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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
from __future__ import annotations
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.QtGui import QStandardItemModel
from PySide6.QtWidgets import (QWidget, QTreeView, QVBoxLayout,
QStyledItemDelegate, QHeaderView)
from PySide6.QtCore import Qt
from helper.usesqapplication 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
# PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
gc.collect()
# 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)
def testHeader(self):
tree = QTreeView()
tree.setHeader(QHeaderView(Qt.Orientation.Horizontal))
self.assertIsNotNone(tree.header())
if __name__ == '__main__':
unittest.main()
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