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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
import weakref
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 QCoreApplication, QObject, Signal, SIGNAL, QProcess
from helper.usesqapplication import UsesQApplication
class Sender(QObject):
void_signal = Signal()
int_signal = Signal(int)
def __init__(self, parent=None):
super().__init__(parent)
self._delayed_int = 0
def emit_void(self):
self.void_signal.emit()
def emit_int(self, v):
self.int_signal.emit(v)
class Receiver(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
receiver = Receiver()
sender = Sender()
sender.void_signal.connect(lambda: setattr(receiver, 'called', True))
sender.emit_void()
self.assertTrue(receiver.called)
def testSimplePythonSignal(self):
# Connecting a lambda to a simple python signal witharguments
receiver = Receiver()
sender = Sender()
arg = 42
sender.int_signal.connect(lambda x: setattr(receiver, 'arg', arg))
sender.emit_int(arg)
self.assertEqual(receiver.arg, arg)
def testSimplePythonSignalNoArgsString(self):
# Connecting a lambda to a simple python signal without arguments
receiver = Receiver()
sender = Sender()
QObject.connect(sender, SIGNAL('void_signal()'),
lambda: setattr(receiver, 'called', True))
sender.emit_void()
self.assertTrue(receiver.called)
def testSimplePythonSignalString(self):
# Connecting a lambda to a simple python signal witharguments
receiver = Receiver()
sender = Sender()
arg = 42
QObject.connect(sender, SIGNAL('int_signal(int)'),
lambda x: setattr(receiver, 'arg', arg))
sender.emit_int(arg)
self.assertEqual(receiver.arg, arg)
class QtSigLambda(UsesQApplication):
qapplication = True
def testWithArgs(self):
'''Connecting a lambda to a signal with and without arguments'''
proc = QProcess()
dummy = Receiver()
proc.started.connect(lambda: setattr(dummy, 'called', True))
proc.finished.connect(lambda x: setattr(dummy, 'exit_code', x))
proc.start(sys.executable, ['-c', '""'])
self.assertTrue(proc.waitForStarted())
self.assertTrue(proc.waitForFinished())
self.assertTrue(dummy.called)
self.assertEqual(dummy.exit_code, proc.exitCode())
def testRelease(self):
"""PYSIDE-2646: Test whether main thread target slot lambda/methods
(and their captured objects) are released by the signal manager
after a while."""
def do_connect(sender):
receiver = Receiver()
sender.void_signal.connect(lambda: setattr(receiver, 'called', True))
return receiver
sender = Sender()
receiver = weakref.ref(do_connect(sender))
sender.emit_void()
self.assertTrue(receiver().called)
del sender
for i in range(3):
if not receiver():
break
QCoreApplication.processEvents()
self.assertFalse(receiver())
if __name__ == '__main__':
unittest.main()
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