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#!/usr/bin/env python
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
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 helper.usesqapplication import UsesQApplication
from PySide6.QtCore import QAbstractTableModel
from PySide6.QtWidgets import QTableView
class TestModel(QAbstractTableModel):
def __init__(self, parent=None):
QAbstractTableModel.__init__(self, parent)
def rowCount(self, parent):
return 0
def columnCount(self, parent):
return 0
def data(self, index, role):
return None
class KeepReferenceTest(UsesQApplication):
def testModelWithoutParent(self):
view = QTableView()
model = TestModel()
view.setModel(model)
samemodel = view.model()
self.assertEqual(model, samemodel)
def testModelWithParent(self):
view = QTableView()
model = TestModel(None)
view.setModel(model)
samemodel = view.model()
self.assertEqual(model, samemodel)
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testReferenceCounting(self):
'''Tests reference count of model object referred by view objects.'''
model1 = TestModel()
refcount1 = sys.getrefcount(model1)
view1 = QTableView()
view1.setModel(model1)
self.assertEqual(sys.getrefcount(view1.model()), refcount1 + 1)
view2 = QTableView()
view2.setModel(model1)
self.assertEqual(sys.getrefcount(view2.model()), refcount1 + 2)
model2 = TestModel()
view2.setModel(model2)
self.assertEqual(sys.getrefcount(view1.model()), refcount1 + 1)
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testReferenceCountingWhenDeletingReferrer(self):
'''Tests reference count of model object referred by deceased view object.'''
model = TestModel()
refcount1 = sys.getrefcount(model)
view = QTableView()
view.setModel(model)
self.assertEqual(sys.getrefcount(view.model()), refcount1 + 1)
del view
self.assertEqual(sys.getrefcount(model), refcount1)
def testReferreedObjectSurvivalAfterContextEnd(self):
'''Model object assigned to a view object must survive after getting out of context.'''
def createModelAndSetToView(view):
model = TestModel()
model.setObjectName('created model')
view.setModel(model)
view = QTableView()
createModelAndSetToView(view)
model = view.model()
if __name__ == '__main__':
unittest.main()
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