Event signal is emmitted twice every time

Question

I am working on GUI appplication. From main window I open new popup window Dialog=myDialog() (so both are now open). If i press button on that new popup window, and catch signal with this code:

class Ui_DialogCalibration(object):
def setupUi(self, DialogCalibration):
    DialogCalibration.setObjectName(_fromUtf8("DialogCalibration"))
    DialogCalibration.resize(888, 378)
    self.widget = QtGui.QWidget(DialogCalibration)
    self.widget.setGeometry(QtCore.QRect(10, 150, 641, 144))
    self.widget.setObjectName(_fromUtf8("widget"))
    self.horizontalLayout_5 = QtGui.QHBoxLayout(self.widget)
    self.horizontalLayout_5.setMargin(0)
    self.horizontalLayout_5.setObjectName(_fromUtf8("horizontalLayout_5"))
    self.radioButtonManual = QtGui.QRadioButton(self.widget)
    self.radioButtonManual.setObjectName(_fromUtf8("radioButtonManual"))
    self.horizontalLayout_5.addWidget(self.radioButtonManual)
    self.verticalLayout = QtGui.QVBoxLayout()
    self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
    self.horizontalLayout_4 = QtGui.QHBoxLayout()
    self.horizontalLayout_4.setObjectName(_fromUtf8("horizontalLayout_4"))
    self.verticalLayout_4 = QtGui.QVBoxLayout()
    self.verticalLayout_4.setObjectName(_fromUtf8("verticalLayout_4"))
    self.pushButtonDesnoX = QtGui.QPushButton(self.widget)
    self.pushButtonDesnoX.setObjectName(_fromUtf8("pushButtonDesnoX"))
    self.verticalLayout_4.addWidget(self.pushButtonDesnoX)
    self.lineEdit = QtGui.QLineEdit(self.widget)
    self.lineEdit.setText(_fromUtf8(""))
    self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
    self.verticalLayout_4.addWidget(self.lineEdit)
    self.pushButtonLijevoX = QtGui.QPushButton(self.widget)
    self.pushButtonLijevoX.setObjectName(_fromUtf8("pushButtonLijevoX"))
    self.verticalLayout_4.addWidget(self.pushButtonLijevoX)
    self.horizontalLayout_4.addLayout(self.verticalLayout_4)
    self.verticalLayout_3 = QtGui.QVBoxLayout()
    self.verticalLayout_3.setObjectName(_fromUtf8("verticalLayout_3"))
    self.pushButtonDesnoY = QtGui.QPushButton(self.widget)
    self.pushButtonDesnoY.setObjectName(_fromUtf8("pushButtonDesnoY"))
    self.verticalLayout_3.addWidget(self.pushButtonDesnoY)
    self.lineEdit_2 = QtGui.QLineEdit(self.widget)
    self.lineEdit_2.setText(_fromUtf8(""))
    self.lineEdit_2.setObjectName(_fromUtf8("lineEdit_2"))
    self.verticalLayout_3.addWidget(self.lineEdit_2)
    self.pushButtonLijevoY = QtGui.QPushButton(self.widget)
    self.pushButtonLijevoY.setObjectName(_fromUtf8("pushButtonLijevoY"))
    self.verticalLayout_3.addWidget(self.pushButtonLijevoY)
    self.horizontalLayout_4.addLayout(self.verticalLayout_3)
    self.verticalLayout_2 = QtGui.QVBoxLayout()
    self.verticalLayout_2.setObjectName(_fromUtf8("verticalLayout_2"))
    self.pushButtonDesnoZ = QtGui.QPushButton(self.widget)
    self.pushButtonDesnoZ.setObjectName(_fromUtf8("pushButtonDesnoZ"))
    self.verticalLayout_2.addWidget(self.pushButtonDesnoZ)
    self.lineEdit_3 = QtGui.QLineEdit(self.widget)
    self.lineEdit_3.setText(_fromUtf8(""))
    self.lineEdit_3.setObjectName(_fromUtf8("lineEdit_3"))
    self.verticalLayout_2.addWidget(self.lineEdit_3)
    self.pushButtoLijevoZ = QtGui.QPushButton(self.widget)
    self.pushButtoLijevoZ.setObjectName(_fromUtf8("pushButtoLijevoZ"))
    self.verticalLayout_2.addWidget(self.pushButtoLijevoZ)
    self.horizontalLayout_4.addLayout(self.verticalLayout_2)
    self.verticalLayout.addLayout(self.horizontalLayout_4)
    self.pushButtonSondaSettings = QtGui.QPushButton(self.widget)
    self.pushButtonSondaSettings.setObjectName(_fromUtf8("pushButtonSondaSettings"))
    self.verticalLayout.addWidget(self.pushButtonSondaSettings)
    self.pushButtonReset = QtGui.QPushButton(self.widget)
    self.pushButtonReset.setObjectName(_fromUtf8("pushButtonReset"))
    self.verticalLayout.addWidget(self.pushButtonReset)
    self.horizontalLayout_5.addLayout(self.verticalLayout)
    self.verticalLayout_5 = QtGui.QVBoxLayout()
    self.verticalLayout_5.setObjectName(_fromUtf8("verticalLayout_5"))
    self.labelPozition = QtGui.QLabel(self.widget)
    self.labelPozition.setObjectName(_fromUtf8("labelPozition"))
    self.verticalLayout_5.addWidget(self.labelPozition)
    self.horizontalLayout = QtGui.QHBoxLayout()
    self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
    self.labelpozitionX = QtGui.QLabel(self.widget)
    self.labelpozitionX.setObjectName(_fromUtf8("labelpozitionX"))
    self.horizontalLayout.addWidget(self.labelpozitionX)
    self.lineEditPozitionX = QtGui.QLineEdit(self.widget)
    self.lineEditPozitionX.setObjectName(_fromUtf8("lineEditPozitionX"))
    self.horizontalLayout.addWidget(self.lineEditPozitionX)
    self.verticalLayout_5.addLayout(self.horizontalLayout)
    self.horizontalLayout_2 = QtGui.QHBoxLayout()
    self.horizontalLayout_2.setObjectName(_fromUtf8("horizontalLayout_2"))
    self.labelPozitionY = QtGui.QLabel(self.widget)
    self.labelPozitionY.setObjectName(_fromUtf8("labelPozitionY"))
    self.horizontalLayout_2.addWidget(self.labelPozitionY)
    self.lineEditPozitionY = QtGui.QLineEdit(self.widget)
    self.lineEditPozitionY.setObjectName(_fromUtf8("lineEditPozitionY"))
    self.horizontalLayout_2.addWidget(self.lineEditPozitionY)
    self.verticalLayout_5.addLayout(self.horizontalLayout_2)
    self.horizontalLayout_3 = QtGui.QHBoxLayout()
    self.horizontalLayout_3.setObjectName(_fromUtf8("horizontalLayout_3"))
    self.labelPozitionZ = QtGui.QLabel(self.widget)
    self.labelPozitionZ.setObjectName(_fromUtf8("labelPozitionZ"))
    self.horizontalLayout_3.addWidget(self.labelPozitionZ)
    self.lineEditPozitionZ = QtGui.QLineEdit(self.widget)
    self.lineEditPozitionZ.setObjectName(_fromUtf8("lineEditPozitionZ"))
    self.horizontalLayout_3.addWidget(self.lineEditPozitionZ)
    self.verticalLayout_5.addLayout(self.horizontalLayout_3)
    self.horizontalLayout_5.addLayout(self.verticalLayout_5)
    self.widget1 = QtGui.QWidget(DialogCalibration)
    self.widget1.setGeometry(QtCore.QRect(20, 40, 631, 91))
    self.widget1.setObjectName(_fromUtf8("widget1"))
    self.verticalLayout_6 = QtGui.QVBoxLayout(self.widget1)
    self.verticalLayout_6.setMargin(0)
    self.verticalLayout_6.setObjectName(_fromUtf8("verticalLayout_6"))
    self.radioButtonAutomatic = QtGui.QRadioButton(self.widget1)
    self.radioButtonAutomatic.setObjectName(_fromUtf8("radioButtonAutomatic"))
    self.verticalLayout_6.addWidget(self.radioButtonAutomatic)
    self.buttonBox = QtGui.QDialogButtonBox(self.widget1)
    self.buttonBox.setOrientation(QtCore.Qt.Horizontal)
    self.buttonBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok)
    self.buttonBox.setObjectName(_fromUtf8("buttonBox"))
    self.verticalLayout_6.addWidget(self.buttonBox)
    self.labelpozitionX.setBuddy(self.lineEditPozitionX)
    self.labelPozitionY.setBuddy(self.lineEditPozitionY)
    self.labelPozitionZ.setBuddy(self.lineEditPozitionZ)
    self.radioButtonManual.toggle()
    self.buttonBox.setEnabled(False)
    self.pushButtonDesnoX.setEnabled(False)
    self.pushButtonDesnoY.setEnabled(False)
    self.pushButtonDesnoZ.setEnabled(False)
    self.pushButtonLijevoX.setEnabled(False)
    self.pushButtonLijevoY.setEnabled(False)
    self.pushButtoLijevoZ.setEnabled(False)
    self.pushButtonReset.setEnabled(False)
    self.lineEdit.setText("1")
    self.lineEdit_2.setText("1")
    self.lineEdit_3.setText("1")
    self.X=None
    self.Y=None
    self.Z=None

    self.retranslateUi(DialogCalibration)
    QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL(_fromUtf8("accepted()")), DialogCalibration.accept)
    QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL(_fromUtf8("rejected()")), DialogCalibration.reject)
    QtCore.QMetaObject.connectSlotsByName(DialogCalibration)

 class myDialog(QtGui.QDialog,Ui_DialogCalibration):
def __init__(self,sonda, parent=None):
    super(myDialog, self).__init__( parent)
    self.toupleSonda=sonda
    self.setupUi(self)
def on_pushButtonDesnoX_clicked(self):

    value=int(self.lineEdit.text())
    self.X=self.X+value
    print self.X

def retranslateUi(self, DialogCalibration):
    DialogCalibration.setWindowTitle(QtGui.QApplication.translate("DialogCalibration", "Calibration", None, QtGui.QApplication.UnicodeUTF8))
    self.radioButtonManual.setText(QtGui.QApplication.translate("DialogCalibration", "manual", None, QtGui.QApplication.UnicodeUTF8))
    self.pushButtonDesnoX.setText(QtGui.QApplication.translate("DialogCalibration", "Desno X", None, QtGui.QApplication.UnicodeUTF8))
    self.pushButtonLijevoX.setText(QtGui.QApplication.translate("DialogCalibration", "Lijevo X", None, QtGui.QApplication.UnicodeUTF8))
    self.pushButtonDesnoY.setText(QtGui.QApplication.translate("DialogCalibration", "Naprijed Y", None, QtGui.QApplication.UnicodeUTF8))
    self.pushButtonLijevoY.setText(QtGui.QApplication.translate("DialogCalibration", "Nazad Y", None, QtGui.QApplication.UnicodeUTF8))
    self.pushButtonDesnoZ.setText(QtGui.QApplication.translate("DialogCalibration", "Gore Z", None, QtGui.QApplication.UnicodeUTF8))
    self.pushButtoLijevoZ.setText(QtGui.QApplication.translate("DialogCalibration", "Dolje Z", None, QtGui.QApplication.UnicodeUTF8))
    self.pushButtonSondaSettings.setText(QtGui.QApplication.translate("DialogCalibration", "Load", None, QtGui.QApplication.UnicodeUTF8))
    self.pushButtonReset.setText(QtGui.QApplication.translate("DialogCalibration", "Reset", None, QtGui.QApplication.UnicodeUTF8))
    self.labelPozition.setText(QtGui.QApplication.translate("DialogCalibration", "Current pozition", None, QtGui.QApplication.UnicodeUTF8))
    self.labelpozitionX.setText(QtGui.QApplication.translate("DialogCalibration", "X", None, QtGui.QApplication.UnicodeUTF8))
    self.labelPozitionY.setText(QtGui.QApplication.translate("DialogCalibration", "Y", None, QtGui.QApplication.UnicodeUTF8))
    self.labelPozitionZ.setText(QtGui.QApplication.translate("DialogCalibration", "Z", None, QtGui.QApplication.UnicodeUTF8))
    self.radioButtonAutomatic.setText(QtGui.QApplication.translate("DialogCalibration", "automatic", None, QtGui.QApplication.UnicodeUTF8))

I got this oouput

1

2

So, this method has been executed twice. How can i fix this problem? Same happens on every other signal emmitted on popup window

Answer 1

Quoting from the docs:

[Connecting the both variations of the signal] also happens with signals that take optional arguments. Qt implements this using multiple signals. For example, QtGui.QAbstractButton has the following signal:

void clicked(bool checked = false);

Qt implements this as the following:

void clicked(); 
void clicked(bool checked);

The pyqtSlot() decorator can be used to specify which of the signals should be connected to the slot.

So your issue comes from the fact that clicked signal of a QPushButton has two overloads. Since Qt can connect signals to slots with less arguments, connectSlotsByName can successfully connect both overloads to your slot, thus calling the slot twice for each click.

You need to specify the appropriate overload by pyqtSlot:

@QtCore.pyqtSlot() # signal with no arguments
def on_pushButtonDesnoX_clicked(self):
    value=int(self.lineEdit.text())
    self.X=self.X+value
    print self.X