parents[1]))
from init_paths import init_test_paths
init_test_paths(False)
from PySide6.QtCore import QObject, QTimer
from PySide6.QtWidgets import QApplication, QLabel, QVBoxLayout
is_alive = None
class InheritsCase(unittest.TestCase):
'''Test case for QObject.inherits'''
def testCppInheritance(self):
# QObject.inherits() for c++ classes
# A class inherits itself
self.assertTrue(QObject().inherits('QObject'))
def testPythonInheritance(self):
# QObject.inherits() for python classes
class Dummy(QObject):
# Dummy class
pass
self.assertTrue(Dummy().inherits('QObject'))
self.assertTrue(Dummy().inherits('Dummy'))
self.assertTrue(not Dummy().inherits('FooBar'))
def testPythonMultiInheritance(self):
# QObject.inherits() for multiple inheritance
# QObject.inherits(classname) should fail if classname isn't a
# QObject subclass
class Parent(object):
# Dummy parent
pass
class Dummy(QObject, Parent):
# Dummy class
pass
self.assertTrue(Dummy().inherits('QObject'))
self.assertTrue(not Dummy().inherits('Parent'))
def testSetAttributeBeforeCallingInitOnQObjectDerived(self):
'''Test for bug #428.'''
class DerivedObject(QObject):
def __init__(self):
self.member = 'member'
super().__init__()
obj0 = DerivedObject()
# The second instantiation of DerivedObject will generate an exception
# that will not come to surface immediately.
obj1 = DerivedObject()
# The mere calling of the object method causes
# the exception to "reach the surface".
obj1.objectName()
def testMultipleInheritance(self):
def declareClass():
class Foo(object, QObject):
pass
self.assertRaises(TypeError, declareClass)
# PYSIDE-11:
# The takeOwnership() method was relying that the SbkObject
# had a converter, which it's not the case when multiple
# inheritance is used.
# The deleteLater() method uses the takeOwnership() to give
# control of the object to C++, so it can be remove once
# the destructor is called.
# The solution was to add a default case when the object
# is null under the pythonTypeIsValueType() method in shiboken.
def testDeleteMultipleInheritance(self):
app = QApplication(sys.argv)
class DerivedLabel(QLabel, QObject):
def __del__(self):
global is_alive
is_alive = False
global is_alive
child = DerivedLabel('Hello')
is_alive = True
parent = QVBoxLayout()
parent.addWidget(child)
parent.removeWidget(child)
child.deleteLater()
self.assertTrue(is_alive)
del child
# PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
gc.collect()
self.assertTrue(is_alive)
QTimer.singleShot(100, app.quit)
app.exec()
# PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
gc.collect()
self.assertFalse(is_alive)
if __name__ == '__main__':
unittest.main()
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