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Diffstat (limited to 'sources/pyside2/tests/QtWidgets/qlayout_ref_test.py')
| -rw-r--r-- | sources/pyside2/tests/QtWidgets/qlayout_ref_test.py | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/sources/pyside2/tests/QtWidgets/qlayout_ref_test.py b/sources/pyside2/tests/QtWidgets/qlayout_ref_test.py new file mode 100644 index 000000000..f1a9f363f --- /dev/null +++ b/sources/pyside2/tests/QtWidgets/qlayout_ref_test.py @@ -0,0 +1,179 @@ +############################################################################# +## +## Copyright (C) 2016 The Qt Company Ltd. +## Contact: https://www.qt.io/licensing/ +## +## This file is part of the test suite of PySide2. +## +## $QT_BEGIN_LICENSE:GPL-EXCEPT$ +## 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 unittest +from sys import getrefcount + +from PySide2.QtWidgets import QHBoxLayout, QVBoxLayout, QGridLayout, QWidget +from PySide2.QtWidgets import QStackedLayout, QFormLayout +from PySide2.QtWidgets 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() |