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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 parent-child relationship'''
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, QRegularExpression, QTimer, Qt
class TestObject1(QTimer):
def __init(self, parent):
super().__init__(parent)
class TestObject2(TestObject1):
def __init(self, parent):
super().__init__(parent)
class ParentRefCountCase(unittest.TestCase):
'''Test case for the refcount changes of setParent'''
def setUp(self):
# Acquire resources
self.parent = QObject()
self.child = QObject()
def tearDown(self):
# Release resources
del self.child
del self.parent
# PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
gc.collect()
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testSetParent(self):
# QObject.setParent() refcount changes
self.assertEqual(sys.getrefcount(self.child), 2)
self.child.setParent(self.parent)
self.assertEqual(sys.getrefcount(self.child), 3)
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testSetParentTwice(self):
self.assertEqual(sys.getrefcount(self.child), 2)
self.child.setParent(self.parent)
self.assertEqual(sys.getrefcount(self.child), 3)
self.child.setParent(self.parent)
self.assertEqual(sys.getrefcount(self.child), 3)
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testConstructor(self):
# QObject(QObject) refcount changes
child = QObject(self.parent)
self.assertEqual(sys.getrefcount(child), 3)
class ParentCase(unittest.TestCase):
'''Small collection of tests related to parent-child relationship'''
def testSetParent(self):
# QObject.setParent()
parent = QObject()
child = QObject()
child.setParent(parent)
self.assertEqual(parent, child.parent())
def testParentConstructor(self):
# QObject(parent)
parent = QObject()
child = QObject(parent)
self.assertEqual(parent, child.parent())
orig_repr = repr(child)
del child
# PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
gc.collect()
self.assertEqual(orig_repr, repr(parent.children()[0]))
def testChildren(self):
# QObject.children()
parent = QObject()
children = [QObject(parent) for x in range(25)]
self.assertEqual(parent.children(), children)
def testFindChild(self):
# QObject.findChild() with all QObject
parent = QObject()
children = [QObject(parent) for i in range(20)]
for i, child in enumerate(children):
child.setObjectName(f'object{i}')
for i, child in enumerate(children):
self.assertEqual(child, parent.findChild(QObject, f'object{i}'))
def testFindChildOptions(self):
parent = QObject()
child = QObject(parent)
nested_child_name = 'nestedChild'
nested_child = QObject(child)
nested_child.setObjectName(nested_child_name)
search_result = parent.findChild(QObject, nested_child_name)
self.assertTrue(search_result)
search_result = parent.findChild(QObject, nested_child_name,
Qt.FindChildrenRecursively)
self.assertTrue(search_result)
search_result = parent.findChild(QObject, nested_child_name,
Qt.FindDirectChildrenOnly)
self.assertFalse(search_result)
search_results = parent.findChildren(QObject, nested_child_name)
self.assertEqual(len(search_results), 1)
search_result = parent.findChildren(QObject, nested_child_name,
Qt.FindChildrenRecursively)
self.assertEqual(len(search_results), 1)
search_results = parent.findChildren(QObject, nested_child_name,
Qt.FindDirectChildrenOnly)
self.assertEqual(len(search_results), 0)
def testFindChildWithoutName(self):
parent = QObject()
children = [QObject(parent) for i in range(20)]
for i, child in enumerate(children):
child.setObjectName(f'object{i}')
child = parent.findChild(QObject)
self.assertTrue(isinstance(child, QObject))
def testFindChildren(self):
# QObject.findChildren() with all QObject
parent = QObject()
target_name = 'foo'
children = [QTimer(parent) for i in range(20)]
children.extend([QObject(parent) for i in range(20)])
for i, child in enumerate(children):
if i % 5 == 0:
child.setObjectName(target_name)
else:
child.setObjectName(str(i))
# Emulates findChildren with the intended outcome
target_children = [x for x in children if x.objectName() == target_name]
test_children = parent.findChildren(QObject, target_name)
self.assertEqual(target_children, test_children)
# test findChildren default value
res = parent.findChildren(QTimer)
self.assertEqual(len(res), 20)
# test findChildren with a QRegularExpression
res = parent.findChildren(QObject, QRegularExpression("^fo+"))
self.assertEqual(res, test_children)
def testParentEquality(self):
# QObject.parent() == parent
parent = QObject()
child = QObject(parent)
self.assertEqual(parent, child.parent())
def testFindChildByType(self):
parent = QObject()
expected = TestObject2(parent)
actual = parent.findChild(TestObject2)
self.assertEqual(actual, expected)
actual = parent.findChild(TestObject1)
self.assertEqual(actual, expected)
actual = parent.findChild(QTimer)
self.assertEqual(actual, expected)
def testFindChildrenByType(self):
parent = QObject()
expected = [TestObject2(parent)]
actual = parent.findChildren(TestObject2)
self.assertEqual(actual, expected)
actual = parent.findChildren(TestObject1)
self.assertEqual(actual, expected)
actual = parent.findChildren(QTimer)
self.assertEqual(actual, expected)
class TestParentOwnership(unittest.TestCase):
'''Test case for Parent/Child object ownership'''
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testParentDestructor(self):
parent = QObject()
self.assertEqual(sys.getrefcount(parent), 2)
child = QObject(parent)
self.assertEqual(sys.getrefcount(child), 3)
self.assertEqual(sys.getrefcount(parent), 2)
del parent
self.assertEqual(sys.getrefcount(child), 2)
# this will fail because parent deleted child cpp object
self.assertRaises(RuntimeError, lambda: child.objectName())
# test parent with multiples children
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testMultipleChildren(self):
o = QObject()
self.assertEqual(sys.getrefcount(o), 2)
c = QObject(o)
self.assertEqual(sys.getrefcount(c), 3)
self.assertEqual(sys.getrefcount(o), 2)
c2 = QObject(o)
self.assertEqual(sys.getrefcount(o), 2)
self.assertEqual(sys.getrefcount(c), 3)
self.assertEqual(sys.getrefcount(c2), 3)
del o
self.assertEqual(sys.getrefcount(c), 2)
self.assertEqual(sys.getrefcount(c2), 2)
# this will fail because parent deleted child cpp object
self.assertRaises(RuntimeError, lambda: c.objectName())
self.assertRaises(RuntimeError, lambda: c2.objectName())
# test recursive parent
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testRecursiveParent(self):
o = QObject()
self.assertEqual(sys.getrefcount(o), 2)
c = QObject(o)
self.assertEqual(sys.getrefcount(c), 3)
self.assertEqual(sys.getrefcount(o), 2)
c2 = QObject(c)
self.assertEqual(sys.getrefcount(o), 2)
self.assertEqual(sys.getrefcount(c), 3)
self.assertEqual(sys.getrefcount(c2), 3)
del o
self.assertEqual(sys.getrefcount(c), 2)
self.assertEqual(sys.getrefcount(c2), 2)
# this will fail because parent deleted child cpp object
self.assertRaises(RuntimeError, lambda: c.objectName())
self.assertRaises(RuntimeError, lambda: c2.objectName())
# test parent transfer
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testParentTransfer(self):
o = QObject()
self.assertEqual(sys.getrefcount(o), 2)
c = QObject()
self.assertEqual(sys.getrefcount(c), 2)
c.setParent(o)
self.assertEqual(sys.getrefcount(c), 3)
c.setParent(None)
self.assertEqual(sys.getrefcount(c), 2)
del c
del o
class ExtQObject(QObject):
def __init__(self):
super().__init__()
class ReparentingTest(unittest.TestCase):
'''Test cases for reparenting'''
def testParentedQObjectIdentity(self):
object_list = []
parent = QObject()
for i in range(3):
obj = QObject()
object_list.append(obj)
obj.setParent(parent)
for child in parent.children():
self.assertTrue(child in object_list)
def testParentedExtQObjectType(self):
object_list = []
parent = QObject()
for i in range(3):
obj = ExtQObject()
object_list.append(obj)
obj.setParent(parent)
for orig, child in zip(object_list, parent.children()):
self.assertEqual(type(orig), type(child))
def testReparentedQObjectIdentity(self):
object_list = []
old_parent = QObject()
new_parent = QObject()
for i in range(3):
obj = QObject()
object_list.append(obj)
obj.setParent(old_parent)
for obj in object_list:
obj.setParent(new_parent)
for child in new_parent.children():
self.assertTrue(child in object_list)
def testReparentedExtQObjectType(self):
object_list = []
old_parent = QObject()
new_parent = QObject()
for i in range(3):
obj = ExtQObject()
object_list.append(obj)
obj.setParent(old_parent)
for obj in object_list:
obj.setParent(new_parent)
for orig, child in zip(object_list, new_parent.children()):
self.assertEqual(type(orig), type(child))
if __name__ == '__main__':
unittest.main()
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