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#!/usr/bin/env python
'''Connecting lambda to signals'''
import sys
import unittest
from PySide.QtCore import QObject, SIGNAL, QProcess
try:
from PySide.QtGui import QApplication, QSpinBox, QPushButton
except ImportError:
QApplication = object
QSpinBox = object
QPushButton = object
from helper import UsesQApplication, UsesQCoreApplication
from helper import decorators
class Dummy(QObject):
def __init__(self, *args):
super(Dummy, self).__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.assert_(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.assert_(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())
@decorators.requires('PySide.QtGui')
class QtGuiSigLambda(UsesQApplication):
def testButton(self):
#Connecting a lambda to a QPushButton.clicked()
obj = QPushButton('label')
QObject.connect(obj, SIGNAL('clicked()'),
lambda: setattr(obj, 'called', True))
obj.click()
self.assert_(obj.called)
def testSpinButton(self):
#Connecting a lambda to a QPushButton.clicked()
obj = QSpinBox()
arg = 444
QObject.connect(obj, SIGNAL('valueChanged(int)'),
lambda x: setattr(obj, 'arg', 444))
obj.setValue(444)
self.assertEqual(obj.arg, arg)
if __name__ == '__main__':
unittest.main()
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