QComboBox is connected to a function using following syntax:
myComboBox.activated.connect(self.myFunction )
But I need to be able to send the arguments from ComboBox to myFunction(). But if I use:
myComboBox.activated.connect(self.myFunction(myArg1, myArg2 )
I am getting
TypeError: connect() slot argument should be a callable or a signal, not 'NoneType'
What syntax needs to be used to connect a QComboBox to a function that is able to receive arguments sent from Comobobox?
Here is the code resulting an TypeError:
connect() slot argument should be a callable or a signal, not 'NoneType'
from PyQt4 import QtCore, QtGui
import sys
class MyClass(object):
def __init__(self, arg):
super(MyClass, self).__init__()
self.arg = arg
class myWindow(QtGui.QWidget):
def __init__(self, parent=None):
super(myWindow, self).__init__(parent)
self.comboBox = QtGui.QComboBox(self)
self.comboBox.addItems([str(x) for x in range(3)])
self.myObject=MyClass(id(self) )
self.comboBox.activated.connect(self.myFunction(self.myObject, 'someArg'))
def myFunction(self, arg1=None, arg2=None):
print '\n\t myFunction(): ', type(arg1),type(arg2)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
app.setApplicationName('myApp')
dialog = myWindow()
dialog.show()
sys.exit(app.exec_())
After I posted a question Stachoverflow suggested a link which explained a lot. Here is the answer:
from PyQt4 import QtCore, QtGui
class MyClass(object):
def __init__(self, arg):
super(MyClass, self).__init__()
self.arg = arg
class myWindow(QtGui.QWidget):
def __init__(self, parent=None):
super(myWindow, self).__init__(parent)
self.comboBox = QtGui.QComboBox(self)
self.comboBox.addItems([str(x) for x in range(3)])
self.myObject=MyClass(id(self) )
slotLambda = lambda: self.indexChanged_lambda(self.myObject)
self.comboBox.currentIndexChanged.connect(slotLambda)
@QtCore.pyqtSlot(str)
def indexChanged_lambda(self, string):
print 'lambda:', type(string), string
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
app.setApplicationName('myApp')
dialog = myWindow()
dialog.show()
sys.exit(app.exec_())
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