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#############################################################################
##
## Copyright (C) 2018 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.
##
## $QT_END_LICENSE$
##
#############################################################################
import unittest
from PySide2.QtGui import QStandardItemModel
from PySide2.QtWidgets import QWidget, QTreeView, QVBoxLayout, QStyledItemDelegate
from helper import UsesQApplication
class Widget(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.treeView = QTreeView(self)
layout = QVBoxLayout()
layout.addWidget(self.treeView)
self.setLayout(layout)
self.treeView.setModel(QStandardItemModel())
self.treeView.model().setHorizontalHeaderLabels(('3', '1', '5'))
class QWidgetTest(UsesQApplication):
def testDelegates(self):
widget = Widget()
t = widget.treeView
# When calling setItemDelegateForColumn using a separate variable
# for the second argument (QAbstractItemDelegate), there was no problem
# on keeping the reference to this object, since the variable was kept
# alive (case A)
# Contrary, when instantiating this argument on the function call
# Using QStyledItemDelegate inside the call the reference of the
# object was lost, causing a segfault. (case B)
# Case A
d = QStyledItemDelegate()
# Using QStyledItemDelegate from a variable so we keep the reference alive
# and we encounter no segfault.
t.setItemDelegateForColumn(0, d)
# This raised the Segmentation Fault too, because manually destroying
# the object caused a missing refrence.
del d
# Getting the delegates
a = t.itemDelegateForColumn(0)
self.assertIsInstance(a, QStyledItemDelegate)
# Case B
t.setItemDelegateForColumn(1, QStyledItemDelegate())
# Getting the delegates
b = t.itemDelegateForColumn(1)
self.assertIsInstance(b, QStyledItemDelegate)
# Test for Rows
t.setItemDelegateForRow(0, QStyledItemDelegate())
self.assertIsInstance(t.itemDelegateForRow(0), QStyledItemDelegate)
# Test for general delegate
t.setItemDelegate(QStyledItemDelegate())
self.assertIsInstance(t.itemDelegate(), QStyledItemDelegate)
if __name__ == '__main__':
unittest.main()
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