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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 QLayout handling of child widgets references'''
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.QtWidgets import QHBoxLayout, QVBoxLayout, QGridLayout, QWidget
from PySide6.QtWidgets import QStackedLayout, QFormLayout
from PySide6.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
# PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
gc.collect()
super(SaveReference, self).tearDown()
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def checkLayoutReference(self, layout):
# Checks the reference cound handling of layout.addWidget
self.assertEqual(sys.getrefcount(self.widget1), 2)
layout.addWidget(self.widget1)
self.assertEqual(sys.getrefcount(self.widget1), 3)
self.assertEqual(sys.getrefcount(self.widget2), 2)
layout.addWidget(self.widget2)
self.assertEqual(sys.getrefcount(self.widget2), 3)
# Check if doesn't mess around with previous widget refcount
self.assertEqual(sys.getrefcount(self.widget1), 3)
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testMoveLayout(self):
l = QHBoxLayout()
self.assertEqual(sys.getrefcount(self.widget1), 2)
l.addWidget(self.widget1)
self.assertEqual(sys.getrefcount(self.widget1), 3)
w = QWidget()
w.setLayout(l)
self.assertEqual(sys.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
# PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
gc.collect()
super(MultipleAdd, self).tearDown()
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testRefCount(self):
# Multiple QLayout.addWidget calls on the same widget
self.assertEqual(sys.getrefcount(self.widget), 2)
self.layout.addWidget(self.widget)
self.assertEqual(sys.getrefcount(self.widget), 3)
self.layout.addWidget(self.widget)
self.assertEqual(sys.getrefcount(self.widget), 3)
self.layout.addWidget(self.widget)
self.assertEqual(sys.getrefcount(self.widget), 3)
class InternalAdd(UsesQApplication):
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testInternalRef(self):
mw = QWidget()
w = QWidget()
ow = QWidget()
topLayout = QGridLayout()
# unique reference
self.assertEqual(sys.getrefcount(w), 2)
self.assertEqual(sys.getrefcount(ow), 2)
topLayout.addWidget(w, 0, 0)
topLayout.addWidget(ow, 1, 0)
# layout keep the referemce
self.assertEqual(sys.getrefcount(w), 3)
self.assertEqual(sys.getrefcount(ow), 3)
mainLayout = QGridLayout()
mainLayout.addLayout(topLayout, 1, 0, 1, 4)
# the same reference
self.assertEqual(sys.getrefcount(w), 3)
self.assertEqual(sys.getrefcount(ow), 3)
mw.setLayout(mainLayout)
# now trasfer the ownership to mw
self.assertEqual(sys.getrefcount(w), 3)
self.assertEqual(sys.getrefcount(ow), 3)
del mw
# remove the ref and invalidate the widget
self.assertEqual(sys.getrefcount(w), 2)
self.assertEqual(sys.getrefcount(ow), 2)
if __name__ == '__main__':
unittest.main()
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