Combo Box calling slot without connect

teddy.ispsystem

Hello every one,

I am working on python (3.8.1) gui using PyQt5 (5.12.3). I am working on windows 10. To build my gui I used QtDesigner (on QtCreator 4.13.3) and I convert it using pyuic5. If you want to reproduce the issue I placed all the file here: https://www.transfernow.net/dl/20210429OllW9k9q

Files :

cmdExport.bat : command used to convert the .ui file
test.ui : File created with QtCreator using QtDesigner
application.py : File containing my program
test.py : File generated by the cmdExport.bat

So here is my problem :

I create a class which instantiate the gui generated by pyuic5

class application(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        # Load the design file
        super(application, self).__init__()
        # QtWidgets.QMainWindow.__init__(self, parent)
        self.ui = guiTest.Ui_MainWindow()
        self.ui.setupUi(self)
        
        self.ui.comboBox.activated.connect(self.on_comboBox_activated)
        
    def on_comboBox_activated(self, value):
        print('== Enter in on_comboBox_activated ==')
        print('value = {0}'.format(value))
        print('== Leave on_comboBox_activated ==')

The problem is when I clicked on the combo box the slot on_comboBox_activated is called 3 times. If I comment the line :

self.ui.comboBox.activated.connect(self.on_comboBox_activated)

The slot is also called but 2 times. It seems that if I call a function on_comboBox_activated on the class which instantiate the gui it will be called somewhere. To "solve" the problem I have to change the name of the function in my class like that :

class application(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        # Load the design file
        super(application, self).__init__()
        # QtWidgets.QMainWindow.__init__(self, parent)
        self.ui = guiTest.Ui_MainWindow()
        self.ui.setupUi(self)
        
        self.ui.comboBox.activated.connect(self.on_comboBox_activated1)
        
    def on_comboBox_activated1(self, value):
        print('== Enter in on_comboBox_activated ==')
        print('value = {0}'.format(value))
        print('== Leave on_comboBox_activated ==')

What did I do wrong ?

Sincerely,

jsulm

@teddy-ispsystem said in Combo Box calling slot without connect:

self.on_comboBox_activated

With this slot name you're using the auto-connect feature. Rename the slot (remove on_ prefix for example). Also: did you connect in QtDesigner already? All that would explain why it is called 3 times.

teddy.ispsystem

Oh ! I didn't know about auto-connect feature it explain everything. It's called 3 times because the slot "activated" has 2 overloading (using QString or int). If I want to filter it I have to use pyqtSlot module and add :

@pyqtSlot(str)

or

@pyqtSlot(int)

Before the slot.

Many thanks !