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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
'''Connecting lambda to signals'''
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.QtCore import QObject, SIGNAL, QProcess
from helper.usesqcoreapplication import UsesQCoreApplication
class Dummy(QObject):
def __init__(self, *args):
super().__init__(*args)
class BasicCase(unittest.TestCase):
def testSimplePythonSignalNoArgs(self):
# Connecting a lambda to a simple python signal without arguments
obj = Dummy()
QObject.connect(obj, SIGNAL('foo()'),
lambda: setattr(obj, 'called', True))
obj.emit(SIGNAL('foo()'))
self.assertTrue(obj.called)
def testSimplePythonSignal(self):
# Connecting a lambda to a simple python signal witharguments
obj = Dummy()
arg = 42
QObject.connect(obj, SIGNAL('foo(int)'),
lambda x: setattr(obj, 'arg', 42))
obj.emit(SIGNAL('foo(int)'), arg)
self.assertEqual(obj.arg, arg)
class QtSigLambda(UsesQCoreApplication):
qapplication = True
def testNoArgs(self):
'''Connecting a lambda to a signal without arguments'''
proc = QProcess()
dummy = Dummy()
QObject.connect(proc, SIGNAL('started()'),
lambda: setattr(dummy, 'called', True))
proc.start(sys.executable, ['-c', '""'])
proc.waitForFinished()
self.assertTrue(dummy.called)
def testWithArgs(self):
'''Connecting a lambda to a signal with arguments'''
proc = QProcess()
dummy = Dummy()
QObject.connect(proc, SIGNAL('finished(int)'),
lambda x: setattr(dummy, 'called', x))
proc.start(sys.executable, ['-c', '""'])
proc.waitForFinished()
self.assertEqual(dummy.called, proc.exitCode())
if __name__ == '__main__':
unittest.main()
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